CN112610294A - Heat supply control system capable of utilizing waste heat of small machine exhaust steam and control method thereof - Google Patents
Heat supply control system capable of utilizing waste heat of small machine exhaust steam and control method thereof Download PDFInfo
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- 239000002918 waste heat Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 137
- 238000010521 absorption reaction Methods 0.000 claims abstract description 79
- 230000001105 regulatory effect Effects 0.000 claims abstract description 51
- 238000000605 extraction Methods 0.000 claims abstract description 42
- 238000004891 communication Methods 0.000 claims description 46
- 238000010438 heat treatment Methods 0.000 claims description 45
- 230000001276 controlling effect Effects 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 10
- 230000008020 evaporation Effects 0.000 claims description 10
- 238000013461 design Methods 0.000 abstract description 11
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 230000009466 transformation Effects 0.000 description 7
- 238000009834 vaporization Methods 0.000 description 7
- 230000008016 vaporization Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 238000004080 punching Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 239000003507 refrigerant Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/003—Arrangements for measuring or testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- 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
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- 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
- F24D3/18—Hot-water central heating systems using heat pumps
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Abstract
The invention relates to a heat supply control system capable of utilizing waste heat of exhaust steam of a small machine and a control method thereof, wherein the heat supply control system comprises the following steps: the low-pressure cylinder steam inlet butterfly valve is arranged on the steam exhaust pipeline, and the steam exhaust pipeline is connected with a heat supply steam extraction pipeline; the heat supply butterfly valve is arranged on the heat supply steam extraction pipeline; the steam inlet butterfly valve of the heater is arranged on the heat supply steam extraction pipeline, and the water supply end of the heat supply network heater is connected with the water inlet end of the heat supply network through the water supply pipeline; the driving steam regulating valve is arranged on the driving steam pipeline; the steam absorption end of the absorption heat pump is connected with the small steam turbine through a steam absorption pipeline, and the condensate output end of the absorption heat pump is connected with a condensate pipeline; the DCS controller comprises an exhaust steam pressure control unit, a water supply temperature control unit, a condensed water temperature control unit and a heat supply pressure control unit. The control system ensures the balance of axial thrust between the intermediate pressure cylinder and the low pressure cylinder, so that the axial displacement of the unit is in a safe range, and the steam supply pressure of the steam-driven water-feeding pump using the steam extracted by the intermediate pressure cylinder as power does not deviate from a design value.
Description
Technical Field
The invention belongs to the technical field of small steam turbine exhaust steam utilization, and particularly relates to a heat supply control system capable of utilizing waste heat of small machine exhaust steam and a control method thereof, which are suitable for a steam turbine unit which is subjected to punching steam extraction heat supply transformation of a medium-pressure cylinder steam exhaust steam guide pipe of a condensing steam turbine, and are also suitable for a steam turbine unit provided with a small machine exhaust steam waste heat recycling system (an absorption heat pump).
Background
Along with the popularization of urban centralized heat supply, most pure condensing thermal power generating units are subjected to heat supply transformation, wherein except that a small part of units are transformed in a back pressure mode, more than 90% of the transformation adopts a mode of punching and steam extraction of a steam exhaust and guide pipe of a medium pressure cylinder for heat supply. The form of the heat supply steam extraction is as follows: the steam exhaust pipeline between the middle pressure cylinder and the low pressure cylinder is punched to extract steam, the heat supply butterfly valve is installed on the heat supply steam extraction pipeline, the low pressure cylinder steam inlet butterfly valve is installed before the exhaust steam enters the low pressure cylinder, and the two butterfly valves (the heat supply butterfly valve and the low pressure cylinder steam inlet butterfly valve) jointly control the heat supply amount.
The opening of the two butterfly valves not only influences the heat supply amount, but also greatly influences the generating capacity and safety of the unit, and if the adjustment is not good, a series of problems such as overload of two-stage blades at the end of a medium pressure cylinder, over-temperature of the blades of the medium pressure cylinder, insufficient output of a steam-driven water supply pump, imbalance of axial thrust of the unit and the like easily occur.
At present, the steam turbine set for punching, steam extraction and heat supply on the steam exhaust pipeline of the intermediate pressure cylinder adopts a manual control mode, and operators on duty manually adjust the steam turbine set according to experience and the size of load and heat supply amount of the set, so that the automation control level of the set is seriously influenced, meanwhile, the problems of misoperation and the like easily occur due to unbalanced personnel operation level, light persons influence the operation efficiency of the set, and heavy persons influence the safe operation of the set.
Along with the increase of new energy power generation year by year, the deep peak regulation frequency and the depth of the thermal generator set are gradually increased, and the importance of automatic control of a heat supply butterfly valve and a low-pressure cylinder steam inlet butterfly valve is more prominent.
In addition, when partial power plants are subjected to heat supply transformation, in order to improve the heat supply benefit of units and fully utilize the waste heat of the power plants, the waste steam heat recovery transformation of the small machine (small steam turbine) is carried out, the original waste steam of the small machine entering the condenser is introduced into the absorption heat pump, the latent heat of vaporization of the waste steam of the small machine is absorbed by the absorption heat pump to heat the circulating water of the heat supply network, the heat supply efficiency can be greatly improved through the transformation, and the waste steam waste heat of the small machine which is wasted originally is reused.
The power driving steam of the absorption heat pump also adopts a medium pressure cylinder to exhaust steam, and after the heat supply steam extraction pipeline is installed on a heat supply butterfly valve, the driving steam pressure and the steam exhaust amount of the small machine change greatly along with the increase of the load peak regulation amplitude of a power plant.
The control mode of the originally designed absorption heat pump is based on the basic stability of the driving steam pressure and the heat of the small machine exhaust steam, the temperature of the circulating water of a heat supply network is used as the regulated quantity, the design mode is difficult to meet the actual requirements on the site, if a new control mode is not adopted, the output of a steam-driven water feed pump is seriously influenced, the pressure of the small machine exhaust steam is unstable, meanwhile, the absorption heat pump is also seriously influenced, and the problems that the temperature of refrigerant is too low or the small machine exhaust steam heat cannot be completely absorbed and the like occur.
