CN107062351B - Heat supply network graded heating system utilizing small steam turbine and adjusting method thereof - Google Patents
Heat supply network graded heating system utilizing small steam turbine and adjusting method thereof Download PDFInfo
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- CN107062351B CN107062351B CN201710318641.5A CN201710318641A CN107062351B CN 107062351 B CN107062351 B CN 107062351B CN 201710318641 A CN201710318641 A CN 201710318641A CN 107062351 B CN107062351 B CN 107062351B
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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
- 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
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
- F24D2200/26—Internal combustion engine
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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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/02—Fluid distribution means
- F24D2220/0271—Valves
Abstract
The invention provides a heat supply network graded heating system utilizing a small steam turbine and an adjusting method thereof, which have reasonable design and reliable performance and are beneficial to realizing the recycling of available energy of a heat supply unit. The thermoelectric unit system comprises an extraction steam turbine, a main condenser, a condensate pump, an eight-stage low-heating heater, a seven-stage low-heating heater, a six-stage low-heating heater and a five-stage low-heating heater; the heat supply system comprises a heat supply network water return pipe, a heat supply network water supply pipe, a heat supply network circulating water pump, a secondary condenser, a drainage heat supply network heater, a plant generator, a pure condensing small turbine and a vacuumizing device. At the initial stage or the final stage of heating, the return water of the heat supply network is conveyed to the secondary condenser for heating through the return water pipe of the heat supply network, then conveyed to a water supply pipe of the heat supply network through a second heat supply network water bypass, and conveyed to a user through the water supply pipe of the heat supply network for heating; and in the heating severe cold period, the return water of the heat supply network is primarily heated by the secondary condenser, secondarily heated by the heat supply network heater and then conveyed to a user for heating.
Description
Technical Field
The invention relates to a heat supply network graded heating system utilizing a small steam turbine and an adjusting method thereof, belonging to the technical field of cogeneration.
Background
At present, the traditional centralized heating mode is that unit heating steam extraction is heated in a heating network heater and then is supplied to a user for heating, and during the period, great available energy loss exists. However, in the current technology, such as the heat supply energy-saving device with a back pressure machine added in a condensing unit, the energy-saving method thereof and the Chinese patent with publication number of CN102519067B, although the available energy of heating steam extraction is effectively utilized, the technology mainly aims at the heat supply modified unit with the steam extraction pressure of 0.8MPa, and the steam extraction pressure is also more than 0.1 MPa. For example, a Chinese patent with a name of a high-backpressure small steam turbine heating steam extraction heating system and a publication number of CN105927298A also aims at the heating steam extraction with the pressure of more than 0.7MPa after the pure condensing unit is subjected to heat supply transformation, and the designed steam pressure for heating the water in a heat supply network is reduced to 0.2-0.3 MPa.
Aiming at the existing heat supply unit, the designed heating steam pressure is 0.2-0.5MPa, and in the actual operation, particularly in the initial and final stages of heating, the temperature required by heat supply network water is only about 70-90 ℃, and at the moment, great available energy loss exists between the designed heating steam and the designed heating steam. Moreover, there is currently no effective means to recover it.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the heat supply network graded heating system which is reasonable in design, reliable in performance and beneficial to recycling the available energy of a heat supply unit and utilizes a small steam turbine and the adjusting method thereof.
