Denitration treatment device for incinerator

Abstract

The utility model relates to incinerator tail gas treatment technical field, especially in kind of incinerator denitration treatment device, including spray gun, reducing agent system and air help mixing system, the spray gun is installed on incinerator, and is connected with air help mixing system, still include the gas detector of installation in chimney exhaust port and install first temperature detector in incinerator hearth, the reducing agent system includes reducing agent unit, liquid inlet pipeline, atomization unit, control unit and first cut -out valve, the reducing agent unit is connected with spray gun through liquid inlet pipeline, atomization unit, control unit and first cut -out valve are installed on liquid inlet pipeline along liquid inlet direction in proper order, first temperature detector is respectively interlocked atomization unit and first cut -out valve, the gas detector is respectively interlocked atomization unit, control unit and first cut -out valve, the utility model discloses simple design, high degree of automation, manufacture and invest cost are low, high security, and the effect of good and stable denitration.

Description

Technical Field

[0001] This utility model relates to the field of incinerator exhaust gas treatment technology, and in particular to an incinerator denitrification treatment device. Background Technology

[0002] When an incinerator is in operation, it produces a large amount of flue gas, which contains a large amount of nitrogen oxides (including NO, NO2, etc., collectively referred to as NO). X Flue gas requires denitrification treatment, and the denitrification treatment technology usually adopts selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR).

[0003] Selective non-catalytic reduction refers to the selective reduction reaction of nitrogen oxides in flue gas with ammonia water or urea solution containing amino groups (NH3) as a reducing agent at a certain temperature without the use of a catalyst, thereby generating non-toxic and non-polluting N2 and water.

[0004] Currently, most SNCR denitrification systems are relatively complex in design, resulting in high manufacturing costs. Since the reaction temperature range between the reducing agent and nitrogen oxides is 850–1100℃, the higher the reaction temperature, the better the nitrogen oxide removal rate. However, if the reaction temperature is too high, NH3 will be oxidized, reducing the denitrification rate; if the reaction temperature is too low, the flue gas denitrification reaction will be incomplete, easily leading to NH3 escape. However, existing SNCR denitrification systems still spray reducing agent solution into the incinerator when the reaction temperature is too high or too low, resulting in unstable denitrification rates and NH3 escape, affecting the denitrification effect and wasting reducing agent. Furthermore, the feed rate of the reducing agent solution in existing SNCR denitrification systems is not adjusted in real time according to the nitrogen oxide concentration at the chimney emission point. Even when the nitrogen oxide concentration at the chimney emission point has reached the emission requirements of environmental regulations, the reducing agent solution is still sprayed into the incinerator at a fixed feed rate, which is not conducive to reducing agent conservation and brings cost pressure. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a denitrification treatment device for incinerators that is simple in design, highly automated, low in manufacturing cost, highly safe, and has good and stable denitrification effect.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a denitrification treatment device for an incinerator, comprising a spray gun, a reducing agent system, and an air mixing system. The spray gun is installed on the incinerator and connected to the air mixing system. It also includes a gas detector installed at the chimney exhaust port and a first temperature detector installed in the incinerator furnace. The reducing agent system includes a reducing agent unit, a liquid inlet pipeline, an atomizing unit, a control unit, and a first shut-off valve. The reducing agent unit is connected to the spray gun through the liquid inlet pipeline. The atomizing unit, the control unit, and the first shut-off valve are sequentially installed on the liquid inlet pipeline along the liquid inlet direction. The first temperature detector is interlocked with the atomizing unit and the first shut-off valve, and the gas detector is interlocked with the atomizing unit, the control unit, and the first shut-off valve.

[0007] Furthermore, the atomizing unit includes an atomizing pump, a first check valve, a first pressure detector, and a first ball valve. The atomizing pump, the first check valve, and the first pressure detector are sequentially installed on the inlet pipeline along the liquid inlet direction. The first ball valve is installed on the inlet pipeline and is respectively located on the right side of the atomizing pump and between the first check valve and the first pressure detector.

