CN208920038U - A kind of thermal power plant's combined type Two-way Cycle fume afterheat effective utilization system - Google Patents

A kind of thermal power plant's combined type Two-way Cycle fume afterheat effective utilization system Download PDF

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CN208920038U
CN208920038U CN201821539018.9U CN201821539018U CN208920038U CN 208920038 U CN208920038 U CN 208920038U CN 201821539018 U CN201821539018 U CN 201821539018U CN 208920038 U CN208920038 U CN 208920038U
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low
level
outlet
inlet
economizer
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王林
伍刚
张亚夫
高景辉
王红雨
孟颖琪
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Xian Thermal Power Research Institute Co Ltd
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Thermal Power Research Institute
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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
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

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Abstract

本实用新型公开了一种火电厂组合式双循环烟气余热高效利用系统，凝结水输入管道的出口及二次风暖风器的出口与9号低压加热器的入口相连通，9号低压加热器的出口与8号低压加热器的入口相连通，8号低压加热器的出口与7号低压加热器的入口、一级增压泵的入口及二级增压泵的入口相连通，二级增压泵的出口经二级低温省煤器与二次风暖风器的入口相连通，一级增压泵的出口与一级低温省煤器后段的入口相连通，一级低温省煤器后段的出口分为三路，其中，第一路与一级增压泵的入口相连通，第二路与一级低温省煤器前段的入口相连通，第三路与一级低温省煤器前段的出口及7号低压加热器的出口相连通，该系统能够适用于加装有布袋除尘器的机组中。

The utility model discloses a combined double-cycle flue gas waste heat efficient utilization system for thermal power plants. The outlet of the heater is connected with the inlet of the No. 8 low-pressure heater, and the outlet of the No. 8 low-pressure heater is connected with the inlet of the No. 7 low-pressure heater, the inlet of the primary booster pump and the inlet of the secondary booster pump. The outlet of the booster pump is communicated with the inlet of the secondary air heater through the secondary low temperature economizer, and the outlet of the primary booster pump is communicated with the inlet of the rear section of the primary low temperature economizer. The outlet of the rear section of the boiler is divided into three routes, of which the first route is communicated with the inlet of the first-stage booster pump, the second route is communicated with the inlet of the first-stage low-temperature economizer, and the third route is communicated with the first-stage low-temperature economizer. The outlet of the front section of the coal burner is connected with the outlet of the No. 7 low-pressure heater, and the system can be applied to the unit equipped with a bag filter.

Description

A kind of thermal power plant's combined type Two-way Cycle fume afterheat effective utilization system
Technical field
The utility model belongs to thermal power plant's heat recovery field, is related to more than a kind of thermal power plant's combined type Two-way Cycle flue gas Hot effective utilization system.
Background technique
Station boiler flue gas loss is that a most important heat loss, the exhaust gas temperature of station boiler are usual in boiler operatiopn It is 120~150 DEG C, corresponding heat loss is equivalent to the 5%~12% of fuel heat, accounts for the 60%~70% of boiler heat loss. For the economy for improving power plant, it is necessary to reduce exhaust gas temperature, reduce flue gas loss, therefore low temperature province has all been installed additional in most of power plant Coal device, to recycle flue gas heat.
Low-level (stack-gas) economizer is one group of heated surface bundle, when flue gas is flowed through herein, is exchanged heat with the water in pipe, to drop Low smoke temperature improves condensing water temperature.
Low-level (stack-gas) economizer is typically mounted between air preheater outlet and electric precipitation entrance, but for using electrostatic fabric filter Unit installs low-level (stack-gas) economizer in deduster entrance, it is low and Water vapor condensation occurs flue-gas temperature easily occurs, and then lead to cloth bag On there is water droplet, adhere to soot particle, it is hardened to occur cloth bag, influences dust removing effects.
In addition, power plant usually needs to install Secondary Air steam air heater, by auxiliary vapour to prevent air preheater from cold end low-temperature corrosion occurs For the steam of header supply as heating source, when unit starting, need to additionally consume starting trouble fuel.
Therefore, develop that a kind of bag filter unit, to be not required to the extraneous fume afterheat for providing heat source efficient suitable for installing additional Using system, it is of great significance for improving unit efficiency, promoting economy of power plant.
Utility model content
To solve problems of the prior art, it is double that the purpose of this utility model is to provide a kind of thermal power plant's combined types Circulating flue gas waste heat effective utilization system, which can be suitable for the unit for adding bag filter, and does not need outer Boundary provides heat source.
