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

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

Active Publication Date: 2015-03-25
武汉光谷环保科技股份有限公司
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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

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

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Effect test

Embodiment 1

[0031] Using a glass kettle reactor (inner diameter 100 mm, height 200 mm), firstly carry out the limestone slurry activation test, that is, add 300 mL of distilled water and 10 g of analytically pure CaCO3 solid powder into the reactor, and then continuously feed 30 mL of CO2 gas into the reactor and stir 3 hours, made CaCO3 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; CO2 gas is provided by cylinder gas, and the flow rate is controlled by a mass flow meter. After the activation is completed, take out the CaCO3 slurry sample, filter the CaCO3 solute that may be brought out through the filter paper and the funnel, and make a saturated aqueous solution; then weigh it with a ten-thousandth electronic balance, and use the liquid evaporation method to obtain the solute CaCO3, after calculation Get the solubility of C...

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, cylinder gas (O2, CO2 and SO2) was used as the gas source, the total flow rate was 2m3 / h, the flue gas composition was O2: 0.4m3 / h, CO2: 1.6m3 / h, and the volume concentration of SO2 was 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 SO2 gas in countercurrent contact with the flue gas. The flow rate of the water pump is stabilized to 150L / h by adjusting the valve, and the slurry t...

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 particle size of limestone is ≤63μm (90% passes through 250 mesh). 1160kg / m3, the pH value of the slurry is between 5.2 and 5.6, and the Ca / S ratio is 1.03. The SO2 concentration in the inlet flue gas is 1800-2000mg / m3, and the SO2 concentration in the outlet flue gas is 80-90mg / m3. When the desulfurization system is running, the three slurry circulation pumps operate for a long time, the liquid-gas ratio is about 14.8L / m3, and the desulfurization efficiency is about 95.2-95.7%. The gas ratio drops to 9.8L / m3, and the desulfurization efficiency drops to 90.3-90.8%.

[0037]...

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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 number of pollutants such as CO2 and SO2 emitted by coal burning 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, as a new coal combustion technology that can effectively control CO2 emissions and reduce the precipi...

Claims

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Application Information

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Patent Type & Authority Applications(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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