CN113623036A - System and method for raising steam pressure - Google Patents
System and method for raising steam pressure Download PDFInfo
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- CN113623036A CN113623036A CN202111072432.XA CN202111072432A CN113623036A CN 113623036 A CN113623036 A CN 113623036A CN 202111072432 A CN202111072432 A CN 202111072432A CN 113623036 A CN113623036 A CN 113623036A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007906 compression Methods 0.000 claims abstract description 159
- 230000006835 compression Effects 0.000 claims abstract description 154
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000005507 spraying Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 26
- 239000007921 spray Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/005—Using steam or condensate extracted or exhausted from steam engine plant by means of a heat pump
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Abstract
The invention discloses a system and a method for improving steam pressure, wherein the system consists of a pressure pump, a spraying device, a compression container, a water treatment device and a control valve; the invention utilizes the booster pump to drive the medium temperature water to compress the steam, utilizes the spraying device to control the temperature rise of the steam in the compression process, can obviously improve the external steam supply pressure range and the steam supply capacity of the power plant, can also effectively solve the problem that the existing steam compressor can not provide high-parameter steam, and has the advantages of wide adaptability and good economical efficiency.
Description
Technical Field
The invention belongs to the field of steam utilization, and particularly relates to a system and a method for improving steam pressure, which are suitable for industrial steam supply scenes, can generate steam with various parameters of medium pressure and high pressure by recycling low-pressure steam, and have good economical efficiency.
Background
The cogeneration technology can greatly improve the comprehensive utilization efficiency of primary energy, thereby reducing the consumption of the primary energy in the whole society and reducing the environmental pollution, so that a plurality of existing thermal power plants in China are provided with heating or industrial steam supply in a matching way, and the cogeneration degree is improved as much as possible. For a coal-fired power plant, a steam turbine plant can design a steam turbine unit structure and a steam extraction position according to industrial steam requirements provided by an owner in the initial construction stage, so that the steam extraction flow, the pressure and the unit safety are ensured, but with the rapid increase of the installed capacity of new energy, the conventional coal-fired units frequently operate in a low-load range, so that the steam supply flow and the pressure of some units in certain time periods cannot meet the industrial requirements, and the units must operate at high load for a long time in order to ensure the steam supply capacity, which is unfavorable for peak shaving of a power plant. In addition, for some coal-fired units with low industrial steam design flow or without industrial steam, with the development of the society, some industrial parks needing steam can appear around a power plant, but the problems of insufficient flow, insufficient pressure, influence on unit safety due to over-extraction and the like can appear at the existing steam extraction position of a steam turbine unit, the cost for modifying the steam turbine unit on a large scale is high, the time is long, and the problem of high-parameter industrial steam supply cannot be effectively solved. Through research, insufficient steam pressure is a common problem when a power plant supplies industrial steam to the outside, the pressure represents the grade of the steam, the higher the steam pressure is, the higher the temperature of a heat source which can be obtained by a user side is, and the power plant can actually provide a large amount of low-pressure steam.
Disclosure of Invention
In order to improve the capacity of supplying industrial steam to the outside of a coal-fired unit, the invention provides a system and a method for improving steam pressure.
In order to achieve the purpose, the invention adopts the following technical scheme.
A system for increasing steam pressure comprises a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a booster pump 5, a fifth valve 6, a sixth valve 7, a seventh valve 8, an eighth valve 9, a ninth valve 10, a tenth valve 11, a spraying device 12, an eleventh valve 13, a water treatment device 14, a first compression container 15 and a second compression container 16;
the low-pressure steam is divided into two paths, one path is connected with a low-pressure steam inlet of a first compression container 15 through the first valve 1, the other path is connected with a low-pressure steam inlet of a second compression container 16 through a third valve 3, the second valve 2 is connected with a high-pressure steam outlet of the first compression container 15, and the fourth valve 4 is connected with a high-pressure steam outlet of the second compression container 16; the lower water port of the first compression container 15 is connected with the eighth valve 9, the ninth valve 10 and the tenth valve 11, and the lower water port of the second compression container 16 is connected with the fifth valve 6, the sixth valve 7 and the seventh valve 8; the inlet of the booster pump 5 is connected with a ninth valve 10, an eleventh valve 13 and a seventh valve 8, and the outlet of the booster pump 5 is connected with a fifth valve 6 and an eighth valve 9; the upper parts of the first compression container 15 and the second compression container 16 are provided with a spraying device 12 respectively connected with a tenth valve 11 and a sixth valve 7; the water treatment device 14 is connected with the eleventh valve 13; the system utilizes the booster pump 5 to drive the medium-temperature water to compress low-pressure steam, the generated compression heat can be absorbed by water sprayed by the spraying device 12, the compression efficiency is improved, and the high-pressure steam pressure can be adjusted according to the requirements of users.
