CN114076303A - System and method for heating condensed water of main engine by using waste heat of steam condensed water externally supplied by industrial heat supply - Google Patents
System and method for heating condensed water of main engine by using waste heat of steam condensed water externally supplied by industrial heat supply Download PDFInfo
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- CN114076303A CN114076303A CN202111219231.8A CN202111219231A CN114076303A CN 114076303 A CN114076303 A CN 114076303A CN 202111219231 A CN202111219231 A CN 202111219231A CN 114076303 A CN114076303 A CN 114076303A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000002918 waste heat Substances 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004065 wastewater treatment Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
- F22D5/34—Applications of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a system and a method for heating condensed water of a host by using waste heat of steam condensed water supplied by industrial heat supply, belonging to the field of heat and power cogeneration heat supply, wherein the system comprises a low-pressure cylinder, a condenser, a condensed water pump, a first low-pressure heater, a second low-pressure heater, a third low-pressure heater, a pipeline pump and a heat exchanger; the invention recovers the waste heat of the externally supplied steam condensate by adding the heat exchanger, heats the temperature of the condensate of the main engine, reduces the steam extraction amount of the low-pressure heater, reduces the coal consumption of the unit for generating electricity, improves the heat efficiency of the unit and achieves the effects of energy saving and carbon reduction. Meanwhile, according to the temperature aligning principle, the condensed water of the main machine after heat exchange is led to different positions, so that a greater energy-saving effect is realized. The invention has the advantages of reasonable design, simple modification, reliable performance and higher practical application value.
Description
Technical Field
The invention belongs to the field of cogeneration heat supply, and particularly relates to a system and a method for heating condensed water of a main machine by using waste heat of steam condensed water externally supplied by industrial heat supply.
Background
The industrial heat supply means that steam generated by a boiler or steam which has already done work is conveyed outwards after a heat and power cogeneration unit is technically improved and is provided for heat users to serve as a production driving heat source. The method is limited by the influence of factors such as a steam utilization mode, a long conveying distance, and the quality of steam condensate cannot be guaranteed, and the steam condensate is generally not considered in the thermal power plant. However, for the steam with a short conveying distance, the temperature of the steam condensate is generally 80-120 ℃ by adopting a heat exchanger indirect utilization mode, and the steam condensate can still keep a certain temperature after being conveyed to a thermal power plant.
After being sent out from a condensate pump, the condensate of the main engine of the thermal power plant passes through a multi-stage low-pressure heater successively, the temperature is raised by utilizing steam extraction of each stage of a steam turbine and then is conveyed to a deaerator, and the temperature of the condensate is generally 35-140 ℃.
In order to reduce the steam extraction amount of the low-pressure heater, the method utilizes the externally supplied steam condensate with higher temperature to heat the main condensate, thereby achieving the purposes of improving the heat efficiency of the unit, reducing the coal consumption of power generation and realizing energy saving and carbon reduction.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a system and a method for heating condensed water of a main engine by using waste heat of steam condensed water supplied from an industrial heat supply, which can reduce the steam extraction amount of a low-pressure heater by recovering the waste heat to achieve the effects of energy saving and carbon reduction.
The technical scheme adopted by the invention for solving the problems is as follows: a system for heating condensed water of a host by using waste heat of steam condensed water supplied by industrial heat supply is characterized by comprising a low-pressure cylinder, a condenser, a condensed water pump, a first low-pressure heater, a second low-pressure heater, a third low-pressure heater, a pipeline pump and a heat exchanger; the low-pressure cylinder is connected with a condenser, the condenser is connected with an inlet of a condensate pump, an outlet of the condensate pump is connected to a cold end inlet of a first low-pressure heater, a cold end outlet of the first low-pressure heater is connected to a cold end inlet of a second low-pressure heater, and a cold end outlet of the second low-pressure heater is connected to a cold end inlet of a third low-pressure heater; a cold end inlet of the heat exchanger is connected with an outlet of the condensate pump, and a cold end outlet of the heat exchanger is respectively connected with a cold end inlet of the first low-pressure heater, a cold end inlet of the second low-pressure heater and a cold end inlet of the third low-pressure heater; the pipeline pump is used for conveying externally supplied steam condensate water, a hot end inlet of the heat exchanger is connected with an outlet of the pipeline pump, and a hot end outlet of the heat exchanger is connected to a wastewater treatment system.
