A tail gas treatment device for high tower slow-release compound fertilizer

Abstract

The application relates to a high-tower slow-release compound fertilizer tail gas treatment device, which comprises a treatment tower, which has an acid pickling chamber and an alkali pickling chamber inside for tail gas treatment; two groups of spraying assemblies, the spraying assemblies comprising a flow guide pipe, a spraying pipe fitting and a booster pump, the flow guide pipe being arranged inside the treatment tower, the spraying pipe fitting being inserted into the flow guide pipe, and the booster pump being arranged on the treatment tower; and a flow pipeline, the flow pipeline comprising an adapter pipe, a condensing pipe fitting and a heating ring, two ends of the adapter pipe being respectively communicated with the acid pickling chamber and the alkali pickling chamber, the application can reduce the transmission distance of tail gas through the flow guide pipe, the spraying pipe fitting, the booster pump, the adapter pipe, the condensing pipe fitting and the heating ring, simultaneously performs acid pickling and alkali pickling on the tail gas, improves the tail gas treatment efficiency, and reduces the cost of matched equipment and pipelines.

Description

Technical Field

[0001] This application relates to the field of exhaust gas treatment technology, and in particular to a high-tower slow-release compound fertilizer exhaust gas treatment device. Background Technology

[0002] High-tower compound fertilizer (full name: high-tower granulation compound fertilizer) has received much attention in my country's agriculture, fertilizer manufacturing and related fields. It is one of the new technologies in my country's compound fertilizer production process. It is a melt granulation method for urea and potassium fertilizer. This fertilizer has the characteristics of uniform and smooth particles, melting pores and no caking.

[0003] Compound fertilizer production generates certain exhaust gases, which are complex in composition, mainly consisting of particulate matter, dust, and fine particles. The waste gas generated during compound fertilizer production mainly includes H2S, SO2, SO3, NO2, NH3, and H2O (gas). If the exhaust gases are discharged into the atmosphere without purification, they will cause environmental pollution and affect the health of surrounding residents.

[0004] Since the exhaust gas from compound fertilizer mainly consists of dust, particulate matter, and acid / alkali gases, existing technologies typically employ a combination of alkaline and acid washing to treat it. During this process, the exhaust gas enters an alkaline washing tower where acidic gases are removed by spraying with a neutralizing liquid. After drying and demisting, it is then transferred to an acid washing tower to remove alkaline gases. This process involves excessively long exhaust gas transport distances and numerous treatment steps, which not only reduces treatment efficiency but also requires a large amount of supporting equipment and pipelines, occupies significant land, and incurs high equipment costs. Furthermore, insufficient contact between the spray liquid and the exhaust gas reduces the overall treatment effect.

[0005] To address the aforementioned issues, a high-tower slow-release compound fertilizer exhaust gas treatment device is now designed. Summary of the Invention

[0006] This application provides a high-tower slow-release compound fertilizer tail gas treatment device to solve the problems in related technologies, such as excessive tail gas transportation distance, too many treatment steps, reduced treatment efficiency, large land occupation, and high equipment cost.

[0007] In a first aspect, a high-tower slow-release compound fertilizer tail gas treatment device is provided, comprising:

[0008] The treatment tower has an acid washing chamber and an alkaline washing chamber for tail gas treatment.

[0009] Two sets of spraying components are respectively installed inside the pickling chamber and the alkaline washing chamber;

[0010] The spray assembly includes a guide pipe, spray pipe fittings, and a booster pump. The guide pipe is installed inside the treatment tower, the spray pipe fittings are inserted into the guide pipe, and the booster pump is installed on the treatment tower, with the booster pump outlet pipe connected to the spray pipe fittings.

[0011] The flow pipe includes a transfer pipe, a condenser fitting, and a heating ring. The two ends of the transfer pipe are respectively connected to the pickling chamber and the alkaline washing chamber. The condenser fitting is disposed inside the transfer pipe, and the heating ring is disposed outside the transfer pipe.

[0012] In some embodiments, the guide tube includes an umbrella-shaped part and a rod part, the rod part is inserted into the umbrella-shaped part, the rod part is hollow and the two ends of the rod part are open, and the umbrella-shaped part is provided with a plurality of guide holes.

