CN217929831U - Steel rolling heating furnace flue gas desulfurization dust removal back low temperature denitrification facility earlier - Google Patents
Steel rolling heating furnace flue gas desulfurization dust removal back low temperature denitrification facility earlier Download PDFInfo
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Abstract
The utility model discloses a low-temperature denitration device after the desulfurization and dust removal of the flue gas of a steel rolling heating furnace, which comprises a soot desulfurization and denitration device, an empty smoke desulfurization and denitration device, a hot blast stove device and a desulfurizer conveying device; the soot desulfurization and denitrification device comprises a raw soot fan, a soot primary heat exchanger, a soot desulfurization device, a soot dedusting device, a soot secondary heat exchanger and a soot low-temperature denitrification device which are sequentially communicated; the air smoke desulfurization and denitrification device comprises an original air smoke fan, an air smoke primary heat exchanger, an air smoke desulfurization device, an air smoke dust removal device, an air smoke air mixing device and an air smoke low-temperature denitrification device which are sequentially communicated. The coal smoke desulfurization and denitrification device and the empty smoke desulfurization and denitrification device share a set of desulfurizer storage, preparation and conveying system, so that the equipment cost and the equipment occupation field are saved; the design of the process of desulfurization and denitrification of the empty smoke is reasonable, and the problem that the empty smoke cannot reach the temperature required by denitrification due to heat loss is avoided.
Description
Technical Field
The utility model relates to a steel rolling heating furnace flue gas treatment facility technical field especially relates to a low temperature denitrification facility behind steel rolling heating furnace flue gas desulfurization dust removal earlier.
Background
With the rapid development of social economy in recent years, the development of the steel industry is also in qualitative leap, so that the environmental pollution is more and more serious, and the steel rolling heating furnace can generate harmful pollutants such as dust, sulfur dioxide, nitrogen oxide and the like in the production process, thereby bringing about little influence on the environment and the life of people. The ecological environment department makes clear requirements on the emission indexes of the steel rolling heating furnace, and the tail gas treatment of the steel rolling heating furnace is urgent.
The smoke of the steel rolling heating furnace is divided into an air smoke system and a soot system. The two systems are directly mixed without handling and are subject to the risk of explosion, and this risk cannot be eliminated according to the prior art. Therefore, the tail gas treatment device of the steel rolling heating furnace must be divided into two systems of air smoke and soot, and any treatment process which is described as one system and does not carry out dangerous treatment is unreasonable and not advisable.
The smoke amount of the steel rolling heating furnace is smaller under normal conditions (normal tens of thousands to hundreds of thousands of Nm) 3 Between h) and at a low temperature (normally between 100 ℃ and 150 ℃).
The utility model discloses a utility model patent of publication No. CN 215693080U discloses a steel rolling heating furnace aftertreatment device, and what its steel rolling heating furnace flue gas was handled and is taken is that desulfurization dust removal technology after the denitration carries out earlier. This process has several disadvantages. 1. Because the flue gas temperature of the steel rolling heating furnace is not high, if denitration is carried out firstly, sulfur dioxide of flue gas species is easy to react with ammonia to generate ammonium bisulfate, and the ammonium bisulfate can be attached to the surface of the catalyst to cause blockage and catalyst poisoning. Once the catalyst is poisoned or clogged, the desorption is frequently required, and the desorption cannot fundamentally solve the poisoning or clogging. In the case of medium-high temperature denitration, the flue gas temperature needs to be controlled to be more than 280 ℃, in such a case, the requirement on the temperature rise cost is too high, and the model selection of the hot blast stove and the denitration reactor is increased greatly. The cost of the apparatus and the floor space required for construction are high and therefore uneconomical. 2. In the patent, flue gas of the steel rolling heating furnace directly enters the denitration device without dust removal. This process has the problem of dust plugging the catalyst. In case block up, denitrification facility's resistance can increase, and denitrification facility's catalyst contactable surface can greatly reduced, and denitration efficiency can greatly reduced, can only control through frequently blowing the ash, but can not fundamentally solve the problem of jam.