The steam extracted by the steam exhaust pipe of the intermediate pressure cylinder respectively enters the heat supply network heater and the absorption heat pump after passing through the heat supply butterfly valve, and in actual operation, the condensation capacity of the heat supply network heater is strong, so that all the extracted steam enters the heat supply network heater, the driving steam pressure of the absorption heat pump is insufficient, and the exhaust steam heat of the small machine cannot be completely absorbed.
If the power plant adopts the steam exhaust of the medium pressure cylinder, the punching, the steam extraction, the heat supply and the waste heat recovery of the small machine, how to automatically coordinate and control can ensure the stable temperature of the circulating water supply of the heat supply network and the safe operation of the unit, which is a problem to be solved urgently, and the development of the intelligent control of the heat supply unit is restricted by the problem at the same time.
Disclosure of Invention
The invention aims to provide a heat supply control system capable of utilizing waste heat of small machine exhaust steam and a control method thereof, so as to solve the problem that the existing heat supply system is unstable in control.
In order to achieve the purpose, the heat supply control system and the control method thereof capable of utilizing the waste heat of the exhaust steam of the small engine ensure the balance of axial thrust between the intermediate pressure cylinder and the low pressure cylinder, ensure that the axial displacement of the unit is within a safe range, and ensure that the steam supply pressure of the steam-driven water supply pump utilizing the steam extracted from a certain stage of the intermediate pressure cylinder as power does not deviate from a designed value.
Specifically, the technical scheme adopted by the invention is as follows:
a heating control system capable of utilizing waste heat of small machine exhaust steam comprises: the low-pressure cylinder steam inlet butterfly valve is arranged on a steam exhaust pipeline between a middle pressure cylinder of the steam turbine unit and a low-pressure cylinder of the steam turbine unit, the middle pressure cylinder is connected with the low-pressure cylinder through the steam exhaust pipeline, and a heat supply steam extraction pipeline is connected on the steam exhaust pipeline between the low-pressure cylinder steam inlet butterfly valve and the middle pressure cylinder; the heat supply butterfly valve is arranged on the heat supply steam extraction pipeline, and one end of the heat supply steam extraction pipeline, which is far away from the steam exhaust pipeline, is connected with the heat supply network heater; the heater steam inlet butterfly valve is arranged on a heat supply steam extraction pipeline close to the heat supply network heater, the water supply end of the heat supply network heater is connected with the water inlet end of the heat supply network through a water supply pipeline, and a driving steam pipeline is connected on the heat supply steam extraction pipeline between the heater steam inlet butterfly valve and the heat supply butterfly valve; the driving steam regulating valve is arranged on the driving steam pipeline, and one end of the driving steam pipeline, which is far away from the heat supply steam extraction pipeline, is connected with the power input end of the absorption heat pump; the steam absorption end of the absorption heat pump is connected with the small steam turbine through a steam absorption pipeline, and the condensate output end of the absorption heat pump is connected with a condensate pipeline; the system comprises a DCS controller, a control system and a control system, wherein the DCS controller comprises an exhaust steam pressure control unit, a water supply temperature control unit, a condensate water temperature control unit and a heat supply pressure control unit which are respectively in communication connection with the DCS controller; the steam exhaust pressure control unit is in communication connection with the steam inlet butterfly valve of the low-pressure cylinder to form regulation on the steam exhaust pressure of the intermediate-pressure cylinder; the water supply temperature control unit is in communication connection with the heat supply butterfly valve to form regulation of the water supply temperature of the heat supply network heater; the condensate temperature control unit is in communication connection with the driving steam regulating valve to regulate the exhaust steam condensate temperature of the small steam turbine in a condensate pipeline of the absorption heat pump; the heating pressure control unit is in communication connection with the heater steam inlet butterfly valve to adjust the driving steam pressure provided by the heating network heater to the absorption heat pump.
Furthermore, an exhaust steam pressure gauge in communication connection with the exhaust steam pressure control unit is arranged on an exhaust steam pipeline between the intermediate pressure cylinder and the heat supply exhaust steam pipeline.
Furthermore, a heat supply pressure gauge communicated with the heat supply pressure control unit is arranged on a heat supply steam extraction pipeline between the heater steam inlet butterfly valve and the heat supply network heater.
Furthermore, a water supply temperature meter which is in communication connection with the water supply temperature control unit is arranged on the water supply pipeline.
Furthermore, a condensed water thermometer in communication connection with the condensed water temperature control unit is arranged on the condensed water pipeline; and a condensate control valve in communication connection with the DCS controller is arranged on the condensate pipeline.
Furthermore, a steam suction control valve in communication connection with the DCS controller is arranged on the steam suction pipeline; and a condensing pipeline is connected to the steam suction pipeline between the steam suction control valve and the small turbine, one end of the condensing pipeline, which is far away from the steam suction pipeline, is connected with a condenser, and a condensing control valve in communication connection with the DCS controller is arranged on the condensing pipeline.
Furthermore, a water return end of the heat supply pipe network is connected with a heat supply network heater through a heat supply network water return pipeline, and a heat supply network water return control valve in communication connection with the DCS controller is arranged on the heat supply network water return pipeline; the water return end of the heat supply pipe network is connected with the water return end of the absorption heat pump through a heat pump water return pipeline, and a heat pump water return control valve which is in communication connection with a DCS controller is arranged on the heat pump water return pipeline; the heat outlet end of the absorption heat pump is connected with a heat supply network water return pipeline through a heat outlet pipeline, and a heat outlet control valve in communication connection with the DCS controller is arranged on the heat outlet pipeline.
