CN103016083B - Back pressure pure condensate switches heating system - Google Patents
Back pressure pure condensate switches heating system Download PDFInfo
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- CN103016083B CN103016083B CN201210576731.1A CN201210576731A CN103016083B CN 103016083 B CN103016083 B CN 103016083B CN 201210576731 A CN201210576731 A CN 201210576731A CN 103016083 B CN103016083 B CN 103016083B
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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 invention provides a kind of back pressure pure condensate and switch heating system, comprise the high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and the vapour condenser that are communicated with in turn, also comprise bleed steam pipework and heat exchangers for district heating, described bleed steam pipework is communicated with intermediate pressure cylinder and heat exchangers for district heating respectively; It is characterized in that Heating Period, the rotor in described low pressure (LP) cylinder is set to back pressure rotor, and described back pressure rotor is the optical axis not with impeller, at non-heating period, still adopts the low pressure rotor pure condensate with impeller to run; Compared with traditional heating system, back pressure pure condensate switched system provided by the invention, at Heating Period, not only considerably increase the heating load of unit, and achieve whole utilizations of intermediate pressure cylinder exhaust steam heat, and effectively prevent the problems such as steam negative acting, the steam cold source energy caused because passing into steam flow decline in low pressure (LP) cylinder at Heating Period.
Description
Technical field
The present invention relates to power station energy-saving heating system, particularly relates to a kind of back pressure pure condensate and switches heating system.
Background technique
Due to the current coal that coal price market is surging, electricity price is low electricity inversion phenomenon, the management position of thermal power plant's ubiquity generating loss.From the production technology of thermoelectricity plant, tradition supplies thermal recovery intermediate pressure cylinder steam discharge as resident's heating vapour source, analyze by electric heating transfer process, the heat supply of intermediate pressure cylinder steam discharge only needs the steam available energy of consumption about 40%, the average unit of heat consumption mark coal amount that supplies is only 16.8kg/GJ, and arcola marks coal amount generally at 42kg/GJ for unit of heat consumption.Therefore power plant actively expands heat supply market, increases heating load, is to realize power plant to make up deficits the effective way of synergy, energy-conservationly to say entire society, has huge energy-saving effect.
And the heat-supplying mode of routine as shown in Figure 1, using intermediate pressure cylinder steam discharge as supplying hot vapour source, one, owing to being subject to the quantitative limitation of low pressure (LP) cylinder lowest current, intermediate pressure cylinder steam discharge has significant proportion to have to pass into in low pressure (LP) cylinder, and the remaining steam flow that can be used for heat of intermediate pressure cylinder is limited, makes huge heat supply income to obtain; Two, when low pressure (LP) cylinder flow declines more, especially time lower than lowest current amount, steam does not do work in low pressure (LP) cylinder, even negative acting, low pressure (LP) cylinder exhaust enthalpy significantly improves, and low pressure (LP) cylinder transforms the decrease in efficiency of mechanical energy, and the ratio that steam is converted to electric energy at low pressure (LP) cylinder declines, the steam heat entering low pressure (LP) cylinder has more than 80% to be drained into vapour condenser, causes cold source energy.Therefore, traditional heating mode not only limit unit heating load, and there is larger heat-energy losses.
Summary of the invention
(1) technical problem that will solve
The object of the invention is to lose serious defect to solve the restriction of conventional heating system low pressure (LP) cylinder lowest current amount heating load, cold energy, providing a kind of back pressure pure condensate and switching heating system.
(2) technological scheme
For solving the problems of the technologies described above, the invention provides a kind of back pressure pure condensate and switch heating system, comprise the high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and the vapour condenser that are communicated with in turn, also comprise bleed steam pipework and heat exchangers for district heating, described bleed steam pipework is communicated with intermediate pressure cylinder and heat exchangers for district heating respectively; At Heating Period, the rotor in described low pressure (LP) cylinder is set to back pressure rotor, and described back pressure rotor is the optical axis not with impeller.
Preferably, described bleed steam pipework is provided with the first valve.
Preferably, the connecting pipeline of described intermediate pressure cylinder and low pressure (LP) cylinder is provided with the second valve.
Preferably, the connecting pipeline of described intermediate pressure cylinder and low pressure (LP) cylinder is also provided with desuperheater.
Preferably, also comprise controller, described controller connects the first valve, the second valve and desuperheater respectively.
(3) beneficial effect
Back pressure pure condensate of the present invention switches heating system, at the back pressure rotor that Heating Period switches to optical axis to dally, there is no the lowest current amount requirement of wheel rotation, achieve whole utilizations of intermediate pressure cylinder exhaust steam heat, according to statistics, this system considerably increases the heating load of unit heating phase, through test, heating load improves about 28%, and effectively prevent the problems such as steam negative acting, the steam thermal energy waste caused because passing into steam flow decline in low pressure (LP) cylinder at Heating Period; Further, back pressure pure condensate of the present invention switches heating system, by set desuperheater, after about a small amount of steam cooling to 60 DEG C, send into low pressure (LP) cylinder, lower the temperature for the rotor dallied to optical axis, prevent axis friction heat-dissipating and the problem such as to deform.