The technical scheme adopted by the invention for solving the problems is as follows: a heat supply network graded heating system utilizing a small steam turbine comprises a thermal motor set system and a heat supply system; the thermoelectric unit system comprises an extraction steam turbine, a main condenser, a condensate pump, an eight-stage low-heating heater, a seven-stage low-heating heater, a six-stage low-heating heater and a five-stage low-heating heater; the extraction steam turbine, the main condenser, the condensate pump, the eight-stage low-pressure heater, the seven-stage low-pressure heater, the six-stage low-pressure heater and the five-stage low-pressure heater are sequentially connected; the steam extraction and condensation turbine is provided with a heating steam extraction pipe; the six-stage low-pressure heater is connected with a six-stage water supply pipe; the seven-level low-pressure heater is connected with a seven-level water supply pipe; the five-stage low-pressure heater is connected with a five-stage water supply pipe; the heat supply system comprises a plant power generator, a straight condensing small steam turbine and a vacuumizing device; the plant generator is connected with the straight condensing small turbine; the vacuumizing device is connected with the secondary condenser through a pipeline, and a control switch is arranged on the pipeline;
the method is characterized in that: the heat supply system also comprises a heat supply network return pipe, a heat supply network water supply pipe, a heat supply network circulating water pump, a secondary condenser, a drainage heat supply network heater and a heat supply network heater; the heat supply network circulating water pump is arranged on the heat supply network water return pipe; the heat supply network water return pipe is respectively connected with a cold source inlet of the secondary condenser and a cold source inlet of the drainage heat supply network heater through pipelines; the cold source inlet of the secondary condenser is provided with a No. eleven valve, the cold source outlet is provided with a No. twelve valve, and the cold source outlet of the secondary condenser is connected with the cold source inlet of the heat supply network heater; a cold source inlet of the drainage heat net heater is provided with a fifth valve, a cold source outlet is provided with a sixth valve, and the cold source outlet of the drainage heat net heater is connected with the cold source inlet of the heat net heater; a cold source inlet of the heat supply network heater is provided with a thirteen-numbered valve, a cold source outlet is provided with a fourteen-numbered valve, and the cold source outlet of the heat supply network heater is connected with a heat supply network water supply pipe; the heat supply network heater is provided with a heat supply network water bypass, and an eighth valve is arranged on the heat supply network water bypass; the heat supply network water bypass is respectively connected with a cold source inlet and a cold source outlet of the heat supply network heater; the heating steam extraction pipe is connected with a steam inlet of the heat supply network heater through a first steam extraction branch; the heating steam extraction pipe is also connected with a steam inlet of the straight condensing small steam turbine through a second steam extraction branch; a first valve is arranged on the first steam extraction branch, and a second valve is arranged on the second steam extraction branch; the straight condensing small steam turbine is connected with a steam inlet of the secondary steam turbine through a steam turbine exhaust pipe, and a third valve is arranged on the steam turbine exhaust pipe; the drainage outlet of the secondary condenser is connected with a seven-stage water supply pipe through a condensation water pipe, and a fourth valve is arranged on the condensation water pipe; the drainage heat supply network heater is connected with a six-stage water supply pipe through a drainage heater water outlet pipe, and a seventh valve is arranged on the drainage heater water outlet pipe; a drain outlet of the heat supply network heater is connected with the drain heat supply network heater through a drain pipe, and a No. nine valve is arranged on the drain pipe; the drain pipe is connected with the fifth-stage water supply pipe through a drain branch pipe, and a No. ten valve is installed on the drain branch pipe.
The secondary condenser is also connected with the main condenser through a vacuum-pumping pipe, and the vacuum-pumping pipe is provided with a block valve and a throttling device.
The secondary condenser is connected with the drainage heat supply network heater in parallel and then connected with the heat supply network heater in series.
