Molecular sieve tail gas treatment and fine powder turbid liquid recycling device

Abstract

The utility model relates to a molecular sieve tail gas treatment and fine powder turbid liquid recycling device, and belongs to the field of molecular sieve preparation. Comprising a quench tower, an absorption tower and a settling tank, a clean water sprayer and a turbid liquid sprayer are arranged in the quench tower, a tail gas inlet is formed in the top of the quench tower, the clean water sprayer is arranged below the tail gas inlet, the turbid liquid sprayer is arranged below the clean water sprayer, the clean water sprayer sprays downwards, and the turbid liquid sprayer sprays upwards; the tail gas outlet is arranged below the turbid liquid sprayer and is connected with an absorption tower inlet positioned at the middle lower part of the absorption tower through a pipeline, an absorption liquid sprayer and a filler layer are arranged in the absorption tower, the filler layer is arranged above the absorption tower inlet, the absorption liquid sprayer is arranged above the filler layer, and the absorption tower outlet is arranged at the top of the absorption tower. According to the molecular sieve tail gas recycling device, pollutant reduction emission is achieved, molecular sieve turbid liquid in tail gas is recycled, the product yield is improved, and excellent economic and environment-friendly benefits are achieved.

Description

Technical Field

[0001] The utility model relates to a molecular sieve tail gas treatment and fine powder turbid liquid recycling device, belonging to the field of molecular sieve preparation. Background Technique

[0002] The shape-selective molecular sieve product is a white solid powdery material, with the maximum particle diameter of 60 μm, the minimum particle diameter of 2 μm, and the average particle diameter of 5-8 μm. It can improve the selectivity of the catalyst product and the catalytic activity of different molecules, and plays a very important role in the deep processing of heavy fractions of crude oil. During the production process of the shape-selective molecular sieve product, there are certain molecular sieve fine powders in the flash roasting tail gas and the cooling and packaging tail gas. With the increasing supervision intensity of environmental protection supervision departments at all levels of the government, the requirements for tail gas emissions are getting higher and higher. Even the comprehensive emission standards of fixed-source atmospheric particulate matter in some local governments are much higher than the national emission standards. Meeting the standards for the treatment of the three wastes is the prerequisite for the device to start up, and it also affects the product yield and the operating environment. The existing tail gas treatment equipment is difficult to cope with the more stringent emission standards, and more absorption towers need to be added to achieve the effect, greatly increasing the treatment cost. The recycling of the molecular sieve turbid liquid is also not ideal, resulting in a large amount of waste and the burden of waste treatment. Content of the Utility Model

[0003] According to the problems described in the background, the problems to be solved by the utility model are as follows:

[0004] The existing tail gas treatment has poor absorption effect and high tail gas treatment cost; the recycling effect of a single material is poor, resulting in waste.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A molecular sieve tail gas treatment and fine powder turbid liquid recycling device includes a quench tower, an absorption tower and a sedimentation tank. The quench tower is provided with a fresh water spray and a turbid liquid spray. The tail gas inlet is arranged at the top of the quench tower. The fresh water spray is arranged below the tail gas inlet. The turbid liquid spray is arranged below the fresh water spray. The fresh water spray sprays downward, and the turbid liquid spray sprays upward. The tail gas outlet is arranged below the turbid liquid spray and is connected to the absorption tower inlet in the middle and lower part of the absorption tower through a pipeline. The absorption tower is provided with an absorption liquid spray and a packing layer inside. The packing layer is arranged above the absorption tower inlet. The absorption liquid spray is arranged above the packing layer. The absorption tower outlet is arranged at the top of the absorption tower;

[0007] The turbid liquid collected at the bottom of the quench tower is transported to the sedimentation tank through an external pipeline. One end of the external pipeline is connected to the bottom of the quench tower, and the other end is connected to the middle part of the sedimentation tank;

[0008] The turbid liquid collected at the bottom of the absorption tower is connected to the turbid liquid spray through a circulation pump;

[0009] A turbid liquid external delivery pump is connected to the bottom of the settling tank, a clean water pump is connected to the upper part of the settling tank, and the clean water pump is connected to a clean water spray.

