CN108469017A - A kind of pair is dragged electric pump back pressure turbine comprehensive utilization device and its method - Google Patents
A kind of pair is dragged electric pump back pressure turbine comprehensive utilization device and its method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 125
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 29
- 230000023556 desulfurization Effects 0.000 claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 62
- 239000003546 flue gas Substances 0.000 claims description 62
- 239000007789 gas Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000010248 power generation Methods 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000010612 desalination reaction Methods 0.000 claims 7
- 230000003009 desulfurizing effect Effects 0.000 claims 4
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- 230000001105 regulatory effect Effects 0.000 abstract description 28
- 230000007797 corrosion Effects 0.000 abstract description 16
- 238000005260 corrosion Methods 0.000 abstract description 16
- 230000006698 induction Effects 0.000 abstract 1
- 230000000903 blocking effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010793 Steam injection (oil industry) Methods 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
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- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
本发明公开了一种双拖电泵背压汽轮机综合利用装置，包括给水泵、背压汽轮机、调速齿轮箱、发电机、暖空器、送风机、空预器、锅炉、布袋除尘器、引风机、低低温省煤器、除氧器、脱硫塔、烟囱。本发明还公开了该装置综合利用的方法。本发明结构合理，利用背压汽轮机排汽作为暖空器气源，解决了锅炉空预器低温腐蚀堵灰的问题，而低低温省煤器的使用又解决了暖空带来的排烟温度高的问题，暖空器疏水又通过低低温省煤器再次进入锅炉系统，大大提高了机组热效率以及资源利用率。
The invention discloses a comprehensive utilization device for a back pressure steam turbine with double drag electric pumps, which comprises a feed water pump, a back pressure steam turbine, a speed regulating gear box, a generator, an air heater, a blower fan, an air preheater, a boiler, a bag filter, an induction Fans, low and low temperature economizers, deaerators, desulfurization towers, chimneys. The invention also discloses a method for comprehensive utilization of the device. The invention has a reasonable structure, uses the exhaust steam of the back pressure steam turbine as the air source of the air heater, solves the problem of low-temperature corrosion and clogging of the boiler air preheater, and uses the low-low temperature economizer to solve the exhaust gas temperature caused by the warm air For the problem of high temperature, the water from the air heater re-enters the boiler system through the low and low temperature economizer, which greatly improves the thermal efficiency of the unit and the utilization rate of resources.
Description
技术领域technical field
本发明涉及热电联产机组高效能源利用、节能减排技术领域，具体涉及一种双拖电泵背压汽轮机综合利用装置及其方法。The invention relates to the technical field of high-efficiency energy utilization, energy saving and emission reduction of heat and power cogeneration units, in particular to a comprehensive utilization device and method for a back pressure steam turbine with double drag electric pumps.
背景技术Background technique
燃煤火电厂是我国电力生产的主要企业，全国用电量中有78％电量来自燃煤火电厂。我国能源消耗以煤炭为主，每年要开采近20亿吨标准煤的一次能源，折合人民币大约1万亿元的工业产值，其中将近一半被火电厂锅炉烧掉了。因此，现阶段燃煤电厂全面倡导节能改造，大幅降低发电煤耗和提高能源利用率，节能减排，以此达到电力行业清洁化、高效化发展。Coal-fired thermal power plants are the main enterprises in my country's electricity production, and 78% of the national electricity consumption comes from coal-fired thermal power plants. my country's energy consumption is dominated by coal, and nearly 2 billion tons of standard coal are mined for primary energy every year, which is equivalent to an industrial output value of about 1 trillion yuan, and nearly half of it is burned by thermal power plant boilers. Therefore, at this stage, coal-fired power plants comprehensively advocate energy-saving transformation, greatly reduce coal consumption for power generation, improve energy utilization, save energy and reduce emissions, so as to achieve clean and efficient development of the power industry.
目前，发电厂供水循环会用到给水泵，目前电厂普遍使用汽轮机驱动给水泵，即汽轮机的轴的一端带动给水泵，主要解决的是给水泵费电的问题。相对经济性能来说，更多选择了背压汽轮机作为给水泵驱动汽轮机。但为了满足机组夏季长周期满负荷运行，背压汽轮机的额定出力通常比给水泵的额定出力大，故汽轮机的额定出力有较大裕量，一般为20％以上。另外，在电站中，汽轮机的乏汽温度较高，一般接入凝汽器，但给水泵汽轮机乏汽压力一般高于凝汽器压力，实际运行时，受给水泵汽轮机设计制造和安装工艺水平限制，特别是给水泵运行性能较差时，这一差值更大，一方面造成给水泵汽轮机乏汽余热的白白浪费，另一方面也使凝汽器热负荷偏高，影响机组真空，机组供电煤耗增加。这部分负荷裕量和乏汽余热如不能充分利用，会导致设备及能源利用率低，经济效益差。因此，如何回收再利用这部分负荷裕量和乏汽余热，是本领域技术人员需要迫切解决的问题。At present, feed water pumps are used in the water supply cycle of power plants. At present, power plants generally use steam turbines to drive feed water pumps, that is, one end of the shaft of the steam turbine drives the feed water pumps. The main solution is the problem of power consumption of the feed water pumps. Relative to the economic performance, the back pressure steam turbine is more chosen as the feed water pump to drive the steam turbine. However, in order to meet the long-term full-load operation of the unit in summer, the rated output of the back pressure steam turbine is usually larger than the rated output of the feed water pump, so the rated output of the steam turbine has a large margin, generally more than 20%. In addition, in the power station, the exhaust steam temperature of the steam turbine is relatively high, and it is generally connected to the condenser, but the exhaust steam pressure of the feedwater pump turbine is generally higher than the condenser pressure. In actual operation, it is affected by the design, manufacture and installation process level of the feedwater pump turbine. Especially when the operation performance of the feedwater pump is poor, the difference is even greater. On the one hand, it causes waste of exhaust heat of the steam turbine in the feedwater pump, and on the other hand, it also makes the heat load of the condenser higher, affecting the vacuum of the unit. Increased coal consumption for power supply. If this part of the load margin and the waste heat of exhausted steam cannot be fully utilized, it will lead to low utilization rate of equipment and energy, and poor economic benefits. Therefore, how to recover and reuse this part of the load margin and exhaust heat is an urgent problem to be solved by those skilled in the art.