A method for adjusting a heat supply network graded heating system by using a small steam turbine is characterized by comprising the following steps: the method comprises the following steps:
firstly, in the initial stage or the final stage of heating, the heating heat load demand is smaller, and at the moment:
closing the first valve, the tenth valve, the ninth valve, the thirteenth valve and the fourteenth valve, and stopping the operation of the heat supply network heater;
closing the fifth valve, the sixth valve and the seventh valve, and stopping the operation of the drainage heat supply network heater;
opening a second valve, a third valve, a fourth valve, an eleventh valve, a twelfth valve and an eighth valve, pumping steam of a heating steam pumping pipe firstly enters a straight condensing small steam turbine to do work, driving a plant generator to generate power, and driving a heat supply network circulating water pump and a condensate pump by electric power; the return water of the heat supply network is conveyed to a secondary condenser for heating through a return water pipe of the heat supply network, then conveyed to a water supply pipe of the heat supply network through a water bypass of the heat supply network, and conveyed to a user for heating through the water supply pipe of the heat supply network;
the drain water of the secondary condenser is conveyed to a seven-stage water supply pipe on the front side of the seven-stage low-pressure heater through a condensed water pipe;
the exhaust back pressure of the straight condensing small steam turbine and the back pressure of the secondary condenser are selected between 40kPa and 70kPa according to the temperature required by the water supply of the heat supply network;
second, when the high and cold period of heating, the heating heat load demand is great, this moment:
opening the first valve, the thirteen valve and the fourteen valve, closing the eighth valve, and putting the heat supply network heater into operation;
opening a second valve, a third valve, a fourth valve, an eleventh valve and a twelfth valve, closing an eighth valve, enabling the steam extracted by the heating steam extraction pipe to enter a straight condensing small steam turbine for acting, driving a plant generator to generate electricity, driving a heat supply network circulating water pump and a condensate pump by electric power, conveying the heat supply network return water to a secondary condenser for primary heating through a heat supply network return water pipe, then conveying the heat supply network return water to a heat supply network heater for secondary heating, and conveying the secondarily heated heat supply network water to a user for heating through a heat supply network water supply pipe;
closing the tenth valve, opening the ninth valve, the fifth valve, the sixth valve and the seventh valve, putting the drainage heat supply network heater into operation, conveying drainage of the heat supply network heater to the drainage heat supply network heater through a drainage pipe, simultaneously, allowing partial return water of the heat supply network to enter the drainage heat supply network heater for primary heating, mixing the drainage water with heat supply network water from the secondary condenser, then allowing the mixture to enter the heat supply network heater for secondary heating, and conveying drainage of the drainage heat supply network heater to a six-stage water supply pipe on the front side of a six-stage low-pressure heater through a drainage heater water outlet pipe;
when the drainage heat supply network heater is not put into use, the tenth valve is opened, the ninth valve, the fifth valve, the sixth valve and the seventh valve are closed, the drainage heat supply network heater stops running, and drainage of the heat supply network heater is conveyed to a fifth-stage water supply pipe on the front side of the fifth-stage low-pressure heater through the drainage branch pipe;
the exhaust back pressure of the straight condensing small steam turbine and the back pressure of the secondary condenser are selected between 40kPa and 70kPa according to the temperature required by the water inlet of the heat supply network heater.
The invention preferentially utilizes the secondary condenser to heat the heat supply network water, secondly utilizes the hydrophobic heat supply network heater to heat the heat supply network water, and finally utilizes the heat supply network heater to heat the heat supply network water.
The steam inlet pressure of the straight condensing small steam turbine is 0.2MPa to 0.5MPa, and the steam exhaust pressure is 40kPa to 70 kPa.
The back pressure of the secondary condenser is 40-70 kPa.
The secondary condenser is also connected with the main condenser through a vacuum tube, and the vacuum tube is provided with a block valve and a throttling device; the vacuum degree required by the secondary condenser is maintained in the following two ways: (1) the vacuum degree required by the secondary condenser is maintained by turning on the control switch and utilizing the vacuumizing device; (2) and opening the isolating valve, throttling by the throttling device, and then keeping the secondary condenser to reach the required vacuum degree by using the main condenser.
Compared with the prior art, the invention has the following advantages and effects: the heat supply unit has the advantages of reasonable design, simple structure and reliable performance, can effectively recycle the available energy of heating steam extraction of the heat supply unit, particularly can effectively recycle the available energy of heating steam extraction with the design pressure of the existing unit of 0.2-0.5MPa, and greatly reduces irreversible loss. The invention solves the problem of available energy loss caused by the design of heating extraction steam for heat supply of the existing heat supply unit, simultaneously recycles the effective heat of drainage of the heating extraction steam, realizes the maximum recycling of the available energy of the heating extraction steam, and has good energy-saving benefit and popularization value.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a thermoelectric power unit system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a heating system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1 to 3, the heat supply network staged heating system using the small steam turbine of the present embodiment includes a thermal electric motor set system and a heat supply system.
