CN110230521B - Cascade heating system for heat pump by cutting off steam inlet coupling of low-pressure cylinder of thermoelectric unit and adjusting method - Google Patents
Cascade heating system for heat pump by cutting off steam inlet coupling of low-pressure cylinder of thermoelectric unit and adjusting method Download PDFInfo
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- CN110230521B CN110230521B CN201910183069.5A CN201910183069A CN110230521B CN 110230521 B CN110230521 B CN 110230521B CN 201910183069 A CN201910183069 A CN 201910183069A CN 110230521 B CN110230521 B CN 110230521B
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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
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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
- 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
- F01K17/005—Using steam or condensate extracted or exhausted from steam engine plant by means of a heat pump
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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
- F01K17/025—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
Abstract
The invention relates to a cascade heat supply system of a heat pump with steam inlet coupling of a low-pressure cylinder cut-off of a thermoelectric unit and an adjusting method, which comprises the following steps: the two sets of steam turbines comprise a medium-pressure cylinder, a low-pressure cylinder, a condenser, a cooling tower, a heat supply network heater, a steam cooler, an absorption heat pump, a drainage heat exchanger and a drainage cooler; the steam inlet end and the steam outlet end of the cooling steam pipe are respectively connected with a middle pressure cylinder of the second steam turbine and a low pressure cylinder of the second steam turbine, a pressure reducing valve and a steam cooler are arranged on the cooling steam pipe, heat supply network water is firstly subjected to first-stage heating through an absorption heat pump and a drainage heat exchanger, then is subjected to second-stage heating through a first heat supply network heater and a second heat supply network heater, and a low-temperature heat source of the absorption heat pump is from a first condenser, a second condenser, a steam cooler and a drainage cooler. The invention realizes near zero loss of cold end waste heat of the thermal power plant, meets the auxiliary peak shaving requirement of the power grid, deeply digs the heat supply capacity of the unit, and has larger practical application value.
Description
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a cascade heat supply system of a heat pump with steam inlet coupling of a low-pressure cylinder cut-off of a thermoelectric unit and an adjusting method.
Background
For thermal power plants, the exhaust steam of the steam turbine is usually directly discharged through an air cooling or water cooling mode, which causes huge cold end loss. For example, the energy utilization rate of a 300MW subcritical pure condensing unit is about 38%, wherein the cold end loss is about 45%, the energy utilization rate of the unit is improved to 60% after steam extraction and heat supply are adopted, but 20% of condensed low-temperature waste heat is discharged, and the heat is difficult to directly utilize due to low grade. Meanwhile, as the power grid is used for absorbing new energy and power, the requirements on the thermal power flexibility of the coal motor unit are continuously enhanced, and the coal motor unit needs to realize ultralow-load operation to meet the peak regulation requirement of the power grid, so that the coal-fired thermoelectric unit is extremely challenged.
At present, the patent 'steam turbine extraction condensing back system and the adjusting method thereof (patent number 201710193938.3)', the low-pressure cylinder can be realized without replacing a rotor, the technology can not only furthest increase the external heat supply, but also realize the low-load power generation of a unit with high benefit; the technical disadvantage of this patent is that the quality of the cooling steam cannot be effectively controlled, and the steam energy of the heating extraction steam is not fully recycled. The patent 'a waste steam waste heat recovery device of a wet-cold power plant and a recovery method thereof (patent number 201210289595.8)', and realizes the effective recovery and utilization of the waste heat of the cold end of a steam turbine. However, aiming at a thermal power plant with two thermoelectric units put into operation, how to enable one thermoelectric unit to meet the auxiliary peak regulation requirement of a power grid and thoroughly solve the phenomenon that the cold end waste heat of the thermal power plant is wasted is an urgent requirement of the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a cascade heating system and an adjusting method for a thermoelectric unit cut-off low-pressure cylinder steam inlet coupling heat pump, which are reasonable in design, reliable in performance and beneficial to realizing cooling waste heat recovery and heat energy cascade utilization of the thermoelectric unit.