To reach the purpose of this utility model, thermal power plant's combined type Two-way Cycle fume afterheat described in the utility model is efficient It include that condensed water input channel, Secondary Air steam air heater, No. 9 low-pressure heaters, No. 8 low-pressure heaters, No. 7 low pressure add using system Hot device, one-level booster pump, two-stage supercharging pump, second level low-level (stack-gas) economizer, level-one low-level (stack-gas) economizer back segment and level-one low-level (stack-gas) economizer Leading portion；
The outlet of condensed water input channel and the outlet of Secondary Air steam air heater are connected with the entrance of No. 9 low-pressure heaters, and 9 The outlet of number low-pressure heater is connected with the entrance of No. 8 low-pressure heaters, and the outlet of No. 8 low-pressure heaters adds with No. 7 low pressure The entrance of the entrance of hot device, the entrance of one-level booster pump and two-stage supercharging pump is connected, and the outlet of two-stage supercharging pump is low through second level Warm economizer is connected with the entrance of Secondary Air steam air heater, the outlet of one-level booster pump and the entrance of level-one low-level (stack-gas) economizer back segment It is connected, the outlet of level-one low-level (stack-gas) economizer back segment is divided into three tunnels, wherein the first via is connected with the entrance of one-level booster pump, Second tunnel is connected with the entrance of level-one low-level (stack-gas) economizer leading portion, outlet and No. 7 of the third road with level-one low-level (stack-gas) economizer leading portion The outlet of low-pressure heater is connected；
Wherein, level-one low-level (stack-gas) economizer leading portion is installed in thermal power plant between bag filter and air-introduced machine, a grade low-temp Economizer back segment and second level low-level (stack-gas) economizer are located in thermal power plant between air-introduced machine and desulfurizing tower, and level-one low-level (stack-gas) economizer back segment And second level low-level (stack-gas) economizer is set gradually along flow of flue gas direction, it is pre- that Secondary Air steam air heater is located at pressure fan and air in thermal power plant Between hot device.
Further include the low province's back-water valve (BWV) of second level and hot air hose bypass valve, wherein one end of hot air hose bypass valve with The outlet of second level low-level (stack-gas) economizer is connected, one end of the low province's back-water valve (BWV) of second level and the other end and two of hot air hose bypass valve The outlet of secondary wind steam air heater is connected, and the other end of the low province's back-water valve (BWV) of second level is connected with the entrance of No. 9 low-pressure heaters.
It further include the low province's inlet adjustment valve of level-one and the low province's inlet adjustment valve of second level, wherein the low province's inlet adjustment valve of level-one One end and one end of the low province's inlet adjustment valve of second level be connected with the outlet of No. 8 low-pressure heaters, the low province's entrance tune of second level The other end of section valve is connected with the entrance that two-stage supercharging pumps, the other end of the low province's inlet adjustment valve of level-one and one-level booster pump Entrance is connected.
It further include recycling regulating valve, wherein recycle one end of regulating valve and the outlet of level-one low-level (stack-gas) economizer back segment It is connected, the other end for recycling regulating valve is connected with the entrance of one-level booster pump.
It further include the low province's bypass valve of level-one and the low province's back-water valve (BWV) of level-one, wherein the one of the low province's bypass valve of level-one End is connected with the outlet of level-one low-level (stack-gas) economizer back segment, one end province's bypass valve low with level-one of the low province's back-water valve (BWV) of level-one Outlet and the outlet of level-one low-level (stack-gas) economizer leading portion are connected, the other end of the low province's back-water valve (BWV) of level-one and No. 7 low-pressure heaters Outlet is connected.
Compared with prior art, the utility model has the following beneficial effects:
When specific operation, cloth bag removes thermal power plant's combined type Two-way Cycle fume afterheat effective utilization system of the utility model The flue gas of dirt device output is successively through the heat exchange of level-one low-level (stack-gas) economizer leading portion, air-introduced machine, level-one low-level (stack-gas) economizer back segment heat exchange and two It is discharged after the heat exchange of grade low-temp economizer through desulfurizing tower and chimney, to realize while realizing that flue gas is cooling to condensed water Then heating heats the cold Secondary Air in Secondary Air steam air heater by the condensed water after heating, enter to improve The temperature of cold Secondary Air in burner hearth further promotes the temperature of flue gas, avoids leading to bag-type dust since flue-gas temperature is too low The problem that device is hardened, dust removing effects are poor.It avoids the problem that cold end low-temperature corrosion occurs for air preheater simultaneously, while not needing outer Boundary provides heat source.
