CN116809235A - System and method for purifying and circulating acid-making flue gas - Google Patents

Abstract

The invention discloses an acid-making flue gas purification circulation system and a purification method. The circulation system includes: an electric demister, a second-level power wave, a first-level power wave, a gas cooling tower, an accident water high-level tank and an overflow weir. The liquid outlet of the electric demister is connected to the liquid inlet of the secondary power wave; the liquid outlet of the secondary power wave is connected to the liquid inlet of the primary power wave; the air inlet of the gas cooling tower is connected to the primary power wave. The waves are connected; the liquid outlet of the gas cooling tower is connected with the liquid inlet of the accident water high-level tank; the liquid outlet of the accident water high-level tank is connected with the liquid inlet of the overflow weir, and the liquid outlet of the overflow weir is connected with the liquid inlet of the overflow weir. The liquid inlets of the first-level power wave are connected. The purification circulation system in the present invention can reduce the dust content of the circulating liquid and improve production efficiency.

Description

Acid-making flue gas purification circulation system and purification method

Technical field

The present invention relates to the technical field of dust removal, and more specifically to an acid-making flue gas purification circulation system and a purification method.

Background technique

In the current industrial production of sulfuric acid, many flue gas purification methods take the form of dilute acid cycle pickling. This pickling method has strong adaptability, easy operation, reliable technology, adjustable acid emission, and stable flue gas purification effect indicators. The generally used process flow is: first-level power wave - gas cooling tower - second-level power wave - two-stage electric demister purification method to remove dust, impurities, acid mist, heat, etc. in the flue gas. Because the flue gas temperature is high, a high-level tank is basically set up in the purification section to be filled with clean water or circulating dilute acid. When the first-level power wave circulation pump stops, the liquid in the high-level tank can be used to protect the flue gas pipeline, but the accident When the water high-level tank uses first-level dynamic wave circulating fluid, the first-level dynamic wave circulating fluid contains large dust and blocks the accident water pipe, which may cause damage to the flue gas pipeline.

Therefore, developing an acid-making flue gas purification circulation system and purification method that can reduce the dust content of the circulating liquid and improve production efficiency is an urgent problem that those skilled in the art need to solve.

Contents of the invention

In view of this, the present invention provides an acid-making flue gas purification circulation system and a purification method that can reduce the dust content of the circulating liquid and improve production efficiency.

In order to achieve the above objects, the present invention adopts the following technical solutions:

An acid-making flue gas purification cycle system, including:

electric defogger,

Secondary power wave, the liquid outlet of the electric demister is connected with the liquid inlet of the secondary power wave;

A first-level power wave, the liquid outlet of the second-level power wave is connected with the liquid inlet of the first-level power wave;

A gas cooling tower, the air inlet of the gas cooling tower is connected with the first-level power wave;

A high-level accident water tank, the liquid outlet of the gas cooling tower is connected with the liquid inlet of the high-level accident water tank;

Overflow weir, the liquid outlet of the accident water high-level tank is connected with the liquid inlet of the overflow weir, and the liquid outlet of the overflow weir is connected with the liquid inlet of the primary power wave.

The beneficial effect of adopting the above technical solution is that the circulating liquid in the gas cooling tower of the present invention contains very little dust. The circulating liquid in the gas cooling tower is replenished into the accident water high-level tank, which can avoid clogging the accident water high-level tank. Can improve production efficiency.

Preferably, the liquid inlet of the secondary power wave is connected to the new water supply pipeline. When the circulating fluid in the secondary power wave is insufficient, new water can be replenished into the secondary power wave through the new water supply pipeline.

Preferably, the liquid outlet of the first-stage power wave is connected to a conical settling tank. Excess water in the first-level dynamic wave can be discharged into the conical settling tank.

Preferably, the liquid outlet of the conical settling tank is connected to a dilute acid tank.

Preferably, the liquid outlet of the dilute acid tank is connected to a waste acid treatment tank.

