CN111271699B - Heat supply network drainage system of cylinder-cut lower circulating fluidized bed cogeneration unit and control method - Google Patents
Heat supply network drainage system of cylinder-cut lower circulating fluidized bed cogeneration unit and control method Download PDFInfo
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- CN111271699B CN111271699B CN202010203854.5A CN202010203854A CN111271699B CN 111271699 B CN111271699 B CN 111271699B CN 202010203854 A CN202010203854 A CN 202010203854A CN 111271699 B CN111271699 B CN 111271699B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 141
- 238000001816 cooling Methods 0.000 claims abstract description 76
- 239000000498 cooling water Substances 0.000 claims abstract description 31
- 239000010884 boiler slag Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims description 33
- 238000001704 evaporation Methods 0.000 claims description 21
- 230000008020 evaporation Effects 0.000 claims description 21
- 238000009833 condensation Methods 0.000 claims description 14
- 230000005494 condensation Effects 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000007701 flash-distillation Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
- F22B31/0061—Constructional features of bed cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Water Supply & Treatment (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a heat supply network drainage system of a circulating fluidized bed cogeneration unit under a cut cylinder and a control method, and solves the problems of how to consider safe operation of the unit and avoid waste of heat energy under the working condition of cutting part of a low-pressure cylinder of the conventional cogeneration unit adopting a circulating fluidized bed boiler. The automatic control is realized through the distributed control system to the heat supply first station heat supply network drainage entering host computer condensate line, when the temperature of heat supply first station heat supply network drainage is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, adopt the drainage cooling heat exchanger, heat exchange the heat of heat supply first station heat supply network drainage gives heat supply network circulating water return, the heat supply network drainage after the cooling is carried in the heat supply network condenser again and flash distillation is carried out, the purpose of reducing flash steam volume is achieved, namely a certain amount of condensate water with lower temperature is guaranteed to enter the host computer steam exhaust device, the host computer condensate pump is satisfied and maintained under normal working conditions, and the cooling effect of the slag cooler of the circulating fluidized bed boiler is guaranteed.
Description
Technical Field
The invention relates to a cogeneration heat supply unit, in particular to a heat supply network drainage system of a circulating fluidized bed boiler generator unit under the working condition that a part of a low-pressure cylinder is cut off by a steam turbine in a heating period in winter and a control method thereof.
Background
The cogeneration generating and heating unit adopting the circulating fluidized bed boiler is generally operated for 4-5 months under 50% rated generating load in the heating period in winter; in order to enable the generator set to achieve the aim of low energy consumption under partial load, a power plant usually adopts an operation mode of cutting off part of a low-pressure cylinder of the generator set, and the operation condition of the generator set is called a low-pressure cylinder cutting-off condition (or a cylinder cutting condition); when the generator set operates under the working condition of cutting off the low-pressure cylinder, during the heating period, the steam extraction quantity of the generator set is increased, so that the condensate quantity entering by a main machine steam exhaust device of the generator set is obviously reduced, a condensate pump of the generator set operates under the condition of small water quantity, and the efficiency of the condensate pump is low; in addition, the boiler slag cooler in the cogeneration power generation and heat supply unit adopting the circulating fluidized bed boiler is cooled by the condensed water of the main machine, and the boiler slag cooler can meet the cooling requirement by a certain amount of low-temperature condensed water, thereby ensuring the safe operation of the boiler slag cooler; in order to solve the above requirements, the first two operation schemes are generally adopted in the field, namely, the heat supply network drainage in the heat supply first station of the cogeneration generating and heating unit is directly introduced into the host condensate pipeline of the generating unit, and the heat supply network drainage is used for supplementing the deficiency of host condensate, but as the general temperature of the heat supply network drainage of the heat supply first station is higher, the temperature of the condensate is raised too high after the heat supply network drainage directly enters the host condensate pipeline, the cooling effect of the condensate on the boiler slag cooler is greatly reduced, and the safe operation of the circulating fluidized bed boiler slag discharging system is directly threatened; the second is that the heat supply network drainage of the heat supply first station is firstly connected to the host steam exhaust device for flash evaporation so as to achieve the purpose of reducing drainage temperature, after the cooled drainage passes through the host steam exhaust device, the drainage temperature is reduced, and the defect of condensed water is also supplemented, so that the purposes of improving the flow of a condensed water pump and meeting the cooling requirement of a slag cooler are achieved, but the defect that the flash evaporation amount of steam is too large when the heat supply first station enters the host steam exhaust device for flash evaporation is overcome, and the excessive flash evaporation steam in the heat supply network condenser must be discharged to an air cooling island for cooling, so that the heat energy loss in the heat supply network drainage of the heat supply first station is caused. How to ensure the safe operation of the cogeneration unit of the circulating fluidized bed boiler and avoid the loss of heat energy of a heating system becomes a technical problem to be solved on site.