[0010] Preferably, the clean water pump is also connected to an absorbent spray.

[0011] Preferably, the settling tank is provided with a glass window.

[0012] Preferably, the turbid liquid external delivery pump is a plunger pump.

[0013] Preferably, the absorbent used in the absorbent spray is industrial water, the absorbent spray is connected to an industrial water line; the clean water spray is also connected to the industrial water line.

[0014] The utility model adopts comprehensive technologies of sedimentation, separation, clear liquid circulation, and turbid liquid recycling. The quench tower adopts a structure of a quench and a primary absorption composite tower. In the quench tower, a turbulent flow washing process is adopted, and its principle is the impact theory. The gas-liquid two-phase flows in opposite directions along the same axis and collide. Due to inertia, the particles pass through the impact surface and seep into the reverse flow, and make a damped oscillation motion back and forth, extending the residence time and strengthening the heat and mass transfer process. In the quench tower, a dynamic equilibrium foam zone is formed between the gas and the liquid, and the gas is saturated with the washing water. Since the gas quickly turbulently contacts the updated liquid surface, most of the particles are trapped and enter the bottom of the primary absorption tower, and the gas is further cooled to achieve primary purification of the tail gas; at the same time, some submicron particles are carried by the gas to the secondary absorption tower. The secondary absorption adopts a packing dust removal process technology. The primary purified tail gas and the spray water in the absorption tower contact reversely and at high speed in the packing layer. The dust particles collide violently with the droplets and between the dust particles and coagulate. The gas flow velocity becomes smaller and the pressure rises, and the coagulation with the dust particles as the coagulation nuclei becomes faster, and the coagulated dust-containing liquid droplets with larger particle sizes are trapped, further purifying the dust in the tail gas to meet the standards. The turbid liquid in the secondary absorption tower is used as the absorbent in the primary absorption tower, flows into the settling tank from the bottom of the primary absorption tower, and after vertical sedimentation, the clear liquid is recycled, and the turbid liquid is recovered to the previous process for recycling.

[0015] The beneficial effects of the utility model are:

[0016] The utility model adopts a turbulent flow washing process and a turbid liquid circulation system, improves the absorption effect, reduces the water consumption, not only realizes the reduction of pollutant emissions, but also recovers the molecular sieve turbid liquid in the tail gas, improves the product yield, and has excellent economic and environmental benefits. Description of the Drawings

[0017] Figure 1 Schematic diagram of the utility model

[0018] In the figure: 1 is a quench tower; 11 is a tail gas inlet; 12 is a fresh water spray; 13 is a turbid liquid spray; 14 is an external delivery pipeline; 2 is an absorption tower; 21 is an absorption tower inlet; 22 is a packing layer; 23 is an absorption liquid spray; 24 is an absorption tower outlet; 3 is a settling tank; 4 is a circulation pump; 5 is a fresh water pump; 6 is a turbid liquid external delivery pump; 7 is an industrial water pipeline. Detailed implementation mode

[0019] Example 1

[0020] A molecular sieve tail gas treatment and fine powder turbid liquid recycling device includes a quench tower 1, an absorption tower 2 and a settling tank 3. The quench tower is provided with a fresh water spray 12 and a turbid liquid spray 13 inside. The tail gas inlet 11 is arranged at the top of the quench tower 1. The fresh water spray 12 is arranged below the tail gas inlet 11. The turbid liquid spray 13 is arranged below the fresh water spray 12. The fresh water spray 12 sprays downward, and the turbid liquid spray 13 sprays upward. The tail gas outlet is arranged below the turbid liquid spray 13 and is connected to the absorption tower inlet 21 located in the middle and lower part of the absorption tower 2 through a pipeline. Inside the absorption tower 2, there is an absorption liquid spray 23 and a packing layer 22. The packing layer 22 is arranged above the absorption tower inlet 21. The absorption liquid spray 23 is arranged above the packing layer 22. The absorption tower outlet 24 is arranged at the top of the absorption tower 2;

