CN214972882U

CN214972882U - Fluidized bed tail gas enhanced cooling system

Info

Publication number: CN214972882U
Application number: CN202121257133.9U
Authority: CN
Inventors: 苏新平; 李彩妍; 裴耀祖
Original assignee: Ningxia Yingfu Jinhe Technology Co ltd
Current assignee: Ningxia Yingfu Jinhe Technology Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2021-12-03
Anticipated expiration: 2031-06-07

Abstract

A fluidized bed tail gas enhanced cooling system comprises a washing unit, the washing unit comprises a condenser, the condenser comprises a first inner cylinder, a first jacket and a spray pipe, the lower end of the first inner cylinder is used for introducing hydrogen fluoride tail gas, the upper end of the first inner cylinder is used for discharging hydrogen fluoride tail gas, the outer wall of the first inner cylinder is provided with the first jacket so as to form a first cooling cavity between the first inner cylinder and the first jacket, a cooling medium circulates in the first cooling cavity, the spray pipe is fixedly arranged in the first inner cylinder close to the upper end so as to spray water into the first inner cylinder from the upper end of the first inner cylinder, high-temperature hydrogen fluoride tail gas is preliminarily cooled by a heat exchanger, harmful hydrogen fluoride is removed by a three-stage washing tank and is cooled simultaneously and finally enters the condenser, as the spray pipe is arranged in the condenser, the cooling of the jacket and the spray water are carried out synchronously, the temperature of the hydrogen fluoride tail gas can be effectively reduced to below 30 ℃, even can be reduced to below 25 ℃ in winter, and meets the national emission standard.

Description

Fluidized bed tail gas enhanced cooling system

Technical Field

The utility model relates to an anhydrous aluminium fluoride production technical field, in particular to fluidized bed tail gas intensification cooling system.

Background

The anhydrous aluminum fluoride produced by the reaction of aluminum hydroxide and hydrogen fluoride belongs to exothermic reaction, the temperature of the produced hydrogen fluoride tail gas is about 380 ℃, and the high-temperature hydrogen fluoride tail gas is evacuated after multiple heat exchange and washing.

However, in the prior art, the temperature of the cooled hydrogen fluoride tail gas is always higher than 50 ℃ and even up to 90 ℃, and the hydrogen fluoride tail gas does not meet the national emission standard.

Disclosure of Invention

In view of the above, it is necessary to provide a fluidized bed tail gas enhanced cooling system capable of meeting the emission requirement of hydrogen fluoride tail gas.

The utility model provides a fluidized bed tail gas intensive cooling system, includes the washing unit, the washing unit includes the condenser, the condenser includes first inner tube, first cover, shower, the lower extreme of first inner tube is used for letting in hydrogen fluoride tail gas, the upper end of first inner tube be used for discharging hydrogen fluoride tail gas, the outer wall of first inner tube is equipped with first cover to make and form first cooling chamber between first inner tube and the first cover, first cooling chamber circulation has cooling medium, and the position that is close to the upper end in first inner tube has set firmly the shower, so that the upper end shower of first inner tube is followed to spray into in the first inner tube to the shower.

Preferably, the washing unit further comprises a first washing tank, a second washing tank and a third washing tank, wherein an outlet of the first washing tank is connected with an inlet of the second washing tank, an outlet of the second washing tank is connected with an inlet of the third washing tank, and an outlet of the third washing tank is connected with the lower end of the first inner cylinder.

Preferably, the washing unit further comprises an electric precipitator, and the upper end of the first inner cylinder is connected with an inlet of the electric precipitator.

Preferably, the fluidized bed tail gas enhanced cooling system further comprises a heat exchanger, the heat exchanger comprises a second inner cylinder and a second jacket, the outer wall of the second inner cylinder is provided with the second jacket, so that a second cooling cavity is formed between the second inner cylinder and the second jacket, and the upper end of the second inner cylinder is connected with the inlet of the first washing tank.

Preferably, the heat exchanger further comprises a spiral partition plate, and the spiral partition plate is a spiral plate formed between the outer wall of the second inner cylinder and the inner wall of the second jacket along the axial direction of the second inner cylinder.

Preferably, the fluidized bed tail gas enhanced cooling system further comprises a fluidized bed, and a gas phase outlet of the fluidized bed is connected with the lower end of the second inner cylinder.

Preferably, the fluidized bed tail gas enhanced cooling system further comprises a gas preheating unit, the gas preheating unit comprises a mixing pipe, one end of the mixing pipe is used for blowing air, and the other end of the mixing pipe is connected with a gas phase inlet of the fluidized bed.

Preferably, the gas preheating unit further comprises a hydrogen fluoride gas pipe, one end of the hydrogen fluoride gas pipe is used for blowing hydrogen fluoride gas, and the other end of the hydrogen fluoride gas pipe is communicated with the inner cavity of the mixing pipe.