Meanwhile, the invention also provides a heat supply control method of the heat supply control system capable of utilizing the waste heat of the small machine exhaust steam, which comprises the following steps:
regulating and controlling the steam inlet butterfly valve of the low-pressure cylinder:
acquiring steam turbine set evaporation quantity parameters and medium pressure cylinder exhaust steam pressure parameters before a low-pressure cylinder steam inlet butterfly valve and a heat supply butterfly valve are additionally installed, drawing a relation curve of the set evaporation quantity and the medium pressure cylinder exhaust steam pressure, and taking the medium pressure cylinder exhaust steam pressure value in the relation curve as a standard value P1Sign boardThe exhaust pressure value of the intermediate pressure cylinder after the low pressure cylinder steam inlet butterfly valve and the heat supply butterfly valve are additionally arranged is an actual value P1, and P1 and P1 are set in the DCS controllerSign boardThe deviation value is +/-0.05 MPa, the DCS controller sends the set control logic to the steam exhaust pressure control unit, the steam exhaust pressure control unit controls the steam inlet butterfly valve of the low-pressure cylinder, and the P1 is regulated and controlled within the deviation value range to realize the automatic regulation of the steam exhaust pressure of the medium-pressure cylinder;
regulating and controlling a heat supply butterfly valve:
obtaining a standard value T1 of the water supply temperature of the heat supply network required under the current weather environment temperatureSign boardAnd according to T1Sign boardCalculating the heating pressure standard value P2 of the corresponding heating network heaterSign boardThe actual value of the heating pressure of the heating network heater is P2, and P2 and P2 are set in the DCS controllerSign boardThe deviation value is +/-0.05 MPa, and the DCS controller sends the set control logic to the water supply temperature control unit to realize the adjustment of the actual value T1 of the water supply temperature of the heat supply network heater;
regulating and driving the steam regulating valve:
calculating the exhaust steam pressure correspondence of the small steam turbineThe saturation temperature of (2) is set as a standard value T2 of the condensation water temperatureSign boardThe actual value of the steam exhaust condensate temperature of the small turbine in the condensate pipeline of the absorption heat pump is T2, and T2 and T2 are set in a DCS controllerSign boardThe deviation value is control logic of +/-5 ℃, and the DCS controller sends the set control logic to the condensate temperature control unit to realize the adjustment of the exhaust steam condensate temperature of the small steam turbine in the condensate pipeline of the absorption heat pump;
regulating and controlling a heater steam inlet butterfly valve:
according to the performance of the absorption heat pump, the lowest driving steam pressure required by the absorption heat pump to absorb the exhaust steam of the small steam turbine is calculated, and the lowest driving steam pressure is taken as a standard value P3Sign boardThe actual value of the driving steam pressure is P3, the P2 comprises P3, and P3 and P3 are set in the DCS controllerSign boardThe deviation value is +/-0.05 MPa, and the DCS controller sends the set control logic to the heat supply pressure control unit to adjust the steam inlet butterfly valve of the heater, so that the adjustment of the driving steam pressure provided by the heat supply network heater to the absorption heat pump is realized.
The invention has the beneficial effects that:
the existing heat supply mode is improved, a low-pressure cylinder steam inlet butterfly valve is additionally arranged on a steam exhaust pipeline of an intermediate pressure cylinder and a low-pressure cylinder, a heat supply steam extraction pipeline is additionally arranged on the steam exhaust pipeline to form connection between the intermediate pressure cylinder and a heating network heater, a heat supply butterfly valve and a heater steam inlet butterfly valve are sequentially additionally arranged on the heat supply steam extraction pipeline, a driving steam regulating valve is additionally arranged on a driving steam pipeline between the heating network heater and an absorption heat pump, and exhaust steam of a small steam turbine is absorbed through the absorption heat pump;
the low-pressure cylinder steam inlet butterfly valve is in communication connection with the steam exhaust pressure control unit in the DCS controller, so that the opening and closing degree of the low-pressure cylinder steam inlet butterfly valve can be automatically regulated, and the steam exhaust pressure P1 of the intermediate pressure cylinder does not deviate from the standard steam exhaust pressure value P1 of the intermediate pressure cylinder before modification corresponding to the evaporation capacity of the current unitSign boardThe balance of axial thrust between the high and medium pressure cylinders and the low pressure cylinder is ensured, so that the axial displacement of the unit is in a safe range;
supply in heat supply butterfly valve and DCS controllerThe water temperature control unit is in communication connection, so that the opening and closing degree of the heat supply butterfly valve is automatically regulated and controlled, and the steam supply pressure P2 of the heat supply network heater is ensured not to deviate from the heat supply pressure standard value P2 of the heat supply network heaterSign boardFurther ensuring that the actual value T1 of the temperature of the water supplied to the heat supply network of the heat supply network heater is stabilized within a required numerical range;
the driving steam regulating valve is in communication connection with a condensate temperature control unit in the DCS controller, automatic regulation and control of the opening and closing degree of the driving steam regulating valve are achieved, the driving steam quantity entering the absorption heat pump is controlled through the heat pump driving steam regulating valve, and therefore the fact that the actual value T2 of the exhaust steam condensate temperature of the small steam turbine is close to the standard value T2 of the condensate temperature is guaranteedSign boardTherefore, the absorption heat pump can ensure that the waste steam latent heat of vaporization of the small steam turbine is fully absorbed, and meanwhile, the absorption heat pump does not continuously absorb the physical sensible heat of the waste steam condensate of the small steam turbine, so that the problem that the condensate temperature is too low or even freezes due to the fact that the original designed driving steam regulating valve tracks the water supply temperature of a heat supply network is avoided;
the heater steam inlet butterfly valve is in communication connection with a heat supply pressure control unit in the DCS controller, automatic regulation and control of the opening and closing degree of the heater steam inlet butterfly valve are achieved, heat supply steam extraction can be guaranteed not to completely enter a heat supply network heater due to strong condensation capacity of the heat supply network heater, and therefore insufficient driving steam pressure of a heat pump is caused, and according to the performance and actual operation experience of the absorption heat pump, the lowest driving steam pressure P3 needed by the absorption heat pump is obtainedSign boardThe steam inlet butterfly valve of the heater is automatically controlled to ensure that the driving steam pressure P3 is not lower than P3Sign boardFurther, the waste heat of the exhaust steam of the small steam turbine can be fully absorbed;
through a series of automatic control, thermal generator set who has guaranteed that the exhaust steam pipeline through the intermediate pressure jar is through drawing steam heat supply transformation, has carried out little steam turbine exhaust steam waste heat recovery simultaneously and has reformed transform can the automatic tracking heat supply network water supply temperature to can fully absorb little machine exhaust steam waste heat, guarantee unit heat supply benefit maximize, guarantee the unit at degree of depth peak regulation variable load in-process, still can satisfy the heat supply network water supply temperature requirement, avoided the undulant problem of parameter that the manual regulation of the person on duty of power plant brought, reduced person on duty's intensity of labour.