[0021] The turbid liquid collected at the bottom of the quench tower 1 is transported to the settling tank 3 through the external delivery pipeline 14. One end of the external delivery pipeline 14 is connected to the bottom of the quench tower 1, and the other end is connected to the middle part of the settling tank 3;

[0022] The turbid liquid collected at the bottom of the absorption tower 2 is connected to the turbid liquid spray 13 through the circulation pump 4;

[0023] The bottom of the settling tank 3 is connected with a turbid liquid external delivery pump 6. The upper part of the settling tank 3 is connected with a fresh water pump 5, and the fresh water pump 5 is connected to the fresh water spray 12.

[0024] The fresh water pump 5 is also connected to the absorption liquid spray 23.

[0025] The settling tank 3 is provided with a glass window.

[0026] The turbid liquid external delivery pump 6 adopts a plunger pump.

[0027] The absorption liquid used in the absorption liquid spray 23 is industrial water. The absorption liquid spray 23 is connected to the industrial water pipeline 7; the fresh water spray 12 is also connected to the industrial water pipeline 7. It can prevent water replenishment when the fresh water pump 5 fails, and can effectively prevent the device from stopping circulation due to lack of spray water and causing safety accidents.

[0028] The utility model not only realizes the reduction of pollutant emissions, but also recovers the molecular sieve turbid liquid in the tail gas, improves the product yield, and has excellent economic and environmental benefits.

Claims

1. A molecular sieve tail gas treatment and fine powder turbid liquid recycling device, characterized in that It includes a quench tower (1), an absorption tower (2) and a settling tank (3). A fresh water spray (12) and a turbid liquid spray (13) are provided in the quench tower. A tail gas inlet (11) is provided at the top of the quench tower (1). The fresh water spray (12) is provided below the tail gas inlet (11). The turbid liquid spray (13) is provided below the fresh water spray (12). The fresh water spray (12) sprays downward, and the turbid liquid spray (13) sprays upward. The tail gas outlet is provided below the turbid liquid spray (13) and is connected through a pipeline to an absorption tower inlet (21) in the middle and lower part of the absorption tower (2). An absorption liquid spray (23) and a packing layer (22) are provided in the absorption tower (2). The packing layer (22) is provided above the absorption tower inlet (21). The absorption liquid spray (23) is provided above the packing layer (22). An absorption tower outlet (24) is provided at the top of the absorption tower (2). The turbid liquid collected at the bottom of the quench tower (1) is transported to the settling tank (3) through an external delivery pipeline (14). One end of the external delivery pipeline (14) is connected to the bottom of the quench tower (1), and the other end is connected to the middle of the settling tank (3). The turbid liquid collected at the bottom of the absorption tower (2) is connected to the turbid liquid spray (13) through a circulation pump (4). A turbid liquid external delivery pump (6) is connected to the bottom of the settling tank (3). A fresh water pump (5) is connected to the upper part of the settling tank (3). The fresh water pump (5) is connected to the fresh water spray (12).

2. The molecular sieve tail gas treatment and fine powder turbid liquid recycling device according to claim 1, characterized in that, The fresh water pump (5) is also connected to the absorption liquid spray (23).

3. The molecular sieve tail gas treatment and fine powder turbid liquid recycling device according to claim 1, characterized in that, The settling tank (3) is provided with a glass window.

4. The molecular sieve tail gas treatment and fine powder turbid liquid recycling device according to claim 1, characterized in that The turbid liquid external delivery pump (6) uses a plunger pump.

5. The molecular sieve tail gas treatment and fine powder turbid liquid recycling device according to claim 1, wherein The absorption liquid used in the absorption liquid spray (23) is industrial water. The absorption liquid spray (23) is connected to an industrial water line (7). The fresh water spray (12) is also connected to the industrial water line (7).

Images