CN205560807U - Low temperature exhaust gas's SOx/NOx control clean release system - Google Patents
Low temperature exhaust gas's SOx/NOx control clean release system Download PDFInfo
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- CN205560807U CN205560807U CN201620402767.1U CN201620402767U CN205560807U CN 205560807 U CN205560807 U CN 205560807U CN 201620402767 U CN201620402767 U CN 201620402767U CN 205560807 U CN205560807 U CN 205560807U
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Abstract
The utility model relates to a does fume emission technical field especially relate to the higher low temperature (120 of SO2 and NOX content 180 DEG C) the SOx/NOx control clean release system of waste gas. The utility model provides a low temperature exhaust gas's SOx/NOx control clean release system includes the desulphurization unit, burner, denitrification facility and the chimney that connect gradually through the pipeline, GGH's heat side is gone into the gas port and is connected gas, and GGH's heat side gas outlet is connected with desulphurization unit's air inlet, and the entry of GGH's cold side is connected with desulphurization unit's gas outlet. The utility model discloses set up GGH in the desulphurization unit entrance, reduce original flue gas's temperature, reduced the consumption and the power consumption of desulfurizing tower water -logging on the one hand, also reduced the power consumption of desulfurization fan simultaneously, adopt MGGH to utilize the heat of the flue gas after the denitration to add the flue gas before the thermal denitration, pass through fuel with desulphurization unit export 50 with single 60 DEG C direct intensification of gas temperature compare, reduced the consumption of fuel.
Description
Technical field
This utility model relates to fume emission technical field, particularly relates to SO2And NOXThe desulphurization denitration clean exhaust system 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
The purpose of this utility model is, overcomes the deficiencies in the prior art, it is provided that the desulphurization denitration clean exhaust system of a kind of low temperature waste gas, solves less economical problem, ensures system stability safe operation simultaneously.
For solving above-mentioned technical problem, the technical solution of the utility model is: provide the desulphurization denitration clean exhaust system of a kind of low temperature waste gas, including the desulfurizer being sequentially connected with by pipeline, burner, denitrification apparatus and chimney, it is connected with the cold end of GGH and MGGH in turn by pipeline between described desulfurizer and burner, connected by pipeline between described denitrification apparatus and chimney and have MGGH hot junction, 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，Low temperature neat stress can be preheated to 70-80 DEG C，The low temperature neat stress that desulfurization completes enters the cold end of MGGH 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 hot junction of the gas entrance MGGH after denitration is discharged after lowering the temperature.
The flue gas of 120-180 DEG C is directly entered desulfurizer, 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.
By arranging MGGH, utilize the flue gas before the heat denitration of the flue gas after denitration, directly heat up with the single cigarette temperature that by fuel, desulfurizer is exported 50-60 DEG C compared with, decrease the consumption of fuel.
Preferably, described MGGH includes water heat medium MGGH and oil heating agent MGGH, it is sequentially connected with the cold end of water heat medium MGGH and the oil cold end of heating agent MGGH by pipeline between described GGH and burner, between described denitrification apparatus and chimney, is sequentially connected with oil heating agent MGGH hot junction and water heat medium MGGH hot junction by pipeline.
Low temperature neat stress after preheating in GGH enters the cold end of described water heat medium MGGH and heats up, by water heat medium MGGH cold bring out QI KOU enter the most afterwards oil the cold end of heating agent MGGH proceed heat 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, flue gas after denitration has certain temperature drop, enter oil heating agent MGGH hot junction when temperature is down to 300-320 DEG C to lower the temperature, when being cooled to 220-230 DEG C further, enter water heat medium MGGH hot junction and continue cooling, discharged by chimney after being cooled to 130-150 DEG C.
It is provided with circulation line between cold end and the hot junction of water heat medium MGGH, the outlet of water self-loopa water pump is out, hot junction is entered by circulation line, high-temperature gas after denitration from hot junction through after, transfer heat to the water in hot junction, after water intensification in hot junction from the outlet in hot junction out, cold end is entered through circulation line, in GGH, the gas cold end of entrance after preheating heats up, water in cold end transfers heat to gas, returned to hot junction by the outlet of cold end through circulation line after water temperature drop heat up, so circulation, the oil cold end of heating agent MGGH is identical with water heat medium MGGH with the heat transfer mode in hot junction, it is not repeated herein.
