Denitration device for urea raw material

Abstract

The utility model relates to the technical field of denitration devices, in particular to a denitration device for urea raw materials. According to the technical scheme, the system comprises a denitration system, an injection system is installed in the denitration system, the injection system comprises a flow regulating valve and a plurality of spray guns connected with the flow regulating valve, the system further comprises a blocking detection mechanism installed on the spray guns, and the blocking detection mechanism detects the pressure relief speed in the spray guns and judges the blocking conditions of the spray guns. According to the utility model, the problems of reduction of solution spraying uniformity and reduction of denitration efficiency caused by blockage of the spray gun can be effectively prevented, the reduction of solution flow passing through the spray gun is prevented, and the abnormal operation of a denitration system is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to denitration device technical field especially relates to a kind of denitration devices for urea raw material. BACKGROUND

[0002] Urea is an organic compound with high nitrogen content, widely used in agriculture as fertilizer, as well as in industry and other fields. Denitration of urea raw material is mainly achieved through selective non-catalytic reduction technology. First, urea particles are dissolved in water to prepare a urea solution of a certain concentration. The urea solution is delivered to the appropriate location of the boiler or industrial furnace by a metering pump. And use the spray gun to atomize the urea solution, and spray it into the flue gas. In the appropriate temperature window in the boiler or hearth, the urea solution droplets rapidly thermally decompose into ammonia and isocyanic acid. The ammonia produced reacts chemically with nitrogen oxides in the flue gas, reducing the nitrogen oxides to nitrogen and water.

[0003] Impurities in urea solution or ammonia water can cause fouling or deposition inside the spray gun, causing blockage. And if the water used is of poor quality, containing more minerals and suspended solids, it may form deposits inside the spray gun, causing blockage. Blockage of the spray gun can affect the uniformity of the solution spray, leading to a decrease in denitration efficiency. Blockage reduces the flow of solution through the spray gun, affecting the normal operation of the denitration system. SUMMARY

[0004] The utility model aims at the problems in the background art, and provides a kind of denitration devices for urea raw material.

[0005] The technical scheme of the utility model: a kind of denitration devices for urea raw material, including denitration system, install in the denitration system with injection system, the injection system includes flow regulating valve and multiple spray guns connected with flow regulating valve, further include:

[0006] The plugging detection mechanism is installed on the spray gun, which detects the pressure relief speed inside the spray gun and judges the plugging condition of the spray gun.

[0007] Optionally, the spray gun includes a fixed sleeve, an atomizing nozzle is fixedly installed on the fixed sleeve, a connection valve is fixedly installed on the fixed sleeve, a liquid connector and a compressed air connector are provided on the connection valve.

[0008] Optionally, the plugging detection mechanism includes a sliding cylinder fixedly installed on the connection valve and communicating with the inside of the connection valve, a pressure receiving port is provided at one end of the sliding cylinder inside the connection valve, a pressure block is slidingly installed in the sliding cylinder, a sealing ring is fixedly installed on the pressure block, a pressure rod is fixedly installed on the pressure block, and one end of the pressure rod penetrates through the sliding cylinder and extends to the outside of the sliding cylinder.

[0009] Optionally, the plugging detection mechanism further comprises a connecting block fixedly installed on the pressing rod, a first spring fixedly installed on the connecting block, the other end of the first spring being fixedly connected with the sliding cylinder, a supporting plate fixedly installed on the connecting block, a plurality of pawls rotatably installed on the supporting plate, a ratchet wheel rotatably installed on the fixed sleeve, and a detection box coaxially fixedly installed on the ratchet wheel, a detection assembly for judging whether the atomizing nozzle is plugged according to the rotating speed of the ratchet wheel being installed in the detection box.

[0010] Optionally, the detection assembly comprises a sliding rod slidingly installed in the detection box, a second spring fixedly installed on the sliding rod, the other end of the second spring being fixedly connected with the detection box, a first copper plate fixedly installed on the sliding rod, a second copper plate fixedly installed in the detection box, a closed circuit being arranged on the first copper plate and the second copper plate, and a counterweight fixedly installed on the first copper plate.

[0011] Optionally, a power supply is fixedly installed in the detection box, the positive electrode of the power supply being electrically connected with the first copper plate, the negative electrode of the power supply being fixedly installed with a first wire, one end of the first wire being electrically connected with an indicating lamp, the indicating lamp being fixedly installed with a second wire, and the second wire being electrically connected with the second copper plate.

