CN219387970U - System for improving economic and flexible operation of circulating water pump of steam power network - Google Patents
System for improving economic and flexible operation of circulating water pump of steam power network Download PDFInfo
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- CN219387970U CN219387970U CN202321029513.6U CN202321029513U CN219387970U CN 219387970 U CN219387970 U CN 219387970U CN 202321029513 U CN202321029513 U CN 202321029513U CN 219387970 U CN219387970 U CN 219387970U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 22
- 238000002955 isolation Methods 0.000 claims abstract description 9
- 238000003303 reheating Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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Abstract
The utility model belongs to the technical field of thermal generator sets, and particularly relates to a system for improving economic and flexible operation of a steam-driven heat supply network circulating water pump, which comprises a steam main pipe, a heat supply network heater and a steam-driven circulating water pump, wherein the steam-driven circulating water pump is connected with a small back pressure turbine, and the steam-driven circulating water pump is driven by the small back pressure turbine; the steam main pipe is communicated with the heating network heater through a steam extraction adjusting butterfly valve, the back pressure small turbine is communicated with the steam extraction adjusting butterfly valve through a small-sized steam main pipe of the steam circulation pump, and the small-sized steam main pipe of the steam circulation pump is communicated with the steam main pipe through a steam supply main pipe valve; and an isolation valve is arranged on the small machine steam main pipe of the steam-driven circulating pump. When the unit depth peak regulation is performed, the steam supply pressure of the heat supply network circulating pump turbine can be increased through the injection effect of the steam injector, and the unit electric load is further reduced under the condition that the minimum stable combustion load of the boiler is met.
Description
Technical Field
The utility model belongs to the technical field of thermal generator sets, and particularly relates to a system for improving economic and flexible operation of a circulating water pump of a steam-driven heat supply network.
Background
Along with the higher and higher requirements of national policies on the energy consumption level of the thermal power generating unit, the power supply coal consumption of the unit can be greatly reduced through urban heating, and good economic and social benefits are embodied. In northern areas of China, expansion of urban areas also requires active heat supply of thermal power generating units around the cities. In order to utilize the residual pressure and the residual heat of steam when a newly-built thermal power plant and a condensing unit are used for heat supply reconstruction, a steam heating network circulating water pump is usually arranged in a heating network system, and a steam source is used for heat supply and steam extraction of the unit.
During actual operation, the following problems (as shown in fig. 2) exist:
1. the heat supply unit generally adopts a middle-low pressure communicating pipe to punch and extract steam or adopts a middle-exhaust steam extraction adjusting butterfly valve 110 on a main pipe to provide steam for the heat supply network heater 20 and the steam-driven circulating water pump, and the heat supply steam enters the heat supply network heater and the small steam turbine in sequence through the adjusting butterfly valve and the steam main pipe, so that throttling matching is required according to different pressure levels, and the operation economy is poor.
2. In the actual operation process, the outlet temperature of the heat supply network circulating water is about 100 ℃, the operation pressure of the heat supply network heater is between 0.10 and 0.13MPa, the inlet pressure of a small turbine needs to be maintained above 0.20MPa to ensure the stable operation of a steam circulating water pump, and when the heat supply steam amount is small, an inlet steam butterfly valve of the heat supply network heater needs to be closed, a certain opening degree is maintained, and the heat supply network heater is not tightly closed after long-time steam scouring.
3. A large-scale power grid of a new energy unit such as a wind turbine generator system and the like causes the peak-valley difference of the thermal power unit to be increased, and a heat supply unit is required to have certain peak regulation capacity, otherwise, the power grid examination is caused. The heat supply transformation of the condensing unit adopts a cylinder cutting mode, the minimum steam cooling flow of the low-pressure cylinder is reserved, and the condensing unit has certain thermoelectric decoupling capacity. However, in the system arrangement, because the small-machine steam source of the circulating pump comes from the heat supply steam main pipe, when the pressure is lower than 0.20MPa, the temperature of the returned water of the circulating water is certain, the operation pressure of the preheater is kept unchanged, the differential pressure of the inlet and the outlet of the small machine is reduced, the work is insufficient, the output of the steam-driven circulating water pump is limited, and the requirement of the heat supply network system on the circulating water flow cannot be met. On the premise that the external heat supply quantity is certain and the boiler is higher than the lowest steady load, the further reduction of the load of the unit is limited, the peak shaving depth is influenced, and the unit is easy to check by a power grid in a spot transaction mode.