The invention solves the problems by adopting the following technical scheme: a heat pump cascade heating system for cutting off steam inlet of low-pressure cylinder and coupling with steam inlet of thermoelectric unit is characterized in that it comprises: the system comprises a first turbine intermediate pressure cylinder, a first turbine low pressure cylinder, a first condenser, a first cooling tower, a first heat supply network heater, a second turbine intermediate pressure cylinder, a second turbine low pressure cylinder, a second condenser, a second cooling tower, a second heat supply network heater, a steam cooler, an absorption heat pump, a drainage heat exchanger and a drainage cooler; the steam outlet of the first turbine medium pressure cylinder is connected with the steam inlet of the first turbine low pressure cylinder through a first communication pipe, a first hydraulic butterfly valve is arranged on the first communication pipe, the steam outlet of the first turbine low pressure cylinder is connected with the steam side of the first condenser, the water side of the first condenser is connected with the first cooling tower through a first circulating water supply pipe and a first circulating water return pipe, a first valve and a second valve are respectively arranged on the first circulating water supply pipe and the first circulating water return pipe, the steam outlet of the first turbine medium pressure cylinder is also connected with the steam inlet of the first heat supply network heater through a first heating steam extraction pipe, a third valve is arranged on the first heating steam extraction pipe, the steam outlet of the second turbine medium pressure cylinder is connected with the steam inlet of the second turbine low pressure cylinder through a second communication pipe, a second hydraulic butterfly valve is arranged on the second communication pipe, the exhaust port of the second turbine low pressure cylinder is connected with the steam side of the second condenser, the water side of the second condenser is connected with the second cooling tower through a second circulating water supply pipe and a second circulating water return pipe, a valve No. six and a valve No. seven are respectively arranged on the second circulating water supply pipe and the second circulating water return pipe, the exhaust port of the second turbine medium pressure cylinder is also connected with the steam inlet of the second turbine low pressure cylinder through a cooling steam pipe, a valve No. nine, a pressure reducing valve, a steam cooler and a stop valve are sequentially arranged on the cooling steam pipe along the steam flowing direction, the steam outlet of the second turbine medium pressure cylinder is also connected with the steam inlet of the second heating network heater and the steam inlet of the absorption heat pump through a second heating steam extracting pipe, and a valve No. eight is respectively arranged on the second heating steam extracting pipe, the steam inlet of the second heating network heater and the steam inlet of the absorption heat pump, the water inlet end of the second water drain branch pipe is connected with the water drain outlet of the water drain heat exchanger and the water drain outlet of the absorption heat pump, the water outlet end of the second water drain branch pipe is connected with the water drain inlet of the water drain heat exchanger, the water outlet end of the second water drain branch pipe is connected with the water drain outlet of the absorption heat pump, an eighteen valve and a nineteen valve are respectively arranged at the water drain outlet of the water drain heat exchanger and the water drain outlet of the absorption heat pump, the water outlet end of the second water drain branch pipe is connected with the water drain inlet of the water drain cooler, the water side of the first water drain branch pipe is connected with the low-temperature water side of the absorption heat pump through a first circulating water return branch pipe and a first circulating water supply branch pipe, five valves and four valves are respectively arranged on the water outlet end of the first water drain branch pipe and the first circulating water supply branch pipe, the water side of the second water drain branch pipe is connected with the water drain side of the absorption heat pump through a second circulating water return pipe and a second water return pipe, the water side of the water drain heat pump is connected with the water side of the water heater through a second circulating water return pipe and a water return pipe, the water side of the water return pipe is connected with the water return side of the water pump through a second circulating water return pipe and the water return pipe, the water return valve is connected with the water return side of the water return pipe is provided with the water return valve of the water heater, the water heater is connected with the water heater through the water return valve, the second cooling water return branch pipe and the second cooling water supply branch pipe are respectively provided with an twenty-eighth valve and a twenty-ninth valve, the heating water return pipe is simultaneously connected with a high-temperature water side inlet of the absorption heat pump and a low-temperature water side inlet of the drainage heat exchanger, the twenty-eighth valve and the twenty-second valve are respectively arranged at the high-temperature water side inlet of the absorption heat pump and the low-temperature water side inlet of the drainage heat exchanger, the water inlet end of the heating connecting pipe is simultaneously connected with a high-temperature water side outlet of the absorption heat pump and a low-temperature water side outlet of the drainage heat exchanger, the twenty-eighth valve and the twenty-third valve are respectively arranged at the high-temperature water side outlet of the absorption heat pump and the low-temperature water side outlet of the drainage heat exchanger, the water outlet end of the heating connecting pipe is simultaneously connected with a water inlet of the first heat network heater and a water inlet of the second heat network heater, the twenty-fifteenth valve and the twenty-fourth valve are respectively arranged at the water inlet of the first heat network heater and the water inlet of the second heat network heater, and the twenty-seventh valve are respectively arranged at the water outlet of the first heat network heater and the second heat network heater.
Further, the first condenser is connected with the first cooling tower and the second cooling tower at the same time, and the second condenser is connected with the first cooling tower and the second cooling tower at the same time.
Furthermore, the low-temperature heat source of the absorption heat pump is from the first condenser, the second condenser, the steam cooler and the drain cooler, and the low-temperature waste heat of the first condenser, the second condenser, the steam cooler and the drain cooler is conveyed to the absorption heat pump through the circulating water system for waste heat recycling.
Furthermore, the drain water formed by the heating steam from the first heating steam extraction pipe and the second heating steam extraction pipe is cooled in the drain heat exchanger and the drain cooler in sequence, and the cooled drain water is output by the drain cooler and enters the second condenser.
Further, the absorption heat pump and the hydrophobic heat exchanger are connected in parallel, and simultaneously perform first-stage heating on the heat supply network water, and the first heat supply network heater and the second heat supply network heater are connected in parallel, and simultaneously perform second-stage heating on the heat supply network water.