Accompanying drawing explanation
The heating system structure schematic diagram that Tu1Shi power plant is traditional;
Fig. 2 is the example structure schematic diagram of non-heating period of the present invention;
Fig. 3 is the example structure schematic diagram of Heating Period of the present invention;
Wherein: 100, high-pressure cylinder, 200, intermediate pressure cylinder, 300, low pressure (LP) cylinder, 310, pure condensate rotor, 311, rotating shaft, 312, impeller, 320, back pressure rotor, 330, the first coupling, the 340, second coupling, the 350, second valve, 360, desuperheater, 400, vapour condenser, 500, generator, 600, bleed steam pipework, the 610, first valve, 700, heat exchangers for district heating, 710, return pipe, 720, outlet pipe, 800, controller.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but not limit the scope of the invention.
Traditional heating mode is mainly reformed by the present invention, pure condensate rotor is set to the back pressure rotor that the optical axis not with impeller dallies, to give full play to the efficient heat supply advantage of back pressure rotor at Heating Period, and at non-heating period, then still adopt traditional pure condensate rotor, do not needing, under the prerequisite of warming oneself, heat energy to be used for as much as possible generating, and then, by the switching of back pressure pure condensate, improve energy-saving effect, simultaneously, the present invention has also carried out a series of improvement to system, to make energy-saving effect better.As Fig. 2,3 respectively illustrates the embodiment of non-heating period and Heating Period.
Non-heating period as shown in Figure 2, back pressure pure condensate switches heating system and comprises the high-pressure cylinder 100, intermediate pressure cylinder 200, low pressure (LP) cylinder 300 and the vapour condenser 400 that are communicated with in turn, rotor in intermediate pressure cylinder 200 is connected by the first coupling 330 with the rotor in low pressure (LP) cylinder 300, rotor in low pressure (LP) cylinder 300 connects the rotor of generator 500 by the second coupling 340, namely the first coupling 330 and the second coupling 340 are arranged on the two end part of rotating shaft 311 respectively, and the first coupling 330 and the second coupling 340 adopt wheeled construction, respectively so that the unmount operations of rotor; Rotor wherein in low pressure (LP) cylinder 300 is set to traditional pure condensate rotor 310, i.e. the rotating shaft 311 of pure condensate rotor 310 is provided with impeller 312, and rotating shaft 311 is together with impeller 312 synchronous axial system; In this stage, the steam in intermediate pressure cylinder 200 all passes in low pressure (LP) cylinder 300, rotates by ordering about impeller 312, and improving thermal energy is further the efficiency of mechanical energy, to improve generated energy.
Native system also comprises bleed steam pipework 600, heat exchangers for district heating 700 and controller 800 etc., bleed steam pipework 600 is communicated with intermediate pressure cylinder 200 and heat exchangers for district heating 700 respectively, heat exchangers for district heating 700 is provided with the return pipe 710 for connecting pumps for hot water supply net, with the outlet pipe 720 for being connected heat supply network user side; Bleed steam pipework 600 is provided with the first valve 610, the connecting pipeline of intermediate pressure cylinder 200 and low pressure (LP) cylinder 300 is provided with the second valve 350, controller 800 connects respectively and controls the first valve 610 and the second valve 350, certainly, for cost-saving, according to specific design requirement, also can not mount controller 800, the switch motion for the first valve 610 and the second valve 350 adopts manually-operable; Non-heating period shown in Fig. 2, adopt manually-operable or manipulated by controller 800, close the first valve 610, open the second valve 350, to ensure that the steam from intermediate pressure cylinder 200 all passes into in low pressure (LP) cylinder 300, to obtain the generating of more mechanical energy, farthest improve generating efficiency.
At Heating Period, even if reduce low pressure (LP) cylinder lowest current amount by reducing rotor blade progression, the object most steam being used for heat supply still cannot be reached, as long as there is blade, for avoiding not doing work or negative acting, a certain amount of steam must be passed into for overcoming mechanical energy and doing positive work.For solving this problem, scheme of the present invention is for shown in Fig. 3, pure condensate rotor in low pressure (LP) cylinder 300 is taken out, namely by rotating shaft 311 removal pure condensate rotor, be replaced by back pressure rotor 320, this back pressure rotor 320 is the idle running optical axis not with impeller, and opens the first valve 610, adjusts the opening degree of the second valve 350; Simultaneously, back pressure rotor 320 i.e. optical axis is when rotating, cause this axle that distortion to a certain degree occurs for avoiding temperature too high, and then cause the problems such as equipment cannot run well, the connecting pipeline of intermediate pressure cylinder 200 and low pressure (LP) cylinder 300 is provided with desuperheater 360, a small amount of steam (being generally set to 5 ~ 8t/h) can be cooled to after about 60 DEG C by this desuperheater, deliver to countershaft in low pressure (LP) cylinder and cool, solved the rotating shaft problem on deformation after being replaced by back pressure rotor.
