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Low-rank coal low-temperature dry distillation pyrolysis process

A low-rank coal and dry distillation technology, applied in the field of coal dry distillation, can solve the problems of high energy consumption, waste of resources, and high pollution emissions, and achieve the effects of reducing environmental pollution and solving dust entrainment

Active Publication Date: 2014-03-26
辽宁东大粉体工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a low-temperature dry distillation pyrolysis process for low-rank coal, which uses a modified multi-stage furnace As a low-temperature dry distillation equipment, the gas gas after pyrolysis and oil extraction of low-rank coal materials is used as a circulating heat carrier to dry and preheat low-rank coal, dry distillation and pyrolysis, extract tar and produce semi-coke, so as to realize the low-rank coal. Scientific and rational comprehensive application of resources

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  • Low-rank coal low-temperature dry distillation pyrolysis process

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Embodiment 1

[0029] Combine below figure 1 The present invention will be further described.

[0030] A low-temperature dry distillation pyrolysis process for lignite, comprising the following steps:

[0031] 1. The lignite is dried, crushed and sieved, and the undersized material with a particle size of ≤50 mm and a water content of 30.1% is selected, and sent to the upper hopper of the vertical, multi-layer retort furnace, and enters the drying section through the feeder and the feeding pipe. Under the thrust of the rake teeth in the furnace, it is evenly pushed and turned on each furnace level, and moves down layer by layer, and is combined with the hot oil, gas and gas produced by pyrolysis in the dry distillation section, which passes through the furnace layer of the preheating section and rises to the drying section. The gas is in countercurrent mixed flow contact to complete the drying and dehydration process;

[0032] 2. The dried lignite material enters the preheating section thr...

Embodiment 2

[0038] A low-temperature dry distillation pyrolysis process for lignite, comprising the following steps:

[0039]1. The lignite is dried, crushed and sieved, and the underscreen material with a particle size of ≤50mm and a water content of 18.9% is selected and sent to the hopper above the vertical and multi-layer retort furnace, and enters the drying section through the feeder and the feeding pipeline. Under the thrust of the rake teeth in the furnace, it is evenly pushed and turned on each furnace level, and moves down layer by layer, and is combined with the hot oil, gas and gas produced by pyrolysis in the dry distillation section, which passes through the furnace layer of the preheating section and rises to the drying section. The gas is in countercurrent mixed flow contact to complete the drying and dehydration process;

[0040] 2. The dried lignite material enters the preheating section through the drying section. Under the action of the rake teeth thrust in the furnace...

Embodiment 3

[0046] A long-flame coal low-temperature dry distillation pyrolysis process, comprising the following steps:

[0047] 1. The long-flame coal is dried, crushed and sieved, and the underscreen material with a particle size of ≤50 mm and a water content of 27.6% is selected and sent to the upper hopper of the vertical and multi-layer retort furnace, and enters the drying section through the feeder and the feeding pipeline. Under the thrust of the rake teeth in the furnace, the material is evenly pushed and turned on each furnace level, and moves down layer by layer, and is combined with the heat generated by pyrolysis in the dry distillation section, which passes through the furnace layer of the preheating section and rises to the drying section. The oil, gas and gas are contacted in countercurrent and mixed flow to complete the drying and dehydration process;

[0048] 2. The dry long-flame coal material enters the preheating section through the drying section. Under the thrust o...

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Abstract

The invention provides a low-rank coal low-temperature dry distillation pyrolysis process at the aim of existing problems of resource waste, high energy consumption and a large amount of pollution discharge of low-rank coal including lignite and the like. The process adopts an improved multistage furnace as carbonization equipment, gas obtained from low-rank coal material subjected to pyrolysis and oil extraction as a circular heat carrier, and the low-rank coal is subjected to drying, preheating, carbonization, pyrolysis, tar extraction and semicoke production. According to the process, the low-rank coal including the lignite is conveyed to a multistage furnace via a hopper above the multistage furnace, under the pushing action of the harrow teeth in the multistage furnace, the material is uniformly pushed and turned on a furnace layer surface, and is lowered from a drying section, a preheating section, a carbonization section and a cooling section in sequence; via the drying, preheating, dry distillation pyrolysis, thermal oil gas and semicoke are obtained; the thermal oil gas upwards flows through the preheating section, the drying section and a diffuse section and then is exhausted out of the multistage furnace, tar and gas are obtained via extraction, and the gas is reused as a heat carrier. As a result, the scientific and comprehensive application of the low-rank coal is achieved.

Description

technical field [0001] The invention relates to the technical field of coal dry distillation, in particular to a low-rank coal dry distillation production process. Background technique [0002] Low-rank coal refers to coal in the low metamorphic stage, which has the characteristics of low ash, low sulfur, high volatile matter, and strong activity. The main coal types are lignite and low metamorphic bituminous coal. Among them, lignite is a coal with relatively low degree of metamorphism and many special properties. [0003] my country has relatively large reserves of low-rank coal, accounting for 55% of all coal reserves, of which lignite accounts for about 14%. At present, 90% of these coals are directly burned as fuel. However, because low-rank coal has high total water and internal water content, high hydrogen and oxygen content, easy spontaneous combustion, and low calorific value, it is a waste of resources to burn under the same conditions without considering the diff...

Claims

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Application Information

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IPC IPC(8): C10B53/04C10B57/14C10B49/04
Inventor 张继宇
Owner 辽宁东大粉体工程技术有限公司
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