The first compression container 15 and the second compression container 16 alternately compress the vapor, and the vapor in one container is replenished into the other container when the vapor in the other container is compressed.
The first compression container 15 and the second compression container 16 are in a group, and when 2 or more groups of compression containers are configured, the system can realize continuous steam supply.
The spraying device 12 can spray water downwards in the process of compressing steam, control the temperature rise of the steam in the compression process and improve the compression efficiency.
The operation method of the system for increasing the steam pressure comprises two steps, specifically the following steps:
the method comprises the following steps: the upper part of the first compression container 15 is filled with steam, a small amount of medium temperature water is reserved at the lower part of the first compression container, a small amount of steam is reserved at the upper part of the second compression container 16, and a large amount of medium temperature water is reserved at the lower part of the second compression container; closing the first valve 1, the second valve 2, the fourth valve 4, the fifth valve 6, the sixth valve 7 and the ninth valve 10, opening the third valve 3, the seventh valve 8 and the eighth valve 9, adjusting the opening degree of the tenth valve 11 according to the superheat degree of steam in the first compression container 15, increasing the opening degree of the tenth valve 11 when the superheat degree of the steam in the first compression container 15 exceeds a limit value, determining whether the eleventh valve 13 is opened according to the liquid level in the second compression container 16, and opening the eleventh valve 13 when the liquid level in the second compression container 16 is too low to continuously convey the medium-temperature water to the first compression container 15; starting the pressure pump 5, pressurizing the medium-temperature water in the second compression container 16, sending the pressurized medium-temperature water into the first compression container 15 through the eighth valve 9, reducing the liquid level in the second compression container 16, increasing the liquid level in the first compression container 15, reducing the volume and increasing the pressure of the steam in the first compression container 15, and simultaneously enabling the low-pressure steam to enter the second compression container 16 through the third valve 3; the volume of the steam in the first compression container 15 is reduced, the temperature is increased, and the water quantity of the spraying device 12 is adjusted by controlling the opening degree of the tenth valve 11, so that the temperature of the steam is controlled; after the steam pressure in the first compression container 15 meets the requirement, the second valve 2 is opened to continuously discharge high-pressure steam, then the second valve 2, the third valve 3, the seventh valve 8, the eighth valve 9 and the tenth valve 11 are closed, the first valve 1, the fifth valve 6 and the ninth valve 10 are opened, the opening degree of the sixth valve 7 is adjusted according to the superheat degree of the steam in the second compression container 16, the opening degree of the sixth valve 7 is increased when the superheat degree of the steam in the second compression container 16 exceeds a limit value, whether the eleventh valve 13 is opened or not is determined according to the liquid level in the first compression container 15, and the eleventh valve 13 is opened when the liquid level in the first compression container 15 is too low to continuously deliver moderate-temperature water to the second compression container 16.
Step two: starting a pressure pump 5, pressurizing the medium-temperature water in the first compression container 15, sending the medium-temperature water into the second compression container 16 through a fifth valve 6, reducing the liquid level in the first compression container 15, increasing the liquid level in the second compression container 16, reducing the volume and increasing the pressure of steam in the second compression container 16, and simultaneously enabling low-pressure steam to enter the first compression container 15 through the first valve 1; the water quantity of the spraying device 12 is reasonably adjusted by controlling the opening degree of the sixth valve 7, so that the steam temperature is controlled; after the steam pressure in the second compression container 16 meets the requirement, opening the fourth valve 4 to continuously discharge high-pressure steam, then closing the first valve 1, the second valve 2, the fourth valve 4, the fifth valve 6, the sixth valve 7 and the ninth valve 10, opening the third valve 3, the seventh valve 8 and the eighth valve 9, adjusting the opening degree of the tenth valve 11 according to the superheat degree of the steam in the first compression container 15, increasing the opening degree of the tenth valve 11 when the superheat degree of the steam in the first compression container 15 exceeds a limit value, determining whether the eleventh valve 13 is opened according to the liquid level in the second compression container 16, and opening the eleventh valve 13 when the liquid level in the second compression container 16 is too low to continuously convey medium-temperature water to the first compression container 15; restarting the compression of the vapor in the first compression vessel 15; when the water amount in the first compression container 15 and the second compression container 16 is insufficient, the eleventh valve 13 is opened, and water which is treated by the water treatment device 14 and meets the water quality requirement is supplemented to the first compression container and the second compression container.