[0008] Furthermore, the control unit includes a flow detector, a first regulating valve, and a second ball valve. The flow detector and the first regulating valve are installed sequentially along the liquid inlet direction on the liquid inlet pipeline, and the second ball valve is installed on the liquid inlet pipeline, respectively located on the right side of the flow detector and the left side of the first regulating valve.

[0009] Furthermore, the reducing agent unit includes a mixing tank, an inlet pipeline, a delivery module, a water inlet pipeline, a control module, and a second shut-off valve. The mixing tank is connected to the spray gun via the liquid inlet pipeline, and the inlet pipeline is connected to the mixing tank for feeding the reducing agent. The delivery module is installed on the inlet pipeline. The water inlet pipeline is connected to the mixing tank for feeding the diluent. The control module and the second shut-off valve are sequentially installed on the water inlet pipeline along the liquid inlet direction.

[0010] Furthermore, the reducing agent unit also includes a level detector and a concentration detector installed on the mixing tank. The level detector is interlocked with the delivery module, the second shut-off valve and the atomization unit respectively, and the concentration detector is interlocked with the second shut-off valve.

[0011] Furthermore, the reducing agent unit also includes an emergency discharge line and a safety breathing valve, wherein the emergency discharge line is connected to the mixing tank and the safety breathing valve is installed on the emergency discharge line.

[0012] Furthermore, the conveying module includes a conveying pump, a second check valve, and a third ball valve. The conveying pump and the second check valve are sequentially installed on the inlet pipeline along the inlet direction. The third ball valve is installed on the inlet pipeline and is respectively located on the right side of the conveying pump and the upper side of the second check valve. The control module includes a second regulating valve and a fourth ball valve. The second regulating valve and the fourth ball valve are installed on the water inlet pipeline. The fourth ball valve is respectively located on the left and right sides of the second check valve.

[0013] Furthermore, the reducing agent system also includes a reflux pipeline, on which a fifth ball valve is installed. One end of the reflux pipeline is connected to the mixing tank, and the other end is connected to the atomizing unit.

[0014] Furthermore, the mixing tank is equipped with a stirring mechanism for stirring the reducing agent solution inside the mixing tank.

[0015] Furthermore, the air mixing system includes an intake pipe, a pressure reducing valve, a second pressure detector, a third check valve, and a sixth ball valve. The intake pipe is connected to the spray gun and is used to input compressed air. The pressure reducing valve, the second pressure detector, and the third check valve are installed sequentially on the intake pipe along the intake direction. The sixth ball valve is installed on the intake pipe and is respectively located on the right side of the pressure reducing valve and the left side of the third check valve.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model installs a first temperature detector in the furnace of the incinerator, and the first temperature detector is interlocked with the atomization unit and the first shut-off valve respectively. When the first temperature detector detects over-temperature or under-temperature, the atomization unit and the first shut-off valve are closed, so that the reducing agent solution stops feeding and waits for the reaction temperature to return to the range of 850-1100℃ before the feeding is restarted. At the same time, a gas detector is installed at the exhaust port of the chimney, and the gas detector is interlocked with the atomization unit, the control unit and the first shut-off valve respectively. The gas detector detects the nitrogen oxide concentration at the exhaust port, and the control unit controls the amount of reducing agent solution fed in real time. When the nitrogen oxide concentration at the exhaust port is within the emission requirements of environmental protection regulations, the control unit reduces the amount of reducing agent solution fed. The design is simple, fully automated, low manufacturing cost, and has good and stable denitrification effect.

[0018] (2) This utility model installs a liquid level detector and a concentration detector on the mixing tank, and the liquid level detector is interlocked with the delivery module, the second shut-off valve and the atomization unit respectively. The concentration detector is interlocked with the second shut-off valve to ensure the stability of the liquid level and the concentration of the reducing agent solution in the mixing tank. This avoids the pressure safety problem caused by excessive reducing agent solution in the mixing tank, and at the same time ensures that a sufficient amount and stable concentration of reducing agent solution is delivered to the spray gun to ensure the denitrification rate.

[0019] (3) This utility model is connected to the mixing tank through an emergency discharge pipeline, and a safety breathing valve is installed on the emergency discharge pipeline. When the pressure inside the mixing tank exceeds the limit, the safety breathing valve opens and the mixture is discharged through the emergency discharge pipeline, further ensuring safety.