Disclosure of Invention
The invention provides a heat supply network drainage system of a circulating fluidized bed cogeneration unit under a cut cylinder and a control method, and solves the technical problems of how to consider safe operation of the unit and avoid heat energy loss under the working condition of cutting part of a low-pressure cylinder of the conventional cogeneration unit adopting a circulating fluidized bed boiler.
The invention solves the technical problems by the following technical proposal:
The general conception of the invention is that: the invention realizes the automatic control of the drainage of the heat supply first station heat supply network into the host condensation water pipeline through the distributed control system, and when the temperature of the drainage of the heat supply first station heat supply network is lower than the cooling water temperature required by the slag cooler of the circulating fluidized bed boiler, the drainage of the heat supply first station heat supply network is directly introduced into the host condensation water pipeline; when the temperature of the heat supply first station heat supply network drainage is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the heat supply first station heat supply network drainage is introduced into the drainage cooling heat exchanger, and meanwhile, the heat supply network circulating water is pumped into the heat supply network condenser for first heat exchange and heating, the water after the first heat exchange and heating is introduced into the drainage cooling heat exchanger, the heat supply first station heat supply network drainage is exchanged for the heat supply network circulating water backwater after the first heat exchange and heating, and the first station heat supply network drainage after the temperature reduction is conveyed into the heat supply network condenser for flash evaporation, so that the flash evaporation water inlet temperature of the heat supply network condenser is reduced, the purpose of reducing flash evaporation steam quantity is achieved, a certain amount of condensate water with lower temperature is ensured to enter a main machine condensate water pipeline after passing through a main machine steam exhaust device, the requirements of maintaining the main machine condensate water pump under normal working conditions are met, and the cooling water temperature of the slag cooler of the circulating fluidized bed boiler is also ensured; the heat of the heat supply network drainage of the heat supply first station is exchanged to the heat supply network circulating water backwater to carry out secondary heating on the heat supply network circulating water backwater, so that the energy is fully utilized in a heat supply system and is not wasted, the heat supply cost is reduced, and the heat and the condensed water are newly distributed in a balance way in the whole co-production heat supply unit.