A purification method for an acid-making flue gas purification cycle system, including the following purification steps:

1) The acid mist and part of the moisture in the flue gas collected by the electric demister flow into the secondary power wave through the pipeline. When the liquid level of the secondary power wave is higher than 1.8m, open the acid string valve to circulate the excess The liquid is transported into the first-level power wave;

2) Because the first-level dynamic wave acts as adiabatic cooling, a large amount of water vapor is brought into the gas cooling tower from the flue gas, which increases the liquid level in the gas cooling tower. After the liquid level in the gas cooling tower increases, the circulating liquid will be transported Go to the accident water high-level tank;

3) Open the regulating valve at the liquid outlet of the accident water high-level tank. The circulating liquid in the accident water high-level tank will flow into the overflow weir, and the water in the overflow weir will enter the first-level dynamic wave to form a cycle;

4) During the circulation process, the excess water generated by the first-level dynamic wave will enter the conical settling tank, and the liquid overflow from the conical settling tank will enter the dilute acid tank, and then be transported by the pump to the sewage acid treatment tank for treatment.

Preferably, the liquid levels of the first-stage power wave and the second-stage power wave are 1-1.8 mm.

Preferably, the liquid level of the gas cooling tower is 1-2mm; the liquid level of the accident water high-level tank is 1.5-2m.

It can be seen from the above technical solutions that compared with the existing technology, the present invention provides an acid-making flue gas purification circulation system and a purification method, and its beneficial effects are:

(1) In the present invention, the circulating liquid in the gas cooling tower with the smallest dust content in the circulating liquid of each tank is used as the water supply for the accident water high-level tank, which avoids clogging the accident water high-level tank and improves production efficiency;

(2) The circulation system in the present invention has strong adaptability, simple operation, low operating cost, and the overall circulating liquid acid flow is smoother.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of the purification circulation system provided by the present invention.

Among them, in the figure,

1-Electric demister; 2-Second-level power wave; 3-First-level power wave; 4-Gas cooling tower; 5-Accident water high-level tank; 6-Overflow weir; 7-New water supply pipeline; 8- Conical settling tank; 9-dilute acid tank; 10-sewage acid treatment tank.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The embodiment of the present invention discloses an acid-making flue gas purification circulation system, which includes:

Electric defogger 1,

Secondary power wave 2, the liquid outlet of the electric demister 1 is connected with the liquid inlet of the secondary power wave 2;

The liquid outlet of the first-level power wave 3 and the second-level power wave 2 is connected with the liquid inlet of the first-level power wave 3;

Gas cooling tower 4, the air inlet of the gas cooling tower 4 is connected with the first-level power wave 3;

The accident water high-level tank 5, the liquid outlet of the gas cooling tower 4 is connected with the liquid inlet of the accident water high-level tank 5;

The overflow weir 6, the liquid outlet of the accident water high level tank 5 is connected with the liquid inlet of the overflow weir 6, and the liquid outlet of the overflow weir 6 is connected with the liquid inlet of the primary power wave 3. The circulating acid liquid enters the second-level power wave 2 from the electric demister 1. When the circulating liquid of the second-level power wave 2 is insufficient, new water can be added, and then directly enters the first-level power wave 3, and the circulating liquid of the gas cooling tower 4 enters The accident water high-level tank 5 flows through the overflow weir 6 and enters the first-level power wave 3. After the circulating liquid of the first-level power wave 3 enters the conical settling tank 8, it overflows into the dilute acid tank 9 for waste acid treatment, forming a New circulation system for circulating fluid.

In order to further optimize the above technical solution, the liquid inlet of the secondary power wave 2 is connected with the new water supply pipeline 7 .

In order to further optimize the above technical solution, the liquid outlet of the primary power wave 3 is connected to a conical settling tank 8 . The first-level power wave 3 discharges excess water into the conical settling tank 8. After overflow, it enters the dilute acid tank 9 and is pumped to the waste acid treatment for treatment.

In order to further optimize the above technical solution, the liquid outlet of the conical settling tank 8 is connected to a dilute acid tank 9 .

In order to further optimize the above technical solution, the liquid outlet of the dilute acid tank 9 is connected to a sewage acid treatment tank 10 .

A purification method for an acid-making flue gas purification cycle system, including the following purification steps:

1) The acid mist and part of the moisture in the flue gas collected by the electric demister 1 flow into the secondary power wave 2 through the pipeline. When the liquid level of the secondary power wave 2 is higher than 1.8m, open the acid string valve and The excess circulating fluid is transported to the first-level power wave 3;

2) Since the function of the primary dynamic wave 3 is adiabatic cooling, a large amount of water vapor is brought into the gas cooling tower 4 by the flue gas, causing the liquid level in the gas cooling tower 4 to increase. After the liquid level in the gas cooling tower 4 increases, it will Transport the circulating fluid to the accident water high-level tank 5;

3) Open the regulating valve at the liquid outlet of the accident water high-level tank 5. The circulating liquid in the accident water high-level tank 5 will flow into the overflow weir 6, and the water in the overflow weir 6 will enter the first-level dynamic wave 3. form a cycle;

4) During the circulation process, the excess water generated by the first-level dynamic wave 3 will enter the conical settling tank 8. The liquid overflow from the conical settling tank 8 will enter the dilute acid tank 9, and then be transported to the sewage acid treatment tank by the pump. Processed within 10 days.

