Author: Yang Jun systems Abstract: In the presence of hot commissioning and commissioning some of Anhui Coal Oil Point Unit burner management units as well as BMS Special attention, and proposed solutions.
I. INTRODUCTION The Burner Management System (BMS) is a monitoring system that modern large-scale thermal power units must have. One of their main functions is to implement furnace safety monitoring. It can work in the boiler and start and stop. Under various operating modes, a large number of parameters and conditions of the combustion system are continuously and closely monitored, logical judgments and calculations are continuously performed, and an action instruction is issued when necessary so that relevant equipment in the combustion system can be completed in accordance with established and reasonable procedures. The actions to ensure the safety of the boiler combustion system. Careful design, reasonable installation and rigorous commissioning are the three important guarantees for ensuring the high quality of the new unit's production.
He himself discussed the following issues in the design, installation and commissioning of the new 300,000 units in Anhui, for your reference.
1. Reheater protection loss (MFT)
In Xinhua's design of #3 and #4 machines in Luohe, Anhui, the design is: the turbine trip (any main valve is closed), and the high side is more than 90% within 60 seconds, otherwise the reheater protection will be lost. The MFT boiler is off. The bypass configuration is: In case of bypass (BYPASSON) (BYPASSOFF to BYPASSON), the turbine trips, high-side quick-open, when the bypass is not BYPASSON and BYPASSOFF is high Closed sideways, 3 seconds after 60 seconds.
The ultimate goal of the reheater protection loss is that when the unit is under high load, when the turbine suddenly trips, the reheater is not over-pressured, the number of safety gate actions is reduced as much as possible, energy is saved, and convenience is provided for restarting.
 As can be seen from the above design of the reheater protection in the boiler MFT item, as long as the turbine trips must be unconditionally opened whether the reheater is over or under pressure, otherwise the reheater protection is lost and the boiler is extinguished. Obviously this It is unreasonable.
 Make the following changes to this proposal:
 Loss of reheater protection: Take the reheater pressure (3 out of 2) compared with the set pressure, delay for 3 seconds with 60 seconds, reset the signal when reduced to a certain pressure:
2. For the bypass configuration: In order to meet the above design ideas to cancel the turbine side tripping high side quick opening function, instead of reheater overpressure bypass cut from BYPASSOFF to BYPASSON, high-side quick open.
3. MFT furnace negative pressure sampling sampling In many new units, the negative pressure sampling design of the furnace is three to take two, that is, one side is one and the other side is two, so according to the principle of three take two, if the furnace negative pressure Non-uniform distribution of local over-limit, then the entire furnace may not exceed the limit, but there are two sampling tube side negative pressure and the other side of the limit is not exceeded, so there will be negative pressure furnace negative signal, Causes MFT, furnace fire extinguishing. For this purpose, pressure equalization must be taken during design and installation, and the alarm and protection do not share a sampling point. The specific methods are as follows:
4. Scanning pressure is low
This design is also generally three take two, delay 5 seconds. However, some take the pressure of the mother tube of the scanning fan, and some take the differential pressure of the pressure of the mother tube of the scanning fan and the furnace pressure. I think the differential pressure is reasonable and can accurately reflect the cooling effect of the fire detection.
5. Prepare the equipment before commissioning for the furnace  For the coal-fired unit of the oil point coal, the equipment before the furnace, especially those with 220 AC control, compressed air, oil gun, lighter, oil angle valve, purge valve, fog Preparing the valve and other equipment before commissioning is particularly important. These preparatory workers do a good job in the direct aftermath of bad influences, and even in the later hot run.
 1) Check and check the power level of the oil gun, lighter, oil angle valve, purge valve, atomization valve AC220V, and for the fuel trip valve is DC110V.
2) Cleaning of compressed air a) The valve cores of oil guns, igniters, oil angle valves, purge valves, and atomizing valves are relatively small, and the air is not clean and easily blocked. Therefore, before the air compressor operates, it is necessary to The main valve of the branch pipe that closes the compressed air to the furnace is closed (there is no main valve of the branch, and the main valve of the branch is to be installed, and it is better to add a filter).
b) After the solenoid valve body is installed, seal the hole at the valve body to prevent dust and debris from falling.
c) After the wiring piping is completed, close the compressed air valve of the furnace equipment. Then, the total branch valve of the compressed air is opened, and the compressed air pipes of the oil gun, the igniter, the oil angle valve, the purge valve, and the atomization valve are detached from the valve body one by one, and the corresponding compressed air valve is opened for flushing. This basically can be done without clogging.
6. Fire detection probe installation and cooling wind preparation
Probe installation: Probes are generally classified into endoscopic and exophoria. No longer talk about the installation of out-of-sight, this article only talk about their own point of view.
 Installation: This article uses FORNEY intelligent fire detection as an example.
l) When the wind pipe and probe jacket installation and position determination: According to the instructions to determine the location of the probe and the angle fixed, welded firmly, to prevent high temperature off to the furnace, burn equipment. Be careful not to damage the duct when it is fixed.
 2) Optical fiber wear: When the air tube and probe sheath are installed, wear the fiber again. Pay attention to the force of the light to prevent damage to the optical fiber. The lens must be in place.
 Scanning and Cooling Wind Operation: The quality of the operation, especially the first firing, directly affects the safety of fire detection. Different design of the pipeline process and operation should pay special attention to avoid the fire detection surface without problems but the actual cooling effect can not be achieved.
 1) Most of the unit's scanning cooling air supply is provided by two scanning fans or by the two blower's mother tube and two scanning fans.