Furthermore, a first valve is arranged between the outlet of the condensed water pump and the cold end inlet of the first low-pressure heater, and a second valve is arranged between the outlet of the condensed water pump and the cold end inlet of the heat exchanger.
Furthermore, a third valve, a fourth valve and a fifth valve are respectively arranged between the cold end outlet of the heat exchanger and the cold end inlet of the first low-pressure heater, the cold end inlet of the second low-pressure heater and the cold end inlet of the third low-pressure heater, a sixth valve is arranged between the hot end inlet of the heat exchanger and the pipeline pump, and a seventh valve is arranged between the hot end outlet of the heat exchanger and the wastewater treatment system.
The working method comprises the following steps:
opening a sixth valve and a seventh valve, conveying the externally supplied steam condensate to the heat exchanger by the pipeline pump to heat the condensate of the main machine, and collecting the externally supplied steam condensate after heat exchange into a wastewater treatment system for treatment;
opening the first valve and the second valve, respectively conveying the condensed water of the main machine to the heat exchanger and the first low-pressure heater by the condensed water pump for heat exchange, and controlling the opening distribution of the first valve and the second valve to adjust the amount of the condensed water entering the first low-pressure heater and the heat exchanger;
and the condensed water of the main machine heated by the heat exchanger is respectively conveyed to the cold end inlet of the first low-pressure heater, the cold end inlet of the second low-pressure heater and the cold end inlet of the third low-pressure heater through pipelines.
If the temperature of the condensed water of the main engine after heat exchange of the heat exchanger is close to the temperature of the cold-end inlet of the first low-pressure heater, opening the third valve, and closing the fourth valve and the fifth valve to enable the condensed water of the main engine to converge into the cold-end inlet of the first low-pressure heater; if the temperature of the condensed water of the main engine after heat exchange of the heat exchanger is close to the temperature of the cold-end inlet of the second low-pressure heater, opening the fourth valve, closing the third valve and the fifth valve, and enabling the condensed water of the main engine to converge into the cold-end inlet of the second low-pressure heater; and if the temperature of the condensed water of the main engine after heat exchange of the heat exchanger is close to the temperature of the cold-end inlet of the third low-pressure heater, opening the fifth valve, and closing the third valve and the fourth valve to enable the condensed water of the main engine to converge into the cold-end inlet of the third low-pressure heater.
Compared with the prior art, the invention has the following advantages and effects: (1) the invention has reasonable design, simple modification and reliable performance, and creates a system for heating the condensed water of the main engine by using the waste heat of the condensed water of the steam supplied from the outside of the industrial heat supply; (2) the invention can recover the waste heat of the condensed water of the externally supplied steam, and the condensed water of the externally supplied steam exchanges heat with the condensed water of the main machine, thereby improving the temperature of the condensed water of the main machine, reducing the steam extraction of the low-pressure heater, improving the heat efficiency of the unit, reducing the coal consumption of the unit for generating electricity and achieving the effects of energy saving and carbon reduction. (3) According to the invention, the condensed water of the main machine after heat exchange is led to different positions according to the temperature aligning principle, so that a greater energy-saving effect is realized.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
In the figure: the system comprises a low-pressure cylinder 1, a condenser 2, a condensate pump 3, a first valve 4, a first low-pressure heater 5, a second low-pressure heater 6, a third low-pressure heater 7, a second valve 8, a third valve 9, a fourth valve 10, a fifth valve 11, a pipeline pump 12, a sixth valve 13, a heat exchanger 14 and a seventh valve 15.
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.
Examples are given.
Referring to fig. 1, in the present embodiment, a system for heating condensed water of a host by using waste heat of condensed water of steam supplied from an external industrial heat supply includes a low-pressure cylinder 1, a condenser 2, a condensed water pump 3, a first low-pressure heater 5, a second low-pressure heater 6, a third low-pressure heater 7, a pipeline pump 12, and a heat exchanger 14; the low-pressure cylinder 1 is connected with a condenser 2, the condenser 2 is connected with an inlet of a condensate pump 3, an outlet of the condensate pump 3 is connected with a cold end inlet of a first low-pressure heater 5, a cold end outlet of the first low-pressure heater 5 is connected with a cold end inlet of a second low-pressure heater 6, and a cold end outlet of the second low-pressure heater 6 is connected with a cold end inlet of a third low-pressure heater 7; a cold-end inlet of the heat exchanger 14 is connected with an outlet of the condensate pump 3, and a cold-end outlet of the heat exchanger 14 is respectively connected with a cold-end inlet of the first low-pressure heater 5, a cold-end inlet of the second low-pressure heater 6 and a cold-end inlet of the third low-pressure heater 7; the pipeline pump 12 is used for conveying condensed water of externally supplied steam, a hot end inlet of the heat exchanger 14 is connected with an outlet of the pipeline pump 12, and a hot end outlet of the heat exchanger 14 is connected to a wastewater treatment system.