Compared with the prior art, the invention has the following advantages:
the system and the method for improving the steam pressure can obviously improve the external steam supply pressure range and the steam supply capacity of a power plant, can effectively solve the problem that the conventional steam compressor cannot provide high-parameter steam, avoids the problem that a rotary compression part is easy to overheat, can provide steam with various parameters of medium and high pressure, and has wide adaptability and good economical efficiency.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure:
1-first valve 2-second valve 3-third valve 4-fourth valve 5-booster pump 6-fifth valve 7-sixth valve 8-seventh valve 9-eighth valve 10-ninth valve 11-tenth valve 12-spray device 13-eleventh valve 14-water treatment device
15-compression container one 16-compression container two.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific embodiments, which are described herein for purposes of illustration only and are not intended to be limiting.
As shown in figure 1, the system for raising steam pressure of the invention comprises a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a booster pump 5, a fifth valve 6, a sixth valve 7, a seventh valve 8, an eighth valve 9, a ninth valve 10, a tenth valve 11, a spraying device 12, an eleventh valve 13, a water treatment device 14, a first compression container 15 and a second compression container 16.
The low-pressure steam is divided into two paths, one path is connected with a low-pressure steam inlet of a first compression container 15 through a first valve 1, the other path is connected with a low-pressure steam inlet of a second compression container 16 through a third valve 3, a second valve 2 is connected with a high-pressure steam outlet of the first compression container 15, and a fourth valve 4 is connected with a high-pressure steam outlet of the second compression container 16; the lower water port of the first compression container 15 is connected with the eighth valve 9, the ninth valve 10 and the tenth valve 11, and the lower water port of the second compression container 16 is connected with the fifth valve 6, the sixth valve 7 and the seventh valve 8; the inlet of the booster pump 5 is connected with a ninth valve 10, an eleventh valve 13 and a seventh valve 8, and the outlet of the booster pump 5 is connected with a fifth valve 6 and an eighth valve 9; spraying devices 12 are arranged in the first compression container 15 and the second compression container 16 and are respectively connected with the tenth valve 11 and the sixth valve 7; the water treatment device 14 is connected to the eleventh valve 13.
The first compression container 15 and the second compression container 16 are combined into a group, when the system is started, the upper part of one container is stored with a small amount of steam, the lower part of the other container is stored with a large amount of medium-temperature water, the upper part of the other container is stored with a large amount of steam, and the lower part of the other container is stored with a small amount of medium-temperature water, and the details are described by taking an example that the first compression container 15 is stored with a large amount of low-pressure steam when the system is started as an example. Closing the first valve 1, the second valve 2, the fifth valve 6 and the ninth valve 10, allowing medium-temperature water in the second compression container 16 to enter the pressure pump 5 through the seventh valve 8, allowing the water pressure to rise and then enter the first compression container 15 through the eighth valve 9, allowing the volume of steam in the first compression container 15 to be reduced, the pressure to rise and the temperature to rise, controlling the opening degree of the tenth valve 11, spraying a proper amount of medium-temperature water into the first compression container 15 through the spraying device 12, reasonably controlling the temperature of the steam, preventing the temperature of the steam from being too high or too low, and ensuring the compression efficiency; in the process, the liquid level in the second compression container 16 is gradually reduced, and the third valve 3 is opened to send low-pressure steam into the second compression container 16 so as to reduce the power consumption of the booster pump 5 and prepare for the compression of the steam in the second compression container 16; after the steam pressure in the first compression container 15 meets the requirement, the second valve 2 is opened to discharge high-pressure steam, at the moment, the booster pump 5 continues to deliver medium-temperature water into the first compression container 15 to ensure the stability of the high-pressure steam pressure, when the liquid level in the second compression container 16 reaches the lowest liquid