CN105841176A - Desulfurization and denitration clean exhausting device for low-temperature waste gas - Google Patents

Desulfurization and denitration clean exhausting device for low-temperature waste gas Download PDF

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Publication number
CN105841176A
CN105841176A CN201610295101.5A CN201610295101A CN105841176A CN 105841176 A CN105841176 A CN 105841176A CN 201610295101 A CN201610295101 A CN 201610295101A CN 105841176 A CN105841176 A CN 105841176A
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China
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mggh
temperature
flue gas
ggh
composite phase
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CN201610295101.5A
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Chinese (zh)
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CN105841176B (en
Inventor
李延平
刘兴
束海涛
王少云
汤峰
汤一峰
徐文龙
黄海波
朱瑞贺
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山东岱荣节能环保科技有限公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/08Arrangements of devices for treating smoke or fumes of heaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/20Sulfur; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/15081Reheating of flue gases
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The invention provides a desulfurization and denitration clean exhausting device for low-temperature waste gas. The desulfurization and denitration clean exhausting device for low-temperature waste gas comprises a desulfurization device, a combustion device, a denitrcation device and a chimney which are connected in sequence through pipelines. A GGH, an MGGH cold end and a composite phase-change heat exchange device condensation end are sequentially connected between the desulfurization device and the combustion device through pipelines. A composite phase-change heat exchange device evaporation end and an MGGH hot end are connected between the denitrcation device and the chimney through pipelines. The GGH is arranged at an inlet of the desulfurization device to lower the temperature of untreated flue gas, the consumption of water and the consumption of power in a desulfurization tower are reduced on the one hand, and the power consumption of a desulfurization fan is reduced on the other hand. A composite phase-change heat exchange device and an MGGH are arranged, the heat of denitrated flue gas is utilized to heat the to-be-denitrated flue gas. Compared with the way of heating the to-be-denitrated flue gas with fuel solely, the energy consumption is lowered, heat is reasonably used, and the economical value is high.

Description

The desulphurization denitration clean emission device of low temperature waste gas
Technical field
The present invention relates to fume emission technical field, particularly relate to SO2And NOXThe desulphurization denitration clean emission device of low temperature (120-180 DEG C) waste gas that content is higher.
Background technology
Along with becoming increasingly conspicuous of global environmental problems, " 12 " planning proposes, China SO to be realized2Discharge minimizing 8%, NOx emission reduces 10%, for current exhaust gas temperature at the flue gas of 120-180 DEG C, in conjunction with existing desulfurizing and denitrifying process temperature requirement, the technique of denitration after the first desulfurization of employing, the mode that most enterprises uses is that flue gas is directly entered desulfurizer desulfurization, and the flue gas after desulfurization is mixed by the high-temperature flue gas exported with burner, subsequently into denitrification apparatus denitration, the flue gas after denitration passes through smoke stack emission after lowering the temperature directly or through other cooling methods.
It is known that the efficient operation temperature province of desulfurizer is at 80-110 DEG C, efficient, the stable operating temperature range of high temperature denitrification apparatus is at 320-350 DEG C, and according to the temperature characterisitic of desulfurizing and denitrifying process, the flue gas of 120-180 DEG C uses the technique of denitration after first desulfurization.
Owing to the optimum working temperature scope of desulfurizer is 80-110 DEG C, and 120-180 DEG C of flue gas is directly entered desulfurizer, can consume substantial amounts of cooling water, and power consumption also accordingly increases simultaneously, and can cause the increase of desulfurization blower fan load;On the other hand, flue-gas temperature after desulfurization completes is 50-60 DEG C, and efficient, the stable operating temperature range of high temperature denitrification apparatus is at 320-350 DEG C, flue gas after desulfurization need to be warming up to 320-350 DEG C and carry out denitration again, and the flue gas after denitration need to discharge after lowering the temperature, flue gas after desulfurization uses burner to heat up, and causes waste of fuel, less economical.