Detailed description of the invention
The structural schematic diagram of Fig. 1 the utility model；
Fig. 2 is the location drawing of the utility model installation.
Wherein, 1 it is the low province's inlet adjustment valve of level-one, 2 be one-level booster pump, 3 is level-one low-level (stack-gas) economizer back segment, 4 for again Circulating regulation valve, 5 be level-one low-level (stack-gas) economizer leading portion, 6 be the low province's bypass valve of level-one, 7 be the low province's back-water valve (BWV) of level-one, 8 be The low province's inlet adjustment valve of second level, 9 be two-stage supercharging pump, 10 be second level low-level (stack-gas) economizer, 11 be Secondary Air steam air heater, 12 be second level Low province's back-water valve (BWV), 13 be hot air hose bypass valve, 14 be No. 7 low-pressure heaters, 15 be No. 8 low-pressure heaters, 16 be No. 9 low Press heater.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.
As shown in Figures 1 and 2, thermal power plant's combined type Two-way Cycle fume afterheat effective utilization system described in the utility model Including condensed water input channel, 15, No. 7 low-pressure heatings of low-pressure heater of low-pressure heater 16,8 of Secondary Air steam air heater 11,9 Device 14, one-level booster pump 2, two-stage supercharging pump 9, second level low-level (stack-gas) economizer 10, level-one low-level (stack-gas) economizer back segment 3 and a grade low-temp save Coal device leading portion 5；The outlet of condensed water input channel and the outlet of Secondary Air steam air heater 11 and the entrance phase of No. 9 low-pressure heaters 16 Connection, the outlet of No. 9 low-pressure heaters 16 are connected with the entrance of No. 8 low-pressure heaters 15, the outlet of No. 8 low-pressure heaters 15 It is connected with the entrance of the entrance of No. 7 low-pressure heaters 14, the entrance of one-level booster pump 2 and two-stage supercharging pump 9, two-stage supercharging pump 9 outlet is connected through second level low-level (stack-gas) economizer 10 with the entrance of Secondary Air steam air heater 11, the outlet and level-one of one-level booster pump 2 The entrance of low-level (stack-gas) economizer back segment 3 is connected, and the outlet of level-one low-level (stack-gas) economizer back segment 3 is divided into three tunnels, wherein the first via and one The entrance of grade booster pump 2 is connected, and the second tunnel is connected with the entrance of level-one low-level (stack-gas) economizer leading portion 5, and third road is low with level-one The outlet of warm economizer leading portion 5 and the outlet of No. 7 low-pressure heaters 14 are connected；Wherein, level-one low-level (stack-gas) economizer leading portion 5 is installed In thermal power plant between bag filter and air-introduced machine, level-one low-level (stack-gas) economizer back segment 3 and second level low-level (stack-gas) economizer 10 are located at fire In power plant between air-introduced machine and desulfurizing tower, and level-one low-level (stack-gas) economizer back segment 3 and second level low-level (stack-gas) economizer 10 are along flow of flue gas side To setting gradually, Secondary Air steam air heater 11 is located in thermal power plant between pressure fan and air preheater.
The utility model further includes the low province's back-water valve (BWV) 12 of second level and hot air hose bypass valve 13, wherein hot air hose bypass One end of regulating valve 13 is connected with the outlet of second level low-level (stack-gas) economizer 10, by one end of the low province's back-water valve (BWV) 12 of second level and hot air hose The outlet of the other end and Secondary Air steam air heater 11 of road regulating valve 13 is connected, the other end of the low province's back-water valve (BWV) 12 of second level and No. 9 The entrance of low-pressure heater 16 is connected.
The utility model further includes the low province's inlet adjustment valve 1 of level-one and the low province's inlet adjustment valve 8 of second level, wherein level-one is low One end of one end and the low province's inlet adjustment valve 8 of second level for saving inlet adjustment valve 1 is connected with the outlet of No. 8 low-pressure heaters 15 Logical, the other end of the low province's inlet adjustment valve 8 of second level is connected with the entrance of two-stage supercharging pump 9, the low province's inlet adjustment valve 1 of level-one The other end is connected with the entrance of one-level booster pump 2.
The utility model further includes recycling regulating valve 4, wherein one end of recycling regulating valve 4 and a grade low-temp save coal The outlet of device back segment 3 is connected, and the other end of recycling regulating valve 4 is connected with the entrance of one-level booster pump 2.
