CN112762499A - Heating method for intelligently adjusting gradient utilization of waste steam upgrading heat energy - Google Patents
Heating method for intelligently adjusting gradient utilization of waste steam upgrading heat energy Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 70
- 239000002699 waste material Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 abstract description 13
- 230000004048 modification Effects 0.000 abstract description 13
- 230000009466 transformation Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000010793 Steam injection (oil industry) Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
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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
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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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Abstract
The invention provides a heating method for intelligently adjusting waste steam upgrading heat energy gradient utilization, which comprises the following steps: the return water of the heat supply network enters a steam turbine condenser or a high back pressure steam condenser of the steam turbine, and the heat of the steam discharged by a low pressure cylinder of the steam turbine is utilized to carry out primary heating on the return water of the heat supply network; the waste steam upgrading heat energy cascade utilization heating assembly utilizes the exhaust steam in the steam turbine to inject the exhaust of the low-pressure cylinder and carries out secondary heating on the backwater of the heat supply network; carrying out third-stage heating on the return water of the heat supply network by using the exhaust steam in the steam turbine; the invention can be better matched with high back pressure modification, so that the high back pressure modification is not limited by the circulating water quantity of a heat supply network, more latent heat of dead steam of the steam turbine is recovered, the cold end loss is reduced, the use of high-quality steam is saved, the heat economy of a power plant is improved, and the application range of the high back pressure modification is expanded.
Description
Technical Field
The invention relates to the field of exhaust steam recovery heating, in particular to a heating method for intelligently adjusting exhaust steam upgrading heat energy and realizing cascade utilization.
Background
The cold end loss of a thermal power plant is the maximum loss of a thermodynamic system of the power plant, and the energy-saving technical idea of centralized heating and gradient utilization of heat energy is embodied by the waste steam recovery heating transformation; the method conforms to the key development technical category of energy conservation and comprehensive utilization of resources. The combined heat and power generation is adopted as the support of the heat source, and the steam exhaust recovery and the upgrading heat supply modification of the power plant unit meet the relevant national industrial policies.
After the steam turbine set is transformed by high back pressure, the back pressure can be increased to 0.04-0.054 MPa, the safety of the steam turbine and auxiliary machines thereof is not greatly influenced, and the temperature of a cooling water outlet can reach 72-80 ℃. The following problems also exist:
(1) because the exhaust steam volume is large and the water volume of the heating network is limited, double water sources are still needed, namely, the circulating water of the heating network and the circulating cooling water of the original steam turbine operate together to cool and exhaust steam.
(2) Under the condition of large heat load, in order to ensure the temperature of the circulating water of the heat supply network, the circulating water of the heat supply network is heated in the heat supply network heater by using the middle exhaust steam, so that the circulating water of the heat supply network meets the requirement of heat supply temperature.
(3) For the unit after high back pressure transformation, the back pressure is improved too much, which greatly improves the coal consumption of the unit and also affects the safety of the steam turbine equipment and the auxiliary machines thereof.
(4) The backpressure heating load of the steam turbine is determined, and the load of the unit cannot be flexibly adjusted.
(5) The recovery steam quantity is smaller when the water supply quantity of the heat supply network is small, and the investment recovery period is long, so the modification willingness of the power plant is low.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an intelligent adjustment steam exhaust upgrading heat energy cascade utilization heating method which can be better matched with high back pressure transformation, so that the high back pressure transformation is not limited by the quantity of circulating water of a heat supply network, further more latent heat of steam exhaust of a steam turbine is recovered, the loss of a cold end is reduced, the use of high-quality steam is saved, the heat economy of a power plant is improved, and the application range of the high back pressure transformation is expanded.
In order to achieve the purpose, the invention adopts the following technical scheme:
an intelligent regulation exhaust steam upgrading heat energy cascade utilization heating method comprises the following steps:
s100, first-stage heating: the method comprises the following steps that return water of a heat supply network enters a steam turbine condenser or a steam turbine high back pressure condenser, and the heat of steam exhausted by a steam turbine low pressure cylinder is utilized to carry out primary heating on the return water of the heat supply network in the steam turbine condenser or the steam turbine high back pressure condenser;
s200, second-stage heating: the waste steam upgrading heat energy cascade utilization heating assembly utilizes the exhaust steam in the steam turbine to inject the exhaust of the low-pressure cylinder, and the heat exchange is used for carrying out secondary heating on the backwater of the heat supply network;
s300, third-stage heating: and (4) utilizing the discharged steam in the steam turbine and carrying out third-stage heating on the return water of the heat supply network through the heat supply network heater.