This utility model arranges water heat medium MGGH and oil heating agent MGGH simultaneously, adopt at low-temperature region and use water as circulatory mediator, high-temperature area uses oil as circulatory mediator, with be used alone water as compared with circulatory mediator, there is broader temperature applicable range, use safer, avoid and use water as circulatory mediator at high-temperature area, cause water vapor, the pressure super high pressure accident caused, runs safer.
Preferably, on the circulation line in the described cold end of water heat medium MGGH and water heat medium MGGH hot junction, connection has cyclic water tank.Cyclic water tank connects water source, provides recirculated water when system just starts for water heat medium MGGH, is used as cyclic water tank, plays the effect of steady of system press simultaneously under some require supplementation with the state of emergency of recirculated water.
Preferably, the circulation line in the described connection cold end of water heat medium MGGH and water heat medium MGGH hot junction is provided with water circulating pump, and the water outlet of water circulating pump is provided with water circulating pump outlet regulating valve.
Described water circulating pump outlet regulating valve is with the flue-gas temperature of the gas outlet of the cold end of MGGH as signal, when water heat medium MGGH is cold bring out the flue-gas temperature of QI KOU low time, the aperture of described water circulating pump outlet regulating valve is increased, increases quantity of circulating water, to improve the cold flue-gas temperature bringing out QI KOU of water heat medium MGGH.
Concrete, controller can be set on described water circulating pump outlet regulating valve, in the described water heat medium MGGH cold QI KOU that brings out, temperature sensor is set, the cold flue-gas temperature bringing out QI KOU detected 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 of water circulating pump outlet regulating valve is increased.
Preferably, between the hot junction outlet of described water heat medium MGGH and water inlet, connection has pipeline, described connection pipeline to be provided with water heat medium MGGH hot junction bypass valve.Described water heat medium MGGH hot junction bypass valve is using the temperature of the water in water circulating pump exit as regulation signal, when the water temperature of water circulating pump outlet is low, regulate described bypass valve, the high-temperature water of the hot junction water outlet of water heat medium MGGH is returned a part of hot junction water inlet to water heat medium MGGH, to regulate the temperature of water, thus reach to control the purpose of the heat exchange tube wall temperature in water heat medium MGGH hot junction.
Concrete, controller can be set on described bypass valve, water outlet at described water circulating pump arranges temperature sensor, the temperature of the outlet of the water circulating pump detected is sent to controller by temperature sensor, temperature threshold is pre-set in controller, when the temperature received is less than temperature threshold, regulate described bypass valve, the high-temperature water of the hot junction water outlet of water heat medium MGGH is returned a part of hot junction water inlet to water heat medium MGGH.
Preferably, on the circulation line in the described oil cold end of heating agent MGGH and oil heating agent MGGH hot junction, connection has top petrol tank.Top petrol tank connects oil sources, provides oil when system just starts for oil heating agent MGGH, is used as top petrol tank, plays the effect of steady of system press simultaneously under the state of emergency requiring supplementation with conduction oil.
Preferably, the described circulation line connecting the oil cold end of heating agent MGGH and oil heating agent MGGH hot junction is provided with oil circulating pump, is provided with oil circulating pump outlet regulating valve at the oil-out of oil circulating pump.
Described oil circulating pump outlet regulating valve is with the oil cold flue-gas temperature brought out at QI KOU of heating agent MGGH for regulation signal, when the cold flue-gas temperature bringing out QI KOU of oil heating agent MGGH is low, the aperture of described oil circulating pump outlet regulating valve can be increased, increase circulation oil mass, to improve the oil cold flue-gas temperature bringing out QI KOU of heating agent MGGH.
Concrete, controller can be set on described oil circulating pump outlet regulating valve, in the described oil heating agent MGGH cold QI KOU that brings out, temperature sensor is set, the cold flue-gas temperature bringing out QI KOU detected 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 of oil circulating pump outlet regulating valve is increased.
Preferably, connect between the described oil hot junction oil-out of heating agent MGGH and oil-in and have pipeline, described connection pipeline to be provided with oil heating agent MGGH hot junction bypass valve.Described oil heating agent MGGH hot junction bypass valve is using the temperature of the oil of described oil circulating pump oil-out as regulation signal, when the oil temperature of oil circulating pump oil-out is low, regulate the aperture of described bypass valve, high temperature oil at the hot junction oil-out of oil heating agent MGGH is returned the hot junction oiler of a part extremely oil heating agent MGGH, with the temperature of regulation oil, thus reach to control the purpose of heat exchange tube wall temperature.Control the tube wall temperature of heat exchanger tube on dew point corrosion temperature.