[0013] In some embodiments, the spray pipe includes a plurality of atomizing nozzles, and a supply pipe and a columnar pipe connected to each other. The top end of the supply pipe is connected to the treatment tower, and the bottom end of the columnar pipe is inserted into the rod. The plurality of atomizing nozzles are arranged in a ring on the columnar pipe.

[0014] In some embodiments, the transfer tube is shaped like a triangle, the heating ring is disposed on the side of the transfer tube near the pickling chamber, the condenser is disposed on the side of the transfer tube near the alkaline washing chamber, and the end of the transfer tube near the alkaline washing chamber is inclined upward.

[0015] In some embodiments, a first demister is provided inside the transfer pipe, and the first demister is located above the heating ring.

[0016] In some embodiments, the condenser fitting includes an interconnected hollow pipe and a support, the top of the support being connected to the inside of the adapter pipe, and two flow pipes being disposed opposite each other on the hollow pipe.

[0017] In some embodiments, a pretreatment tank is also included, the pretreatment tank comprising a shell and two sets of perforated metal mesh, the shell being disposed on the processing tower and communicating with the pickling chamber, the perforated metal mesh being inserted inside the shell;

[0018] The housing is equipped with an exhaust gas inlet pipe.

[0019] In some embodiments, an auxiliary mechanism is also included, comprising a housing, two sets of activated carbon filter layers, and a second demister. The housing is mounted on the treatment tower and communicates with the alkaline washing chamber. The activated carbon filter layers are inserted into the housing, and the second demister is located inside the housing and above the activated carbon filter layers.

[0020] This application provides a high-tower slow-release compound fertilizer tail gas treatment device. After the tail gas enters the acid washing chamber, it is guided and transported through the guide pipe. At the same time, the spray pipe fittings and the booster pump work together to remove the alkaline washing gas in the tail gas. After being transported through the flow pipe, the condenser fittings and the heating ring remove water droplets from the tail gas. Then it is sent to the alkaline washing chamber to remove the acidic gas inside. This can reduce the transmission distance of the tail gas. The treatment tower can simultaneously perform acid washing and alkaline washing on the tail gas, which makes the equipment more integrated. It not only improves the efficiency of tail gas treatment, but also reduces the cost of supporting equipment and pipelines, and reduces the land occupation area. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A three-dimensional structural cross-sectional view provided for an embodiment of this application;

[0023] Figure 2 This is a three-dimensional schematic diagram of the guide tube provided in an embodiment of this application;

[0024] Figure 3 This is a three-dimensional schematic diagram of the spray pipe fittings provided in the embodiments of this application;

[0025] Figure 4 A front sectional view provided for an embodiment of this application;

[0026] Figure 5 This is a front sectional view of the pretreatment tank provided in an embodiment of this application.

[0027] In the diagram: 1. Treatment tower; 1a. Acid washing chamber; 1b. Alkali washing chamber; 2. Spray assembly; 21. Guide pipe; 2a. Umbrella section; 2b. Rod section; 22. Spray fittings; 221. Supply pipe; 222. Columnar pipe; 223. Atomizing nozzle; 23. Booster pump; 3. Flow pipe; 31. Transfer pipe; 32. Condensation fittings; 33. Heating ring; 4. Pretreatment tank; 41. Shell; 42. Metal perforated mesh; 5. First demister; 6. Auxiliary mechanism; 61. Box; 62. Activated carbon filter layer; 63. Second demister. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] This application provides a high-tower slow-release compound fertilizer tail gas treatment device, which can solve the problems of excessive tail gas transportation distance, too many treatment steps, reduced treatment efficiency, large land occupation and high equipment cost in related technologies.

[0030] Please see Figures 1-3 A high-tower slow-release compound fertilizer tail gas treatment device includes: a treatment tower 1, two sets of spray components 2 and a flow pipe 3. The treatment tower 1 has an acid washing chamber 1a and an alkaline washing chamber 1b for tail gas treatment. The two sets of spray components 2 are respectively arranged inside the acid washing chamber 1a and the alkaline washing chamber 1b.

