A cross-flow coal blending pyrolysis method and pyrolysis device

A technology of pyrolysis and coal blending, which is applied in the field of coal chemical industry, can solve the problems of uneven gas-solid heat transfer, easy blockage of equipment pipelines, and low processing capacity of a single furnace, so as to improve product quality, compact structure, and small footprint Effect

Active Publication Date: 2021-12-07
BEIJING GUODIAN FUTONG SCI & TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing internal heating moving bed pyrolysis technology treats mixed coal with a diameter of less than 30mm, uneven gas-solid heat transfer is common, low heat utilization efficiency, high dust content in gas, difficult purification treatment, easy blockage of equipment and pipelines, and poor product quality and other problems; due to the obvious temperature gradient in the furnace of the external heating pyrolysis process, the processing capacity of a single furnace is low, and it is difficult to apply industrially; the materials in the fluidized bed or rotary furnace pyrolysis device are violently disturbed, and the amount of gas dust is large. Pyrolysis gas containing dust and oil is precipitated in a high-temperature form (>400°C), the processing flow is complicated, the system stability is poor, and the operating cost is high

Method used

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  • A cross-flow coal blending pyrolysis method and pyrolysis device
  • A cross-flow coal blending pyrolysis method and pyrolysis device
  • A cross-flow coal blending pyrolysis method and pyrolysis device

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Embodiment 1

[0039] This embodiment takes long-flame coal pyrolysis as an example, as figure 1 As shown, the raw material can be directly fed into the furnace through the conveyor belt, and exchange heat with the hot flue gas in the drying section. The external water is completely removed, and the temperature of the material rises to about 200°C. Under the action of gravity, the material enters the dry distillation section and exchanges heat with 850°C gas. In order to reduce the resistance of the gas passing through the material and increase the gas residence time, the high-temperature gas is introduced into the furnace through a multi-layer air intake structure. The temperature of the material is gradually increased to 600°C and a pyrolysis reaction occurs, and the volatile matter is precipitated in the form of a gas. Then it is assembled by the multi-layer gas-collecting structure in the furnace and then exported to the outside of the furnace. The temperature of the gas outlet is about ...

Embodiment 2

[0042] A kind of cross-flow mixed coal pyrolysis device described in this embodiment, such as Figure 2-7 As shown, it includes a vertical pyrolysis furnace body, and the interior of the vertical pyrolysis furnace body 1 includes a drying unit, a first transition section 8, a pyrolysis unit 1, a second transition section and a cooling unit arranged in sequence from top to bottom , the middle position of the pyrolysis unit is provided with a multilayer gas distribution structure, and the multilayer gas distribution structure includes a vertically arranged gas distribution chamber 2 and a plurality of laterally arranged gas distribution branch pipes 3, the gas distribution The chamber is provided with an air inlet 6, and each of the air distribution branch pipes communicates with the air distribution chamber, and the air distribution branch pipes 3 are evenly arranged on the left and right sides of the air distribution chamber 2, and the air distribution branch pipes on each side...

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Abstract

The invention discloses a cross-flow mixed coal pyrolysis method and a pyrolysis device, adopting a longitudinal multi-layer gas distribution and multi-layer gas collection structure, combining gas-solid two-phase cross-flow and counter-flow, and realizing uniform heat exchange and primary dust reduction at the same time , for the dusty and oily high-temperature gas produced by pyrolysis, make it contact with the medium-temperature material in the dry distillation transition section for heat exchange to achieve the purpose of secondary dust removal, and condense a part of the heavy tar, which is brought into the dry distillation section by dry coal for secondary Secondary pyrolysis, the gas precipitated by the pyrolysis device has the characteristics of moderate temperature, low dust content and high light oil content, which significantly reduces the workload and equipment investment of the gas purification system, and improves the quality of gas and tar products.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and in particular relates to a cross-flow type mixed coal pyrolysis method and a pyrolysis device. Background technique [0002] Coal pyrolysis refers to placing coal in an isolated air or inert gas environment, and after continuous heating to a certain temperature, a series of physical and chemical changes occur to obtain coal gas (gaseous), coal tar (liquid) and semi-coke ( Solid) thermal processing technology. Pyrolysis is an important link in the thermal processing of coal, and has attracted widespread attention due to its advantages such as low processing temperature, simple process and operation. According to the properties and structural differences of pyrolysis products, differential processing is carried out, and the industrial chain is extended to produce a variety of chemical raw materials and various fine chemicals, so as to realize the clean and efficient utilization of coal. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B57/10C10B53/00C10B49/02C10G1/00
CPCC10B49/02C10B53/00C10B57/10C10G1/00
Inventor 吴鹏苗文华王兴坤戴航张旭辉沈丹丹王森
Owner BEIJING GUODIAN FUTONG SCI & TECH DEV
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