A heat supply network drainage system of a circulating fluidized bed cogeneration unit under a cut cylinder comprises a heat supply network first station, a heat supply network circulating water return pipeline, a circulating fluidized bed cogeneration unit host steam exhaust device, a circulating fluidized bed cogeneration unit host condensation pipeline, a heat supply network condenser, a heat supply first station heat supply network drainage conveying pipeline, a drainage cooling heat exchanger, a distributed control system controller, a variable frequency cooling water pump, a water pressure sensor and a temperature sensor, wherein a flash evaporation spraying device and a heat supply network condenser output pipeline are respectively arranged on the heat supply network condenser, the other end of the heat supply network condenser output pipeline is communicated with the circulating fluidized bed cogeneration unit host steam exhaust device, a heat supply first station heat supply network drainage conveying pipeline is arranged in the heat supply network first station, the heat supply network circulating water return pipeline is communicated with the heat supply network first station, the heat supply head heat supply network drainage conveying pipeline is communicated with a main machine condensation pipeline of the circulating fluidized bed cogeneration unit, a first tee joint and a first electric control valve are respectively connected in series on the heat supply head heat supply network drainage conveying pipeline, a second tee joint and a third tee joint are respectively connected in series on a heat supply network circulating water return pipeline, a drainage cooling heat exchanger heat exchange cooling input water pipe is connected on a third port of the first tee joint, the other end of the drainage cooling heat exchanger heat exchange cooling input water pipe is connected with a heat exchange cooling input water port on the drainage cooling heat exchanger, a second electric control valve is arranged on the drainage cooling heat exchanger heat exchange cooling input water pipe, a heat supply network drainage cooling water pipeline is connected on a heat exchange cooling output water port on the drainage cooling heat exchanger, the other end of the heat supply network drainage cooling water pipeline is communicated with an input water port of a flash evaporation spraying device, the third port of the second tee joint is connected with a heat supply network condenser heat exchange input water pipe, the other end of the heat supply network condenser heat exchange input water pipe is communicated with the heat supply network condenser heat exchange input water pipe, the heat supply network condenser heat exchange output water pipe is connected with a heat supply network circulating backwater once heating-up back water delivery pipeline, the heat exchange heating input water port of the other end of the heat supply network circulating backwater once heating-up back water delivery pipeline is connected with a heat exchange heating output water pipe of the drainage cooling heat exchanger, the other end of the heat exchange heating output water pipe of the drainage cooling heat exchanger is connected with the third port of the third tee joint, the heat supply network condenser heat exchange input water pipe is respectively provided with a first temperature sensor and a variable frequency cooling water pump, the heat supply first station heat supply network drainage delivery pipeline is provided with a second temperature sensor, the heat supply network condenser output water pipeline is provided with a third temperature sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor, the variable frequency cooling water pump, the first electric control valve and the second electric control valve are respectively connected with the electric control system.
The water pressure sensor is arranged on the heat exchange cooling input water pipe of the drainage cooling heat exchanger, the electric control regulating valve is arranged on the water delivery pipeline after the drainage cooling of the heat supply network, and the water pressure sensor and the electric control regulating valve are respectively and electrically connected with the distributed control system controller.
A control method of a heat supply network drainage system of a cut-cylinder lower circulating fluidized bed cogeneration unit is characterized by comprising the following steps:
if the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline is lower than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the distributed control system controller controls to close the second electric control valve and open the first electric control valve, so that the heat supply first station heat supply network drainage is directly introduced into the main machine condensation water pipeline of the circulating fluidized bed cogeneration unit;
If the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the distributed control system controller controls to close a first electric control valve, opens a second electric control valve and starts a variable frequency cooling water pump, part of heat supply network circulating water backwater in the heat supply network circulating water backwater pipeline is introduced into a heat supply network condenser for first heating, then part of heat supply network circulating water backwater after the first heating is introduced into a drainage cooling heat exchanger for second heating, and part of heat supply network circulating water backwater after the second heating is converged into a heat supply network first station; meanwhile, after the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline is cooled through the drainage cooling heat exchanger, the heat supply first station heat supply network drainage after the flash evaporation cooling enters into the flash evaporation spraying device, enters into the circulating fluidized bed cogeneration unit host machine steam exhaust device through the heat supply network condenser output water pipeline, and then enters into the circulating fluidized bed cogeneration unit host machine condensation water pipeline, and the distributed control system controller adjusts and controls the electric control regulating valve through collecting the water pressure sensor signals.
If the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline is 70-80 ℃, the temperature of the heat supply network drainage after heat exchange cooling in the water conveying pipeline after heat supply network drainage cooling is 50-60 ℃, and the temperature of the output water in the heat supply network condenser output water pipeline is 30-40 ℃.
