Fluidized bed granulation cooler tail gas treatment device

Abstract

The utility model relates to a tail gas treatment device for a fluidized bed granulation cooler, and aims to solve the problems that all tail gases need to be subjected to deamination treatment, the deamination gas amount is increased, the investment cost is high, the energy consumption is high and the effect is poor because two tail gases are mixed and treated together in the conventional urea tail gas washing system. The device comprises a device body and pass partition plates, wherein the interior of the device body is vertically divided into three layers; each of the upper layer and the middle layer is transversely provided with a washing area and a demisting area, and the lower layer is a liquid storage area; the device further comprises a filler assembly, a circulating liquid washing assembly, a clear liquid washing assembly and a demister element. The tail gas is washed by adopting one-stage washing, absorption and two-stage coalescence demisting, and is finally discharged after reaching the standard, the water consumption is small, the resistance is low, the total weight is effectively reduced, and the investment cost and the occupied area of equipment are reduced.

Description

Technical Field

[0001] The utility model relates to the field of chemical production, in particular to a fluidized bed granulation cooler tail gas treatment device. Background Art

[0002] The tail gas of urea fluidized bed granulation mainly consists of two parts. One part is the tail gas produced during fluidized bed granulation, and the main pollutants are urea dust, ammonia, etc. It is characterized by high temperature, large amount of steam, high humidity, high urea dust and particulate matter, and high ammonia content. The other part is the tail gas produced when urea granules are cooled in the first cooler, and its main component is urea dust, with low temperature, low humidity, low dust content, and no ammonia in the tail gas. When treating the tail gas, most of the existing urea tail gas washing systems mix the two tail gases and treat them together, resulting in all tail gases needing to be deammonified, increasing the amount of deammonified gas, high investment cost, high energy consumption, and unsatisfactory effect. Summary of the invention

[0003] In order to solve the problem that most existing urea tail gas washing systems mix the two tail gases and treat them together, resulting in all tail gases needing to be deammonified, increasing the amount of deammonified gas, high investment cost, high energy consumption, and unsatisfactory effect.

[0004] The utility model discloses a fluidized bed granulation cooler tail gas treatment device, comprising a device body, the device body comprising a wall plate, a top plate, and a bottom plate, forming a square working area, an upper partition plate and a lower partition plate are arranged in the device body, the upper partition plate is connected to the top plate and vertically divides the device body into an upper layer, a middle layer, and a lower layer with the lower partition plate; each layer of the upper layer and the middle layer is horizontally provided with a washing area and a demisting area, and the lower layer is a liquid storage area;

[0005] The washing area comprises a packing assembly, a circulating liquid washing assembly is arranged in front of the packing assembly, a clear liquid washing assembly is arranged behind the packing assembly, and a screen assembly is arranged behind the clear liquid washing assembly;

[0006] The demisting area is provided with a demisting area end plate and a demisting element disc, the demisting area end plate vertically connects the equipment body and the demisting element disc, the demisting element disc, the demisting area end plate and the equipment body form an independent demisting space, and a demisting element is provided above the demisting element disc;

[0007] The washing area is provided with a downcomer connected to the liquid storage area, and the demisting area is provided with a downcomer connected to the liquid storage area;

[0008] The wall plate is connected to the upper liquid collecting area partition end plate, and the upper liquid collecting area partition end plate is connected to the tail gas outlet.

[0009] The tail gas outlet is in a square cone shape.

[0010] The packing assembly includes stainless steel packing and a packing frame.

[0011] The wire mesh component is a loose mesh structure woven from fibers.

[0012] The packing assembly is inclined by about 5 to 10°.

[0013] The circulating liquid washing component and the clear liquid washing component are connected and fixed to the equipment body, the nozzles are arranged at equal distances, and the spray coverage area is required to be ≥150%.

[0014] The equipment body is provided with an inspection port with a sight glass.

[0015] The demister element is cylindrical, with a flange at the inlet end, connected to the demister element faceplate, and the end is sealed, and the medium passes through the cylinder wall from the inside to the outside.

