CN214319732U - A strengthen oxidation system for white mud wet flue gas desulfurization - Google Patents

Abstract

The utility model provides a strengthen oxidation system for lime mud wet flue gas desulfurization, including air, oxidation fan, micro-nano bubble generator, the technology water tank, the desulfurizing tower entry, oxidation wind female pipe, oxidation wind branch pipe, orifice, its characterized in that, the air supply of oxidation fan is the air, oxidation fan and technology water tank link to each other with micro-nano bubble generator respectively, micro-nano bubble generator links to each other with the desulfurizing tower, oxidation wind female pipe and oxidation wind branch pipe are perpendicular and along the symmetrical arrangement of tower central line with the same horizontal plane isodiametric or reducing under the desulfurizing tower thick liquid pond liquid level, the main pipe of oxidation wind arranges 1-3, the orifice slant is two rows down arranges. The system has simple process flow, can effectively improve the mass transfer efficiency of the oxidizing wind and the oxidation efficiency of the calcium sulfite, reduce the influence of the soluble salt of the white mud on the oxidation efficiency, prolong the service life of the oxidation system, improve the desulfurization efficiency and the comprehensive utilization value of the gypsum, and can realize better economic benefit and social benefit.

Description

A strengthen oxidation system for white mud wet flue gas desulfurization

Technical Field

The utility model belongs to the atmosphere pollution control field, concretely relates to a strengthen oxidation system for white mud wet flue gas desulfurization.

Background

Limestone-gypsum wet desulphurization is the most mature, reliable and widely applied flue gas desulphurization technology, but the limestone-gypsum wet process, which adopts limestone as a desulfurizer, consumes a large amount of limestone and damages vegetation and ecological environment, and the consumption of limestone accounts for a large proportion of the total desulphurization cost. With the increasing economic benefit pressure and environmental protection pressure of power plants, a substitute desulfurizing agent is urgently needed to be found.

A large amount of white mud is generated in the production process of paper pulp in a paper mill, the main components of the white mud are CaCO3, a small amount of alkaline hydroxide and acidic insoluble substances, and the white mud is used as a desulfurizing agent to remove SO2 in flue gas, SO that the wet desulfurization cost can be effectively reduced, the aim of treating waste by waste can be achieved, and industrial ecological economy is established in power plants and paper making enterprises. When the white mud is used as a wet flue gas desulfurizer, the content of soluble salt in the slurry is too high, which affects CaSO₃The oxidation of the gypsum causes that the gypsum is difficult to dehydrate, the water content exceeds the standard, byproducts are difficult to utilize, the desulfurization efficiency is reduced, and the discharge amount of wastewater is increased.

At present, the white mud desulfurization process and the white mud modification are reported more, the reports on enhancing the oxidation capacity of an oxidation system are less, the oxidation system commonly used in the limestone-gypsum process is a spray gun type or a pipe network type, the distribution of oxidation air of the spray gun type is uneven, bubbles are large, and an oxidation blind area exists; the pipe-network type spray pipe is easy to block or break. The utility model aims at providing a strengthen oxidation system for white mud wet flue gas desulfurization strengthens CaSO₃By oxidation, the desulfurization efficiency is improved andthe comprehensive utilization value of the gypsum realizes better economic benefit and social benefit.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a strengthen oxidation system for white mud wet flue gas desulfurization can effectively improve the oxidation efficiency of calcium sulfite, reduces the influence of white mud soluble salt to oxidation efficiency, improves the comprehensive utilization value of desulfurization efficiency and gypsum, can realize better economic benefits and social.

In order to solve the above problem, the utility model adopts the following technical scheme: the utility model provides a strengthen oxidation system for white mud wet flue gas desulfurization, including air 1, oxidation fan 2, micro-nano bubble generator 3, process water tank 4, desulfurizing tower 5, desulfurizing tower entry 6, oxidation wind entry 7, oxidation wind female pipe 8, oxidation wind branch pipe 9, orifice 10, the air supply of oxidation fan is the air, oxidation fan and process water tank link to each other with micro-nano bubble generator respectively, micro-nano bubble generator links to each other with the desulfurizing tower, the oxidation wind entry is arranged in the opposite side of desulfurizing tower entry, two double-row radial or reducing vertical and along tower central line symmetrical arrangement of the same horizontal plane below the desulfurizing tower thick liquid pond of oxidation wind female pipe, the arrangement quantity of oxidation wind female pipe is 1-3, the orifice slant is arranged down.

Air is pressurized and heated by an oxidation fan and then enters a micro-nano bubble generator to form a micro-nano bubble water system with synchronously entering process water, the micro-nano bubble water system obliquely and downwards enters a slurry pool through an oxidation air main pipe, an oxidation air branch pipe and a spray hole, and CaSO3 is oxidized into CaSO 4. The micro-nano bubbles are small in size, and when the inside of the bubbles is subjected to self-pressurization, the internal pressure is continuously increased, so that the gas inside the bubbles is promoted to penetrate through a gas-liquid interface and be dissolved into a liquid phase, the influence of soluble salts in white mud slurry on the mass transfer resistance of the oxidizing wind is reduced, and the mass transfer efficiency of the oxidizing wind is improved; the micro-nano bubbles are small in size, the buoyancy force borne by the micro-nano bubbles is correspondingly small, the rising speed is reduced, meanwhile, the micro-nano bubbles are obliquely sprayed downwards from the spray holes, and the retention time of oxidizing air in the slurry tank is prolonged; the micro-nano bubbles have small size, large specific surface area and large gas-liquid contact area, and the oxidation rate of CaSO3 is improved.