Summary of the invention
It is an object of the invention to, overcome the deficiencies in the prior art, it is provided that the desulphurization denitration clean emission device of a kind of low temperature waste gas, solve less economical problem, ensure system stability safe operation simultaneously.
For solving above-mentioned technical problem, the technical scheme is that the desulphurization denitration clean emission device that a kind of low temperature waste gas is provided, including the desulfurizer being sequentially connected with by pipeline, burner, denitrification apparatus and chimney, described tapping equipment also includes GGH, MGGH and composite phase-change heat-exchanger rig, it is sequentially connected with GGH by pipeline between described desulfurizer and burner, the cold end of MGGH and the condensation end of composite phase-change heat-exchanger rig, connected evaporation ends and the MGGH hot junction of composite phase-change heat-exchanger rig by pipeline between described denitrification apparatus and chimney, the hot side air intake of described GGH connects gas, the gas outlet, hot side of GGH is connected with the air inlet of desulfurizer, the cold side air intake of GGH is connected with the gas outlet of desulfurizer.
nullThe air inlet of the hot side of described GGH is passed through the original low-temperature flue gas of 120-180 DEG C,Described original low-temperature flue gas is entered desulfurizer by the gas outlet of the hot side of GGH after GGH lowers the temperature and carries out desulfurization,Original low-temperature flue gas after lowering the temperature in GGH becomes low temperature neat stress after entering desulfurizer desulfurization,The low temperature neat stress that desulfurization completes is entered in GGH by the cold side air intake of GGH and heats up,By GGH, original low-temperature flue gas is lowered the temperature,And preheat from desulfurizer low temperature neat stress out,Neat stress after desulfurization is heated by the heat utilizing former flue gas,Reach former flue gas cool-down and the effect of neat stress preheating simultaneously,Low temperature neat stress can be preheated to 70-80 DEG C,The low temperature neat stress that desulfurization completes enters the condensation end of composite phase-change heat-exchanger rig in GGH the most afterwards and heats up,After intensification by mix with burner high-temperature flue gas out temperature is warming up to 320-350 DEG C after enter denitrification apparatus carry out denitration,The evaporation ends of the gas entrance composite phase-change heat-exchanger rig after denitration enters follow-up system after lowering the temperature.Described burner is provided with blast furnace gas entrance, utilizes blast furnace gas to heat flue gas.
Circulation is formed by drum between evaporation ends and the condensation end of described composite phase-change heat-exchanger rig, steam condition is become after the heat of the condensed water absorption high-temperature flue gas of composite phase-change heat-exchanger rig evaporation ends, heat is supplied to after the flue gas heated up become coagulation state and returns again to composite phase-change heat-exchanger rig evaporation ends absorption heat by steam arrival composite phase-change heat-exchanger rig condensation end, so circulation, with water as medium, utilize the flue gas before the heat denitration of the flue gas after denitration, with simple by fuel, the cigarette temperature in 50-60 DEG C of desulfurizer exit is directly heated up compared with, decrease the consumption of fuel, by heat Appropriate application, economy is high.Described composite phase-change heat-exchanger rig also includes that control system, described control system control the pressure of described composite phase-change heat-exchanger rig, and pressure is corresponding with temperature, and described control system controls the temperature of tube wall by controlling pressure.
When the low-temperature flue gas of 120-180 DEG C be directly entered desulfurizer carry out desulfurization time, substantial amounts of cooling water can be consumed, power consumption also accordingly increases simultaneously, and the increase of desulfurization blower fan load can be caused, at desulfurizer entrance, GGH is set, reduce the temperature of former flue gas, on the one hand decrease consumption and the power consumption of water in desulfurizing tower, also reduce the power consumption of desulfurization blower fan simultaneously;Desulfurizer outlet arranges GGH, improves the desulfuration efficiency of desulfurizer, reduces the energy consumption (injection flow rate and power load) of desulfurizer simultaneously.
