CN112304105A - Cascade utilization system for flue gas waste heat of alkali furnace - Google Patents

Cascade utilization system for flue gas waste heat of alkali furnace Download PDF

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Publication number
CN112304105A
CN112304105A CN202011325707.1A CN202011325707A CN112304105A CN 112304105 A CN112304105 A CN 112304105A CN 202011325707 A CN202011325707 A CN 202011325707A CN 112304105 A CN112304105 A CN 112304105A
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China
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low
flue gas
pressure heater
outlet
temperature economizer
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CN202011325707.1A
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李楠
张知翔
邹小刚
车宏伟
薛宁
周飞
徐党旗
李文锋
张广才
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Boiler Environmental Protection Engineering Co Ltd
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Priority to CN202011325707.1A priority Critical patent/CN112304105A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • 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
    • F22D1/003—Feed-water heater systems
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/20—Arrangements for treatment or cleaning of waste gases

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chimneys And Flues (AREA)

Abstract

本发明公开了一种碱炉烟气余热梯级利用系统，包括碱炉、布袋除尘器、管式GGH、鼓风机、热风炉、SCR脱硝装置、一级低温省煤器、二级低温省煤器、引风机以及烟囱，SCR脱硝装置采用高温金属催化剂，SCR脱硝装置的烟气入口温度由管式GGH的烟—烟换热以及热风炉出口热烟气混合两种手段来保证，低温省煤器分两级布置，一级低温省煤器布置在管式GGH的高温侧烟气出口，加热动力车间高压加热器给水，二级低温省煤器布置在一级低温省煤器的烟气出口，加热动力车间低压加热器给水，该系统能够稳定降低碱炉氮氧化物排放浓度，实现烟气余热梯级利用，提高能源利用效率和系统运行的经济性。

Figure 202011325707

The invention discloses a cascade utilization system for waste heat of alkali boiler flue gas, including alkali boiler, bag filter, tubular GGH, blower, hot blast stove, SCR denitration device, primary low temperature economizer, secondary low temperature economizer, The induced draft fan and chimney, SCR denitration device adopts high temperature metal catalyst, and the flue gas inlet temperature of SCR denitration device is guaranteed by the flue-smoke heat exchange of tubular GGH and the hot flue gas mixing at the outlet of hot blast stove. The low temperature economizer is divided into two methods. Two-stage arrangement, the first-stage low-temperature economizer is arranged at the flue gas outlet of the high temperature side of the tubular GGH to heat the feed water of the high-pressure heater in the power workshop, and the second-stage low-temperature economizer is arranged at the flue gas outlet of the first-stage low-temperature economizer, heating Low-pressure heater feed water in power workshop, the system can stably reduce the nitrogen oxide emission concentration of alkali boiler, realize the cascade utilization of flue gas waste heat, improve energy utilization efficiency and system operation economy.