The adjusting method of the cascade heat supply system of the low-pressure cylinder steam inlet coupling heat pump is as follows:
opening and adjusting a first hydraulic butterfly valve and a third valve, wherein one part of exhaust steam of a first turbine middle pressure cylinder enters a first turbine low pressure cylinder to do work, and the other part of exhaust steam is output by a first heating steam extraction pipe to supply heat to the outside;
the second hydraulic butterfly valve is fully closed, the valve No. eight is opened, the exhaust steam of the second turbine intermediate pressure cylinder does not enter the second turbine low pressure cylinder any more to do work, but the second heating steam extraction pipe outputs heat to the outside;
opening and adjusting a fourteen valve, a fifteen valve, a sixteen valve, a seventeen valve, an eighteen valve and a nineteenth valve, heating steam respectively heats heat supply network water in a first heat supply network heater and a second heat supply network heater, meanwhile, heating steam enters an absorption heat pump as a driving heat source, the drainage output by the first heat supply network heater and the drainage output by the second heat supply network heater are mixed and then enter a drainage heat exchanger to heat the heat supply network water, and the drainage output by the drainage heat exchanger and the drainage output by the absorption heat pump are mixed and then enter a drainage cooler;
and opening a twenty-first valve, a twenty-second valve, a twenty-third valve, a twenty-fourth valve, a twenty-fifth valve, a twenty-sixth valve and a twenty-seventh valve, wherein two branches of the heat supply network water from the heating return pipe respectively enter an absorption heat pump and a hydrophobic heat exchanger to carry out first-stage heating, the heat supply network water output by the absorption heat pump and the heat supply network water output by the hydrophobic heat exchanger are mixed and then are respectively divided into two branches to enter a first heat supply network heater and a second heat supply network heater to carry out second-stage heating, and the heat supply network water output by the first heat supply network heater and the heat supply network water output by the second heat supply network are mixed and then are output by a heating water supply pipe to supply heat.
The adjusting method for the cascade heat supply system of the low-pressure cylinder steam inlet coupling heat pump is characterized in that:
and a valve No. nine, a pressure reducing valve and a stop valve are also required to be opened and regulated, and a small exhaust steam from the pressure cylinder of the second turbine is conveyed to the low pressure cylinder of the second turbine after being subjected to temperature and pressure reduction, so that the low pressure cylinder of the second turbine is cooled.
The adjusting method for the cascade heat supply system of the low-pressure cylinder steam inlet coupling heat pump is characterized in that:
and closing the valve No. six and the valve No. seven, opening the valve No. twelve and the valve No. thirteen, opening and adjusting the valve No. one, the valve No. two, the valve No. four, the valve No. five, the valve No. ten, the valve No. eleven, the valve No. twenty-eight and the valve No. twenty-nine, stopping the operation of the second cooling tower, heating the circulating water by using the first condenser, the second condenser, the steam cooler and the drain cooler, and conveying the heated circulating water to the absorption heat pump as a low-temperature heat source of the absorption heat pump for waste heat recovery.
The adjusting method for the cascade heat supply system of the low-pressure cylinder steam inlet coupling heat pump is characterized in that:
the waste heat of the circulating water from the second condenser and the steam cooler is preferentially utilized, and the waste heat of the circulating water from the drain cooler and the first condenser is secondarily utilized.
Compared with the prior art, the invention has the following advantages and effects: reasonable in design, simple structure, the dependable performance, the coupling system of rational design absorption heat pump and excision low pressure jar admission to realize: (1) The cold end waste heat of the two thermoelectric units is effectively recycled, so that the cold end near zero loss of the thermal power plant is realized; (2) The heat supply capacity of the thermoelectric unit is deeply excavated while the auxiliary peak regulation requirement of the power grid is met, so that the current power market reform and the rapid development of the heat supply market can be dealt with; (3) Based on the principle of 'temperature opposite port and cascade utilization', the heat supply network water is subjected to cascade heating, so that irreversible loss caused by overlarge temperature difference between steam and the heat supply network water is reduced. Therefore, the invention has great practical application value.
Drawings
Fig. 1 is a schematic structural diagram of a cascade heating system of a heat pump with a low-pressure cylinder cut-off and steam inlet coupling of a thermal motor unit in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1, the thermoelectric unit in this embodiment cuts off a low-pressure cylinder steam inlet coupling heat pump cascade heat supply system, which includes: the system comprises a first turbine intermediate pressure cylinder 11, a first turbine low pressure cylinder 12, a first condenser 13, a first cooling tower 14, a first heat supply network heater 15, a second turbine intermediate pressure cylinder 21, a second turbine low pressure cylinder 22, a second condenser 23, a second cooling tower 24, a second heat supply network heater 25, a steam cooler 26, an absorption heat pump 1, a hydrophobic heat exchanger 2 and a hydrophobic cooler 3.
