A kind of coal ash slag cooling slag discharge method

Abstract

The invention discloses a coal ash slag cooling and slagging method, which comprises the following steps: (1) primary cooling of cooling air, (2) secondary cooling of steam, (3) third cooling of cooling water, (4) slag discharge tank Slagging and slag discharge. The advantages of the present invention are that carbon dioxide is introduced into the ash pipe instead of steam to control the slag discharge speed, and the ash is cooled once, which reduces the use of steam, reduces the input cost of steam manufacturing equipment and raw coal, and the carbon dioxide After entering the fluidized bed gasifier, it can inhibit the reaction of carbon and oxygen in the fluidized bed gasifier to form carbon dioxide, and promote the reaction of carbon and water vapor; the cooling water at the liquid level in the ash tube continuously evaporates into steam, and the steam The ash is cooled twice, and the steam enters the fluidized bed gasifier through the ash pipe for utilization, which reduces the external steam supply by 5%, and reduces the input cost of steam.

Description

Technical field: [0001] The invention relates to a slag discharge method, in particular to a coal ash slag cooling and slag discharge method. Background technique: [0002] In the fluidized bed gasifier, coal powder and gasification agent undergo gasification reaction to generate crude gas, and coal powder gasifies to produce high-temperature ash. In order to discharge the ash and slag in the fluidized bed gasifier, the slag discharge port of the fluidized bed gasifier is generally connected to the quenching chamber and the slag discharge tank in sequence. The slag discharge process is: inside the fluidized bed gasifier The ash and slag enter the slag discharge channel through the slag discharge port, and steam is passed into the slag discharge channel to control the slag discharge speed. At the same time, cooling water is passed into the slag discharge channel to cool the ash during the descent process. The slag discharge channel falls into the quenching chamber together, ...

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Problems solved by technology

[0003] The above-mentioned slag discharge device has the following problems during use: 1. The ash needs to be cooled in the quenching chamber for a period of time, and the slag is continuously fed into the quenching chamber. The pump is forced to circulate, and the cooling water will contain some ash, which will cause blockage of the circulating pump and heat exchanger during the circulating cooling process, which will interrupt the work of the slag discharge device and affect the slag discharge efficiency; 2. Ash in the slag discharge tank Falling into the slag storage device by its own weight, the slag storage device can only be placed under the slag discharge tank, the location of the equipment is limited, the overall height of the slag discharge equipment is high, and it is not easy to repair and maintain; 3. Steam is introduced into the slag discharge channel Controlling the speed of slag discharge increases the amount of steam used, and steam needs to be produced by steam boilers, which increases the input cost of equipment and raw coal; 4. Pass cooling water into the slag discharge channel to cool the ash, and the slag cannot be completely submerged Cooling water, poor cooling effect

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