[0016] The advantages of the utility model are:

[0017] The utility model adopts one-stage washing and absorption for tail gas washing, two-stage coalescence and demisting, and finally reaches the standard for discharge, avoids coalescence and the spray liquid at the bottom of the module coalescing into a water curtain, and prevents the damage of the filler and the coalescence membrane block during use to cause tail gas deviation, prevents the generation of secondary mist entrainment, has low water consumption and low resistance, effectively reduces the overall size of the equipment and the overall weight of the equipment, reduces the investment cost and floor space of the equipment, ensures the uniform flow of gas flowing through the coalescence membrane block and the demisting element, and prevents the re-atomization of droplets on the surface of the demisting element. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Explanation of the reference numerals: 1. exhaust gas inlet; 2. circulating liquid washing assembly; 3. clear liquid washing assembly; 4. packing assembly; 5. screen assembly; 6. upper partition plate; 7. defogger element faceplate; 8. defogger zone end plate; 9. equipment body; 10. defogger element; 11. downcomer; 12. exhaust gas outlet; 13. upper liquid collecting zone partition end plate; 14. inspection port with sight glass; 15. lower partition plate. DETAILED DESCRIPTION

[0020] like Figure 1 As shown: the utility model equipment mainly includes: a fluidized bed granulation cooler tail gas treatment device, including an equipment body 9, the equipment body 9 includes a wall plate, a top plate, and a bottom plate, forming a square working area, and an upper partition plate 6 and a lower partition plate 15 are arranged in the equipment body 9, and the upper partition plate 6 is connected to the top plate and vertically divides the equipment body 9 into an upper layer, a middle layer, and a lower layer with the lower partition plate 15; each layer of the upper layer and the middle layer is horizontally provided with a washing area and a demisting area, and the lower layer is a liquid storage area;

[0021] The washing area includes a packing assembly 4, a circulating liquid washing assembly 2 is provided in front of the packing assembly 4, a clear liquid washing assembly 3 is provided behind the packing assembly 4, and a screen assembly 5 is provided behind the clear liquid washing assembly 3;

[0022] The demisting area is provided with a demisting area end plate 8 and a demisting element faceplate 7. The demisting area end plate 8 vertically connects the equipment body 9 and the demisting element faceplate 7. The demisting element faceplate 7, the demisting area end plate 8 and the equipment body 9 form an independent demisting space. The demisting element faceplate 7 is provided with a demisting element 10 rolled into a cylindrical shape by a variety of composite materials, with a flange at the inlet end, connected to the faceplate, and the end is sealed. The medium passes through the cylinder wall from the inside to the outside, and a special material is selected to effectively prevent emulsified water and water droplets from passing through, thereby achieving an effective dehydration effect. The free water continues to aggregate and grow, and falls onto the faceplate 7 through the hydrophobic layer of the outer wall.

[0023] The washing area is provided with a downcomer 11 connected to the liquid storage area, and the demisting area is provided with a downcomer 11 connected to the liquid storage area;

[0024] The wall plate is connected to the upper liquid collecting area partition end plate 13 , and the upper liquid collecting area partition end plate 13 is connected to the tail gas outlet 12 .

[0025] The exhaust gas outlet 12 is in a square cone shape.

[0026] The packing assembly 4 includes a stainless steel packing and a packing frame.

[0027] The mesh assembly 5 is a loose mesh structure woven from extremely fine fibers, with a relatively large surface area. Tiny mist droplets collide on its surface for many times and continuously condense and grow, thereby bringing extremely high separation efficiency and being easy to clean.

[0028] The filler assembly 4 is inclined by about 5 to 10°.

[0029] The circulating liquid washing component 2 and the clear liquid washing component 3 are in the shape of branches, are connected and fixed to the equipment body 1, and the nozzles are arranged at equal distances, and the spray coverage area is required to be ≥150%.

[0030] The equipment body 9 is provided with an inspection port 14 with a viewing mirror.

[0031] The demister element 10 is cylindrical, with a flange at the inlet end, connected to the demister element faceplate 7, and the end is sealed, and the medium passes through the cylinder wall from the inside to the outside.

[0032] When in use: the exhaust gas entering the equipment body 9 from the exhaust gas inlet 1 goes along the upper two-layer channel divided by the partition plate 6 and the lower partition plate 15 welded to the equipment body 1, and is washed by the filler assembly 4 fixed on the equipment body 1, the partition plate 6 and the lower partition plate 15, and agglomerated by the wire mesh assembly 5, and then efficiently defogs through the demister element 10 installed on the demister element faceplate 7, and then flows out through the exhaust gas outlet 12 for discharge.