The invention has the beneficial effects that whether the heat supply first station heat supply network drainage enters the host condensation water pipeline directly is automatically controlled by the distributed control system controller, when the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the heat exchange and cooling of the heat supply first station heat supply network drainage is introduced into the drainage cooling heat exchanger, the heat supply network drainage temperature is reduced, the operation flow of the host condensation water pump is increased, the sensible heat of the heat supply network drainage is also recovered, and the operation reliability of a unit is improved while the energy utilization rate of a heat supply system is increased.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
The utility model provides a lower circulating fluidized bed cogeneration unit heat supply network drainage system of cut jar, including a heat supply network head station 26, heat supply network circulating water return pipeline 4, circulating fluidized bed cogeneration unit host computer exhaust device 10, circulating fluidized bed cogeneration unit host computer condensate line 12, heat supply network condenser 5, heat supply head station heat supply network drainage conveying pipeline 1, drainage cooling heat exchanger 2, distributed control system controller 17, variable frequency cooling water pump 16, water pressure sensor 21 and temperature sensor, be provided with flash evaporation atomizer 7 and heat supply network condenser output water pipeline 9 respectively on heat supply network condenser 5, the other end of heat supply network condenser output water pipeline 9 is in communication with circulating fluidized bed cogeneration unit host computer exhaust device 10 together, heat supply network head station heat supply network drainage conveying pipeline 1 is provided in heat supply network head station 26, heat supply network circulating water return pipeline 4 is in communication with heat supply network head station 26 together, the heat supply head station heat supply network drainage conveying pipeline 1 is communicated with a main machine condensation water pipeline 12 of the circulating fluidized bed cogeneration unit, a first tee joint 13 and a first electric control valve 11 are respectively connected in series on the heat supply head station heat supply network drainage conveying pipeline 1, a second tee joint 24 and a third tee joint 25 are respectively connected in series on a heat supply network circulating water return pipeline 4, a drainage cooling heat exchanger heat exchange cooling input water pipe 14 is connected on a third port of the first tee joint 13, the other end of the drainage cooling heat exchanger heat exchange cooling input water pipe 14 is connected with a heat exchange cooling input water port on the drainage cooling heat exchanger 2, a second electric control valve 23 is arranged on the drainage cooling heat exchanger heat exchange cooling input water pipe 14, a heat supply network drainage cooling post-cooling water conveying pipeline 8 is connected on the drainage cooling heat exchanger 2, the other end of the water delivery pipeline 8 after the heat supply network is cooled down by drainage is communicated with the water inlet of the flash evaporation spraying device 7, a third port of the second tee 24 is connected with a heat supply network condenser heat exchange water inlet pipe 15, the other end of the heat supply network condenser heat exchange water inlet pipe 15 is communicated with the heat supply network condenser heat exchange water inlet, a water delivery pipeline 6 after once heating up of heat supply network circulating backwater is connected to the heat supply network condenser heat exchange water outlet, a heat exchange water heating inlet on the water delivery pipeline 6 after once heating up of the heat supply network circulating backwater is connected with a heat exchange water heating outlet 3 of the drainage cooling heat exchanger on the water delivery pipeline 2, the other end of the heat exchange heating output water pipe 3 of the drainage cooling heat exchanger is connected with a third port of a third tee joint 25, a first temperature sensor 18 and a variable frequency cooling water pump 16 are respectively arranged on the heat exchange input water pipe 15 of the heat supply network condenser, a second temperature sensor 20 is arranged on the heat supply network drainage conveying pipeline 1 of the heat supply network head station, a third temperature sensor 19 is arranged on the heat supply network condenser output water pipeline 9, and the first temperature sensor 18, the second temperature sensor 20, the third temperature sensor 19, the variable frequency cooling water pump 16, a first electric control valve 11 and a second electric control valve 23 are respectively electrically connected with the distributed control system controller 17.
A water pressure sensor 21 is arranged on the heat exchange and cooling input water pipe 14 of the drainage cooling heat exchanger, an electric control regulating valve 22 is arranged on the water delivery pipe 8 after drainage cooling of the heat supply network, and the water pressure sensor 21 and the electric control regulating valve 22 are respectively and electrically connected with the distributed control system controller 17; the electric control regulating valve 22 in front of the heat supply network drainage spraying device controls the pressure value of the heat supply network drainage cooling pipeline to be stable to a design value, and when the pressure value is lower, the electric control regulating valve 22 is regulated to be closed; when the pressure value is higher, the electronically controlled regulator valve 22 opens.