S400, intelligent control: and regulating the three-stage heating by using a regulating mechanism through a corresponding control system, and outputting heating return water with a preset temperature to a user pipeline at a three-stage heating output end.
In a preferred embodiment of the present invention, in step S100, the turbine and the turbine condenser or the turbine high back pressure condenser are connected through a low pressure cylinder exhaust connection device, and the low pressure cylinder exhaust connection device is used for conveying low pressure cylinder exhaust and detecting low pressure cylinder exhaust pressure.
In a preferred embodiment of the invention, in step S200, the waste steam upgrading thermal energy cascade utilization heating assembly comprises a venturi device and a heat exchanger connected with the jet orifice of the venturi device, the power steam inlet of the Venturi device is connected with the middle exhaust steam of the steam turbine through a middle exhaust steam gate valve and a middle exhaust steam butterfly valve in sequence, the suction port of the Venturi device is connected with the low-pressure cylinder exhaust connecting device through a suction port pipeline, and the suction port pipeline is sequentially provided with a steam exhaust pipeline gate valve and a steam exhaust pipeline butterfly valve, the venturi device is provided with a control mechanism for controlling the output quantity of the venturi device, the heat exchanger water inlet pipeline is connected with a heat supply network water return pipeline through the turbine condenser or the turbine high back pressure condenser, and a backwater inlet temperature measuring device is arranged on the heat supply network backwater pipeline, and the drain end of the heat exchanger is connected with the steam turbine condenser or the steam turbine high back pressure condenser.
In a preferred embodiment of the present invention, in step S300, a valve is disposed between the heat supply network heater and the exhaust steam in the steam turbine, and a temperature measuring device for a return water outlet is disposed at an output end of the heat supply network heater.
In a preferred embodiment of the present invention, in step S400, the corresponding control system is configured to obtain the temperature of the return water inlet and outlet of the heat supply network and the exhaust pressure of the low-pressure cylinder, and control the output of the three-stage heating through a valve.
Through the technical scheme, the invention has the following beneficial effects:
(1) the steam turbine low-pressure cylinder exhaust steam injection device is reasonable in design, exhaust steam in the steam turbine is adopted to inject exhaust steam of the low-pressure cylinder, the three-level heating is utilized to heat circulating water of the heat supply network, and the device can be better matched with high back pressure transformation, so that more steam exhaust latent heat of the steam turbine is further recovered, steam with proper pressure for heating the circulating water of the heat supply network is obtained, the use amount of the exhaust steam in high quality is saved, energy loss is avoided, and the heat economy of a power plant is greatly improved.
(2) The invention has reasonable design, can automatically adjust the pressure, the temperature and the flow of the steam for heating the heat supply network water according to the requirements of users, further controls and adjusts the water supply temperature of the heat supply network water, has no rotating equipment in the whole system, does not need maintenance, has long safe operation period, solves the problem that the high back pressure modification is limited by the circulating water quantity of the heat supply network, and optimizes the defects that the back pressure is limited by the water quantity and can not be flexibly adjusted.
(3) The invention has reasonable design, and the pressure and temperature of the middle exhaust steam and the low pressure cylinder exhaust steam are moderate, so the requirements on pipelines and valves are lower, the cost and the maintenance amount are reduced, the safety of the whole system is increased, and the application range of high back pressure modification is enlarged.