如中国专利授权公告号CN204002945U公开一种给水泵小汽轮机同轴驱动发电装置。所述装置包括：给水泵，小汽轮机，恒定转速输出齿轮箱和发电机；所述给水泵和所述小汽轮机相连接；所述恒定转速输出齿轮箱的输入端和所述小汽轮机相连接；所述发电机连接所述恒定转速输出齿轮箱的输出端。该给水泵小汽轮机同轴驱动发电装置，能够实现对所述小汽轮机额外余量(负荷)的有效利用，能够有效避免在小汽轮机驱动给水泵的过程中造成的负荷浪费的问题。不足之处是汽轮机的乏汽余热没有得到有效利用。Disclose a kind of feedwater pump small steam turbine coaxially driven power generation device as Chinese patent authorization announcement number CN204002945U. The device includes: a feedwater pump, a small steam turbine, a constant speed output gearbox and a generator; the feedwater pump is connected to the small steam turbine; the input end of the constant speed output gearbox is connected to the small steam turbine; The generator is connected to the output end of the constant speed output gearbox. The power generation device coaxially driven by the small steam turbine of the feedwater pump can realize the effective utilization of the extra margin (load) of the small steam turbine, and can effectively avoid the problem of load waste caused in the process of driving the feedwater pump by the small steam turbine. The disadvantage is that the exhaust heat of the steam turbine has not been effectively utilized.
又如中国专利授权公告号CN206160094U公开了一种给水泵汽轮机乏汽余热利用系统，包括蒸汽喷射压缩器、中压缸、低压加热器以及前置式热网加热器，所述蒸汽喷射压缩器的第一入口与给水泵汽轮机相连，所述蒸汽喷射压缩器的第二入口与所述中压缸的排汽端相连，所述中压缸的另一排汽端与热网加热器壳侧相连，所述蒸汽喷射压缩器的出口与前置式热网加热器的壳侧相连，所述蒸汽喷射压缩器的出口还与低压加热器相连，所述蒸汽喷射压缩器利用中压缸的部分排汽抽汽作为驱动汽源，抽吸给水泵汽轮机的乏汽，将温度、压力相对较高的中压缸排汽与温度、压力相对较低的给水泵汽轮机乏汽进行温度、压力匹配，并将匹配后的蒸汽供低压加热器与前置式热网加热器使用。不足之处是乏汽余热利用率不高，汽轮机的负荷裕量没有得到有效利用。Another example is the Chinese patent authorization announcement number CN206160094U, which discloses a system for utilizing waste steam and waste heat of a feedwater pump steam turbine, including a steam injection compressor, a medium-pressure cylinder, a low-pressure heater, and a front-mounted heat network heater. The first inlet is connected to the steam turbine of the feed water pump, the second inlet of the steam injection compressor is connected to the exhaust end of the intermediate pressure cylinder, and the other exhaust end of the intermediate pressure cylinder is connected to the shell side of the heat network heater , the outlet of the steam injection compressor is connected with the shell side of the preheating network heater, the outlet of the steam injection compressor is also connected with the low-pressure heater, and the steam injection compressor uses part of the discharge of the medium pressure cylinder Steam extraction is used as the driving steam source to suck the exhaust steam of the feedwater pump turbine, and match the temperature and pressure of the exhaust steam of the medium-pressure cylinder with relatively high temperature and pressure with the exhaust steam of the feedwater pump turbine with relatively low temperature and pressure, and The matched steam is used for the low pressure heater and the front heating network heater. The disadvantage is that the utilization rate of exhaust steam waste heat is not high, and the load margin of the steam turbine has not been effectively utilized.
另外，锅炉空气预热器利用锅炉的排烟余热预热进入炉内的助燃空气，不仅能够提高锅炉的热效率，还能减轻对环境的污染。燃料中的硫分燃烧后生成SO2和SO3，并与烟气中的蒸汽相互作用，生成硫酸蒸汽。当锅炉尾部受热面壁温低于烟气酸露点时,便结露凝聚于该壁面上，由于液态硫酸腐蚀性强，造成低温受热面的金属腐蚀，常称为锅炉低温受热面的腐蚀。锅炉沿烟气流向的末级空气预热器最容易遭受低温腐蚀。在低温腐蚀出现的同时，伴随而来的就是空气预热器的积灰，它们相互促进，形成恶性循环，破坏锅炉的正常运行。锅炉尾部受热面的低温腐蚀对电站锅炉经济性和正常工作影响很大，必须采取措施防止低温腐蚀和积灰。常用的办法是增设暖空器，采用蒸汽进行加热，不足之处是浪费大量资源，增加了能耗。In addition, the boiler air preheater preheats the combustion-supporting air entering the furnace by using the exhaust heat of the boiler, which can not only improve the thermal efficiency of the boiler, but also reduce the pollution to the environment. The sulfur in the fuel is combusted to generate SO 2 and SO 3 , which interact with the steam in the flue gas to generate sulfuric acid vapor. When the wall temperature of the heating surface at the tail of the boiler is lower than the acid dew point of the flue gas, condensation will condense on the wall surface. Due to the strong corrosion of liquid sulfuric acid, the metal corrosion of the low temperature heating surface is caused, which is often called the corrosion of the low temperature heating surface of the boiler. The final air preheater along the flue gas flow direction of the boiler is most susceptible to low temperature corrosion. When low-temperature corrosion occurs, it is accompanied by dust accumulation in the air preheater, and they promote each other to form a vicious circle and destroy the normal operation of the boiler. The low-temperature corrosion of the heating surface at the tail of the boiler has a great impact on the economy and normal operation of the power plant boiler, and measures must be taken to prevent low-temperature corrosion and dust accumulation. The commonly used method is to add an air heater and use steam for heating. The disadvantage is that a lot of resources are wasted and energy consumption is increased.
发明内容Contents of the invention
本发明的目的是克服现有技术的不足，提供一种结构合理，能源利用率高，安全环保的双拖电泵背压汽轮机综合利用装置及其方法。The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a comprehensive utilization device and method for a dual electric pump back pressure steam turbine with reasonable structure, high energy utilization rate, safety and environmental protection.