level, the second valve 2, the third valve 3, the seventh valve 8 and the eighth valve 9 are closed, and the first valve 1, the fifth valve 6 and the ninth valve 10 are opened; the medium-temperature water in the first compression container 15 is subjected to pressure increase by the booster pump 5 and then enters the second compression container 16, the liquid level in the first compression container 15 is gradually reduced in the process, the first valve 1 is opened to send low-pressure steam into the first compression container 15, so that the power consumption of the booster pump 5 is reduced, and preparation is made for steam compression in the first compression container 15; after the steam pressure in the second compression container 16 meets the requirement, the fourth valve 4 is opened to discharge high-pressure steam, at the moment, the booster pump 5 continues to convey medium-temperature water into the second compression container 16 to ensure the stability of the high-pressure steam pressure, when the liquid level in the first compression container 15 reaches the lowest liquid level, the fourth valve 4, the first valve 1, the fifth valve 6 and the ninth valve 10 are closed, the third valve 3, the seventh valve 8 and the eighth valve 9 are opened, and the compression of the steam in the first compression container 15 is restarted; in the process of compressing the steam, a large amount of compression heat is generated, part of the medium-temperature water is evaporated, and the eleventh valve 13 is periodically opened to supplement water which is treated by the water treatment device 14 and meets the water quality requirement.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the invention may be made by those skilled in the art within the spirit and scope of the invention. Any insubstantial modification of the invention using this concept is intended to be covered by the act of infringing the scope of the invention.
Claims (5)
1. A system for lifting steam pressure, comprising: the device is characterized by comprising a first valve (1), a second valve (2), a third valve (3), a fourth valve (4), a booster pump (5), a fifth valve (6), a sixth valve (7), a seventh valve (8), an eighth valve (9), a ninth valve (10), a tenth valve (11), a spraying device (12), an eleventh valve (13), a water treatment device (14), a first compression container (15) and a second compression container (16);
the low-pressure steam is divided into two paths, one path is connected with a low-pressure steam inlet of a first compression container (15) through the first valve (1), the other path is connected with a low-pressure steam inlet of a second compression container (16) through a third valve (3), the second valve (2) is connected with a high-pressure steam outlet of the first compression container (15), and the fourth valve (4) is connected with a high-pressure steam outlet of the second compression container (16); the lower water port of the first compression container (15) is connected with the eighth valve (9), the ninth valve (10) and the tenth valve (11), and the lower water port of the second compression container (16) is connected with the fifth valve (6), the sixth valve (7) and the seventh valve (8); the inlet of the booster pump (5) is connected with the ninth valve (10), the eleventh valve (13) and the seventh valve (8), and the outlet of the booster pump (5) is connected with the fifth valve (6) and the eighth valve (9); the upper parts in the first compression container (15) and the second compression container (16) are provided with a spraying device (12) which is respectively connected with the tenth valve (11) and the sixth valve (7); the water treatment device (14) is connected with the eleventh valve (13); the system utilizes the pressurizing pump (5) to drive the medium-temperature water to compress low-pressure steam, the generated compression heat is absorbed by water sprayed out of the spraying device (12), the compression efficiency is improved, and the high-pressure steam pressure can be adjusted according to the user requirements.
2. A system for lifting steam pressure as defined in claim 1 wherein: the first compression container (15) and the second compression container (16) alternately compress the steam, and when the steam in one container is compressed, the steam in the other container is supplemented.
3. A system for lifting steam pressure as defined in claim 1 wherein: the first compression container (15) and the second compression container (16) form a group, and when two or more groups of compression containers are configured, the system can realize continuous steam supply.
4. A system for lifting steam pressure as defined in claim 1 wherein: the spraying device (12) can spray water downwards in the process of compressing steam, control the temperature rise of the steam in the compression process and improve the compression efficiency.
