CN110925039A - Energy-saving water spray temperature reduction steam heating system - Google Patents
Energy-saving water spray temperature reduction steam heating system Download PDFInfo
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- CN110925039A CN110925039A CN201911021172.6A CN201911021172A CN110925039A CN 110925039 A CN110925039 A CN 110925039A CN 201911021172 A CN201911021172 A CN 201911021172A CN 110925039 A CN110925039 A CN 110925039A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides an energy-saving water spraying temperature-reducing steam heating system, and belongs to the technical field of energy. The system comprises a boiler, a steam turbine, a generator, a water spraying desuperheater, a surface type desuperheating water heater, a heating steam extraction pipe, a desuperheating water inlet pipe, a desuperheating water outlet pipe, a heat supply steam extraction pipe, an external heat supply pipe and a steam return pipe. A water spraying preheating system is added on the basis of steam extraction and heat supply of a conventional thermal generator set; the added surface type desuperheating water heater heats desuperheating water by utilizing steam extraction of a machine set, and the heated desuperheating water is heated by utilizing a water spraying desuperheater to adjust the temperature of heat supply steam extraction and supply heat to the outside. The temperature-reducing steam heating system has the advantages of reasonable structure, reliable system, high comprehensive operation efficiency of the boiler, flexible adjustment, more reasonable utilization of energy level gradient and obvious energy-saving effect.
Description
Technical Field
The invention relates to an energy-saving water spraying temperature-reducing steam heating system, and belongs to the technical field of energy.
Background
The purpose of improving the economy of the generator set and achieving energy conservation and emission reduction is achieved. Most of domestic generator sets are improved by energy-saving technology. The boiler, the steam turbine and the generator are three main machines of a conventional thermal generator set. In order to improve the economy of a conventional thermal power generating set and achieve the purposes of energy conservation and emission reduction, the domestic thermal power generating set is technically improved and externally provides steam extraction and heat supply. However, for steam extraction and heat supply transformation of a thermal power generating unit, steam extraction parameters usually cannot completely meet the requirements of users due to the difference of system positions. At present, the conventional steam extraction utilizes a water spraying mixing mode for temperature reduction, a heating system for directly reducing temperature and pressure by steam extraction is adopted, and the energy consumption of a unit is high. Therefore, a steam extraction and heat supply system with reliable system operation and lower unit energy consumption is needed in the technical field.
Disclosure of Invention
The invention aims to solve the technical problems that the existing steam extraction and heat supply system of the thermal power generating unit has high unit energy consumption and steam extraction parameters can not completely meet the requirements of users.
In order to solve the above problems, the technical scheme adopted by the invention is to provide an energy-saving water-spraying temperature-reducing steam heating system, which comprises a boiler, a steam turbine, a generator, a water-spraying temperature reducer, a surface-type temperature-reducing water heater, a heating steam extraction pipe, a temperature-reducing water inlet pipe, a temperature-reducing water outlet pipe, a heating steam extraction pipe, an external heating pipe and a steam return pipe; the boiler generates steam to drive a steam turbine to drive a generator to generate electricity; the steam turbine is connected with a surface type desuperheating water heater through a heating steam extraction pipe, and the surface type desuperheating water heater is provided with a steam return pipe; the surface type desuperheating water heater is also provided with a desuperheating water inlet pipe; the surface type desuperheater heater is connected with the water spray desuperheater through a desuperheater water outlet pipe; the steam turbine is connected with the water spray desuperheater through a heat supply steam extraction pipe; the water spraying desuperheater is provided with an external heat supply pipe.
Preferably, the heating steam extraction pipe is communicated with the steam return pipe through a surface type temperature-reducing water heater.
Preferably, the temperature-reducing water inlet pipe is communicated with the temperature-reducing water outlet pipe through a surface type temperature-reducing water heater.
Preferably, the heat supply steam extraction pipe is communicated with an external heat supply pipe through a water spray desuperheater.
Preferably, the steam return pipe is connected with a steam turbine.
The energy-saving water-spraying temperature-reducing steam heating system is additionally provided with a water-spraying preheating system on the basis of steam extraction and heat supply of a conventional thermal generator set; the added surface type desuperheating water heater heats desuperheating water by utilizing steam extraction of a machine set, and the heated desuperheating water is heated by utilizing a water spraying desuperheater to adjust the temperature of heat supply steam extraction and supply heat to the outside.
