CN111911909B - Pressure-reducing heat-preserving system for high-parameter superheated steam and control method thereof - Google Patents
Pressure-reducing heat-preserving system for high-parameter superheated steam and control method thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
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- F22G5/126—Water injection apparatus in combination with steam-pressure reducing valves
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Abstract
The invention belongs to the field of thermoelectric decoupling of thermal power plants, and particularly relates to a high-parameter superheated steam pressure-reducing heat-preserving system. The temperature and pressure reduction device comprises a first shutoff valve, a first four-way joint, a second shutoff valve, a first pressure reduction pore plate, a second four-way joint, a first temperature and pressure reduction device, a third shutoff valve, a second pressure reduction pore plate and a second temperature and pressure reduction device. The system can realize long-term, continuous and safe temperature and pressure reduction of the superheated steam with the pressure range of 2.0-17.5 MPa to the parameters of the heat supply steam, ensures that the heat supply capacity is basically lossless, and has wide application prospect in the field of thermoelectric decoupling of thermal power plants.
Description
Technical Field
The invention belongs to the field of thermoelectric decoupling of thermal power plants, and particularly relates to a high-parameter superheated steam pressure-reducing heat-preserving system and a control method thereof.
Background
The urban heating mainly comprises two modes of a heat supply type steam turbine generator unit and an industrial heating boiler of a thermal power plant. The current environmental protection requirement is increasingly strict, and industrial boilers are gradually banned. With the acceleration of the urbanization process, the heat supply load expands rapidly, but the electric load faces the dilemma of long-term fatigue; in addition, impact caused by new energy power generation causes the heat supply type steam turbine generator unit to face more and more serious thermal coupling problems. Therefore, how to satisfy the actual requirements of low electric load and high heat load simultaneously through technical transformation under the restriction of the original design condition of the heat supply type steam turbine generator unit is an important problem faced by the heat supply type steam turbine generator unit.
The common heat supply capacity expansion measures of the heat supply type steam turbine generator unit include high back pressure operation (or two sets of rotors, an optical axis and the like) of a steam turbine, flexibility cutting off operation of a low pressure cylinder, zero output operation of the low pressure cylinder and the like. However, these operation methods still cannot meet the peak heating load requirement of the city, and cannot fundamentally solve the problem of the mismatch of the thermoelectric load. Therefore, the heat supply type steam turbine generator unit can only adopt a higher-grade heat supply mode, such as: (1) directly cooling and depressurizing main steam of a boiler part to heat supply steam parameters; (2) and reducing the temperature and pressure of the main steam to proper parameters, introducing the parameters into a reheater, and reducing the temperature and pressure of the reheated steam to heat supply steam parameters again. This requires high-parameter superheated steam to ensure safety and reliability during the temperature and pressure reduction process. However, the temperature and pressure reducers commonly used in thermal power plants are all used in accidents or machine set start and stop, and the conventional temperature and pressure reducers cannot meet the requirement of long-term and safe operation in a heat supply period due to the strong impact force and destructive force of high-parameter superheated steam. Moreover, the series connection of multiple stages of temperature and pressure reducers causes high cost and is difficult to bear by a thermal power plant. Therefore, it is necessary to develop a heat-preserving and pressure-reducing system of high-parameter superheated steam capable of long-term safe continuous operation and a control method thereof.
Disclosure of Invention
The invention aims to provide a pressure reduction and heat preservation system for high-parameter superheated steam and a control method thereof.