The steam outlet of the first turbine medium pressure cylinder 11 is connected with the steam inlet of the first turbine low pressure cylinder 12 through a first communication pipe 101, a first hydraulic butterfly valve 51 is arranged on the first communication pipe 101, the steam outlet of the first turbine low pressure cylinder 12 is connected with the steam side of the first condenser 13, the water side of the first condenser 13 is connected with the first cooling tower 14 through a first circulating water supply pipe 103 and a first circulating water return pipe 104, a first valve 52 and a second valve 53 are respectively arranged on the first circulating water supply pipe 103 and the first circulating water return pipe 104, the steam outlet of the first turbine medium pressure cylinder 11 is also connected with the steam inlet of the first heating network heater 15 through a first heating steam extraction pipe 102, a third valve 54 is arranged on the first heating steam extraction pipe 102, the steam outlet of the second turbine medium pressure cylinder 21 is connected with the steam inlet of the second turbine low pressure cylinder 22 through a second communication pipe 201, the second communicating pipe 201 is provided with a second hydraulic butterfly valve 57, the steam outlet of the second turbine low pressure cylinder 22 is connected with the steam side of the second condenser 23, the water side of the second condenser 23 is connected with the second cooling tower 24 through a second circulating water supply pipe 203 and a second circulating water return pipe 204, the second circulating water supply pipe 203 and the second circulating water return pipe 204 are respectively provided with a valve No. 58 and a valve No. seven 59, the steam outlet of the second turbine medium pressure cylinder 21 is also connected with the steam inlet of the second turbine low pressure cylinder 22 through a cooling steam pipe 205, the cooling steam pipe 205 is sequentially provided with a valve No. 61, a pressure reducing valve 62, a steam cooler 26 and a stop valve 63 along the steam flow direction, the steam outlet of the second turbine medium pressure cylinder 21 is also connected with the steam inlet of the second heating network heater 25 and the steam inlet of the absorption heat pump 1 through a second heating steam extraction pipe 202, and the steam inlet of the second heating steam extraction pipe 202, the steam inlet of the second heating network heater 25 and the steam inlet of the absorption heat pump 1 are respectively provided with a valve No. 60, a valve No. fourteen 68 and a valve No. fifteen 69, the water inlet end of the first drainage branch pipe 31 is simultaneously connected with the drainage outlet of the first heating network heater 15 and the drainage outlet of the second heating network heater 25, the drainage outlet of the first heating network heater 15 and the drainage outlet of the second heating network heater 25 are respectively provided with a valve No. 70 and a valve No. seventeen 71, the water outlet end of the first drainage branch pipe 31 is connected with the drainage inlet of the drainage heat exchanger 2, the water inlet end of the second drainage branch pipe 32 is simultaneously connected with the drainage outlet of the drainage heat exchanger 2 and the drainage outlet of the absorption heat pump 1, the drainage outlet of the drainage heat exchanger 2 and the drainage outlet of the absorption heat pump 1 are respectively provided with a valve No. 72 and a valve No. nineteenth 73, the water outlet end of the second drain branch pipe 32 is connected with the drain inlet of the drain cooler 3, the water side of the first condenser 13 is also connected with the low-temperature water side of the absorption heat pump 1 through a first circulating water return branch pipe 33 and a first circulating water supply branch pipe 34, a fifth valve 56 and a fourth valve 55 are respectively arranged on the first circulating water return branch pipe 33 and the first circulating water supply branch pipe 34, the water side of the second condenser 23 is also connected with the low-temperature water side of the absorption heat pump 1 through a second circulating water return branch pipe 35 and a second circulating water supply branch pipe 36, a twelve valve 66 and a thirteenth valve 67 are respectively arranged on the second circulating water return branch pipe 35 and the second circulating water supply branch pipe 36, the water side of the steam cooler 26 is connected with the low-temperature water side of the absorption heat pump 1 through a first cooling water return branch pipe 37 and a first cooling water supply branch pipe 38, and a valve 64 and a valve 65 are respectively installed on the first cooling backwater branch pipe 37 and the first cooling water supply branch pipe 38, the cooling water side of the drain cooler 3 is connected with the low-temperature water side of the absorption heat pump 1 through a second cooling backwater branch pipe 39 and a second cooling water supply branch pipe 40, a valve 82 and a valve 83 are respectively installed on the second cooling backwater branch pipe 39 and the second cooling water supply branch pipe 40, the heating backwater pipe 41 is simultaneously connected with the high-temperature water side inlet of the absorption heat pump 1 and the low-temperature water side inlet of the drain heat exchanger 2, a valve 74 and a valve 76 are respectively installed on the high-temperature water side inlet of the absorption heat pump 1 and the low-temperature water side inlet of the drain heat exchanger 2, the water inlet end of the heating connecting pipe 42 is simultaneously connected with the high-temperature water side outlet of the absorption heat pump 1 and the low-temperature water side outlet of the drain heat exchanger 2, a valve 75 and a valve 77 are respectively installed on the twenty-first water inlet and a water outlet of the heating network 42, a valve 15 and a water inlet of the second water inlet of the drain heat exchanger 25 and a water outlet of the second heat exchanger 25 are respectively installed on the heating network 25 and a water outlet of the second water inlet of the drain heat exchanger 25 and a water outlet of the drain heat exchanger 25 and a valve 80 are respectively installed on the water inlet of the heating network 25 and a water inlet of the second water heater 25 and a water outlet of the drain heat exchanger 25.
