CN210178431U - System for cutting cylinder operation under partial load for steam turbine with multiple low-pressure cylinders - Google Patents
System for cutting cylinder operation under partial load for steam turbine with multiple low-pressure cylinders Download PDFInfo
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- CN210178431U CN210178431U CN201920837671.1U CN201920837671U CN210178431U CN 210178431 U CN210178431 U CN 210178431U CN 201920837671 U CN201920837671 U CN 201920837671U CN 210178431 U CN210178431 U CN 210178431U
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Abstract
The utility model provides a system to many low pressure cylinder steam turbines cut jar operation under the part load, when the part load pure operating mode down moves, through excision part low pressure jar, the rethread steam extraction pipeline lets in a small amount of controllable steam and takes away the thermal mode of blade blast air friction and ensures to be amputated low pressure jar safe operation. Under the working condition of partial cylinder cutting and pure condensation, for the low-pressure cylinder which is not cut, the pressure of each stage of steam extraction is improved, and under the condition that the upper end difference of each stage of heater is basically unchanged, the enthalpy of the condensed water outlet of each stage of low-pressure heater is increased, the steam extraction quantity of each stage of low-pressure heating system is increased, and the steam extraction quantity of the deaerator is reduced. On the whole, under the condition of the same steam inlet quantity of the steam turbine, the exhaust steam quantity of the steam turbine is reduced, the exhaust steam loss of the steam turbine is reduced, and the heat efficiency is improved; and for the cut low-pressure cylinder, the flow of cooling steam entering the cut low-pressure cylinder is adjusted through a steam flow control valve group, so that the phenomenon of overtemperature after blast friction of last-stage blades is prevented.
Description
Technical Field
The utility model relates to a system to many low pressure cylinder steam turbines cut jar operation under partial load pure operating mode belongs to steam turbine operation technical field.
Background
In recent years, the contradiction between supply and demand of power production in China is prominent, a large number of high-power thermal power generating units operate for a long time at 50% rated load, and the energy consumption of the units is increased. In this context, a reduction of the energy consumption at partial load can be achieved by means of a partial low-pressure cylinder of the machine block being cut off. When the low pressure cylinder is partially cut, in order to prevent the steam of the low pressure heater in the low pressure cylinder which is not cut from leaking into the cut low pressure cylinder, the steam extraction port of the low pressure heater corresponding to the cut low pressure cylinder portion needs to be cut. Therefore, the steam inlet amount of the low-pressure heating system is correspondingly reduced, and the energy consumption level of the unit is increased after the cylinder is cut.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: when the multi-low-pressure-cylinder steam turbine operates under the partial-load pure condensing working condition, the extraction steam volume of the low-pressure heater is increased on the basis of the same steam inlet volume, and the energy consumption of the unit after cylinder cutting is reduced.
In order to solve the technical problem, the technical scheme of the utility model is to provide a system to many low pressure cylinder steam turbines cut jar operation under partial load, its characterized in that: the low-pressure steam extraction and regulation system comprises a low-pressure cylinder cutting system and a low-pressure heater steam extraction and regulation system;
the low-pressure cylinder cutting system comprises an intermediate-pressure cylinder, a steam outlet of the intermediate-pressure cylinder is connected with a steam inlet of a first low-pressure cylinder and a steam inlet of a second low-pressure cylinder, the steam outlet of the first low-pressure cylinder and the steam outlet of the second low-pressure cylinder are both connected with an inlet of a condenser, an outlet of the condenser is connected with an inlet at the low-temperature side of a low-pressure heater, and a control steam inlet valve is arranged on a pipeline connecting the steam outlet of the intermediate-pressure cylinder and the first steam inlet of the second low-pressure cylinder;
the low-pressure heater steam extraction regulating system comprises a steam extraction flow control valve group, a flowmeter and a thermometer, wherein a steam extraction port of the first low-pressure cylinder is connected with a high-temperature side inlet of the low-pressure heater and a second steam inlet of the second low-pressure cylinder; and a steam extraction flow control valve group, a flowmeter and a thermometer are arranged on a pipeline connecting the steam extraction port of the first low pressure cylinder and the second steam inlet of the second low pressure cylinder.
Preferably, the second low-pressure cylinder is provided with one or more than one, a first steam inlet of each second low-pressure cylinder is provided with the steam control inlet valve, and a second steam inlet of each second low-pressure cylinder is provided with the steam extraction flow control valve group, the flow meter and the thermometer.