[0020] (4) This utility model connects the mixing tank and the atomizing unit through the return pipeline, thereby realizing the pressure regulation of the atomizing pump in the atomizing unit. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the reducing agent system in this utility model;

[0024] Figure 3 This is a schematic diagram of the reducing agent unit in this utility model;

[0025] Figure 4 This is a schematic diagram of the air-mixing system in this utility model.

[0026] In the diagram: 100, First temperature detector; 200, Reducing agent unit; 210, Mixing tank; 220, Inlet pipeline; 230, Delivery module; 231, Delivery pump; 232, Second check valve; 240, Water inlet pipeline; 250, Control module; 251, Second regulating valve; 260, Second shut-off valve; 270, Liquid level detector; 280, Concentration detector; 290, Emergency discharge pipeline; 300, Liquid inlet pipeline; 400, Atomizing unit; 410, Atomizing pump; 420, First check valve; 430, First pressure detector; 500, Control unit; 510, Flow detector; 520, First regulating valve; 600, First shut-off valve; 700, Return pipeline; 800, Air inlet pipeline; 900, Pressure reducing valve; 1000, Second pressure detector; 1100, Third check valve; 1200, Overpass. Detailed Implementation

[0027] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0028] Example 1

[0029] like Figure 1 and Figure 2As shown, an incinerator denitrification treatment device includes a spray gun, a reducing agent system, an air mixing system, a gas detector, and a first temperature detector 100. The spray gun is installed on the incinerator and connected to the air mixing system. The gas detector (not shown) is installed at the chimney exhaust port, and the first temperature detector 100 is installed in the incinerator furnace. The reducing agent system includes a reducing agent unit 200, a liquid inlet pipe 300, an atomizing unit 400, a control unit 500, and a first shut-off valve 600. The reducing agent unit 200 is connected to the spray gun through the liquid inlet pipe 300. The atomizing unit 400, the control unit 500, and the first shut-off valve 600 are sequentially installed on the liquid inlet pipe 300 along the liquid inlet direction. The first temperature detector 100 interlocks the atomizing unit 400 and the first shut-off valve 600, and the gas detector interlocks the atomizing unit 400, the control unit 500, and the first shut-off valve 600.

[0030] A first temperature detector 100 is installed in the incinerator furnace, and the first temperature detector 100 is interlocked with the atomization unit 400 and the first shut-off valve 600. When the first temperature detector 100 detects over-temperature (above 1100℃) or under-temperature (below 850℃), the atomization unit 400 and the first shut-off valve 600 are shut off, causing the reducing agent solution to stop feeding. Feeding is restarted only after the reaction temperature returns to the range of 850-1100℃. At the same time, a gas detector is installed at the chimney exhaust port, and the gas detector is interlocked with the atomization unit 400, the control unit 500, and the first shut-off valve 600. The gas detector detects the nitrogen oxide concentration at the exhaust port, and the control unit 500 controls the reducing agent solution feed rate in real time. When the nitrogen oxide concentration at the exhaust port is within the emission requirements of environmental regulations, the control unit 500 reduces the reducing agent solution feed rate. The design is simple, fully automated, has low manufacturing input costs, and provides good and stable denitrification effect.

[0031] Specifically, the incinerator is equipped with a denitrification pre-installed interface; the spray gun is located in the denitrification zone inside the incinerator furnace; and the reducing agent solution is urea solution.

[0032] like Figure 2 As shown, the atomizing unit 400 includes an atomizing pump 410, a first check valve 420, a first pressure detector 430, and a first ball valve. The atomizing pump 410, the first check valve 420, and the first pressure detector 430 are sequentially installed on the inlet pipe 300 along the liquid inlet direction. The first ball valve is installed on the inlet pipe 300 and is respectively located on the right side of the atomizing pump 410 and between the first check valve 420 and the first pressure detector 430. Specifically, the atomizing pump 410 is interlocked with the gas detector and the first temperature detector 100.