The utility model further includes the low province's bypass valve 6 of level-one and the low province's back-water valve (BWV) 7 of level-one, wherein by the low province of level-one One end of road regulating valve 6 is connected with the outlet of level-one low-level (stack-gas) economizer back segment 3, one end of the low province's back-water valve (BWV) 7 of level-one and level-one The outlet of low province's bypass valve 6 and the outlet of level-one low-level (stack-gas) economizer leading portion 5 are connected, the low province's back-water valve (BWV) 7 of level-one it is another End is connected with the outlet of No. 7 low-pressure heaters 14.
The specific work process of the utility model are as follows:
Bag filter output flue gas enter in level-one low-level (stack-gas) economizer leading portion 5, and with level-one low-level (stack-gas) economizer leading portion 5 Interior water exchanges heat, and flue-gas temperature is reduced to 105 DEG C by 140 DEG C, and the flue gas after cooling makes its temperature through air-introduced machine compressed action Degree rises to 113 DEG C, enters back into level-one low-level (stack-gas) economizer back segment 3, and exchange heat with the water in level-one low-level (stack-gas) economizer back segment 3, So that flue-gas temperature continues to be reduced to 95 DEG C, then into second level low-level (stack-gas) economizer 10, and with second level low-level (stack-gas) economizer 10 Interior water exchanges heat, so that flue-gas temperature is reduced to 75 DEG C or so, is most discharged after desulfurizing tower is handled from chimney afterwards.
Condensed water is entered level-one by the low province's inlet adjustment valve 1 of level-one and is pressurized by the export supply of No. 8 low-pressure heaters 15 In pump 2, the condensed water after pressurization enters in level-one low-level (stack-gas) economizer back segment 3, then with after flue gas heat exchange, the temperature of condensed water is by 70 DEG C or so be increased to 88 DEG C or so；Condensed water advances in level-one low-level (stack-gas) economizer leading portion 5, and carries out heat exchange with flue gas and rise Temperature makes its temperature be increased to 120 DEG C or so, is back to condensate line eventually by the low province's back-water valve (BWV) 7 of level-one, No. 8 low pressure add The condensed water that hot device 15 exports enters in second level low-level (stack-gas) economizer 10 through the low province's inlet adjustment valve 8 of second level, two-stage supercharging pump 9, and Heat exchange heating is carried out with flue gas in second level low-level (stack-gas) economizer 10, so that the water temperature of condensed water is increased to 85 DEG C of left sides by 65 DEG C or so The right side subsequently enters in Secondary Air steam air heater 11, and exchanges heat in Secondary Air steam air heater 11 with cold Secondary Air, so that water temperature drops To 53 DEG C or so, cold Secondary Air temperature is increased to 70 DEG C or so.
The low province's inlet adjustment valve 1 of level-one and the low province's inlet adjustment valve 8 of second level are used to adjust the entrance of level-one low-level (stack-gas) economizer Water temperature, recycling regulating valve 4 is also used for the adjusting of level-one low-level (stack-gas) economizer inlet water temperature in underload: by adjusting hot water Recirculation volume makes the water temperature of level-one low-level (stack-gas) economizer entrance not less than 70 DEG C.
The low province's bypass valve 6 of level-one is for adjusting the water flow for flowing through level-one low-level (stack-gas) economizer leading portion 5, when a grade low-temp When the smoke temperature that economizer leading portion 5 exports is higher, the low province's bypass valve 6 of level-one is turned down, when level-one low-level (stack-gas) economizer leading portion 5 exports Smoke temperature it is relatively low when, tune up the low province's bypass valve 6 of level-one, hot air hose bypass valve 13 is for controlling Secondary Air steam air heater 11 The secondary air temperature of outlet reduces the hot water amount for flowing through Secondary Air steam air heater 11 when wind-warm syndrome is higher, i.e. increase hot air hose bypass is adjusted Section 13 aperture of valve need to increase the hot water amount for flowing through Secondary Air steam air heater 11 when wind-warm syndrome is relatively low, turn down hot air hose bypass at this time and adjust Save valve 13.
To sum up, flue gas passes through multiple gas-water heat exchangers, and waste heat is fully recycled, and realizes condensing water temperature With the promotion of Secondary Air temperature, unit coal consumption is reduced, unit efficiency is improved.In addition, the utility model uses two sections of two-stage Design, substantially increases flue gas waste heat recovery efficiency, using the modular design of low-level (stack-gas) economizer water steam air heater, the heat of recycling For heat-setting water and cold Secondary Air, unit coal consumption is significantly reduced, promotes unit efficiency.In addition, two-stage low temperature economizer water Side is independent Two-way Cycle, realizes that respective water recycles by the booster pump being equipped with.The investment of two-stage low temperature economizer, exit and therefore Barrier shuts down and is independent of each other, and greatly improves the reliability of system.