Preferably, described tapping equipment also include the cold end of MGGH, described MGGH between GGH and composite phase-change heat-exchanger rig condensation end, described MGGH hot junction is between composite phase-change heat-exchanger rig evaporation ends and chimney.
nullThe cold end of MGGH is between described GGH and described composite phase-change heat-exchanger rig condensation end,Neat stress after GGH preheats enters the cold end of MGGH to be continued to heat up,In the cold end of MGGH, the heat of thermal medium passes to flue gas by heat exchanger tube,Flue gas is heated up,Thermal medium temperature reduces,Flue gas after intensification continues through composite phase-change heat-exchanger rig condensation end and heats up,Then the high-temperature flue gas with burner outlet mixes and heats up,Denitration is carried out subsequently into denitrification apparatus,MGGH hot junction is between composite phase-change heat-exchanger rig evaporation ends and chimney,Flue gas after denitration initially enters the evaporation ends of composite phase-change heat-exchanger rig and lowers the temperature,Cooling is continued subsequently into MGGH hot junction,Then through smoke stack emission,Thermal medium in MGGH hot junction absorbs the heat of the high-temperature flue gas after denitration by heat exchanger tube,Make flue gas cool-down,Thermal medium temperature rises,The cold end of MGGH and MGGH hot junction are connected by circulation line,Thermal medium after heating up in MGGH hot junction arrives the cold end of MGGH through circulation line,Heat up for flue gas and heat is provided,Thermal medium after cooling returns to MGGH hot junction by circulation line,Continue to absorb the heat of high-temperature flue gas after denitration and heat up,Arrive the cold end of MGGH again,So circulation,The circulating pump cycled through on circulation line of the thermal medium between the cold end of MGGH and MGGH hot junction realizes,Circulating pump provides pressure head for thermal medium,Described thermal medium can be water、Conduction oil etc..
In desulfurizer outlet, MGGH and composite phase-change heat-exchanger rig are set, utilize the flue gas before the heat denitration of the flue gas after denitration, with simple by fuel, the cigarette temperature in 50-60 DEG C of desulfurizer exit is directly heated up compared with, decrease the consumption of fuel, by heat Appropriate application, economy is high.
Low temperature part uses MGGH, high-temperature part uses composite phase-change heat-exchanger rig, avoid use single water heat medium MGGH it is possible that superpressure, the accident such as booster, in operation safer, and composite phase-change heat-exchanger rig make use of the flow process of flue gas on arranging, along the trend of flue, is respectively arranged heat transmission equipment, control system is relatively easy, and cost is low.
Preferably, the cold end of described MGGH and the circulation line in hot junction connect there is the expansion tank for providing thermal medium.Described expansion tank can provide thermal medium when system initiates, and can play replenishment system thermal medium, provide pressure head and absorb the effect expanded.
Preferably, the circulation line in the described connection cold end of MGGH and hot junction is provided with circulating pump, and the exit of described circulating pump is provided with circulating-pump outlet regulation valve.Described circulating-pump outlet regulates the valve flue-gas temperature with the gas outlet of the cold end of MGGH as signal, when the flue-gas temperature of the gas outlet of the cold end of described MGGH is low, the aperture that circulating-pump outlet regulates valve increases, the thermal medium of circulation between the cold end of described MGGH and MGGH hot junction is made to increase, more thermal mediums are provided, to improve the cold flue-gas temperature bringing out QI KOU of MGGH for the cold end of described MGGH.
Concrete, controller can be set on described circulating-pump outlet regulation valve, described MGGH cold bringing out, temperature sensor is set at QI KOU, cold for the MGGH the detected flue-gas temperature bringing out QI KOU is sent to controller by temperature sensor, temperature threshold is pre-set in controller, when the temperature received is less than temperature threshold, circulating-pump outlet is regulated the aperture of valve and increases by controller.
Preferably, being connected and have pipeline between outlet and the entrance of the thermal medium in described MGGH hot junction, described pipeline is provided with MGGH hot junction thermal medium bypass valve.Described MGGH hot junction thermal medium bypass valve is using the temperature of the thermal medium at circulating-pump outlet as regulation signal, the aperture of control valve when the temperature of thermal medium is low, the high-temperature hot medium in exit, MGGH hot junction is returned a part of entrance to MGGH hot junction, to regulate medium temperature, thus reach to control the purpose of heat exchange tube wall temperature, heat exchange tube wall temperature is controlled on dew point corrosion temperature.
