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Low temperature pyrolysis method for low-rank coal with small particle size

A low-temperature pyrolysis, low-rank coal technology, applied in the field of coal chemical industry, can solve the problems of difficult separation of fine coal powder and coal tar mixture, no industrial application performance, easy to block equipment pipelines, etc., so as to improve the comprehensive efficiency of enterprises and market competition. power, reducing the amount of pyrolysis wastewater, and the effect of high yield

Inactive Publication Date: 2017-11-28
王彩虹 +3
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Problems solved by technology

However, due to the difficulty of separating the mixture of fine coal and coal tar, and the easy blockage of equipment and pipelines, the engineering problems of pulverized coal pyrolysis have not been effectively broken through. In the initial stage, there is no mature industrial application performance, and there are still many engineering problems to be solved

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  • Low temperature pyrolysis method for low-rank coal with small particle size
  • Low temperature pyrolysis method for low-rank coal with small particle size
  • Low temperature pyrolysis method for low-rank coal with small particle size

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Embodiment Construction

[0027] Such as Figure 1-Figure 3 As shown, a kind of low-rank pulverized coal low-temperature pyrolysis method provided by the present invention mainly includes the following process steps:

[0028] Step 1. Firstly, the raw coal is fed into the dryer from the storage bin through the elevator for preheating and drying. Specifically, the raw coal is transported from the coal storage yard to the storage bin through the belt, and then sent into the drying tower through the bucket elevator. In the drying tower, the pulverized coal moves from top to bottom relying on its own weight, and goes countercurrently with the hot flue gas to exchange heat directly. When the temperature rises to 120°C and the moisture drops below 0.5%, the drying process is completed and discharged from the outlet at the bottom of the tower. The hot flue gas discharged from the pyrolysis furnace is introduced into the bottom of the drying tower through the flue. Under the action of the bottom of the tower a...

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Abstract

The invention relates to a low temperature pyrolysis method for low-rank coal with small particle size. The low temperature pyrolysis method comprises the following steps: adding raw coal into a drying tower from a warehouse by virtue of an elevator, and carrying out preheating and drying; putting the dried raw coal into a buffer coal bin to be stored by virtue of the elevator, and continuously feeding into a distributed high-thermal-conductivity pyrolysis device to realize low temperature pyrolysis (at the temperature of 500-650 DEG C); after pyrolysis, feeding high-temperature coke powder into a coke quenching device, cooling by virtue of coke quenching steam and coke quenching water, and then discharging out under the control of a discharging valve; realizing oil-dust separation on raw coal gas produced during pyrolysis by carrying out dynamic material layer and high temperature secondary dust removal; directly spraying circulating ammonia water to the raw coal gas after the dust removal in a cooling tower for cooling, primarily separating coal tar in the raw coal gas, and then carrying out secondary tar removal on the coal gas by virtue of an electrical tar precipitator; and sending out the purified coal gas by virtue of an induced draft fan to be returned back to a furnace or taken as fuel gas. The low temperature pyrolysis method provided by the invention can solve the problem of realizing oil-dust separation during low temperature pyrolysis and phyrolysis by utilizing coal with the small particle size and has the advantages of high fine powder removal rate, high environmental protection performance and high pyrolysis efficiency.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a low-temperature pyrolysis method for low-rank coal with a small particle size (0-30mm). Background technique [0002] my country is rich in low-rank coal resources and has huge reserves. With the improvement of fully mechanized mining rate, the proportion of small particle size coal is getting heavier and heavier. Low-rank coal can be pyrolyzed to obtain clean oil products, chemicals, synthetic natural gas and other high value-added products, which is the main technical path for comprehensive utilization of coal. However, due to the difficulty of separating the mixture of fine coal and coal tar, and the easy blockage of equipment and pipelines, the engineering problems of pulverized coal pyrolysis have not been effectively broken through. In the initial stage, there is no mature industrial application performance yet, and there are still many engineering problem...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B57/10C10B57/14C10B47/18C10K1/02C10K1/12C10K1/00
CPCC10B53/04C10B47/18C10B57/10C10B57/14C10K1/00C10K1/02C10K1/121
Inventor 周建明许德平张永发王彩虹
Owner 王彩虹
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