SCR (Selective Catalytic Reduction) denitration temperature raising device

Abstract

The utility model provides an SCR (Selective Catalytic Reduction) denitration temperature raising device, which relates to the technical field of environmental protection and comprises a hot-blast stove, a control valve group communicated with a coal gas pipeline and a combustion fan, a flue gas pipeline and a combustor are communicated in the hot-blast stove, and an anti-explosion opening and an output opening communicated with an inlet flue of a denitration device are arranged on the hot-blast stove. The combustor is communicated with the control valve set and the combustion fan, the hot blast stove comprises an inner barrel and a jacket assembly located on the outer side of the inner barrel, and cooling holes are formed in the inner barrel. According to the device, before the SCR denitration device achieves flue gas denitration, the flue gas temperature is increased through mutual cooperation of the hot blast stove, the control valve set, the combustion fan and the combustor, then the follow-up denitration efficiency is improved, the regeneration procedure of a catalyst is achieved, and on the basis, the service life of the hot blast stove can be effectively prolonged through air distribution cooling of low-temperature flue gas; and the jacket assembly is additionally arranged, the heat preservation effect is good, heat loss is effectively reduced, and the using effect of the hot-blast stove is better.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to an SCR denitration and temperature raising device. Background Art

[0002] SCR (Selective Catalytic Reduction) denitrification technology is an efficient and mature air pollution control technology widely used in industrial furnace flue gas treatment. Its main purpose is to remove nitrogen oxides (mainly NOx) in flue gas to meet strict environmental emission standards.

[0003] During the operation of industrial furnaces, the high-temperature flue gas produced by fuel combustion often contains a large amount of NOx, which is one of the main causes of acid rain, photochemical smog and ozone layer destruction. Therefore, effective control of NOx is particularly important. SCR denitrification technology is to use ammonia (NH 3 ) or urea, etc., to reduce NOx to harmless nitrogen (N 2 ) and water vapor (H 2 O).

[0004] However, the SCR reaction usually needs to be carried out within a certain temperature window (generally between 160°C and 400°C). For some industrial furnaces operating at low temperatures, the initial flue gas temperature may be lower than this range, and ammonia cannot be effectively sprayed subsequently. In addition, the denitrification catalyst needs to be heated and regenerated after a period of use.

[0005] Announcement No. CN216693995U proposes a mixed-air hot blast furnace for denitrification of coke oven flue gas. The device can heat up the flue gas and thus improve the efficiency of subsequent denitrification; however, the heat loss of the hot blast furnace is relatively large and the temperature of the flue gas can reach over 1000 degrees during the heating process, at which time the service life of the hot blast furnace will be shortened. Utility Model Content

[0006] The purpose of the utility model is to solve the problems raised in the above background technology, and then proposes an SCR denitration temperature raising device.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] An SCR denitration temperature raising device comprises a hot blast furnace, a control valve group connected to a gas pipeline and a combustion-supporting fan. The hot blast furnace is connected to a flue gas pipeline and a burner, and an explosion-proof port and an output port connected to an inlet flue of a denitration device are provided on the hot blast furnace. The burner is respectively connected to the control valve group and the combustion-supporting fan. The hot blast furnace comprises an inner cylinder and a jacket assembly located outside the inner cylinder. The inner cylinder is provided with cooling holes. A converging cavity connected to the cooling holes is formed between the jacket assembly and the inner cylinder. An air distribution duct connected to the converging cavity is provided on the jacket assembly. The air distribution duct is connected to the air distribution fan, and the air distribution fan is connected to a low-temperature flue gas pipeline.

[0009] Before the SCR denitrification device realizes flue gas denitrification, the device achieves flue gas temperature increase through the cooperation of the hot blast furnace, the control valve group, the combustion-supporting fan and the burner, thereby improving the subsequent denitrification efficiency and realizing the catalyst regeneration process. On this basis, the service life of the hot blast furnace can be effectively extended through air distribution cooling of the low-temperature flue gas, and the addition of a jacket component has a good thermal insulation effect, which effectively reduces heat loss, and the use effect of the hot blast furnace is better.