In the present embodiment, the first condenser 13 is connected to both the first cooling tower 14 and the second cooling tower 24, and the second condenser 23 is connected to both the first cooling tower 14 and the second cooling tower 24.
In the present embodiment, the low-temperature heat source of the absorption heat pump 1 is from the first condenser 13, the second condenser 23, the steam cooler 26 and the drain cooler 3, and the low-temperature waste heat of the first condenser 13, the second condenser 23, the steam cooler 26 and the drain cooler 3 is conveyed to the absorption heat pump 1 through the circulating water system for waste heat recovery and utilization.
In this embodiment, the drain formed by the heating steam from the first heating steam extraction pipe 102 and the second heating steam extraction pipe 202 is cooled in the drain heat exchanger 2 and the drain cooler 3 in sequence, and the cooled drain is output by the drain cooler 3 and enters the second condenser 23.
In the present embodiment, the absorption heat pump 1 and the hydrophobic heat exchanger 2 are connected in parallel while performing first-stage heating of the heat supply network water, and the first heat supply network heater 15 and the second heat supply network heater 25 are connected in parallel while performing second-stage heating of the heat supply network water.
The adjustment method according to this embodiment is as follows:
at the initial end of heating, when the external required heat load is low:
opening and adjusting a first hydraulic butterfly valve 51, a second hydraulic butterfly valve 57, a third valve 54 and a eighth valve 60, wherein one part of the exhaust steam of the first turbine intermediate pressure cylinder 11 enters the first turbine low pressure cylinder 12 to do work, the other part of the exhaust steam is output by the first heating steam extraction pipe 102 to supply heat to the outside, one part of the exhaust steam of the second turbine intermediate pressure cylinder 21 enters the second turbine low pressure cylinder 22 to do work, and the other part of the exhaust steam is output by the second heating steam extraction pipe 202 to supply heat to the outside;
opening and adjusting a fourteen valve 68, a fifteen valve 69, a sixteen valve 70, a seventeen valve 71, an eighteen valve 72 and a nineteen valve 73, heating steam respectively heats heat supply network water in the first heat supply network heater 15 and the second heat supply network heater 25, meanwhile, heating steam enters the absorption heat pump 1 as a driving heat source, and after being mixed, water discharged by the first heat supply network heater 15 and water discharged by the second heat supply network heater 25 enter the water discharge heat exchanger 2 to heat the heat supply network water, and after being mixed, water discharged by the water discharge heat exchanger 2 and water discharged by the absorption heat pump 1 enter the water discharge cooler 3;
at this time, the first valve 52, the second valve 53, the fourth valve 55, the fifth valve 56, the sixth valve 58, the seventh valve 59, the twelfth valve 66, the thirteenth valve 67, the twenty-eighth valve 82 and the twenty-ninth valve 83 are opened and adjusted, the circulating water is heated by the first condenser 13, the second condenser 23 and the hydrophobic cooler 3, and the heated circulating water is used as a low-temperature heat source of the absorption heat pump 1 and is all conveyed to the absorption heat pump 1 for waste heat recovery.
At this time, the twenty-first valve 74, the twenty-first valve 75, the twenty-second valve 76, the twenty-third valve 77, the twenty-fourth valve 78, the twenty-fifth valve 79, the twenty-sixth valve 80 and the twenty-seventh valve 81 are opened and adjusted, two branches of the heat supply network water from the heating return pipe 41 enter the absorption heat pump 1 and the hydrophobic heat exchanger 2 respectively to perform first-stage heating, the heat supply network water output by the absorption heat pump 1 and the heat supply network water output by the hydrophobic heat exchanger 2 are mixed and then enter the first heat supply network heater 15 and the second heat supply network heater 25 respectively to perform second-stage heating, and the heat supply network water output by the first heat supply network heater 15 and the heat supply network water output by the second heat supply network heater 25 are mixed and then output by the heating water supply pipe 43 to supply heat.
