Method for producing semi-coke by carbonizing lump coal through vertical circular furnace

Abstract

The invention discloses a method for producing semi-coke by carbonizing lump coal through a vertical circular furnace. The method comprises the following steps: raw coal is sieved into the lump coal and fine coal; the lump coal enters a charged coal sealing device of the vertical circular furnace; coal dust is centrally collected and treated; the lump coal at a drying section of the furnace body makes contact with high-temperature raw coke oven gas generated by the carbonizing the lump coal at a carbonization section of a furnace body, so that water in the lump coal is removed; dried and dehydrated lump coal enters the carbonization section; coal gas and air are mixed and then are combusted in a hot air furnace to generate high-temperature flue gas; two-section heat is provided for the carbonization section of the furnace body so as to carbonize the lump coal, and further the semi-coke and the raw coke oven gas are generated; the raw coke oven gas passes through the drying section andwater in the lump coal is taken away for educing; the semi-coke enters a waste heat recycling device, and generated steam is subjected to waste heat power generation or is supplied to a steam using device in a factory; the semi-coke is quenched to obtain a finished semi-coke product; the raw coke oven gas is sprayed, washed and cooled and then enters a tar and coal gas separating and purifying device for separating and purifying to obtain finished products of tar and coal gas. The method disclosed by the invention has the advantages of safe and stable technological process, energy conservation, environmental protection and high resources utilization ratio.

Description

technical field [0001] The present invention relates to a new process and technology for industrialized block coalization to produce semi-coke, in particular to an industrialized process technology and equipment for producing semi-coke from block coal by using a vertical circular furnace, which belongs to the technical field of coal chemical industry. Background technique [0002] Semi-coke, also known as semi-coke, is a solid substance produced from Jurassic coal by medium and low temperature carbonization process. It has high fixed carbon, high specific resistance, high chemical activity, low ash content, low aluminum, low sulfur, Low in phosphorus, it is widely used in the production of calcium carbide, ferroalloy, ferrosilicon, silicon carbide, chemical industry, smelting, gas production and other industries, and can also be used as a clean fuel for industry and civil use. According to the final heating temperature, it can be divided into low-temperature carbonization (5...

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Problems solved by technology

[0004] The defect of the above-mentioned method is: raw coal is added into the carbonization furnace from the coal storage box on the top of the upright square box furnace, and the coal storage box is a single valve structure. ~500Pa), raw gas and coal dust will leak from the coal inlet in large quantities, polluting the environment, and at the same time there will be a risk of fire or explosion, affecting safe production

The carbonization heat supply method is to send gas and air into the combustion chamber of the furnace body at the same time, and the gas mixed combustion directly supplies heat to the carbonization section, which is likely to cause the overburning of the semi-coke near the combustion chamber and the intermingling of the semi-coke far away from the combustion chamber. As a result, the quality of semi-coke products is unstable and the oil yield of tar is reduced. The heavy oil content in tar is relatively high, which reduces the economic value of semi-coke and tar.

Semi-coke is quenched by water immersion, resulting in high water consumption and high moisture content of semi-coke products, which is not conducive to the use of semi-coke as industrial raw materials, and reheating and drying causes energy waste; semi-coke is directly immersed in water to quench coke. The heat energy utilization of high-temperature semi-coke is equal to the direct discharge of heat into the atmosphere, causing environmental pollution; the semi-coke product contains a certain amount of ammonia water in the water-immersed coke quenching, so that the semi-coke cannot be used as a clean fuel

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