An alkaline dust absorption system containing sodium carbonate powder

Abstract

This invention provides an alkaline dust absorption system containing sodium carbonate powder, comprising an absorption tower. The top of the absorption tower is equipped with an inlet pressure gauge, and the interior contains, from top to bottom, a dust collection mesh and a spray distribution pipe. The sides of the absorption tower are respectively equipped with a circulation pump, a dynamic wave feed pipe, a fan, and a sewage pump connected to them. Alkaline dust is introduced into the inlet of the dynamic wave feed pipe, and the interior contains, from top to bottom, a primary dynamic wave nozzle and a secondary dynamic wave nozzle. The primary dynamic wave nozzle is connected to the circulation pump via a primary dynamic wave regulating valve, and a primary dynamic wave pressure gauge is installed on the pipeline between them. The secondary dynamic wave nozzle is connected to the circulation pump via a secondary dynamic wave regulating valve. This invention employs a "two-stage dynamic wave absorption + primary spray absorption" system to achieve efficient collection and treatment of alkaline dust such as NaOH and KOH particles and aerosols generated by the alkali dissolving system.

Description

Technical Field

[0001] This utility model belongs to the field of alkaline dust absorption technology, and relates to an alkaline dust absorption system containing sodium carbonate powder. Background Technology

[0002] In alkali dissolution processes in fields such as hydrometallurgy, the crushing, dissolution, and storage of solid alkali (such as caustic soda flakes and granules) easily generate a large amount of alkali dust, mainly consisting of highly corrosive particles and aerosols such as NaOH and KOH. This alkali dust escapes into the production environment through open points such as reactor breather ports and material conveying interfaces, affecting operational safety, equipment lifespan, and environmental protection. Specific defects are as follows:

[0003] (1) Insufficient efficiency of traditional spray towers: Conventional spray towers rely on the inertial collision between droplets and dust to capture alkaline dust, but the capture efficiency for fine particles such as aerosol alkaline dust with a particle size <5μm is insufficient, usually less than 80%. Moreover, the uneven distribution of droplet size easily leads to limited gas-liquid contact area. Under high concentration of alkaline dust, the pH value of the spray liquid rises rapidly, the consumption of neutralizing agent increases dramatically, and the operating cost is high.

[0004] (2) Poor applicability of physical filtration technology: Existing bag filters are prone to filter material caking and clogging in humid alkaline environments, requiring frequent replacement of filter bags and high maintenance costs. Although electrostatic precipitators have a certain effect on fine particles, high humidity alkaline dust can easily cause discharge electrode corrosion and poses a high voltage safety hazard.

[0005] Against this backdrop, there is an urgent need to develop a highly efficient treatment system for the characteristics of alkali dust in alkali dissolving systems, so as to achieve full-process control from source dispersion to end emission, ensure that both workshop environment and exhaust gas concentration meet the standards, reduce operating energy consumption and maintenance costs, and adapt to the needs of continuous production. Utility Model Content

[0006] The purpose of this invention is to address the problems existing in the prior art by providing an alkaline dust absorption system containing sodium carbonate powder. This system solves the problem that the alkaline dust absorption rate in the alkali dissolving system is insufficient, causing alkaline dust to escape into the production environment through open points such as the reactor's breather and material conveying interface, which affects operational safety, equipment lifespan, and environmental protection.

[0007] Therefore, the present invention adopts the following technical solution:

[0008] An alkaline dust absorption system containing sodium carbonate powder includes an absorption tower, which is equipped with a level gauge, a pH meter and an automatic water supply valve; the top of the absorption tower is equipped with an inlet pressure monitoring gauge, and the inside is equipped with a foam trap and a spray cloth pipe from top to bottom, with several spiral nozzles arranged in parallel at the bottom of the spray cloth pipe.

[0009] The absorption tower is equipped with a circulating pump, a power wave feed pipe, a blower, and a sewage pump connected to it; the blower is equipped with a blower inlet pressure monitoring gauge.

[0010] Alkali dust is introduced at the inlet of the dynamic wave feed pipe, and the inside is equipped with a primary dynamic wave nozzle and a secondary dynamic wave nozzle from top to bottom; wherein:

[0011] The primary dynamic wave nozzle is connected to the circulating pump through a primary dynamic wave regulating valve, and a primary dynamic wave pressure monitoring gauge is installed on the pipeline between the two.

[0012] The secondary dynamic wave nozzle is connected to the circulating pump through a secondary dynamic wave regulating valve, and a secondary dynamic wave pressure monitoring gauge is installed on the pipeline between the two.

[0013] The circulating pump and the absorption tower are connected by a spray regulating valve, and the pipeline connecting the two is equipped with a spray pressure monitoring gauge.