In the heating alpine period, when the external required heat load is larger:
opening and adjusting a first hydraulic butterfly valve 51 and a third valve 54, wherein one part of exhaust steam of the first turbine medium-pressure cylinder 11 enters the first turbine low-pressure cylinder 12 to do work, and the other part of exhaust steam is output by a first heating steam extraction pipe 102 to supply heat to the outside;
the second hydraulic butterfly valve 57 is closed completely, the valve 60 of the eighth valve is opened, the exhaust steam of the second turbine intermediate pressure cylinder 21 does not enter the second turbine low pressure cylinder 22 any more to do work, and the second heating steam extraction pipe 202 outputs heat to the outside;
opening and adjusting a fourteen valve 68, a fifteen valve 69, a sixteen valve 70, a seventeen valve 71, an eighteen valve 72 and a nineteen valve 73, heating steam respectively heats heat supply network water in the first heat supply network heater 15 and the second heat supply network heater 25, meanwhile, heating steam enters the absorption heat pump 1 as a driving heat source, and after being mixed, water discharged by the first heat supply network heater 15 and water discharged by the second heat supply network heater 25 enter the water discharge heat exchanger 2 to heat the heat supply network water, and after being mixed, water discharged by the water discharge heat exchanger 2 and water discharged by the absorption heat pump 1 enter the water discharge cooler 3;
opening and adjusting a twenty-first valve 74, a twenty-first valve 75, a twenty-second valve 76, a twenty-third valve 77, a twenty-fourth valve 78, a twenty-fifth valve 79, a twenty-sixth valve 80 and a twenty-seventh valve 81, respectively, enabling two branches of heat supply network water from a heating water return pipe 41 to enter an absorption heat pump 1 and a hydrophobic heat exchanger 2 for first-stage heating, enabling heat supply network water output by the absorption heat pump 1 and heat supply network water output by the hydrophobic heat exchanger 2 to be mixed, enabling the two branches to enter a first heat supply network heater 15 and a second heat supply network heater 25 for second-stage heating respectively, enabling the heat supply network water output by the first heat supply network heater 15 and the heat supply network water output by the second heat supply network heater 25 to be mixed, and then enabling the heat supply network water output by the heating water supply pipe 43 to supply heat to the outside;
at this time, the valve No. 61, the pressure reducing valve 62 and the shutoff valve 63 are opened and adjusted, and a small exhaust steam from the second turbine intermediate pressure cylinder 21 is delivered to the second turbine low pressure cylinder 22 after being subjected to temperature and pressure reduction, so as to cool the second turbine low pressure cylinder 22;
at this time, the valve No. 58 and the valve No. 59 are closed, the valve No. 66 and the valve No. 67 are opened, the valve No. 52, the valve No. 53, the valve No. 55, the valve No. 56, the valve No. 64, the valve No. 65, the valve No. 82 and the valve No. 83 are opened and adjusted, the second cooling tower 24 stops operating, the circulating water is heated by the first condenser 13, the second condenser 23, the steam cooler 26 and the drain cooler 3, and the heated circulating water is used as a low-temperature heat source of the absorption heat pump 1 and is conveyed to the absorption heat pump 1 for waste heat recovery and utilization.
In the specific adjustment method of the present embodiment, the residual heat of the circulating water from the second condenser 23 and the steam cooler 26 is preferentially utilized, and the residual heat of the circulating water from the drain cooler 3 and the first condenser 13 is secondarily utilized.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (9)
1. A heat pump cascade heating system for cutting off steam inlet of low-pressure cylinder and coupling with steam inlet of thermoelectric unit is characterized in that it comprises: the system comprises a first turbine intermediate pressure cylinder (11), a first turbine low pressure cylinder (12), a first condenser (13), a first cooling tower (14), a first heat supply network heater (15), a second turbine intermediate pressure cylinder (21), a second turbine low pressure cylinder (22), a second condenser (23), a second cooling tower (24), a second heat supply network heater (25), a steam cooler (26), an absorption heat pump (1), a hydrophobic heat exchanger (2) and a hydrophobic cooler (3); the exhaust port of the first turbine medium pressure cylinder (11) is connected with the inlet port of the first turbine low pressure cylinder (12) through a first communication pipe (101), a first hydraulic butterfly valve (51) is arranged on the first communication pipe (101), the exhaust port of the first turbine low pressure cylinder (12) is connected with the steam side of the first condenser (13), the water side of the first condenser (13) is connected with the first cooling tower (14) through a first circulating water supply pipe (103) and a first circulating water return pipe (104), a first valve (52) and a second valve (53) are respectively arranged on the first circulating water supply pipe (103) and the first circulating water return pipe (104), the exhaust port of the first turbine medium pressure cylinder (11) is also connected with the inlet port of the first heating network heater (15) through a first air extraction pipe (102), a third valve (54) is arranged on the first heating steam pipe (102), the second medium pressure cylinder (21) is connected with the inlet port of the second turbine low pressure cylinder (22) through a second communication pipe (201), the exhaust port of the second turbine medium pressure cylinder (11) is connected with the second butterfly valve (57) through a second communication pipe (201), the water side of the second condenser (23) is connected with the second cooling tower (24) through a second circulating water supply pipe (203) and a second circulating water return pipe (204), a valve No. six (58) and a valve No. seven (59) are