为实现上述目的，本发明采用的技术方案是：一种双拖电泵背压汽轮机综合利用装置，包括给水泵、背压汽轮机、调速齿轮箱、发电机、暖空器、送风机、空预器、锅炉、布袋除尘器、引风机、低低温省煤器、除氧器、脱硫塔、烟囱，所述背压汽轮机的第一输出轴与所述给水泵的输入轴相连，所述背压汽轮机的第二输出轴与所述调速齿轮箱的输入轴相连，所述调速齿轮箱的输出轴与所述发电机的输入轴相连，所述背压汽轮机的排汽口与所述暖空器的蒸汽进口相连，所述暖空器的出水口与所述低低温省煤器的除盐水进口相连，所述低低温省煤器的除盐水出口与所述除氧器的除盐水进口连接，所述除氧器的除盐水出口与所述给水泵的除盐水进口相连，所述给水泵的除盐水出口与所述锅炉的除盐水进口连接，所述送风机的出风口与所述暖空器的进风口相连，所述暖空器的出风口与所述空预器的进风口相连，所述空预器的出风口与所述锅炉的进风口相连，所述锅炉的出口烟道与所述空预器的烟气进口连接，所述空预器的烟气出口与所述布袋除尘器的烟气进口相连，所述布袋除尘器的烟气出口与所述引风机的进口相连，所述引风机的出口与所述低低温省煤器的烟气进口相连，所述低低温省煤器的烟气出口与所述脱硫塔的进口相连，所述脱硫塔的出口与所述烟囱的进口连接。In order to achieve the above object, the technical solution adopted by the present invention is: a comprehensive utilization device of a double drag electric pump back pressure steam turbine, including a feed water pump, a back pressure steam turbine, a speed regulating gearbox, a generator, an air heater, a blower, an air conditioning device, boiler, bag filter, induced draft fan, low and low temperature economizer, deaerator, desulfurization tower, chimney, the first output shaft of the back pressure steam turbine is connected with the input shaft of the feed water pump, and the back pressure The second output shaft of the steam turbine is connected with the input shaft of the speed regulating gearbox, the output shaft of the speed regulating gearbox is connected with the input shaft of the generator, and the exhaust port of the back pressure steam turbine is connected with the heating The steam inlet of the air heater is connected, the water outlet of the air heater is connected with the desalted water inlet of the low and low temperature economizer, the desalted water outlet of the low and low temperature economizer is connected with the desalted water inlet of the deaerator The desalted water outlet of the deaerator is connected with the desalted water inlet of the feed water pump, the desalted water outlet of the feed water pump is connected with the desalted water inlet of the boiler, and the air outlet of the blower is connected with the desalted water inlet of the boiler. The air inlet of the air heater is connected, the air outlet of the air heater is connected with the air inlet of the air preheater, the air outlet of the air preheater is connected with the air inlet of the boiler, and the outlet flue of the boiler It is connected with the flue gas inlet of the air preheater, the flue gas outlet of the air preheater is connected with the flue gas inlet of the bag filter, and the flue gas outlet of the bag filter is connected with the inlet of the induced draft fan , the outlet of the induced draft fan is connected to the flue gas inlet of the low-low temperature economizer, the flue gas outlet of the low-low temperature economizer is connected to the inlet of the desulfurization tower, and the outlet of the desulfurization tower is connected to the Inlet connection to the chimney.
作为本发明的优选实施方式，所述背压汽轮机还设置有蒸汽进口管，所述蒸汽进口管上设置有进汽调节阀，以精确控制蒸汽流量。As a preferred embodiment of the present invention, the back pressure steam turbine is further provided with a steam inlet pipe, and the steam inlet pipe is provided with a steam inlet regulating valve to precisely control the steam flow.
作为本发明的优选实施方式，所述低低温省煤器优选包括至少一组U型换热管。As a preferred embodiment of the present invention, the low-low temperature economizer preferably includes at least one set of U-shaped heat exchange tubes.
为了减少了低温腐蚀以及设备磨损，提高了设备安全性，作为本发明的优选实施方式，所述的U型换热管材质优选为PTFE。In order to reduce low-temperature corrosion and equipment wear and improve equipment safety, as a preferred embodiment of the present invention, the material of the U-shaped heat exchange tube is preferably PTFE.
为了减少暖风系统检修时对锅炉烟气流动的阻力，进一步提高节能降耗效果，作为本发明的优选实施方式，所述暖空器优选为可抽式暖空器。In order to reduce the resistance to boiler flue gas flow during maintenance of the heating system and further improve the effect of energy saving and consumption reduction, as a preferred embodiment of the present invention, the air heater is preferably a pumpable air heater.
本发明还提供上述双拖电泵背压汽轮机装置综合利用的方法，从主汽轮机排出的低压蒸汽通过进汽调节阀调节流量后进入背压汽轮机做功，背压汽轮机一边驱动给水泵，同时通过调速齿轮箱带动发电机发电，从背压汽轮机排出的乏汽进入暖空器，与从送风机来的冷空气换热后凝结成除盐水进入低低温省煤器，在低低温省煤器中与从引风机来的热烟气换热升温后进入除氧器除氧，除氧后的除盐水经给水泵加压后进入锅炉的给水系统；从送风机来的冷空气在暖空器中经换热升温后进入空预器，在空预器中经热烟气进一步提高温度后进入锅炉；锅炉排出的热烟气依次经空预器降温、布袋除尘器除尘后，在引风机的牵引下进入低低温省煤器与从暖空器来的除盐水换热降温后进入脱硫塔脱硫，脱硫后的烟气经烟囱达标排放。The present invention also provides a method for the comprehensive utilization of the above-mentioned dual-pump back-pressure steam turbine device. The low-pressure steam discharged from the main steam turbine enters the back-pressure steam turbine to perform work after adjusting the flow rate through the steam inlet regulating valve. The high-speed gearbox drives the generator to generate electricity. The exhaust steam discharged from the back pressure steam turbine enters the air heater, exchanges heat with the cold air from the blower, and then condenses into desalted water and enters the low-temperature economizer. The hot flue gas from the induced draft fan enters the deaerator to remove oxygen after heat exchange and heat up, and the desalted water after deoxygenation is pressurized by the feed pump and then enters the water supply system of the boiler; the cold air from the blower is exchanged in the air heater After heating up, it enters the air preheater, where the hot flue gas further increases the temperature and then enters the boiler; the hot flue gas discharged from the boiler is cooled by the air preheater, dust is removed by the bag filter, and then enters under the traction of the induced draft fan. The low and low temperature economizer exchanges heat with the desalted water from the air heater to cool down and then enters the desulfurization tower for desulfurization, and the desulfurized flue gas is discharged through the chimney up to the standard.
作为本发明的优选实施方式，所述进入背压汽轮机的低压蒸汽的流量优选20～40t/h，温度优选为400～450℃，压力优选为3.0～4.0MPa。As a preferred embodiment of the present invention, the flow rate of the low-pressure steam entering the back pressure steam turbine is preferably 20-40t/h, the temperature is preferably 400-450°C, and the pressure is preferably 3.0-4.0MPa.
作为本发明的优选实施方式，所述从送风机来的冷空气的流量优选为250000～350000m3/h，温度优选为-5～30℃。As a preferred embodiment of the present invention, the flow rate of the cold air from the blower is preferably 250000-350000 m 3 /h, and the temperature is preferably -5-30°C.