Concrete, controller can be set on described MGGH hot junction thermal medium bypass valve, in the exit of described circulating pump, temperature sensor is set, the temperature of the thermal medium in the exit of the circulating pump detected is sent to controller by temperature sensor, the temperature threshold of thermal medium is pre-set in controller, when the temperature received is less than the temperature threshold arranged, regulation MGGH hot junction thermal medium bypass valve, returns to by the high-temperature hot medium in the exit, hot junction of MGGH to a part of thermal medium porch to MGGH hot junction.
Preferably, described tapping equipment also includes steam-flue gas heater, described steam-flue gas heater is between described GGH and the cold end of described MGGH, the air inlet of described steam-flue gas heater connects the gas outlet of the cold side of described GGH, and the gas outlet of described steam-flue gas heater connects the air inlet of the cold end of described MGGH.
Neat stress arrival steam-flue gas heater after GGH preheats after desulfurization completes carries out homoiothermic, continue to heat up subsequently into the cold end of MGGH, before the cold end of MGGH, steam-flue gas heat-exchange unit is set, the flue-gas temperature of entrance MGGH is regulated by arranging steam-flue gas heat-exchange unit, the temperature making entrance MGGH controls in the range of 70-80 DEG C, by controlling to enter the temperature of MGGH, thus reduce the dew point corrosion of heat exchanger tube..
Described steam-flue gas heat-exchange unit is provided with air intake and outlet, air intake is passed through saturated vapor, transfer heat to enter the flue gas of described steam-flue gas heater after steam-flue gas heater described in steam entrance, flue gas is heated up, and flows out by outlet with the form of condensation water after steam cooling.
nullConcrete,Time properly functioning,The low-temperature flue gas of 120-180 DEG C first passes through GGH and lowers the temperature and preheat from desulfurizer low temperature neat stress out,It is heated to neat stress when 70-80 DEG C entering steam-flue gas heater,The cold end of MGGH is entered by steam-flue gas heater homoiothermic,Flue-gas temperature is warming up to 150-170 DEG C,Enter composite phase-change heat-exchanger rig condensation end,Flue gas is warming up to 260-280 DEG C,Flue gas after burning with burner mixes,During by temperature mixing to 320-350 DEG C,Enter denitrification apparatus and carry out denitration,Flue gas after denitration has certain temperature drop,Temperature is down to when 300-320 DEG C enter composite phase-change heat-exchanger rig evaporation ends,When being cooled to 220-230 DEG C further,Enter MGGH hot junction,When being cooled to 130-150 DEG C,Discharged by chimney.
From above technical scheme, the desulphurization denitration exhaust system of the low temperature waste gas that the embodiment of the present invention provides has the advantages that
(1) GGH is set at desulfurizer entrance, reduces the temperature of former flue gas, on the one hand decrease consumption and the power consumption of water in desulfurizing tower, also reduce the power consumption of desulfurization blower fan simultaneously;
(2) arranging MGGH and composite phase-change heat-exchanger rig for heating up denitrification apparatus compared with the simple direct intensification of cigarette temperature that desulfurizer is exported 50-60 DEG C by fuel in desulfurizer outlet, denitrification apparatus decreases the consumption of fuel;
(3) low temperature part uses MGGH, high-temperature part uses composite phase-change heat-exchanger rig, avoid use single water heat medium MGGH it is possible that superpressure, the accident such as booster, in operation safer, and composite phase-change heat-exchanger rig make use of the flow process of flue gas on arranging, control system is relatively easy, and cost is low;
(4) flue-gas temperature of entrance MGGH is regulated by arranging steam-flue gas heat-exchange unit, the temperature making entrance MGGH controls in certain scope, and uses steam-flue gas heat-exchange unit to carry out homoiothermic, compared with other mode of heating (electrical heating), heat exchange area is little, and cost is low.