The invention with publication number CN113877419A discloses a heat accumulating type steel rolling heating furnace low-temperature flue gas desulfurization and denitrification system and method, which sequentially and efficiently desulfurize, dedust and denitrate the flue gas of a low-temperature heating furnace, so that the denitration catalyst is ensured to be used in a low-sulfur and low-dust environment, the problem that the denitration effect is influenced by the poisoning of the denitration catalyst is avoided, the treated flue gas meets the environmental protection requirements, and no secondary pollution is generated. Meanwhile, the coal smoke and the air smoke are heated by using the waste heat of the smoke, so that the requirements of desulfurization and denitration reaction temperature are met, the effects of energy conservation, consumption reduction, safety and environmental protection are achieved, the occupied area is obviously reduced, and the primary investment cost and the operation cost are saved. On one hand, in the process of desulfurization, dust removal and denitration of the empty smoke, the temperature of the empty smoke is firstly raised to the temperature required by denitration through the empty smoke heat exchanger and the empty smoke heating mixer, and then the empty smoke desulfurization, dust removal and denitration are sequentially carried out, wherein in the process of desulfurization and dust removal of the empty smoke, the temperature is high, the heat dissipation speed is high, the energy conservation and consumption reduction are not facilitated, and the problem that the temperature of the empty smoke cannot reach the denitration temperature when the empty smoke enters the denitration equipment due to the heat dissipation also exists; on the other hand, the soot desulfurization device and the empty-smoke desulfurization device respectively need a set of storage, preparation and conveying system of a desulfurizing agent (finished sodium bicarbonate), so that the occupied area is large, and the equipment cost is high.
Based on the statement, how to design a steel rolling heating furnace flue gas desulfurization earlier back low temperature denitrification facility that removes dust of energy saving and consumption reduction, area occupied is little, with low costs the utility model discloses the technical problem that will solve.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to prior art's not enough, provide a steel rolling heating furnace flue gas desulfurization earlier back low temperature denitrification facility that removes dust of energy saving and consumption reduction, area occupied is little, with low costs.
The utility model discloses a following technical means realizes solving above-mentioned technical problem:
a steel rolling heating furnace flue gas desulfurization dust removal after low temperature denitrification facility, including the desulfurization denitrification facility of the coal smoke, empty smoke desulfurization denitrification facility, hot-blast furnace apparatus and desulfurizer conveying appliance;
the soot desulfurization and denitrification device comprises a raw soot fan, a soot primary heat exchanger, a soot desulfurization device, a soot dedusting device, a soot secondary heat exchanger and a soot low-temperature denitrification device which are sequentially communicated; the exhaust end of the soot low-temperature denitration device is communicated with a heat source inlet of the soot primary heat exchanger;
the air smoke desulfurization and denitration device comprises an original air smoke fan, an air smoke primary heat exchanger, an air smoke desulfurization device, an air smoke dust removal device, an air smoke air mixing device and an air smoke low-temperature denitration device which are sequentially communicated; the exhaust end of the air-smoke low-temperature denitration device is communicated with a heat source inlet of the air-smoke primary heat exchanger;
the hot blast stove device is communicated with a heat source inlet of the soot secondary heat exchanger and the air-smoke air mixing device; a heat source outlet of the coal smoke secondary heat exchanger is communicated with the air-smoke air mixing device;
the desulfurizer conveying device comprises a desulfurizer powder bin, a grinder, a Roots blower and a three-way pipe; the outlet of the desulfurizer powder bin is communicated with the grinding machine; the outlet of the grinder is communicated with the Roots blower; two ends of the three-way pipe are respectively communicated with the soot desulfurization device and the empty smoke desulfurization device, and the other end of the three-way pipe is connected with an outlet of the Roots branch machine.
As an improvement of the technical scheme, the flue gas of the steel rolling heating furnace is firstly desulfurized and dedusted and then subjected to low-temperature denitration, and the low-temperature denitration is connected with a soot ammonia water evaporator; the soot ammonia water evaporator is connected with a soot introducing fan; and the inlet of the soot introducing fan is communicated with the outlet of the soot low-temperature denitration device.
As an improvement of the technical scheme, the steel rolling heating furnace flue gas desulfurization and dust removal and then low-temperature denitration device is characterized in that an air flue gas ammonia water evaporator is connected to the air flue gas low-temperature denitration device; the air smoke ammonia water evaporator is connected with an air smoke introducing fan; and the inlet of the air smoke introducing fan is communicated with the outlet of the air smoke low-temperature denitration device.