4. From the whole system configuration, when the unit load and the external heat supply quantity change, the steam circulation pump small machine and the heat supply network heater are limited by matching parameters such as steam flow, pressure and the like, and can only be adjusted by throttling a system valve and raising the unit load, so that the means are limited and the operation flexibility is poor.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a system for improving the economic and flexible operation of a circulating water pump of a steam-driven heat supply network, which ensures the output of the circulating pump of the heat supply network; the stability of the pumping force of the circulating pump and the adjustment flexibility are ensured, and the operation safety of the heat supply network system is ensured.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a system for improving economic and flexible operation of a steam power network circulating water pump comprises a steam main pipe, a heat network heater and a steam power circulating water pump, wherein the steam power circulating water pump is connected with a back pressure small turbine, and the steam power circulating water pump is driven by the back pressure small turbine; the steam main pipe is communicated with the heating network heater through a steam extraction adjusting butterfly valve, the back pressure small turbine is communicated with the steam extraction adjusting butterfly valve through a small-sized steam main pipe of the steam circulation pump, and the small-sized steam main pipe of the steam circulation pump is communicated with the steam main pipe through a steam supply main pipe valve; an isolation valve is arranged on the small machine steam main pipe of the steam-driven circulating pump; the heat supply steam in the steam main pipe enters the heat supply network heater through the steam extraction adjusting butterfly valve, and the heat supply steam in the steam main pipe sequentially enters the back pressure small steam turbine through the steam supply main pipe valve and the isolating valve.
The steam ejector is characterized by further comprising a steam ejector, wherein one inlet of the steam ejector is communicated with the steam supply main pipe valve through a low-pressure steam valve of the steam ejector;
the other inlet of the steam injector is sequentially communicated with a cold reheating supply network steam main pipe valve and a cold reheating supply steam injector pipeline valve; the outlet of the steam ejector is communicated with a small machine steam main pipe of the steam-driven circulating pump through a valve; the cold re-steam source is used as working steam of the steam injector, so that the flow of the re-heating steam of the boiler can be reduced.
The device also comprises a pressure reducing device, wherein an inlet of the pressure reducing device is communicated with a cold reheating network steam main pipe valve through an inlet valve, and an outlet of the pressure reducing device is communicated with a small machine steam main pipe of the steam-driven circulating pump through an outlet valve.
Three small back pressure turbines are arranged and are respectively communicated with a small engine steam main pipe of the steam-driven circulating pump through pipelines; and each back pressure small turbine is connected with a pneumatic circulating water pump.
The heating network heaters are arranged in four, wherein three heating network heaters are connected in parallel and then connected in series with another heating network heater.
Compared with the prior art, the utility model has the beneficial effects that:
when the unit depth peak regulation is performed, the steam supply pressure of the heat supply network circulating pump turbine can be increased through the injection effect of the steam injector, and the unit electric load is further reduced under the condition that the minimum stable combustion load of the boiler is met.
The pressure of the steam ejector is adjustable, the pressure and the flow of working steam (cold re-steam) are adjusted, the matched injection steam (heat supply main pipe steam) is adopted, and the steam pressure of the inlet of the heat supply network circulating pump steam turbine is continuously adjustable. Compared with the method of directly supplying the cold secondary steam or the auxiliary steam, the method has high efficiency and good economical efficiency.
After the load of the unit is increased, the ejector can be withdrawn at any time after the steam pressure of the heat supply main pipe meets the parameter requirement of the heat supply network circulating pump steam turbine, and the ejector is used for standby.
The bypass steam source of the steam injector directly uses cold re-steam and can be used as a reliable standby of the heat supply network circulating pump turbine.
The cold re-vapor source is used as the working vapor of the ejector, so that the flow of the reheat vapor of the boiler can be reduced, and the temperature of the reheat vapor of the hot section of the boiler during low load is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of a prior art structure;
wherein: 14. 15, 16 are backpressure small turbines, 17, 18, 19, 20 are heating network heaters, 21 are pressure reducing devices, 22 are steam ejectors, 102 are cold and heat supply network steam master valves, 103 are cold and heat supply steam ejector pipeline valves, 104 are inlet valves, 105 are steam supply master valves, 106 are steam ejector low-pressure steam valves, 107 are valves, 108 are outlet valves, 109 are steam master valves, 110 are steam extraction adjusting butterfly valves, 111 are steam circulation pump small machine steam master valves, and 112, 113 and 114 are isolation valves.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, a system for improving economic and flexible operation of a steam-driven heat supply network circulating water pump comprises a steam main pipe 109, a heat supply network heater and a steam-driven circulating water pump, wherein the steam-driven circulating water pump is connected with a back pressure small turbine, and the steam-driven circulating water pump is driven by the back pressure small turbine; the steam main pipe 109 is communicated with the heating network heater through a steam extraction adjusting butterfly valve 110, the back pressure small turbine is communicated with the steam extraction adjusting butterfly valve 110 through a small-sized steam main pipe 111 of the steam circulation pump, and the small-sized steam main pipe 111 of the steam circulation pump is communicated with the steam main pipe 109 through a steam supply main pipe valve 105; an isolation valve is arranged on the small machine steam main pipe 111 of the steam-driven circulating pump; the heating steam in the steam header 109 enters the heating network heater through the steam extraction adjusting butterfly valve 110, and the heating steam in the steam header 109 sequentially enters the back pressure small turbine through the steam header valve 105 and the isolation valve.
