CN105019957A - Efficient heat regenerative system and method - Google Patents
Efficient heat regenerative system and method Download PDFInfo
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- CN105019957A CN105019957A CN201510448461.XA CN201510448461A CN105019957A CN 105019957 A CN105019957 A CN 105019957A CN 201510448461 A CN201510448461 A CN 201510448461A CN 105019957 A CN105019957 A CN 105019957A
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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]
Abstract
The invention relates to an efficient heat regenerative system and method. The efficient heat regenerative system comprises a high pressure cylinder, an intermediate pressure cylinder and a low pressure cylinder which are communicated in sequence. The efficient heat regenerative system further comprises a pressure header and an extraction back-pressure type feed pump turbine. The pressure header is provided with at least two steam inlets. One steam extraction opening of the intermediate pressure cylinder is communicated with one steam inlet of the pressure header. A steam exhaust outlet of the feed pump turbine is communicated with the other steam inlet of the pressure header. A steam exhaust outlet of the pressure header is communicated with a steam inlet of each heat regenerative device. A steam inlet of the feed pump turbine is communicated with a steam exhaust outlet or a steam extraction opening of the high pressure cylinder or the other steam extraction opening of the intermediate pressure cylinder. The steam exhaust pressure of the feed pump turbine is controlled by normal steam exhaust of the feed pump turbine, steam extraction and supplementation of the intermediate pressure cylinder and an overflow system, and exhaust back pressure can be effectively controlled within a reasonable value under the condition that the pressure of the pressure header is fixed and a unit has different loads. The steam exhaust humidity can be guaranteed, efficient operation of the feed pump turbine is ensured, and the problems of overpressure of a deaerator and cavitation of a feed pump are avoided.
Description
Technical field
The present invention relates to power technology, particularly the efficient heat regenerative system of one and method.
Background technique
In order to improve the thermal power generation unit efficiency of cycle, steam turbine generally adopts backheat technology, namely extract a part out from main steam turbine intergrade and do the steam of a certain amount of merit, be supplied to backheat equipment heating boiler feed water, the feed water pump of Conventional mass thermal power generation unit is generally pure condensed steam formula feed pump turbine, pure condensed steam formula feed pump turbine itself is not established and is drawn gas, exhaust pressure is low, high humidity, what blade efficiency of end is low, therefore the efficiency of pure condensed steam formula feed pump turbine own and unit backheat whole efficiency often not high.A kind of new scheme is the feed pump turbine adopting back pressure extraction, but the exhaust steam pressure size of the feed pump turbine of back pressure type can affect the exhaust steam moisture of feed pump turbine, thus affect its operational efficiency, for stable feed pump turbine exhaust steam pressure, there is employing that the mode of the steam flow balance tube being communicated with main steam turbine intermediate pressure cylinder exhaust steam pipe and feed pump turbine exhaust steam pipe is set in systems in which, when feed pump turbine steam discharge is low, can from the filling of main steam turbine intermediate pressure cylinder exhaust steam pipe; During feed pump turbine steam discharge height, can overflow to main steamer intermediate pressure cylinder exhaust steam pipe, finally go to main steam turbine low pressure (LP) cylinder, steam discharge level pressure due to feed pump turbine is main steam turbine intermediate pressure cylinder steam discharge, exhaust steam pressure is lower, and the steam from main steam turbine high-pressure cylinder steam discharge is after feed pump turbine acting, and the humidity of steam is still larger, what blade efficiency of end is still lower, and which feed pump turbine whole efficiency is not high.Another mode arranges the main steam turbine bleed steam pipework being communicated with main steam turbine extraction opening and feed pump turbine exhaust steam pipe in systems in which, when feed pump turbine exhaust steam pressure is less than main steam turbine extraction pressure, by main steam turbine filling; When feed pump turbine exhaust steam pressure is greater than main steam turbine extraction pressure, low-pressure heater is removed in the overflow of feed pump turbine steam discharge, because this system feed pump turbine steam discharge directly removes oxygen-eliminating device, main steam turbine draws gas and directly mends oxygen-eliminating device, when filling amount is too large, oxygen-eliminating device superpressure, deaerator storage tank seethe with excitement, and there is the risk of feed water pump cavitation.
Summary of the invention
Based on this, be necessary the defect for prior art, a kind of efficient heat regenerative system and method be provided, effectively can control the exhaust steam pressure of the feed pump turbine of back pressure type, ensure the operational efficiency of feed pump turbine, and there is not the risk to oxygen-eliminating device superpressure and feed water pump cavitation.