Concrete, controller can be set on described bypass valve, at the oil-out of described oil circulating pump, temperature sensor is set, the temperature of the oil-out of the oil circulating pump detected 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 of bypass valve is increased so that the high temperature oil at the hot junction oil-out of oil heating agent MGGH returns a part of hot junction oiler to oil heating agent MGGH.
Preferably, described exhaust system also includes steam-flue gas heater, described steam-flue gas heater is between described GGH and the described cold end of water heat medium MGGH, the air inlet of described steam-flue gas heater connects the gas outlet, cold side of described GGH, and the gas outlet of described steam-flue gas heater connects the air inlet of the described cold end of water heat medium MGGH.
nullConcrete，When normally working，The low-temperature flue gas of 120-180 DEG C first passes around GGH and lowers the temperature and preheat from desulfurizer low temperature neat stress out，It is heated to low temperature neat stress when 70-80 DEG C entering steam-flue gas heater，The cold end of water heat medium MGGH is entered after steam-flue gas heater homoiothermic，Flue-gas temperature is warming up to 150-170 DEG C，Enter the oil cold end of heating agent MGGH，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 oil heating agent MGGH hot junction，When being cooled to 220-230 DEG C further，Enter water heat medium MGGH hot junction，When being cooled to 130-150 DEG C，Discharge.
Described steam-flue gas heat-exchange unit is provided with air intake and outlet, air intake is passed through the saturated vapor of 0.4-0.6MPa, 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.
Regulate the flue-gas temperature of entrance MGGH by arranging steam-flue gas heat-exchange unit, make the temperature of entrance MGGH control at 70-80 DEG C, to reduce the likelihood of corrosion of heat exchanger tube.Using steam-flue gas heat-exchange unit to carry out homoiothermic, compared with other mode of heating (electrical heating), heat exchange area is little, relatively simple in the acquisition of medium, and steam heat-exchanging is dynamic heat exchange simultaneously, it is not necessary to increasing power-equipment, overall cost is low.
From above technical scheme, the desulphurization denitration exhaust system of the low temperature waste gas that this utility model embodiment provides has the advantage that
(1) GGH is set in desulfurizer porch, 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) utilize the flue gas before the heat denitration of the flue gas after denitration by arranging MGGH, directly heat up with the single cigarette temperature that by fuel, desulfurizer is exported 50-60 DEG C compared with, decrease the consumption of fuel；
(3) low temperature part uses the MGGH of water heat medium, and high-temperature part uses the MGGH of oil heating agent, it is to avoid the MGGH of the water heat medium that employing is single it is possible that superpressure, the accident such as booster, safer in operation；
(4) regulate the flue-gas temperature of entrance MGGH by arranging steam-flue gas heat-exchange unit, make the temperature of entrance MGGH control in certain scope.Using steam-flue gas heat-exchange unit to carry out homoiothermic, compared with other mode of heating (electrical heating), heat exchange area is little, relatively simple in the acquisition of medium, and steam heat-exchanging is dynamic heat exchange simultaneously, it is not necessary to increasing power-equipment, overall cost is low.
Accompanying drawing explanation
For clearer explanation this utility model embodiment 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 exhaust system of a kind of low temperature waste gas that this utility model embodiment provides.
In figure: 1-desulfurizer,
2-GGH, 3-steam-flue gas heater, the cold end of 4-water heat medium MGGH, the 5-oil cold end of heating agent MGGH, 6-burner, 7-denitrification apparatus, 8-oil heating agent MGGH hot junction, 9-water heat medium MGGH hot junction, 10-chimney, 11-cyclic water tank, 12-water circulating pump, 13-top petrol tank, 14-oil circulating pump, 15-water circulating pump outlet regulating valve, 16-oil circulating pump outlet regulating valve, 17-oil heating agent MGGH hot junction bypass valve, 18-water heat medium MGGH hot junction bypass valve.
