Abstract: As a new multi-point arrangement of circulating pump, distributed variable frequency pump system has the characteristics of saving electric energy and operating cost compared with single-point arrangement of circulating pump in traditional heating pipe network. This article describes in detail, and for the system design and application should pay attention to a number of problems put forward solutions, with a view to throwing one's weight on the common ground.
Keywords: distributed frequency conversion pump design and application
First, the principle of distributed variable frequency pump system
In the traditional heating dendritic pipe network system, a set of circulating pumps are generally arranged at the heat source or the heat exchanging station, and the flow, the lift and the number of circulating pumps are selected according to the flow of the pipe network system and the resistance of the most unfavorable loop. Each end user of the pipe network system is provided with a manual regulating valve or a self-operated flow control valve and other regulating devices to consume the remaining head of the user to achieve the hydraulic balance among users in the system. Due to the heat load Changes in the capital adequacy of head pressure, increase the water supply or back pressure booster pump, but due to difficult to regulate, often upstream or downstream users have a negative impact.
With the advent of new regulating devices and controls, digital control of the water pump is made possible, so that in principle it is possible to cancel the regulating equipment in the pipe network and replace it with a speed-adjustable water pump which is set at the appropriate node of the pipe network to Meet the subsequent hydraulic conditions. If you control the network node in the appropriate pressure drop, the point called the pressure control point, the choice of the main circulation pump, as long as the flow and heat to the pressure control point resistance can be, which can greatly reduce the circulation pump Of the head, making the main loop pump motor power many; economic control point after each user set the corresponding distribution variable frequency pump to become a distributed variable frequency pump system, so that the original valve throttling energy is no longer in vain to loss, because the pump can be frequency Speed ​​governor, the main circulating pump can greatly reduce power consumption, theoretically eliminating the need for conditioning equipment, while the heating system can work at a lower pressure level, the system more secure. China Urban Heating Association has also listed the research and development of distributed variable frequency pump system as "Tenth Five-Year Plan" of science and technology.
Second, the design of distributed variable frequency pump system
In the distributed variable frequency pump system, the design should follow the following steps:
1, pipe network system design, calculation of pipe network resistance.
2, the choice of pressure control points, different pressure control points corresponding to different equipment, initial investment and pipe network operating costs, technical and economic analysis should be selected.
3, choose the main circulation pump, the choice of the main circulation pump to consider two aspects:
A: traffic requirements, should be able to provide the entire circulation network traffic;
B: lift requirements, should meet the heat source to the pressure difference between the control point pipe network resistance.
4, the choice of distribution pump, the main consideration to meet the resistance of the branch users and traffic.
Third, the realization of distributed variable frequency pump system
In accordance with the above ideas, Tangshan City Heating Corporation owned Longdong boiler room heating system has been transformed. In this paper, an example to illustrate the realization of distributed variable frequency pump system.
1, Longdong heating system consists of a 4 × 10t / h hot water boiler room and two for the station composition, the basic parameters are as follows:
(1) heating construction area:
Longnan Station: 181814.31m2
Long North Station: 139891.62m2
Total: 321705.93m2
(2) Equipment: Two main circulation pumps, one for each, ISR200-150-400, power N 90KW, flow Q 400m3 / h, head H 50m water column.
(3) Pipe Network:
1-2 diameter DN300, groove length L = 500m
2-3 diameter DN250, groove length L = 536m
3-4 diameter DN250, groove length L = 650m
According to the actual operation in recent years, take the heat supply and return water temperature 105 ℃ / 65 ℃, the boiler room resistance loss of 10m water column, resistance drag Longbei station 10m water column, Longnan internal resistance loss of 5m water column, building thermal indicators take 55kcal / m2h.
2, from the above parameters, calculated by selecting the experimental transformation program is as follows:
1 boiler main loop pump replaced by H = 24m, Q = 480m3 / h, N = 45KW variable frequency pump
2 Longnan station a water supply plus a variable frequency pump, H = 12.5m Q = 200m3 / h N = 15KW
3 Long North Station water supply plus a variable frequency pump, H = 24m Q = 240m3 / h N = 22KW
4 Longnan, Long North Station pump with the original pipe in parallel, and increase the original pipe valve.
It should be pointed out that, due to the pump parameters can not exactly exactly meet the needs of the network, the equipment selection process has varying degrees of rounding.