Its technological scheme is as follows:
A kind of efficient heat regenerative system, comprise the high-pressure cylinder be communicated with successively, intermediate pressure cylinder and low pressure (LP) cylinder, it also comprises pressure header, the feed pump turbine of back pressure extraction, described intermediate pressure cylinder is provided with at least one extraction opening, described pressure header is provided with at least two steam inlets, one of them extraction opening of described intermediate pressure cylinder is communicated with described one of them steam inlet of pressure header, the steam-expelling port of described feed pump turbine is communicated with described another steam inlet of pressure header, the steam-expelling port of pressure header is communicated with the steam inlet of backheat equipment, extraction opening or another extraction opening of intermediate pressure cylinder of the steam inlet of feed pump turbine and the steam-expelling port of high-pressure cylinder or high-pressure cylinder are communicated with.
Its further technological scheme is as follows:
Described efficient heat regenerative system also comprises the pressure meter for detected pressures header pressure size, the connecting pipeline of the extraction opening of described intermediate pressure cylinder and the steam inlet of described pressure header is provided with the first modulating valve, and the connecting pipeline of the steam-expelling port of described pressure header and the steam inlet of backheat equipment is provided with the second modulating valve.
Described efficient heat regenerative system also comprises controller, and described pressure meter, the first modulating valve and the second modulating valve and described controller are electrically connected.
Described efficient heat regenerative system also comprises feed water pump or boiler fan, and the rotatingshaft of described feed pump turbine is connected with described feed water pump or boiler fan.
Described efficient heat regenerative system also comprises generator, and described generator is connected with described feed water pump or boiler fan.
Described feed pump turbine is provided with at least one extraction opening, at least one extraction opening of feed pump turbine is communicated with the steam inlet of high-pressure heater, when the degree of superheat of drawing gas exceedes amount value, the connecting pipeline of described high-pressure heater and feed pump turbine is provided with externally arranged steam cooler.
Described feed pump turbine is provided with multiple extraction opening, and one of them extraction opening of feed pump turbine is communicated with the steam inlet of oxygen-eliminating device.
Described pressure header is provided with multiple steam-expelling port, and one of them steam-expelling port of pressure header is communicated with the steam inlet of low-pressure heater or oxygen-eliminating device.
Described pressure header is provided with multiple steam-expelling port, and one of them steam-expelling port of pressure header is communicated with the steam inlet of vapour condenser.
At least one extraction opening of described feed pump turbine and/or steam-expelling port are communicated with the steam inlet of industrial heating equipment.
A kind of efficient heat regenerating method, comprises the steps:
The steam discharge of main steam turbine high-pressure cylinder is delivered to the feed pump turbine of back pressure extraction;
The steam discharge of feed pump turbine is delivered to pressure header, and is communicated with described pressure header by the extraction opening of main steam turbine intermediate pressure cylinder, the steam discharge of pressure header is delivered to one or more backheat equipment;
When the pressure of pressure header is lower than rated range, main steam turbine intermediate pressure cylinder draws gas and is supplemented to pressure header; When the pressure of pressure header is higher than rated range, the overflow of pressure header is to described backheat equipment.
Below the advantage of preceding solution or principle are described:
Above-mentioned efficient heat regenerative system, by arranging pressure header, the exhaust steam pressure of the feed pump turbine of back pressure extraction is controlled by draw gas filling and overflow system of its normal steam discharge, intermediate pressure cylinder, in pressure header level pressure, under unit different load, all can effectively control exhaust pressure in reasonable value, feed pump turbine exhaust steam moisture can be ensured, guarantee feed pump turbine Effec-tive Function, exhaust pressure is controlled by pressure header, do not affect the operation of other associated components or backheat equipment, such as can not cause the problem such as oxygen-eliminating device superpressure, feed water pump cavitation.