The thermoelectric unit system comprises a condensing turbine 11, a main condenser 12, a condensate pump 13, an eight-stage low-heating heater 14, a seven-stage low-heating heater 15, a six-stage low-heating heater 16 and a five-stage low-heating heater 17, wherein the condensing turbine 11, the main condenser 12, the condensate pump 13, the eight-stage low-heating heater 14, the seven-stage low-heating heater 15, the six-stage low-heating heater 16 and the five-stage low-heating heater 17 are sequentially connected.
The extraction steam turbine 11 is provided with a heating extraction steam pipe 401.
The front side of the six-stage low-pressure heater 16 is connected with a six-stage water feeding pipe 161.
The front side of the seven-stage low heater 15 is connected with a seven-stage water supply pipe 151.
The front side of the five-stage low-pressure heater 17 is connected with a five-stage water supply pipe 171.
The thermal battery system is the prior art and will not be described again.
The heating system comprises a heat supply network water return pipe 301, a heat supply network water supply pipe 302, a heat supply network circulating water pump 21, a secondary condenser 22, a drainage heat supply network heater 23, a heat supply network heater 24, a plant power generator 25, a straight condensing small turbine 26 and a vacuumizing device 27.
The power generated by the plant power generator 25 is used as plant power to drive the heat supply network circulating water pump 21, the condensate pump 13 and other power consumption equipment in the plant. The plant generator 25 is connected with a straight condensing small turbine 26.
The small condensing turbine 26 is a condensing unit, the steam inlet pressure is 0.2 MPa-0.5 MPa, and the steam exhaust pressure is 40 kPa-70 kPa. The exhaust from the straight condensing small turbine 26 is used to heat the heat supply network water.
The heat supply network water return pipe 301 is respectively connected with the cold source inlet of the secondary condenser 22 and the cold source inlet of the drainage heat supply network heater 23 through pipelines.
And an eleventh valve 223 is arranged on a cold source inlet of the secondary condenser 22, and a twelfth valve 224 is arranged on a cold source outlet. And a cold source outlet of the secondary condenser 22 is connected with a cold source inlet of the heat supply network heater 24 through a pipeline.
The secondary condenser 22 has a certain vacuum degree and the back pressure of 40-70 kPa; the vacuum-pumping device 27 can be used to maintain the required vacuum degree by opening the control switch 271; the blocking valve 502 may be opened, and after throttling by the throttling device 503, the sub-condenser 22 may be maintained at a desired vacuum degree by the main condenser 12.
And a fifth valve 232 is arranged at a cold source inlet of the drainage heat network heater 23, and a sixth valve 233 is arranged at a cold source outlet. The cold source outlet of the hydrophobic heat supply network heater 23 is connected with the cold source inlet of the heat supply network heater 24 through a pipeline.
The secondary condenser 22 is connected in parallel with the hydrophobic heat supply network heater 23 and then connected in series with the heat supply network heater 24.
A heating steam extraction pipe 401 of the steam extraction turbine 11 is connected with a steam inlet of the heat supply network heater 24 through a first steam extraction branch 402. The heating steam extraction pipe 401 is also connected with the steam inlet of the straight condensing small steam turbine 26 through a second steam extraction branch 405. A first valve 403 is installed on the first steam extraction branch 402, and a second valve 404 is installed on the second steam extraction branch 405.
The straight condensing small turbine 26 is connected with the steam inlet of the secondary condenser 22 through a turbine exhaust pipe 261, and a third valve 262 is installed on the turbine exhaust pipe 261.
