CN217068347U - Low-temperature control flue gas denitration system - Google Patents
Low-temperature control flue gas denitration system Download PDFInfo
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- CN217068347U CN217068347U CN202220217654.XU CN202220217654U CN217068347U CN 217068347 U CN217068347 U CN 217068347U CN 202220217654 U CN202220217654 U CN 202220217654U CN 217068347 U CN217068347 U CN 217068347U
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Abstract
The utility model discloses a low-temperature control flue gas denitration system, which belongs to the technical field of flue gas denitration and comprises a denitration assembly, an oxidation reaction assembly and a temperature control assembly; the denitration assembly comprises a washing tower and an atomizing spray gun; the oxidation reaction component comprises an ozone generator, an ozone delivery pipe and an ozone mixer which are connected in sequence; the temperature control assembly comprises an air inlet pipe and a temperature sensor; the washing tower is connected with a smoke purifying pipe, the ozone mixer is arranged on the smoke purifying pipe, the air inlet pipe is communicated with the smoke purifying pipe, and the temperature sensor is arranged in the smoke purifying pipe; and an electric valve is arranged on the air inlet pipe. The denitration system provided by the patent can quickly start/adjust the input quantity of ozone and the temperature of the flue gas in the smoke purification pipe, ensures that the reaction process of the ozone and NO is carried out in a reasonable low-temperature range, and improves the utilization rate of the ozone; simple structure, convenient operation, low cost and high response speed.
Description
Technical Field
The utility model belongs to the technical field of the flue gas denitration, especially a low temperature accuse temperature flue gas denitration system.
Background
The scrap copper shaft furnace uses natural gas as fuel, and combustion flue gas contains a certain amount of nitrogen oxides, wherein 90-95% of the nitrogen oxides are NO. During normal operation, the concentration of nitrogen oxide in the smoke of the shaft furnace is 30-80mg/m 3 In the meantime. But abnormal operating conditionsWhen the content of the nitrogen oxide in the flue gas can reach 100-150mg/m 3 Exceeds the maximum value of the existing special emission of the reclaimed copper pollutants by 100mg/m 3 . Once exceeding standard, measures are required to be taken immediately to remove the nitrogen oxides in the flue gas of the scrap copper shaft furnace, and the condition that the time accords with a special emission limit value is ensured.
The flue gas of the scrap copper shaft furnace has the characteristics that firstly, the concentration of nitrogen oxides is not high as a whole and does not always exceed the standard; secondly, the total amount of nitrogen oxide is small, and the amount of nitrogen oxide to be removed under the peak condition is only about 0.35 kg/h; thirdly, the temperature of the flue gas is lower and fluctuates frequently within the range of 150 ℃ to 250 ℃.
In the prior art, for example, chinese patent application CN111514735A provides a system and a method for desulfurization and denitration by ozone, the system utilizes a heat exchange device to adjust the temperature of nitrogen oxide absorption liquid and flue gas, so as to reduce the decomposition speed of ozone under the condition of flue gas temperature and improve the utilization rate of ozone. For example, the chinese granted patent CN208626983U provides a high-concentration nitrogen oxide flue gas denitration system, wherein boiler tail gas enters a preliminary oxidation device through a draught fan, and a liquid oxidation liquid is sprayed for preliminary oxidation; then the residual nitrogen oxide in the flue gas is removed through a plasma flue gas purification device and an ozone injection device. For another example, chinese granted patent CN205886559U provides a flue gas ozone denitration system for coal-fired power plants, which makes the coal-fired flue gas and ozone cross, mix and react through a mixing reaction device, and has high removal efficiency of nitrogen oxides.
However, compared with the amount of nitrogen oxides to be removed from the flue gas of the scrap copper shaft furnace, the above systems and devices have high denitration efficiency, but have complex structure, high manufacturing cost and high denitration operation cost; the removal of nitrogen oxides in the flue gas temperature range of the scrap copper shaft furnace is difficult to realize.
Disclosure of Invention
In order to solve the problems of the prior art, the utility model provides a low temperature accuse temperature flue gas denitration system realizes through following technical scheme.