The invention adopts the following technical scheme: a pressure reduction and heat preservation system for high-parameter superheated steam comprises a first shutoff valve, a first four-way joint, a second shutoff valve, a first pressure reduction pore plate, a second four-way joint, a first temperature and pressure reducer, a third shutoff valve, a second pressure reduction pore plate and a second temperature and pressure reducer; the first interface of the first four-way joint is connected with the high-parameter superheated steam inlet, the second interface of the first four-way joint is connected with the inlet of the first shutoff valve, the third interface of the first four-way joint is connected with the inlet of the second shutoff valve, and the fourth interface of the first four-way joint is connected with the inlet of the third shutoff valve; the outlet of the first shutoff valve is connected with the first interface of the second four-way joint; the outlet of the second shutoff valve is connected with the inlet of the first pressure reducing orifice plate, and the outlet of the first pressure reducing orifice plate is connected with the second interface of the second four-way joint; an outlet of the third shutoff valve is connected with an inlet of the second pressure reducing pore plate, an outlet of the second pressure reducing pore plate is connected with a first inlet of the second temperature and pressure reducer, a second inlet of the second temperature and pressure reducer is connected with a second temperature reducing water inlet, and an outlet of the second temperature and pressure reducer is connected with a third interface of the second four-way joint; the fourth interface of second four-way connection links to each other with first inlet of first temperature and pressure reducer, and the second inlet of first temperature and pressure reducer is first temperature and pressure reducing water entry, and the export and the heat supply steam exit linkage of first temperature and pressure reducer.
A control method of a pressure-reducing heat-preserving system for high-parameter superheated steam comprises the following specific steps.
S100, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is larger than 0.7, opening a first shutoff valve and a first temperature and pressure reducing device, closing a second shutoff valve, a third shutoff valve and a second temperature and pressure reducing device, and introducing first temperature reducing water.
S200, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is 0.2-0.7, closing the first shut-off valve, the third shut-off valve and the second temperature and pressure reducing device, opening the second shut-off valve and the first temperature and pressure reducing device, and introducing first temperature reducing water.
S300, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is 0.05-0.2, closing the first shut-off valve and the second shut-off valve, opening the third shut-off valve, the first temperature and pressure reducer and the second temperature and pressure reducer, and introducing first temperature reduction water and second temperature reduction water.
S400, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is less than 0.05, the pressure reduction and heat preservation system of the high-parameter superheated steam stops running.
Furthermore, the high-parameter steam refers to superheated steam with the pressure of 2.0-13.0 MPa, and the heat supply steam refers to superheated steam with the pressure of 0.2-0.7 MPa.
Furthermore, the first pressure reduction orifice plate and the second pressure reduction orifice plate are provided with large and small orifices with variable quantities, and the number, the size and the positions of the large and small orifices are determined according to the actual cooling and pressure reduction requirements.
Compared with the prior art, the invention greatly improves the heat supply capacity of the heat supply type steam turbine generator unit, basically realizes the separation of heat and electric loads and solves the problem of thermal coupling; the steam temperature and pressure reducing system can run safely for a long time and is not limited to be temporarily used in an accident or start-stop stage; the working pressure and temperature of a single temperature and pressure reducer are greatly reduced, the number of the temperature and pressure reducers required to be connected in series is reduced, and the cost of the whole steam temperature and pressure reducing system is reduced.
Drawings
FIG. 1 is a schematic diagram of a high parameter superheated steam pressure reduction and heat retention system;
FIG. 2 is a cross-sectional view of a first and second pressure reducing orifice plate;
FIG. 3 is a front view of a first and second depressurization orifice plate;
in the figure: 1. a first shut-off valve; 2. a first four-way joint; 3. a second shutoff valve; 4. a first pressure reducing orifice plate; 5. A second four-way joint; 6. A first temperature and pressure reducer; 7. a third shutoff valve; 8. a second pressure reducing orifice plate; 9. a second temperature and pressure reducer; 10. a pressure reducing orifice plate body; 11. a small orifice; 12. a large orifice. N1, high parameter superheated steam; n2, first desuperheating water; n3, second desuperheating water; n4, low parameter superheated steam.