[0010] Furthermore, the jacket assembly is a single-layer jacket.

[0011] Furthermore, an outer shell is arranged on the outer side of the single-layer jacket, and the outer shell is made of carbon steel.

[0012] The above solution can further reduce heat loss by arranging an outer shell on the outside of the single-layer jacket.

[0013] Furthermore, the jacket assembly is a double-layer jacket, and a vacuum chamber is formed inside the double-layer jacket.

[0014] The above solution can also further reduce heat loss through the vacuum chamber between the double jackets.

[0015] Furthermore, a flow meter is provided on the gas pipeline.

[0016] The above scheme can control the amount of coal gas introduced through the flow meter to control the mixing ratio of flue gas and coal gas, and the mixing ratio of the two is more accurate.

[0017] Furthermore, a plurality of cooling holes facing upward are arranged on the bottom circumference of the inner tube, and the air distribution pipe is located at the side of the jacket assembly. The burner is arranged at the bottom of the jacket assembly and is connected to the inner tube.

[0018] Furthermore, the jacket assembly is provided with an igniter and a fire detector.

[0019] The above scheme arranges the air distribution pipe on the side of the jacket assembly to prevent the low-temperature flue gas from blowing out the lower igniter during the air distribution process, and the normal operation of the burner is achieved through the igniter and the fire detection.

[0020] Furthermore, a thermometer is provided on the jacket assembly.

[0021] The above scheme can measure the internal temperature of the hot blast stove furnace in real time through the thermometer.

[0022] Furthermore, it also includes a spare air distribution fan and a spare combustion-supporting fan.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. The addition of a jacket assembly to the hot blast furnace effectively solves the problem of external heat preservation and internal furnace fire resistance of the hot blast furnace, which prolongs the service life of the hot blast furnace and greatly reduces heat loss;

[0025] 2. The control valve group effectively solves the problem of gas safety;

[0026] 3. The combustion-supporting fan and the distribution fan are used in a standby mode to effectively solve the problem of system operation stability;

[0027] 4. The low-temperature flue gas before denitration is extracted by a fan, which not only reduces the flue gas temperature at the outlet of the hot air furnace, but also reduces gas consumption, avoids the introduction of external air, and does not increase the system load and oxygen content;

[0028] 5. The combustion-supporting fan and coal gas adopt air-fuel ratio control to ensure a stable combustion process and avoid problems such as backfire and flameout. It also improves energy utilization efficiency and reduces the risk of equipment damage caused by unstable combustion;

[0029] 6. The burner adopts automatic control to realize automatic purge, automatic leak detection, automatic ignition, and one-button start and stop functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0031] Figure 2 This is a schematic diagram of the air duct installation;

[0032] Reference numerals:

[0033] 1. Hot air furnace; 101. Jacket assembly; 102. Inner tube; 11. Burner; 12. Air distribution duct; 13. Cooling hole; 14. Explosion-proof port; 15. Ignitor; 16. Output port; 2. Control valve group; 3. Combustion-supporting fan; 4. Air distribution fan. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The utility model is further described in combination with the drawings and embodiments:

[0035] like Figure 1 and Figure 2 As shown, an SCR denitration temperature raising device comprises a hot blast furnace 1, a control valve group 2 connected to a gas pipeline and a combustion-supporting fan 3, the hot blast furnace 1 is connected to a flue gas pipeline (not shown in the figure) and a burner 11, and an explosion-proof port 14 and an output port 16 connected to an inlet flue of the denitration device are provided on the hot blast furnace 1, the burner 11 is respectively connected to the control valve group 2 and the combustion-supporting fan 3, the hot blast furnace 1 comprises an inner tube 102 and a jacket assembly 101 located outside the inner tube 102, the inner tube 102 is provided with a cooling hole 13, a converging cavity connected to the cooling hole 13 is formed between the jacket assembly 101 and the inner tube 102, an air distribution pipe 12 connected to the converging cavity is provided on the jacket assembly 101, the air distribution pipe 12 is connected to the air distribution fan 4, and the air distribution fan 4 is connected to a low-temperature flue gas blast furnace.