Drawings
FIG. 1 is a flow chart of a heating method for intelligently adjusting waste steam upgrading heat energy cascade utilization according to the invention;
FIG. 2 is a system structure diagram of the heating method for intelligently adjusting the waste steam upgrading heat energy cascade utilization.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
As shown in fig. 1 and 2, the invention discloses a heating method for intelligently adjusting waste steam upgrading heat energy cascade utilization, which comprises the following steps:
s100, first-stage heating: the return water of the heat supply network enters a steam turbine condenser or a steam turbine high back pressure condenser 2, and the heat discharged by the low pressure cylinder of the steam turbine 1 is utilized to carry out primary heating on the return water of the heat supply network in the steam turbine condenser or the steam turbine high back pressure condenser 2. In this step, the steam turbine 1 and the steam turbine condenser or the steam turbine high back pressure condenser 2 are connected through the low pressure cylinder exhaust connecting device 5, and the low pressure cylinder exhaust connecting device 5 is used for conveying low pressure cylinder exhaust steam and detecting low pressure cylinder exhaust pressure.
S200, second-stage heating: the waste steam upgrading heat energy cascade utilization heating assembly 3 utilizes the steam exhausted from the steam turbine 1 to inject the low-pressure cylinder for exhaust, and the heat supply network backwater is subjected to secondary heating through heat exchange. In this step, the exhaust steam upgrading heat energy cascade utilization heating component 3 comprises a venturi device 16 and a heat exchanger 7 connected with a jet orifice of the venturi device 16, a power steam inlet of the venturi device 16 is connected with the exhaust steam in the steam turbine 1 through a middle exhaust steam gate valve 8 and a middle exhaust steam butterfly valve 9 in sequence, a suction port of the venturi device 16 is connected with the low-pressure cylinder exhaust connecting device 5 through a suction port pipeline 6, an exhaust steam pipeline gate valve 10 and an exhaust steam pipeline butterfly valve 11 are sequentially arranged on the suction port pipeline 6, a control mechanism 15 for controlling the output quantity of the venturi device 16 is installed on the venturi device 16, a water inlet pipeline of the heat exchanger 7 is connected with a heat supply network water return pipeline through the steam turbine condenser or the steam turbine high-back-pressure condenser 2, and a water return inlet temperature measuring device 13 is arranged on the heat supply network water return pipeline, and the water drainage end of the heat exchanger 7 is connected with the steam turbine condenser or the steam turbine high back pressure condenser 2.
S300, third-stage heating: and (3) utilizing the exhausted steam in the steam turbine 1 and carrying out third-stage heating on the return water of the heat supply network through a heat supply network heater 12. In this step, a valve 17 is arranged between the heat supply network heater 12 and the exhaust steam in the steam turbine 1, and a backwater outlet temperature measuring device 14 is arranged at the output end of the heat supply network heater 12. When the return water of the heat supply network does not meet the user requirement after being heated by the first two stages, the third stage heating valve 17 is opened to be large, the steam flow of the heat supply network heater 12 is increased, and the temperature of the return water of the heat supply network is continuously raised by utilizing the exhaust steam in the steam turbine 1 until the user requirement is met.
S400, intelligent control: and regulating the three-stage heating by using a regulating mechanism through a corresponding control system 4, and outputting the return water of the heat supply network with the preset temperature to a user pipeline at the three-stage heating output end. In this step, the corresponding control system 4 is used for acquiring the temperature of the return water of the heat supply network and the exhaust pressure of the low-pressure cylinder, and controlling the output of the three-level heating through a valve.
When the method is applied specifically, the intelligent adjustment gradient utilization and transformation method for the exhaust steam upgrading heat energy is suitable for a wet cooling unit and various air cooling units.
The specific intelligent regulation principle is as follows:
a power steam inlet pipeline of the Venturi device 16 is connected with middle exhaust steam of the steam turbine 1, a middle exhaust steam gate valve 8 and a middle exhaust steam butterfly valve 9 are arranged on the pipeline, and the middle exhaust steam butterfly valve 9 is connected with the corresponding control system 4 to realize the flow regulation of the power steam; a suction port of the venturi device 16 is connected with the low-pressure cylinder exhaust connecting device 5, a waste steam pipeline gate valve 10 and a waste steam pipeline butterfly valve 11 are arranged on a pipeline, and the waste steam pipeline butterfly valve 11 is also connected to the corresponding control system 4 to realize the regulation of the pressure and the flow of the waste steam; the outlet of the venturi device 16 is connected to the inlet pipeline of the heat exchanger 7, a backwater inlet temperature measuring device 13 and a backwater outlet temperature measuring device 14 are arranged on the heat supply network backwater pipeline on the heat exchanger 7, and the adjustment of the steam flow is realized by monitoring the temperature of the backwater inlet and the backwater outlet of the heat supply network and feeding back signals to the corresponding control system 4.