3, in accordance with the boiler room main pump circulating pump room to provide 1-2 points and resistance loss, the station frequency conversion pump were to overcome the 2-3,2-4 and station resistance loss principle, the company this year, after the transformation of the East Long The heating system was commissioned. In the debugging process, we are in line with the premise of meeting the heating requirements, try to balance the temperature of a return water temperature of the two thermal stations, and where possible, to maximize the distribution of variable frequency pump load, reducing the main circulating pump load , In order to save energy consumption as much as possible. Distributed inverter pump system put into operation, compared with the original single-point set circulation pump system, the measured current consumption is as follows:
System single-point circulation pump running current consumption of 130A;
Distributed variable frequency pump multi-point operation, the measured data table is as follows:
4, Distributed frequency conversion pump system before and after the main circulation pump outlet pressure dropped from 0.6Mpa to 0.39Mpa.
5, analysis
Several pump motor power factor difference is not between 0.78-0.81, without considering the difference, energy saving rate (130-56-17.1-26.8) /130×100%=23.15%
Fourth, the conclusion
Distributed variable frequency pump system is a new type of pump layout, compared with the traditional single point layout has the following advantages:
1, save energy;
2, the system as a whole lower the pressure level, the system more secure.
Five, a few experiences
1, Since the main circulation pump is generally arranged in the heat source backwater, the layout of the distribution pump (except the main circulation pump) should be in the water supply of the thermal power station or as close as possible to the water supply pipe at the economic control point.
2. It is necessary to recalculate the replenishment pressure at the replenishment point. Since it is difficult to arrange the distribution pump at the economic control point of the pipeline under normal circumstances, when the distribution pump is arranged in the station, when the branch line is longer, It is possible to cause drifting of the refill point. For such conditions, one way is to set the recharge point at the lowest point of the pipe network, or another way is still concentrated in the total heat backwater replenishment, water pressure increase the appropriate value.
3, the equipment selection, the main circulating pump technical parameters should be properly left margin.
4, the pressure control point at the differential pressure control: As the heating pipe network is far away from the signal transmission is not easy to achieve or higher cost, the calculated value converted to the main circulation pump import and export; or in the pressure control point back Water pipe installation pressure gauge, reference pressure gauge value to adjust the main circulation pump import and export of pressure.
5, In the variable frequency variable frequency pump system, because the technical parameter of the pump product is not continuous, it is impossible to meet the actual need, even if the frequency conversion adjustment can not just meet the requirements, the system of individual points of the valve adjustment is still necessary .
Keywords: distributed frequency conversion pump design and application
First, the principle of distributed variable frequency pump system
In the traditional heating dendritic pipe network system, a set of circulating pumps are generally arranged at the heat source or the heat exchanging station, and the flow, the lift and the number of circulating pumps are selected according to the flow of the pipe network system and the resistance of the most unfavorable loop. Each end user of the pipe network system is provided with a manual regulating valve or a self-operated flow control valve and other regulating devices to consume the remaining head of the user to achieve the hydraulic balance among users in the system. Due to the heat load Changes in the capital adequacy of head pressure, increase the water supply or back pressure booster pump, but due to difficult to regulate, often upstream or downstream users have a negative impact.
With the advent of new regulating devices and controls, digital control of the water pump is made possible, so that in principle it is possible to cancel the regulating equipment in the pipe network and replace it with a speed-adjustable water pump which is set at the appropriate node of the pipe network to Meet the subsequent hydraulic conditions. If you control the network node in the appropriate pressure drop, the point called the pressure control point, the choice of the main circulation pump, as long as the flow and heat to the pressure control point resistance can be, which can greatly reduce the circulation pump Of the head, making the main loop pump motor power many; economic control point after each user set the corresponding distribution variable frequency pump to become a distributed variable frequency pump system, so that the original valve throttling energy is no longer in vain to loss, because the pump can be frequency Speed ​​governor, the main circulating pump can greatly reduce power consumption, theoretically eliminating the need for conditioning equipment, while the heating system can work at a lower pressure level, the system more secure. China Urban Heating Association has also listed the research and development of distributed variable frequency pump system as "Tenth Five-Year Plan" of science and technology.
Second, the design of distributed variable frequency pump system
In the distributed variable frequency pump system, the design should follow the following steps:
1, pipe network system design, calculation of pipe network resistance.
2, the choice of pressure control points, different pressure control points corresponding to different equipment, initial investment and pipe network operating costs, technical and economic analysis should be selected.