[0036] Specifically, it also includes a spare distribution fan and a spare combustion-supporting fan; the spare combustion-supporting fan and the spare distribution fan effectively solve the problem of system operation stability.

[0037] Specifically, the control valve group 2 is provided with double quick-cut valves, gas high and low pressure detection, and automatic leak detection. The gas is interlocked with the pneumatic quick-cut valve. If the gas pressure is too high or too low, the pneumatic quick-cut valve is interlocked and automatically cut off. The valve group automatically detects leaks before ignition to ensure safe gas use.

[0038] The first embodiment of the jacket assembly:

[0039] The specific implementation of the first embodiment of the utility model is as follows: Figure 2 As shown, the jacket assembly 101 is a single-layer jacket, and an outer shell is provided on the outside of the single-layer jacket. The outer shell is not shown in the figure, and the outer shell is made of carbon steel. In this embodiment, a shell is added to the outside of the single-layer jacket to further reduce heat loss, and the outer shell temperature is low so carbon steel can be used.

[0040] Second embodiment of the jacket assembly:

[0041] In the specific implementation of the second embodiment of the utility model, the jacket assembly is a double-layer jacket, a vacuum cavity is formed inside the double-layer jacket, and the vacuum cavity is connected to a vacuum pump; this embodiment can also further reduce heat loss through the vacuum cavity between the double-layer jackets, and the vacuum pump is not shown in the figure.

[0042] Further refinement of the embodiment of the present utility model is as follows: Figure 2 As shown, the bottom circumference of the inner tube 102 is provided with a plurality of vertically upward cooling holes 13 and the air distribution pipe 12 is located at the side of the jacket assembly 101, and the burner 11 is arranged at the bottom of the jacket assembly 101 and is connected with the inner tube 102; for further optimization of the scheme, an igniter 15 and a fire detector (not numbered in the figure) are also provided on the jacket assembly 101; the air distribution pipe 12 is arranged at the side of the jacket assembly 101 to prevent the low-temperature flue gas from blowing out the lower igniter 15 during the air distribution process, and the normal operation of the burner 11 is achieved through the igniter 15 and the fire detector.

[0043] The workflow of this utility model:

[0044] Before operating the SCR denitration device, the temperature of the flue gas is increased by means of the hot blast furnace 1, which can improve the subsequent denitration efficiency and realize the regeneration of the catalyst during the denitration process.

[0045] First, coal gas and flue gas are introduced into the inner tube 102 at the same time, and the mixed gas is ignited and burned through the fire detector and the igniter 15 at the same time. At this time, the temperature inside the hot blast furnace 1 can reach thousands of degrees, and then the fan 4 works to inject the low-temperature flue gas in the low-temperature flue gas pipeline from the air distribution pipe 12 into the convergence cavity. At this time, the low-temperature flue gas in the convergence cavity will flow into the inner tube 102 from the cooling hole 13. At this time, the temperature of the gas can be gradually reduced to 600-700 degrees. This way of configuring low-temperature flue gas can not only ensure the effective heating of the denitrification flue gas, but also reduce the damage of the hot blast furnace 1 caused by excessive temperature, thereby effectively extending the service life of the hot blast furnace 1. At the same time, the jacket component 101 can effectively reduce the amount of heat overflow loss, thereby saving energy. The hot blast furnace 1 provides a stable combustion environment and the flame burns stably. In addition, the hot blast furnace 1 is a negative pressure combustion environment, and no backfire occurs. The low-temperature flue gas flows in the convergence cavity and the jacket has a heat preservation effect;