Above-mentioned efficient heat regenerating method, feed pump turbine admission adopts main steam turbine high-pressure cylinder steam discharge, through further after feed pump turbine acting, the steam discharge of feed pump turbine is delivered to pressure header, when the pressure of pressure header is lower than rated range, main steam turbine intermediate pressure cylinder draws gas and is supplemented to pressure header; When the pressure of pressure header is higher than rated range, the overflow of pressure header is to backheat equipment, thus make the exhaust steam pressure of feed pump turbine under unit different load, all can effectively control within the scope of reasonable value, feed pump turbine exhaust steam moisture can be ensured, guarantee feed pump turbine Effec-tive Function, feed pump turbine steam discharge level pressure realizes in pressure header, and the height of exhaust steam pressure does not affect the safe operation of low-pressure heater, oxygen-eliminating device, feed water pump etc.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the efficient heat regenerative system described in the embodiment of the present invention.
Description of reference numerals:
10, high-pressure cylinder, 20, intermediate pressure cylinder, 30, low pressure (LP) cylinder, 40, pressure header, 41, pressure meter, 50, feed pump turbine, 60, low-pressure heater, 70, high-pressure heater, 80, oxygen-eliminating device, 90, reheater, 100, feed water pump, 110, vapour condenser.
Embodiment
As shown in Figure 1, a kind of efficient heat regenerative system, comprise the high-pressure cylinder 10 be communicated with successively, intermediate pressure cylinder 20 and low pressure (LP) cylinder 30, it also comprises pressure header 40, the feed pump turbine 50 of back pressure extraction, described intermediate pressure cylinder 20 is provided with at least one extraction opening, described pressure header 40 is provided with at least two steam inlets, described one of them extraction opening of intermediate pressure cylinder 20 is communicated with described one of them steam inlet of pressure header 40, the steam-expelling port of described feed pump turbine 50 is communicated with described another steam inlet of pressure header 40, the steam-expelling port of pressure header 40 is communicated with the steam inlet of backheat equipment as low-pressure heater 60 or oxygen-eliminating device 80, the steam inlet of feed pump turbine 50 is communicated with the steam-expelling port of high-pressure cylinder 10, according to the actual requirements, the steam inlet of feed pump turbine 50 can also be communicated with the extraction opening of high-pressure cylinder 10 or another extraction opening of intermediate pressure cylinder 20.Wherein, described high-pressure cylinder 10 is provided with reheater 90 with the connecting pipeline of intermediate pressure cylinder 20, and a part of steam discharge of high-pressure cylinder 10 is directed to reheater 90 and carries out heat temperature raising, and then enters intermediate pressure cylinder 20.
By arranging pressure header 40, the exhaust steam pressure of the feed pump turbine 50 of back pressure extraction is controlled by draw gas filling and overflow system of its normal steam discharge, intermediate pressure cylinder 20, in pressure header 40 level pressure, under unit different load, all can effectively control exhaust pressure in reasonable value, feed pump turbine 50 exhaust steam moisture can be ensured, guarantee feed pump turbine 50 Effec-tive Function, exhaust pressure is controlled by pressure header 40, do not affect the operation of other associated components or backheat equipment, such as can not cause the problems such as oxygen-eliminating device 80 superpressure, feed water pump cavitation.
As shown in Figure 1, described efficient heat regenerative system also comprises pressure meter 41, controller, the connecting pipeline of the extraction opening of described intermediate pressure cylinder 20 and the steam inlet of described pressure header 40 is provided with the first modulating valve, the connecting pipeline of the steam-expelling port of described pressure header 40 and the steam inlet of low-pressure heater 60 is provided with the second modulating valve, and described pressure meter 41, first modulating valve and the second modulating valve and described controller are electrically connected.The pressure size of described pressure meter 41 detected pressures header 40, data are passed to controller, controller controls the first modulating valve, the second modulating valve opening and closing and regulates its openings of sizes, regulate the pressure in pressure header 40, when the pressure of pressure header 40 is lower than rated range, intermediate pressure cylinder 20 draws gas and is supplemented to pressure header 40; When the pressure of pressure header 40 is higher than rated range, pressure header 40 overflow is to described low-pressure heater 60, and exhaust pressure is controlled by pressure header 40 pressure signal, and control signal is clear and definite, and pressure regulates in time flexibly, improves system reliability.The rated pressure scope of pressure header 40 is systemic presuppositions, and when the pressure of pressure header 40 is in rated pressure scope, the exhaust pressure of feed pump turbine 50 is reasonable, and feed pump turbine 50 exhaust steam moisture is little, feed pump turbine 50 Effec-tive Function.