Figure 202011325707

Description

Cascade utilization system for flue gas waste heat of alkali furnace
Technical Field
The invention belongs to the technical field of flue gas waste heat recovery, and relates to a cascade utilization system for flue gas waste heat of an alkali furnace.
Background
In recent years, the energy environmental protection system of China is continuously healthy, and strict energy environmental protection standards are continuously provided. In the technical policy of pollution control in the paper industry released by the ministry of environmental protection, emission control of atmospheric pollutants in the alkali furnace is emphasized and research and development of the technology for reducing emission of atmospheric pollutants in the alkali furnace is encouraged. Because the exhaust gas temperature of the alkali furnace is higher, if a high-temperature catalyst SCR device is adopted, the exhaust gas temperature is further increased, and the exhaust gas is directly discharged from a chimney, so that the energy waste is larger. In order to reduce the emission concentration of nitrogen oxides in the alkali furnace and save energy as much as possible, a system for recovering the waste heat of the flue gas and performing cascade utilization while stably reducing the emission concentration of nitrogen oxides in the alkali furnace is needed.
Disclosure of Invention
The invention aims to provide a gradient utilization system for flue gas waste heat of a soda furnace, which can stably reduce the emission concentration of nitric oxide in the soda furnace, simultaneously recover and utilize the high-temperature flue gas waste heat in a gradient manner, and improve the economical efficiency of system operation.
In order to achieve the aim, the cascade utilization system for the flue gas waste heat of the alkali furnace comprises the alkali furnace, a bag-type dust collector, a tubular GGH, an SCR denitration device, a primary low-temperature economizer, a secondary low-temperature economizer, a draught fan and a chimney;
the flue gas outlet of the alkali furnace is communicated with the flue gas inlet of the bag-type dust collector, the flue gas outlet of the bag-type dust collector is communicated with the low-temperature flue gas side inlet of the tubular GGH, the low-temperature flue gas side outlet of the tubular GGH is communicated with the flue gas inlet of the SCR denitration device, the flue gas outlet of the SCR denitration device is communicated with the high-temperature flue gas inlet of the tubular GGH, the high-temperature flue gas outlet of the tubular GGH is communicated with the flue gas inlet of the first-stage low-temperature economizer, the flue gas outlet of the first-stage low-temperature economizer is communicated with the flue gas inlet of the second-stage low-temperature economizer, the flue gas outlet of the second-stage low-temperature economizer is.
The SCR denitration device is characterized by further comprising a blower and a hot blast stove, an air outlet of the blower is communicated with an air inlet of the hot blast stove, and a flue gas outlet of the hot blast stove is communicated with a flue gas inlet of the SCR denitration device.
The catalyst in the SCR denitration device adopts a high-temperature metal catalyst.
The fuel of the hot blast stove is natural gas.
The device also comprises a secondary low-temperature economizer booster pump, a primary low-temperature economizer booster pump, a No. 8 low-pressure heater, a No. 7 low-pressure heater, a No. 6 low-pressure heater, a No. 5 low-pressure heater, a deaerator, a No. 3 high-pressure heater, a No. 2 high-pressure heater and a No. 1 high-pressure heater;
the No. 8 low-pressure heater, the No. 7 low-pressure heater, the No. 6 low-pressure heater, the No. 5 low-pressure heater, the deaerator, the No. 3 high-pressure heater, the No. 2 high-pressure heater and the No. 1 high-pressure heater are communicated in sequence;
a cold water inlet of the first-stage low-temperature economizer is communicated with an outlet of a booster pump of the first-stage low-temperature economizer, a booster inlet of the first-stage low-temperature economizer is communicated with an inlet of a No. 3 high-pressure heater, and a cold water outlet of the first-stage low-temperature economizer is communicated with an outlet of a No. 2 high-pressure heater;
the cold water inlet of the secondary low-temperature economizer is communicated with the outlet of a booster pump of the secondary low-temperature economizer, the inlet of the booster pump of the secondary low-temperature economizer is communicated with the inlet of the No. 8 low-pressure heater and the outlet of the No. 7 low-pressure heater, and the cold water outlet of the secondary low-temperature economizer is communicated with the outlet of the No. 6 low-pressure heater.