As an improvement of the technical scheme, the steel rolling heating furnace flue gas is firstly desulfurized and dedusted and then subjected to low-temperature denitration, and a heat source outlet of the coal smoke primary heat exchanger is connected with a coal smoke evacuation fan; the outlet of the soot evacuation fan is connected with a soot chimney; a heat source outlet of the air-smoke primary heat exchanger is connected with an air-smoke emptying fan; and the outlet of the air smoke evacuation fan is connected with an air smoke chimney.
The utility model has the advantages of: (1) the coal smoke desulfurization and denitrification device and the empty smoke desulfurization and denitrification device share a set of desulfurizer storage, preparation and conveying system, so that the equipment cost and the equipment occupation field are saved; (2) in the air smoke desulfurization and denitration process, the air smoke is firstly desulfurized and dedusted, then the air smoke is directly denitrated after being heated to the denitration temperature requirement for the second time, and compared with the process of firstly heating to the temperature required by denitration and then sequentially carrying out desulfurization, dedusting and denitration, the heat loss in the air smoke desulfurization and dedusting process is reduced, and the problem that the temperature required by denitration cannot be reached when the air smoke enters the denitration equipment due to the heat loss in the desulfurization and dedusting process is avoided.
Drawings
FIG. 1 is the process flow diagram of the low temperature denitration device after the desulfurization and dust removal of the flue gas of the steel rolling heating furnace of the utility model.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example 1
Referring to fig. 1, a steel rolling heating furnace flue gas desulfurization and dust removal and then low temperature denitration device comprises a soot desulfurization and denitration device, an air flue desulfurization and denitration device, a hot blast stove device 3 and a desulfurizer conveying device;
the soot desulfurization and denitrification device comprises a raw soot fan 11, a soot primary heat exchanger 12, a soot desulfurization device 13, a soot dust removal device 14, a soot secondary heat exchanger 15 and a soot low-temperature denitrification device 16 which are sequentially communicated; the exhaust end of the low-temperature soot denitration device 16 is communicated with the heat source inlet of the primary soot heat exchanger 12;
the air smoke desulfurization and denitrification device comprises an original air smoke fan 21, an air smoke primary heat exchanger 22, an air smoke desulfurization device 23, an air smoke dust removal device 24, an air smoke air mixing device 25 and an air smoke low-temperature denitrification device 26 which are sequentially communicated; the exhaust end of the air-smoke low-temperature denitration device 26 is communicated with the heat source inlet of the air-smoke primary heat exchanger 22;
the hot blast stove device 3 is communicated with a heat source inlet of the soot secondary heat exchanger 15 and the air-smoke air mixing device 25; the heat source outlet of the coal smoke secondary heat exchanger 15 is communicated with an air-smoke air mixing device 25;
the desulfurizer conveying device comprises a desulfurizer powder bin 41, a grinder 42, a Roots blower 43 and a three-way pipe 44; the outlet of the desulfurizer powder bin 41 is communicated with a grinder 42; the outlet of the grinder 42 is communicated with a Roots blower 43; two ends of the three-way pipe 44 are respectively communicated with the soot desulfurization device 13 and the empty smoke desulfurization device 23, and the other end of the three-way pipe is connected with an outlet of the roots extension 43;
the process of desulfurization and denitrification of the soot is as follows: the method comprises the following steps that soot discharged by a steel rolling heating furnace is conveyed into a soot primary heat exchanger 12 by a raw soot blower 11 for primary heat exchange so as to raise the temperature of the soot and meet the requirement of desulfurization temperature, the soot enters a soot desulfurization device 13 for desulfurization after heat exchange, the desulfurized soot enters a soot dust removal device 14 for dust removal, the soot enters a soot secondary heat exchanger 15 for secondary temperature rise after dust removal is finished so as to meet the requirement of denitration temperature, and then the soot is sent into a soot low-temperature denitration device 16 for denitration treatment; wherein, the heat source of the first-stage soot heat exchanger 12 is the desulfurized and denitrated clean air discharged from the low-temperature soot denitration device 16; the heat source of the second-stage soot heat exchanger 15 is hot air delivered by the hot-blast stove device 3;