3, choose the main circulation pump, the choice of the main circulation pump to consider two aspects:
A: traffic requirements, should be able to provide the entire circulation network traffic;
B: lift requirements, should meet the heat source to the pressure difference between the control point pipe network resistance.
4, the choice of distribution pump, the main consideration to meet the resistance of the branch users and traffic.
Third, the realization of distributed variable frequency pump system
In accordance with the above ideas, Tangshan City Heating Corporation owned Longdong boiler room heating system has been transformed. In this paper, an example to illustrate the realization of distributed variable frequency pump system.
1, Longdong heating system consists of a 4 × 10t / h hot water boiler room and two for the station composition, the basic parameters are as follows:
(1) heating construction area:
Longnan Station: 181814.31m2
Long North Station: 139891.62m2
Total: 321705.93m2
(2) Equipment: Two main circulation pumps, one for each, ISR200-150-400, power N 90KW, flow Q 400m3 / h, head H 50m water column.
(3) Pipe Network:
1-2 diameter DN300, groove length L = 500m
2-3 diameter DN250, groove length L = 536m
3-4 diameter DN250, groove length L = 650m
According to the actual operation in recent years, take the heat supply and return water temperature 105 ℃ / 65 ℃, the boiler room resistance loss of 10m water column, resistance drag Longbei station 10m water column, Longnan internal resistance loss of 5m water column, building thermal indicators take 55kcal / m2h.
2, from the above parameters, calculated by selecting the experimental transformation program is as follows:
1 boiler main loop pump replaced by H = 24m, Q = 480m3 / h, N = 45KW variable frequency pump
2 Longnan station a water supply plus a variable frequency pump, H = 12.5m Q = 200m3 / h N = 15KW
3 Long North Station water supply plus a variable frequency pump, H = 24m Q = 240m3 / h N = 22KW
4 Longnan, Long North Station pump with the original pipe in parallel, and increase the original pipe valve.
It should be pointed out that, due to the pump parameters can not exactly exactly meet the needs of the network, the equipment selection process has varying degrees of rounding.
3, in accordance with the boiler room main pump circulating pump room to provide 1-2 points and resistance loss, the station frequency conversion pump were to overcome the 2-3,2-4 and station resistance loss principle, the company this year, after the transformation of the East Long The heating system was commissioned. In the debugging process, we are in line with the premise of meeting the heating requirements, try to balance the temperature of a return water temperature of the two thermal stations, and where possible, to maximize the distribution of variable frequency pump load, reducing the main circulating pump load , In order to save energy consumption as much as possible. Distributed inverter pump system put into operation, compared with the original single-point set circulation pump system, the measured current consumption is as follows:
System single-point circulation pump running current consumption of 130A;
Distributed variable frequency pump multi-point operation, the measured data table is as follows:
4, Distributed frequency conversion pump system before and after the main circulation pump outlet pressure dropped from 0.6Mpa to 0.39Mpa.
5, analysis
Several pump motor power factor difference is not between 0.78-0.81, without considering the difference, energy saving rate (130-56-17.1-26.8) /130×100%=23.15%
Fourth, the conclusion
Distributed variable frequency pump system is a new type of pump layout, compared with the traditional single point layout has the following advantages:
1, save energy;
2, the system as a whole lower the pressure level, the system more secure.
Five, a few experiences
1, Since the main circulation pump is generally arranged in the heat source backwater, the layout of the distribution pump (except the main circulation pump) should be in the water supply of the thermal power station or as close as possible to the water supply pipe at the economic control point.
2. It is necessary to recalculate the replenishment pressure at the replenishment point. Since it is difficult to arrange the distribution pump at the economic control point of the pipeline under normal circumstances, when the distribution pump is arranged in the station, when the branch line is longer, It is possible to cause drifting of the refill point. For such conditions, one way is to set the recharge point at the lowest point of the pipe network, or another way is still concentrated in the total heat backwater replenishment, water pressure increase the appropriate value.
3, the equipment selection, the main circulating pump technical parameters should be properly left margin.
4, the pressure control point at the differential pressure control: As the heating pipe network is far away from the signal transmission is not easy to achieve or higher cost, the calculated value converted to the main circulation pump import and export; or in the pressure control point back Water pipe installation pressure gauge, reference pressure gauge value to adjust the main circulation pump import and export of pressure.
5, In the variable frequency variable frequency pump system, because the technical parameter of the pump product is not continuous, it is impossible to meet the actual need, even if the frequency conversion adjustment can not just meet the requirements, the system of individual points of the valve adjustment is still necessary .
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