Venturi type desulfurizing device adopting spray drying method and desulfurizing method of desulfurizing device

A technology of spray drying method and desulfurization device, which is applied in the field of environmental engineering, can solve the problems of uniform distribution of flue gas, affect the stability of operation, uniformity and other problems, and achieve the effect of ensuring stability, improving reaction probability and increasing total surface area

Active Publication Date: 2016-09-21
CHINA NAT HEAVY MACHINERY RES INSTCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of the uniform distribution of the flue gas flow field in the desulfurization tower, the uniformity of the sufficient mixing of the desulfurizer and the flue gas, and the easy flow of the reactants and reaction by-products at the nozzles in the traditional spray drying desulfurization technology. The generation of "mushroom heads" and "hanging whiskers" affects the stability of the operation, etc.

Method used

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  • Venturi type desulfurizing device adopting spray drying method and desulfurizing method of desulfurizing device

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Effect test

Embodiment 1

[0031] This embodiment provides a Venturi spray drying desulfurization device, such as figure 1 As shown, it includes the shell 3 of the desulfurization tower. The shell 3 of the desulfurization tower adopts a vertical cylindrical tower-shaped structure. The ash hopper outlet 6 is arranged on the body and the air outlet 7 is arranged on the side wall of the lower part of the tower body; the venturi throat 9 is connected to the upper part of the tower body and the tower body respectively upwards and downwards in a variable diameter connection. In the lower body shell, a nozzle 8 is arranged in the venturi throat 9, and the connecting pipeline of the nozzle 8 passes through the pipe wall of the Venturi throat 9 to externally connect the jet pump and the air compressor.

[0032] The device of this embodiment mainly uses the reactant solution to remove SO in the flue gas through chemical reaction. 2 , the pH value of the solid reaction by-products is neutral or alkaline, no waste...

Embodiment 2

[0034] This embodiment is further improved on the basis of Embodiment 1. The internal cross-sectional area of ​​the Venturi throat 9 is 1 / 3 to 1 / 4 of the internal cross-sectional area of ​​the desulfurization tower shell 3. Due to the rapid reduction of the cross-sectional area , the flue gas velocity is greatly increased.

[0035] The angle between the variable-diameter side wall of the variable-diameter section where the throat of the Venturi pipe 9 is connected to the upper shell of the tower body and the lower shell of the tower body and the flow direction of the flue gas is 45-60°. The diameter change of the upper part of the tower acts as a flow guide to reduce the resistance loss at the venturi throat 9; after the diameter reduction of the lower part of the tower, the flue gas can be evenly distributed in the cross-section of the desulfurization tower under the action of airflow diffusion.

Embodiment 3

[0037] In this embodiment, a dust-scraping device is added on the basis of Embodiment 1 and Embodiment 2. Specifically, a dust-scraping device 4 is provided at the inner wall of the variable-diameter end where the Venturi throat 9 is connected to the upper shell of the tower body.

[0038] The dust scraping device 4 includes a bracket 11, a scraper 12 and a motor 10. The bracket 11 is braced on the inner wall of the upper shell of the tower body, and the scraper 12 is attached to the variable distance between the venturi throat 9 and the upper shell of the tower body. On the inner wall of the radial section, the output shaft of the motor 10 is connected to a vertically arranged transmission shaft 13 with a helical gear at the end through a helical gear, and the other end of the transmission shaft 13 is connected to the scraper 12 through a connecting piece 14, and the transmission shaft 13 passes through Pass the bracket 11 and be installed on the bracket 11 through the bearing...

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Abstract

The invention relates to a venturi type desulfurizing device adopting a spray drying method and a desulfurizing method of the desulfurizing device. A vertical cylindrical tower-shaped structure is adopted, a venturi throat is arranged in the middle of a tower body, and flue gas enters a shell through an upper air inlet and passes through a desulfurizing tower from top to bottom. SO2 in the high-temperature flue gas and a reactant sprayed in through a nozzle are subjected to a chemical reaction, a reaction side product is solid Na2SO3 powder, most of the solid Na2SO3 powder falls into a lower ash bucket, and the rest of the solid Na2SO3 powder is discharged out of the tower body from a lower air outlet of the tower body along with the desulfurized flue gas, enters a subsequent dust removing process and is collected. The PH value of the solid desulfurizing side product is neutral or alkaline, no wastewater is generated in the whole desulfurizing process, and the temperature of the flue gas at an outlet of the desulfurizing tower is higher than the dew point temperature by 15 DEG C or above all the time. The problems that in a traditional desulfurizing technology, flue gas is not distributed uniformly in a flow field of a desulfurizing tower, full mixing of a desulfurizing agent and the flue gas is not uniform, mushroom heads and hair hanging are likely to be formed at a nozzle by a reactant and a reaction side product, and consequently running stability is influenced are solved.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a venturi type spray drying method desulfurization device and a desulfurization method thereof. Background technique [0002] There are three main methods of flue gas desulfurization in industrial kilns: wet method, dry method and semi-dry method. The wet process technology is mature and the desulfurization efficiency is high, but the investment is large, the area is large, the energy consumption and operating costs are high, and waste water and residue are generated, the equipment needs to be considered anti-corrosion, and it is easy to scale; the dry process has low investment costs and desulfurization The product is in a dry state, the equipment is not easy to corrode, scale and blockage are not easy to occur, but the reaction speed is slow and the desulfurization efficiency is low; [0003] The semi-dry process is that the desulfurization agent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
CPCB01D53/504B01D53/505B01D53/78B01D2251/304B01D2251/604B01D2251/606B01D2258/0283
Inventor 艾华张磊边靖赖志强
Owner CHINA NAT HEAVY MACHINERY RES INSTCO
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