Detailed Description
Referring to fig. 1, the pressure-reducing and heat-preserving system for high-parameter superheated steam comprises a first shutoff valve 1, a first four-way joint 2, a second shutoff valve 3, a first pressure-reducing orifice plate 4, a second four-way joint 5, a first temperature-reducing pressure reducer 6, a third shutoff valve 7, a second pressure-reducing orifice plate 8 and a second temperature-reducing pressure reducer 9; a first interface of the first four-way joint 2 is connected with a high-parameter superheated steam inlet N1, a second interface of the first four-way joint 2 is connected with an inlet of the first shutoff valve 1, a third interface of the first four-way joint 2 is connected with an inlet of the second shutoff valve 3, and a fourth interface of the first four-way joint 2 is connected with an inlet of the third shutoff valve 7; the outlet of the first shutoff valve 1 is connected with the first interface of the second four-way joint 5; the outlet of the second shutoff valve 3 is connected with the inlet of the first pressure reducing orifice plate 4, and the outlet of the first pressure reducing orifice plate 4 is connected with the second interface of the second four-way joint 5; an outlet of the third shut-off valve 7 is connected with an inlet of the second pressure reducing pore plate 8, an outlet of the second pressure reducing pore plate 8 is connected with a first inlet of the second temperature and pressure reducer 9, a second inlet of the second temperature and pressure reducer 9 is connected with a second temperature reducing water inlet N3, and an outlet of the second temperature and pressure reducer 9 is connected with a third interface of the second four-way joint 5; the fourth interface of second four-way connection 5 links to each other with the first entry of first temperature and pressure reducer 6, and the second entry of first temperature and pressure reducer 6 is first temperature and pressure reducer water inlet N2, and the export of first temperature and pressure reducer 6 is connected with heat supply steam outlet N4.
A control method of a pressure-reducing heat-preserving system for high-parameter superheated steam is specifically as follows.
S100, when the pressure ratio of the heating steam to the high-parameter superheated steam is larger than 0.7, opening the first shutoff valve 1 and the first temperature and pressure reducing device 6, closing the second shutoff valve 3, the third shutoff valve 7 and the second temperature and pressure reducing device 9, and introducing first temperature reducing water.
S200, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is 0.2-0.7, closing the first shut-off valve 1, the third shut-off valve 7 and the second temperature and pressure reducer 9, opening the second shut-off valve 3 and the first temperature and pressure reducer 6, and introducing first temperature reduction water.
S300, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is 0.05-0.2, closing the first shut-off valve 1 and the second shut-off valve 3, opening the third shut-off valve 7, the first temperature and pressure reducer 6 and the second temperature and pressure reducer 9, and introducing first temperature reduction water and second temperature reduction water.
S400, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is less than 0.05, the pressure reduction and heat preservation system of the high-parameter superheated steam stops running.
Referring to fig. 1, the high-parameter steam refers to superheated steam with the pressure of 2.0-13.0 MPa, and the heating steam refers to superheated steam with the pressure of 0.2-0.7 MPa.
Referring to fig. 2 and 3, the first pressure reducing orifice plate 4 and the second pressure reducing orifice plate 8 are provided with a variable number of large orifices 12 and small orifices 11, and the number, size and position of the large and small orifices are determined according to the actual cooling and pressure reducing requirements.