the process of the desulfurization and denitrification of the empty smoke comprises the following steps: conveying the air smoke discharged by the steel rolling heating furnace into an air smoke primary heat exchanger 22 by an original air smoke fan 21 for primary heating to meet the requirement of desulfurization temperature, sequentially feeding the air smoke into an air smoke desulfurization device 23 and an air smoke dust removal device 24 for desulfurization and dust removal after heat exchange, feeding the flue gas subjected to desulfurization and dust removal into an air smoke mixing device 25 for secondary heating to reach the temperature required by denitration, and feeding the flue gas into an air smoke low-temperature denitration device 26 for denitration treatment; wherein, the heat source of the air-smoke primary heat exchanger 22 is the desulfurized and denitrated clean air discharged by the air-smoke low-temperature denitration device 26; the principle of empty smoke secondary heating is as follows: hot air conveyed by the hot blast stove device 3 exchanges heat with the soot in the soot secondary heat exchanger 15, and then is conveyed into the air-smoke air mixing device 25 to be mixed with the air smoke, so that the temperature of the air smoke is raised, and meanwhile, part of hot air is directly conveyed into the air-smoke air mixing device 25 by the hot blast stove device 3 to supplement heat, so that the temperature of the air smoke reaches the denitration temperature requirement;
wherein the desulfurization temperature of the soot and the air smoke is above 140 ℃, and the denitration temperature of the soot and the air smoke is above 180 ℃; considering resources and cost, the desulfurization temperature is designed to be between 140 and 180 ℃, and the denitration temperature is designed to be between 180 and 230 ℃; the temperature of hot air discharged by the hot air furnace device 3 is about 600 ℃; the first-stage soot heat exchanger 12, the second-stage soot heat exchanger 15 and the first-stage air-smoke heat exchanger 22 include, but are not limited to, a shell and tube heat exchanger, a GGH rotary heat exchanger, a plate heat exchanger and the like;
the empty smoke and soot system share a set of desulfurizer (finished product of sodium bicarbonate) storage, preparation and conveying system; specifically, finished baking soda is discharged into a desulfurizer powder bin 41 through a ton bag, a manual gate valve and a variable-frequency star discharger are arranged at the lower part of the desulfurizer powder bin 41, the finished baking soda is conveyed into a grinding machine 42 through the variable-frequency star discharger and ground into fine powder of about 800 meshes, and the fine powder is conveyed into a soot desulfurization device 13 and an empty-smoke desulfurization device 23 under the action of a Roots blower 43;
the high-temperature clean flue gas after desulfurization and denitrification exchanges heat with the original flue gas (empty flue gas and soot) of a steel rolling heating furnace through a primary heat exchanger, the flue gas after heat exchange is subjected to SDS dry desulfurization, and then is subjected to bag-type dust remover to obtain the purified flue gas after desulfurization and dedusting, and the purified flue gas is heated under the action of hot air of a hot air furnace to reach the temperature required by denitrification, so that the gas consumption required by heating can be reduced; the flue gas of the steel rolling heating furnace is desulfurized and dedusted and then denitrated, so that the denitration catalyst can be better protected, the blockage and poisoning phenomena of the denitration catalyst are greatly reduced by the flue gas after desulfurization and dedusting, the denitration efficiency is greatly improved, and the service life of the catalyst is prolonged; the whole device has simple process, high desulfurization, dedusting and denitration efficiency, low operation and investment cost and convenient maintenance and repair;
(1) the coal smoke desulfurization and denitrification device and the empty smoke desulfurization and denitrification device share a set of desulfurizer storage, preparation and conveying system, so that the equipment cost and the equipment occupation field are saved; (2) in the air smoke desulfurization and denitration process, the air smoke is firstly desulfurized and dedusted, then the air smoke is directly denitrated after being heated to the denitration temperature requirement for the second time, and compared with the process of firstly heating to the temperature required by denitration and then sequentially carrying out desulfurization, dedusting and denitration, the heat loss in the air smoke desulfurization and dedusting process is reduced, and the problem that the temperature required by denitration cannot be reached when the air smoke enters the denitration equipment due to the heat loss in the desulfurization and dedusting process is avoided.