The drain outlet of the secondary condenser 22 is connected with a seven-stage water supply pipe 151 on the front side of the seven-stage low-pressure heater 15 through a condensed water pipe 221, and a four-way valve 222 is installed on the condensed water pipe 221.
The vacuum extractor 27 is connected to the secondary condenser 22 through a pipe, and a control switch 271 is attached to the pipe.
The secondary condenser 22 is connected to the main condenser 12 through an evacuation pipe 501, and a block valve 502 and a throttle device 503 are installed on the evacuation pipe 501.
The drain heating net heater 23 is connected with a six-stage water supply pipe 161 at the front side of the six-stage low heater 16 through a drain heater water outlet pipe 235, and a seventh valve 234 is installed on the drain heater water outlet pipe 235.
A thirteen-size valve 245 is arranged on a cold source inlet of the heat supply network heater 24, a fourteen-size valve 246 is arranged on a cold source outlet, and a cold source outlet of the heat supply network heater 24 is connected with a heat supply network water supply pipe 302.
The heat supply network heater 24 is provided with a heat supply network water bypass 247, and an eighth valve 248 is installed on the heat supply network water bypass 247. The heat supply network water bypass 247 is respectively connected with the cold source inlet and the cold source outlet of the heat supply network heater 24.
The drain outlet of the heating network heater 24 is connected with the drain heating network heater 23 through a drain pipe 243, and a valve 244 No. nine is installed on the drain pipe 243.
The drain pipe 243 is connected to a fifth-stage water supply pipe 171 on the front side of the fifth-stage low-pressure heater 17 through a drain branch pipe 242, and a ten-size valve 241 is installed on the drain branch pipe 242.
The heat supply network circulating water pump 21 is installed on the heat supply network return pipe 301.
A regulating method of a heat supply network graded heating system utilizing a small steam turbine comprises the following steps:
firstly, at the initial stage or the final stage of heating, the heating heat load demand is smaller, and at the moment:
closing the first valve 403, the tenth valve 241, the ninth valve 244, the thirteenth valve 245 and the fourteenth valve 246, and stopping the operation of the heat supply network heater 24;
closing the fifth valve 232, the sixth valve 233 and the seventh valve 234, and stopping the operation of the drainage heat supply network heater 23;
opening a second valve 404, a third valve 262, a fourth valve 222, an eleventh valve 223, a twelfth valve 224 and an eighth valve 248, pumping steam of the heating steam extraction pipe 401 firstly enters a straight condensing small steam turbine 26 to do work, driving the plant generator 25 to generate power, and driving the heat supply network circulating water pump 21, the condensate pump 13 and other power consumption equipment in the plant by electric power; the return water of the heat supply network is conveyed to the secondary condenser 22 through a return water pipe 301 of the heat supply network for heating, then conveyed to a water supply pipe 302 of the heat supply network through a bypass 247 of the water of the heat supply network, and conveyed to a user for heating through the water supply pipe 302 of the heat supply network;
the drained water of the secondary condenser 22 is conveyed to a seven-stage water supply pipe 151 on the front side of the seven-stage low-pressure heater 15 through a condensed water pipe 221;
the exhaust back pressure of the straight condensing condenser 26 and the back pressure of the secondary condenser 22 are selected from 40kPa to 70kPa according to the temperature required by the water supply of the heat supply network.