Accompanying drawing explanation
For the clearer explanation embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, obviously, to those skilled in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the desulphurization denitration clean emission device of a kind of low temperature waste gas that the embodiment of the present invention provides.
In figure: 1-desulfurizer, 2-GGH, 3-steam-flue gas heater, the cold end of 4-MGGH, 5-composite phase-change heat-exchanger rig condensation end, 6-burner, 7-denitrification apparatus, 8-composite phase-change heat-exchanger rig evaporation ends, 9-MGGH hot junction, 10-chimney, 11-drum, 12-circulating pump, 13-circulating-pump outlet regulation valve, 14-MGGH hot junction thermal medium bypass valve, 15-expansion tank.
Detailed description of the invention
For the technical scheme making those skilled in the art be more fully understood that in the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those skilled in the art are obtained under not making creative work premise, all should belong to protection scope of the present invention.
nullSee accompanying drawing 1,The structural representation of desulphurization denitration clean emission device for a kind of low temperature waste gas that the embodiment of the present invention provides,As shown in Figure 1,Described tapping equipment includes desulfurizer 1、GGH2、Steam-flue gas heater 3、MGGH、Composite phase-change heat-exchanger rig、Burner 6、Denitrification apparatus 7 and chimney 10,Described GGH2 is between described desulfurizer 1 and described steam-flue gas heater 3,The hot side-inlet of described GGH2 accesses former flue gas,The gas outlet, hot side of described GGH2 connects the air inlet of described desulfurizer 1,The gas outlet of described desulfurizer 1 connects the cold side-inlet of GGH2,The gas outlet, cold side of GGH2 connects described steam-flue gas heater 3,Described steam-flue gas heater 3、The cold end of MGGH 4、Composite phase-change heat-exchanger rig condensation end 5、Burner 6、Denitrification apparatus 7、Composite phase-change heat-exchanger rig evaporation ends 8、MGGH hot junction 9 and chimney 10 are sequentially connected with by pipeline,In the present embodiment,It is additionally provided with air intake and outlet on described steam-flue gas heater 3,Described air intake is used for being passed through saturated vapor,Transfer heat to enter the flue gas of described steam-flue gas heater 3 after steam-flue gas heater 3 described in saturated vapor entrance,Flue gas is heated up,Flow out by outlet with the form of condensation water after steam cooling.Described composite phase-change heat-exchanger rig includes composite phase-change heat-exchanger rig condensation end 5, composite phase-change heat-exchanger rig evaporation ends 8, drum 11 and control pressurer system, connect drum by pipeline between described composite phase-change heat-exchanger rig evaporation ends and composite phase-change heat-exchanger rig condensation end, between described composite phase-change heat-exchanger rig evaporation ends and composite phase-change heat-exchanger rig condensation end, form circulation by drum.
Time properly functioning, low-temperature flue gas first passes through GGH2 and lowers the temperature and preheat from desulfurizer 1 low temperature neat stress out, steam-flue gas heater 3 is entered after being heated by neat stress, heat up by entering the cold end of MGGH 4 after steam-flue gas heater 3 homoiothermic, continue to heat up subsequently into composite phase-change heat-exchanger rig condensation end 5, flue gas after burning with burner 6 afterwards mixes, enter denitrification apparatus 7 after reaching the operating temperature of denitrification apparatus 7 and carry out denitration, flue gas after denitration has certain temperature drop, enter composite phase-change heat-exchanger rig evaporation ends 8 after temperature drop and continue cooling, when being cooled to can drain into air further subsequently into MGGH hot junction 9, discharged by chimney 10.
In the present embodiment, the thermal medium of described MGGH is water, connect on the circulation line in the cold end of described MGGH 4 and described MGGH hot junction 9 and have the expansion tank 15 for providing recirculated water, the circulation line in the cold end of described MGGH 4 and described MGGH hot junction 9 is provided with circulating pump 12, circulating-pump outlet regulation valve 13 it is provided with in the exit of described circulating pump 12, being connected between outlet and the entrance of the thermal medium in described MGGH hot junction 9 and have pipeline, described pipeline is provided with MGGH hot junction thermal medium bypass valve 14.