As an improvement of the above technical solution, the soot ammonia water evaporator 161 is connected to the soot low-temperature denitration device 16; the soot ammonia water evaporator 161 is connected with a soot introduction fan 162; the inlet of the soot introduction fan 162 is communicated with the outlet of the soot low-temperature denitration device 16;
ammonia water (20% ammonia water) is conveyed into a two-fluid spray gun of the soot ammonia water evaporator 161 through an ammonia water conveying pump, the two-fluid spray gun atomizes the ammonia water by adopting compressed nitrogen or compressed air, a soot introduction fan 162 extracts part of high-temperature clean flue gas discharged by the soot low-temperature denitration device 16 and conveys the high-temperature clean flue gas into the soot ammonia water evaporator 161, and the atomized ammonia water is gasified and conveyed into the soot low-temperature denitration device 16 through the high-temperature clean flue gas;
as an improvement of the above technical solution, an air flue gas ammonia water evaporator 261 is connected to the air flue gas low temperature denitration device 26; an air smoke introducing fan 262 is connected to the air smoke ammonia water evaporator 261; the inlet of the air smoke introducing fan 262 is communicated with the outlet of the air smoke low-temperature denitration device 26;
ammonia water (20% ammonia water) is conveyed into a two-fluid spray gun of the air smoke ammonia water evaporator 261 through an ammonia water conveying pump, the two-fluid spray gun atomizes the ammonia water by adopting compressed nitrogen or compressed air, an air smoke introducing fan 262 extracts part of high-temperature clean smoke discharged by the air smoke low-temperature denitration device 26 and conveys the part of the high-temperature clean smoke into the air smoke ammonia water evaporator 261, and the atomized ammonia water is gasified and conveyed into the air smoke low-temperature denitration device 16 through the high-temperature clean smoke;
the heat energy of ammonia water gasification adopts the waste heat in the high-temperature clean flue gas discharged by the soot low-temperature denitration device 16 and the empty-smoke low-temperature denitration device 26, so that the energy consumed by ammonia water gasification is reduced, and the resources and the cost are saved.
As an improvement of the above technical solution, a heat source outlet of the first-stage soot heat exchanger 12 is connected with a soot evacuation fan 17; the outlet of the soot evacuation fan 17 is connected with a soot chimney 18; the heat source outlet of the air-smoke primary heat exchanger 22 is connected with an air-smoke evacuation fan 27; the outlet of the air-smoke evacuation fan 27 is connected with an air-smoke chimney 28;
one part of the high-temperature clean flue gas discharged by the low-temperature soot denitration device 16 and the low-temperature empty-soot denitration device 26 is used for gasifying ammonia water, and the other part of the high-temperature clean flue gas is exhausted through the soot chimney 18 and the empty-soot chimney 28 after heat exchange with soot and empty smoke in the primary soot heat exchanger 12 and the primary empty-soot heat exchanger 22.
A pipeline from flue gas from a raw flue gas fan 11 of a steel rolling heating furnace to a raw flue gas inlet of a primary flue gas heat exchanger 12 is provided with a flue gas inlet on-line detection device, and a flue gas outlet on-line monitoring device is arranged on a flue gas chimney 18; the pipeline from the smoke coming out of the air-smoke original fan 21 of the steel rolling heating furnace to the original smoke inlet of the air-smoke primary heat exchanger 22 is provided with an air-smoke inlet online detection device, the air-smoke chimney 28 is provided with an air-smoke outlet online monitoring device, and the using amount of the desulfurizer and the ammonia water can be controlled in real time through data comparison of the inlet and outlet online monitoring devices, so that the environment-friendly emission requirement is met while the least investment is used.