Two, when the high and cold period of heating, the heating heat load demand is great, utilizes the heating to take out vapour secondary heating heat supply network water and satisfies the demand, utilizes the hydrophobic of heating steam extraction to come first heating heat supply network water simultaneously, this moment:
opening the first valve 403, the thirteenth valve 245 and the fourteenth valve 246, closing the eighth valve 248, and putting the heat supply network heater 24 into operation;
opening a second valve 404, a third valve 262, a fourth valve 222, an eleventh valve 223 and a twelfth valve 224, closing an eighth valve 248, enabling part of steam extracted by the heating steam extraction pipe 401 to enter a straight condensing small steam turbine 26 to do work, driving the plant generator 25 to generate power, driving a heat supply network circulating water pump 21, a condensate pump 13 and other power consumption equipment in the plant by electric power, conveying return water of the heat supply network to a secondary condenser 22 for primary heating through a return water pipe 301 of the heat supply network, then conveying the return water to a heater 24 of the heat supply network for secondary heating, and conveying the secondarily heated water of the heat supply network to users for heating through a water supply pipe 302 of the heat supply network;
the tenth valve 241 is closed, the ninth valve 244, the fifth valve 232, the sixth valve 233 and the seventh valve 234 are opened, the drain heat supply network heater 23 is put into operation, at the moment, drain water of the heat supply network heater 24 is conveyed to the drain heat supply network heater 23 through the drain pipe 243, meanwhile, part of return water of the heat supply network enters the drain heat supply network heater 23 for primary heating, then is mixed with the heat supply network water from the secondary condenser 22 and then enters the heat supply network heater 24 for secondary heating, and the drain water of the drain heat supply network heater 23 is conveyed to the six-stage water supply pipe 161 at the front side of the six-stage low-pressure heater 16 through the drain heater water outlet pipe 235;
when the drainage heat supply network heater 23 is not put in, the ten-stage valve 241 is opened, the nine-stage valve 244, the five-stage valve 232, the six-stage valve 233 and the seven-stage valve 234 are closed, the drainage heat supply network heater 23 stops running, and drainage of the heat supply network heater 24 is conveyed to a five-stage water supply pipe 171 at the front side of the five-stage low-pressure heater 17 through a drainage branch pipe 242;
at this time, the exhaust back pressure of the straight condenser 26 and the back pressure of the sub-condenser 22 are selected from 40 to 70kPa according to the temperature required for the grid inlet water of the grid heater 24.
During the regulation, the back pressure of the secondary condenser 22 can be ensured by two methods: firstly, opening a control switch 271, and vacuumizing the secondary condenser 22 by using a vacuumizing device 27; secondly, the closing valve 502 is opened, and after throttling is performed through the throttling device 503, the secondary condenser 22 is kept to reach the required vacuum degree by using the primary condenser 12.
In this embodiment, the adjustment method follows, in a specific operation: the secondary condenser 22 is preferably used to heat the heat supply network water, the hydrophobic heat supply network heater 23 is used to heat the heat supply network water, and the heat supply network heater 24 is finally used to heat the heat supply network water.
In the drawings of the present invention, A, B, C indicates that two identical pipes shown by the letter english are connected.
The above description is only illustrative of the structure of the present invention; moreover, the invention may also be said to consist in different parts, and all equivalent or simple variations of the constructions, features and principles described in the patent concepts are intended to be covered by the present patent.
Claims (3)
1. A regulation method of a heat supply network graded heating system utilizing a small steam turbine comprises a thermal motor set system and a heat supply system; the thermoelectric unit system comprises an extraction steam turbine, a main condenser, a condensate pump, an eight-stage low-heating heater, a seven-stage low-heating heater, a six-stage low-heating heater and a five-stage low-heating heater; the extraction steam turbine, the main condenser, the condensate pump, the eight-stage low-pressure heater, the seven-stage low-pressure heater, the six-stage low-pressure heater and the five-stage low-pressure heater are sequentially connected; the steam extraction and condensation turbine is provided with a heating steam extraction pipe; the six-stage low-pressure heater is connected with a six-stage water supply pipe; the seven-level low-pressure heater is connected with a seven-level