[0012] Optionally, the denitration system comprises a boiler, an economizer fixedly installed in the boiler, the spray gun being fixedly installed in the boiler, a static mixer fixedly installed above the spray gun, a guide plate fixedly installed in the boiler, a catalyst fixedly installed below the guide plate, an SCR reactor fixedly installed below the catalyst, a supply fan and an air preheater fixedly installed outside the boiler, a supply pipe fixedly installed in the air preheater, one end of the supply pipe being fixedly connected with the supply fan and the other end being fixedly connected with the boiler, and a discharge pipe fixedly installed on the SCR reactor, the discharge pipe passing through the air preheater and being sequentially connected with a dust remover and a desulfurization device.

[0013] To sum up, the present application has at least one of the following beneficial technical effects:

[0014] The plugging detection mechanism can intuitively judge whether the spray gun is plugged, the working state of the spray gun can be timely connected, the spray gun can be timely maintained, the problem that the uniformity of solution spraying is reduced due to the plugging of the spray gun and the problem that the denitration efficiency is reduced can be effectively prevented, the solution flow through the spray gun is prevented from being reduced, and the abnormal operation of the denitration system is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a structural schematic view of a denitration system;

[0016] Figure 2 Fig. 2 is a structural schematic view of a spray gun;

[0017] Figure 3 is a structural schematic diagram of the inside of the sliding cylinder;

[0018] Figure 4 is Figure 3 is a partial enlarged view at A in the middle;

[0019] Figure 5 is a circuit diagram of the indicator light.

[0020] Reference signs: 1, boiler; 101, coal economizer; 102, spray gun; 103, static mixer; 104, guide plate; 105, catalyst; 106, SCR reactor; 107, air blower; 108, air preheater; 109, air supply pipe; 110, exhaust pipe; 2, flow regulating valve; 3, fixed sleeve; 301, atomizing nozzle; 302, connecting valve; 303, liquid connecting head; 304, compressed air connecting head; 4, sliding cylinder; 401, pressure receiving port; 402, pressing block; 403, sealing ring; 404, pressing rod; 405, connecting block; 406, first spring; 407, support plate; 408, pawl; 409, ratchet wheel; 410, detection box; 411, sliding rod; 412, second spring; 413, first copper plate; 414, second copper plate; 415, indicator light; 416, power supply; 417, second lead wire; 418, first lead wire; 419, counterweight. DETAILED DESCRIPTION

[0021] The technical scheme of the utility model will be further described below in combination with the drawings and specific embodiments.

[0022] As Figures 1 to 5 shown, the utility model provides a kind of urea raw material is with denitration device, including denitration system, denitration system includes boiler 1, coal economizer 101 being fixedly installed in boiler 1, spray gun 102 is fixedly installed in boiler 1 interior, static mixer 103 is fixedly installed on spray gun 102 upper side, guide plate 104 is fixedly installed in boiler 1, catalyst 105 is fixedly installed in guide plate 104 lower side, SCR reactor 106 is fixedly installed in catalyst 105 lower side, air blower 107 and air preheater 108 are fixedly installed outside boiler 1, air preheater 108 is fixed with air supply pipe 109, one end of air supply pipe 109 is fixedly connected with air blower 107, and the other end is fixedly connected with boiler 1, exhaust pipe 110 is fixedly installed on SCR reactor 106, exhaust pipe 110 passes through air preheater 108 and is sequentially connected with dust collector and desulfurization equipment (this is prior art, and here is not described in detail).

[0023] The denitrification system is equipped with an injection system, which includes a flow regulating valve 2 and multiple spray guns 102 connected to the flow regulating valve 2. The injection system mixes urea raw material into a liquid and sprays it out through the spray guns 102 (this is existing technology and will not be described in detail here).

[0024] The denitrification device in this embodiment also includes a clogging detection mechanism installed on the spray gun 102. The clogging detection mechanism detects the pressure relief rate inside the spray gun 102 and determines the clogging status of the spray gun 102. The clogging detection mechanism can quickly determine the clogging status of the spray gun 102 and determine whether it is necessary to stop the machine to clean the spray gun 102 based on the clogging status.

[0025] The spray gun 102 includes a fixed sleeve 3, on which an atomizing nozzle 301 is fixedly mounted. A connecting valve 302 is also fixedly mounted on the fixed sleeve 3, and the connecting valve 302 has a liquid connector 303 and a compressed air connector 304. The liquid formed from the urea raw material enters the connecting valve 302 through the liquid connector 303, and the high-pressure gas enters the connecting valve 302 through the compressed air connector 304. Subsequently, the liquid formed from the urea raw material is atomized and sprayed out through the atomizing nozzle 301.