[0033] The first pressure detector 430 is used to monitor the pressure of the outlet pipeline of the atomizing pump 410. When the pressure is too high (0.7MPa) or too low (0.1MPa), an alarm is issued so that personnel can respond in a timely manner.

[0034] like Figure 2 As shown, the control unit 500 includes a flow detector 510, a first regulating valve 520, and a second ball valve. The flow detector 510 and the first regulating valve 520 are sequentially installed on the inlet pipe 300 along the liquid inlet direction. The second ball valve is installed on the inlet pipe 300 and is respectively located to the right of the flow detector 510 and to the left of the first regulating valve 520. Specifically, the first regulating valve 520 is interlocked with a gas detector.

[0035] The flow detector 510 is used to monitor the flow rate of the outlet pipeline of the atomizing pump 410. When the flow rate is lower than the set value, an alarm is issued so that personnel can respond in a timely manner.

[0036] like Figure 2 and Figure 3 As shown, the reducing agent unit 200 includes a mixing tank 210, an inlet pipe 220, a delivery module 230, a water inlet pipe 240, a control module 250, and a second shut-off valve 260. The mixing tank 210 is connected to the spray gun via the liquid inlet pipe 300. The inlet pipe 220 is connected to the mixing tank 210 and is used to deliver the reducing agent. The delivery module 230 is installed on the inlet pipe 220. The water inlet pipe 240 is connected to the mixing tank 210 and is used to deliver the diluent. The control module 250 and the second shut-off valve 260 are installed sequentially on the water inlet pipe 240 along the liquid inlet direction.

[0037] Specifically, the mixing tank 210 is equipped with electric heat tracing and a second temperature detector. The reducing agent solution in the mixing tank 210 is heated by electric heat tracing, and the temperature is detected by the second temperature detector, so that the temperature of the reducing agent solution in the mixing tank 210 and pipeline is controlled within the range of 25-35℃, preventing crystallization of the reducing agent solution in the mixing tank 210 and pipeline. The diluent is demineralized water, which reduces equipment corrosion and scaling.

[0038] like Figure 3 As shown, the conveying module 230 includes a conveying pump 231, a second check valve 232 and a third ball valve. The conveying pump 231 and the second check valve 232 are installed sequentially on the feed pipeline 220 along the feed direction. The third ball valve is installed on the feed pipeline 220 and is respectively located on the right side of the conveying pump 231 and the upper side of the second check valve 232.

[0039] like Figure 2 and Figure 3As shown, the control module 250 includes a second regulating valve 251 and a fourth ball valve. The second regulating valve 251 and the fourth ball valve are installed on the water inlet pipe 240. The fourth ball valve is respectively located on the left and right sides of the second check valve 232.

[0040] like Figure 3 As shown, the reducing agent unit 200 also includes a level detector 270 and a concentration detector 280 installed on the mixing tank 210. The level detector 270 is interlocked with the delivery module 230, the second shut-off valve 260, and the atomizing unit 400, respectively, and the concentration detector 280 is interlocked with the second shut-off valve 260. Specifically, the level detector 270 is interlocked with the delivery pump 231 and the atomizing pump 410, respectively.

[0041] By installing a level detector 270 and a concentration detector 280 on the mixing tank 210, with the level detector 270 interlocking with the delivery module 230, the second shut-off valve 260, and the atomizing unit 400, and the concentration detector 280 interlocking with the second shut-off valve 260, the level and concentration of the reducing agent solution in the mixing tank 210 are kept stable. This avoids pressure safety issues caused by excessive reducing agent solution in the mixing tank 210, and ensures that a sufficient amount of reducing agent solution with a stable concentration is delivered to the spray gun, thus guaranteeing the denitrification rate.

[0042] When the level detector 270 detects that the reducing agent solution in the mixing tank 210 is at a high level, it interlocks and shuts off the delivery pump 231 and the second shut-off valve 260, stopping the feeding into the mixing tank 210. If the level is at a low level, it interlocks and shuts off the atomizing pump 410, stopping the discharging from the mixing tank 210. When the concentration detector 280 detects that the concentration of the reducing agent solution in the mixing tank 210 is lower than the set value, it interlocks and shuts off the second shut-off valve 260, stopping the replenishment of diluent.