respectively arranged on the second circulating water supply pipe (203) and the second circulating water return pipe (204), the steam outlet of the second turbine medium pressure cylinder (21) is also connected with the steam inlet of the second turbine low pressure cylinder (22) through a cooling steam pipe (205), a valve No. nine (61), a pressure reducing valve (62), a steam cooler (26) and a stop valve (63) are sequentially arranged on the cooling steam pipe (205) along the steam flowing direction, the steam outlet of the second turbine medium pressure cylinder (21) is also connected with the steam inlet of the second heating network heater (25) and the steam inlet of the absorption heat pump (1) through a second heating steam extraction pipe (202), the steam inlet of the second heating network heater (25) and the water inlet of the absorption heat pump (69) are respectively arranged at the same time, the steam outlet of the second steam inlet of the second steam pump medium pressure cylinder (21) is connected with the water heater (60) through a water inlet of the second heating branch pipe (25) and the water outlet of the water heater (60), the water outlet of the first heat supply network heater (15) and the water outlet of the second heat supply network heater (25) are respectively provided with sixteen valves (70) and seventeen valves (71), the water outlet end of the first water drain branch pipe (31) is connected with the water drain inlet of the water drain heat exchanger (2), the water inlet end of the second water drain branch pipe (32) is simultaneously connected with the water drain outlet of the water drain heat exchanger (2) and the water drain outlet of the absorption heat pump (1), the water drain outlet of the water drain heat exchanger (2) and the water drain outlet of the absorption heat pump (1) are respectively provided with eighteen valves (72) and nineteen valves (73), the water outlet end of the second water drain branch pipe (32) is connected with the water drain inlet of the water drain cooler (3), the water side of the first condenser (13) is also connected with the low-temperature water side of the absorption heat pump (1) through a first circulating water return branch pipe (33) and a first circulating water return branch pipe (34), the water supply side of the second condenser (35) is respectively provided with a fifth valve (56) on the water drain outlet of the water drain heat exchanger (2) and the water return side of the absorption heat pump (1), the water return side of the second condenser (13) is also connected with the water return side of the water return pipe (35) through a fourth valve (35), and twelve valves (66) and thirteen valves (67) are respectively arranged on a second circulating water return branch pipe (35) and a second circulating water supply branch pipe (36), the water side of the steam cooler (26) is connected with the low-temperature water side of the absorption heat pump (1) through a first cooling water return branch pipe (37) and a first cooling water supply branch pipe (38), a ten-valve (64) and an eleven-valve (65) are respectively arranged on the first cooling water return branch pipe (37) and the first cooling water supply branch pipe (38), the cooling water side of the hydrophobic cooler (3) is connected with the low-temperature water side of the absorption heat pump (1) through a second cooling water return branch pipe (39) and a second cooling water supply branch pipe (40), twenty-eight valves (82) and twenty-nine-valve (83) are respectively arranged on the second cooling water return branch pipe (39) and the second cooling water supply branch pipe (40), the heating water return pipe (41) is simultaneously connected with the high-temperature water side inlet of the absorption heat pump (1) and the low-temperature water side of the low-temperature water heat exchanger (2), the low-temperature water side of the absorption heat pump (1) is provided with twenty-low-temperature water side water inlet (74) and twenty-low-temperature water side heat exchanger (74) is respectively arranged on the second cooling water side of the absorption heat pump (1), the water inlet end of the heat supply connecting pipe (42) is connected with the high-temperature water side outlet of the absorption heat pump (1) and the low-temperature water side outlet of the drainage heat exchanger (2) simultaneously, twenty-first valve (75) and twenty-third valve (77) are respectively arranged at the high-temperature water side outlet of the absorption heat pump (1) and the low-temperature water side outlet of the drainage heat exchanger (2), the water outlet end of the heat supply connecting pipe (42) is connected with the water inlet of the first heat supply network heater (15) and the water inlet of the second heat supply network heater (25) simultaneously, twenty-fifth valve (79) and twenty-fourth valve (78) are respectively arranged at the water inlet of the first heat supply network heater (15) and the water inlet of the second heat supply network heater (25), and twenty-first valve (81) and twenty-third valve (80) are respectively arranged at the water outlet of the first heat supply network heater (15) and the water outlet of the second heat supply network heater (25) simultaneously.
2. The low-pressure cylinder cut-off steam-inlet coupling heat pump cascade heat supply system of a thermoelectric unit according to claim 1, wherein the first condenser (13) is connected with the first cooling tower (14) and the second cooling tower (24) at the same time, and the second condenser (23) is connected with the first cooling tower (14) and the second cooling tower (24) at the same time.
3. The cascade heat supply system of the thermoelectric unit cut-off low-pressure cylinder steam inlet coupling heat pump according to claim 1, wherein the low-temperature heat source of the absorption heat pump (1) is from a first condenser (13), a second condenser (23), a steam cooler (26) and a drain cooler (3), and the low-temperature waste heat of the first condenser (13), the second condenser (23), the steam cooler (26) and the drain cooler (3) is conveyed to the absorption heat pump (1) through a circulating water system for waste heat recycling.