[0031] The spray assembly 2 includes a guide pipe 21, a spray pipe fitting 22, and a booster pump 23. The guide pipe 21 is located inside the treatment tower 1, the spray pipe fitting 22 is inserted into the guide pipe 21, and the booster pump 23 is located on the treatment tower 1, with the outlet pipe of the booster pump 23 connected to the spray pipe fitting 22. The flow pipe 3 includes a transfer pipe 31, a condenser fitting 32, and a heating ring 33. The two ends of the transfer pipe 31 are connected to the pickling chamber 1a and the alkaline washing chamber 1b, respectively. The condenser fitting 32 is located inside the transfer pipe 31, and the heating ring 33 is located outside the transfer pipe 31.

[0032] To avoid pollution caused by direct emission of compound fertilizer exhaust gas, during use, the exhaust gas is sent into the acid washing chamber 1a and guided through the guide pipe 21. At the same time, the booster pump 23 and the spray pipe fitting 22 spray and neutralize the exhaust gas to remove the alkaline washing gas. Then the gas enters the transfer pipe 31 and is heated by the heating ring 33. Subsequently, the water vapor mixed in the exhaust gas is condensed through the condenser fitting 32 to remove the spray liquid mixed in the exhaust gas. Then the exhaust gas enters the alkaline washing chamber 1b and is sprayed and neutralized again through the above principle to remove the alkaline gas.

[0033] Specifically, in order to improve the efficiency of exhaust gas treatment, such as Figure 1 and Figure 2As shown, the guide tube 21 in this embodiment includes an umbrella-shaped part 2a and a rod part 2b. The rod part 2b is inserted into the umbrella-shaped part 2a. The rod part 2b is hollow and has open ends. The umbrella-shaped part 2a has several guide holes.

[0034] The diameter of the guide hole is 1-3mm, which is only required to allow the spray liquid accumulated on the umbrella surface 2a to pass through.

[0035] When the exhaust gas enters the rod section 2b through the umbrella section 2a, the exhaust gas inside the rod section 2b is sprayed and neutralized once by the booster pump 23 and the spray pipe fitting 22. After passing through the rod section 2b, the exhaust gas flows to the bottom of the treatment tower 1 through the transmission of the rod section 2b. At the same time, the gas flows upward under the push of the subsequent exhaust gas. In addition, part of the neutralizing liquid sprayed by the booster pump 23 and the spray pipe fitting 22 remains on the umbrella section 2a and then drips down through the guide hole. In this way, the rising exhaust gas is sprayed and neutralized a second time, so that the exhaust gas and the sprayed neutralizing liquid come into more thorough contact, and the exhaust gas treatment effect is better.

[0036] In addition, the umbrella surface 2a can be trapezoidal or umbrella-shaped arc, as long as the neutralizing liquid sprayed onto the top of the umbrella surface 2a can flow and accumulate in all directions.

[0037] Specifically, such as Figure 1 As shown in Figure 3, the spray pipe fitting 22 includes a plurality of atomizing nozzles 223, and a supply pipe 221 and a columnar pipe 222 connected to each other. The top end of the supply pipe 221 is connected to the treatment tower 1, and the bottom end of the columnar pipe 222 is inserted into the rod portion 2b. The plurality of atomizing nozzles 223 are arranged in a ring on the columnar pipe 222.

[0038] In order to ensure that the exhaust gas flowing inside the rod 2b comes into full contact with the neutralizing liquid, densely distributed atomizing nozzles are installed on the columnar pipe 222 to fill the inside of the rod 2b with water mist, so that the exhaust gas can be fully neutralized.

[0039] Furthermore, in order to accumulate sufficient neutralizing liquid for secondary spraying on the umbrella surface 2a, two sets of water outlets are provided on the side of the top of the columnar pipe 222, that is, the part of the columnar pipe 222 located above the umbrella surface 2a. The diameter of the water outlets can be 1-2 cm.

[0040] It should be noted that in this embodiment, the outlet pipe of the booster pump 23 is connected to the supply pipe, and the inlet pipe of the booster pump 23 is connected to the corresponding external spray liquid supply pipe.

[0041] Specifically, the inlet pipe of one booster pump 23 is connected to the sodium hydroxide absorbent supply pipe, and the inlet pipe of the other booster pump 23 is connected to the dilute sulfuric acid absorbent supply pipe.