本发明的双拖电泵背压汽轮机综合利用装置，为了克服暖空器提高了锅炉烟气排烟温度，降低了机组热效率的不足，在引风机和脱硫塔之间设置低低温省煤器，低低温省煤器的应用不但利用了通过暖空器加热空气后凝结的疏水，又将暖空器抬高的锅炉烟温显著降低，回收烟气余热，提高除盐水温度，增强锅炉整体利用率。本发明克服了低低温省煤器将锅炉烟温降低后，导致脱硫塔水平衡破坏的问题，从而避免了降低低低温省煤器使用流量的缺陷。本发明中暖空器与低低温省煤器的配合不但解决了排烟温度高的问题，也提高了低低温省煤器的利用效率。本发明的双拖电泵背压汽轮机综合利用装置，大大减少了能源损耗，提高了设备以及能源利用率，增加了经济效益。The comprehensive utilization device of the double-driven electric pump back pressure steam turbine of the present invention, in order to overcome the improvement of the boiler flue gas exhaust temperature by the air heater and reduce the thermal efficiency of the unit, a low-low temperature economizer is installed between the induced draft fan and the desulfurization tower, The application of low and low temperature economizer not only utilizes the water condensed after heating the air through the air heater, but also significantly reduces the temperature of the boiler flue gas raised by the air heater, recovers the waste heat of the flue gas, increases the temperature of demineralized water, and enhances the overall utilization of the boiler . The invention overcomes the problem that the water balance of the desulfurization tower is destroyed after the low-low temperature economizer lowers the boiler flue temperature, thereby avoiding the defect of reducing the flow rate of the low-low temperature economizer. The cooperation of the air heater and the low-low temperature economizer in the present invention not only solves the problem of high exhaust gas temperature, but also improves the utilization efficiency of the low-low temperature economizer. The comprehensive utilization device of the double-driven electric pump back pressure steam turbine of the present invention greatly reduces energy consumption, improves equipment and energy utilization rate, and increases economic benefits.
本发明的双拖电泵背压汽轮机综合利用装置可充分发挥背压汽轮机的做功能力，其排汽可用于锅炉空预器和暖空器气源，既提高了设备利用率，又解决了空预器低温腐蚀堵灰的问题。The comprehensive utilization device of the back pressure steam turbine with double drag electric pumps of the present invention can give full play to the working ability of the back pressure steam turbine, and its exhaust steam can be used as the air source of the boiler air preheater and air heater, which not only improves the utilization rate of the equipment, but also solves the problem of The problem of low-temperature corrosion and ash blocking of air preheater.
与现有技术相比，本发明具有如下优点：Compared with prior art, the present invention has following advantage:
1、本发明最大限度的提高了背压汽轮机的利用效率，不但利用背压汽轮机双拖给水泵和发电机，并利用其排汽解决锅炉空预器低温腐蚀堵灰以及冬天锅炉进风温度低的问题，提高了锅炉热效率，锅炉进风温度提高了40℃以上。1. The present invention maximizes the utilization efficiency of the back-pressure steam turbine, not only using the back-pressure steam turbine to double-drag the feedwater pump and generator, but also using its exhaust steam to solve the problem of low-temperature corrosion and dust blocking of the boiler air preheater and the low temperature of the boiler inlet air in winter The problem is that the thermal efficiency of the boiler is improved, and the temperature of the boiler inlet air is increased by more than 40°C.
2、本发明采用暖空器搭配低低温省煤器使用，不但利用了通过暖空器加热空气后凝结的除盐水，又将暖空器抬高的锅炉烟温显著降低，回收烟气余热，提高除盐水温度，增强锅炉整体利用率，锅炉烟温降低了42～46℃，除盐水温度达到93℃以上。2. The present invention uses an air heater with a low-low temperature economizer, which not only utilizes the demineralized water condensed after the air is heated by the air heater, but also significantly reduces the boiler smoke temperature raised by the air heater, and recovers the waste heat of the flue gas. Increase the temperature of desalinated water, enhance the overall utilization of the boiler, reduce the boiler smoke temperature by 42-46°C, and the temperature of desalinated water reaches above 93°C.
3、本发明中使用的低低温省煤器的U型换热管材质可采用PTFE，减少了低温腐蚀以及设备磨损，提高了设备安全性。3. The U-shaped heat exchange tube material of the low-low temperature economizer used in the present invention can be PTFE, which reduces low-temperature corrosion and equipment wear and improves equipment safety.
4、本发明克服了现有技术暖空器因疏水进入除氧器而增设疏水泵等设备的不足，同时也克服了因疏水箱为降低疏水泵入口的汽蚀现象还要保持一定高度来产生压头，并针对疏水箱高低限位对疏水泵进行频繁启停导致控制操作繁琐和疏水泵高故障率的不足，本发明将暖空器疏水进入低低温省煤器，省去疏水泵等设备，节约了能耗，提高了安全可靠性。4. The present invention overcomes the shortcomings of the prior art that the air heater needs to add drainage pumps and other equipment due to the drainage of water into the deaerator, and also overcomes the need to maintain a certain height for the drainage box to reduce the cavitation phenomenon at the inlet of the drainage pump. The pressure head, and the frequent start and stop of the drain pump for the high and low limits of the drain tank lead to cumbersome control operations and high failure rates of the drain pump. The invention drains the air heater into the low and low temperature economizer, saving the drain pump and other equipment , saving energy consumption and improving safety and reliability.
5、本发明采用可抽式暖空器，当暖风系统检修时，可抽式暖空器可减少对锅炉烟气流动阻力，具有明显节能降耗效果。5. The present invention adopts a pumpable air heater. When the heating system is overhauled, the pumpable air heater can reduce the flow resistance of the boiler flue gas, and has obvious energy-saving and consumption-reducing effects.
附图说明Description of drawings
图1为本发明的双拖电泵背压汽轮机综合利用装置的流程示意图。Fig. 1 is a schematic flow diagram of the comprehensive utilization device of the double electric pump back pressure steam turbine of the present invention.
图中，给水泵1、背压汽轮机2、调速齿轮箱3、发电机4、暖空器5、空预器6、锅炉7、布袋除尘器8、引风机9、低低温省煤器10、脱硫塔11、烟囱12、送风机13、除氧器14、进汽调节阀15。In the figure, feed water pump 1, back pressure steam turbine 2, speed control gearbox 3, generator 4, air heater 5, air preheater 6, boiler 7, bag filter 8, induced draft fan 9, low and low temperature economizer 10 , desulfurization tower 11, chimney 12, blower 13, deaerator 14, steam inlet regulating valve 15.