[0043] like Figure 3 As shown, the reducing agent unit 200 also includes an emergency discharge line 290 and a safety breathing valve. The emergency discharge line 290 is connected to the mixing tank 210, and the safety breathing valve is installed on the emergency discharge line 290.

[0044] The emergency discharge line 290 is connected to the mixing tank 210, and a safety breather valve is installed on the emergency discharge line 290. When the pressure inside the mixing tank 210 exceeds the limit, the safety breather valve opens, and the pressure is discharged through the emergency discharge line 290 to further ensure safety.

[0045] Specifically, the emergency discharge pipeline 290 is connected to the activated carbon adsorption device. After emergency discharge through the emergency discharge pipeline 290, the treated material is processed by the activated carbon adsorption device, which meets the requirements for safe and environmentally friendly discharge.

[0046] like Figure 2As shown, the reducing agent system also includes a reflux line 700, on which a fifth ball valve is installed. One end of the reflux line 700 is connected to the mixing tank 210, and the other end is connected to the atomizing unit 400. Specifically, the other end of the reflux line 700 is connected to the inlet line 300 between the first check valve 420 and the first pressure detector 430.

[0047] The mixing tank 210 is connected to the atomizing unit 400 through the return pipe 700, thereby enabling pressure regulation of the atomizing pump 410 in the atomizing unit 400.

[0048] like Figure 4 As shown, the air mixing system includes an intake pipe 800, a pressure reducing valve 900, a second pressure detector 1000, a third check valve 1100, and a sixth ball valve. The intake pipe 800 is connected to the spray gun and is used to input compressed air. The pressure reducing valve 900, the second pressure detector 1000, and the third check valve 1100 are installed sequentially on the intake pipe 800 along the intake direction. The sixth ball valve is installed on the intake pipe 800 and is respectively located on the right side of the pressure reducing valve 900 and the left side of the third check valve 1100.

[0049] To ensure the stability and safety of the device's operation, an atomization backup unit is connected in parallel to the atomization unit 400, and overpass bypasses 1200 are connected in parallel to the control unit 500 and the control module 250, respectively. The atomization backup unit is interlocked with the first temperature detector 100 and the gas detector. The design of the atomization backup unit is the same as that of the atomization unit 400, and will not be described in detail here.

[0050] During operation, the reducing agent is added to the mixing tank 210 via the inlet pipe 220, while the diluent is injected into the mixing tank 210 via the water inlet pipe 240, forming a stable reducing agent solution within the mixing tank 210. When the first temperature detector 100 detects that the reaction temperature is within the range of 850–1100°C, the atomizing pump 410 and the first shut-off valve 600 are activated to deliver the reducing agent solution to the spray gun. Simultaneously, the air mixing system delivers compressed air to the spray gun, ensuring thorough mixing of the reducing agent solution and compressed air within the spray gun, resulting in a uniform mixture of the reducing agent solution sprayed from the spray gun with the flue gas. It should be noted that the interlocking in this application is controlled by a controller (such as a PLC system).

[0051] Example 2

[0052] As a further improvement to Embodiment 1, this embodiment includes a stirring mechanism (not shown in the figure) inside the mixing tank 210 for stirring the reducing agent solution inside the mixing tank 210, thereby keeping the reducing agent solution inside the mixing tank 210 uniform. The stirring mechanism can employ existing technology, and will not be described in detail here.

[0053] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A denitrification treatment device for an incinerator, comprising a spray gun, a reducing agent system, and an air mixing system, wherein the spray gun is installed on the incinerator and connected to the air mixing system; characterized in that: It also includes a gas detector installed at the chimney exhaust port and a first temperature detector (100) installed in the incinerator furnace; the reducing agent system includes a reducing agent unit (200), a liquid inlet pipe (300), an atomizing unit (400), a control unit (500) and a first shut-off valve (600), the reducing agent unit (200) is connected to the spray gun through the liquid inlet pipe (300), the atomizing unit (400), the control unit (500) and the first shut-off valve (600) are installed sequentially on the liquid inlet pipe (300) along the liquid inlet direction; the first temperature detector (100) interlocks the atomizing unit (400) and the first shut-off valve (600) respectively, and the gas detector interlocks the atomizing unit (400), the control unit (500) and the first shut-off valve (600) respectively.