[0026] Furthermore, the sealing detection mechanism includes a slide cylinder 4 fixedly installed on the connecting valve 302 and communicating with the interior of the connecting valve 302. One end of the slide cylinder 4, inside the connecting valve 302, has a pressure port 401. A pressure block 402 is slidably installed inside the slide cylinder 4. A sealing ring 403 is fixedly installed on the pressure block 402, and a pressure rod 404 is fixedly installed on the pressure block 402. The pressure rod 404 passes through one end of the slide cylinder 4 and extends to the outside of the slide cylinder 4. When high-pressure gas enters the connecting valve 302, it will increase the gas pressure inside the connecting valve 302. The increased gas pressure will exert a thrust on the pressure block 402. At this time, the pressure block 402, affected by the gas pressure, will move inside the slide cylinder 4. The moving slide cylinder 4 will then drive the pressure rod 404 to move.

[0027] Furthermore, the sealing detection mechanism also includes a connecting block 405 fixedly installed on the pressure rod 404. A first spring 406 is fixedly installed on the connecting block 405. The other end of the first spring 406 is fixedly connected to the slide cylinder 4. When the pressure rod 404 moves outward, it will compress the first spring 406. When the air pressure inside the connecting valve 302 is released through the atomizing nozzle 301, the pressure block 402 will be reset under the action of the first spring 406. Since the pressure release speed inside the connecting valve 302 will also slow down as the atomizing nozzle 301 is gradually blocked, the reset speed of the pressure block 402 will also slow down. Therefore, the sealing status of the atomizing nozzle 301 can be judged based on the reset speed of the pressure block 402.

[0028] A support plate 407 is fixedly mounted on the connecting block 405. Multiple pawls 408 are rotatably mounted on the support plate 407. A ratchet 409 is rotatably mounted on the fixing sleeve 3. The pawls 408 and ratchet 409 cooperate with each other, allowing the pawls 408 to reciprocate and drive the ratchet 409 to move unidirectionally. This prevents the ratchet 409 from rotating when the pressure block 402 moves against the first spring 406. When the first spring 406 resets the pressure block 402, the pawls 408 will push the ratchet 409 to move. A detection box 410 is coaxially fixedly mounted on the ratchet 409. The detection box 410 contains a detection component that determines whether the atomizing nozzle 301 is blocked based on the rotation speed of the ratchet 409. The detection box 410 rotates with the rotation of the ratchet 409.

[0029] In this embodiment, the detection component includes a slide rod 411 slidably installed inside the detection box 410, a second spring 412 fixedly installed on the slide rod 411, the other end of the second spring 412 being fixedly connected to the detection box 410, a first copper plate 413 fixedly installed on the slide rod 411, a second copper plate 414 fixedly installed inside the detection box 410, a closed circuit being provided on the first copper plate 413 and the second copper plate 414, and a counterweight 419 fixedly installed on the first copper plate 413. When the detection box 410 rotates, it will drive the first copper plate 413 to rotate as well. Under the action of centrifugal force, the rotating first copper plate 413 will move towards the second copper plate 414 and stretch the second spring 412. When the first copper plate 413 and the second copper plate 414 come into contact, the circuit will be connected. Whether the first copper plate 413 can come into contact with the second copper plate 414 depends on the rotation speed of the detection box 410, which will affect the magnitude of the centrifugal force of the first copper plate 413. If the first copper plate 413 and the second copper plate 414 can come into contact, it means that the pressure block 402 can be quickly reset and the atomizing nozzle 301 is not blocked. Otherwise, it means that the atomizing nozzle 301 is blocked.

[0030] It is worth noting that a power supply 416 is fixedly installed inside the detection box 410. The positive terminal of the power supply 416 is electrically connected to the first copper plate 413. The negative terminal of the power supply 416 is fixedly installed with a first wire 418. One end of the first wire 418 is electrically connected to an indicator light 415. A second wire 417 is fixedly installed on the indicator light 415. The second wire 417 is electrically connected to the second copper plate 414. When the first copper plate 413 contacts the second copper plate 414, the power supply 416 supplies power to the indicator light 415, which can then be lit. The indicator light is positioned in a suitable and easily observable location. When the atomizing nozzle 301 is not blocked, the indicator light 415 flashes periodically. However, when the atomizing nozzle 301 is blocked, the indicator light 415 will never light up. This allows for a direct assessment of whether the spray gun 102 is blocked, enabling timely monitoring of the spray gun 102's operating status and timely maintenance. It effectively prevents spray gun blockage from reducing the uniformity of solution spraying, leading to a decrease in denitrification efficiency, and also prevents a reduction in the solution flow rate through the spray gun, thus avoiding abnormal operation of the denitrification system.

[0031] The working principle of this embodiment is as follows: the liquid formed from urea raw material will enter the connecting valve 302 through the liquid connector 303, and the high-pressure gas will enter the connecting valve 302 through the compressed air connector 304. Subsequently, the liquid formed from urea raw material will be atomized and sprayed out through the atomizing nozzle 301. When the high-pressure gas enters the connecting valve 302, it will increase the air pressure inside the connecting valve 302. The increased air pressure will generate a thrust on the pressure block 402. At this time, the pressure block 402 affected by the air pressure will move inside the slide cylinder 4. The moving slide cylinder 4 can drive the pressure rod 404 to move.