Preferably, the first inner cylinder is a graphite tube.

Preferably, the fluidized bed tail gas enhanced cooling system further comprises an aluminum hydroxide bin, and an outlet of the aluminum hydroxide bin is connected with a solid phase inlet of the fluidized bed.

Compared with the prior art, the beneficial effects of the utility model reside in that:

high temperature hydrogen fluoride tail gas is through heat exchanger primary cooling, gets rid of harmful hydrogen fluoride through tertiary washing tank again to simultaneously the cooling, gets into the condenser at last, because be equipped with the shower in the condenser, press from both sides the cover cooling and go on in step with the shower water, can effectually fall hydrogen fluoride tail gas temperature to below 30 ℃, can fall to below 25 ℃ even winter, has satisfied national emission standard.

Drawings

Fig. 1 is a schematic structural view of the condenser.

FIG. 2 is a schematic structural diagram of the fluidized bed tail gas enhanced cooling system.

In the figure: a washing unit 10, a condenser 11, a first inner cylinder 111, a first jacket 112, a shower pipe 113, a first washing tank 12, a second washing tank 13, a third washing tank 14, a heat exchanger 20, a second inner cylinder 21, a second jacket 22, a fluidized bed 30, a gas preheating unit 40, a mixing pipe 41, and a hydrogen fluoride gas pipe 42.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Referring to fig. 1 and 2, the embodiment of the present invention provides a fluidized bed 30 tail gas cooling system, including washing unit 10, washing unit 10 includes condenser 11, condenser 11 includes first inner tube 111, first clamp cover 112, shower pipe 113, the lower extreme of first inner tube 111 is used for letting in hydrogen fluoride tail gas, the upper end of first inner tube 111 be used for discharging hydrogen fluoride tail gas, the outer wall of first inner tube 111 is equipped with first clamp cover 112, so that form first cooling chamber between first inner tube 111 and the first clamp cover 112, first cooling chamber circulation has cooling medium, position near the upper end has set firmly shower pipe 113 in first inner tube 111, so that shower water sprays into first inner tube 111 from the upper end of first inner tube 111.

high temperature hydrogen fluoride tail gas is through heat exchanger 20 primary cooling, gets rid of harmful hydrogen fluoride through tertiary washing tank again to simultaneously the cooling, gets into condenser 11 at last, because be equipped with shower 113 in the condenser 11, press from both sides the cover cooling and go on in step with the shower water, can effectually fall hydrogen fluoride tail gas temperature to below 30 ℃, can even fall to below 25 ℃ winter, has satisfied national emission standard.

Referring to fig. 1 and 2, further, the washing unit 10 further includes a first washing tank 12, a second washing tank 13, and a third washing tank 14, an outlet of the first washing tank 12 is connected to an inlet of the second washing tank 13, an outlet of the second washing tank 13 is connected to an inlet of the third washing tank 14, and an outlet of the third washing tank 14 is connected to a lower end of the first inner tub 111.

Referring to fig. 1 and 2, further, the washing unit 10 further includes an electric precipitator, and the upper end of the first inner cylinder 111 is connected to an inlet of the electric precipitator.

Referring to fig. 1 and 2, further, the fluidized bed 30 tail gas intensive cooling system further includes a heat exchanger 20, the heat exchanger 20 includes a second inner cylinder 21 and a second jacket 22, the outer wall of the second inner cylinder 21 is provided with the second jacket 22, so that a second cooling cavity is formed between the second inner cylinder 21 and the second jacket 22, and the upper end of the second inner cylinder 21 is connected to the inlet of the first washing tank 12.

Referring to fig. 1 and 2, further, the heat exchanger 20 further includes a spiral partition plate, which is a spiral plate formed between an outer wall of the second inner cylinder 21 and an inner wall of the second jacket 22 along an axial direction of the second inner cylinder 21.

Referring to fig. 1 and 2, further, the fluidized bed 30 tail gas intensive cooling system further includes a fluidized bed 30, and a gas phase outlet of the fluidized bed 30 is connected with the lower end of the second inner cylinder 21.

Referring to fig. 1 and 2, further, the fluidized bed 30 tail gas intensive cooling system further includes a gas preheating unit 40, the gas preheating unit 40 includes a mixing pipe 41, one end of the mixing pipe 41 is used for blowing air, and the other end of the mixing pipe 41 is connected to the gas phase inlet of the fluidized bed 30.

Referring to fig. 1 and 2, further, the gas preheating unit 40 further includes a hydrogen fluoride gas pipe 42, one end of the hydrogen fluoride gas pipe 42 is used for blowing hydrogen fluoride gas, and the other end of the hydrogen fluoride gas pipe 42 is communicated with the inner cavity of the mixing pipe 41.