Claims (3)
1. A pressure reduction and heat preservation system of high-parameter superheated steam and a control method thereof are characterized in that: the system comprises a first shutoff valve (1), a first four-way joint (2), a second shutoff valve (3), a first pressure reducing pore plate (4), a second four-way joint (5), a first temperature and pressure reducer (6), a third shutoff valve (7), a second pressure reducing pore plate (8) and a second temperature and pressure reducer (9); a first interface of the first four-way joint (2) is connected with a high-parameter superheated steam inlet (N1), a second interface of the first four-way joint (2) is connected with an inlet of the first shutoff valve (1), a third interface of the first four-way joint (2) is connected with an inlet of the second shutoff valve (3), and a fourth interface of the first four-way joint (2) is connected with an inlet of the third shutoff valve (7); the outlet of the first shutoff valve (1) is connected with the first interface of the second four-way joint (5); the outlet of the second shutoff valve (3) is connected with the inlet of the first pressure reducing pore plate (4), and the outlet of the first pressure reducing pore plate (4) is connected with the second interface of the second four-way joint (5); an outlet of the third shut-off valve (7) is connected with an inlet of a second pressure reducing pore plate (8), an outlet of the second pressure reducing pore plate (8) is connected with a first inlet of a second temperature and pressure reducer (9), a second inlet of the second temperature and pressure reducer (9) is connected with a second temperature reducing water inlet (N3), and an outlet of the second temperature and pressure reducer (9) is connected with a third interface of a second four-way joint (5); a fourth interface of the second four-way joint (5) is connected with a first inlet of the first temperature and pressure reducer (6), a second inlet of the first temperature and pressure reducer (6) is a first temperature reduction water inlet (N2), and an outlet of the first temperature and pressure reducer (6) is connected with a heat supply steam outlet (N4);
the control method comprises the following steps of,
s100, when the pressure ratio of the heating steam to the high-parameter superheated steam is larger than 0.7, opening a first shutoff valve (1) and a first temperature and pressure reducing device (6), closing a second shutoff valve (3), a third shutoff valve (7) and a second temperature and pressure reducing device (9), and introducing first temperature reducing water;
s200, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is 0.2-0.7, closing the first shut-off valve (1), the third shut-off valve (7) and the second temperature and pressure reducer (9), opening the second shut-off valve (3) and the first temperature and pressure reducer (6), and introducing first temperature and pressure reduction water;
s300, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is 0.05-0.2, closing the first shut-off valve (1) and the second shut-off valve (3), opening the third shut-off valve (7), the first temperature and pressure reducer (6) and the second temperature and pressure reducer (9), and introducing first temperature reduction water and second temperature reduction water;
s400, when the pressure ratio of the heat supply steam to the high-parameter superheated steam is less than 0.05, the pressure reduction and heat preservation system of the high-parameter superheated steam stops running.
2. The system of claim 1 and the control method thereof are characterized in that: the high-parameter steam refers to superheated steam with the pressure of 2.0-13.0 MPa, and the heat supply steam refers to superheated steam with the pressure of 0.2-0.7 MPa.
3. The system of claim 1 and the control method thereof are characterized in that: the first pressure reduction pore plate (4) and the second pressure reduction pore plate (8) are internally provided with large throttle holes (12) and small throttle holes (11) with variable quantity.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007071416A (en) * | 2005-09-05 | 2007-03-22 | Babcock Hitachi Kk | Reheat steam system of boiler, and control method of reheat steam temperature |
| CN205447268U (en) * | 2016-03-16 | 2016-08-10 | 山西中科国通新能源有限公司 | Steam jet air ejector temperature and pressure reduction system |
| CN107269326A (en) * | 2017-07-21 | 2017-10-20 | 广州恒足节能科技有限公司 | A kind of back pressure type steam turbine generating set system and its operation method |
| CN209704655U (en) * | 2018-01-08 | 2019-11-29 | 烟台清泉实业有限公司 | A kind of steam turbine reducing-and-cooling plant using steam waste heat ladder mode |
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2020
- 2020-06-29 CN CN202010601608.5A patent/CN111911909B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007071416A (en) * | 2005-09-05 | 2007-03-22 | Babcock Hitachi Kk | Reheat steam system of boiler, and control method of reheat steam temperature |
| CN205447268U (en) * | 2016-03-16 | 2016-08-10 | 山西中科国通新能源有限公司 | Steam jet air ejector temperature and pressure reduction system |
| CN107269326A (en) * | 2017-07-21 | 2017-10-20 | 广州恒足节能科技有限公司 | A kind of back pressure type steam turbine generating set system and its operation method |
| CN209704655U (en) * | 2018-01-08 | 2019-11-29 | 烟台清泉实业有限公司 | A kind of steam turbine reducing-and-cooling plant using steam waste heat ladder mode |
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