Drawings
Fig. 1 is a schematic structural diagram of a heating control system capable of utilizing waste heat of exhaust steam of a small engine according to embodiment 1 of the present invention;
fig. 2 is a schematic control relationship diagram of a heat supply control system capable of utilizing waste heat of exhaust steam of a small engine according to embodiment 1 of the present invention;
wherein, 1, a low-pressure cylinder steam inlet butterfly valve;
2. a heat supply butterfly valve;
3. a steam inlet butterfly valve of the heater;
4. driving a steam regulating valve;
10. a steam exhaust duct;
20. heat supply steam extraction pipeline
30. A water supply pipeline;
40. driving the steam pipeline;
50. a steam suction pipeline 51, a steam suction control valve 52, a steam condensation pipeline 53 and a steam condensation control valve;
60. a condensate pipeline 61 and a condensate control valve;
70. a heat supply network return water pipeline 71 and a heat supply network return water control valve;
80. a heat pump return water pipe 81 and a heat pump return water control valve;
90. a heat outlet pipeline 91 and a heat outlet control valve;
101. the system comprises an intermediate pressure cylinder 102, a low pressure cylinder 103, a heating network heater 104, an absorption heat pump 105, a small steam turbine 106 and a condenser;
200. DCS controller, 210, steam exhaust pressure control unit, 211, steam exhaust pressure gauge, 220, water supply temperature control unit, 221, water supply temperature scale, 230, condensate temperature control unit, 231, condensate temperature gauge, 240, heat supply pressure control unit, 241 and heat supply pressure gauge.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical significance. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship may be made without substantial technical changes.
Example 1
Referring to fig. 1-2, the heat supply control system capable of utilizing the waste heat of the exhaust steam of the small engine provided by the invention comprises: the low-pressure cylinder steam inlet butterfly valve 1 is arranged on a steam exhaust pipeline 10 between an intermediate pressure cylinder 101 of the steam turbine set and a low-pressure cylinder 102 of the steam turbine set, the intermediate pressure cylinder 101 is connected with the low-pressure cylinder 102 through the steam exhaust pipeline 10, and a heat supply steam extraction pipeline 20 is connected to the steam exhaust pipeline 10 between the low-pressure cylinder steam inlet butterfly valve 1 and the intermediate pressure cylinder 101; the heat supply butterfly valve 2 is arranged on the heat supply steam extraction pipeline 20, and one end of the heat supply steam extraction pipeline 20, which is far away from the steam exhaust pipeline 10, is connected with the heat supply network heater 103; the heater steam inlet butterfly valve 3 is arranged on a heat supply steam extraction pipeline 20 close to the heat supply network heater 103, the water supply end of the heat supply network heater 103 is connected with the water inlet end of a heat supply network (not shown) through a water supply pipeline 30, and a driving steam pipeline 40 is connected on the heat supply steam extraction pipeline 20 between the heater steam inlet butterfly valve 3 and the heat supply butterfly valve 2; the driving steam regulating valve 4 is arranged on the driving steam pipeline 40, and one end of the driving steam pipeline 40, which is far away from the heat supply steam extraction pipeline 20, is connected with the power input end of the absorption heat pump 104; the steam absorption end of the absorption heat pump 104 is connected with the small steam turbine 105 through a steam absorption pipeline 50, and the condensate output end of the absorption heat pump 104 is connected with a condensate pipeline 60; the system comprises a DCS controller 200, wherein the DCS controller 200 comprises a steam exhaust pressure control unit 210, a water supply temperature control unit 220, a condensed water temperature control unit 230 and a heat supply pressure control unit 240 which are respectively in communication connection with the DCS controller 200; the exhaust steam pressure control unit 210 is in communication connection with the low-pressure cylinder steam inlet butterfly valve 1 to adjust the exhaust steam pressure of the intermediate pressure cylinder; the water supply temperature control unit 220 is in communication connection with the heat supply butterfly valve 2 to adjust the water supply temperature of the heat supply network heater 103; the condensed water temperature control unit 230 is in communication connection with the driving steam regulating valve 4 to regulate the temperature of the exhaust steam condensed water of the small steam turbine in the condensed water pipeline 60 of the absorption heat pump 104; the heating pressure control unit 240 is in communication connection with the heater steam inlet butterfly valve 3 to form regulation of the driving steam pressure provided by the heat supply network heater 103 to the absorption heat pump 104.
Further, an exhaust pressure gauge 211 is disposed on the exhaust pipe 10 between the intermediate pressure cylinder 101 and the heat supply exhaust pipe 20, and is in communication connection with the exhaust pressure control unit 210.
The design of the steam exhaust pressure gauge 211 can monitor the steam exhaust pressure of the medium pressure cylinder in real time, and improve the accuracy of the steam exhaust pressure control unit 210 for regulating and controlling the steam inlet butterfly valve 1 of the low pressure cylinder.
Further, a heat supply pressure gauge 241 which is in communication connection with the heat supply pressure control unit 240 is arranged on the heat supply steam extraction pipeline 20 between the heater steam inlet butterfly valve 3 and the heat supply network heater 103.
The design of the heat supply pressure gauge 241 can monitor the heat supply pressure of the heat supply network heater 103, and improve the accuracy of the heat supply pressure control unit 240 for regulating and controlling the steam inlet butterfly valve 3 of the heater.
Further, a water supply temperature meter 221 connected to the water supply temperature control unit 220 in communication is disposed on the water supply pipeline 30.
The design of the water supply temperature meter 221 can monitor the water supply temperature of the heating network heater 103, and the accuracy of the water supply temperature control unit 220 for regulating and controlling the heat supply butterfly valve 2 is improved by combining the monitoring of the heat supply pressure gauge 241 for the heat supply pressure.