In the Heating Period state shown in Fig. 3, because of in low pressure (LP) cylinder without mechanisms such as impellers, and then do not need to consider that steam flow does not do work to rotor the problem of even negative acting, namely without the requirement of the lowest current amount for low pressure (LP) cylinder, the steam that intermediate pressure cylinder is gone out is all for heat supply, through test, the heat supply amount of drawing gas of this system can improve about 28%, and corresponding heating load also improves about 28%; Separately, this system efficiently solves the problems such as the energy loss caused because the steam flow passed in low pressure (LP) cylinder reduces (as stated in the Background Art, this part has more than 80% directly send into vapour condenser and cause heat not to be used, and then causes cold source energy).
As shown in the table, after transforming certain 200MW tradition thermal power plant unit, after transforming back pressure pure condensate heating system of the present invention as by it, effect is as follows:
| Title | Unit | Before transformation | After transformation |
| Heat supply vapour amount | t/h | 300 | 420 |
| For thermal pressure | MPa | 0.2 | 0.2 |
| Heat supply temperature | ℃ | 245 | 245 |
| Heat supply phase gross coal consumption rate | g/kWh | 260 | 160 |
Known by above data, same heating parameter, relatively before transformation, improved heating load adds 120t/h, and improved heat supply phase gross coal consumption rate have dropped 100g/kWh, and heating efficiency significantly improves, and energy-saving effect is remarkable.
Finally it should be noted that, above embodiment is only in order to illustrate technological scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those skilled in the art are to be understood that, can modify to technological scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. a back pressure pure condensate switches heating system, comprise the high-pressure cylinder (100), intermediate pressure cylinder (200), low pressure (LP) cylinder (300) and the vapour condenser (400) that are communicated with in turn, also comprise bleed steam pipework (600) and heat exchangers for district heating (700), described bleed steam pipework (600) is communicated with intermediate pressure cylinder (200) and heat exchangers for district heating (700) respectively; It is characterized in that:
At Heating Period, the rotor in described low pressure (LP) cylinder (300) is set to back pressure rotor (320), and described back pressure rotor (320) is the optical axis not with impeller.
2. back pressure pure condensate according to claim 1 switches heating system, it is characterized in that: described bleed steam pipework (600) is provided with the first valve (610).
3. back pressure pure condensate according to claim 2 switches heating system, it is characterized in that: the connecting pipeline of described intermediate pressure cylinder (200) and low pressure (LP) cylinder (300) is provided with the second valve (350).
4. back pressure pure condensate according to claim 3 switches heating system, it is characterized in that: the connecting pipeline of described intermediate pressure cylinder (200) and low pressure (LP) cylinder (300) is also provided with desuperheater (360).
5. back pressure pure condensate according to claim 4 switches heating system, it is characterized in that: also comprise controller (800), described controller (800) connects the first valve (610), the second valve (350) and desuperheater (360) respectively.
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| CN201210576731.1A CN103016083B (en) | 2012-12-26 | 2012-12-26 | Back pressure pure condensate switches heating system |
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| CN201210576731.1A CN103016083B (en) | 2012-12-26 | 2012-12-26 | Back pressure pure condensate switches heating system |
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| CN103016083B true CN103016083B (en) | 2015-11-18 |
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| CN109654580A (en) * | 2019-01-29 | 2019-04-19 | 北京国电蓝天节能科技开发有限公司 | Heating system based on low pressure (LP) cylinder optical axis |
| CN110553301B (en) * | 2019-09-25 | 2021-09-28 | 国电龙源节能技术有限公司 | Heat supply method and system for air cooling unit |
| CN110553300B (en) * | 2019-09-25 | 2021-05-28 | 国电龙源节能技术有限公司 | Heating system and method for wet cooling unit |
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Inventor after: Xu Zelin Inventor after: Zhang Pan Inventor after: Li Wenjiang Inventor after: Zhang He Inventor after: Xu Lei Inventor after: Bai Xudong Inventor before: Xu Zelin Inventor before: Zhang Pan Inventor before: Li Wenjiang Inventor before: Zhang He |
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Effective date of registration: 20201216 Address after: 16F, building 1, No. 16 yard, West Fourth Ring Road middle, Haidian District, Beijing 100089 Patentee after: GUODIAN LONGYUAN ENERGY SAVING TECHNOLOGY Co.,Ltd. Address before: Room 1802, Fuhai international port, Daliushu Road, Haidian District, Beijing 100081 Patentee before: BEIJING GUODIAN BLUE SKY ENERGY SAVING TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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Address after: 102200 room 5413, building 305, Guodian New Energy Technology Research Institute, future science city, Beiqijia Town, Changping District, Beijing Patentee after: Guoneng Longyuan Lantian Energy Saving Technology Co.,Ltd. Address before: 16F, building 1, No. 16 yard, West Fourth Ring Road middle, Haidian District, Beijing 100089 Patentee before: GUODIAN LONGYUAN ENERGY SAVING TECHNOLOGY Co.,Ltd. |