The inlet of the first-stage low-temperature economizer booster pump is communicated with the inlet of the No. 3 high-pressure heater through a first electric isolating valve.
And a cold water outlet of the first-stage low-temperature economizer is communicated with an outlet of the No. 2 high-pressure heater through a second electric isolating valve.
And a cold water outlet of the secondary low-temperature economizer is communicated with an outlet of the No. 6 low-pressure heater through a third electric isolating valve.
And an inlet of the second-stage low-temperature economizer booster pump is communicated with an outlet of the No. 7 low-pressure heater through a fourth electric isolating valve.
And the inlet of the second-stage low-temperature economizer booster pump is communicated with the inlet of the No. 8 low-pressure heater through a fifth electric isolating valve.
The invention has the following beneficial effects:
when the stepped utilization system for the flue gas waste heat of the alkali furnace is in specific operation, the tubular GGH is utilized to heat the temperature of the flue gas output by the bag-type dust collector, the high-temperature flue gas waste heat at the outlet of the SCR denitration device is fully utilized, and the external heat supplement quantity of the system is reduced. Simultaneously, high-temperature flue gas output by the hot blast stove is mixed with flue gas output by the low-temperature side of the tubular GGH, so that the temperature of the flue gas entering the SCR denitration device is increased, and the temperature of the flue gas is ensured to be within the normal working range of a high-temperature metal catalyst of the SCR denitration device. The hot blast stove adopts natural gas as fuel, and the pollutant concentration in the flue gas at the outlet of the hot blast stove is lower, so that the influence on the pollutant concentration at the outlet of the chimney is reduced. High-temperature flue gas waste heat at the outlet of the SCR denitration device is recovered through the primary low-temperature economizer and the secondary low-temperature economizer, according to the difference of flue gas temperature intervals, the flue gas waste heat recovered by the primary low-temperature economizer heats the feed water of a high-pressure heater between power vehicles, and the flue gas waste heat recovered by the secondary low-temperature economizer heats the feed water of a low-pressure heater between the power vehicles, so that the cascade utilization of the flue gas waste heat is realized, and the energy utilization efficiency and the economical efficiency of system operation are improved. The heat exchange tubes of the first-stage low-temperature economizer and the second-stage low-temperature economizer are made of different materials, so that the safe operation of the heat exchange tubes is guaranteed, and the project investment is reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Wherein, 1 is an alkali furnace, 2 is a bag-type dust collector, 3 is a tubular GGH, 4 is a blower, 5 is a hot blast furnace, 6 is an SCR denitration device, 7 is a primary low-temperature economizer, 8 is a secondary low-temperature economizer, 9 is a draught fan, 10 is a chimney, 11 is a No. 8 low-pressure heater, 12 is a No. 7 low-pressure heater, 13 is a No. 6 low-pressure heater, 14 is a No. 5 low-pressure heater, 15 is a deaerator, 16 is a No. 3 high-pressure heater, 17 is a No. 2 high-pressure heater, 18 is a No. 1 high-pressure heater, 19 is a fifth electric isolating valve, 20 is a secondary low-temperature economizer booster pump, and 21 is a primary low-temperature economizer booster pump.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the cascade utilization system for flue gas waste heat of an alkali furnace comprises an alkali furnace 1, a bag-type dust collector 2, a tubular GGH3, an SCR denitration device 6, a primary low-temperature economizer 7, a secondary low-temperature economizer 8, an induced draft fan 9 and a chimney 10; the flue gas outlet of the alkali furnace 1 is communicated with the flue gas inlet of the bag-type dust collector 2, the flue gas outlet of the bag-type dust collector 2 is communicated with the low-temperature flue gas side inlet of the tube-type GGH3, the low-temperature flue gas side outlet of the tube-type GGH3 is communicated with the flue gas inlet of the SCR denitration device 6, the flue gas outlet of the SCR denitration device 6 is communicated with the high-temperature flue gas inlet of the tube-type GGH3, the high-temperature flue gas outlet of the tube-type GGH3 is communicated with the flue gas inlet of the first-level low-temperature economizer 7, the flue gas outlet of the first-level low-temperature economizer 7 is communicated with the flue gas inlet of the second-level low-temperature economizer 8, the flue gas outlet of the second-level low.