Further, a condensed water temperature meter 231 in communication connection with the condensed water temperature control unit 230 is arranged on the condensed water pipeline 60; and a condensate control valve 61 which is in communication connection with the DCS controller 200 is arranged on the condensate pipeline 60.
The condensate temperature meter 231 is designed to monitor the exhaust steam condensate temperature of the small steam turbine in the condensate pipeline 60 of the absorption heat pump 104, and the accuracy of the condensate temperature control unit 230 in controlling the driving steam regulating valve 4 can be effectively improved by combining the control of the condensate control valve 61.
Further, a steam suction control valve 51 in communication connection with the DCS controller 200 is arranged on the steam suction pipeline 50; a condensing pipeline 52 is connected to the steam-absorbing pipeline 50 between the steam-absorbing control valve 51 and the small turbine 105, a condenser 106 is connected to one end of the condensing pipeline 52 far away from the steam-absorbing pipeline 50, and a condensing control valve 53 in communication connection with the DCS controller 200 is arranged on the condensing pipeline 52.
The condenser 106 and the absorption heat pump 104 are designed in a matching way, the small turbine exhaust steam which enters the condenser 106 originally is introduced into the absorption heat pump 104, the absorption heat pump 104 is used for absorbing the vaporization latent heat of the small turbine exhaust steam to heat the circulating water in the heat supply network heater 103, the heat supply efficiency can be greatly improved through modification, and the waste heat of the small turbine exhaust steam which is wasted originally is reused.
Meanwhile, the invention also provides a heat supply control method of the heat supply control system capable of utilizing the waste heat of the small machine exhaust steam, which comprises the following steps:
regulating and controlling the steam inlet butterfly valve of the low-pressure cylinder:
acquiring the steam turbine set evaporation capacity parameter and the intermediate pressure cylinder steam exhaust pressure parameter before the low-pressure cylinder steam inlet butterfly valve 1 and the heat supply butterfly valve 2 are installed, drawing a relation curve of the set evaporation capacity and the intermediate pressure cylinder steam exhaust pressure, and taking the intermediate pressure cylinder steam exhaust pressure value in the relation curve as a standard value P1Sign boardThe exhaust pressure value of the intermediate pressure cylinder after the low pressure cylinder steam inlet butterfly valve and the heat supply butterfly valve are additionally arranged is an actual value P1, and P1 and P1 are set in the DCS controller 200Sign boardThe deviation amount between the two is +/-0.05 MPa, the DCS controller sends the set control logic to the steam exhaust pressure control unit 210, the steam exhaust pressure control unit 210 controls the low-pressure cylinder steam inlet butterfly valve 1, and the P1 is regulated and controlled within the deviation amount range to realize the steam exhaust of the medium-pressure cylinderAutomatic adjustment of pressure;
specifically, after a steam exhaust pipeline 10 between an intermediate pressure cylinder 101 and a low pressure cylinder 102 is punched and additionally provided with a heat supply steam extraction pipeline 20 for extracting steam and supplying heat to a heat network heater 103, the balance of axial thrust among the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder of the steam turbine unit is inevitably influenced, the axial displacement of the unit is increased, and the safety of the unit is dangerous; meanwhile, the steam supply source of the small turbine 105 driving the steam feed water pump is connected to a certain level of the intermediate pressure cylinder 101, and the problem of unstable water feed flow and the like caused by insufficient steam supply pressure of the small turbine 105 after heat supply and steam extraction is inevitably caused. Because the low-pressure cylinders 102 are symmetrically arranged, in order to ensure that the axial thrust of the whole steam turbine set is balanced after heat supply and steam extraction, the steam exhaust pressure of the intermediate pressure cylinder 101 is required to be ensured not to deviate from the corresponding steam exhaust pressure of the intermediate pressure cylinder before modification under the current set evaporation capacity, and thus, the steam supply pressure of the small steam turbine 105 which adopts certain stage of steam extraction of the intermediate pressure cylinder as power is ensured not to deviate from a design value;
based on the theoretical analysis, firstly, according to the parameters of the unit before heat supply modification (the heat supply modification is to install the heat supply steam extraction pipeline 20 on the steam exhaust pipeline 10, install the low-pressure cylinder steam inlet butterfly valve 1 on the steam exhaust pipeline 10, install the heat supply butterfly valve 2 on the heat supply steam extraction pipeline 20), drawing a relation curve between the evaporation capacity of the unit and the exhaust pressure of the intermediate pressure cylinder, and taking the exhaust pressure of the intermediate pressure cylinder as the standard value P1 of closed-loop controlSign board(setting amount), setting P1 and P1 with the actual value P1 of the exhaust pressure of the pressure cylinder in the machine set as the regulated amount of closed-loop controlSign boardThe deviation amount between the two control logics is +/-0.05 MPa, the closed-loop control logic is arranged on the steam exhaust pressure control unit 210 through the DCS controller 200, the low-pressure cylinder steam inlet butterfly valve 1 is automatically regulated and controlled, and the actual value P1 of the steam exhaust pressure of the intermediate pressure cylinder is controlled not to deviate from P1Sign boardTherefore, the balance of the axial thrust of the unit can be ensured;
taking a certain 320MW supercritical steam turbine unit as an example, the exhaust steam pressure P1 of the intermediate pressure cylinder is converted from the evaporation capacity of the unit, and the corresponding data of the specific conversion relation curve is as follows:
regulating and controlling a heat supply butterfly valve;
obtaining a standard value T1 of the water supply temperature of the heat supply network required under the current weather environment temperatureSign boardAnd according to T1Sign boardCalculating the heating pressure standard value P2 of the corresponding heating network heater 103Sign boardThe actual value of the heating pressure of the heating network heater 103 is P2, and P2 and P2 are set in the DCS controller 200Sign boardThe deviation amount between the actual values is +/-0.05 MPa, and the DCS controller 200 sends the set control logic to the water supply temperature control unit 220 to adjust the actual value T1 of the heat supply network water supply temperature of the heat supply network heater 103;
specifically, the purpose of installing the heat supply butterfly valve 2 is to control the water supply temperature of the heat supply network at the outlet of the heat supply network heater 103 to meet the requirement of centralized heat supply, and in the actual operation, the water supply temperature of the heat supply network at the outlet of the heat supply network heater 103 has large variation, if the water supply temperature of the heat supply network is directly tracked by using the heat supply butterfly valve 2, frequent fluctuation of the heat supply butterfly valve 2 is inevitably caused, so that a parameter which can control the water supply temperature of the heat supply network in advance and has relatively small variation amplitude is required to be searched for the heat supply butterfly valve 2;
according to the design principle of the heat supply network heater, the difference value between the saturation temperature corresponding to the steam pressure entering the heat supply network heater 103 and the water temperature at the water supply end of the heat supply network heater 103 is a fixed value, called as the upper end difference of the heater, and the water supply temperature of the heat supply network can be adjusted by controlling the heat supply steam pressure entering the heat supply network heater 103;
based on the theoretical analysis, firstly, a standard value T1 of the water supply temperature of the heat supply network required under the current weather environment temperature is givenSign boardCalculating the heating pressure standard value P2 of the corresponding heating network heaterSign boardThe standard value P2 is usedSign boardThe actual heating pressure P2 of the heating network heater 103 is set as the set value of the closed-loop control, and the set values of P2 and P2 are set as the regulated value of the closed-loop controlSign boardThe deviation amount is +/-0.05 MPa, the closed-loop control logic is arranged on the water supply temperature control unit 220 through the DCS controller 200, the heat supply butterfly valve 2 is automatically regulated and controlled, and the heat supply pressure P2 of the heat supply network heater 103 is controlled not to deviate from the standard value P2Sign boardThis ensures the stability of the net supply water temperature actual value T1 at the supply end of the net heater 103.