A low-temperature control flue gas denitration system comprises a denitration assembly, an oxidation reaction assembly and a temperature control assembly; the denitration assembly comprises a washing tower and an atomizing spray gun; the oxidation reaction component comprises an ozone generator, an ozone delivery pipe and an ozone mixer which are connected in sequence; the temperature control assembly comprises an air inlet pipe and a temperature sensor; the washing tower is connected with a smoke purifying pipe, the ozone mixer is arranged on the smoke purifying pipe, the air inlet pipe is communicated with the smoke purifying pipe, and the temperature sensor is arranged in the smoke purifying pipe; and an electric valve is arranged on the air inlet pipe.
In the low-temperature-control flue gas denitration system, the washing tower is connected with the bag type dust collector through the flue gas purification pipe; the flue gas discharged from the bag filter is flue gas which has undergone a desulfurization process. The oxidation reaction assembly is used for generating ozone and promoting the ozone and the flue gas to be mixed and reacted in the smoke purifying pipe; an atomizing spray gun in the washing tower is used for spraying pure water mist and adsorbing nitrogen dioxide generated by reaction of ozone, NO and other nitrogen oxides in dissolved flue gas to generate nitric acid solution for recycling. The temperature measuring range of the temperature sensor (such as a thermocouple) can select components covering the temperature range of low-temperature flue gas, the temperature of the flue gas in the smoke purifying pipe can be monitored by the temperature sensor at any time, and the temperature sensor is used for controlling the opening and closing of an electric valve (such as an electric butterfly valve) on the air inlet pipe, further controlling the flow of outside air and finally adjusting the temperature of the flue gas.
The specific working process of the low-temperature control flue gas denitration system is as follows: when the scrap copper shaft furnace is produced, ozone generated by the ozone generator is treated by the ozone mixer, fully mixed and reacted with flue gas to be denitrated, and oxidized to generate NO 2 (ii) a The flue gas after the oxidation reaction enters a washing tower; simultaneously, the atomizing spray gun is started to spray water mist liquid drops which are reversely (downwards) sprayed into the smoke, and the liquid drops absorb NO in the smoke 2 Then settling and collecting to realize flue gas denitration; and (4) discharging the denitrated flue gas through a chimney, and sending the collected waste liquid into a sewage treatment system for further purification. In the denitration process, when the temperature sensor monitors that the temperature of the flue gas flowing into the washing tower exceeds a preset upper limit threshold value, the electric valve is started in an interlocking manner, and the flue gas in the flue gas purification pipe generates negative pressure due to flowing of the flue gas, so that the outside air is sucked; when the temperature of the flue gas is lower than a preset lower limit threshold value, the electric valve unitThe lock is closed and the intake of outside air is stopped. Therefore, the temperature of the smoke in the smoke purifying pipe is maintained within a certain reasonable range.
Preferably, the air inlet pipe is connected to the smoke cleaning pipe on the side of the ozone mixer far away from the washing tower, and the temperature sensor is positioned in the smoke cleaning pipe between the air inlet pipe and the ozone mixer. The connecting part of the air inlet pipe and the smoke purifying pipe is arranged on one side of the ozone mixer far away from the washing tower, and the temperature sensor is arranged between the air inlet pipe and the ozone mixer, so that the on-line real-time monitoring and the effective control of the smoke temperature are completed before the smoke and the ozone are mixed, and then the reaction of nitrogen oxides and ozone in the smoke near the ozone mixer is promoted, and the reaction of the nitrogen oxides is promoted to be complete.
Preferably, the ozone delivery pipe is provided with a stop valve, a filter and a flowmeter. Through the angle of adjustment stop valve, observe the flowmeter indicating value and change for the input of increase and decrease ozone.
Preferably, the top of the washing tower is provided with a nitrogen oxide detection device. According to the concentration value of the nitrogen oxides in the flue gas detected by the nitrogen oxide detection device, the flow of ozone in the ozone conveying pipe is further controlled, and the concentration of the discharged nitrogen oxides is ensured to meet the requirements.
Preferably, the bottom of the washing tower is provided with a liquid collecting tank. The liquid collecting tank is used for recovering the acidic wastewater after adsorbing the nitrogen dioxide.
Preferably, an air delivery pump is arranged on the air inlet pipe. The air transmission pump is used for promoting the outside air to enter the smoke purifying pipe.
Preferably, at least two groups of the atomizing spray guns are arranged in the washing tower along the vertical direction.
Compared with the prior art, the beneficial effects of the utility model are that: the denitration system provided by the patent can quickly start/adjust the input quantity of ozone and the temperature of the flue gas in the smoke purification pipe, ensures that the reaction process of the ozone and NO is carried out in a reasonable low-temperature range, and improves the utilization rate of the ozone; simple structure, convenient operation, low cost and high response speed.