具体实施方式Detailed ways
如图1所示，本发明的双拖电泵背压汽轮机综合利用装置，包括给水泵1、背压汽轮机2、调速齿轮箱3、发电机4、暖空器5、送风机13、空预器6、锅炉7、布袋除尘器8、引风机9、低低温省煤器10、除氧器14、脱硫塔11、烟囱12，背压汽轮机2的第一输出轴与给水泵1的输入轴相连，背压汽轮机2的第二输出轴与调速齿轮箱3的输入轴相连，调速齿轮箱3的输出轴与发电机4的输入轴相连，背压汽轮机2的排汽口与暖空器5的蒸汽进口相连，暖空器5的出水口与低低温省煤器10的除盐水进口相连，低低温省煤器10的除盐水出口与除氧器14的除盐水进口连接，除氧器14的除盐水出口与给水泵2的除盐水进口相连，给水泵2的除盐水出口与锅炉7的除盐水进口连接，送风机13的出风口与暖空器5的进风口相连，暖空器5的出风口与空预器6的进风口相连，空预器6的出风口与锅炉7的进风口相连，锅炉7的出口烟道与空预器6的烟气进口连接，空预器6的烟气出口与布袋除尘器8的烟气进口相连，布袋除尘器8的烟气出口与引风机9的进口相连，引风机9的出口与低低温省煤器10的烟气进口相连，低低温省煤器10的烟气出口与脱硫塔11的进口相连，脱硫塔11的出口与烟囱12的进口连接。背压汽轮机2还设置有蒸汽进口管，蒸汽进口管上设置有进汽调节阀15，以精确控制蒸汽流量。As shown in Fig. 1, the comprehensive utilization device of the double drag electric pump back pressure steam turbine of the present invention comprises a feedwater pump 1, a back pressure steam turbine 2, a speed regulating gear box 3, a generator 4, an air heater 5, a blower 13, an air preheater 6, boiler 7, bag filter 8, induced draft fan 9, low and low temperature economizer 10, deaerator 14, desulfurization tower 11, chimney 12, the first output shaft of back pressure steam turbine 2 and the input shaft of feed water pump 1 The second output shaft of the back pressure steam turbine 2 is connected with the input shaft of the speed regulating gearbox 3, the output shaft of the speed regulating gearbox 3 is connected with the input shaft of the generator 4, and the exhaust port of the back pressure steam turbine 2 is connected with the warm air The steam inlet of the air heater 5 is connected, the water outlet of the air heater 5 is connected with the desalted water inlet of the low and low temperature economizer 10, the desalted water outlet of the low and low temperature economizer 10 is connected with the desalted water inlet of the deaerator 14, and the deaeration The desalted water outlet of the device 14 is connected with the desalted water inlet of the feed water pump 2, the desalted water outlet of the feed water pump 2 is connected with the desalted water inlet of the boiler 7, the air outlet of the blower 13 is connected with the air inlet of the air heater 5, and the air heater The air outlet of 5 is connected with the air inlet of air preheater 6, the air outlet of air preheater 6 is connected with the air inlet of boiler 7, the outlet flue of boiler 7 is connected with the flue gas inlet of air preheater 6, and the air preheater 6 The flue gas outlet of the bag filter 8 is connected to the flue gas inlet of the bag filter 8, the flue gas outlet of the bag filter 8 is connected to the inlet of the induced draft fan 9, and the outlet of the induced draft fan 9 is connected to the flue gas inlet of the low-low temperature economizer 10. The flue gas outlet of the low-temperature economizer 10 is connected to the inlet of the desulfurization tower 11 , and the outlet of the desulfurization tower 11 is connected to the inlet of the chimney 12 . The back pressure steam turbine 2 is also provided with a steam inlet pipe, and a steam inlet regulating valve 15 is arranged on the steam inlet pipe to precisely control the steam flow.
本发明的双拖电泵背压汽轮机综合利用装置工作流程为：从主汽轮机排出的低压蒸汽通过进汽调节阀15调节流量后进入背压汽轮机2做功，背压汽轮机2一边驱动给水泵1，同时通过调速齿轮箱3带动发电机4发电，从背压汽轮机2排出的乏汽进入暖空器5，与从送风机13来的冷空气换热后凝结成除盐水进入低低温省煤器10，在低低温省煤器10中与从引风机9来的热烟气换热升温后进入除氧器14除氧，除氧后的除盐水经给水泵1加压后进入锅炉7的给水系统；从送风机13来的冷空气在暖空器5中经换热升温后进入空预器6，在空预器6中经热烟气进一步提高温度后进入锅炉7参与燃烧；锅炉7燃烧后排出的热烟气依次经空预器6降温、布袋除尘器8除尘后，在引风机9的牵引下进入低低温省煤器10与从暖空器5来的冷凝水换热降温后进入脱硫塔11脱硫，脱硫后的烟气经烟囱12达标排放。The working process of the comprehensive utilization device of the back pressure steam turbine of the present invention is as follows: the low-pressure steam discharged from the main steam turbine enters the back pressure steam turbine 2 to perform work after the flow is adjusted by the steam inlet regulating valve 15, and the back pressure steam turbine 2 drives the feed water pump 1, At the same time, the generator 4 is driven by the speed-regulating gearbox 3 to generate electricity. The exhausted steam discharged from the back pressure steam turbine 2 enters the air heater 5, exchanges heat with the cold air from the blower 13, and condenses into desalted water and enters the low-temperature economizer 10. In the low and low temperature economizer 10, it exchanges heat with the hot flue gas from the induced draft fan 9 and then enters the deaerator 14 for deaeration. The cold air from blower 13 enters the air preheater 6 after heat exchange and temperature rise in the air heater 5, and enters the boiler 7 to participate in combustion after the hot flue gas further increases the temperature in the air preheater 6; the boiler 7 is discharged after burning The hot flue gas is cooled by the air preheater 6 and dedusted by the bag filter 8 in turn, and then enters the low and low temperature economizer 10 under the traction of the induced draft fan 9 to exchange heat with the condensed water from the air heater 5 and then enter the desulfurization tower 11 desulfurization, and the flue gas after desulfurization is discharged through the chimney 12 up to the standard.
以下结合附图及具体实施例，对本发明作进一步的详细描述。但本发明并不仅限于所述的实施例。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. However, the invention is not limited to the described exemplary embodiments.