Taking a certain northern city for centralized heat supply as an example, the difference of the upper end of the design of a heat supply network heater is 5 ℃, and the outdoor weather environment temperature, the water supply temperature of the heat supply network and the heat supply pressure P of the heat supply network heater corresponding to the outdoor weather environment temperature are as follows:
regulating and driving the steam regulating valve:
calculating a saturation temperature corresponding to the exhaust steam pressure of the small steam turbine 105, and using the saturation temperature as a standard value T2 of the condensate temperatureSign boardThe actual value of the condensing water temperature of the exhaust steam of the small turbine in the condensing water pipe 60 of the absorption heat pump 104 is T2, and T2 and T2 are set in the DCS controller 200Sign boardThe deviation amount between the steam turbine and the steam turbine is control logic of +/-5 ℃, and the DCS controller 200 sends the set control logic to the condensate temperature control unit 230 to adjust the condensate temperature of the exhaust steam of the small steam turbine in the condensate pipeline 60 of the absorption heat pump 104;
specifically, the originally designed driving steam regulating valve takes the return water temperature of the heat supply network heated by the absorption heat pump as a control target without considering the exhaust steam pressure and the exhaust steam condensate temperature of the small steam turbine, and the design inevitably causes the problem of large fluctuation of the exhaust steam pressure of the small turbine in the control process, so that the unstable output of the steam-driven water feed pump driven by the small turbine is caused, and the potential safety hazard is brought to the stable operation of a unit. When the return water temperature of a heat supply network heated by a heat pump is deliberately pursued, when the exhaust steam quantity of a small machine is insufficient, the heat pump can excessively absorb the exhaust steam quantity of the small machine, and the physical sensible heat of condensate water is continuously absorbed after the latent heat of vaporization of the exhaust steam is absorbed, so that the temperature of the exhaust steam condensate water is too low, and even the problem of freezing is caused. The absorption heat pump is installed for comprehensively absorbing the latent heat of vaporization of the exhaust steam of the small engine, so long as the purpose is achieved, the design condition is met, the requirement on the rising of the water temperature of the absorption heat pump is not needed, and finally, the accurate control of the water supply temperature of the heat supply network is completed by the matching of a low-pressure cylinder steam inlet butterfly valve and a heat supply butterfly valve;
based on the above theoretical analysis, the saturation temperature corresponding to the steam exhaust pressure of the current small steam turbine 105 is first calculated, and this saturation temperature is used as the set value of the closed-loop control (the standard value T2 of the condensate temperature)Sign board) Setting the exhaust steam condensate temperature T2 of the small turbine in the condensate pipeline 60 of the absorption heat pump 104 as the regulated amount of closed-loop control, and setting T2 and T2Sign boardThe deviation amount is +/-5 ℃, the closed-loop control logic is arranged on a condensate temperature control unit 230 through a DCS controller 200, a driving steam regulating valve 4 is automatically regulated and controlled, and the condensate temperature T2 of the exhaust steam of the small steam turbine is regulated not to deviate from a standard value T2Sign boardTherefore, the latent heat of the exhaust steam vaporization of the small steam turbine 105 can be fully absorbed, and the absorption heat pump 104 can not continuously absorb the physical sensible heat of the exhaust steam condensate.
Taking a small turbine 105 matched with a 320MW supercritical steam turbine unit as an example, when the exhaust steam pressure of the small turbine 105 is 7.45KPa, the corresponding saturation temperature is 40 ℃ (namely the standard value T2 of the condensate temperature) through the steam saturation parameter tableSign board) The driving steam regulating valve 4 which is put into the absorption heat pump 103 automatically regulates and controls the temperature T2 of the exhaust steam condensate of the small steam turbine to be 40 ℃, so that the exhaust steam waste heat of the small steam turbine 105 is fully utilized and is not excessively cooled by heat absorption.
Regulating and controlling a heater steam inlet butterfly valve:
calculating the lowest driving steam pressure required by the absorption heat pump 104 to absorb the dead steam of the small steam turbine 105 according to the performance of the absorption heat pump 104, and taking the lowest driving steam pressure as a standard value P3Sign boardThe actual value of the driving steam pressure is P3, the P2 bagIncluding P3, setting P3 and P3 in DCS controller 200Sign boardThe deviation amount between the heating network heater and the absorption heat pump 104 is +/-0.05 MPa, the DCS controller 200 sends the set control logic to the heating pressure control unit 240, and adjusts the steam inlet butterfly valve 3 of the heater, so as to adjust the driving steam pressure provided by the heating network heater 103 to the absorption heat pump 104.
