CN113107624A - Multi-heat-source steam supply system meeting high-pressure industrial steam supply and working method - Google Patents
Multi-heat-source steam supply system meeting high-pressure industrial steam supply and working method Download PDFInfo
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- CN113107624A CN113107624A CN202110567907.6A CN202110567907A CN113107624A CN 113107624 A CN113107624 A CN 113107624A CN 202110567907 A CN202110567907 A CN 202110567907A CN 113107624 A CN113107624 A CN 113107624A
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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
- F01K13/00—General layout or general methods of operation of complete plants
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
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Abstract
The invention discloses a multi-heat-source steam supply system and a working method for meeting high-pressure industrial steam supply. At high load, the industrial steam supply source comes from hot re-steam; when the load is medium and high, the industrial steam supply source still comes from the hot re-steam, but the intermediate connection door needs to be moderately suppressed to meet the industrial steam supply pressure; and at low load, the industrial steam supply source is operated by main steam. The operation mode is flexible, the requirements of industrial steam supply quality and steam supply quantity can be guaranteed, the limitation of the parameter adjusting capability of the middle-connection door can be removed, and the wide-range, safe and stable operation of the unit under the deep peak adjusting state is really realized.
Description
Technical Field
The invention belongs to the field of cogeneration heat supply of coal-fired generator sets, and particularly relates to a multi-heat-source steam supply system meeting high-pressure industrial steam supply and a working method.
Background
With the rapid development of renewable energy sources and the increasing severity of air pollution problems, the power grid function of the coal-fired thermal power generating unit is gradually changed from a main body to an electric power regulation type, the peak regulation capability of the existing system of the unit is fully developed, and the operation flexibility of the unit is increased to the maximum extent. When the coal-fired generating set frequently participates in deep peak regulation, the unit for bearing industrial steam supply must ensure the reliability and stability of steam supply parameters, and the requirements of steam utilization enterprises need to be met according to quality and quantity, so that the problem of production reduction and even production stop caused by the reduction of steam quality and steam quantity of the steam utilization enterprises is avoided, and serious economic loss is caused.
A large number of coal-fired generating sets undertake external industrial steam supply through technical transformation, wherein a heat re-pipeline steam supply technology based on central connection door adjustment is generally applied. The industrial steam supply technology belongs to adjustable steam extraction, and when a high-power load of a unit operates, hot re-steam meets the steam supply requirement without a middle connection door to participate in adjustment. When the unit operates under medium and high electric loads, the intermediate connection door needs to be properly pressed to ensure the steam supply pressure. When the electric load of the unit is further reduced, the intermediate door needs to be further closed, and the pressure of the hot re-steam is greatly increased so as to maintain the stability of the pressure and the flow of the industrial steam supply. However, when the intermediate connection door is in a pressure-building state, the pressure difference between the front and the rear of the intermediate connection door is not too large, otherwise, the operation safety of the valve is influenced, and even safety accidents such as valve rod breakage and the like are caused. Therefore, the adjusting capacity of the middle-connection door is very limited, and is a main factor for limiting the wide-area operation of the steam supply unit.
The operation range of the heat-and-steam-extraction adjustable technology based on the intermediate connection door parameter adjustment is narrow, the contradiction between the deep peak adjustment requirement of the coal-electric unit and the steam supply capacity guarantee is difficult to effectively solve, and the current scheme of improving the parameter adjustment capacity of the intermediate connection door through the improvement of the intermediate connection door has the defects of high investment cost, incapability of meeting the unit limit deep adjustment effect and the like.
Disclosure of Invention
The invention aims to solve the problems that the contradiction between the narrow operation range of a unit, the deep peak regulation requirement and the guarantee of the low-load industrial steam supply capacity is difficult to effectively solve due to the limited parameter regulation capacity of a middle connecting door in the actual application of the existing heat re-pipeline industrial steam supply technology, and provides a multi-heat-source steam supply system and a working method for meeting the requirement of high-pressure industrial steam supply.
In order to achieve the aim, the multi-heat-source steam supply system meeting the requirement of high-pressure industrial steam supply comprises a boiler, a high-pressure cylinder and an intermediate pressure cylinder;
the boiler is connected with the steam inlet side of the high-pressure cylinder through a main steam pipeline, and the steam exhaust side of the high-pressure cylinder is connected with the boiler through a cold re-pipeline;
the boiler is connected with the intermediate pressure cylinder through a hot re-pipeline, and the hot re-pipeline is connected with the industrial steam supply main pipeline.
The main industrial steam supply pipeline is provided with a main pressure reducing valve, a main desuperheater and a main stop valve.
The main steam pipeline is connected with the soot blowing pipeline of the body.
The body soot blowing pipeline is connected with an industrial steam supply auxiliary pipeline.