Compared with the prior art, the utility model provides a system to many low pressure cylinder steam turbines cut jar operation under partial load has following beneficial effect:
(1) the control steam inlet valve with the cutting-off function is added at the inlet of the low-pressure cylinder to be cut off for cutting off the steam inlet of the low-pressure cylinder to be cut off, so that the operation of cutting off the low-pressure cylinder under partial load is realized;
(2) the method is characterized in that an isolation (shutoff) valve, a regulating valve and the like are additionally arranged on a steam extraction pipe section from a low-pressure cylinder to be cut to a low-pressure heater system, so that the flow of cooling steam entering the cut low-pressure cylinder is controlled, and the blades which are generated by the friction heating of last stages of blast air in the cut low-pressure cylinder are cooled;
(3) the low-pressure heater system is put into operation under the condition of cutting off partial low-pressure cylinder steam admission, because the steam extraction port pressure increases corresponding to the low-pressure cylinder without cut off steam admission, under the principle that the upper end difference of the low-pressure heater is maintained to be basically unchanged, the outlet water supply temperature of the low-pressure heater is increased, the steam extraction flow of the low-pressure heater is increased, the inlet water supply temperature of the deaerator is improved on the premise of realizing the steam admission quantity of the same steam turbine, the high-grade steam extraction is reduced, the steam exhaust quantity of the steam turbine is reduced on the whole, and the effect of reducing the steam exhaust loss of the steam turbine is achieved. And aiming at the low-pressure cylinder with cut steam inlet, the steam extraction flow control valve group on the pipeline of the part of the cut low-pressure cylinder is adjusted, so that the flow of cooling steam entering the low-pressure cylinder can be adjusted simultaneously, and the phenomenon of overtemperature after blast friction of last stages of blades is prevented.
Drawings
FIG. 1 is a schematic diagram of a system for split-cylinder operation of a multiple low pressure cylinder steam turbine under partial load according to the present embodiment;
description of reference numerals:
1-intermediate pressure cylinder; 2-a first low pressure cylinder; 3-second low pressure cylinder; 4, a condenser; 5-low pressure heater; 6-controlling the steam inlet valve; 7-steam extraction flow control valve group; 8, a flow meter; 9-thermometer.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Fig. 1 is a schematic diagram of a system for switching a cylinder operation of a multiple low-pressure cylinder steam turbine under a partial load according to this embodiment, where the system for switching a cylinder operation of a multiple low-pressure cylinder steam turbine under a partial load includes two subsystems: a low pressure cylinder cut-off system and a low pressure heater extraction regulation system.
The low-pressure cylinder cutting system comprises an intermediate pressure cylinder 1, wherein a steam exhaust port of the intermediate pressure cylinder 1 is connected with a steam inlet of a first low-pressure cylinder 2 and a steam inlet of a second low-pressure cylinder 3, the steam exhaust port of the first low-pressure cylinder 2 and the steam exhaust port of the second low-pressure cylinder 3 are connected with an inlet of a condenser 4, an outlet of the condenser 4 is connected with an inlet of a low-temperature side of a low-pressure heater 5, and a control steam inlet valve 6 is arranged on a pipeline connecting the steam exhaust port of the intermediate pressure cylinder 1 and the first steam inlet of the second low-pressure cylinder 3.
The low-pressure heater steam extraction regulating system comprises a steam extraction flow control valve group 7, a flowmeter 8, a thermometer 9 and the like, wherein a steam extraction port of the first low-pressure cylinder 2 is connected with a high-temperature side inlet of the low-pressure heater 5 and a second steam inlet of the second low-pressure cylinder 3. And a steam extraction flow control valve group 7, a flowmeter 8 and a thermometer 9 are arranged on a pipeline for connecting the steam extraction port of the first low pressure cylinder 2 with the second steam inlet of the second low pressure cylinder 3.
When the system for the cylinder switching operation of the multi-low-pressure-cylinder steam turbine under the partial load is used, the method comprises the following steps:
the method comprises the following steps: when the unit is operated under the pure condensing part load working condition, the control steam inlet valve 6 of the low-pressure cylinder cutting system keeps an open state, and the steam extraction control valve group 7 of the low-pressure heater steam extraction regulating system keeps a full open state;
step two: when the cylinder cutting operation is carried out under the pure condensing part load working condition of the unit, for a low-pressure cylinder cutting system, a control steam inlet valve 6 at a first steam inlet of the cut second low-pressure cylinder 3 is closed; for the low-pressure heater steam extraction regulating system, the low-pressure heater 5 is put into operation, and in order to prevent the steam extraction of the part of the first low-pressure cylinder 2 which is not cut off from leaking into the second low-pressure cylinder 3 which is cut off, a steam extraction flow control valve group 7 at a second steam inlet of the second low-pressure cylinder 3 is closed;
step three: and according to the measurement data of the flow meter 8 and the thermometer 9 corresponding to the cut part of the second low pressure cylinder 3 in the low pressure heater steam extraction regulating system, changing the flow of the cooling steam entering the cut part of the second low pressure cylinder 3 by regulating the series of opening degrees of the steam extraction flow control valve group 7 on the steam extraction pipeline of the cut part of the second low pressure cylinder 3, and cooling the temperature of the last stage of blades of the cut part of the second low pressure cylinder 3.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the method of the present invention, and such modifications and additions are also considered to be within the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.