Detailed description of the invention
For the technical scheme making those skilled in the art be more fully understood that in this utility model, below in conjunction with the accompanying drawing in this utility model embodiment, technical scheme in this utility model embodiment is clearly and completely described, obviously, described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those skilled in the art are obtained under not making creative work premise, all should belong to protection domain of the present utility model.
nullSee accompanying drawing 1，The structural representation of desulphurization denitration exhaust system for a kind of low temperature waste gas that this utility model embodiment provides，As shown in Figure 1，Described exhaust system includes desulfurizer 1、GGH2、Steam-flue gas heater 3、Water heat medium MGGH、Oil heating agent MGGH、Burner 6、Denitrification apparatus 7 and chimney 10，The air intake connection flue gas source, hot side of described GGH2，The low-temperature flue gas of 120-180 DEG C initially enters described GGH2 and lowers the temperature，The gas outlet, hot side of described GGH2 connects the air inlet of described desulfurizer 1，Flue gas after cooling enters desulfurizer 1 and carries out desulfurization，The gas outlet of described desulfurizer connects the cold side air intake of described GGH2，The gas outlet, cold side of described GGH2 connects described steam-flue gas heater 3，Flue gas after desulfurization returns in GGH2 and preheats，Neat stress after desulfurization is heated by the heat utilizing the former flue gas entered in GGH2，Reach former flue gas cool-down and the purpose of neat stress intensification，Flue gas after preheating enters steam-flue gas heater 3 and proceeds to heat up，Steam-flue gas heater 3 is provided with air intake and outlet，Air intake is passed through steam，Utilize steam that the flue gas entered in steam-flue gas heater 3 is heated，Steam cooling after heating，Discharge by outlet with the form of condensation water，Flue gas is heated up，The gas outlet of described steam-flue gas heater 3 connects the air inlet of the described cold end of water heat medium MGGH 4，The gas outlet of the described cold end of water heat medium MGGH 4 connects the air inlet of the described oil cold end of heating agent MGGH 5，Flue gas after steam-flue gas heater 3 heats enters water heat medium MGGH cold end 4 and continues heating，Enter oil heating agent MGGH cold end 5 after heating and continue heating，The gas outlet of the described oil cold end of heating agent MGGH 5 connects described burner 6，Described burner 6 is provided with blast furnace gas entrance，Described burner 6 connects described denitrification apparatus 7，High-temperature flue gas after flue gas after oil heating agent MGGH cold end 5 heating burns with burner 6 mixes，Enter denitrification apparatus 7 when reaching denitration temperature and carry out denitration，The gas outlet of described denitrification apparatus connects the air inlet in described oil heating agent MGGH hot junction 8，The gas outlet in described oil heating agent MGGH hot junction 8 connects the air inlet in described water heat medium MGGH hot junction 9，Flue gas after denitrification apparatus 7 denitration sequentially enters oil hot junction 9, heating agent MGGH hot junction 8 and water heat medium MGGH and lowers the temperature，The gas outlet in described water heat medium MGGH hot junction 9 connects described chimney 10，Flue gas after water heat medium MGGH hot junction 9 lowers the temperature discharges through chimney 10.
nullConnected by circulation line between the described cold end of water heat medium MGGH 4 and water heat medium MGGH hot junction 9，Circulation line is provided with water circulating pump 12 and cyclic water tank 11，Cyclic water tank 11 connects water source，Recirculated water is provided for water heat medium MGGH when system just starts，The outlet of water circulating pump 12 connects the water inlet in water heat medium MGGH hot junction 9 by circulation line，The outlet in water heat medium MGGH hot junction 9 connects the water inlet of the cold end of water heat medium MGGH 4 by circulation line，The outlet of the cold end of water heat medium MGGH 4 connects the water inlet of water circulating pump 12 by circulation line，Flue gas after the cooling of oil heating agent MGGH hot junction 8 goes successively to discharge after water heat medium MGGH hot junction 9 lowers the temperature，High-temperature gas after denitration from water heat medium MGGH hot junction 9 through later，Transfer heat to the water in water heat medium MGGH hot junction 9，After water intensification in water heat medium MGGH hot junction 9, the outlet from water heat medium MGGH hot junction 9 is out，The cold end of water heat medium MGGH 4 is entered through circulation line，In GGH2, the gas entrance cold end of water heat medium MGGH 4 after preheating heats up，Water in the cold end of water heat medium MGGH 4 transfers heat to gas，Entered the water inlet of water circulating pump 12 through circulation line by the outlet of the cold end of water heat medium MGGH 4 after water temperature drop，Outlet through water circulating pump 12 outflows back to water heat medium MGGH hot junction 9 and heats up again，So circulation，Utilize the flue gas before the heat denitration of the flue gas after denitration，Compared with directly heating up with single cigarette temperature desulfurizer exported by fuel，Decrease the consumption of fuel.