An auxiliary pressure reducing valve, an auxiliary desuperheater and an auxiliary stop valve are arranged on the industrial steam supply auxiliary pipeline.
The hot recycling pipeline is provided with a middle connection door.
The main industrial steam supply pipeline is arranged at the steam extraction position of the hot re-pipeline and is arranged at the upstream of the middle joint door.
A working method of a multi-heat-source steam supply system meeting high-pressure industrial steam supply is characterized in that when a unit operates at high load, industrial steam supply comes from an industrial steam supply main pipeline, and hot re-steam is supplied outwards after temperature and pressure reduction;
when the unit operates at medium and high load, industrial steam supply comes from an industrial steam supply main pipeline, the middle joint door is partially opened, and hot re-steam is pressurized to meet the industrial steam supply pressure;
when the steam generator set runs at a low load, industrial steam supply comes from an industrial steam supply auxiliary pipeline, and main steam is supplied outwards after temperature and pressure reduction.
When the unit operates above medium and high load, the main stop valve is opened, and the auxiliary stop valve is closed.
When the unit operates at low load, the main stop valve is closed, and the auxiliary stop valve is opened.
Compared with the prior art, the industrial steam supply auxiliary pipeline is arranged on the soot blowing pipeline of the body, so that an industrial steam supply mode of main steam is realized, steam introduction caused by direct punching of the main steam pipe is avoided, and potential safety hazards of construction and workload of reconstruction are reduced. At high load, the industrial steam supply source comes from hot re-steam; when the load is medium and high, the industrial steam supply source still comes from the hot re-steam, but the intermediate connection door needs to be moderately suppressed to meet the industrial steam supply pressure; and at low load, the industrial steam supply source is operated by main steam. The operation mode is flexible, the requirements of industrial steam supply quality and steam supply quantity can be guaranteed, the limitation of the parameter adjusting capability of the middle-connection door can be removed, and the wide-range, safe and stable operation of the unit under the deep peak adjusting state is really realized.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
the system comprises a boiler 1, a boiler 2, a high-pressure cylinder 3, an intermediate-pressure cylinder 4, a main steam pipeline 5, a cold re-pipeline 6, a hot re-pipeline 7, an industrial steam supply main pipeline 8, an industrial steam supply auxiliary pipeline 9, a middle connection door 10, a main pressure reducing valve 11, a main desuperheater 12, a main stop valve 13, an auxiliary pressure reducing valve 14, an auxiliary desuperheater 15, an auxiliary stop valve 16 and a soot blowing pipeline body.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, a multi-heat source steam supply system satisfying high-pressure industrial steam supply mainly comprises a boiler 1, a high-pressure cylinder 2 and a medium-pressure cylinder 3; the boiler 1 is connected with the steam inlet side of the high-pressure cylinder 2 through a main steam pipeline 4, and the steam exhaust side of the high-pressure cylinder 2 is connected with the boiler 1 through a cold re-pipeline 5; the boiler 1 is connected with the intermediate pressure cylinder 3 through a hot re-pipeline 6, and the hot re-pipeline is connected with an industrial steam supply main pipeline.
Part of the steam in the hot re-pipeline 6 enters an industrial steam supply main pipeline 7, and the rest part of the steam enters the intermediate pressure cylinder 3; part of the steam in the main steam pipeline 4 enters the body soot blowing pipeline 16, and the rest part of the steam enters the high-pressure cylinder 2. Part of the steam in the main body soot blowing pipeline 16 enters the industrial steam supply auxiliary pipeline 8, and the rest part of the steam is used as a soot blowing steam source.
A main pressure reducing valve 10, a main desuperheater 11 and a main stop valve 12 are arranged on the industrial steam supply main pipeline 7; an auxiliary pressure reducing valve 13, an auxiliary desuperheater 14 and an auxiliary stop valve 15 are arranged on the industrial steam supply auxiliary pipeline 8.
The hot recycling pipeline 6 is provided with a middle connection door 9; the main industrial steam supply conduit 7 is upstream of the central coupling door 9 at the extraction point of the hot re-conduit.
When the unit runs at high load, the main stop valve 12 is opened, the auxiliary stop valve 15 is closed, industrial steam supply comes from the industrial steam supply main pipeline 7, the intermediate door 9 does not participate in regulation at the moment, and hot steam is supplied outwards after temperature and pressure reduction; when the unit operates at medium and high load, the main stop valve 12 is opened, the auxiliary stop valve 15 is closed, industrial steam supply comes from the industrial steam supply main pipeline 7, the intermediate connection door 9 is closed, and the pressure of hot re-steam is moderately increased to meet the industrial steam supply pressure; when the unit operates at low load, the main stop valve 12 is closed, the auxiliary stop valve 15 is opened, industrial steam is supplied from the industrial steam supply auxiliary pipeline 8, and main steam is supplied outwards after temperature and pressure reduction.