[0014] The absorption tower is equipped with a sewage pump on its side, which is interlocked with the level gauge and pH meter respectively; the level gauge is interlocked with the automatic water supply valve; and the inlet pressure monitoring gauge is interlocked with the fan.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model utilizes a multi-stage synergistic purification system consisting of "two-stage dynamic wave absorption + one-stage spray absorption" to efficiently capture and deeply treat alkaline dust such as NaOH and KOH particles and aerosols generated by the alkali dissolving system. Combined with the circulation management of the absorbent liquid, it achieves excellent absorption results in alkaline dust treatment. Specifically:

[0017] 1. This utility model improves the collection efficiency of fine particles and aerosols by setting up a two-stage dynamic wave absorption device and using turbulent liquid curtain to intercept alkaline dust particles and gaseous alkaline substances of different sizes. Combined with the deep purification of the spray tower, it improves the overall dust removal efficiency of the system.

[0018] 2. In this utility model, the absorbent achieves precise neutralization through closed-loop pH control, and the waste liquid can be transported to subsequent processes to recover alkaline substances, which greatly reduces wastewater discharge and hazardous waste treatment burden. The closed-loop negative pressure operation of the system inhibits the emission of alkaline dust from the source, significantly improving the air quality in the workshop. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the system of this utility model.

[0020] In the diagram, 1-circulating pump, 2-level gauge, 3-pH meter, 4-secondary dynamic wave nozzle, 5-secondary dynamic wave regulating valve, 6-secondary dynamic wave pressure monitor, 7-primary dynamic wave nozzle, 8-primary dynamic wave regulating valve, 9-primary dynamic wave pressure monitor, 10-spray regulating valve, 11-spray pressure monitor, 12-dynamic wave feed pipe, 13-alkali dust, 14-inlet pressure monitor, 15-foam trap, 16-spray liquid distribution pipe, 17-spiral nozzle, 18-fan inlet pressure monitor, 19-fan, 20-sewage pump, 21-automatic water supply valve, 22-absorption tower. Detailed Implementation

[0021] The technical solution of this utility model will be described below with reference to the accompanying drawings and implementation methods.

[0022] like Figure 1 As shown, an alkaline dust absorption system containing sodium carbonate powder includes: an absorption tower 22, with an inlet pressure monitoring gauge 14 at the top of the absorption tower 22, and a foam trap 15 and a spray liquid pipe 16 arranged sequentially from top to bottom inside the absorption tower 22. The bottom of the spray liquid pipe 16 is provided with several spiral nozzles 17 arranged in parallel. The inlet pressure monitoring gauge 14 is used to determine whether the tank inside the plant is under negative pressure. The foam trap 15 is used to eliminate gas-carried foam, further reducing the moisture carried by the alkaline dust and reducing the amount of absorbent liquid discharged from the tower.

[0023] The absorption tower 22 is equipped with a circulating pump 1, a dynamic wave feed pipe 12, a blower 19, and a sewage pump 20 connected to it. Alkali dust 13 is introduced into the inlet of the dynamic wave feed pipe 12, and a primary dynamic wave nozzle 7 and a secondary dynamic wave nozzle 4 are arranged from top to bottom inside the pipe. The primary dynamic wave nozzle 7 is connected to the circulating pump 1 through a primary dynamic wave regulating valve 8, and a primary dynamic wave pressure monitoring gauge 9 is installed on the pipeline between the two. The secondary dynamic wave nozzle 4 is connected to the circulating pump 1 through a secondary dynamic wave regulating valve 5, and a secondary dynamic wave pressure monitoring gauge 6 is installed on the pipeline between the two.

[0024] Specifically, the outlet of circulating pump 1 is divided into three lines:

[0025] Line I: The circulating pump delivers the absorbent liquid in the tower to the first-stage dynamic wave nozzle 7. The first-stage dynamic wave pressure monitoring gauge 9 reflects the flow rate of the first-stage dynamic wave. The flow rate is adjusted by the first-stage dynamic wave regulating valve 8. The first-stage dynamic wave regulating valve 8 adjusts the flow rate at the dynamic wave by adjusting the valve opening.

[0026] Line II: Circulating pump 1 delivers the absorbent liquid in the tower to the secondary dynamic wave nozzle 4. The secondary dynamic wave pressure monitor 6 reflects the flow rate of the secondary dynamic wave. The flow rate is adjusted by the secondary dynamic wave regulating valve 5. The secondary dynamic wave regulating valve 5 adjusts the flow rate at the dynamic wave by adjusting the valve opening.