water supply pipe; the five-stage low-pressure heater is connected with a five-stage water supply pipe; the heat supply system comprises a plant power generator, a straight condensing small steam turbine and a vacuumizing device; the plant generator is connected with the straight condensing small turbine; the method is characterized in that: the heat supply system also comprises a heat supply network return pipe, a heat supply network water supply pipe, a heat supply network circulating water pump, a secondary condenser, a drainage heat supply network heater and a heat supply network heater; the heat supply network circulating water pump is arranged on the heat supply network water return pipe; the heat supply network water return pipe is respectively connected with a cold source inlet of the secondary condenser and a cold source inlet of the drainage heat supply network heater through pipelines; an eleventh valve is arranged on a cold source inlet of the secondary condenser, a twelfth valve is arranged on a cold source outlet, and the cold source outlet of the secondary condenser is connected with the cold source inlet of the heat supply network heater; a cold source inlet of the drainage heat net heater is provided with a fifth valve, a cold source outlet is provided with a sixth valve, and the cold source outlet of the drainage heat net heater is connected with the cold source inlet of the heat net heater; a cold source inlet of the heat supply network heater is provided with a thirteen-numbered valve, a cold source outlet is provided with a fourteen-numbered valve, and the cold source outlet of the heat supply network heater is connected with a heat supply network water supply pipe; the heat supply network heater is provided with a heat supply network water bypass, and an eighth valve is arranged on the heat supply network water bypass; the heat supply network water bypass is respectively connected with a cold source inlet and a cold source outlet of the heat supply network heater; the heating steam extraction pipe is connected with a steam inlet of the heating network heater through a first steam extraction branch; the heating steam extraction pipe is also connected with a steam inlet of the straight condensing small steam turbine through a second steam extraction branch; a first valve is arranged on the first steam extraction branch, and a second valve is arranged on the second steam extraction branch; the straight condensing small steam turbine is connected with a steam inlet of the secondary steam turbine through a steam turbine exhaust pipe, and a third valve is arranged on the steam turbine exhaust pipe; the drain outlet of the secondary condenser is connected with a seven-stage water supply pipe through a condensate pipe, the drain of the secondary condenser is conveyed to the seven-stage water supply pipe on the front side of the seven-stage low-pressure heater through the condensate pipe, and a fourth valve is arranged on the condensate pipe; the drainage heat supply network heater is connected with a six-stage water supply pipe through a drainage heater water outlet pipe, and a seventh valve is arranged on the drainage heater water outlet pipe; a drain outlet of the heat supply network heater is connected with the drain heat supply network heater through a drain pipe, and a No. nine valve is arranged on the drain pipe; the drain pipe is connected with the five-stage water supply pipe through a drain branch pipe, and a No. ten valve is arranged on the drain branch pipe; the vacuumizing device is connected with the secondary condenser through a pipeline, and a control switch is arranged on the pipeline;
the adjusting method of the heat supply network graded heating system using the small steam turbine comprises the following steps:
firstly, in the initial stage or the final stage of heating, the heating heat load demand is smaller, and at the moment:
closing the first valve, the tenth valve, the ninth valve, the thirteenth valve and the fourteenth valve, and stopping the operation of the heat supply network heater;
closing the fifth valve, the sixth valve and the seventh valve, and stopping the operation of the drainage heat supply network heater;
opening a second valve, a third valve, a fourth valve, an eleventh valve, a twelfth valve and an eighth valve, enabling the steam of the heating steam extraction pipe to enter a straight condensing small steam turbine for acting, driving a plant generator to generate power, and driving a heat supply network circulating water pump and a condensate pump by electric power; the return water of the heat supply network is conveyed to the secondary condenser for heating through a return water pipe of the heat supply network, then conveyed to a water supply pipe of the heat supply network through a bypass of the water of the heat supply network, and conveyed to a user for heating through the water supply pipe of the heat supply network;
the drain water of the secondary condenser is conveyed to a seven-stage water supply pipe on the front side of the seven-stage low-pressure heater through a condensed water pipe;