Compared with the prior art, the invention has the following beneficial effects: compared with a direct steam extraction temperature-reducing heating system, the temperature-reducing steam heating system firstly heats the temperature-reducing water by utilizing the superheat degree of regenerative steam extraction of the unit, and the unit has smaller heat supply steam extraction amount, higher unit efficiency and more reasonable energy level gradient utilization by utilizing the superheat degree of steam extraction for heating the temperature-reducing water; the invention has reasonable structure and reliable system, and is a steam extraction and heat supply system with lower unit energy consumption.
Drawings
FIG. 1 is a schematic diagram of the composition and operation principle of an energy-saving water-spraying temperature-reducing steam heating system provided by the invention.
Reference numerals: 1. boiler 2, turbine 3, generator 4, water spray desuperheater 5, surface desuperheating water heater 6, heating steam extraction pipe 7, desuperheating water inlet pipe 8, desuperheating water outlet pipe 9, heat supply steam extraction pipe 10, external heat supply pipe 11, steam return pipe
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings;
as shown in fig. 1, the energy-saving water-spraying temperature-reducing steam heating system provided by the invention comprises a boiler 1, a steam turbine 2, a generator 3, a water-spraying temperature reducer 4, a surface-type temperature-reducing water heater 5, a heating steam extraction pipe 6, a temperature-reducing water inlet pipe 7, a temperature-reducing water outlet pipe 8, a heating steam extraction pipe 9, an external heating pipe 10 and a steam return pipe 11; the boiler 1 is connected with a generator 3 through a steam turbine 2; the surface type desuperheating water heater 5 is provided with a heating steam extraction pipe 6 and a steam return pipe 11, and the heating steam extraction pipe 6 is communicated with the steam return pipe 11 through the surface type desuperheating water heater 5. The surface type desuperheating water heater 5 is also connected with a desuperheating water inlet pipe 7, the desuperheating water inlet pipe 7 is communicated with a desuperheating water outlet pipe 8 through the surface type desuperheating water heater 5, and the surface type desuperheating water heater 5 is connected with the water spraying desuperheater 4 through the desuperheating water outlet pipe 8; the water spray desuperheater 4 is provided with a heat supply steam extraction pipe 9 and an external heat supply pipe 10, and the heat supply steam extraction pipe 9 is communicated with the external heat supply pipe 10 through the water spray desuperheater 4; the heating steam extraction pipe 6 and the heat supply steam extraction pipe 9 are connected with the steam turbine 2 system, and the steam return pipe 11 is connected with the steam turbine 2 system.
The conventional thermal power generating unit comprises three main machines, namely a boiler 1, a steam turbine 2 and a generator 3. The surface type desuperheating water heater 5 heats the system unsaturated water taken from the thermal power generating set by using the set extraction steam of the steam turbine 2. After the steam extraction heat exchange and temperature reduction, the water is led back to the system and is led to the water spray desuperheater 4 as desuperheater water after being heated. The water spray desuperheater 4 adjusts the heating steam to required parameters by using desuperheating water in a spraying mode to supply heat to the outside, the heating steam is extracted from a system of a thermal power generating set, and the desuperheating water is unsaturated water at an outlet of the surface type desuperheating water heater 5.
The working process of the invention is as follows: the heating steam in the working process comes from the extraction steam of the thermal power generating set system, the temperature-reducing water comes from unsaturated water of the thermal power generating set system, and the heating steam of the temperature-reducing water also comes from the extraction steam of the thermal power generating set system. The working process is mainly divided into two flows. In the first process, unit extraction steam of the steam turbine 2 enters the surface type temperature-reducing water heater 5 through the heating extraction pipe 6, system unsaturated water from the thermal power generating unit enters the surface type temperature-reducing water heater 5 through the temperature-reducing water inlet pipe 7, and the system unsaturated water from the thermal power generating unit is heated in the surface type temperature-reducing water heater 5 by utilizing the unit extraction steam of the steam turbine 2. After the steam extraction heat exchange and temperature reduction, the steam is led back to the system through a steam return pipe 11, and the unsaturated water is heated and then led to the water spray desuperheater 4 through a desuperheating water outlet pipe 8 as desuperheating water. In the second process, the heating steam from the system of the thermal generator set enters the water spray desuperheater 4 through the heating steam extraction pipe 9, the heating steam is adjusted to the parameters required by the user in the water spray desuperheater 4 by using the desuperheating water from the desuperheating water outlet pipe 8 in a spraying mode, and then the heat is supplied to the outside through the external heating pipe 10. The heat supply steam is extracted from a system of a thermal generator set, and the desuperheating water is unsaturated water at an outlet of the surface desuperheating water heater.