Claims (2)
1. A system for switching cylinders of a multiple low pressure cylinder steam turbine at partial load, comprising: the low-pressure steam extraction and regulation system comprises a low-pressure cylinder cutting system and a low-pressure heater steam extraction and regulation system;
the low-pressure cylinder cutting system comprises a medium-pressure cylinder (1), wherein a steam exhaust port of the medium-pressure cylinder (1) is connected with a steam inlet of a first low-pressure cylinder (2) and a first steam inlet of a second low-pressure cylinder (3), the steam exhaust ports of the first low-pressure cylinder (2) and the second low-pressure cylinder (3) are connected with an inlet of a condenser (4), an outlet of the condenser (4) is connected with an inlet of a low-temperature side of a low-pressure heater (5), and a control steam inlet valve (6) is arranged on a pipeline connecting the steam exhaust port of the medium-pressure cylinder (1) and the first steam inlet of the second low-pressure cylinder (3);
the low-pressure heater steam extraction regulating system comprises a steam extraction flow control valve group (7), a flowmeter (8) and a thermometer (9), wherein a steam extraction port of the first low-pressure cylinder (2) is connected with a high-temperature side inlet of the low-pressure heater (5) and a second steam inlet of the second low-pressure cylinder (3); and a steam extraction flow control valve group (7), a flowmeter (8) and a thermometer (9) are arranged on a pipeline connecting a steam extraction port of the first low pressure cylinder (2) and a second steam inlet of the second low pressure cylinder (3).
2. The system for split-cylinder operation at part load for a multiple low pressure cylinder steam turbine of claim 1, wherein: the second low pressure jar (3) are equipped with one or more, every the first steam inlet department of second low pressure jar (3) all is equipped with control admission valve (6), every the second steam inlet department of second low pressure jar (3) all is equipped with steam extraction flow control valves (7), flowmeter (8), thermometer (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920837671.1U CN210178431U (en) | 2019-06-05 | 2019-06-05 | System for cutting cylinder operation under partial load for steam turbine with multiple low-pressure cylinders |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920837671.1U CN210178431U (en) | 2019-06-05 | 2019-06-05 | System for cutting cylinder operation under partial load for steam turbine with multiple low-pressure cylinders |
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| CN210178431U true CN210178431U (en) | 2020-03-24 |
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| CN201920837671.1U Active CN210178431U (en) | 2019-06-05 | 2019-06-05 | System for cutting cylinder operation under partial load for steam turbine with multiple low-pressure cylinders |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159371A (en) * | 2019-06-05 | 2019-08-23 | 国家电投集团河南电力有限公司开封发电分公司 | Cut the system and method for cylinder operation at part load for more low pressure (LP) cylinder steam turbines |
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2019
- 2019-06-05 CN CN201920837671.1U patent/CN210178431U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159371A (en) * | 2019-06-05 | 2019-08-23 | 国家电投集团河南电力有限公司开封发电分公司 | Cut the system and method for cylinder operation at part load for more low pressure (LP) cylinder steam turbines |
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Effective date of registration: 20200612 Address after: No. 10, Huanghe East Road, Zhengdong New District, Zhengzhou City, Henan Province Co-patentee after: KAIFENG POWER GENERATION BRANCH OF HENAN ELECTRIC POWER CO., LTD., STATE POWER INVESTMENT Corp. Patentee after: State Power Investment Group Henan Electric Power Co.,Ltd. Co-patentee after: SHANGHAI POWER EQUIPMENT RESEARCH INSTITUTE Co.,Ltd. Address before: 475000 East Side of the Old Factory Area of Kaifeng Thermal Power Plant to the North of Xincao Road, Kaifeng City, Henan Province Co-patentee before: SHANGHAI POWER EQUIPMENT RESEARCH INSTITUTE Co.,Ltd. Patentee before: KAIFENG POWER GENERATION BRANCH OF HENAN ELECTRIC POWER CO., LTD., STATE POWER INVESTMENT Corp. |