The invention also comprises a blower 4 and a hot blast stove 5, wherein an air outlet of the blower 4 is communicated with an air inlet of the hot blast stove 5, and a flue gas outlet of the hot blast stove 5 is communicated with a flue gas inlet of the SCR denitration device 6.
The catalyst in the SCR denitration device 6 adopts a high-temperature metal catalyst; the fuel of the hot blast stove 5 adopts natural gas.
The invention also comprises a secondary low-temperature economizer booster pump 20, a primary low-temperature economizer booster pump 21, a No. 8 low-pressure heater 11, a No. 7 low-pressure heater 12, a No. 6 low-pressure heater 13, a No. 5 low-pressure heater 14, a deaerator 15, a No. 3 high-pressure heater 16, a No. 2 high-pressure heater 17 and a No. 1 high-pressure heater 18; a No. 8 low-pressure heater 11, a No. 7 low-pressure heater 12, a No. 6 low-pressure heater 13, a No. 5 low-pressure heater 14, a deaerator 15, a No. 3 high-pressure heater 16, a No. 2 high-pressure heater 17 and a No. 1 high-pressure heater 18 are communicated in sequence; a cold water inlet of the primary low-temperature economizer 7 is communicated with an outlet of a primary low-temperature economizer booster pump 21, an inlet of the primary low-temperature economizer booster pump 21 is communicated with an inlet of a No. 3 high-pressure heater 16, and a cold water outlet of the primary low-temperature economizer 7 is communicated with an outlet of a No. 2 high-pressure heater 17; the cold water inlet of the secondary low-temperature economizer 8 is communicated with the outlet of a secondary low-temperature economizer booster pump 20, the inlet of the secondary low-temperature economizer booster pump 20 is communicated with the inlet of a No. 8 low-pressure heater 11 and the outlet of a No. 7 low-pressure heater 12, and the cold water outlet of the secondary low-temperature economizer 8 is communicated with the outlet of a No. 6 low-pressure heater 13.
An inlet of the first-stage low-temperature economizer booster pump 21 is communicated with an inlet of the No. 3 high-pressure heater 16 through a first electric isolating valve; a cold water outlet of the first-stage low-temperature economizer 7 is communicated with an outlet of a No. 2 high-pressure heater 17 through a second electric isolating valve; a cold water outlet of the secondary low-temperature economizer 8 is communicated with an outlet of the No. 6 low-pressure heater 13 through a third electric isolating valve; an inlet of the second-stage low-temperature economizer booster pump 20 is communicated with an outlet of the No. 7 low-pressure heater 12 through a fourth electric isolating valve; the inlet of the secondary low-temperature economizer booster pump 20 is communicated with the inlet of the No. 8 low-pressure heater 11 through a fifth electric isolating valve 19.
The temperature of 180 ℃ flue gas output by the bag-type dust collector 2 is increased to 270 ℃ after passing through the pipe type GGH3, the flue gas is mixed with high-temperature flue gas output by the hot blast stove 5 and then enters the SCR denitration device 6 to be heated to 380 ℃, the high-temperature flue gas output by the SCR denitration device 6 is cooled to 280 ℃ after passing through the pipe type GGH3 and then enters the primary low-temperature economizer 7 to be cooled to 220 ℃, then enters the secondary low-temperature economizer 8 to be cooled to 100 ℃, and finally enters the chimney 10 through the induced draft fan 9 and finally is discharged into the atmosphere.
The condensed water output by the No. 8 low-pressure heater 11 is mixed with the condensed water output by the No. 7 low-pressure heater 12, the temperature of the mixed condensed water is 80 ℃, the mixed condensed water enters the second-stage low-temperature economizer 8 to be heated to 100 ℃, then the mixed condensed water is mixed with the condensed water output by the No. 6 low-pressure heater 13 and enters the No. 5 low-pressure heater 14, the 180 ℃ condensed water output by the deaerator 15 is divided into two paths, one path of the condensed water enters the No. 3 high-pressure heater 16, the other path of the condensed water enters the first-stage low-temperature economizer 7 to be heated to 250 ℃, and the condensed water output by the first-stage low-temperature economizer 7 enters the No. 1 high-.