实施例1Example 1
一种双拖电泵背压汽轮机综合利用装置，包括给水泵1、背压汽轮机2、调速齿轮箱3、发电机4、暖空器5(可抽式)、送风机13、空预器6、锅炉7、布袋除尘器8、引风机9、低低温省煤器10(包括一组材质为PTFE的U型换热管)、除氧器14、脱硫塔11、烟囱12，背压汽轮机2的第一输出轴与给水泵1的输入轴相连，背压汽轮机2的第二输出轴与调速齿轮箱3的输入轴相连，调速齿轮箱3的输出轴与发电机4的输入轴相连，背压汽轮机2的排汽口与暖空器5的蒸汽进口相连，暖空器5的出水口与低低温省煤器10的除盐水进口相连，低低温省煤器10的除盐水出口与除氧器14的除盐水进口连接，除氧器14的除盐水出口与给水泵2的除盐水进口相连，给水泵2的除盐水出口与锅炉7的除盐水进口连接，送风机13的出风口与暖空器5的进风口相连，暖空器5的出风口与空预器6的进风口相连，空预器6的出风口与锅炉7的进风口相连，锅炉7的出口烟道与空预器6的烟气进口连接，空预器6的烟气出口与布袋除尘器8的烟气进口相连，布袋除尘器8的烟气出口与引风机9的进口相连，引风机9的出口与低低温省煤器10的烟气进口相连，低低温省煤器10的烟气出口与脱硫塔11的进口相连，脱硫塔11的出口与烟囱12的进口连接。背压汽轮机2还设置有蒸汽进口管，蒸汽进口管上设置有进汽调节阀15，以精确控制蒸汽流量。A comprehensive utilization device for a back pressure steam turbine with double drag electric pumps, including a feed water pump 1, a back pressure steam turbine 2, a speed regulating gear box 3, a generator 4, an air heater 5 (extractable), a blower 13, and an air preheater 6 , boiler 7, bag filter 8, induced draft fan 9, low and low temperature economizer 10 (including a set of U-shaped heat exchange tubes made of PTFE), deaerator 14, desulfurization tower 11, chimney 12, back pressure steam turbine 2 The first output shaft of the pump is connected to the input shaft of the feed water pump 1, the second output shaft of the back pressure steam turbine 2 is connected to the input shaft of the speed regulating gearbox 3, and the output shaft of the speed regulating gearbox 3 is connected to the input shaft of the generator 4 , the exhaust port of the back pressure steam turbine 2 is connected with the steam inlet of the air heater 5, the water outlet of the air heater 5 is connected with the desalted water inlet of the low and low temperature economizer 10, and the desalted water outlet of the low and low temperature economizer 10 is connected with the The desalted water inlet of the deaerator 14 is connected, the desalted water outlet of the deaerator 14 is connected with the desalted water inlet of the feed water pump 2, the desalted water outlet of the feed water pump 2 is connected with the desalted water inlet of the boiler 7, and the air outlet of the blower 13 is connected with the desalted water inlet of the feed water pump 2. The air inlet of the air heater 5 is connected, the air outlet of the air heater 5 is connected with the air inlet of the air preheater 6, the air outlet of the air preheater 6 is connected with the air inlet of the boiler 7, the outlet flue of the boiler 7 is connected with the air preheater The flue gas inlet of the air preheater 6 is connected to the flue gas inlet of the air preheater 6, the flue gas inlet of the bag filter 8 is connected, the flue gas outlet of the bag filter 8 is connected to the inlet of the induced draft fan 9, and the outlet of the induced draft fan 9 is connected to the low The flue gas inlet of the low-temperature economizer 10 is connected, the flue gas outlet of the low-temperature economizer 10 is connected with the inlet of the desulfurization tower 11 , and the outlet of the desulfurization tower 11 is connected with the inlet of the chimney 12 . The back pressure steam turbine 2 is also provided with a steam inlet pipe, and a steam inlet regulating valve 15 is arranged on the steam inlet pipe to precisely control the steam flow.
运行参数：进入背压汽轮机的低压蒸汽的流量为30t/h，温度为410℃，压力为3.35Mpa；从送风机来的冷空气的流量为320000m3/h，温度为15℃。Operating parameters: The flow rate of low-pressure steam entering the back pressure steam turbine is 30t/h, the temperature is 410°C, and the pressure is 3.35Mpa; the flow rate of cold air from the blower is 320000m 3 /h, and the temperature is 15°C.
运行效果：进入暖空器的冷空气的温度为15℃，出暖空器的空气温度为55℃；进入低低温省煤器的热烟气的温度为145℃，出低低温省煤器的热烟气的温度为100℃；进入低低温省煤器的除盐水的温度为60℃，出低低温省煤器的除盐水的温度为97℃；发电机发电量为200kw。空预器未出现低温腐蚀堵灰现象。Operation effect: the temperature of the cold air entering the air heater is 15°C, the temperature of the air exiting the air heater is 55°C; the temperature of the hot flue gas entering the low-low temperature economizer is 145°C, The temperature of the hot flue gas is 100°C; the temperature of the desalted water entering the low and low temperature economizer is 60°C, and the temperature of the desalted water leaving the low and low temperature economizer is 97°C; the power generation capacity of the generator is 200kw. The air preheater has no low-temperature corrosion and ash blocking phenomenon.
实施例2Example 2
一种双拖电泵背压汽轮机综合利用装置，包括给水泵1、背压汽轮机2、调速齿轮箱3、发电机4、暖空器5(可抽式)、送风机13、空预器6、锅炉7、布袋除尘器8、引风机9、低低温省煤器10(包括三组材质为PTFE的U型换热管)、除氧器14、脱硫塔11、烟囱12，背压汽轮机2的第一输出轴与给水泵1的输入轴相连，背压汽轮机2的第二输出轴与调速齿轮箱3的输入轴相连，调速齿轮箱3的输出轴与发电机4的输入轴相连，背压汽轮机2的排汽口与暖空器5的蒸汽进口相连，暖空器5的出水口与低低温省煤器10的除盐水进口相连，低低温省煤器10的除盐水出口与除氧器14的除盐水进口连接，除氧器14的除盐水出口与给水泵2的除盐水进口相连，给水泵2的除盐水出口与锅炉7的除盐水进口连接，送风机13的出风口与暖空器5的进风口相连，暖空器5的出风口与空预器6的进风口相连，空预器6的出风口与锅炉7的进风口相连，锅炉7的出口烟道与空预器6的烟气进口连接，空预器6的烟气出口与布袋除尘器8的烟气进口相连，布袋除尘器8的烟气出口与引风机9的进口相连，引风机9的出口与低低温省煤器10的烟气进口相连，低低温省煤器10的烟气出口与脱硫塔11的进口相连，脱硫塔11的出口与烟囱12的进口连接。背压汽轮机2还设置有蒸汽进口管，蒸汽进口管上设置有进汽调节阀15，以精确控制蒸汽流量。A comprehensive utilization device for a back pressure steam turbine with double drag electric pumps, including a feed water pump 1, a back pressure steam turbine 2, a speed regulating gear box 3, a generator 4, an air heater 5 (extractable), a blower 13, and an air preheater 6 , boiler 7, bag filter 8, induced draft fan 9, low and low temperature economizer 10 (including three sets of U-shaped heat exchange tubes made of PTFE), deaerator 14, desulfurization tower 11, chimney 12, back pressure steam turbine 2 The first output shaft of the pump is connected to the input shaft of the feed water pump 1, the second output shaft of the back pressure steam turbine 2 is connected to the input shaft of the speed regulating gearbox 3, and the output shaft of the speed regulating gearbox 3 is connected to the input shaft of the generator 4 , the exhaust port of the back pressure steam turbine 2 is connected with the steam inlet of the air heater 5, the water outlet of the air heater 5 is connected with the desalted water inlet of the low and low temperature economizer 10, and the desalted water outlet of the low and low temperature economizer 10 is connected with the The desalted water inlet of the deaerator 14 is connected, the desalted water outlet of the deaerator 14 is connected with the desalted water inlet of the feed water pump 2, the desalted water outlet of the feed water pump 2 is connected with the desalted water inlet of the boiler 7, and the air outlet of the blower 13 is connected with the desalted water inlet of the feed water pump 2. The air inlet of the air heater 5 is connected, the air outlet of the air heater 5 is connected with the air inlet of the air preheater 6, the air outlet of the air preheater 6 is connected with the air inlet of the boiler 7, the outlet flue of the boiler 7 is connected with the air preheater The flue gas inlet of the air preheater 6 is connected to the flue gas inlet of the air preheater 6, the flue gas inlet of the bag filter 8 is connected, the flue gas outlet of the bag filter 8 is connected to the inlet of the induced draft fan 9, and the outlet of the induced draft fan 9 is connected to the low The flue gas inlet of the low-temperature economizer 10 is connected, the flue gas outlet of the low-temperature economizer 10 is connected with the inlet of the desulfurization tower 11 , and the outlet of the desulfurization tower 11 is connected with the inlet of the chimney 12 . The back pressure steam turbine 2 is also provided with a steam inlet pipe, and a steam inlet regulating valve 15 is arranged on the steam inlet pipe to precisely control the steam flow.