A control method of a heat supply network drainage system of a cut-cylinder lower circulating fluidized bed cogeneration unit is characterized by comprising the following steps:
if the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline1 is lower than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the distributed control system controller 17 controls to close the second electric control valve 23 and open the first electric control valve 11, so that the heat supply first station heat supply network drainage is directly introduced into the circulating fluidized bed cogeneration unit host condensation water pipeline 12;
If the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline 1 is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the distributed control system controller 17 controls to close the first electric control valve 11, open the second electric control valve 23 and start the variable frequency cooling water pump 16, introduce part of heat supply network circulating water backwater in the heat supply network circulating water backwater pipeline 4 into the heat supply network condenser 5 for first heating, then introduce part of heat supply network circulating water backwater after first heating into the drainage cooling heat exchanger 2 for second heating, and merge part of heat supply network circulating water backwater after second heating into the heat supply network first station 26; meanwhile, after the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline 1 is cooled through the drainage cooling heat exchanger 2, the heat supply first station heat supply network drainage after the flash evaporation cooling enters into the flash evaporation spraying device 7 for flash evaporation, enters into the circulating fluidized bed cogeneration unit host machine steam exhaust device 10 through the heat supply network condenser output water pipeline 9, then enters into the circulating fluidized bed cogeneration unit host machine condensation water pipeline 12, and the distributed control system controller 17 adjusts and controls the electric control regulating valve 22 by collecting the signals of the water pressure sensor 21.
If the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline 1 is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline 1 is 70-80 ℃, the temperature of the heat supply network drainage after heat exchange cooling in the heat supply network drainage cooling water conveying pipeline 8 is 50-60 ℃, and the temperature of the output water in the heat supply network condenser output water pipeline 9 is 30-40 ℃.
Claims (3)
1. A control method of a heat supply network drainage system of a circulating fluidized bed cogeneration unit under a cut cylinder is realized by the heat supply network drainage system of the circulating fluidized bed cogeneration unit under the cut cylinder, and comprises a heat supply network head station (26), a heat supply network circulating water return pipeline (4), a circulating fluidized bed cogeneration unit host machine steam exhaust device (10), a circulating fluidized bed cogeneration unit host machine condensation pipeline (12), a heat supply network condenser (5), a heat supply head station heat supply network drainage conveying pipeline (1), a drainage cooling heat exchanger (2), a distributed control system controller (17), a variable frequency cooling water pump (16), a water pressure sensor (21) and a temperature sensor, wherein a flash evaporation spraying device (7) and a heat supply network condenser output water pipeline (9) are respectively arranged on the heat supply network condenser (5), the other end of the heat supply network condenser output water pipeline (9) is communicated with the circulating fluidized bed cogeneration unit host machine steam exhaust device (10), the heat supply network head station heat supply network conveying pipeline (1) is arranged in the heat supply network head station (26), the heat supply network circulating water return pipeline (7) is communicated with the heat supply network head station heat supply network (12) and the heat supply network (1) are communicated with each other, a first tee joint (13) and a first electric control valve (11) are respectively connected in series on a heat supply head station heat supply network drainage conveying pipeline (1), a second tee joint (24) and a third tee joint (25) are respectively connected in series on a heat supply network circulating water return pipeline (4), a drainage cooling heat exchanger heat exchange cooling input water pipe (14) is connected to a third port of the first tee joint (13), the other end of the drainage cooling heat exchanger heat exchange cooling input water pipe (14) is connected with a heat exchange cooling input water port on the drainage cooling heat exchanger (2), a second electric control valve (23) is arranged on the heat exchange cooling input water pipe (14) of the drainage cooling heat exchanger, a heat exchange cooling output water outlet on the drainage cooling heat exchanger (2) is connected with a water conveying pipeline (8) after drainage cooling of a heat network, the other end of the water conveying pipeline (8) is communicated with an input water outlet of a flash evaporation spraying device (7), a heat