Specific: the three small back pressure turbines are respectively communicated with a small engine steam main pipe 111 of the pneumatic circulating pump through pipelines; and each back pressure small turbine is connected with a pneumatic circulating water pump.
The heating network heaters are provided with four (17, 18, 19, 20), wherein three heating network heaters are connected in parallel and then connected in series with another heating network heater.
In the above scheme, a middle-exhaust steam extraction valve 105 is added to a small-engine steam supply main pipe before a middle-pressure cylinder steam extraction pipeline heat supply steam extraction adjusting butterfly valve 110, and a circulating pump small engine (back pressure small turbine) 16 steam inlet isolation valve 112, a circulating pump small engine 15 (back pressure small turbine) steam inlet isolation valve 113 and a circulating pump small engine 14 (back pressure small turbine) steam inlet isolation valve 114 are respectively added to a steam-driven circulating pump small engine steam main pipe 111. The main function is that when the heat supply steam main pipe heats circulating water to the heat supply network heater 20 through the butterfly valve 110, the pressure of the small machine steam inlet main pipe of the circulating pump is not affected by the throttling of the butterfly valve 110, the medium exhaust pressure is ensured to be the same as the pressure of the small machine steam supply main pipe, so that the steam inlet pressure of the small machine is improved, and the output of the heat supply network circulating pump is ensured.
Further, the steam injector 22 is further included, and one inlet of the steam injector 22 is communicated with the steam supply main pipe valve 105 through the steam injector low-pressure steam valve 106;
the other inlet of the steam injector 22 is sequentially communicated with a valve 102 of a cold reheating network steam main pipe 109 and a valve 103 of a cold reheating steam injector pipeline; the outlet of the steam ejector is communicated with a small machine steam master pipe 111 of the steam circulation pump through a valve 107; the use of a cold reheat source as the working steam for the steam injector 22 reduces the boiler reheat steam flow.
By adding the steam injector 22 in the heat supply network system, cold section reheat steam is used as high-pressure power steam, a cold reheating heat supply network steam main pipe valve 102 and a cold reheating steam injector pipeline valve 103 are added, low-pressure steam is ejected to exhaust heat steam, the middle exhaust steam is extracted to a small machine steam main pipe valve 105, then a pipeline is led, and the middle exhaust steam is extracted to a steam injector low-pressure steam valve 106, and the steam boosted by the steam injector 22 is connected with a small machine steam main pipe of a steam-driven circulating pump through a valve 107 to provide a steam source higher than the middle exhaust pressure for a small machine, so that the circulating pump is ensured to stably operate.
Compared with an unmodified system, the pressure of the small engine steam inlet main pipe is improved, the pressure of the small engine steam inlet can be improved by about 20% through proper selection of the steam injector, and the unit load can be reduced by 5% -8%. The working steam pressure and flow can be adjusted by adjusting the cold re-supply steam ejector pipeline valve 103, the opening of the low-pressure steam valve 106 from the middle exhaust steam extraction to the steam ejector is kept unchanged, the steam ejector steam extraction pressure is changed along with the opening, the flexibility of the circulating pump small machine steam main pipe pressure is improved, and the normal operation of the heat supply network circulating water system is ensured.
Further, the device also comprises a pressure reducing device 21, wherein an inlet of the pressure reducing device 21 is communicated with a valve 102 of a cold reheat net steam master pipe 109 through an inlet valve 104, and an outlet of the pressure reducing device 21 is communicated with a small engine steam master pipe 111 of a pneumatic circulating pump through an outlet valve 108. The pressure reducing device 21 and the inlet valve 104 and the outlet valve 108 of the cold re-supplying small machine steam main pipe are added, when the deep peak regulation and the middle exhaust pressure reduction value of the unit are 0.2MPa, cold re-steam can be directly used for directly supplying the cold re-steam to the circulating pump steam main pipe after pressure reduction, high-pressure steam is provided for the small machine, and the normal operation of the heat supply network circulating water pump is ensured.