运行参数：进入背压汽轮机的低压蒸汽的流量为28t/h，温度为414℃，压力为3.5MPa；从送风机来的冷空气的流量为300000m3/h，温度为10℃。Operating parameters: The flow rate of low-pressure steam entering the back pressure steam turbine is 28t/h, the temperature is 414°C, and the pressure is 3.5MPa; the flow rate of cold air from the blower is 300000m 3 /h, and the temperature is 10°C.
运行效果：进入暖空器的冷空气的温度为10℃，出暖空器的空气温度为53℃；进入低低温省煤器的热烟气的温度为143℃，出低低温省煤器的热烟气的温度为100℃；进入低低温省煤器的除盐水的温度为58℃，出低低温省煤器的除盐水的温度为95℃；发电机发电量为210kw。空预器未出现低温腐蚀堵灰现象。Operation effect: the temperature of the cold air entering the air heater is 10°C, the temperature of the air exiting the air heater is 53°C; the temperature of the hot flue gas entering the low-low temperature economizer is 143°C, and the temperature of the air exiting the The temperature of the hot flue gas is 100°C; the temperature of the desalted water entering the low and low temperature economizer is 58°C, and the temperature of the desalted water leaving the low and low temperature economizer is 95°C; the power generation capacity of the generator is 210kw. The air preheater has no low-temperature corrosion and ash blocking phenomenon.
实施例3Example 3
一种双拖电泵背压汽轮机综合利用装置，包括给水泵1、背压汽轮机2、调速齿轮箱3、发电机4、暖空器5(可抽式)、送风机13、空预器6、锅炉7、布袋除尘器8、引风机9、低低温省煤器10(包括四组材质为PTFE的U型换热管)、除氧器14、脱硫塔11、烟囱12，背压汽轮机2的第一输出轴与给水泵1的输入轴相连，背压汽轮机2的第二输出轴与调速齿轮箱3的输入轴相连，调速齿轮箱3的输出轴与发电机4的输入轴相连，背压汽轮机2的排汽口与暖空器5的蒸汽进口相连，暖空器5的出水口与低低温省煤器10的除盐水进口相连，低低温省煤器10的除盐水出口与除氧器14的除盐水进口连接，除氧器14的除盐水出口与给水泵2的除盐水进口相连，给水泵2的除盐水出口与锅炉7的除盐水进口连接，送风机13的出风口与暖空器5的进风口相连，暖空器5的出风口与空预器6的进风口相连，空预器6的出风口与锅炉7的进风口相连，锅炉7的出口烟道与空预器6的烟气进口连接，空预器6的烟气出口与布袋除尘器8的烟气进口相连，布袋除尘器8的烟气出口与引风机9的进口相连，引风机9的出口与低低温省煤器10的烟气进口相连，低低温省煤器10的烟气出口与脱硫塔11的进口相连，脱硫塔11的出口与烟囱12的进口连接。背压汽轮机2还设置有蒸汽进口管，蒸汽进口管上设置有进汽调节阀15，以精确控制蒸汽流量。A comprehensive utilization device for a back pressure steam turbine with double drag electric pumps, including a feed water pump 1, a back pressure steam turbine 2, a speed regulating gear box 3, a generator 4, an air heater 5 (extractable), a blower 13, and an air preheater 6 , boiler 7, bag filter 8, induced draft fan 9, low and low temperature economizer 10 (including four sets of U-shaped heat exchange tubes made of PTFE), deaerator 14, desulfurization tower 11, chimney 12, back pressure steam turbine 2 The first output shaft of the pump is connected to the input shaft of the feed water pump 1, the second output shaft of the back pressure steam turbine 2 is connected to the input shaft of the speed regulating gearbox 3, and the output shaft of the speed regulating gearbox 3 is connected to the input shaft of the generator 4 , the exhaust port of the back pressure steam turbine 2 is connected with the steam inlet of the air heater 5, the water outlet of the air heater 5 is connected with the desalted water inlet of the low and low temperature economizer 10, and the desalted water outlet of the low and low temperature economizer 10 is connected with the The desalted water inlet of the deaerator 14 is connected, the desalted water outlet of the deaerator 14 is connected with the desalted water inlet of the feed water pump 2, the desalted water outlet of the feed water pump 2 is connected with the desalted water inlet of the boiler 7, and the air outlet of the blower 13 is connected with the desalted water inlet of the feed water pump 2. The air inlet of the air heater 5 is connected, the air outlet of the air heater 5 is connected with the air inlet of the air preheater 6, the air outlet of the air preheater 6 is connected with the air inlet of the boiler 7, the outlet flue of the boiler 7 is connected with the air preheater The flue gas inlet of the air preheater 6 is connected to the flue gas inlet of the air preheater 6, the flue gas inlet of the bag filter 8 is connected, the flue gas outlet of the bag filter 8 is connected to the inlet of the induced draft fan 9, and the outlet of the induced draft fan 9 is connected to the low The flue gas inlet of the low-temperature economizer 10 is connected, the flue gas outlet of the low-temperature economizer 10 is connected with the inlet of the desulfurization tower 11 , and the outlet of the desulfurization tower 11 is connected with the inlet of the chimney 12 . The back pressure steam turbine 2 is also provided with a steam inlet pipe, and a steam inlet regulating valve 15 is arranged on the steam inlet pipe to precisely control the steam flow.