network condenser heat exchange input water pipe (15) is connected to a third port of the second tee joint (24), the other end of the heat exchanger heat condenser heat exchange input water pipe (15) is connected with a water conveying pipeline (6) after the water inlet of the drainage heat exchanger is connected with the water conveying pipeline (6) after the water outlet of the drainage heat exchanger is connected with the water outlet of the heat condenser, the water pipe is connected with the water outlet of the water conveying pipeline (6 after the water pipe is drained and the water is drained, a heat exchange heating output water port of the drainage cooling heat exchanger (2) is connected with a heat exchange heating output water pipe (3) of the drainage cooling heat exchanger, the other end of the heat exchange heating output water pipe (3) of the drainage cooling heat exchanger is connected with a third port of a third tee joint (25), a first temperature sensor (18) and a variable-frequency cooling water pump (16) are respectively arranged on a heat exchange input water pipe (15) of the heat supply network condenser, a second temperature sensor (20) is arranged on a heat supply network drainage conveying pipeline (1) of a heat supply head station, a third temperature sensor (19) is arranged on a heat supply network condenser output water pipeline (9), and the first temperature sensor (18), the second temperature sensor (20), the third temperature sensor (19), the variable-frequency cooling water pump (16), a first electric control valve (11) and a second electric control valve (23) are respectively and electrically connected with a distributed control system controller (17); the method is characterized by comprising the following steps of:
If the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline (1) is lower than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the distributed control system controller (17) controls to close the second electric control valve (23) and open the first electric control valve (11), so that the heat supply first station heat supply network drainage is directly introduced into the circulating fluidized bed cogeneration unit host condensation water pipeline (12);
If the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline (1) is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the distributed control system controller (17) controls to close the first electric control valve (11), open the second electric control valve (23) and start the variable frequency cooling water pump (16), introduce part of heat supply network circulating water backwater in the heat supply network circulating water return pipeline (4) into the heat supply network condenser (5) for first heating, then introduce part of heat supply network circulating water backwater after the first heating into the drainage cooling heat exchanger (2) for second heating, and merge part of heat supply network circulating water backwater after the second heating into the heat supply network first station (26); meanwhile, after the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline (1) is cooled through the drainage cooling heat exchanger (2), the heat supply first station heat supply network drainage after the flash evaporation cooling enters into the flash evaporation spraying device (7) to be subjected to flash evaporation, enters into the circulating fluidized bed cogeneration unit host machine steam exhaust device (10) through the heat supply network condenser output water pipeline (9), then enters into the circulating fluidized bed cogeneration unit host machine condensation water pipeline (12), and the distributed control system controller (17) adjusts and controls the electric control regulating valve (22) through collecting signals of the water pressure sensor (21).
2. The control method of the heat supply network drainage system of the cut-cylinder lower circulating fluidized bed cogeneration unit according to claim 1, wherein a water pressure sensor (21) is arranged on a heat exchange cooling input water pipe (14) of a drainage cooling heat exchanger, an electric control regulating valve (22) is arranged on a water supply pipeline (8) after drainage cooling of the heat supply network, and the water pressure sensor (21) and the electric control regulating valve (22) are respectively electrically connected with a distributed control system controller (17).
3. The control method of the heat supply network drainage system of the circulating fluidized bed cogeneration unit under the cut cylinder according to claim 2, wherein if the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline (1) is higher than the cooling water temperature required by the circulating fluidized bed boiler slag cooler, the temperature of the heat supply first station heat supply network drainage in the heat supply first station heat supply network drainage conveying pipeline (1) is 70-80 ℃, the temperature of the heat supply network drainage after heat exchange cooling in the heat supply network drainage cooling water conveying pipeline (8) is 50-60 ℃, and the temperature of the output water in the heat supply network condenser output water pipeline (9) is 30-40 ℃.
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