In the scheme, the back pressure machine (a small back pressure turbine) and the circulating pump (a steam-driven circulating water pump) are driven by the steam ejector exhaust. The operation mode is as follows: when the unit runs under low load, the medium exhaust pressure is reduced, the pressure of the heat supply steam extraction main pipe is reduced, the output of the back pressure machine is reduced, the rotation speed of the circulating pump is reduced, and the output is reduced. And the steam ejector is used for ejecting heat supply steam extraction main pipe steam by reheating steam at the cold section of the unit, the outlet pressure of the steam ejector is increased, the inlet pressure of the back pressure machine is increased, and the output of the circulating pump is kept unchanged. And the exhaust steam of the back pressure machine enters a low-pressure heater to heat the circulating water of the heat supply network. The unit electrical load can be further reduced.
When the unit load is lower, the extraction pressure of each section of the steam turbine is reduced, the pressure of the heat supply steam main pipe is reduced, the steam source pressure of the heat supply network circulating water pump steam turbine is reduced, and when the lower limit value is reached, the output of the steam circulation pump water pump is reduced, and under the condition of a certain external heat supply quantity, the unit electric load is the lower limit of the unit output.
When the ejector is in fault or in an overhauling state, the bypass can be used for normally supplying steam to the heat supply network circulating pump turbine, and low-load operation of the unit is not affected.
The preferred embodiments of the present utility model have been described in detail, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present utility model, and the various changes are included in the scope of the present utility model.
Claims (5)
1. A system for improving economic and flexible operation of a circulating water pump of a steam-driven heat supply network is characterized in that: the device comprises a steam main pipe (109), a heat supply network heater and a steam-driven circulating water pump, wherein the steam-driven circulating water pump is connected with a back pressure small turbine, and the steam-driven circulating water pump is driven by the back pressure small turbine; the steam main pipe (109) is communicated with the heating network heater through a steam extraction adjusting butterfly valve (110), the back pressure small turbine is communicated with the steam extraction adjusting butterfly valve (110) through a small machine steam main pipe (111) of the steam circulation pump, and the small machine steam main pipe (111) of the steam circulation pump is communicated with the steam main pipe (109) through a steam supply main pipe valve (105); an isolation valve is arranged on the small machine steam main pipe (111) of the steam-driven circulating pump; the heat supply steam in the steam main pipe (109) enters the heat supply network heater through the steam extraction adjusting butterfly valve (110), and the heat supply steam in the steam main pipe (109) sequentially enters the back pressure small turbine through the steam supply main pipe valve (105) and the isolating valve.
2. The system for improving the economic and flexible operation of the circulating water pump of the steam power network according to claim 1, wherein the system is characterized in that: the steam generator also comprises a steam injector (22), wherein one inlet of the steam injector (22) is communicated with the steam supply main pipe valve (105) through a steam injector low-pressure steam valve (106);
the other inlet of the steam injector (22) is sequentially communicated with a cold re-heating network steam master pipe (109) valve (102) and a cold re-heating network steam injector pipeline valve (103); the outlet of the steam ejector is communicated with a small machine steam master pipe (111) of the steam circulation pump through a valve (107); the cold re-vapor source is used as the working vapor of the vapor injector (22), so that the flow of the re-heating vapor of the boiler can be reduced.
3. The system for improving the economic and flexible operation of the circulating water pump of the steam power network according to claim 1, wherein the system is characterized in that: the device also comprises a pressure reducing device (21), wherein an inlet of the pressure reducing device (21) is communicated with a valve (102) of a cold reheating network steam main pipe (109) through an inlet valve (104), and an outlet of the pressure reducing device (21) is communicated with a small machine steam main pipe (111) of the pneumatic circulating pump through an outlet valve (108).
4. A system for improving the economic and flexible operation of a circulation water pump for a steam-driven heat supply network according to any one of claims 1 to 3, wherein: three small back pressure turbines are arranged and are respectively communicated with a small engine steam main pipe (111) of the steam-driven circulating pump through pipelines; and each back pressure small turbine is connected with a pneumatic circulating water pump.
5. The system for improving the economic and flexible operation of the circulating water pump of the steam power network according to claim 1, wherein the system is characterized in that: the heating network heaters are arranged in four, wherein three heating network heaters are connected in parallel and then connected in series with another heating network heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321029513.6U CN219387970U (en) | 2023-05-04 | 2023-05-04 | System for improving economic and flexible operation of circulating water pump of steam power network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321029513.6U CN219387970U (en) | 2023-05-04 | 2023-05-04 | System for improving economic and flexible operation of circulating water pump of steam power network |
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| CN219387970U true CN219387970U (en) | 2023-07-21 |
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| CN202321029513.6U Active CN219387970U (en) | 2023-05-04 | 2023-05-04 | System for improving economic and flexible operation of circulating water pump of steam power network |
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2023
- 2023-05-04 CN CN202321029513.6U patent/CN219387970U/en active Active
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