nullConnected by circulation line between the described oil cold end of heating agent MGGH 5 and oil heating agent MGGH hot junction 8，Circulation line is provided with oil circulating pump 14 and top petrol tank 13，Top petrol tank 13 connects oil sources，Recycle oil is provided for oil heating agent MGGH when system just starts，The oil-out of oil circulating pump 14 connects the oil-in in oil heating agent MGGH hot junction 8 by circulation line，The oil-out in oil heating agent MGGH hot junction 8 connects the oil-in of the oil cold end of heating agent MGGH 5 by circulation line，The oil-out of the oil cold end of heating agent MGGH 5 connects the oil-in of oil circulating pump 14 by circulation line，Gas after denitration enters after oil heating agent MGGH hot junction 8 lowers the temperature and enters follow-up system，High-temperature gas after denitration oil heating agent MGGH hot junction 8 certainly is through later，Transfer heat to the oil in oil heating agent MGGH hot junction 8，After oil intensification in oil heating agent MGGH hot junction 8, the oil-out from oil heating agent MGGH hot junction 8 is out，The oil cold end of heating agent MGGH 5 is entered through circulation line，Gas after water heat medium MGGH cold end 4 heats enters the oil cold end of heating agent MGGH 5 and proceeds to heat up，Oil in the oil cold end of heating agent MGGH 5 transfers heat to gas，Entered the oil-in of oil circulating pump 14 through circulation line by the oil-out of the oil cold end of heating agent MGGH 5 after oil temperature decline，Again the oil-out through oil circulating pump 14 outflow back to oil heating agent MGGH hot junction 8 heat up，So circulation，Utilize the flue gas before the heat denitration of the flue gas after denitration，Compared with directly heating up with single cigarette temperature desulfurizer exported by fuel，Decrease the consumption of fuel；And adopt at low-temperature region and to use water as circulatory mediator, high-temperature area uses conduction oil as circulatory mediator, with be used alone water as compared with circulatory mediator, there is broader temperature applicable range, use safer, avoid and use water as circulatory mediator at high-temperature area, cause water vapor, the pressure super high pressure accident caused.
In the present embodiment, water outlet at described water circulating pump 12 is provided with water circulating pump outlet regulating valve 15, the exit of oil circulating pump 14 is provided with oil circulating pump outlet regulating valve 16, when the flue-gas temperature of the cold end of water heat medium MGGH 4 and/or the gas outlet of the oil cold end of heating agent MGGH 5 is low, the exit that can regulate described water circulating pump 12 outlet regulating valve 15 and/or oil circulating pump 14 is provided with the aperture of oil circulating pump outlet regulating valve 16, to increase quantity of circulating water and circulation oil mass, improve the cold end of water heat medium MGGH 4 and/or the flue-gas temperature of oil heating agent MGGH cold end 5 gas outlet.
Concrete, the present embodiment arranges controller on described water circulating pump outlet regulating valve 15 and/or oil circulating pump outlet regulating valve 16, in the gas outlet of the described cold end of water heat medium MGGH 4 and/or the oil cold end of heating agent MGGH 5, temperature sensor is set, the flue-gas temperature detected 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 of water circulating pump outlet regulating valve 15 and/or oil circulating pump outlet regulating valve 16 is increased.
In the present embodiment, it is provided with connection pipeline between described water heat medium MGGH hot junction 9 and outlet and water inlet, connect pipeline and be provided with water heat medium MGGH hot junction bypass valve 18, it is provided with connection pipeline between oil-out and the oil-in in described oil heating agent MGGH hot junction 8, connects pipeline and be provided with oil heating agent MGGH hot junction bypass valve 17.
When the water temperature of the outlet of water circulating pump 12 is low, the aperture of described water heat medium MGGH hot junction bypass valve 18 can be regulated, the high-temperature water of the water outlet in water heat medium MGGH hot junction 9 is returned a part of water inlet to water heat medium MGGH hot junction 9, to regulate the temperature of water, thus reach to control the purpose of heat exchange tube wall temperature；When the oil temperature of the oil-out of oil circulating pump 14 is low, the aperture of described oil heating agent MGGH hot junction bypass valve 17 can be regulated, high temperature oil at the oil-out in oil heating agent MGGH hot junction 8 is returned the oiler in a part extremely oil heating agent MGGH hot junction 8, temperature with regulation oil, thus reach to control the purpose of heat exchange tube wall temperature, in order to the tube wall temperature of heat exchanger tube is controlled on dew point corrosion temperature.