Described efficient heat regenerative system also comprises feed water pump 100 or boiler fan, the rotatingshaft of described feed pump turbine 50 is connected with described feed water pump 100 or boiler fan, feed pump turbine 50 drives feed water pump or boiler fan to run, described efficient heat regenerative system also comprises generator, described generator is connected by coupling with described feed water pump 100 or boiler fan, the more than needed of axle system is exerted oneself for generating, makes full use of system capacity.
As shown in Figure 1, described feed pump turbine 50 is provided with multiple extraction opening, at least one extraction opening of feed pump turbine is communicated with the steam inlet of high-pressure heater 70, according to actual needs, multiple high-pressure heater 70 can be arranged be communicated with respectively with the extraction opening of feed pump turbine, the present embodiment is provided with three high-pressure heaters 70, high-pressure cylinder 10 steam discharge is through further after feed pump turbine 50 does work, take out part vapour and remove high-pressure heater 70 heated feed water, when the degree of superheat of drawing gas exceedes amount value, described high-pressure heater 70 and the connecting pipeline of feed pump turbine 50 are provided with externally arranged steam cooler, for reducing the degree of superheat of drawing gas, because the degree of superheat of drawing gas is low, useful work loss for steam during heated feed water is few, the heat of steam is only utilized to get final product heated feed water to the temperature needed.In Fig. 1, one of them extraction opening of feed pump turbine is communicated with the steam inlet of oxygen-eliminating device 80, and oxygen-eliminating device 80 also can be communicated with one of them steam-expelling port of pressure header 40.According to the actual requirements, at least one extraction opening of described feed pump turbine and/or steam-expelling port are communicated with the steam inlet of industrial heating equipment, for industrial heating.
Described pressure header 40 is provided with multiple steam-expelling port, multiple low-pressure heater 60 can be set, multiple low-pressure heater 60 is communicated with respectively with multiple steam-expelling ports of pressure header 40, the present embodiment is provided with two low-pressure heaters 60, one of them steam-expelling port of pressure header 40 is communicated with the steam inlet of vapour condenser 110, remove vapour condenser 110 during steam discharge accident conditions, the steam-expelling port of described low pressure (LP) cylinder 30 is communicated with described vapour condenser 110.
With reference to Fig. 1, a kind of efficient heat regenerating method, comprises the steps:
The steam discharge of main steam turbine high-pressure cylinder 10 is delivered to the feed pump turbine 50 of back pressure extraction;
The steam discharge of feed pump turbine 50 is delivered to pressure header 40, and is communicated with described pressure header 40 by the extraction opening of main steam turbine intermediate pressure cylinder 20, the steam discharge of pressure header 40 is delivered to one or more backheat equipment;
When the pressure of pressure header 40 is lower than rated range, main steam turbine intermediate pressure cylinder 20 draws gas and is supplemented to pressure header 40; When the pressure of pressure header 40 is higher than rated range, pressure header 40 overflow is to described backheat equipment.
Described backheat equipment can be low-pressure heater 60 or oxygen-eliminating device 80, feed pump turbine 50 admission adopts main steam turbine high-pressure cylinder 10 steam discharge, through further after feed pump turbine 50 does work, the steam discharge of feed pump turbine 50 is delivered to pressure header 40, when the pressure of pressure header 40 is lower than rated range, main steam turbine intermediate pressure cylinder 20 draws gas and is supplemented to pressure header 40; When the pressure of pressure header 40 is higher than rated range, pressure header 40 overflow is to low-pressure heater 60, thus make the exhaust steam pressure of feed pump turbine 50 under unit different load, all can effectively control within the scope of reasonable value, feed pump turbine 50 exhaust steam moisture can be ensured, guarantee feed pump turbine 50 Effec-tive Function, feed pump turbine 50 steam discharge level pressure realizes in pressure header 40, and the height of exhaust steam pressure does not affect the safe operation of low-pressure heater 60, oxygen-eliminating device 80, feed water pump etc.
Each technical characteristics of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristics in above-described embodiment is not all described, but, as long as the combination of these technical characteristicss does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several mode of execution of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (11)
1. an efficient heat regenerative system, comprise the high-pressure cylinder be communicated with successively, intermediate pressure cylinder and low pressure (LP) cylinder, it is characterized in that, it also comprises pressure header, the feed pump turbine of back pressure extraction, described intermediate pressure cylinder is provided with at least one extraction opening, described pressure header is provided with at least two steam inlets, one of them extraction opening of described intermediate pressure cylinder is communicated with described one of them steam inlet of pressure header, the steam-expelling port of described feed pump turbine is communicated with described another steam inlet of pressure header, the steam-expelling port of pressure header is communicated with the steam inlet of backheat equipment, extraction opening or another extraction opening of intermediate pressure cylinder of the steam inlet of feed pump turbine and the steam-expelling port of high-pressure cylinder or high-pressure cylinder are communicated with.