Compared with the traditional direct heat supply and temperature reduction system for heat supply and steam extraction, the system provided by the invention utilizes the superheat degree of extracted steam for heating temperature reduction water, so that the heat supply and steam extraction amount of the unit is smaller, the unit efficiency is higher, and the energy level gradient is more reasonably utilized. Compared with a direct steam extraction temperature-reducing and pressure-reducing heat supply system, a 600MW steam turbine generator unit supplies heat for 300 tons/h (the steam extraction temperature of the unit is 538 ℃ and the heat supply temperature is 350 ℃), and after the system is applied, if the temperature of the temperature-reducing water is increased from 180 ℃ to 250 ℃, the steam extraction flow of the unit is reduced from 252.93 tons/h to 246.81 tons/h. The main steam flow of the unit is reduced by 4.092 tons/h, the reheat steam flow is reduced by 3.345 tons/h, the coal consumption of the unit for power generation is reduced by 0.66g/kwh, the annual power generation amount is 330000 thousands kwh, and the annual coal saving amount is 2178 tons. If the steam extraction amount is increased, the income is larger, and the energy-saving effect is obvious.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the 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 (5)
1. An energy-saving water-spraying temperature-reducing steam heating system comprises a boiler (1), a steam turbine (2), a generator (3), a water-spraying temperature-reducing device (4), a surface type temperature-reducing water heater (5), a heating steam extraction pipe (6), a temperature-reducing water inlet pipe (7), a temperature-reducing water outlet pipe (8), a heat supply steam extraction pipe (9), an external heat supply pipe (10) and a steam return pipe (11); the boiler (1) is connected with a generator (3) through a steam turbine (2); the steam turbine (2) is connected with a surface type desuperheating water heater (5) through a heating steam extraction pipe (6), and the surface type desuperheating water heater (5) is provided with a steam return pipe (11); the surface type desuperheating water heater (5) is also provided with a desuperheating water inlet pipe (7); the surface type desuperheater heater (5) is connected with the water spray desuperheater (4) through a desuperheater water outlet pipe (8); the steam turbine (2) is connected with the water spray desuperheater (4) through a heat supply steam extraction pipe (9); the water spray desuperheater (4) is provided with an external heat supply pipe (10).
2. An energy-saving water spray temperature-reducing steam heating system as claimed in claim 1, wherein: the heating steam extraction pipe (6) is communicated with the steam return pipe (11) through a surface type desuperheating water heater (5).
3. An energy-saving water spray temperature-reducing steam heating system as claimed in claim 1, wherein: the desuperheating water inlet pipe (7) is communicated with the desuperheating water outlet pipe (8) through a surface desuperheating water heater (5).
4. An energy-saving water spray temperature-reducing steam heating system as claimed in claim 1, wherein: the heat supply steam extraction pipe (9) is communicated with an external heat supply pipe (10) through the water spray desuperheater (4).
5. An energy-saving water spray temperature-reducing steam heating system as claimed in claim 1, wherein: the steam return pipe (11) is connected with the steam turbine (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911021172.6A CN110925039A (en) | 2019-10-25 | 2019-10-25 | Energy-saving water spray temperature reduction steam heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911021172.6A CN110925039A (en) | 2019-10-25 | 2019-10-25 | Energy-saving water spray temperature reduction steam heating system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061027A (en) * | 2014-07-11 | 2014-09-24 | 中国电力工程顾问集团华东电力设计院 | High-temperature extracted steam cooling system of double-reheat turbine thermodynamic system |
| CN108301884A (en) * | 2017-12-27 | 2018-07-20 | 东南大学 | A kind of pumping that adding steam jet ejector coagulates heating system and its adjusting method |
| CN109736907A (en) * | 2018-12-28 | 2019-05-10 | 陕西渭河发电有限公司 | A kind of steam turbine high back pressure heating system and its auxiliary system |
| CN208870644U (en) * | 2018-08-16 | 2019-05-17 | 华电电力科学研究院有限公司 | A kind of adjustable steam extraction formula steam turbine gland seal device |
-
2019
- 2019-10-25 CN CN201911021172.6A patent/CN110925039A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061027A (en) * | 2014-07-11 | 2014-09-24 | 中国电力工程顾问集团华东电力设计院 | High-temperature extracted steam cooling system of double-reheat turbine thermodynamic system |
| CN108301884A (en) * | 2017-12-27 | 2018-07-20 | 东南大学 | A kind of pumping that adding steam jet ejector coagulates heating system and its adjusting method |
| CN208870644U (en) * | 2018-08-16 | 2019-05-17 | 华电电力科学研究院有限公司 | A kind of adjustable steam extraction formula steam turbine gland seal device |
| CN109736907A (en) * | 2018-12-28 | 2019-05-10 | 陕西渭河发电有限公司 | A kind of steam turbine high back pressure heating system and its auxiliary system |
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