Specifically, the extracted steam of the intermediate pressure cylinder passes through the heat supply butterfly valve 2 and then respectively enters the absorption heat pump 104 and the heat supply network heater 103, and the steam extracted by the intermediate pressure cylinder is difficult to enter the absorption heat pump 104 due to the relatively strong condensation effect of the heat supply network heater 103, so that the power-driving steam pressure of the absorption heat pump 104 is insufficient, the latent heat of the exhaust steam vaporization of the small steam turbine 105 cannot be completely absorbed, and the exhaust steam pressure fluctuation of the small steam turbine 105 is caused;
based on the above theoretical analysis, first, the minimum driving steam pressure required for absorbing the exhaust steam heat of the small steam turbine 105 is calculated according to the performance and actual operation experience of the absorption heat pump 104, and the pressure is used as the set value (standard value P3) of the closed-loop controlSign board) Setting P3 and P3 with the actual drive steam pressure P3 as the regulated amount of closed-loop controlSign boardThe deviation amount is +/-0.05 MPa, the closed-loop control is downloaded to a heat supply pressure control unit 240 through a DCS controller 200, and the steam inlet butterfly valve 3 of the heater is automatically regulated and controlled when P3 is larger than P3Sign boardWhen the steam inlet butterfly valve 3 of the heater is fully opened, and when P3 is lower than P3Sign boardWhen in use, the steam inlet butterfly valve 3 of the heater is closed down to ensure that the driving steam pressure meets the requirement.
Taking a small machine exhaust steam recycling heat pump system corresponding to a certain 320MW supercritical unit as an example, the required minimum driving steam pressure is 0.1MPa, and the pressure is taken as P3Sign boardAnd when the actual driving steam pressure is lower than 0.1MPa, closing the heater steam inlet butterfly valve 3, and holding the steam to the driving steam regulating valve 4 so as to ensure that the driving steam pressure meets the requirement.
Example 2
Furthermore, the water return end of the heat supply pipe network is connected with the heat supply network heater 103 through a heat supply network water return pipe 70, and the heat supply network water return pipe 70 is provided with a heat supply network water return control valve 71 which is in communication connection with the DCS controller 200; the water return end of the heat supply pipe network is connected with the water return end of the absorption heat pump 104 through a heat pump water return pipeline 80, and a heat pump water return control valve 81 in communication connection with the DCS controller 200 is arranged on the heat pump water return pipeline 80; the heat outlet end of the absorption heat pump 104 is connected with the heat supply network water return pipeline 70 through a heat outlet pipeline 90, and a heat outlet control valve 91 in communication connection with the DCS controller 200 is arranged on the heat outlet pipeline 90.
The matching design of the heat supply network return water control valve 71 and the heat pump return water control valve 81 can enable the return water of the heat supply network to be utilized by the heat supply network heater 103 and the absorption heat pump 104, so that water resources are saved, and the utilization rate is improved.
The rest is the same as example 1.
Although the present invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the invention or a functional block may be deleted. Accordingly, such modifications or improvements or omissions may be made without departing from the spirit of the invention and within the scope of the appended claims.
Claims (8)
1. A heat supply control system capable of utilizing waste heat of small machine exhaust steam is characterized by comprising:
the low-pressure cylinder steam inlet butterfly valve (1) is arranged on a steam exhaust pipeline (10) between a middle-pressure cylinder (101) of the steam turbine set and a low-pressure cylinder (102) of the steam turbine set, the middle-pressure cylinder (101) and the low-pressure cylinder (102) are connected through the steam exhaust pipeline (10), and a heat supply steam extraction pipeline (20) is connected to the steam exhaust pipeline (10) between the low-pressure cylinder steam inlet butterfly valve (1) and the middle-pressure cylinder (101);
the heat supply butterfly valve (2) is arranged on the heat supply steam extraction pipeline (20), and one end, far away from the steam exhaust pipeline (10), of the heat supply steam extraction pipeline (20) is connected with the heat supply network heater (103);
the heater steam inlet butterfly valve (3) is arranged on a heat supply steam extraction pipeline (20) close to the heat supply network heater (103), the water supply end of the heat supply network heater (103) is connected with the water inlet end of a heat supply network through a water supply pipeline (30), and a driving steam pipeline (40) is connected on the heat supply steam extraction pipeline (20) between the heater steam inlet butterfly valve (3) and the heat supply butterfly valve (2);
the driving steam regulating valve (4) is arranged on the driving steam pipeline (40), and one end, far away from the heat supply steam extraction pipeline (20), of the driving steam pipeline (40) is connected with the power input end of the absorption heat pump (104); the steam absorption end of the absorption heat pump (104) is connected with the small steam turbine (105) through a steam absorption pipeline (50), and the condensate output end of the absorption heat pump (104) is connected with a condensate pipeline (60);
the system comprises a DCS (distributed control system) controller (200), wherein the DCS controller (200) comprises an exhaust steam pressure control unit (210), a water supply temperature control unit (220), a condensate water temperature control unit (230) and a heat supply pressure control unit (240) which are respectively in communication connection with the DCS controller (200);
the exhaust steam pressure control unit (210) is in communication connection with the low-pressure cylinder steam inlet butterfly valve (1) to adjust the exhaust steam pressure of the intermediate-pressure cylinder;
the water supply temperature control unit (220) is in communication connection with the heat supply butterfly valve (2) to adjust the water supply temperature of the heat supply network heater (103);
the condensed water temperature control unit (230) is in communication connection with the driving steam regulating valve (4) to regulate the temperature of the exhaust steam condensed water of the small turbine in a condensed water pipeline (60) of the absorption heat pump (104);
the heating pressure control unit (240) is in communication connection with the heater steam inlet butterfly valve (3) to form regulation of driving steam pressure provided by the heat supply network heater (103) to the absorption heat pump (104).