The system adopts an internal-external combined adjusting mechanism to control the actual water supply temperature of the circulating water of the heat supply network. A backwater inlet temperature measuring device 13 and a backwater outlet temperature measuring device 14 are arranged on a backwater and water supply pipeline of the circulating water of the heat supply network, when the water supply temperature of the heat supply network is reduced, the backwater outlet temperature measuring device 14 feeds back the temperature change condition to the corresponding control system 4, and then the corresponding control system 4 sends out an adjusting instruction, so that a control mechanism 15 of the Venturi device 16 is opened, the output of the Venturi device 16 is increased, the temperature of the heat supply network returns to a normal value, and the temperature returns to a normal value. Conversely, automatic adjustment can be realized as well. When the temperature of the return water of the heat supply network is reduced, the temperature change condition of the return water inlet temperature measuring device 13 is fed back to the corresponding control system 4, and then the corresponding control system 4 sends out an adjusting instruction to open the control mechanism 15 of the Venturi device 16, so that the output of the Venturi device 16 is increased, the temperature of the heat supply network is returned to a normal value, and the temperature is recovered to be normal. Conversely, automatic adjustment can be realized as well.
When the pressure of the middle exhaust steam and the exhaust steam of the low-pressure cylinder is increased, the calculation program of the corresponding control system 4 can automatically analyze and calculate according to the change trend of the pressure, the flow and the temperature of the middle exhaust steam and the exhaust steam of the low-pressure cylinder, so as to give an adjusting instruction. Under the combined cooperation of the middle exhaust steam pipeline, the middle exhaust steam butterfly valve 9 and the control mechanism 15 of the Venturi device 16, the pressure, the temperature and the flow of the steam at the outlet of the Venturi device 16 are ensured, so that the requirement of a heat user on the temperature of the heat supply network water is met.
The practical effect of the invention will be explained by taking the practical application of the power plant as an example. The invention is applied to a power plant, the economic benefit is calculated by taking the circulating water flow of a heat supply network as 7000t/h, the water supply temperature as 90 ℃ and the return water temperature as 45 ℃, the enthalpy value of the medium-exhaust steam ratio is 3158kJ/kg and the specific enthalpy value of the low-pressure cylinder exhaust steam is 2632kJ/kg by taking a 75% THA working condition as an example, and the steam consumption is 516t/h when the original medium-exhaust steam is used as a heat supply network water heating steam source.
| Amount of water | t/h | 7000 |
| Temperature of return water | ℃ | 45 |
| Outlet temperature | ℃ | 90 |
| Middle steam discharge | t/h | 515.54 |
| Medium discharge of latent heat of steam | kJ/kg | 2554 |
When the steam matched with the invention is used as a steam source for heating the water in the heat supply network, and the steam injection coefficient is calculated to be 0.7 according to the formula, 455t/h of the exhaust steam of the low-pressure cylinder is recovered, and the consumption of the medium-discharge steam is 110 t/h.
The steam matched with the invention and the middle exhaust steam are used as steam sources for heating water of a heat supply network, and for a unit which is transformed by high back pressure, after the unit is transformed by additionally arranging a Venturi device for heating, the recovered latent heat of the exhaust steam is converted into the saved standard coal amount of 6.42t/h, and the coal saving income is about 1248 ten thousand yuan calculated according to the average 150 days in a heating season. For a unit which is not subjected to high back pressure modification, after the venturi device is additionally arranged while the high back pressure modification is carried out, the recovered dead steam latent heat is converted into the standard coal saving amount of 37.9t/h, and the coal saving income is about 7368 ten thousand yuan calculated according to the average 150 days in a heating season.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the steam turbine low-pressure cylinder exhaust steam injection device is reasonable in design, exhaust steam in the steam turbine is adopted to inject exhaust steam of the low-pressure cylinder, the three-level heating is utilized to heat circulating water of the heat supply network, and the device can be better matched with high back pressure transformation, so that more steam exhaust latent heat of the steam turbine is further recovered, steam with proper pressure for heating the circulating water of the heat supply network is obtained, the use amount of the exhaust steam in high quality is saved, energy loss is avoided, and the heat economy of a power plant is greatly improved.