Claims (10)

1.一种碱炉烟气余热梯级利用系统，其特征在于，包括碱炉(1)、布袋除尘器(2)、管式GGH(3)、鼓风机(4)、热风炉(5)、SCR脱硝装置(6)、一级低温省煤器(7)、二级低温省煤器(8)、引风机(9)及烟囱(10)；1. A cascade utilization system for waste heat of alkali furnace flue gas, characterized in that it comprises alkali furnace (1), bag filter (2), tubular GGH (3), blower (4), hot blast stove (5), SCR A denitration device (6), a first-level low-temperature economizer (7), a second-level low-temperature economizer (8), an induced draft fan (9) and a chimney (10); 碱炉(1)的烟气出口与布袋除尘器(2)的烟气入口相连通，布袋除尘器(2)的烟气出口与管式GGH(3)的低温烟气侧入口相连通，管式GGH(3)的低温烟气侧出口与SCR脱硝装置(6)的烟气入口相连通，SCR脱硝装置(6)的烟气出口与管式GGH(3)的高温侧烟气入口相连通，管式GGH(3)的高温侧烟气出口与一级低温省煤器(7)的烟气入口相连通，一级低温省煤器(7)的烟气出口与二级低温省煤器(8)的烟气入口相连通，二级低温省煤器(8)的烟气出口与引风机(9)的烟气入口相连通，引风机(9)的烟气出口与烟囱(10)相连通。The flue gas outlet of the recovery boiler (1) is communicated with the flue gas inlet of the bag filter (2), and the flue gas outlet of the bag filter (2) is communicated with the low-temperature flue gas side inlet of the tubular GGH (3). The low temperature flue gas side outlet of the type GGH (3) is communicated with the flue gas inlet of the SCR denitration device (6), and the flue gas outlet of the SCR denitration device (6) is communicated with the high temperature side flue gas inlet of the tubular GGH (3). , the flue gas outlet on the high temperature side of the tubular GGH (3) is connected with the flue gas inlet of the primary low temperature economizer (7), and the flue gas outlet of the primary low temperature economizer (7) is connected with the secondary low temperature economizer The flue gas inlet of (8) is communicated with, the flue gas outlet of the secondary low temperature economizer (8) is communicated with the flue gas inlet of the induced draft fan (9), and the flue gas outlet of the induced draft fan (9) is connected with the chimney (10) connected. 2.根据权利要求1所述的碱炉烟气余热梯级利用系统，其特征在于，还包括鼓风机(4)及热风炉(5)，鼓风机(4)的空气出口与热风炉(5)的空气入口相连通，热风炉(5)的烟气出口与SCR脱硝装置(6)的烟气入口相连通。2. The alkali boiler flue gas waste heat cascade utilization system according to claim 1, is characterized in that, also comprises blower (4) and hot blast stove (5), the air outlet of blower (4) and the air of hot blast stove (5) The inlets are communicated, and the flue gas outlet of the hot blast stove (5) is communicated with the flue gas inlet of the SCR denitration device (6). 3.根据权利要求1所述的碱炉烟气余热梯级利用系统，其特征在于，SCR脱硝装置(6)中的催化剂采用高温金属催化剂。3. The system for cascade utilization of waste heat from alkali boiler flue gas according to claim 1, characterized in that the catalyst in the SCR denitration device (6) adopts a high-temperature metal catalyst. 4.根据权利要求1所述的碱炉烟气余热梯级利用系统，其特征在于，热风炉(5)的燃料采用天然气。4. The cascade utilization system for waste heat of alkali boiler flue gas according to claim 1, characterized in that, the fuel of the hot blast stove (5) adopts natural gas. 5.根据权利要求1所述的碱炉烟气余热梯级利用系统，其特征在于，还包括二级低温省煤器增压泵(20)、一级低温省煤器增压泵(21)、8号低压加热器(11)、7号低压加热器(12)、6号低压加热器(13)、5号低压加热器(14)、除氧器(15)、3号高压加热器(16)、2号高压加热器(17)及1号高压加热器(18)；5. The alkali boiler flue gas waste heat cascade utilization system according to claim 1, characterized in that, further comprising a secondary low-temperature economizer booster pump (20), a primary low-temperature economizer booster pump (21), No. 8 low-pressure heater (11), No. 7 low-pressure heater (12), No. 6 low-pressure heater (13), No. 5 low-pressure heater (14), deaerator (15), No. 3 high-pressure heater (16 ), No. 2 high-pressure heater (17) and No. 1 high-pressure heater (18); 8号低压加热器(11)、7号低压加热器(12)、6号低压加热器(13)、5号低压加热器(14)、除氧器(15)、3号高压加热器(16)、2号高压加热器(17)及1号高压加热器(18)依次相连通；No. 