 Cooling air is installed in the front corners of the furnace and some manual valves are installed. Special attention should be paid to hot operation. Before the fan is turned on, the four-manhole manual valve's drain valve (without the drain valve should be installed) should be opened separately, and the welding slag and debris should be cleaned. Then the scanning cooling fan is turned on to check whether the scanning wind has reached the fire detection one by one. Probe.
I. INTRODUCTION The Burner Management System (BMS) is a monitoring system that modern large-scale thermal power units must have. One of their main functions is to implement furnace safety monitoring. It can work in the boiler and start and stop. Under various operating modes, a large number of parameters and conditions of the combustion system are continuously and closely monitored, logical judgments and calculations are continuously performed, and an action instruction is issued when necessary so that relevant equipment in the combustion system can be completed in accordance with established and reasonable procedures. The actions to ensure the safety of the boiler combustion system. Careful design, reasonable installation and rigorous commissioning are the three important guarantees for ensuring the high quality of the new unit's production.
He himself discussed the following issues in the design, installation and commissioning of the new 300,000 units in Anhui, for your reference.
1. Reheater protection loss (MFT)
In Xinhua's design of #3 and #4 machines in Luohe, Anhui, the design is: the turbine trip (any main valve is closed), and the high side is more than 90% within 60 seconds, otherwise the reheater protection will be lost. The MFT boiler is off. The bypass configuration is: In case of bypass (BYPASSON) (BYPASSOFF to BYPASSON), the turbine trips, high-side quick-open, when the bypass is not BYPASSON and BYPASSOFF is high Closed sideways, 3 seconds after 60 seconds.
The ultimate goal of the reheater protection loss is that when the unit is under high load, when the turbine suddenly trips, the reheater is not over-pressured, the number of safety gate actions is reduced as much as possible, energy is saved, and convenience is provided for restarting.
 As can be seen from the above design of the reheater protection in the boiler MFT item, as long as the turbine trips must be unconditionally opened whether the reheater is over or under pressure, otherwise the reheater protection is lost and the boiler is extinguished. Obviously this It is unreasonable.
 Make the following changes to this proposal:
 Loss of reheater protection: Take the reheater pressure (3 out of 2) compared with the set pressure, delay for 3 seconds with 60 seconds, reset the signal when reduced to a certain pressure:
3. MFT furnace negative pressure sampling sampling In many new units, the negative pressure sampling design of the furnace is three to take two, that is, one side is one and the other side is two, so according to the principle of three take two, if the furnace negative pressure Non-uniform distribution of local over-limit, then the entire furnace may not exceed the limit, but there are two sampling tube side negative pressure and the other side of the limit is not exceeded, so there will be negative pressure furnace negative signal, Causes MFT, furnace fire extinguishing. For this purpose, pressure equalization must be taken during design and installation, and the alarm and protection do not share a sampling point. The specific methods are as follows:
4. Scanning pressure is low
This design is also generally three take two, delay 5 seconds. However, some take the pressure of the mother tube of the scanning fan, and some take the differential pressure of the pressure of the mother tube of the scanning fan and the furnace pressure. I think the differential pressure is reasonable and can accurately reflect the cooling effect of the fire detection.
5. Prepare the equipment before commissioning for the furnace  For the coal-fired unit of the oil point coal, the equipment before the furnace, especially those with 220 AC control, compressed air, oil gun, lighter, oil angle valve, purge valve, fog Preparing the valve and other equipment before commissioning is particularly important. These preparatory workers do a good job in the direct aftermath of bad influences, and even in the later hot run.
 1) Check and check the power level of the oil gun, lighter, oil angle valve, purge valve, atomization valve AC220V, and for the fuel trip valve is DC110V.
2) Cleaning of compressed air a) The valve cores of oil guns, igniters, oil angle valves, purge valves, and atomizing valves are relatively small, and the air is not clean and easily blocked. Therefore, before the air compressor operates, it is necessary to The main valve of the branch pipe that closes the compressed air to the furnace is closed (there is no main valve of the branch, and the main valve of the branch is to be installed, and it is better to add a filter).
b) After the solenoid valve body is installed, seal the hole at the valve body to prevent dust and debris from falling.
c) After the wiring piping is completed, close the compressed air valve of the furnace equipment. Then, the total branch valve of the compressed air is opened, and the compressed air pipes of the oil gun, the igniter, the oil angle valve, the purge valve, and the atomization valve are detached from the valve body one by one, and the corresponding compressed air valve is opened for flushing. This basically can be done without clogging.
6. Fire detection probe installation and cooling wind preparation
Probe installation: Probes are generally classified into endoscopic and exophoria. No longer talk about the installation of out-of-sight, this article only talk about their own point of view.
 Installation: This article uses FORNEY intelligent fire detection as an example.
l) When the wind pipe and probe jacket installation and position determination: According to the instructions to determine the location of the probe and the angle fixed, welded firmly, to prevent high temperature off to the furnace, burn equipment. Be careful not to damage the duct when it is fixed.
 2) Optical fiber wear: When the air tube and probe sheath are installed, wear the fiber again. Pay attention to the force of the light to prevent damage to the optical fiber. The lens must be in place.
 Scanning and Cooling Wind Operation: The quality of the operation, especially the first firing, directly affects the safety of fire detection. Different design of the pipeline process and operation should pay special attention to avoid the fire detection surface without problems but the actual cooling effect can not be achieved.
 1) Most of the unit's scanning cooling air supply is provided by two scanning fans or by the two blower's mother tube and two scanning fans.
 Cooling air is installed in the front corners of the furnace and some manual valves are installed. Special attention should be paid to hot operation. Before the fan is turned on, the four-manhole manual valve's drain valve (without the drain valve should be installed) should be opened separately, and the welding slag and debris should be cleaned. Then the scanning cooling fan is turned on to check whether the scanning wind has reached the fire detection one by one. Probe.
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