Drawings
Fig. 1 is a schematic structural diagram of a low-temperature-controlled flue gas denitration system described in embodiment 1;
FIG. 2 is a schematic structural diagram of the low-temperature-controlled flue gas denitration system according to embodiment 2;
in the figure: 1. a washing tower; 2. an atomizing spray gun; 3. an ozone generator; 4. an ozone delivery pipe; 5. an ozone mixer; 6. an air inlet pipe; 7. a temperature sensor; 8. cleaning the smoke pipe; 9. an electrically operated valve; 10. a stop valve; 11. a filter; 12. a flow meter; 13. a nitrogen oxide detection device; 14. a liquid collecting tank; 15. air delivery pump.
Detailed Description
The technical solutions of the embodiments in this patent will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments, not all embodiments, of this patent. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the patent without making creative efforts, shall fall within the protection scope of the patent.
In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate the description of the patent and to simplify the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the patent. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of this patent, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.
The patent is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Example 1
As shown in fig. 1, the low-temperature-control flue gas denitration system provided in this embodiment includes a denitration assembly, an oxidation reaction assembly, and a temperature control assembly; the denitration assembly comprises a washing tower 1 and an atomizing spray gun 2; the oxidation reaction component comprises an ozone generator 3, an ozone delivery pipe 4 and an ozone mixer 5 which are connected in sequence; the temperature control assembly comprises an air inlet pipe 6 and a temperature sensor 7; the washing tower 1 is connected with a smoke purifying pipe 8, the ozone mixer 5 is arranged on the smoke purifying pipe 8, the air inlet pipe 6 is communicated with the smoke purifying pipe 8, and the temperature sensor 7 is arranged in the smoke purifying pipe 8; an electric valve 9 is arranged on the air inlet pipe 6.
In the low-temperature-control flue gas denitration system, the washing tower is connected with the bag type dust collector through the flue gas purification pipe; the flue gas discharged from the bag filter is flue gas which has undergone a desulfurization process. The oxidation reaction assembly is used for generating ozone and promoting the ozone and the flue gas to be mixed and reacted in the smoke purifying pipe; an atomizing spray gun (the flow is 33.3L/min) in the washing tower is used for spraying pure water mist, adsorbing nitrogen dioxide generated by the reaction of ozone, NO and other nitrogen oxides in the dissolved flue gas, and recycling the generated nitric acid solution. The temperature measuring range of the temperature sensor can select components covering the temperature range of the low-temperature smoke (for example, a thermocouple with the measuring range of-200 and 400 ℃ is selected as the temperature sensor), the temperature of the smoke in the smoke purifying pipe can be monitored at any time through the temperature sensor, an electric valve (for example, an electric butterfly valve) on an air inlet pipe (pipe diameter DN400) is controlled to be opened and closed, the flow of the outside air is further controlled, and the temperature of the smoke is finally adjusted.
The specific working process of the low-temperature control flue gas denitration system is as follows: when the scrap copper shaft furnace is produced, the ozone generated by the ozone generator is treated by the ozone mixer and is denitratedThe flue gas is fully mixed and reacted to generate NO by oxidation 2 (ii) a The ozone mixer is a common device on the market, in the embodiment, the diameter of the ozone mixer and the diameter of the smoke purifying pipe are phi 900mm, and the diameter of the ozone conveying pipe is phi 50 mm; the flue gas after the oxidation reaction enters a washing tower; simultaneously starting an atomizing spray gun (using purified water, the particle size of the liquid drops is less than 100 mu m), spraying water mist liquid drops, reversely (downwards) spraying the water mist liquid drops into the smoke, and absorbing NO in the smoke by the liquid drops 2 Then settling and collecting to realize flue gas denitration; and (4) discharging the denitrated flue gas through a chimney, and sending the collected waste liquid into a sewage treatment system for further purification.
In the denitration process, when the temperature sensor monitors that the temperature of the flue gas flowing into the washing tower exceeds a preset upper limit threshold (for example 160 ℃), the electric valve is started in an interlocking manner, and the flue gas in the flue gas purification pipe generates negative pressure to suck in outside air; when the temperature of the flue gas is lower than a preset lower limit threshold (for example, 60 ℃), the electric valve interlock is closed, and the outside air is stopped being sucked. Thereby realizing that the temperature of the smoke in the smoke cleaning pipe is maintained in the range of 50-180 ℃.