8 low-pressure heater (11), No. 7 low-pressure heater (12), No. 6 low-pressure heater (13), No. 5 low-pressure heater (14), deaerator (15), No. 3 high-pressure heater (16 ), No. 2 high-pressure heater (17) and No. 1 high-pressure heater (18) are connected in turn; 一级低温省煤器(7)的冷水入口与一级低温省煤器增压泵(21)的出口相连通，一级低温省煤器增压泵(21)的入口与3号高压加热器(16)的入口相连通，一级低温省煤器(7)的冷水出口与2号高压加热器(17)出口相连通；The cold water inlet of the first-stage low-temperature economizer (7) is communicated with the outlet of the first-stage low-temperature economizer booster pump (21), and the inlet of the first-stage low-temperature economizer booster pump (21) is connected to the No. 3 high-pressure heater The inlet of (16) is communicated, and the cold water outlet of the first-stage low-temperature economizer (7) is communicated with the outlet of the No. 2 high-pressure heater (17); 二级低温省煤器(8)的冷水入口与二级低温省煤器增压泵(20)的出口相连通，二级低温省煤器增压泵(20)的入口与8号低压加热器(11)的入口及7号低压加热器(12)的出口相连通，二级低温省煤器(8)的冷水出口与6号低压加热器(13)的出口相连通。The cold water inlet of the secondary low-temperature economizer (8) is communicated with the outlet of the booster pump (20) of the secondary low-temperature economizer, and the inlet of the booster pump (20) of the secondary low-temperature economizer is connected to the No. 8 low-pressure heater The inlet of (11) is communicated with the outlet of No. 7 low-pressure heater (12), and the cold water outlet of the secondary low-temperature economizer (8) is communicated with the outlet of No. 6 low-pressure heater (13). 6.根据权利要求5所述的碱炉烟气余热梯级利用系统，其特征在于，一级低温省煤器增压泵(21)的入口与3号高压加热器(16)的入口通过第一电动隔离阀相连通。6. The waste heat utilization system of alkali boiler flue gas according to claim 5, characterized in that, the inlet of the first-stage low-temperature economizer booster pump (21) and the inlet of the No. 3 high-pressure heater (16) pass through the first The electric isolation valve is connected. 7.根据权利要求6所述的碱炉烟气余热梯级利用系统，其特征在于，一级低温省煤器(7)的冷水出口与2号高压加热器(17)出口通过第二电动隔离阀相连通。7. The cascade utilization system of waste heat from alkali boiler flue gas according to claim 6, characterized in that the outlet of cold water of the first-stage low-temperature economizer (7) and the outlet of No. 2 high-pressure heater (17) pass through the second electric isolation valve connected. 8.根据权利要求7所述的碱炉烟气余热梯级利用系统，其特征在于，二级低温省煤器(8)的冷水出口与6号低压加热器(13)的出口通过第三电动隔离阀相连通。8. The waste heat utilization system of alkali boiler flue gas according to claim 7, characterized in that the outlet of cold water of the secondary low-temperature economizer (8) and the outlet of the No. 6 low-pressure heater (13) are electrically isolated by the third valve is connected. 9.根据权利要求8所述的碱炉烟气余热梯级利用系统，其特征在于，二级低温省煤器增压泵(20)的入口与7号低压加热器(12)的出口通过第四电动隔离阀相连通。9 . The waste heat utilization system of alkali boiler flue gas according to claim 8 , wherein the inlet of the secondary low-temperature economizer booster pump ( 20 ) and the outlet of the No. 7 low-pressure heater ( 12 ) pass through the fourth The electric isolation valve is connected. 10.根据权利要求9所述的碱炉烟气余热梯级利用系统，其特征在于，二级低温省煤器增压泵(20)的入口与8号低压加热器(11)的入口通过第五电动隔离阀(19)相连通。10. The cascade utilization system for waste heat of alkali boiler flue gas according to claim 9, wherein the inlet of the secondary low-temperature economizer booster pump (20) and the inlet of the No. 8 low-pressure heater (11) pass through the fifth The electric isolation valve (19) is connected.
CN202011325707.1A 2020-11-23 2020-11-23 Cascade utilization system for flue gas waste heat of alkali furnace Pending CN112304105A (en)

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