[0042] Preferred, such as Figure 1 and Figure 4 As shown, the adapter pipe 31 in this embodiment is L-shaped, the heating ring 33 is disposed on the side of the adapter pipe 31 near the pickling chamber 1a, the condenser pipe 32 is disposed on the side of the adapter pipe 31 near the alkaline washing chamber 1b, and the end of the adapter pipe 31 near the alkaline washing chamber 1b is inclined upward.

[0043] Specifically, the end of the transfer pipe 31 near the pickling chamber 1a is vertical, and the end of the transfer pipe 31 near the alkaline washing chamber 1b is horizontal, with one end tilted upwards, so that the liquid condensed by the cooling pipe 32 can easily flow back into the pickling chamber 1a.

[0044] Preferably, in order to further remove water vapor mixed in the exhaust gas inside the transfer pipe 31, a first demister 5 is provided inside the transfer pipe 31 in this embodiment. The first demister 5 is located above the heating ring 33. During use, the water vapor mixed in the exhaust gas is removed by the first demister 5.

[0045] The heating ring 33 in this embodiment includes an annular shell and several annular heating wires, with the several annular heating wires disposed inside the annular shell.

[0046] Furthermore, such as Figure 1 and Figure 4 As shown, the condenser fitting 32 includes a hollow pipe and a support connected to each other. The top of the support is connected to the inside of the adapter pipe 31. Two flow pipes are arranged opposite each other on the hollow pipe.

[0047] One side of the circulation pipe is connected to the external cold water supply pipe, and the other side of the circulation pipe is connected to the external recovery pipe; and several guide rods are installed at the bottom of the hollow pipe.

[0048] The hollow pipe is always filled with cold water through two circulation pipes. The heated exhaust gas is suddenly cooled and condensed, which further removes the water vapor mixed in with the exhaust gas.

[0049] Furthermore, such as Figure 1 and Figure 5 As shown, this embodiment also includes a pretreatment tank 4, which includes a shell 41 and two sets of perforated metal mesh 42. The shell 41 is mounted on the treatment tower 1 and is connected to the pickling chamber 1a. The perforated metal mesh 42 is inserted into the shell 41. The shell 41 is provided with an exhaust gas inlet pipe, which is connected to an external exhaust gas delivery pipeline.

[0050] In order to remove dust and large particulate impurities from the exhaust gas, the exhaust gas is pretreated by passing it through a perforated metal mesh 42 before it is sent into the treatment tower 1 to remove the dust and large particulate impurities inside.

[0051] Furthermore, such as Figure 1 and Figure 4 As shown, this embodiment also includes an auxiliary mechanism 6, which includes a housing 61, two sets of activated carbon filter layers 62, and a second demister 63. The housing 61 is installed on the treatment tower 1 and is connected to the alkaline washing chamber 1b. The activated carbon filter layers 62 are inserted into the housing 61, and the second demister 63 is installed inside the housing 61 and located above the activated carbon filter layers 62.

[0052] After the exhaust gas is filtered, the second demister 63 removes the water vapor trapped in it to avoid wasting the neutralizing liquid. Then, the exhaust gas is filtered through the activated carbon filter layer 62 to achieve the effect of deodorization.

[0053] It should be noted that the first demister 5 and the second demister 63 in this embodiment are mainly composed of corrugated blades, plates, clamping strips and other fixing devices, which are existing technologies and will not be described in detail here.

[0054] It should be noted that the treatment tower 1 is equipped with two neutral liquid recovery pipes, and the two neutral liquid recovery pipes are connected to the acid washing chamber 1a and the alkali washing chamber 1b respectively, and the bottom wall of the treatment tower 1 is recessed towards the connection part of the neutral liquid recovery pipe.

