Utilization method and system for tail gas of calcium carbide furnace

A calcium carbide furnace tail gas and limestone technology, which is applied in furnaces, furnace components, waste heat treatment, etc., can solve the problems of prone to spontaneous combustion, hidden dangers, and easily broken blue carbon, so as to eliminate hidden dangers, save investment, and reduce energy consumption. Effect

Inactive Publication Date: 2012-08-01
NANJING SUYE CALCIUM IND TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This drying method has the following disadvantages: the semi-coke is easily broken and has a high breakage rate, which is not conducive to the production of calcium carbide; due to the high oxygen content in the air drying the semi-coke, the semi-coke is prone to spontaneous combustion during the drying process, which has certain safety hazards

Method used

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  • Utilization method and system for tail gas of calcium carbide furnace
  • Utilization method and system for tail gas of calcium carbide furnace
  • Utilization method and system for tail gas of calcium carbide furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0031] see Figure 1-4 The comprehensive utilization system of calcium carbide furnace tail gas and lime rotary kiln tail gas shown.

[0032] Burner 4 is a dual-fuel four-channel burner that can burn calcium carbide furnace gas and pulverized coal at the same time. It is a concentric sleeve composed of 4 steel pipes with different diameters. From the cross-sectional shape of the concentric sleeve, it is composed of Four concentric channels 41-44 are formed from inside to outside. The concentric channel 43 is connected with the outlet of the gas pressurized blower 3 as a gas pipe for transporting calcium carbide furnace gas. The concentric channel 41 (burner inner tube) is connected to the outlet of the coal air duct 34 as a coal air channel (auxiliary fuel pipe) for conveying pulverized coal and air. The concentric channel 44 and the concentric channel 42 serve as combustion-supporting air ducts for transporting air and are connected to the tube-side outlet of the heat excha...

Embodiment 2

[0041] see Figure 5 , 6 , 8 (and refer to image 3 , 4 , 7) The comprehensive utilization system of calcium carbide furnace exhaust gas and lime rotary kiln exhaust gas.

[0042] The difference between embodiment 2 and embodiment 1 is: see Figure 5 , 8 , it has one more pulverized coal burner 29 than embodiment 1; Certainly, its burner 4 is less than the burner 4 in embodiment 1 a concentric channel 41. Pulverized coal burner 29 links to each other with the outlet of coal air duct 34.

[0043] The specific working process of the comprehensive utilization system of this technology: pressurize the calcium carbide furnace tail gas that has been cooled by heat exchange with air, and send it to the burner of the lime rotary kiln for combustion, and use the air that has been heated by heat exchange to support combustion; The kiln exhaust gas is introduced into the vertical dryer and directly contacts the semi-coke in the vertical dryer to dry the semi-coke; the gas discharge...

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Abstract

The invention provides a utilization system for the tail gas of a calcium carbide furnace. By the system, without purification treatment, the tail gas of the calcium carbide furnace is directly conveyed into a burner and then burnt, investment to the purification treatment of the tail gas of the calcium carbide furnace is eliminated, and hidden danger in the purification treatment of the tail gas of the calcium carbide furnace, which contains high-concentration carbon oxide (CO), is eliminated. The utilization system for the tail gas of the calcium carbide furnace comprises a heat exchanger, a pressurizing conveying fan and a lime rotary kiln, wherein the heat exchanger cools the tail gas of the calcium carbide furnace; the lime rotary kiln is provided with the burner; and a calcium carbide furnace tail gas discharge pipe, the heat exchanger, the pressurizing conveying fan and the burner are sequentially connected in series. The invention also provides a utilization method for the tail gas of the calcium carbide furnace. The method comprises the following steps of: reducing the temperature of the tail gas of the calcium carbide furnace to 200 to 400 DEG C; pressurizing the tail gas of the calcium carbide furnace to be over 3,000 Pa by using the pressurizing conveying fan; conveying the tail gas of the calcium carbide furnace into the burner of the lime rotary kiln; and burning the tail gas of the calcium carbide furnace.

Description

technical field [0001] The technology relates to a method and system for utilizing calcium carbide furnace tail gas, in particular to a method and system for comprehensively utilizing calcium carbide furnace tail gas and lime rotary kiln tail gas. Background technique [0002] Calcium carbide furnace raw gas (unpurified calcium carbide furnace tail gas) is the tail gas produced in the process of calcium carbide furnace production. There are more than 400 calcium carbide furnaces in China's calcium carbide industry, and the number is still increasing every year. The annual output ranks first in the world. However, the thermal energy utilization and purification of the calcium carbide furnace tail gas have always been a major problem, and extremely serious pollution has always plagued our country. The healthy development of calcium carbide industry. Due to the special nature of the dust in the tail gas of calcium carbide furnace, the dust particles are fine, the specific surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
Inventor 刘银江杭宁刘宇
Owner NANJING SUYE CALCIUM IND TECH
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