Concrete, the present embodiment arranges controller on described water heat medium MGGH hot junction bypass valve 18, water outlet at described water circulating pump 12 arranges temperature sensor, the temperature of the outlet of the water circulating pump 12 detected 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 of described water heat medium MGGH hot junction bypass valve 18 is increased so that the high-temperature water of the water outlet in water heat medium MGGH hot junction 9 returns a part of water inlet to water heat medium MGGH hot junction 9.Also making same setting on described oil heating agent MGGH, here is omitted.
Above, preferred embodiment the most of the present utility model, but protection domain of the present utility model 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 the flue gas after MGGH heating is without entering denitrification apparatus etc. through heating facility again；For a person skilled in the art, on the premise of without departing from this utility model principle, it is also possible to make some improvements and modifications, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (7)
1. the desulphurization denitration clean exhaust system 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, it is connected with the cold end of GGH and MGGH in turn by pipeline between described desulfurizer and burner, MGGH hot junction is connected 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, and the cold side air intake of GGH is connected with the gas outlet of desulfurizer.
The desulphurization denitration clean exhaust system of low temperature waste gas the most according to claim 1, it is characterized in that, described MGGH includes water heat medium MGGH and oil heating agent MGGH, it is sequentially connected with the cold end of water heat medium MGGH and the oil cold end of heating agent MGGH by pipeline between described GGH and burner, between described denitrification apparatus and chimney, is sequentially connected with oil heating agent MGGH hot junction and water heat medium MGGH hot junction by pipeline.
The desulphurization denitration clean exhaust system of low temperature waste gas the most according to claim 1, it is characterised in that connect between the outlet in described water heat medium MGGH hot junction and water inlet and have pipeline, connects pipeline and is provided with water heat medium MGGH hot junction bypass valve.
The desulphurization denitration clean exhaust system of low temperature waste gas the most according to claim 1, it is characterised in that connect between the oil-out in described oil heating agent MGGH hot junction and oil-in and have pipeline, connects pipeline and is provided with oil heating agent MGGH hot junction bypass valve.
The desulphurization denitration clean exhaust system of low temperature waste gas the most according to claim 1, it is characterized in that, the described circulation line connecting the oil cold end of heating agent MGGH and oil heating agent MGGH hot junction is provided with oil circulating pump, is provided with oil circulating pump outlet regulating valve at the oil-out of oil circulating pump.
The desulphurization denitration clean exhaust system of low temperature waste gas the most according to claim 1, it is characterized in that, the circulation line in the described connection cold end of water heat medium MGGH and water heat medium MGGH hot junction is provided with water circulating pump, and the water outlet of water circulating pump is provided with water circulating pump outlet regulating valve.
7. according to the desulphurization denitration clean exhaust system of the low temperature waste gas described in any one of claim 1-6, it is characterized in that, described exhaust system also includes steam-flue gas heater, and described steam-flue gas heater is between described GGH and the described cold end of water heat medium MGGH.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620402767.1U CN205560807U (en) | 2016-05-06 | 2016-05-06 | Low temperature exhaust gas's SOx/NOx control clean release system |
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| CN201620402767.1U CN205560807U (en) | 2016-05-06 | 2016-05-06 | Low temperature exhaust gas's SOx/NOx control clean release system |
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| CN201620402767.1U Expired - Fee Related CN205560807U (en) | 2016-05-06 | 2016-05-06 | Low temperature exhaust gas's SOx/NOx control clean release system |
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| CN (1) | CN205560807U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841177A (en) * | 2016-05-06 | 2016-08-10 | 山东岱荣节能环保科技有限公司 | Desulfurization and denitration clean discharge system for low temperature exhaust gas |
-
2016
- 2016-05-06 CN CN201620402767.1U patent/CN205560807U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841177A (en) * | 2016-05-06 | 2016-08-10 | 山东岱荣节能环保科技有限公司 | Desulfurization and denitration clean discharge system for low temperature exhaust gas |
| CN105841177B (en) * | 2016-05-06 | 2018-05-15 | 山东岱荣节能环保科技有限公司 | The desulphurization denitration clean exhaust system of low temperature waste gas |
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