A first valve 4 is arranged between the outlet of the condensate pump 3 and the cold-end inlet of the first low-pressure heater 5, and a second valve 8 is arranged between the outlet of the condensate pump 3 and the cold-end inlet of the heat exchanger 14.
A third valve 9, a fourth valve 10 and a fifth valve 11 are respectively arranged between the cold end outlet of the heat exchanger 14 and the cold end inlet of the first low-pressure heater 5, between the cold end inlet of the second low-pressure heater 6 and between the cold end inlet of the third low-pressure heater 7, a sixth valve 13 is arranged between the hot end inlet of the heat exchanger 14 and the pipeline pump 12, and a seventh valve 15 is arranged between the hot end outlet of the heat exchanger 14 and the wastewater treatment system.
The working method comprises the following steps:
opening a sixth valve 13 and a seventh valve 15, conveying the externally supplied steam condensate to a heat exchanger 14 by a pipeline pump 12 to heat the main machine condensate, and collecting the externally supplied steam condensate after heat exchange into a wastewater treatment system for treatment;
opening a first valve 4 and a second valve 8, respectively conveying the condensed water of the main machine to a heat exchanger 14 and a first low-pressure heater 5 by a condensed water pump 3 for heat exchange, and controlling the opening distribution of the first valve 4 and the second valve 8 to adjust the amount of the condensed water entering the first low-pressure heater 5 and the heat exchanger 14;
the condensed water of the main machine heated by the heat exchanger 14 is respectively conveyed to the cold-end inlet of the first low-pressure heater 5, the cold-end inlet of the second low-pressure heater 6 and the cold-end inlet of the third low-pressure heater 7 through pipelines.
If the temperature of the condensed water of the main engine after heat exchange by the heat exchanger 14 is close to the temperature of the cold-end inlet of the first low-pressure heater 5, opening the third valve 9, and closing the fourth valve 10 and the fifth valve 11, so that the condensed water of the main engine is converged into the cold-end inlet of the first low-pressure heater 5; if the temperature of the condensed water of the main engine after heat exchange by the heat exchanger 14 is close to the temperature of the cold-end inlet of the second low-pressure heater 6, opening the fourth valve 10, and closing the third valve 9 and the fifth valve 11, so that the condensed water of the main engine is converged into the cold-end inlet of the second low-pressure heater 6; and if the temperature of the condensed water of the main engine after heat exchange by the heat exchanger 14 is close to the temperature of the cold-end inlet of the third low-pressure heater 7, opening the fifth valve 11, and closing the third valve 9 and the fourth valve 10 to enable the condensed water of the main engine to be converged into the cold-end inlet of the third low-pressure heater 7.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. A system for heating condensed water of a main engine by using waste heat of steam condensed water supplied by industrial heat supply is characterized by comprising a low-pressure cylinder (1), a condenser (2), a condensed water pump (3), a first low-pressure heater (5), a second low-pressure heater (6), a third low-pressure heater (7), a pipeline pump (12) and a heat exchanger (14); the low-pressure cylinder (1) is connected with a condenser (2), the condenser (2) is connected with an inlet of a condensate pump (3), an outlet of the condensate pump (3) is connected with a cold-end inlet of a first low-pressure heater (5), a cold-end outlet of the first low-pressure heater (5) is connected with a cold-end inlet of a second low-pressure heater (6), and a cold-end outlet of the second low-pressure heater (6) is connected with a cold-end inlet of a third low-pressure heater (7); a cold end inlet of the heat exchanger (14) is connected with an outlet of the condensate pump (3), and a cold end outlet of the heat exchanger (14) is respectively connected with a cold end inlet of the first low-pressure heater (5), a cold end inlet of the second low-pressure heater (6) and a cold end inlet of the third low-pressure heater (7); the pipeline pump (12) is used for conveying externally supplied steam condensate water, a hot end inlet of the heat exchanger (14) is connected with an outlet of the pipeline pump (12), and a hot end outlet of the heat exchanger (14) is connected to a wastewater treatment system.