运行参数：进入背压汽轮机的低压蒸汽的流量为25t/h，温度为414℃，压力为3.5MPa；从送风机来的冷空气的流量为280000m3/h，温度为5℃。Operating parameters: The flow rate of low-pressure steam entering the back pressure steam turbine is 25t/h, the temperature is 414°C, and the pressure is 3.5MPa; the flow rate of cold air from the blower is 280000m 3 /h, and the temperature is 5°C.
运行效果：进入暖空器的冷空气的温度为5℃，出暖空器的空气温度为50℃；进入低低温省煤器的热烟气的温度为142℃，出低低温省煤器的热烟气的温度为100℃；进入低低温省煤器的除盐水的温度为55℃，出低低温省煤器的除盐水的温度为93℃；发电机发电量为270kw。空预器未出现低温腐蚀堵灰现象。Operation effect: the temperature of the cold air entering the air heater is 5°C, the temperature of the air exiting the air heater is 50°C; the temperature of the hot flue gas entering the low-low temperature economizer is 142°C, The temperature of the hot flue gas is 100°C; the temperature of the desalted water entering the low and low temperature economizer is 55°C, and the temperature of the desalted water leaving the low and low temperature economizer is 93°C; the power generation capacity of the generator is 270kw. The air preheater has no low-temperature corrosion and ash blocking phenomenon.
实施例4Example 4
一种双拖电泵背压汽轮机综合利用装置，包括给水泵1、背压汽轮机2、调速齿轮箱3、发电机4、暖空器5(可抽式)、送风机13、空预器6、锅炉7、布袋除尘器8、引风机9、低低温省煤器10(包括五组材质为PTFE的U型换热管)、除氧器14、脱硫塔11、烟囱12，背压汽轮机2的第一输出轴与给水泵1的输入轴相连，背压汽轮机2的第二输出轴与调速齿轮箱3的输入轴相连，调速齿轮箱3的输出轴与发电机4的输入轴相连，背压汽轮机2的排汽口与暖空器5的蒸汽进口相连，暖空器5的出水口与低低温省煤器10的除盐水进口相连，低低温省煤器10的除盐水出口与除氧器14的除盐水进口连接，除氧器14的除盐水出口与给水泵2的除盐水进口相连，给水泵2的除盐水出口与锅炉7的除盐水进口连接，送风机13的出风口与暖空器5的进风口相连，暖空器5的出风口与空预器6的进风口相连，空预器6的出风口与锅炉7的进风口相连，锅炉7的出口烟道与空预器6的烟气进口连接，空预器6的烟气出口与布袋除尘器8的烟气进口相连，布袋除尘器8的烟气出口与引风机9的进口相连，引风机9的出口与低低温省煤器10的烟气进口相连，低低温省煤器10的烟气出口与脱硫塔11的进口相连，脱硫塔11的出口与烟囱12的进口连接。背压汽轮机2还设置有蒸汽进口管，蒸汽进口管上设置有进汽调节阀15，以精确控制蒸汽流量。A comprehensive utilization device for a back pressure steam turbine with double drag electric pumps, including a feed water pump 1, a back pressure steam turbine 2, a speed regulating gear box 3, a generator 4, an air heater 5 (extractable), a blower 13, and an air preheater 6 , boiler 7, bag filter 8, induced draft fan 9, low and low temperature economizer 10 (including five sets of U-shaped heat exchange tubes made of PTFE), deaerator 14, desulfurization tower 11, chimney 12, back pressure steam turbine 2 The first output shaft of the pump is connected to the input shaft of the feed water pump 1, the second output shaft of the back pressure steam turbine 2 is connected to the input shaft of the speed regulating gearbox 3, and the output shaft of the speed regulating gearbox 3 is connected to the input shaft of the generator 4 , the exhaust port of the back pressure steam turbine 2 is connected with the steam inlet of the air heater 5, the water outlet of the air heater 5 is connected with the desalted water inlet of the low and low temperature economizer 10, and the desalted water outlet of the low and low temperature economizer 10 is connected with the The desalted water inlet of the deaerator 14 is connected, the desalted water outlet of the deaerator 14 is connected with the desalted water inlet of the feed water pump 2, the desalted water outlet of the feed water pump 2 is connected with the desalted water inlet of the boiler 7, and the air outlet of the blower 13 is connected with the desalted water inlet of the feed water pump 2. The air inlet of the air heater 5 is connected, the air outlet of the air heater 5 is connected with the air inlet of the air preheater 6, the air outlet of the air preheater 6 is connected with the air inlet of the boiler 7, the outlet flue of the boiler 7 is connected with the air preheater The flue gas inlet of the air preheater 6 is connected to the flue gas inlet of the air preheater 6, the flue gas inlet of the bag filter 8 is connected, the flue gas outlet of the bag filter 8 is connected to the inlet of the induced draft fan 9, and the outlet of the induced draft fan 9 is connected to the low The flue gas inlet of the low-temperature economizer 10 is connected, the flue gas outlet of the low-temperature economizer 10 is connected with the inlet of the desulfurization tower 11 , and the outlet of the desulfurization tower 11 is connected with the inlet of the chimney 12 . The back pressure steam turbine 2 is also provided with a steam inlet pipe, and a steam inlet regulating valve 15 is arranged on the steam inlet pipe to precisely control the steam flow.
运行参数：进入背压汽轮机的低压蒸汽的流量为32t/h，温度为420℃，压力为4.0MPa；从送风机来的冷空气的流量为320000m3/h，温度为15℃。Operating parameters: The flow rate of low-pressure steam entering the back pressure steam turbine is 32t/h, the temperature is 420°C, and the pressure is 4.0MPa; the flow rate of cold air from the blower is 320000m 3 /h, and the temperature is 15°C.
运行效果：进入暖空器的冷空气的温度为15℃，出暖空器的空气温度为57℃；进入低低温省煤器的热烟气的温度为146℃，出低低温省煤器的热烟气的温度为100℃；进入低低温省煤器的除盐水的温度为50℃，出低低温省煤器的除盐水的温度为96℃；发电机发电量为170kw。空预器未出现低温腐蚀堵灰现象。Operation effect: the temperature of the cold air entering the air heater is 15°C, the temperature of the air exiting the air heater is 57°C; the temperature of the hot flue gas entering the low-low temperature economizer is 146°C, and the temperature of the air exiting the The temperature of the hot flue gas is 100°C; the temperature of the desalted water entering the low and low temperature economizer is 50°C, and the temperature of the desalted water leaving the low and low temperature economizer is 96°C; the power generation capacity of the generator is 170kw. The air preheater has no low-temperature corrosion and ash blocking phenomenon.
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Denomination of invention: A comprehensive utilization device and method for a back pressure steam turbine with a dual drag electric pump Granted publication date: 20230915 Pledgee: Juhua Group Finance Co.,Ltd. Pledgor: ZHEJIANG JUHUA THERMAL POWER CO.,LTD. Registration number: Y2023980075763 |
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