[0046] In addition, the combustion-supporting fan 3 and the coal gas adopt air-fuel ratio control to ensure a stable combustion process and avoid problems such as backfire and flameout. At the same time, it also improves energy utilization efficiency and reduces the risk of equipment damage caused by unstable combustion;

[0047] By extracting the low-temperature flue gas before denitration through the fan 4, the flue gas temperature at the outlet 16 of the hot blast furnace is reduced, the gas consumption is reduced, and the introduction of external air is avoided, without increasing the system load and oxygen content;

[0048] Compared with the prior art, the device achieves a flue gas temperature increase through the cooperation of the hot blast furnace 1, the control valve group 2, the combustion-supporting fan 3 and the burner 11 before the SCR denitrification device realizes flue gas denitrification, thereby improving the subsequent denitrification efficiency and realizing the catalyst regeneration process. On this basis, the service life of the hot blast furnace 1 can be effectively extended through air distribution cooling of the low-temperature flue gas, and the additional jacket assembly 101 has a good thermal insulation effect, which effectively reduces heat loss, and the use effect of the hot blast furnace 1 is better.

[0049] In some embodiments, a flow meter is provided on the gas pipeline, and the gas pipeline and the flow meter are shown in the figure; this embodiment can control the amount of gas introduced through the flow meter to control the mixing ratio of flue gas and gas, and the mixing ratio of the two is more accurate.

[0050] In other embodiments, Figure 2 As shown, the jacket assembly 101 is provided with a thermometer, which is attached to the specification. Figure 2 This embodiment can measure the internal temperature of the furnace of the hot blast stove 1 in real time through the thermometer.

[0051] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. An SCR denitration temperature raising device, comprising a hot blast furnace (1), a control valve group (2) connected to a gas pipeline, and a combustion-supporting fan (3), wherein the hot blast furnace (1) is connected to a flue gas pipeline and a burner (11), and an explosion-proof port (14) and an output port (16) connected to an inlet flue of a denitration device are provided on the hot blast furnace (1), and the burner (11) is respectively connected to the control valve group (2) and the combustion-supporting fan (3), characterized in that: The hot blast stove (1) comprises an inner cylinder (102) and a jacket assembly (101) located outside the inner cylinder (102); a cooling hole (13) is provided on the inner cylinder (102); a convergence cavity connected to the cooling hole (13) is formed between the jacket assembly (101) and the inner cylinder (102); an air distribution pipe (12) connected to the convergence cavity is provided on the jacket assembly (101); the air distribution pipe (12) is connected to a fan (4); and the fan (4) is connected to a low-temperature flue gas pipeline.

2. The SCR denitration temperature raising device according to claim 1, characterized in that: The jacket assembly (101) is a single-layer jacket.

3. The SCR denitration temperature raising device according to claim 2, characterized in that: An outer shell is arranged on the outer side of the single-layer jacket, and the outer shell is made of carbon steel.

4. The SCR denitration temperature raising device according to claim 1, characterized in that: The jacket assembly (101) is a double-layer jacket, and a vacuum chamber is formed inside the double-layer jacket.

5. The SCR denitration temperature raising device according to claim 1, characterized in that: The gas pipeline is provided with a flow meter.

6. The SCR denitration temperature raising device according to claim 1, characterized in that: The bottom circumference of the inner cylinder (102) is provided with a plurality of cooling holes (13) facing upward vertically, and the air distribution pipe (12) is located on the side of the jacket assembly (101). The burner (11) is arranged at the bottom of the jacket assembly (101) and is connected to the inner cylinder (102).

7. The SCR denitration temperature raising device according to claim 1, characterized in that: The jacket assembly (101) is provided with an igniter (15) and a fire detector.

8. The SCR denitration temperature raising device according to claim 1, characterized in that: The jacket assembly (101) is provided with a thermometer.

9. The SCR denitration temperature raising device according to claim 1, characterized in that: It also includes spare distribution fans and spare combustion-supporting fans.

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