In the enhanced oxidation system for wet desulphurization of white mud, the micro-nano bubble generator generates micro-nano bubbles by one of a shearing method, a pressurizing and dissolving method and an electrolytic method, and the diameter of each micro bubble is 0.1-50 μm.

In the aforementioned enhanced oxidation system for wet desulphurization of white mud, the oxidizing air inlet is on the opposite side of the inlet of the desulphurization tower to ensure the uniformity of the distribution of the oxidizing air; the oxidation air main pipes and the oxidation air branch pipes are vertically arranged in the same horizontal plane below the liquid level of the desulfurization tower slurry pool in an equal diameter or variable diameter mode, the number of the oxidation air main pipes is 1-3, and the oxidation air main pipes and the oxidation air branch pipes are symmetrically arranged along the center line of the desulfurization tower, so that the length of pipelines of the oxidation air pipes is reduced, the system resistance is reduced, and the risk of breakage of the oxidation air pipes is reduced; two rows of spray holes are arranged on the oblique lower side of the oxidizing air branch pipe in an axial symmetry mode along the height direction of the desulfurizing tower, so that the retention time of oxidizing air is prolonged, and the risk of blockage of an oxidizing air pipe is reduced.

Compared with the prior art, the utility model discloses a micro-nano bubble generator makes air and process water into micro-nano bubble water system, and micro-nano bubble size is little, can improve the mass transfer efficiency of oxidizing wind and CaSO 3's oxidation rate, solves in the white mud thick liquid because of the too high problem that leads to CaSO3 to oxidize inadequately of soluble salt, improves the comprehensive utilization value of gypsum; the main oxidizing air pipes and the branch oxidizing air pipes are arranged on the same horizontal plane below the liquid level of the slurry pool of the desulfurization tower in an equal-diameter or variable-diameter mode and are arranged symmetrically along the center line of the tower, the number of the main oxidizing air pipes is 1-3, and the spray holes are arranged in a downward double-row mode in an inclined mode, so that the problems of breakage and blockage of the oxidizing air pipes are solved, and the service life of an oxidizing system is prolonged.

Drawings

FIG. 1 is a schematic flow diagram of an enhanced oxidation system for wet desulfurization of white mud.

FIG. 2 is a schematic diagram of the distribution of the oxidation ductwork of an enhanced oxidation system for wet desulfurization of white mud.

In the above figures, 1 is air, 2 is an oxidation fan, 3 is a micro-nano bubble generator, 4 is a process water tank, 5 is a desulfurizing tower, 6 is an inlet of the desulfurizing tower, 7 is an inlet of oxidation air, 8 is a main oxidation air pipe, 9 is a branch oxidation air pipe, and 10 is a spray hole.

Detailed Description

The present invention will be further explained with reference to the following embodiments, and features in the embodiments and embodiments of the present invention can be combined with each other without conflict. It should be noted that modifications and variations can be made to the present invention by those skilled in the art without departing from the principles of the present invention, but these modifications and variations also fall within the scope of the claims of the present invention.

As shown in fig. 1, the enhanced oxidation system for wet desulphurization of white mud comprises air 1, an oxidation fan 2, a micro-nano bubble generator 3, a process water tank 4, a desulphurization tower 5, a desulphurization tower inlet 6, an oxidation air inlet 7, an oxidation air main pipe 8, an oxidation air branch pipe 9 and a spray hole 10, wherein the air source of the oxidation fan is air, the air enters the micro-nano bubble generator after being pressurized and heated by the oxidation fan, and forms a micro-nano bubble water system with synchronously entering process water, the diameter of the micro-nano bubbles is 0.1-50 μm, the size of the micro-nano bubbles is small, the mass transfer efficiency of the oxidation air and the oxidation rate of CaSO3 can be improved, the oxidation air enters the oxidation air main pipe from the opposite side of the desulphurization tower inlet, then enters a slurry pool through the oxidation air branch pipe and the spray hole obliquely downwards, the oxidation air flows to the bottom of the tower first, then, the retention time of the oxidation air in slurry is increased, the oxidation rate of CaSO3 is improved.

Claims (1)

1. The utility model provides a strengthen oxidation system for white mud wet flue gas desulfurization, including air (1), oxidation fan (2), micro-nano bubble generator (3), process water tank (4), desulfurizing tower (5), desulfurizing tower entry (6), oxidation wind entry (7), female pipe of oxidation wind (8), oxidation wind branch pipe (9), orifice (10), its characterized in that, the air supply of oxidation fan is the air, oxidation fan and process water tank link to each other with micro-nano bubble generator respectively, micro-nano bubble generator links to each other with the desulfurizing tower, the opposite side at the desulfurizing tower entry is arranged to the oxidation wind entry, female pipe of oxidation wind and oxidation wind branch pipe are in same horizontal plane isodiametric or reducing perpendicular and along tower central line symmetrical arrangement under desulfurizing tower thick liquid pond liquid level, the female pipe of oxidation wind arranges the quantity and is 1-3, the orifice slant is two rows down arranges.

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