[0033] The circulating liquid washing component 2 is in the shape of a tree branch, inclined about 5 to 10° with the vertical line of the equipment, installed in front of the packing component 4 in parallel with the packing component 4, connected and fixed to the equipment body, and the nozzles are arranged at equal distances. The spray coverage area is required to be ≥150%.

[0034] The clear liquid washing component 3 is in the shape of a tree branch, vertically installed in front of the screen component 5, connected and fixed to the equipment body, and the nozzles are arranged at equal distances, and the spray coverage area is required to be ≥150%.

[0035] The inspection port 14 with a sight glass is welded to the side plate of the equipment body and is used for observation during normal operation and installation and removal of components such as fillers and screens during shutdown and maintenance.

[0036] The step partition 6 and the lower step partition 15 are welded to the side panels of the equipment body to divide the internal space of the equipment into three layers: upper, middle and lower.

[0037] The demisting element faceplate is welded to the end plate of the demisting area and the side plate and top plate of the equipment, which separates the demisting area into a separate independent space. The gas passes through the demisting element from the inside to the outside, effectively removing impurities in the gas.

[0038] When using:

[0039] After the tail gas entering the equipment body 9 is diverted by the splitter baffle, it is first roughly washed by the filler, then demistered by the mesh component 5 for agglomeration of fine particles, and finally removed by the demister element 10 for removing residual water droplets and fine particles in the tail gas. The design requirements are fully met.

[0040] The effective working area of ​​the equipment is divided into two layers, which reduces the filling height of the packing assembly 4 and the wire mesh assembly 5, avoids the spray liquid at the bottom of the packing assembly 4 and the wire mesh assembly 5 from agglomerating into a water curtain, and prevents the packing assembly 4 and the wire mesh assembly 5 from being damaged during use and causing tail gas deviation.

[0041] The circulating liquid washing component 2 and the clear liquid washing component 3 are installed before the filler component 4 and the wire mesh component 5 to prevent the airflow from generating secondary mist entrainment.

[0042] The filler assembly 4 is tilted at a certain angle, which can ensure that the circulating liquid sprayed from the top of the filler assembly 4 can still be sprayed into the filler under the action of the tail gas, thereby reducing the water consumption of the spraying liquid.

[0043] After the wire mesh assembly 5 is layered, it can prevent the tail gas from deflecting, increase the number of demister elements 10 installed, reduce the gas flow rate entering the demister element 10, ensure the fine mist in the gas is normally condensed, and improve the demister effect of the demister element.

[0044] In order to ensure uniform flow of gas through the wire mesh assembly 5 and the demister element 10 and prevent re-atomization of droplets on the outer surface of the demister element 10, the outlet cross-sectional area of ​​the demister element 10 is as large as possible, and the outlet is designed to be a square cone to avoid sudden changes in shape and cause airflow turbulence.

[0045] During installation: the equipment body 9 is welded by the wall plate, top plate and bottom plate to form a square working area, and the height direction is divided into multiple independent but connected different functional areas by the step partition 6 and the lower step partition 15. The step partition 6 and the lower step partition 15, the upper liquid collection area partition end plate 13 are welded to the wall plate of the equipment body 1. The upper and middle layers are mainly the washing area and the demisting area; the lower layer is the liquid storage area.

[0046] The washing and coalescing areas are divided into two layers, wherein the packing assembly 4 and the screen assembly 5 are respectively fixed to the partition plate 6 of the washing area and the lower partition plate 15 and the top plate and the wall plate of the equipment body. The packing assembly 4 is installed obliquely, and the screen assembly 5 is installed vertically. Spray washing assemblies fixed to the equipment body are respectively installed in front of the packing assembly 4 and the coalescing module assembly. The washing area is connected to the liquid storage area through the downcomer 11.

[0047] The demisting area is divided into two layers, and the demisting element disc 7, the demisting end plate 8 and the top plate and wall plate of the equipment body 9 are divided into mutually independent demisting spaces. The demisting element 10 is installed on the demisting element disc 7. The demisting element disc 7 is welded to the side plate of the equipment body 9 and the demisting end plate 8. The demisting element disc 7 is equipped with a downcomer 11 connected to the liquid storage area.