Referring to fig. 1 and 2, further, the first inner cylinder 111 is a graphite tube.

Referring to fig. 1 and 2, further, the fluidized bed tail gas intensive cooling system further includes an alumina hydrate bin, and an outlet of the alumina hydrate bin is connected to a solid phase inlet of the fluidized bed 30.

Referring to fig. 1 and 2, in a specific embodiment, the upper end of the shower pipe 113 is used for introducing shower water, the lower end of the shower pipe 113 is closed, a shower gap is arranged on the outer wall of the shower pipe 113 close to the closed end, the shower gap penetrates through the annular wall of the shower pipe 113, the shower gap is a spiral through gap formed on the annular wall of the shower pipe 113 along the axial direction of the shower pipe 113, the lower end of the shower pipe 113 extends into the first inner cylinder 111, and the shower pipe 113 and the first inner cylinder 111 are coaxially arranged.

Spray water in the shower 113 is from spraying the gap blowout to first inner tube 111 in, and the spun spray water forms spiral spray water film between the inner wall of first inner tube 111 and shower 113, and hydrogen fluoride tail gas need pass the spray water film of one deck, shows the improvement to hydrogen fluoride's absorption effect, and hydrogen fluoride tail gas's cooling effect is showing and is improving.

The embodiment of the utility model provides a module or unit in the device can merge, divide and delete according to actual need.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The fluidized bed tail gas enhanced cooling system is characterized in that: the device comprises a washing unit, wherein the washing unit comprises a condenser, the condenser comprises a first inner cylinder, a first jacket and a spray pipe, the lower end of the first inner cylinder is used for introducing hydrogen fluoride tail gas, the upper end of the first inner cylinder is used for discharging the hydrogen fluoride tail gas, the outer wall of the first inner cylinder is provided with the first jacket so as to form a first cooling cavity between the first inner cylinder and the first jacket, the first cooling cavity is communicated with a cooling medium, and the spray pipe is fixedly arranged in the first inner cylinder at a position close to the upper end so as to spray water into the first inner cylinder from the upper end of the first inner cylinder.

2. The fluidized bed tail gas enhanced cooling system of claim 1, characterized in that: the washing unit further comprises a first washing tank, a second washing tank and a third washing tank, an outlet of the first washing tank is connected with an inlet of the second washing tank, an outlet of the second washing tank is connected with an inlet of the third washing tank, and an outlet of the third washing tank is connected with the lower end of the first inner cylinder.

3. The fluidized bed tail gas enhanced cooling system of claim 2, characterized in that: the washing unit further comprises an electric precipitator, and the upper end of the first inner cylinder is connected with an inlet of the electric precipitator.

4. The fluidized bed tail gas enhanced cooling system of claim 2, characterized in that: the fluidized bed tail gas enhanced cooling system further comprises a heat exchanger, wherein the heat exchanger comprises a second inner cylinder and a second jacket, the outer wall of the second inner cylinder is provided with the second jacket, so that a second cooling cavity is formed between the second inner cylinder and the second jacket, and the upper end of the second inner cylinder is connected with an inlet of the first washing tank.

5. The fluidized bed tail gas enhanced cooling system of claim 4, wherein: the heat exchanger also comprises a spiral partition plate, and the spiral partition plate is a spiral plate formed between the outer wall of the second inner cylinder and the inner wall of the second jacket along the axial direction of the second inner cylinder.

6. The fluidized bed tail gas enhanced cooling system of claim 2, characterized in that: the fluidized bed tail gas enhanced cooling system further comprises a fluidized bed, and a gas phase outlet of the fluidized bed is connected with the lower end of the second inner cylinder.

7. The fluidized bed tail gas enhanced cooling system of claim 6, characterized in that: the fluidized bed tail gas strengthening and cooling system further comprises a gas preheating unit, the gas preheating unit comprises a mixing pipe, one end of the mixing pipe is used for blowing air, and the other end of the mixing pipe is connected with a gas phase inlet of the fluidized bed.

8. The fluidized bed tail gas enhanced cooling system of claim 7, wherein: the gas preheating unit further comprises a hydrogen fluoride gas pipe, one end of the hydrogen fluoride gas pipe is used for blowing hydrogen fluoride gas, and the other end of the hydrogen fluoride gas pipe is communicated with the inner cavity of the mixing pipe.

9. The fluidized bed tail gas enhanced cooling system of claim 1, characterized in that: the first inner cylinder is a graphite pipe.

10. The fluidized bed tail gas enhanced cooling system of claim 6, characterized in that: the fluidized bed tail gas strengthening and cooling system further comprises an aluminum hydroxide bin, and an outlet of the aluminum hydroxide bin is connected with a solid phase inlet of the fluidized bed.