(2) The invention has reasonable design, can automatically adjust the pressure, the temperature and the flow of the steam for heating the heat supply network water according to the requirements of users, further controls and adjusts the water supply temperature of the heat supply network water, has no rotating equipment in the whole system, does not need maintenance, has long safe operation period, solves the problem that the high back pressure modification is limited by the circulating water quantity of the heat supply network, and optimizes the defects that the back pressure is limited by the water quantity and can not be flexibly adjusted.
(3) The invention has reasonable design, and the pressure and temperature of the middle exhaust steam and the low pressure cylinder exhaust steam are moderate, so the requirements on pipelines and valves are lower, the cost and the maintenance amount are reduced, the safety of the whole system is increased, and the application range of high back pressure modification is enlarged.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (4)
1. An intelligent regulation exhaust steam upgrading heat energy cascade utilization heating method is characterized by comprising the following steps:
s100, first-stage heating: the method comprises the following steps that return water of a heat supply network enters a steam turbine condenser or a steam turbine high back pressure condenser, and the heat of steam exhausted by a steam turbine low pressure cylinder is utilized to carry out primary heating on the return water of the heat supply network in the steam turbine condenser or the steam turbine high back pressure condenser;
s200, second-stage heating: the waste steam upgrading heat energy cascade utilization heating assembly utilizes the exhaust steam in the steam turbine to inject the exhaust of the low-pressure cylinder, and the heat exchange is used for carrying out secondary heating on the backwater of the heat supply network;
s300, third-stage heating: and (4) utilizing the discharged steam in the steam turbine and carrying out third-stage heating on the return water of the heat supply network through the heat supply network heater.
S400, intelligent control: and regulating the three-stage heating by using a regulating mechanism through a corresponding control system, and outputting heating return water with a preset temperature to a user pipeline at a three-stage heating output end.
2. The heating method according to claim 1, wherein in step S200, the heating component for upgrading waste steam comprises a Venturi device and a heat exchanger connected with the jet orifice of the Venturi device, the power steam inlet of the Venturi device is connected with the medium steam exhaust of the steam turbine through a medium steam exhaust gate valve and a medium steam exhaust butterfly valve in sequence, the suction port of the Venturi device is connected with the low-pressure cylinder exhaust connecting device through a suction port pipeline, a waste steam pipeline gate valve and a waste steam pipeline butterfly valve are sequentially arranged on the suction port pipeline, the Venturi device is provided with a control mechanism for controlling the output quantity of the venturi device, and the water inlet pipeline of the heat exchanger is connected with a hot network water return pipeline through the steam turbine condenser or the high-back-pressure steam turbine condenser, and a backwater inlet temperature measuring device is arranged on the heat supply network backwater pipeline, and the drain end of the heat exchanger is connected with the steam turbine condenser or the steam turbine high back pressure condenser.
3. The heating method of claim 1, wherein in step S300, a valve is disposed between the heat supply network heater and the exhaust steam in the steam turbine, and a temperature measuring device is disposed at an output end of the heat supply network heater.
4. The intelligent regulated waste steam upgraded heat energy cascade heating method as claimed in claim 1, wherein in step S400, the corresponding control system is used for obtaining the temperature of the backwater inlet and outlet of the heat supply network and the exhaust pressure of the low-pressure cylinder and controlling the output of the three-stage heating through a valve.
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| CN114810249A (en) * | 2022-04-07 | 2022-07-29 | 西安热工研究院有限公司 | Thermoelectric decoupling system and method for heat supply unit |
| CN114810249B (en) * | 2022-04-07 | 2024-02-20 | 西安热工研究院有限公司 | Thermoelectric decoupling system and method for heat supply unit |
| CN115095898A (en) * | 2022-06-01 | 2022-09-23 | 华能国际电力股份有限公司上安电厂 | Heat supply system economic operation analysis method based on exhaust steam condenser |
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