[0048] Technical features of this utility model:

[0049] 1. The tail gas is washed by one-stage washing and absorption, two-stage coalescence and demisting, and finally reaches the emission standard.

[0050] 2. The washing and absorption sections of the effective working area of ​​the equipment body 1 are separated into two layers, which reduces the filling height of the filler assembly 4 and the wire mesh assembly 5, avoids the spray liquid at the bottom of the filler assembly 4 and the wire mesh assembly 5 from agglomerating into a water curtain, and prevents the filler assembly 4 and the wire mesh assembly 5 from being damaged during use, causing tail gas deviation.

[0051] 3. The washing area is located before the packing assembly 4 and the screen assembly 5 to prevent secondary mist entrainment.

[0052] 4. When the packing assembly 4 is tilted at a certain angle, it can ensure that the wetting liquid sprayed on the top of the packing can still play a wetting role under the action of the exhaust gas to form a liquid film, with low water consumption and low resistance.

[0053] 5. The packing assembly 4 and the wire mesh assembly 5 are arranged in layers, which effectively reduces the overall size and weight of the equipment, and reduces the investment cost and floor space of the equipment.

[0054] 6. The cross-sectional area of ​​the exhaust gas outlet 12 is as large as possible, and the outlet is designed to be square cone to avoid shape

[0055] The sudden change causes the air flow to be turbulent, while ensuring the uniform flow of the gas flowing through the wire mesh assembly 5 and the demister element 10 and preventing the re-atomization of the droplets on the surface of the demister element 10.

Claims

1. A fluidized bed granulation cooler tail gas treatment device, comprising a device body (9), wherein the device body (9) comprises a wall plate, a top plate, and a bottom plate, forming a square working area, characterized in that: An upper dividing partition (6) and a lower dividing partition (15) are provided in the equipment body (9); the upper dividing partition (6) is connected to the top plate and vertically divides the equipment body (9) into an upper layer, a middle layer and a lower layer together with the lower dividing partition (15); each of the upper layer and the middle layer is laterally provided with a washing area and a demisting area, respectively, and the lower layer is a liquid storage area; The washing area comprises a packing assembly (4), a circulating liquid washing assembly (2) is arranged in front of the packing assembly (4), a clear liquid washing assembly (3) is arranged behind the packing assembly (4), and a screen assembly (5) is arranged behind the clear liquid washing assembly (3); The demisting area is provided with a demisting area end plate (8) and a demisting element disc (7); the demisting area end plate (8) vertically connects the equipment body (9) and the demisting element disc (7); the demisting element disc (7), the demisting area end plate (8) and the equipment body (9) form an independent demisting space; a demisting element (10) is provided above the demisting element disc (7); The washing area is provided with a downcomer (11) connected to the liquid storage area, and the demisting area is provided with a downcomer (11) connected to the liquid storage area; The wall plate is connected to the upper liquid collecting area partition end plate (13), and the upper liquid collecting area partition end plate (13) is connected to the tail gas outlet (12).

2. The tail gas treatment device of a fluidized bed granulation cooler according to claim 1, characterized in that: The exhaust gas outlet (12) is in the shape of a square cone.

3. The tail gas treatment device of a fluidized bed granulation cooler according to claim 1, characterized in that: The packing assembly (4) comprises a stainless steel packing and a packing frame.

4. The tail gas treatment device of a fluidized bed granulation cooler according to claim 1, characterized in that: The wire mesh component (5) is a loose mesh structure woven from fibers.

5. The tail gas treatment device of a fluidized bed granulation cooler according to claim 1, characterized in that: The filler assembly 4 is inclined by about 5 to 10°.

6. The tail gas treatment device of a fluidized bed granulation cooler according to claim 1, characterized in that: The circulating liquid washing component (2) and the clear liquid washing component (3) are connected and fixed to the equipment body (9), the spray heads are arranged at equal distances, and the spray coverage area is required to be ≥150%.

7. The tail gas treatment device of a fluidized bed granulation cooler according to claim 1, characterized in that: The equipment body (9) is provided with an inspection port (14) with a sight glass.

8. The tail gas treatment device of a fluidized bed granulation cooler according to claim 1, characterized in that: The demister element (10) is cylindrical, with a flange at the inlet end, connected to the demister element faceplate (7), and the end is sealed, so that the medium passes through the cylinder wall from the inside to the outside.

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