Claims (5)

1.一种火电厂组合式双循环烟气余热高效利用系统，其特征在于，包括凝结水输入管道、二次风暖风器(11)、9号低压加热器(16)、8号低压加热器(15)、7号低压加热器(14)、一级增压泵(2)、二级增压泵(9)、二级低温省煤器(10)、一级低温省煤器后段(3)及一级低温省煤器前段(5)；1. a thermal power plant combined dual-cycle flue gas waste heat efficient utilization system, is characterized in that, comprises condensate input pipeline, secondary air heater (11), No. 9 low-pressure heater (16), No. 8 low-pressure heating (15), No. 7 low-pressure heater (14), primary booster pump (2), secondary booster pump (9), secondary low temperature economizer (10), rear section of primary low temperature economizer (3) and the front section (5) of the first-level low-temperature economizer; 凝结水输入管道的出口及二次风暖风器(11)的出口与9号低压加热器(16)的入口相连通，9号低压加热器(16)的出口与8号低压加热器(15)的入口相连通，8号低压加热器(15)的出口与7号低压加热器(14)的入口、一级增压泵(2)的入口及二级增压泵(9)的入口相连通，二级增压泵(9)的出口经二级低温省煤器(10)与二次风暖风器(11)的入口相连通，一级增压泵(2)的出口与一级低温省煤器后段(3)的入口相连通，一级低温省煤器后段(3)的出口分为三路，其中，第一路与一级增压泵(2)的入口相连通，第二路与一级低温省煤器前段(5)的入口相连通，第三路与一级低温省煤器前段(5)的出口及7号低压加热器(14)的出口相连通；The outlet of the condensate input pipe and the outlet of the secondary air heater (11) are connected to the inlet of the No. 9 low-pressure heater (16), and the outlet of the No. 9 low-pressure heater (16) is connected to the No. 8 low-pressure heater (15). ), the outlet of the No. 8 low-pressure heater (15) is connected to the inlet of the No. 7 low-pressure heater (14), the inlet of the primary booster pump (2) and the inlet of the secondary booster pump (9). The outlet of the secondary booster pump (9) is communicated with the inlet of the secondary air heater (11) through the secondary low temperature economizer (10), and the outlet of the primary booster pump (2) is connected to the inlet of the secondary air heater (11). The inlet of the rear section (3) of the low-temperature economizer is connected, and the outlet of the rear section (3) of the first-stage low-temperature economizer is divided into three paths, wherein the first path is connected with the inlet of the first-stage booster pump (2). , the second road is communicated with the inlet of the front section (5) of the first-stage low-temperature economizer, and the third road is communicated with the outlet of the first-stage low-temperature economizer (5) and the outlet of the No. 7 low-pressure heater (14); 其中，一级低温省煤器前段(5)安装于火电厂中布袋除尘器与引风机之间，一级低温省煤器后段(3)及二级低温省煤器(10)位于火电厂中引风机与脱硫塔之间，且一级低温省煤器后段(3)及二级低温省煤器(10)沿烟气流动方向依次设置，二次风暖风器(11)位于火电厂中送风机与空气预热器之间。Among them, the front section (5) of the first-level low-temperature economizer is installed between the bag filter and the induced draft fan in the thermal power plant, and the rear section (3) of the first-level low-temperature economizer and the second-level low-temperature economizer (10) are located in the thermal power plant. Between the intermediate induced draft fan and the desulfurization tower, and the rear section (3) of the first-stage low-temperature economizer and the second-stage low-temperature economizer (10) are arranged in sequence along the flue gas flow direction, the secondary air heater (11) is located in the fire zone. Between the blower and the air preheater in the power plant. 2.根据权利要求1所述的火电厂组合式双循环烟气余热高效利用系统，其特征在于，还包括二级低省回水阀(12)及暖风管旁路调节阀(13)，其中，暖风管旁路调节阀(13)的一端与二级低温省煤器(10)的出口相连通，二级低省回水阀(12)的一端与暖风管旁路调节阀(13)的另一端及二次风暖风器(11)的出口相连通，二级低省回水阀(12)的另一端与9号低压加热器(16)的入口相连通。2. The thermal power plant combined dual-cycle flue gas waste heat efficient utilization system according to claim 1, characterized in that, further comprising a secondary low-return water-saving valve (12) and a heating duct bypass regulating valve (13), Wherein, one end of the bypass regulating valve (13) of the warm air pipe is communicated with the outlet of the secondary low temperature economizer (10), and one end of the secondary low saving return water valve (12) is connected to the bypass regulating valve (12) of the hot air pipe. The other end of 13) is communicated with the outlet of the secondary air heater (11), and the other end of the secondary low return water valve (12) is communicated with the inlet of the No. 9 low pressure heater (16). 