4. The cascade heat supply system of a thermoelectric unit cut-off low-pressure cylinder steam inlet coupling heat pump according to claim 1, wherein drainage formed by heating steam from a first heating steam extraction pipe (102) and a second heating steam extraction pipe (202) is cooled in a drainage heat exchanger (2) and a drainage cooler (3) in sequence, and cooled drainage is output by the drainage cooler (3) and enters a second condenser (23).
5. The cascade heat supply system of a thermoelectric unit cut-off low-pressure cylinder steam inlet coupling heat pump according to claim 1, wherein the absorption heat pump (1) and the hydrophobic heat exchanger (2) are connected in parallel, and simultaneously perform first-stage heating on heat supply network water, and the first heat supply network heater (15) and the second heat supply network heater (25) are connected in parallel, and simultaneously perform second-stage heating on heat supply network water.
6. A method for adjusting a step heating system of a cut-off low-pressure cylinder steam inlet coupling heat pump of a thermoelectric unit according to any one of claims 1 to 5, wherein the adjusting method comprises the following steps:
opening and adjusting a first hydraulic butterfly valve (51) and a third valve (54), wherein one part of exhaust steam of a first turbine medium-pressure cylinder (11) enters a first turbine low-pressure cylinder (12) to do work, and the other part of exhaust steam is output by a first heating steam extraction pipe (102) to supply heat to the outside;
the second hydraulic butterfly valve (57) is closed completely, the valve No. 60 is opened, the exhaust steam of the second turbine intermediate pressure cylinder (21) does not enter the second turbine low pressure cylinder (22) any more to do work, and the second heating steam extraction pipe (202) outputs heat to the outside;
opening and adjusting a fourteen valve (68), a fifteen valve (69), a sixteen valve (70), a seventeen valve (71), an eighteen valve (72) and a nineteen valve (73), heating steam heats heat supply network water in a first heat supply network heater (15) and a second heat supply network heater (25) respectively, meanwhile, heating steam enters an absorption heat pump (1) as a driving heat source, and after being mixed with water discharged by the first heat supply network heater (15) and water discharged by the second heat supply network heater (25), the mixture enters a water discharge heat exchanger (2) to heat the heat supply network water, and after being mixed with water discharged by the water discharge heat exchanger (2) and water discharged by the absorption heat pump (1), the mixture enters a water discharge cooler (3);
and opening a twenty-first valve (74), a twenty-first valve (75), a twenty-second valve (76), a twenty-third valve (77), a twenty-fourth valve (78), a twenty-fifth valve (79), a twenty-sixth valve (80) and a twenty-seventh valve (81), wherein two branches of heat supply water from a heating return pipe (41) respectively enter an absorption heat pump (1) and a hydrophobic heat exchanger (2) to perform first-stage heating, and after the heat supply water output by the absorption heat pump (1) and the heat supply water output by the hydrophobic heat exchanger (2) are mixed, the two branches respectively enter a first heat supply pipe (15) and a second heat supply pipe (25) to perform second-stage heating, and after the heat supply water output by the first heat supply pipe (15) and the heat supply water output by the second heat supply pipe (25) are mixed, the heat supply water is output to the outside.
7. The method for adjusting the cascade heating system of the heat pump with steam inlet coupling to the low-pressure cylinder cut-off of the thermoelectric unit according to claim 6, wherein a valve No. 61, a pressure reducing valve 62 and a stop valve 63 are also opened and adjusted, and a small exhaust steam from the low-pressure cylinder 21 of the second turbine is conveyed to the low-pressure cylinder 22 of the second turbine after being subjected to temperature and pressure reduction, so that the low-pressure cylinder 22 of the second turbine is cooled.
8. The adjusting method for the cascade heat supply system of the thermoelectric unit cut-off low-pressure cylinder steam inlet coupling heat pump according to claim 7 is characterized in that a valve No. six (58) and a valve No. seven (59) are closed, a valve No. twelve (66) and a valve No. thirteen (67) are opened, a valve No. one (52), a valve No. two (53), a valve No. four (55), a valve No. five (56), a valve No. ten (64), a valve No. eleven (65), a valve No. twenty-eighth (82) and a valve No. twenty-ninth (83) are opened and adjusted, the second cooling tower (24) stops running, the circulating water is heated by the first condenser (13), the second condenser (23), the steam cooler (26) and the drain cooler (3), and the heated circulating water is used as a low-temperature heat source of the absorption heat pump (1) and is conveyed to the absorption heat pump (1) for waste heat recovery.
9. The method for adjusting the cascade heating system of the low-pressure cylinder cut-off and steam inlet coupling heat pump of the thermoelectric unit according to claim 8 is characterized in that the waste heat of the circulating water from the second condenser (23) and the steam cooler (26) is preferentially utilized, and the waste heat of the circulating water from the drain cooler (3) and the first condenser (13) is secondarily utilized.
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