5 results about "Coal gasification" patented technology

Treated water with good water quality which can be discharged or reused is obtained by efficiently removing SS, fluorine, cyanogen, selenium, ammonia, and COD components contained in coal gasification wastewater such as gas washing wastewater generated in a coal gasification step. A method of treating coal gasification wastewater comprising steps (1) to (4), wherein the step (1) is performed prior to the step (2): (1) a fluorine removal step in which fluorine is removed by coagulation sedimentation; (2) a cyanogen decomposition step in which cyanogen is decomposed by wet oxidation or thermal hydrolysis; (3) a selenium treatment step in which selenate ions are subjected to a reduction treatment with a metal reductant; and (4) a COD/ammonia removal step in which COD and/or ammonia are/is removed.

The invention discloses an artificial stone and a preparation method thereof. The method comprises the following steps: performing gasification reaction on a first coal material and a first gasifying agent in a gasifying unit to obtain molten-state residue liquid and raw gas; directly casting the molten-state residue liquid discharged from the gasifying unit into the artificial stone. By the method, coal residue generated by coal gasification is subjected to waste utilization to produce the artificial stone, the coal residual content of the raw gas is reduced, and the pressure of subsequent gas purification is reduced.

The invention relates to a gasification furnace with radiation heat exchange and a gasification method. The gasification furnace includes a shell and a furnace body. The furnace body includes a gasification chamber, a radiation heat exchange chamber and a shock chamber which are arranged coaxially in sequence from top to bottom. A burner connection port is formed in the top of the gasification chamber, raw coal and pure oxygen are sprayed into the gasification chamber through a burner to perform a coal gasification reaction, crude synthesis gas and molten ash after the reaction swirl down to enter a slag discharging port. Constrained by the special swirling structure of the slag discharging port, the gas flow and molten ash entering the radiation heat exchange chamber still maintain a swirling manifold, the following performance of the ash and gas flow in the crude synthesis gas is maintained, the collision between the ash and between the ash and the inner wall of a radiation heat exchanger is reduced, and the probability of random diffusion of the ash to the inner wall surface of the radiation heat exchange chamber is greatly reduced. Meanwhile, a heat exchange screen on the innerwall surface of the radiation heat exchanger is deflected by a certain angle in the direction of swirling flow, not only the slag passing diameter is increased, but also the disturbance of the inneredge of the heat exchange screen on the gas flow is reduced, so that the risks of slag bonding and ash deposition are structurally reduced.

The invention discloses a gas liquor purification treatment system after coal gasification. The system comprises a gas liquor main, which is connected to a cold source inlet of a third heat exchanger.The cold source outlet of the third heat exchanger is connected to a feed inlet of a stripping tower through a decompression separation unit, which is also connected to a tar connecting unit. The decompression separation unit is used for removing tar in the gas liquor. The stripping tower is used for removing impurity components in the gas liquor. A gas liquor outlet of the stripping tower is connected to a hot source inlet of the third heat exchanger through a pipeline. The third heat exchanger is used for preheating low-temperature gas liquor of the gas liquor main through high-temperaturegas liquor at the outlet of the stripping tower. A hot source outlet of the third heat exchanger is connected to a sewage treatment tank through a fourth heat exchanger. By the system, contents of COD, ammonia and henol in the gas liquor are effectively reduced, and the energy consumption of the subsequent water treatment is greatly reduced, the gas liquor is reused, and consumption of industrialwater during the production process is lowered.