[0027] Line III: The circulating pump 1 delivers the liquid to the spray distribution pipe 16 of the tower body, and the absorbent liquid is evenly atomized through the spiral nozzle 17 to further absorb the alkaline dust 13. The spray pressure monitoring gauge 11 reflects the spray flow rate, which is adjusted by the spray regulating valve 10.

[0028] The absorption tower 22 is equipped with a level gauge 2, a pH meter 3 and an automatic water supply valve 21; the circulating pump 1 is connected to the absorption tower 22 through a spray regulating valve 10, and the pipeline connecting the two is equipped with a spray pressure monitoring gauge 11.

[0029] A sewage pump 20 is installed on the side of the absorption tower 22. It is interlocked with the liquid level gauge 2 and the pH meter 3. When the liquid level in the tower is higher than the set liquid level, the sewage pump 20 starts to transport the liquid in the tower to the next process. When the pH value is higher than the set value, the sewage pump 20 starts to transport the liquid in the tower to the next process.

[0030] The blower 19 is equipped with a blower inlet pressure monitoring gauge 18; the inlet pressure monitoring gauge 14 is interlocked with the blower 19, so that the negative pressure in the production system is maintained at a set value. When it is lower than the set value, the frequency slowly decreases, and when it is higher than the set value, the frequency gradually increases.

[0031] The level gauge 2 and the automatic water supply valve 21 are interlocked. When the tower liquid level is lower than the lower limit setting value, the automatic water supply valve 21 opens, and when the liquid level is higher than the setting value, the automatic water supply valve 21 closes.

[0032] The usage process of this utility model is as follows:

[0033] Alkali dust 13 enters the absorption tower 22 from top to bottom through the dynamic wave feed pipe 12;

[0034] Circulating pump 1 delivers the liquid in absorption tower 22 to power feed pipe 12;

[0035] The liquid in the absorption tower 22 is discharged by the primary dynamic wave nozzle 7 and the secondary dynamic wave nozzle 4. The liquid rises from bottom to top, forming a gas-liquid two-phase zone. In this zone, the liquid and gas collide with each other, the gas is enveloped by the liquid, and the alkaline dust 13 dissolves in the absorption liquid and the gas enters the absorption tower 22.

[0036] The internal spray of the absorption tower 22 atomizes the absorbent liquid through the spiral nozzle 17, thereby further absorbing the alkaline dust 13.

Claims

1. An alkaline dust absorption system containing sodium carbonate powder, characterized in that, The absorption tower (22) is provided with an inlet pressure monitoring gauge (14) at the top and a foam trap (15) and a spraying liquid pipe (16) arranged from top to bottom inside the absorption tower (22). The absorption tower (22) is equipped with a circulating pump (1), a power wave feed pipe (12), a fan (19) and a sewage pump (20) connected to it on its side. Alkali dust (13) is introduced into the inlet of the power wave feed pipe (12), and the inside is provided with a first-stage power wave nozzle (7) and a second-stage power wave nozzle (4) from top to bottom. The primary power wave nozzle (7) is connected to the circulating pump (1) through the primary power wave regulating valve (8), and a primary power wave pressure monitoring gauge (9) is installed on the pipeline between the two. The secondary dynamic wave nozzle (4) is connected to the circulating pump (1) through the secondary dynamic wave regulating valve (5), and a secondary dynamic wave pressure monitoring gauge (6) is installed on the pipeline between the two.

2. The alkaline dust absorption system containing sodium carbonate powder according to claim 1, characterized in that, The absorption tower (22) is equipped with a level gauge (2), a pH meter (3) and an automatic water supply valve (21).

3. The alkaline dust absorption system containing sodium carbonate powder according to claim 1, characterized in that, The circulating pump (1) is connected to the absorption tower (22) through a spray regulating valve (10), and the pipeline connecting the two is equipped with a spray pressure monitoring gauge (11).

4. The alkaline dust absorption system containing sodium carbonate powder according to claim 2, characterized in that, The absorption tower (22) is equipped with a sewage pump (20) on its side, which is interlocked with the level gauge (2) and pH meter (3).

5. The alkaline dust absorption system containing sodium carbonate powder according to claim 1, characterized in that, The bottom of the spray pipe (16) is provided with several spiral nozzles (17) arranged in parallel.

6. The alkaline dust absorption system containing sodium carbonate powder according to claim 1, characterized in that, The fan (19) is equipped with a fan inlet pressure monitoring gauge (18).

7. The alkaline dust absorption system containing sodium carbonate powder according to claim 2, characterized in that, The level gauge (2) and the automatic water supply valve (21) are interlocked.

8. The alkaline dust absorption system containing sodium carbonate powder according to claim 1, characterized in that, The inlet pressure monitoring meter (14) is interlocked with the fan (19).

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