2. The system for heating the condensed water of the main engine by using the waste heat of the steam condensed water supplied by the industrial heat supply system as claimed in claim 1, wherein a first valve (4) is arranged between the outlet of the condensed water pump (3) and the cold end inlet of the first low-pressure heater (5), and a second valve (8) is arranged between the outlet of the condensed water pump (3) and the cold end inlet of the heat exchanger (14).
3. The system for heating the condensed water of the main engine by using the waste heat of the steam condensed water supplied by the industrial heat supply system as claimed in claim 2, wherein a third valve (9), a fourth valve (10) and a fifth valve (11) are respectively arranged between the cold end outlet of the heat exchanger (14) and the cold end inlet of the first low pressure heater (5), the cold end inlet of the second low pressure heater (6) and the cold end inlet of the third low pressure heater (7), a sixth valve (13) is arranged between the hot end inlet of the heat exchanger (14) and the pipeline pump (12), and a seventh valve (15) is arranged between the hot end outlet of the heat exchanger (14) and the wastewater treatment system.
4. The working method of the system for heating the condensed water of the main machine by using the waste heat of the condensed water of the steam supplied from the outside of the industrial heating according to claim 3 is characterized by comprising the following steps:
opening a sixth valve (13) and a seventh valve (15), conveying the condensed water of the externally supplied steam to a heat exchanger (14) by a pipeline pump (12) to heat the condensed water of the main machine, and collecting the condensed water of the externally supplied steam after heat exchange into a wastewater treatment system for treatment;
the first valve (4) and the second valve (8) are opened, the condensate pump (3) respectively conveys the condensate of the main machine to the heat exchanger (14) and the first low-pressure heater (5) for heat exchange, and the condensate quantity entering the first low-pressure heater (5) and the heat exchanger (14) is adjusted by controlling the opening distribution of the first valve (4) and the second valve (8);
and the condensed water of the main machine heated by the heat exchanger (14) is respectively conveyed to the cold end inlet of the first low-pressure heater (5), the cold end inlet of the second low-pressure heater (6) and the cold end inlet of the third low-pressure heater (7) through pipelines.
5. The working method of the system for heating the condensed water of the main engine by using the waste heat of the steam condensed water supplied from the outside of the industrial heating is characterized in that if the temperature of the condensed water of the main engine after the heat exchange of the heat exchanger (14) is close to the temperature of the cold-end inlet of the first low-pressure heater (5), the third valve (9) is opened, the fourth valve (10) and the fifth valve (11) are closed, and the condensed water of the main engine is converged into the cold-end inlet of the first low-pressure heater (5); if the temperature of the condensed water of the main engine after heat exchange of the heat exchanger (14) is close to the temperature of the cold-end inlet of the second low-pressure heater (6), opening the fourth valve (10), closing the third valve (9) and the fifth valve (11), and enabling the condensed water of the main engine to converge into the cold-end inlet of the second low-pressure heater (6); and if the temperature of the condensed water of the main machine after heat exchange of the heat exchanger (14) is close to the temperature of the cold-end inlet of the third low-pressure heater (7), opening the fifth valve (11), and closing the third valve (9) and the fourth valve (10) to enable the condensed water of the main machine to be converged into the cold-end inlet of the third low-pressure heater (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111219231.8A CN114076303A (en) | 2021-10-20 | 2021-10-20 | System and method for heating condensed water of main engine by using waste heat of steam condensed water externally supplied by industrial heat supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111219231.8A CN114076303A (en) | 2021-10-20 | 2021-10-20 | System and method for heating condensed water of main engine by using waste heat of steam condensed water externally supplied by industrial heat supply |
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| CN114076303A true CN114076303A (en) | 2022-02-22 |
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| CN202111219231.8A Pending CN114076303A (en) | 2021-10-20 | 2021-10-20 | System and method for heating condensed water of main engine by using waste heat of steam condensed water externally supplied by industrial heat supply |
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