Tail gas treatment device for drum compound fertilizer device

Abstract

The utility model relates to the field of agricultural compound fertilizer production, in particular to a tail gas treatment device of a drum compound fertilizer device, which comprises a cyclone separator, a gas outlet of the cyclone separator is connected with a dust chamber, the dust chamber is connected with a venturi scrubber, and an outlet of the venturi scrubber is connected with an inlet of a water scrubber. A second liquid outlet at the bottom of the water scrubber is connected with a feed port of a mixing tank, the mixing tank is sequentially connected with a first-effect heater, a second-effect heater and a third-effect heater through a first transfer pump, the third-effect heater is connected with a liquid inlet of a filter press, and a solid outlet of the filter press is connected with a fluidized bed. The device has the beneficial effects that the continuous process reaction device and the filtering device are adopted, the standard treatment of tail gas is realized, and the obtained by-products ammonium phosphate and compound fertilizer filtrate can be circularly concentrated and then used for producing compound fertilizer products, so that the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the field of agricultural compound fertilizer production, in particular to an exhaust gas treatment device for a rotary drum compound fertilizer device. Background Art

[0002] At present, the exhaust gas problem is particularly important in the production line of compound fertilizer. The particulate matter and ammonia contained in the exhaust gas are very unfriendly to the environment and are also a waste of resources. Therefore, there is an urgent need to deal with the exhaust gas containing particulate matter and ammonia generated by the compound fertilizer production line.

[0003] The utility model patent can reduce the content of exhaust particulate matter within the standard range through exhaust gas treatment, and solves the problem of serious bag sticking in the production of high-nitrogen formula. The dry smoke is subjected to cyclone and bag dust removal, and then washed to reduce the particulate matter content. At the same time, the particulate matter and ammonia in the exhaust gas are recycled to prepare a compound fertilizer. Summary of the invention

[0004] In view of the fact that the tail gas generated by the above-mentioned compound fertilizer production line contains a large amount of particulate matter and ammonia cannot be recovered, the utility model provides a tail gas treatment device for a rotary drum compound fertilizer device, and its technical scheme is: the dust gas containing ammonia enters the cyclone separator from the gas inlet, the gas outlet of the cyclone separator is connected to the dust removal chamber, the dust collector is connected to the venturi scrubber, the outlet of the venturi scrubber is connected to the inlet of the water washing tower, the second liquid outlet at the bottom of the water washing tower is connected to the feed port of the mixing tank, the mixing tank is connected to the first-effect heater, the second-effect heater and the third-effect heater in sequence through the first transfer pump, the third-effect heater is connected to the liquid inlet of the filter press, and the solid outlet of the filter press is connected to the fluidized bed.

[0005] The neck of the venturi scrubber is connected to an external water inlet pipe, and the first liquid outlet at the lower part of the water washing tower is connected in parallel with the external water inlet pipe through a second transfer pump.

[0006] The top gas outlet of the water scrubber is connected to the chimney to process the exhaust gas to meet the emission standards.

[0007] The solid outlet of the cyclone separator is connected in parallel with the solid outlet of the dust removal chamber to the remaining processes.

[0008] As a preferred solution, the filter cloth of the filter press is PP3927 large chemical fiber cloth with a filtration accuracy of 0.5 μm.

[0009] As a preferred solution, the cyclone separator, dust removal chamber, water washing tower and mixing tank are all controlled by a DCS control system.

[0010] As a preferred solution, the cyclone separator is equipped with an online air volume detector, and the packed tower and the mixing tank are equipped with a pH detector.

[0011] Beneficial effects of the utility model:

[0012] By adopting a continuous process reaction device and a filtering device, the tail gas is treated to meet the standards, and the by-product ammonium phosphate and compound fertilizer filtrate obtained can be recycled and concentrated for the production of compound fertilizer products, thereby improving the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] In the figure: 1. Cyclone separator; 2. Dust removal chamber; 3. Venturi scrubber; 4. Water washing tower; 5. Chimney; 6. Mixing tank; 7. First transfer pump; 8. First effect heater; 9. Second effect heater; 10. Third effect heater; 11. Filter press; 12. Fluidized bed; 13. Second transfer pump. DETAILED DESCRIPTION

[0015] The utility model is further described in detail below based on the accompanying drawings and specific embodiments.

