Semi-dry desulfurization-Foshan yiqing environmental protection engineering technology co. LTD

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Flue gas denitrification

Ultra Low Emission

PRODUCT NAME

Semi-dry desulfurization

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Semi-dry desulfurization

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It is mainly engaged in industrial dust, industrial flue gas comprehensive treatment, technology research, industrial development and engineering contracting, production and sales of environmental protection equipment, a comprehensive large-scale environmental protection engineering company, is a national high-tech enterprises. It is a professional environmental protection contracting second-class enterprise, and the product quality management system of Yiqing Environmental Protection has obtained ISO9000 certification. Products: desulfurization tower, dust collector, dust removal equipment, catalytic combustion, etc.

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Keywords: sanitation equipment, environmental equipment, environmental services

Keywords: industrial flue gas desulfurization, denitrification, VOCs treatment equipment

Details

Introduction

Semi-dry technology is a simple, low-investment, high-performance desulfurization system with a small footprint and easy accessibility. The semi-dry desulfurization process means that the desulfurizing agent is added in a wet state and the water in the slurry is evaporated using the sensible heat of the flue gas. During the drying process, the desulfurization agent reacts with the sulfur dioxide in the flue gas to produce a dry powder-like product. In order to improve the desulfurization efficiency, lime powder digestion slurry is usually used as the desulfurization agent. The desulfurization end product, desulfurization slag, is a free-flowing dry powder mixture with no secondary pollution and can also be further utilized comprehensively. The process is mainly applied to power station boiler flue gas desulfurization, single tower processing flue gas volume can be applied to boilers with evaporation capacity between 75t/h ~ 1025t/h, SO2 removal rate can reach 90% ~ 98%, is currently dry, semi-dry and other types of desulfurization technology in a single tower processing capacity is the largest, the most superior desulfurization comprehensive benefits of a method.

Working Principle

Flue gas from the boiler air preheater enters the desulfurization tower from the lower part of the tower through the cloth wind device, then the flue gas enters the circulating fluidized bed body through the acceleration of the venturi at the bottom of the desulfurization tower, and the material is in the circulating fluidized bed, the gas-solid two phases produce intense turbulence and mixing due to the action of airflow, fully contact, and in the process of rising, the agglomerates are continuously formed to return downward, and the agglomerates are continuously disintegrated in the intense turbulence Re-lifted by the airflow, making the slip velocity between gas and solid up to tens of times of the single particle slip velocity, making the Ca/S ratio in the bed as high as 87 or more. The flue gas temperature in the reaction process is adjusted to about 70℃ by the sprayed atomized water, and the qualified absorbent (Ca(OH)2) dry powder is pneumatically transported into the absorption tower by the jet pump, and the flue gas is chemically reacted with the desulfurization in the tower, and the large amount of gas-solid mixture is discharged from the top of the absorption tower after the reaction. Such a gas-solid two-phase flow mechanism in the circulating fluidized bed greatly strengthens the mass and heat transfer between gas and solid, which provides a fundamental guarantee for achieving high desulfurization rate.

The purified dusty flue gas is discharged laterally from the top of the desulfurization tower and then turned into the high efficiency dust collector, and then discharged into the stack through the boiler fan. The solid particles trapped by the dust collector are returned to the desulfurization tower through a recirculation system under the dust collector to continue to participate in the reaction, and so on.

Technical Features

Semi-dry flue gas desulfurization technology is to use circulating fluidized bed technology for flue gas purification at the end of the boiler to remove most of the acidic gases in the flue gas, so that the harmful components in the flue gas can meet the emission requirements.

The semi-dry flue gas desulfurization technology has the following characteristics:

(1) A unique venturi is added to the throat of the absorption tower to make the flow field in the tower more uniform.

(2) The upper and lower dual flow nozzles are set in the absorption tower, the atomized particles can reach below 50µm, the precise ash-water ratio ensures good humidification and activation effect, and the controlled temperature in the tower makes the desulfurization reaction take place at the best temperature, so as to achieve higher desulfurization efficiency and longer service life of the filter media.

(3) Adopting more perfect control system than the second generation, the operation is simpler and more convenient.

(4) Adopt mature domestic raw materials and equipment, reduce cost and save investment.

(5) occupy less land, save investment, low operating cost, no secondary pollution.

(6) It is very suitable for the transformation of small and medium-sized boiler desulfurization.

(7) The ash conveying adopts upward-directed warehouse pump, which has small gas consumption, and the ash conveying pipeline is not easy to be blocked and has long service life. At the same time, an intermediate ash bin is added between the bin pump and the bag, which makes the operation of the bin pump more stable and reliable.

Solid materials are collected by the bag filter, and then sent back to the reactor by the air inclined trough, so that the unreacted destructant is repeatedly circulated and the residence time in the reactor is extended, thus improving the utilization rate of the destructant and reducing the operation cost.

According to the needs of flue gas purification, adding the right amount of activated carbon and other additives can change the composition of circulating materials, effectively adsorbing and removing dioxins and heavy metals and other toxic and difficult to remove pollutants to achieve special purification effects. Due to the adoption of a large number of technical improvements and optimization, the third generation of semi-dry flue gas desulfurization technology currently in hand overcomes the shortcomings of the first generation of semi-dry desulfurization devices, such as easy bed collapse, easy wear, high system resistance, unreliable operation and the second generation of semi-dry desulfurization devices, such as easy scaling in the tower and low efficiency, and is characterized by advanced, reliable, high efficiency and low maintenance requirements.

Advantages

(1) Small footprint, saving land resources;

(2) High efficiency of acid removal and dust removal, which can meet the national environmental protection standards for a longer period of time. Desulfurization efficiency ≥ 95% SO2 emission concentration ≤ 200mg / Nm3 Dust removal efficiency ≥ 99.999% soot emission concentration ≤ 30mg / Nm3

(3) simple system, less auxiliary systems, reliable operation, simple operation;

(4) No waste water discharge, no secondary pollution;

(5) The raw material is waste lye and cheap lime, which can be supplied stably;

(6) The products are in dry state, which can be used comprehensively;

(7) The transformation project can be implemented step by step for each furnace, and the transformation does not affect the normal production of the thermal power plant;

(8) System operation is safe and stable

The main products of Yiqing Environmental Protection include various industrial dust treatment equipment, industrial flue gas desulfurization, denitrification, VOCs treatment equipment and flue gas desulfurization, dust removal, denitrification integrated ultra-low emission equipment, Yiqing Environmental Protection since its inception, based on the industry, social development needs, dedicated to the comprehensive treatment of flue gas, dust and flue gas energy saving and other technical fields of research, technology innovation and upgrading to achieve new breakthroughs. The company has the most cutting-edge integrated flue gas treatment solutions, with strong innovation, development and manufacturing capabilities in the cutting-edge field of environmental protection equipment, with a number of patents for integrated flue gas treatment system, and built a leading flue gas simulation generation and treatment system, the acquisition of advanced monitoring equipment, through accurate generation, accurate monitoring accurately obtain the key nodes and links of the flue gas treatment system The working parameters of each key node and link of the flue gas treatment system have been accurately generated and monitored, and the cause-and-effect relationship between the working parameters of the flue gas treatment link has been mastered, and some unique experience has been gained. The scientific research project "New type of kiln flue gas purification system" undertaken by Yiqing Environmental Protection has been awarded the science and technology projects by Guangdong Province and Foshan Municipal Government.

劲旅环境

Introduction

Working Principle

Technical Features

Advantages