It is provided with controller on described circulating-pump outlet regulation valve 13, it is provided with temperature sensor at described MGGH cold end 4 gas outlet, described circulating-pump outlet regulates the valve 13 flue-gas temperature with the gas outlet of the cold end of MGGH 4 as signal, the flue-gas temperature of the gas outlet of cold for the MGGH detected end 4 is sent to controller by temperature sensor, temperature threshold is pre-set in controller, when the temperature received is less than temperature threshold, the aperture that circulating-pump outlet regulates valve increases.Make the recirculated water of circulation between the cold end of described MGGH 4 and MGGH hot junction 9 increase, provide more recirculated water for the cold end of described MGGH 4, to improve the flue-gas temperature of MGGH cold end 4 gas outlet.
It is provided with controller on described MGGH hot junction thermal medium bypass valve 14, in the exit of described circulating pump 12, temperature sensor is set, described MGGH hot junction thermal medium bypass valve 14 is using the temperature of the water in the exit of circulating pump 12 as regulation signal, the temperature of the water in the exit of the circulating pump 12 detected is sent to controller by temperature sensor, the temperature threshold of thermal medium is pre-set in controller, when the temperature received is less than the temperature threshold arranged, regulation MGGH hot junction thermal medium bypass valve 14, the high-temperature water in the exit, hot junction 9 of MGGH is returned a part of porch to MGGH hot junction 9, to regulate the temperature of water, thus reach to control the purpose of the heat exchange tube wall temperature in MGGH hot junction 9.
Above, only presently preferred embodiments of the present invention, but protection scope of the present invention is not limited thereto, can be to be the heater of other forms for the register before entering MGGH, such as electrical heating or other thermal fluid heater;As system uses middle temperature denitration, then can be only with MGGH system, the flue gas after MGGH heating is without entering denitrification apparatus through heating facility again;MGGH uses water, conduction oil or other heat transferring mediums as thermal medium.To any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim is defined.

Claims (5)

1. the desulphurization denitration clean emission device of a low temperature waste gas, including the desulfurizer being sequentially connected with by pipeline, burner, denitrification apparatus and chimney, it is characterized in that, described tapping equipment also includes GGH and composite phase-change heat-exchanger rig, it is connected with GGH and composite phase-change heat-exchanger rig condensation end in turn by pipeline between described desulfurizer and burner, connected by pipeline between described denitrification apparatus and chimney and have composite phase-change heat-exchanger rig evaporation ends, the hot side air intake of described GGH connects gas, the gas outlet, hot side of GGH is connected with the air inlet of desulfurizer, the air intake of cold side of GGH is connected with the gas outlet of desulfurizer.
The desulphurization denitration clean emission device of low temperature waste gas the most according to claim 1, it is characterized in that, described tapping equipment also includes MGGH, the cold end of described MGGH is between GGH and composite phase-change heat-exchanger rig condensation end, and described MGGH hot junction is between composite phase-change heat-exchanger rig evaporation ends and chimney.
The desulphurization denitration clean emission device of low temperature waste gas the most according to claim 2, it is characterised in that the cold end of described connection MGGH and the circulation line in hot junction are provided with circulating pump, the exit of described circulating pump is provided with circulating-pump outlet regulation valve.
The desulphurization denitration clean emission device of low temperature waste gas the most according to claim 2, it is characterised in that being connected between outlet and the entrance of the thermal medium in described MGGH hot junction and have pipeline, pipeline is provided with MGGH hot junction thermal medium bypass valve.
5. according to the desulphurization denitration clean emission device of the low temperature waste gas described in any one of claim 2-4, it is characterised in that described tapping equipment also includes steam-flue gas heater, and described steam-flue gas heater is between described GGH and the cold end of described MGGH.
CN201610295101.5A 2016-05-06 2016-05-06 The desulphurization denitration clean emission device of low temperature waste gas CN105841176B (en)

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