2. A heating control system using waste heat of exhaust steam of small machine as claimed in claim 1, wherein a steam exhaust pressure gauge (211) communicatively connected to the steam exhaust pressure control unit (210) is provided on the steam exhaust pipe (10) between the intermediate pressure cylinder (101) and the heating steam extraction pipe (20).
3. A heating control system using the waste heat of exhaust steam of small machine as claimed in claim 1, wherein a heating pressure gauge (241) connected to the heating pressure control unit (240) is provided on the heating extraction pipe (20) between the heater steam inlet butterfly valve (3) and the heating network heater (103).
4. A heating control system using waste heat of exhaust steam of small machine as claimed in claim 1, wherein the water supply pipeline (30) is provided with a water supply temperature meter (221) in communication connection with the water supply temperature control unit (220).
5. A heating control system capable of utilizing the waste heat of the exhaust steam of the small engine as claimed in claim 1, wherein a condensed water temperature meter (231) in communication connection with the condensed water temperature control unit (230) is arranged on the condensed water pipeline (60);
and a condensate control valve (61) which is in communication connection with the DCS controller (200) is arranged on the condensate pipeline (60).
6. A heating control system capable of utilizing the waste heat of the exhaust steam of the small engine as set forth in claim 1, wherein the steam suction pipeline (50) is provided with a steam suction control valve (51) in communication connection with the DCS controller (200);
be located and be connected with condensing pipe (52) on the steam-absorbing pipeline (50) between steam-absorbing control valve (51) and small steam turbine (105), condensing pipe (52) are kept away from steam-absorbing pipeline (50) one end and are connected with condenser (106), are provided with condensing control valve (53) with DCS controller (200) communication connection on condensing pipe (52).
7. A heating control system capable of utilizing the waste heat of the small machine exhaust steam according to claim 1, wherein a water return end of the heating network is connected with the heating network heater (103) through a heating network water return pipeline (70), and the heating network water return pipeline (70) is provided with a heating network water return control valve (71) which is in communication connection with the DCS controller (200);
a water return end of the heat supply pipe network is connected with a water return end of an absorption heat pump (104) through a heat pump water return pipeline (80), and a heat pump water return control valve (81) which is in communication connection with a DCS controller (200) is arranged on the heat pump water return pipeline (80);
the heat outlet end of the absorption heat pump (104) is connected with a heat supply network water return pipeline (70) through a heat outlet pipeline (90), and a heat outlet control valve (91) in communication connection with a DCS controller (200) is arranged on the heat outlet pipeline (90).
8. A heat supply control method of a heat supply control system capable of utilizing waste heat of exhaust steam of small engines according to any one of claims 1 to 7, characterized by comprising the following steps:
regulating and controlling the steam inlet butterfly valve of the low-pressure cylinder:
acquiring the steam turbine set evaporation parameter and the medium pressure cylinder steam exhaust pressure parameter before the low pressure cylinder steam inlet butterfly valve (1) and the heat supply butterfly valve (2) are additionally installed, drawing a relation curve of the set evaporation and the medium pressure cylinder steam exhaust pressure, and taking the medium pressure cylinder steam exhaust pressure value in the relation curve as a standard value P1Sign boardThe exhaust pressure value of the intermediate pressure cylinder after the low pressure cylinder steam inlet butterfly valve and the heat supply butterfly valve are additionally arranged is an actual value P1, and P1 and P1 are set in a DCS controller (200)Sign boardThe deviation value is +/-0.05 MPa, the DCS controller sends the set control logic to the steam exhaust pressure control unit (210), the steam exhaust pressure control unit (210) controls the low-pressure cylinder steam inlet butterfly valve (1), and P1 is regulated within the deviation value range to realize automatic regulation of the steam exhaust pressure of the intermediate pressure cylinder;
regulating and controlling a heat supply butterfly valve:
obtaining a standard value T1 of the water supply temperature of the heat supply network required under the current weather environment temperatureSign boardAnd according to T1Sign boardCalculating a heating pressure standard value P2 of the corresponding heating network heater (103)Sign boardThe actual value of the heating pressure of the heating network heater (103) is P2, and P2 and P2 are set in the DCS controller (200)Sign boardThe deviation value is +/-0.05 MPa, and the DCS controller (200) sends the set control logic to the water supply temperature control unit (220) to realize the adjustment of the actual value T1 of the water supply temperature of the heat supply network heater (103);
regulating and driving the steam regulating valve:
calculating the saturation temperature corresponding to the exhaust steam pressure of the small steam turbine (105), and using the saturation temperature as a standard value T2 of the condensate temperatureSign boardIn the condensate pipe (60) of the absorption heat pump (104)The actual value of the exhaust steam condensate temperature of the small steam turbine is T2, and T2 and T2 are set in a DCS controller (200)Sign boardThe deviation value is control logic of +/-5 ℃, and the DCS controller (200) issues the set control logic to the condensate temperature control unit (230) to adjust the steam exhaust condensate temperature of the small turbine in the condensate pipeline (60) of the absorption heat pump (104);
regulating and controlling a heater steam inlet butterfly valve:
according to the performance of the absorption heat pump (104), the lowest driving steam pressure required by the absorption heat pump (104) to absorb the dead steam of the small steam turbine (105) is calculated, and the lowest driving steam pressure is taken as a standard value P3Sign boardThe actual value of the driving steam pressure is P3, the P2 comprises P3, and P3 and P3 are set in a DCS controller (200)Sign boardThe deviation value is +/-0.05 MPa, the DCS controller (200) sends the set control logic to the heat supply pressure control unit (240) to adjust the steam inlet butterfly valve (3) of the heater, and the adjustment of the driving steam pressure provided by the heat supply network heater (103) to the absorption heat pump (104) is realized.
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| CN215927490U (en) * | 2020-12-24 | 2022-03-01 | 华能国际电力股份有限公司营口电厂 | Heat supply control system capable of utilizing waste heat of small machine exhaust steam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20120240579A1 (en) * | 2011-03-23 | 2012-09-27 | Kabushiki Kaisha Toshiba | Carbon-dioxide-recovery-type thermal power generation system and method of operating the same |
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