The internal design principle of the soot low-temperature denitration device 16 is consistent with that of the air-smoke low-temperature denitration device 26, and flue guide plates are arranged in front of the soot low-temperature denitration device 16 and the air-smoke low-temperature denitration device 26 to rectify the raw flue gas, so that the flue gas at the inlets of the soot low-temperature denitration device 16 and the air-smoke low-temperature denitration device 26 is distributed more uniformly, the system resistance is reduced, and the denitration efficiency is improved; meanwhile, a homogenizing device is arranged at the front end of the denitration device, so that the ammonia gas and the raw flue gas are uniformly mixed, the mixed flue gas can fully react under the action of a catalyst, and the denitration efficiency is improved; in addition, a soot blower is arranged in the denitration device, partial particles are adhered to the surface of the catalyst in actual operation, the soot blower has the function of ensuring that the particles cannot block catalyst holes and the denitration reaction is normally and stably carried out, and the soot blower comprises but is not limited to sound wave soot blowing, shock wave soot blowing, rake type soot blowing and the like; finally, lay the catalyst bed among the denitrification facility, according to the system needs, can lay "N +1" layer catalyst, wherein "N" layer is the most economic laying of project initial stage system, can consider when N layer catalyst efficiency reduces to install additional surplus "1" layer catalyst, still can guarantee holistic denitration efficiency and the discharge to reach standard of system.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. The utility model provides a steel rolling heating furnace flue gas desulfurization dust removal back low temperature denitrification facility which characterized in that: comprises a coal smoke desulfurization and denitrification device, an empty smoke desulfurization and denitrification device, a hot blast furnace device (3) and a desulfurizer conveying device;
the soot desulfurization and denitrification device comprises a raw soot fan (11), a soot primary heat exchanger (12), a soot desulfurization device (13), a soot dust removal device (14), a soot secondary heat exchanger (15) and a soot low-temperature denitrification device (16) which are sequentially communicated; the exhaust end of the soot low-temperature denitration device (16) is communicated with the heat source inlet of the soot primary heat exchanger (12);
the air smoke desulfurization and denitrification device comprises an original air smoke fan (21), an air smoke primary heat exchanger (22), an air smoke desulfurization device (23), an air smoke dust removal device (24), an air smoke air mixing device (25) and an air smoke low-temperature denitrification device (26) which are sequentially communicated; the exhaust end of the air-smoke low-temperature denitration device (26) is communicated with a heat source inlet of the air-smoke primary heat exchanger (22);
the hot blast stove device (3) is communicated with a heat source inlet of the secondary soot heat exchanger (15) and the air-smoke air mixing device (25); a heat source outlet of the coal smoke secondary heat exchanger (15) is communicated with an air-smoke air mixing device (25);
the desulfurizer conveying device comprises a desulfurizer powder bin (41), a grinder (42), a Roots blower (43) and a three-way pipe (44); the outlet of the desulfurizer powder bin (41) is communicated with the grinder (42); the outlet of the grinder (42) is communicated with a Roots blower (43); two ends of the three-way pipe (44) are respectively communicated with the soot desulfurization device (13) and the empty smoke desulfurization device (23), and the other end of the three-way pipe is connected with an outlet of the Roots blower (43).
2. The steel rolling heating furnace flue gas desulfurization and dust removal and then low-temperature denitration device according to claim 1, characterized in that: the low-temperature denitration device (16) for the soot is connected with a soot ammonia water evaporator (161); the soot ammonia water evaporator (161) is connected with a soot introduction fan (162); and the inlet of the soot introduction fan (162) is communicated with the outlet of the soot low-temperature denitration device (16).
3. The steel rolling heating furnace flue gas desulfurization and dust removal and then low-temperature denitration device according to claim 1, characterized in that: an air smoke ammonia water evaporator (261) is connected to the air smoke low-temperature denitration device (26); an air smoke introducing fan (262) is connected to the air smoke ammonia water evaporator (261); and the inlet of the air smoke introducing fan (262) is communicated with the outlet of the air smoke low-temperature denitration device (26).
4. The steel rolling heating furnace flue gas desulfurization and dust removal and then low-temperature denitration device according to claim 1, characterized in that: a heat source outlet of the soot primary heat exchanger (12) is connected with a soot emptying fan (17); the outlet of the soot evacuation fan (17) is connected with a soot chimney (18); a heat source outlet of the air-smoke primary heat exchanger (22) is connected with an air-smoke evacuation fan (27); the outlet of the air smoke exhaust fan (27) is connected with an air smoke chimney (28).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221696045.3U CN217929831U (en) | 2022-06-30 | 2022-06-30 | Steel rolling heating furnace flue gas desulfurization dust removal back low temperature denitrification facility earlier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221696045.3U CN217929831U (en) | 2022-06-30 | 2022-06-30 | Steel rolling heating furnace flue gas desulfurization dust removal back low temperature denitrification facility earlier |
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