2. The incinerator denitrification treatment device according to claim 1, characterized in that: The atomizing unit (400) includes an atomizing pump (410), a first check valve (420), a first pressure detector (430), and a first ball valve. The atomizing pump (410), the first check valve (420), and the first pressure detector (430) are installed sequentially on the inlet pipe (300) along the liquid inlet direction. The first ball valve is installed on the inlet pipe (300) and is respectively located on the right side of the atomizing pump (410) and between the first check valve (420) and the first pressure detector (430).

3. The incinerator denitrification treatment device according to claim 1, characterized in that: The control unit (500) includes a flow detector (510), a first regulating valve (520), and a second ball valve. The flow detector (510) and the first regulating valve (520) are installed sequentially on the inlet pipe (300) along the liquid inlet direction. The second ball valve is installed on the inlet pipe (300) and is respectively located on the right side of the flow detector (510) and the left side of the first regulating valve (520).

4. The incinerator denitrification treatment device according to claim 1, characterized in that: The reducing agent unit (200) includes a mixing tank (210), an inlet pipeline (220), a delivery module (230), a water inlet pipeline (240), a control module (250), and a second shut-off valve (260). The mixing tank (210) is connected to the spray gun via a liquid inlet pipeline (300). The inlet pipeline (220) is connected to the mixing tank (210) and is used to deliver the reducing agent. The delivery module (230) is installed on the inlet pipeline (220). The water inlet pipeline (240) is connected to the mixing tank (210) and is used to deliver the diluent. The control module (250) and the second shut-off valve (260) are installed sequentially on the water inlet pipeline (240) along the liquid inlet direction.

5. The incinerator denitration treatment device according to claim 4, characterized by: The reducing agent unit (200) also includes a level detector (270) and a concentration detector (280) installed on the mixing tank (210). The level detector (270) is interlocked with the delivery module (230), the second shut-off valve (260) and the atomizing unit (400), respectively. The concentration detector (280) is interlocked with the second shut-off valve (260).

6. The incinerator denitration treatment device according to claim 4, characterized by: The reducing agent unit (200) also includes an emergency discharge line (290) and a safety breathing valve. The emergency discharge line (290) is connected to the mixing tank (210), and the safety breathing valve is installed on the emergency discharge line (290).

7. The incinerator denitrification treatment device according to claim 4, characterized in that: The delivery module (230) includes a delivery pump (231), a second check valve (232), and a third ball valve. The delivery pump (231) and the second check valve (232) are installed sequentially on the inlet pipeline (220) along the inlet direction. The third ball valve is installed on the inlet pipeline (220) and is respectively located on the right side of the delivery pump (231) and the upper side of the second check valve (232). The control module (250) includes a second regulating valve (251) and a fourth ball valve. The second regulating valve (251) and the fourth ball valve are installed on the water inlet pipeline (240). The fourth ball valve is respectively located on the left and right sides of the second check valve (232).

8. The incinerator denitration treatment device according to claim 4, characterized by: The reducing agent system also includes a reflux line (700) on which a fifth ball valve is installed. One end of the reflux line (700) is connected to the mixing tank (210), and the other end is connected to the atomizing unit (400).

9. The incinerator denitration treatment device according to claim 4, characterized by: The mixing tank (210) is equipped with a stirring mechanism for stirring the reducing agent solution inside the mixing tank (210).

10. The incinerator denitration treatment device according to claim 1, characterized by: The air mixing system includes an intake pipe (800), a pressure reducing valve (900), a second pressure detector (1000), a third check valve (1100), and a sixth ball valve. The intake pipe (800) is connected to the spray gun and is used to input compressed air. The pressure reducing valve (900), the second pressure detector (1000), and the third check valve (1100) are installed sequentially on the intake pipe (800) along the intake direction. The sixth ball valve is installed on the intake pipe (800) and is respectively located on the right side of the pressure reducing valve (900) and the left side of the third check valve (1100).

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