the exhaust back pressure of the straight condensing small condenser and the back pressure of the secondary condenser are selected between 40kPa and 70kPa according to the temperature required by the water supply of the heat supply network;
secondly, when the high and cold period of heating, the heating heat load demand is great, this moment:
opening the first valve, the thirteen valve and the fourteen valve, closing the eighth valve, and putting the heat supply network heater into operation;
opening a second valve, a third valve, a fourth valve, an eleventh valve and a twelfth valve, closing an eighth valve, enabling the steam extracted by the heating steam extraction pipe to enter a straight condensing small steam turbine for acting, driving a plant generator to generate electricity, driving a heat supply network circulating water pump and a condensate pump by electric power, conveying the heat supply network return water to a secondary condenser for primary heating through a heat supply network return water pipe, then conveying the heat supply network return water to a heat supply network heater for secondary heating, and conveying the secondarily heated heat supply network water to a user for heating through a heat supply network water supply pipe;
closing the tenth valve, opening the ninth valve, the fifth valve, the sixth valve and the seventh valve, putting the drainage heat supply network heater into operation, conveying drainage of the heat supply network heater to the drainage heat supply network heater through a drainage pipe, simultaneously, allowing partial return water of the heat supply network to enter the drainage heat supply network heater for primary heating, mixing the drainage water with heat supply network water from the secondary condenser, then allowing the mixture to enter the heat supply network heater for secondary heating, and conveying drainage of the drainage heat supply network heater to a six-stage water supply pipe on the front side of a six-stage low-pressure heater through a drainage heater water outlet pipe;
when the drainage heat supply network heater is not put into use, the tenth valve is opened, the ninth valve, the fifth valve, the sixth valve and the seventh valve are closed, the drainage heat supply network heater stops running, and drainage of the heat supply network heater is conveyed to a fifth-stage water supply pipe on the front side of the fifth-stage low-pressure heater through the drainage branch pipe;
the exhaust back pressure of the straight condensing small steam turbine and the back pressure of the secondary condenser are selected between 40kPa and 70kPa according to the temperature required by the water inlet of the heat supply network heater.
2. The method for adjusting a heating network staged heating system using a small steam turbine as set forth in claim 1, wherein: the secondary condenser is also connected with the main condenser through a vacuum tube, and the vacuum tube is provided with a block valve and a throttling device.
3. The method for adjusting a heating network staged heating system using a small steam turbine as set forth in claim 1, wherein: the secondary condenser is connected with the drainage heat supply network heater in parallel and then connected with the heat supply network heater in series.
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| CN107542506B (en) * | 2017-08-23 | 2024-04-09 | 华电电力科学研究院有限公司 | Cascade utilization system for extraction condensing back of steam turbine and application thereof |
| CN108506057B (en) * | 2018-03-01 | 2023-07-14 | 华电电力科学研究院有限公司 | Cogeneration system for cutting off steam inlet of low-pressure cylinder and adjusting method |
| CN109854316B (en) * | 2019-02-02 | 2023-09-08 | 华电电力科学研究院有限公司 | Combined cycle heat supply and power peak regulation coupling system based on energy cascade utilization and operation method thereof |
| CN111765507B (en) * | 2020-05-18 | 2021-07-27 | 华电电力科学研究院有限公司 | Improved heat supply initial station system and working method thereof |
| CN114963286B (en) * | 2022-06-21 | 2024-03-19 | 中冶焦耐(大连)工程技术有限公司 | Process for supplying heating water by using dry quenching waste heat power generation |
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| JPH094415A (en) * | 1995-06-19 | 1997-01-07 | Mitsubishi Heavy Ind Ltd | Steam turbine condensation system |
| DE19630058B4 (en) * | 1996-07-25 | 2010-12-16 | Ormat Industries, Ltd. | Seasonally configurable combined heat and power plant |
| DE10032625C1 (en) * | 2000-07-07 | 2001-08-02 | Mvv En Ag | Method and device for the simultaneous generation of hot and hot gas by means of combined heat and power |
| KR100849578B1 (en) * | 2007-11-20 | 2008-07-31 | 두산건설 주식회사 | High efficient energy saving type heating system using integrated assistant heat source means |
| CN203454250U (en) * | 2013-09-16 | 2014-02-26 | 北京国电德安电力工程有限公司 | Combined heat supply unit system |
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