[0016] Example 1

[0017] A tail gas treatment device for a rotary drum compound fertilizer device comprises a cyclone separator 1, a gas outlet of the cyclone separator 1 is connected to a dust removal chamber 2, the dust removal chamber 2 is connected to a venturi scrubber 3, the outlet of the venturi scrubber 3 is connected to an inlet of a water washing tower 4, a second liquid outlet at the bottom of the water washing tower 4 is connected to a feed port of a mixing tank 6, the mixing tank 6 is connected to a first effect heater 8, a second effect heater 9 and a triple effect heater 10 in sequence through a first transfer pump 7, the triple effect heater 10 is connected to a liquid inlet of a filter press 11, and the solid outlet of the filter press 11 is connected to a fluidized bed 12.

[0018] The neck of the venturi scrubber 3 is connected to an external water inlet pipe, and the first liquid outlet at the lower part of the water washing tower 4 is connected in parallel with the external water inlet pipe through the second transfer pump 13.

[0019] The top gas outlet of the water scrubber 4 is connected to the chimney 5 .

[0020] The solid outlet of the cyclone separator 1 and the solid outlet of the dust removal chamber 2 are connected in parallel to the remaining processes.

[0021] Furthermore, the filter cloth of the filter press 11 is PP3927 large chemical fiber cloth, and the filtering accuracy is 0.5 μm.

[0022] Furthermore, the cyclone separator 1, the dust removal chamber 2, the water washing tower 4 and the mixing tank 6 are all controlled by a DCS control system.

[0023] Furthermore, the cyclone separator 1 is equipped with an online air volume detector, and the water washing tower 4 and the mixing tank 6 are equipped with a pH detector.

[0024] Example 2

[0025] The device described in Example 1 is used, and its operation process is as follows: the dust gas containing ammonia enters the cyclone separator 1, undergoes gas-solid separation, wherein the dust is collected and recovered, the ammonia gas enters the dust removal chamber 2, further gas-solid separation, and finally passes through the Venturi scrubber 3 through the airflow to form turbulence and collide and rub against each other, so that the ammonia gas dissolves into ammonia water, and the ammonia water mixed with the remaining dust enters the water washing tower 4, and then after precipitation, the ammonia water mixed with the dust enters the mixing tank 6, and the remaining qualified tail gas is discharged through the chimney 5, and the dust-free ammonia water is circulated to the Venturi scrubber 3 through the second transfer pump 13, phosphoric acid is added to the mixing tank 6 and stirred to react with the slurry, and then the first transfer pump 7 passes through the first effect heater 8, the second effect heater 9 and the third effect heater 10 in sequence, and after concentration, phosphoric acid slurry with a solid content of about 40% is obtained, and the slurry enters the filter press 11 for solid-liquid separation to obtain ammonium phosphate solid with a water content of about 20%, and the ammonium phosphate finally enters the fluidized bed 12 for drying to obtain an ammonium phosphate compound fertilizer product with a water content of about 0.5%.

[0026] The core of the whole device is to accurately control the pH of the reaction. The water washing tower 4 and the mixing tank 6 are equipped with online pH detectors, which can accurately display the pH to achieve the purpose of precise control, and the device can operate stably for a long period of time.

Claims

1. A tail gas treatment device for a rotary drum compound fertilizer device, It is characterized in that The invention comprises a cyclone separator (1), wherein the gas outlet of the cyclone separator (1) is connected to a dust removal chamber (2), the dust removal chamber (2) is connected to a venturi scrubber (3), the outlet of the venturi scrubber (3) is connected to the inlet of a water washing tower (4), the second liquid outlet at the bottom of the water washing tower (4) is connected to the feed inlet of a mixing tank (6), the mixing tank (6) is connected to a first effect heater (8), a second effect heater (9) and a third effect heater (10) in sequence through a first transfer pump (7), the third effect heater (10) is connected to the liquid inlet of a filter press (11), and the solid outlet of the filter press (11) is connected to a fluidized bed (12).

2. The tail gas treatment device of a rotary drum compound fertilizer device according to claim 1, It is characterized in that The neck of the venturi scrubber (3) is connected to an external water inlet pipe, and the first liquid outlet at the lower middle portion of the water scrubber (4) is connected in parallel with the external water inlet pipe via a second transfer pump (13).

3. The tail gas treatment device of a rotary drum compound fertilizer device according to claim 1, It is characterized in that The top gas outlet of the water washing tower (4) is connected to the chimney (5).

4. The tail gas treatment device of a rotary drum compound fertilizer device according to claim 1, It is characterized in that The solid outlet of the cyclone separator (1) and the solid outlet of the dust removal chamber (2) are connected in parallel to the remaining processes.

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