5. A method of operating a steam pressure raising system as claimed in any one of claims 1 to 4, wherein: the method comprises the following two steps:
the method comprises the following steps: the upper part of the first compression container (15) is filled with steam, a small amount of medium-temperature water is reserved at the bottom, a small amount of steam is reserved at the upper part of the second compression container (16), and a large amount of medium-temperature water is reserved at the lower part of the second compression container; closing the first valve (1), the second valve (2), the fourth valve (4), the fifth valve (6), the sixth valve (7) and the ninth valve (10), opening the third valve (3), the seventh valve (8) and the eighth valve (9), adjusting the opening degree of the tenth valve (11) according to the superheat degree of steam in the first compression container (15), increasing the opening degree of the tenth valve (11) when the superheat degree of the steam in the first compression container (15) exceeds a limit value, determining whether the eleventh valve (13) is opened according to the liquid level in the second compression container (16), and opening the eleventh valve (13) when the liquid level in the second compression container (16) is too low to continuously convey medium-temperature water to the first compression container (15); starting a pressure pump (5), pressurizing the medium-temperature water in a second compression container (16), sending the medium-temperature water into the first compression container (15) through an eighth valve (9), reducing the liquid level in the second compression container (16), increasing the liquid level in the first compression container (15), reducing the volume and increasing the pressure of steam in the first compression container (15), and simultaneously introducing low-pressure steam into the second compression container (16) through a third valve (3); the volume of the steam in the first compression container (15) is reduced, the temperature is increased, and the water quantity of the spraying device (12) is adjusted by controlling the opening degree of the tenth valve (11), so that the temperature of the steam is controlled; after the steam pressure in the first compression container (15) meets the requirement, opening a second valve (2) to continuously discharge high-pressure steam, then closing the second valve (2), a third valve (3), a seventh valve (8), an eighth valve (9) and a tenth valve (11), opening a first valve (1), a fifth valve (6) and a ninth valve (10), adjusting the opening degree of a sixth valve (7) according to the superheat degree of the steam in the second compression container (16), increasing the opening degree of the sixth valve (7) when the superheat degree of the steam in the second compression container (16) exceeds a limit value, determining whether an eleventh valve (13) is opened according to the liquid level in the first compression container (15), and opening the eleventh valve (13) when the liquid level in the first compression container (15) is too low to continuously convey medium-temperature water to the second compression container (16);
step two: starting a pressure pump (5), pressurizing the medium-temperature water in the first compression container (15), and then sending the medium-temperature water into the second compression container (16) through a fifth valve (6), wherein the liquid level in the first compression container (15) is reduced, the liquid level in the second compression container (16) is increased, the volume of steam in the second compression container (16) is reduced, the pressure is increased, and meanwhile, low-pressure steam enters the first compression container (15) through the first valve (1); the water quantity of the spraying device (12) is adjusted by controlling the opening degree of the sixth valve (7), so that the steam temperature is controlled; after the steam pressure in the second compression container (16) meets the requirement, the fourth valve (4) is opened to continuously discharge high-pressure steam, then the first valve (1), the second valve (2), the fourth valve (4), the fifth valve (6), the sixth valve (7) and the ninth valve (10) are closed, the third valve (3), the seventh valve (8) and the eighth valve (9) are opened, the opening degree of the tenth valve (11) is adjusted according to the superheat degree of the steam in the first compression container (15), the opening degree of the tenth valve (11) is increased when the superheat degree of the steam in the first compression container (15) exceeds a limit value, whether the eleventh valve (13) is opened or not is determined according to the liquid level in the second compression container (16), and the eleventh valve (13) is opened when the liquid level in the second compression container (16) is too low to continuously convey warm water to the first compression container (15), restarting compression of the vapour in the compression vessel one (15); when the water in the first compression container (15) and the second compression container (16) is insufficient, the eleventh valve (13) is opened, and water which is treated by the water treatment device (14) and meets the water quality requirement is supplemented to the first compression container and the second compression container.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111072432.XA CN113623036A (en) | 2021-09-14 | 2021-09-14 | System and method for raising steam pressure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111072432.XA CN113623036A (en) | 2021-09-14 | 2021-09-14 | System and method for raising steam pressure |
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| CN113623036A true CN113623036A (en) | 2021-11-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024148696A1 (en) * | 2023-01-10 | 2024-07-18 | 西安热工研究院有限公司 | Phase-change vapor compression heat pump and operating method therefor |
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Application publication date: 20211109 |