Example (b):
a1000 MW unit turbine of a certain power plant is an N1000-25/600/600 type, ultra-supercritical, single-shaft, four-cylinder, four-steam-exhaust, once-intermediate-reheating and condensing turbine manufactured by Orient steam turbine Limited, and needs to bear external high-pressure steam supply parameters of 3.1MPa, 310 ℃ and 220t/h, and a steam extraction position is a heat re-pipeline.
When the middle coupling door is involved in adjustment, the lowest operation load of the unit after checking by a manufacturing plant is 530MW when 220t/h high-pressure steam supply is born under the influence of the adjustment characteristic of the middle coupling door and the axial thrust. If the unit deep peak shaving needs to further reduce the electric load, the hot exhaust pressure can not meet the steam requirement.
After the invention is used for transformation, when the electrical load of the unit is lower than 530MW, the steam source comes from the main steam pipeline. After accounting, when the unit is deeply peak-regulated to 30% THA (300MW) load operation, the steam supply pressure of 3.1MPa can still be met, the unit operation flexibility is greatly improved, and the full-load wide-area operation of the unit is really realized.
Claims (10)
1. A multi-heat-source steam supply system meeting high-pressure industrial steam supply is characterized by comprising a boiler (1), a high-pressure cylinder (2) and a medium-pressure cylinder (3);
the boiler (1) is connected with the steam inlet side of the high-pressure cylinder (2) through a main steam pipeline (4), and the steam exhaust side of the high-pressure cylinder (2) is connected with the boiler (1) through a cold re-pipeline (5);
the boiler (1) is connected with the intermediate pressure cylinder (3) through a hot re-pipeline (6), and the hot re-pipeline (6) is connected with an industrial steam supply main pipeline (7).
2. A multi-heat-source steam supply system for high-pressure industrial steam supply according to claim 1, characterized in that a main pressure reducing valve (10), a main desuperheater (11) and a main stop valve (12) are arranged on the main industrial steam supply pipeline (7).
3. A multi-heat-source steam supply system for high-pressure industrial steam supply according to claim 1, characterized in that the main steam pipe (4) is connected with the body soot blowing pipe (16).
4. A multiple heat source steam supply system for high pressure industrial steam supply according to claim 1, wherein the body soot blowing pipe (16) is connected with the auxiliary industrial steam supply pipe (8).
5. A multi-heat-source steam supply system for high-pressure industrial steam supply according to claim 4, characterized in that an auxiliary pressure reducing valve (13), an auxiliary desuperheater (14) and an auxiliary stop valve (15) are arranged on the auxiliary industrial steam supply pipeline (8).
6. A multi-heat-source steam supply system for high-pressure industrial steam supply according to claim 1, characterized in that the heat re-pipe (6) is provided with a central connection door (9).
7. A multi-heat-source steam supply system for high-pressure industrial steam supply according to claim 1, characterized in that the main industrial steam supply pipeline (7) is upstream of the central connection door (9) at the steam extraction position of the heat re-pipeline.
8. The working method of the multi-heat-source steam supply system for high-pressure industrial steam supply in claim 1 is characterized in that when the unit is in high-load operation, industrial steam supply comes from an industrial steam supply main pipeline (7), and hot re-steam is supplied outwards after temperature and pressure reduction;
when the unit operates at medium and high load, industrial steam supply comes from an industrial steam supply main pipeline (7), a middle connection door (9) is partially opened, and pressure is raised on hot re-steam to meet the industrial steam supply pressure;
when the unit operates at low load, the industrial steam supply comes from an industrial steam supply auxiliary pipeline (8), and the main steam is supplied outwards after temperature and pressure reduction.
9. The working method of the multi-heat-source steam supply system for high-pressure industrial steam supply according to claim 8, wherein when the unit operates above medium and high load, the main stop valve (12) is opened, and the auxiliary stop valve (15) is closed.
10. The operating method of a multi-heat-source steam supply system for high-pressure industrial steam supply according to claim 8, wherein when the unit is in low-load operation, the main stop valve (12) is closed and the auxiliary stop valve (15) is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110567907.6A CN113107624A (en) | 2021-05-24 | 2021-05-24 | Multi-heat-source steam supply system meeting high-pressure industrial steam supply and working method |
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| CN202110567907.6A CN113107624A (en) | 2021-05-24 | 2021-05-24 | Multi-heat-source steam supply system meeting high-pressure industrial steam supply and working method |
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| CN113107624A true CN113107624A (en) | 2021-07-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060105A (en) * | 2021-10-19 | 2022-02-18 | 国能(福州)热电有限公司 | Cogeneration central heating system and control method thereof |
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2021
- 2021-05-24 CN CN202110567907.6A patent/CN113107624A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060105A (en) * | 2021-10-19 | 2022-02-18 | 国能(福州)热电有限公司 | Cogeneration central heating system and control method thereof |
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