[0055] The working principle of this application is as follows:

[0056] After being filtered through the perforated metal mesh 42 inside the pretreatment tank 4, the exhaust gas is sent into the pickling chamber 1a. The exhaust gas then enters the rod section 2b through the umbrella section 2a. A booster pump 23 delivers external neutralizing liquid into the supply pipe 221 and columnar pipe 222, which is then sprayed out through the atomizing nozzle 223, ensuring full contact between the flowing exhaust gas and the neutralizing liquid. The exhaust gas then flows upwards after passing the bottom of the rod section 2b. The neutralizing liquid remaining on the umbrella section 2a drips through the guide holes, performing a secondary spray neutralization on the exhaust gas and removing its internal alkaline gases. After neutralization, the gas enters the transfer pipe 31 and is heated by the heating ring 33. At the same time, the first demister 5 demistes the exhaust gas, and then the condenser pipe 32 condenses the exhaust gas to remove its internal water vapor. The exhaust gas then enters the alkaline washing chamber 1b, and through the above principle, the exhaust gas is washed again with alkaline to remove its internal acidic gases. Finally, the exhaust gas enters the housing 61, where the second demister 63 removes its internal water vapor, and the activated carbon filter layer 62 performs a deodorization process before being sent to the external pipeline for discharge.

[0057] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0058] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A high-tower slow-release compound fertilizer tail gas treatment device, characterized in that, include: The treatment tower (1) has an acid washing chamber (1a) and an alkaline washing chamber (1b) for tail gas treatment. Two sets of spraying components (2) are respectively installed inside the pickling chamber (1a) and the alkaline washing chamber (1b); The spray assembly (2) includes a guide pipe (21), a spray pipe fitting (22), and a booster pump (23). The guide pipe (21) is installed inside the treatment tower (1), the spray pipe fitting (22) is inserted into the guide pipe (21), and the booster pump (23) is installed on the treatment tower (1). The outlet pipe of the booster pump (23) is connected to the spray pipe fitting (22). The flow pipe (3) includes a transfer pipe (31), a condenser fitting (32) and a heating ring (33). The two ends of the transfer pipe (31) are connected to the pickling chamber (1a) and the alkaline washing chamber (1b) respectively. The condenser fitting (32) is located inside the transfer pipe (31) and the heating ring (33) is located outside the transfer pipe (31). The guide tube (21) includes an umbrella-shaped part (2a) and a rod part (2b). The rod part (2b) is inserted into the umbrella-shaped part (2a). The rod part (2b) is hollow and has open ends. The umbrella-shaped part (2a) has several guide holes. The spray pipe fitting (22) includes a plurality of atomizing nozzles (223), and a supply pipe (221) and a columnar pipe (222) connected to each other. The top end of the supply pipe (221) is connected to the treatment tower (1), and the bottom end of the columnar pipe (222) is inserted into the rod (2b). The plurality of atomizing nozzles (223) are arranged in a ring on the columnar pipe (222).

2. The high-tower slow-release compound fertilizer tail gas treatment device as described in claim 1, characterized in that: The adapter pipe (31) is L-shaped, the heating ring (33) is located on the side of the adapter pipe (31) near the pickling chamber (1a), the condenser fitting (32) is located on the side of the adapter pipe (31) near the alkaline washing chamber (1b), and the end of the adapter pipe (31) near the alkaline washing chamber (1b) is inclined upward.

3. The high-tower slow-release compound fertilizer tail gas treatment device as described in claim 1, characterized in that: The adapter pipe (31) is equipped with a first demister (5), which is located above the heating ring (33).

4. The high-tower slow-release compound fertilizer tail gas treatment device as described in claim 1, characterized in that: The condenser fitting (32) includes a hollow pipe and a support connected to each other. The top of the support is connected to the inside of the adapter pipe (31). Two flow pipes are arranged opposite each other on the hollow pipe.

5. The high-tower slow-release compound fertilizer tail gas treatment device as described in claim 1, characterized in that: It also includes a pretreatment tank (4), which includes a shell (41) and two sets of perforated metal mesh (42). The shell (41) is installed on the treatment tower (1) and is connected to the pickling chamber (1a). The perforated metal mesh (42) is inserted into the shell (41). The housing (41) is provided with an exhaust gas inlet pipe.

6. The high-tower slow-release compound fertilizer tail gas treatment device as described in claim 1, characterized in that: It also includes an auxiliary mechanism (6), which includes a housing (61), two sets of activated carbon filter layers (62), and a second demister (63). The housing (61) is installed on the treatment tower (1) and is connected to the alkaline washing chamber (1b). The activated carbon filter layers (62) are inserted into the housing (61). The second demister (63) is installed inside the housing (61) and is located above the activated carbon filter layers (62).

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