In order to further optimize the above technical solution, the arrow in Figure 1 indicates the flow direction of the circulating liquid. The flue gas in the first-level power wave 3 will not carry dust. The flue gas in the first-level power wave 3 enters the gas cooling tower. 4, no dust will enter the gas cooling tower 4.

In order to further optimize the above technical solution, since the purification section is a semi-adiabatic cooling, the first-level power wave 3 loses the most water, while the gas cooling tower 4 collects the most water, so the gas cooling tower 4 does not need to add new water to maintain the liquid level.

In order to further optimize the above technical solution, the liquid levels of the first-level power wave 3 and the second-level power wave 2 are 1-1.8mm.

In order to further optimize the above technical solution, the liquid level of the gas cooling tower 4 is 1-2mm; the liquid level of the accident water high-level tank 5 is 1.5-2m.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An acid-making flue gas purification circulation system, which is characterized in that it includes: Electric defogger(1), Secondary power wave (2), the liquid outlet of the electric demister (1) is connected with the liquid inlet of the secondary power wave (2); First-level power wave (3), the liquid outlet of the second-level power wave (2) is connected with the liquid inlet of the first-level power wave (3); Gas cooling tower (4), the air inlet of the gas cooling tower (4) is connected with the first-level power wave (3); Accident water high level tank (5), the liquid outlet of the gas cooling tower (4) is connected with the liquid inlet of the accident water high level tank (5); Overflow weir (6), the liquid outlet of the accident water high-level tank (5) is connected with the liquid inlet of the overflow weir (6), and the liquid outlet of the overflow weir (6) is connected with the primary power The liquid inlets of wave (3) are connected. 2. An acid-making flue gas purification circulation system according to claim 1, characterized in that the liquid inlet of the secondary power wave (2) is connected with the new water replenishment pipeline (7). 3. An acid-making flue gas purification circulation system according to claim 2, characterized in that the liquid outlet of the first-stage power wave (3) is connected to a conical settling tank (8). 4. An acid-making flue gas purification circulation system according to claim 3, characterized in that the liquid outlet of the conical settling tank (8) is connected to a dilute acid tank (9). 5. An acid-making flue gas purification and circulation system according to claim 4, characterized in that the liquid outlet of the dilute acid tank (9) is connected to a dirty acid treatment tank (10). 6. The purification method of an acid-making flue gas purification circulation system according to claims 1-5, characterized in that it includes the following purification steps: 1) The acid mist and part of the moisture in the flue gas collected by the electric demister (1) flow into the secondary power wave (2) through the pipeline. When the liquid level of the secondary power wave (2) is higher than 1.8m, Open the acid series valve and transport the excess circulating fluid to the first-level power wave (3); 2) Because the first-level dynamic wave (3) acts as an adiabatic cooling, a large amount of water vapor is brought into the gas cooling tower (4) by the flue gas, causing the liquid level in the gas cooling tower (4) to increase, and the gas cooling tower (4) ) after the liquid level increases, the circulating fluid will be delivered to the accident water high-level tank (5); 3) Open the regulating valve of the liquid outlet of the accident water high-level tank (5). The circulating liquid in the accident water high-level tank (5) will flow into the overflow weir (6), and the water in the overflow weir (6) will enter. into the first-level dynamic wave (3), forming a cycle; 4) During the circulation process, the excess water generated by the first-level dynamic wave (3) will enter the conical settling tank (8), and the liquid overflow from the conical settling tank (8) will enter the dilute acid tank (9), and then It is transported to the sewage acid treatment tank (10) by a pump for treatment. 7. A purification method for an acid-making flue gas purification circulation system according to claim 6, characterized in that the liquid levels of the first-stage power wave (3) and the second-stage power wave (2) are 1-1.8 mm. 8. A purification method for an acid-making flue gas purification circulation system according to claim 6, characterized in that the liquid level of the gas cooling tower (4) is 1-2mm; the accident water high-level tank (5 ) liquid level is 1.5-2m.