Example 2
As shown in fig. 2, in the low temperature control flue gas denitration system provided in this embodiment, compared with embodiment 1, the air inlet pipe 6 is connected to the clean flue pipe 8 on the side of the ozone mixer 5 far away from the washing tower 1, and the temperature sensor 7 is located in the clean flue pipe 8 between the air inlet pipe 6 and the ozone mixer 5; a stop valve 10, a filter 11 and a flowmeter 12 are arranged on the ozone delivery pipe 4; the top of the washing tower 1 is provided with a nitrogen oxide detection device 13, the bottom of the washing tower 1 is provided with a liquid collecting tank 14, and the air inlet pipe 6 is provided with an air conveying pump 15.
For example, the sump at the lower part of the scrubber tower has an inner diameter of 1.5m and a height of 2 m. The upper part of the washing tower can be additionally provided with a nitrogen oxide detection device, and the top of the washing tower is also provided with a chimney with the diameter of phi 1000 mm. The washing tower and the liquid collecting tank are carbon steel lining glass fiber reinforced plastic anticorrosive layers.
The connecting part of the air inlet pipe and the smoke purifying pipe is arranged on one side of the ozone mixer far away from the washing tower, and the temperature sensor is arranged between the air inlet pipe and the ozone mixer, so that the on-line real-time monitoring and the effective control of the smoke temperature are completed before the smoke and the ozone are mixed, and then the reaction of nitrogen oxides and ozone in the smoke near the ozone mixer is promoted, and the reaction of the nitrogen oxides is promoted to be complete.
In operation, observing the concentration value of the nitrogen oxides in the flue gas displayed by the nitrogen oxide detection device and the indication value change of the flowmeter; when the concentration value of nitrogen oxides is significantly less than 60mg/m 3 When the ozone is used, the opening degree of the stop valve is reduced, and the input quantity of ozone is reduced; when the concentration value of nitrogen oxides is still higher than 60mg/m 3 In the process, the opening degree of the stop valve is increased, and the input quantity of ozone is increased. The reaction degree of the ozone and the nitrogen oxides is controlled by increasing or decreasing the input amount of the ozone.
The above embodiments describe the implementation of the present invention in detail, however, the present invention is not limited to the specific details of the above embodiments. Within the scope of the claims and the technical idea of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
Claims (7)
1. A low-temperature control flue gas denitration system is characterized by comprising a denitration assembly, an oxidation reaction assembly and a temperature control assembly; the denitration component comprises a washing tower and an atomization spray gun; the oxidation reaction component comprises an ozone generator, an ozone delivery pipe and an ozone mixer which are connected in sequence; the temperature control assembly comprises an air inlet pipe and a temperature sensor; the washing tower is connected with a smoke purifying pipe, the ozone mixer is arranged on the smoke purifying pipe, the air inlet pipe is communicated with the smoke purifying pipe, and the temperature sensor is arranged in the smoke purifying pipe; and an electric valve is arranged on the air inlet pipe.
2. The low-temperature-control flue gas denitration system according to claim 1, wherein the air inlet pipe is connected to the smoke cleaning pipe on the side of the ozone mixer far away from the washing tower, and the temperature sensor is located in the smoke cleaning pipe between the air inlet pipe and the ozone mixer.
3. The low-temperature-control flue gas denitration system of claim 1, wherein the ozone conveying pipe is provided with a stop valve, a filter and a flowmeter.
4. The low-temperature-control flue gas denitration system of claim 1, wherein a nitrogen oxide detection device is arranged at the top of the washing tower.
5. The low-temperature-control flue gas denitration system according to claim 1, wherein a liquid collecting tank is arranged at the bottom of the washing tower.
6. The low-temperature-control flue gas denitration system of claim 1, wherein a gas transmission pump is arranged on the air inlet pipe.
7. The low-temperature-control flue gas denitration system according to claim 1, wherein at least two groups of the atomizing spray guns are arranged in the washing tower along the vertical direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220217654.XU CN217068347U (en) | 2022-01-26 | 2022-01-26 | Low-temperature control flue gas denitration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220217654.XU CN217068347U (en) | 2022-01-26 | 2022-01-26 | Low-temperature control flue gas denitration system |
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