3.根据权利要求1所述的火电厂组合式双循环烟气余热高效利用系统，其特征在于，还包括一级低省入口调节阀(1)及二级低省入口调节阀(8)，其中，一级低省入口调节阀(1)的一端及二级低省入口调节阀(8)的一端均与8号低压加热器(15)的出口相连通，二级低省入口调节阀(8)的另一端与二级增压泵(9)的入口相连通，一级低省入口调节阀(1)的另一端与一级增压泵(2)的入口相连通。3. The thermal power plant combined dual-cycle flue gas waste heat efficient utilization system according to claim 1, characterized in that, further comprising a first-level low provincial inlet regulating valve (1) and a secondary low provincial inlet regulating valve (8), Among them, one end of the first-level low-pressure inlet regulating valve (1) and one end of the second-level low-pressure inlet regulating valve (8) are connected with the outlet of the No. 8 low-pressure heater (15), and the second-level low-pressure inlet regulating valve ( The other end of 8) is communicated with the inlet of the secondary booster pump (9), and the other end of the primary low provincial inlet regulating valve (1) is communicated with the inlet of the primary booster pump (2). 4.根据权利要求1所述的火电厂组合式双循环烟气余热高效利用系统，其特征在于，还包括再循环调节阀(4)，其中，再循环调节阀(4)的一端与一级低温省煤器后段(3)的出口相连通，再循环调节阀(4)的另一端与一级增压泵(2)的入口相连通。4. The thermal power plant combined dual-cycle flue gas waste heat efficient utilization system according to claim 1, characterized in that, further comprising a recirculation regulating valve (4), wherein one end of the recirculation regulating valve (4) is connected to the primary The outlet of the rear section (3) of the low-temperature economizer is communicated, and the other end of the recirculation regulating valve (4) is communicated with the inlet of the primary booster pump (2). 5.根据权利要求1所述的火电厂组合式双循环烟气余热高效利用系统，其特征在于，还包括一级低省旁路调节阀(6)及一级低省回水阀(7)，其中，一级低省旁路调节阀(6)的一端与一级低温省煤器后段(3)的出口相连通，一级低省回水阀(7)的一端与一级低省旁路调节阀(6)的出口及一级低温省煤器前段(5)的出口相连通，一级低省回水阀(7)的另一端与7号低压加热器(14)的出口相连通。5. The thermal power plant combined dual-cycle flue gas waste heat efficient utilization system according to claim 1, characterized in that, further comprising a first-level low-saving bypass regulating valve (6) and a first-level low-saving return water valve (7) , wherein, one end of the first-level low economizer bypass regulating valve (6) is connected with the outlet of the rear section (3) of the first-level low-temperature economizer, and one end of the first-level low economizer return valve (7) is connected to the first-level low economizer. The outlet of the bypass regulating valve (6) is connected with the outlet of the front section (5) of the primary low temperature economizer, and the other end of the primary low economizer return valve (7) is connected with the outlet of the No. 7 low pressure heater (14). Pass.
CN201821539018.9U 2018-09-19 2018-09-19 A kind of thermal power plant's combined type Two-way Cycle fume afterheat effective utilization system Withdrawn - After Issue CN208920038U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110594774A (en) * 2019-09-12 2019-12-20 中国电力工程顾问集团西南电力设计院有限公司 A thermal power plant air preheater cold end heater heating system
CN113310042A (en) * 2021-05-21 2021-08-27 华能国际电力股份有限公司大连电厂 Low-temperature coal-saving self-adjusting system for thermal power plant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110594774A (en) * 2019-09-12 2019-12-20 中国电力工程顾问集团西南电力设计院有限公司 A thermal power plant air preheater cold end heater heating system
CN113310042A (en) * 2021-05-21 2021-08-27 华能国际电力股份有限公司大连电厂 Low-temperature coal-saving self-adjusting system for thermal power plant
CN113310042B (en) * 2021-05-21 2022-11-29 华能国际电力股份有限公司大连电厂 Low-temperature economizer self-adjusting system for thermal power plant

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