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A method for strengthening the activity of limestone-gypsum wet flue gas desulfurization slurry

A technology of wet flue gas desulfurization and limestone slurry, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of inability to guarantee the quality of desulfurization by-products, complicated types of additives, and large application randomness. Solve the effects of rising SO2 concentration, flexible load adjustment, and simple technical transformation

Active Publication Date: 2017-02-15
武汉光谷环保科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of adding additives to the desulfurization system is mostly used to achieve the purpose of strengthening the desulfurization effect. Although these additives have activated the limestone desulfurizer to a certain extent, the types of additives are currently complicated and the application is random. There is no reliable evaluation plan for additive selection, and there are great potential safety hazards; and because power plants have strict requirements on the use of chemicals, the existing additives cannot produce good effects on the entire process and ensure the quality of desulfurization by-products, and their applicability is relatively low. Difference

Method used

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  • A method for strengthening the activity of limestone-gypsum wet flue gas desulfurization slurry
  • A method for strengthening the activity of limestone-gypsum wet flue gas desulfurization slurry
  • A method for strengthening the activity of limestone-gypsum wet flue gas desulfurization slurry

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Embodiment 1

[0031] Using a glass tank reactor (inner diameter 100 mm, height 200 mm), the limestone slurry activation test was first carried out, that is, 300 mL of distilled water and 10 g of analytically pure CaCO 3 The solid powder was added to the reactor, and then 30 mL of CO was continuously introduced into the reactor. 2 gas and stir for 3 hours to make CaCO 3 solution. The temperature of the reactor is controlled by a horizontal temperature water bath, and the activation temperature is 20-60°C; the pH value is monitored in real time by a Starter300 portable pH meter; CO 2 The gas is provided by cylinder gas, and the flow rate is controlled by a mass flow meter. Remove CaCO after activation is complete 3 Slurry sample, filtered through filter paper and funnel to remove possible CaCO 3 Solute, made into a saturated aqueous solution; then weighed with a ten-thousandth electronic balance, and the solute CaCO was obtained by liquid evaporation method 3 , after calculating CaCO 3 so...

Embodiment 2

[0034] The continuous reaction test of limestone-gypsum wet flue gas desulfurization was carried out on the laboratory desulfurization system. The absorption tower is a circular reactor made of plexiglass, with a height of 1.5m and an outer diameter of 0.05m. During the test, the cylinder gas (O 2 , CO 2 and SO 2 ) as the air source, the total flow rate is 2m 3 / h, the composition of flue gas is O 2 : 0.4m 3 / h, CO 2 : 1.6m 3 / h,SO 2 The volume concentration is about 1000ppm. The simulated flue gas is firstly mixed evenly by the gas mixer and the preheater and heated to 120°C, and then flows through the absorption tower from the bottom up through the flue gas inlet; and the limestone slurry with a concentration of 5% is composed of limestone with a particle size of 20-63 μm It is sprayed from the top nozzle by the pump, and absorbs SO in countercurrent contact with the flue gas 2 gas. The flow rate of the water pump is stabilized to 150L / h by adjusting the valve, an...

Embodiment 3

[0036] The 2×350WM unit of a power plant adopts the limestone-gypsum wet-process full flue gas desulfurization process, one furnace and one tower desulfurization device, and a common set of desulfurization absorption preparation and gypsum slurry dehydration systems. The sulfur content of the designed coal is 0.6-1.2%. The limestone wet ball mill pulping system is used in the desulfurization process, the limestone particle size is ≤63μm (90% passes through 250 mesh), and the slurry density of the limestone slurry tank is about 1300-1350kg / m 3 , while the density of limestone slurry in the absorption tower is controlled at 1120-1160kg / m 3 , the pH value of the slurry is between 5.2 and 5.6, and the Ca / S ratio is 1.03. SO in the inlet flue gas 2 The concentration is 1800~2000mg / m 3 , SO in the outlet flue gas 2 The concentration is 80~90mg / m 3 . When the desulfurization system is running, three slurry circulation pumps run for a long time, and the liquid-gas ratio is about...

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Abstract

The invention relates to a method for strengthening the activity of limestone-gypsum wet-method flue gas desulfurization slurry, and belongs to the technical field of flue gas desulfurization processes. An activation pipe network is arranged at the bottom of a limestone slurry box; a rear smoke channel of an oxygen-enriched combustion boil system feeds a part of system-captured high-concentration CO2 gas into the activation pipe network to activate the desulfurization slurry in the limestone slurry box; the activated limestone slurry is fed into an absorption tower and is subjected to countercurrent contact and absorption with the SO2 gas; activated and leaked CO2 gas returns to the rear smoke channel of the oxygen-enriched combustion boil system through a CO2 gas overflow opening at the top of the limestone slurry box. The method for strengthening the activity of the limestone-gypsum wet-method flue gas desulfurization slurry improves the reaction efficiency of CaCO3 and the SO2 by facilitating the dissolution of CaCO3 and the SO2.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization technology, and in particular relates to a method for enhancing the activity of limestone-gypsum wet flue gas desulfurization slurry. Background technique [0002] In today's era, the air pollution caused by coal burning has become an important environmental problem in the world, especially in my country, where coal consumption accounts for 70% of energy consumption, and is in an absolute dominant position. A large amount of CO emitted by coal burning 2 and SO 2 Pollutants such as pollutants are always threatening the safety of the environment and human health. Energy and the environment have become an inevitable problem in the process of social development in our country. Therefore, many clean coal utilization technologies have been proposed, among which oxygen-enriched combustion technology can effectively control CO 2 emissions while reducing SO 2 The new coal combustion te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 田路泞陈汉平赵清华刘斌
Owner 武汉光谷环保科技股份有限公司
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