[0032] When the pressure rod 404 moves outward, it will compress the first spring 406. When the air pressure inside the connecting valve 302 is released through the atomizing nozzle 301, the pressure block 402 will be reset under the action of the first spring 406. As the atomizing nozzle 301 is gradually blocked, the pressure release speed inside the connecting valve 302 will also slow down, which will cause the reset speed of the pressure block 402 to slow down. Therefore, the blocking status of the atomizing nozzle 301 can be judged based on the reset speed of the pressure block 402.

[0033] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A denitrification device for urea feedstock, comprising a denitrification system, wherein an injection system is installed within the denitrification system, the injection system comprising a flow regulating valve (2) and a plurality of spray guns (102) connected to the flow regulating valve (2), characterized in that, Also includes: A plugging detection mechanism is installed on the spray gun (102). The plugging detection mechanism detects the pressure relief rate inside the spray gun (102) and determines the plugging status of the spray gun (102).

2. The denitrification device for urea feedstock according to claim 1, characterized in that, The spray gun (102) includes a fixed sleeve (3), on which an atomizing nozzle (301) is fixedly installed, and on which a connecting valve (302) is fixedly installed, and on which a liquid connector (303) and a compressed air connector (304) are provided.

3. The denitrification device for urea feedstock according to claim 2, characterized in that, The sealing detection mechanism includes a slide cylinder (4) fixedly installed on the connecting valve (302) and communicating with the inside of the connecting valve (302). The slide cylinder (4) has a pressure port (401) at one end inside the connecting valve (302). A pressure block (402) is slidably installed inside the slide cylinder (4). A sealing ring (403) is fixedly installed on the pressure block (402). A pressure rod (404) is fixedly installed on the pressure block (402). The pressure rod (404) passes through one end of the slide cylinder (4) and extends to the outside of the slide cylinder (4).

4. A denitrification device for urea feedstock according to claim 3, characterized in that, The sealing detection mechanism further includes a connecting block (405) fixedly installed on the pressure rod (404). A first spring (406) is fixedly installed on the connecting block (405). The other end of the first spring (406) is fixedly connected to the slide cylinder (4). A support plate (407) is fixedly installed on the connecting block (405). Multiple pawls (408) are rotatably installed on the support plate (407). A ratchet (409) is rotatably installed on the fixed sleeve (3). A detection box (410) is coaxially fixedly installed on the ratchet (409). A detection component for determining whether the atomizing nozzle (301) is blocked based on the rotation speed of the ratchet (409) is installed inside the detection box (410).

5. A denitrification device for urea feedstock according to claim 4, characterized in that, The detection assembly includes a slide rod (411) slidably mounted inside the detection box (410), a second spring (412) fixedly mounted on the slide rod (411), the other end of the second spring (412) being fixedly connected to the detection box (410), a first copper plate (413) fixedly mounted on the slide rod (411), a second copper plate (414) fixedly mounted inside the detection box (410), a closed circuit being provided on the first copper plate (413) and the second copper plate (414), and a counterweight (419) fixedly mounted on the first copper plate (413).

6. A denitrification device for urea feedstock according to claim 5, characterized in that, A power supply (416) is fixedly installed inside the detection box (410). The positive terminal of the power supply (416) is electrically connected to the first copper plate (413). A first wire (418) is fixedly installed on the negative terminal of the power supply (416). One end of the first wire (418) is electrically connected to an indicator light (415). A second wire (417) is fixedly installed on the indicator light (415). The second wire (417) is electrically connected to the second copper plate (414).

7. A denitrification device for urea feedstock according to claim 1, characterized in that, The denitrification system includes a boiler (1), an economizer (101) fixedly installed inside the boiler (1), a spray gun (102) fixedly installed inside the boiler (1), a static mixer (103) fixedly installed above the spray gun (102), a baffle plate (104) fixedly installed inside the boiler (1), a catalyst (105) fixedly installed below the baffle plate (104), and an SCR reactor (106) fixedly installed below the catalyst (105). A blower (107) and an air preheater (108) are fixedly installed on the outside of the boiler (1). An air supply pipe (109) is fixed inside the air preheater (108). One end of the air supply pipe (109) is fixedly connected to the blower (107) and the other end is fixedly connected to the boiler (1). A discharge pipe (110) is fixedly installed on the SCR reactor (106). The discharge pipe (110) passes through the air preheater (108) and is connected to the dust collector and desulfurization equipment in sequence.

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