2. efficient heat regenerative system as claimed in claim 1, it is characterized in that, it also comprises the pressure meter for detected pressures header pressure size, the connecting pipeline of the extraction opening of described intermediate pressure cylinder and the steam inlet of described pressure header is provided with the first modulating valve, and the connecting pipeline of the steam-expelling port of described pressure header and the steam inlet of backheat equipment is provided with the second modulating valve.
3. efficient heat regenerative system as claimed in claim 2, it is characterized in that, it also comprises controller, and described pressure meter, the first modulating valve and the second modulating valve and described controller are electrically connected.
4. efficient heat regenerative system as claimed in claim 1, it is characterized in that, it also comprises feed water pump or boiler fan, and the rotatingshaft of described feed pump turbine is connected with described feed water pump or boiler fan.
5. efficient heat regenerative system as claimed in claim 4, it is characterized in that, it also comprises generator, and described generator is connected with described feed water pump or boiler fan.
6. efficient heat regenerative system as claimed in claim 1, it is characterized in that, described feed pump turbine is provided with at least one extraction opening, at least one extraction opening of feed pump turbine is communicated with the steam inlet of high-pressure heater, when the degree of superheat of drawing gas exceedes amount value, the connecting pipeline of described high-pressure heater and feed pump turbine is provided with externally arranged steam cooler.
7. efficient heat regenerative system as claimed in claim 6, it is characterized in that, described feed pump turbine is provided with multiple extraction opening, and one of them extraction opening of feed pump turbine is communicated with the steam inlet of oxygen-eliminating device.
8. efficient heat regenerative system as claimed in claim 6, it is characterized in that, described pressure header is provided with multiple steam-expelling port, and one of them steam-expelling port of pressure header is communicated with the steam inlet of low-pressure heater or oxygen-eliminating device.
9. the efficient heat regenerative system as described in any one of claim 1 to 8, is characterized in that, described pressure header is provided with multiple steam-expelling port, and one of them steam-expelling port of pressure header is communicated with the steam inlet of vapour condenser.
10. the efficient heat regenerative system as described in any one of claim 1 to 8, is characterized in that, at least one extraction opening of described feed pump turbine and/or steam-expelling port are communicated with the steam inlet of industrial heating equipment.
11. 1 kinds of efficient heat regenerating methods, is characterized in that, comprise the steps:
The steam discharge of main steam turbine high-pressure cylinder is delivered to the feed pump turbine of back pressure extraction;
The steam discharge of feed pump turbine is delivered to pressure header, and is communicated with described pressure header by the extraction opening of main steam turbine intermediate pressure cylinder, the steam discharge of pressure header is delivered to one or more backheat equipment;
When the pressure of pressure header is lower than rated range, main steam turbine intermediate pressure cylinder draws gas and is supplemented to pressure header; When the pressure of pressure header is higher than rated range, the overflow of pressure header is to described backheat equipment.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108843412A (en) * | 2018-06-29 | 2018-11-20 | 东方电气集团东方汽轮机有限公司 | A kind of Steam Turbine Regenerative System |
| CN110242371A (en) * | 2019-05-30 | 2019-09-17 | 中国船舶重工集团公司第七一九研究所 | Back pressure turbine steam exhaust system and its steam exhaust utilize method |
| CN110905616A (en) * | 2019-11-06 | 2020-03-24 | 大唐郓城发电有限公司 | Backpressure adjusting system and method for steam extraction backpressure type water supply pump steam turbine |
| CN114592928A (en) * | 2022-03-30 | 2022-06-07 | 西安热工研究院有限公司 | BEST small-machine steam inlet and outlet system and steam outlet pressure control operation method thereof |
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| CN110905616A (en) * | 2019-11-06 | 2020-03-24 | 大唐郓城发电有限公司 | Backpressure adjusting system and method for steam extraction backpressure type water supply pump steam turbine |
| CN114592928A (en) * | 2022-03-30 | 2022-06-07 | 西安热工研究院有限公司 | BEST small-machine steam inlet and outlet system and steam outlet pressure control operation method thereof |
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