CN102188863B - Process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process - Google Patents
Process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process Download PDFInfo
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- CN102188863B CN102188863B CN2010101206287A CN201010120628A CN102188863B CN 102188863 B CN102188863 B CN 102188863B CN 2010101206287 A CN2010101206287 A CN 2010101206287A CN 201010120628 A CN201010120628 A CN 201010120628A CN 102188863 B CN102188863 B CN 102188863B
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Abstract
The invention relates to a process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process. The process comprises the following steps of: sucking high-dew-point and low-oxygen-content dust-containing dried tail gas which is exhausted from the tail of a drier into a bag-type dust remover by a draught fan for gas-solid separation; discharging separated dust which is deposited at the bottom of the bag-type dust remover by a star discharger; drawing purified carrier gas and water vapour to a safety place by the draught fan for exhausting; drawing a part of the tail gas from an outlet pipeline of the bag-type dust remover by a circulating fan; mixing a part of air which is heated by an air heater; and heating the air by using a circulating heater, and mixing into an outlet tail gas pipeline of the drier. The aim of preventing the fogging of the tail gas in the dried tail gas treatment process is fulfilled by cyclically heating the part of the tail gas and mixing a certain amount of hot air, the aim of preventing the explosion is fulfilled by controlling the content of oxygen in an outlet of the bag-type dust remover, and the fogging of the dried tail gas in the bag-type dust remover is prevented during explosion prevention.
Description
Technical field
Patent of the present invention relates to coal dried tail gas processing technology field, belongs to the anti-condensation blast protection technique of a kind of coal dried tail gas in the dry-method bag-type dust removal process.This technique is applicable to the processing that produces tail gas in the heat-conduction-type drying machine dry run of the dry adverse current of coal or following current indirect, also be applicable to brown coal, the processing that produces tail gas in dry run when also can be used for long bituminous coal, coking coal and other inflammable, explosive material and adopting the heat-conduction-type drying machine of indirect.
Background technology
Coal occupies irreplaceable status in China's energy-consuming.The efficient utilization of brown coal is subject to the great attention of energy circle.Therefore reduce moisture, improve energy density and just become one of key issue of brown coal processing and utilization.Studies show that, after moisture is high, that calorific value is low brown coal dehydration upgrading is processed, can significantly reduce Coal ' moisture, improve caloric value, increase the product applicability, prevent spontaneous combustionof coal.After brown coal upgrading processing, its composition and character level off to bituminous coal, and be convenient to transportation after moulding and store, be beneficial to the multiple uses such as generating, gas making, chemical industry, become high value added product, to building a resource-conserving society, guarantee the sustainable development of national economy, have important theoretical and practical significance.
The heat-conduction-type of conventional indirect is dry, all needing to replenish a certain amount of carrier gas in drying machine takes the steam that evaporates in drying machine out of, carrier gas employing inert gas such as nitrogen, carbon dioxide can increase the operating cost of device, adopt air to have as the carrier gas characteristic inflammable, explosive because coal dust has the danger that fires.All strictly control the inlet of air when therefore the dry employing of coal air is as carrier gas, prevent that coal dust from firing, this has just caused the drying machine tail gas dew point high, and easily in vent gas treatment part dewfall, impact is operation continuously.
Summary of the invention
Drawback in view of above-mentioned prior art exists the present invention proposes the anti-condensation blast protection technique of a kind of coal dried tail gas in the dry-method bag-type dust removal process.By the partial tail gas circulating-heating and mix the purpose that a certain amount of hot-air reaches tail gas anti-condensation in the dried tail gas processing procedure, reach explosion-proof purpose by controlling sack cleaner outlet oxygen content.
Purpose of the present invention can be achieved through the following technical solutions:
The anti-condensation blast protection technique of a kind of coal dried tail gas in the dry-method bag-type dust removal process, it is characterized in that: carried out gas solid separation by induced draft blower withdraws from the high dew point of drying machine discharge, the dust-containing tail gas of low oxygen content in sack cleaner, the dust deposit that separates draws off through star-like discharger to the bag-type dusting filter bottom, and the carrier gas after purification, water vapour cause the safety place discharging through air-introduced machine; Circulating fan is drawn a part of tail gas from the sack cleaner outlet conduit, after mixing the air after part heats with air heater, then with sneaking into drying machine outlet exhaust pipe after the recirculation heater heating.
Adopt the beneficial effect of advantage of the present invention and generation to be:
Blast protection, the anti-condensation method of a kind of dry-method bag-type gas solid separation that is formed by circulating fan, circulating gas heater, air heater, increase circulating fan on the basis of conventional drying sack cleaner technique, make the circulation of tail gas after the part gas solid separation, system provides the tail gas of low oxygen content to replace inert gas to use for gas solid separation, has reduced drying system operating cost; Increase the recycled offgas heating of circulating gas heater self-loopa in the future blower fan, recycle, improve the dried tail gas temperature; Increase air heater, will from mixing with circulating air after the air heat of atmosphere, under guaranteeing that the tail gas oxygen content is less than 12% prerequisite, reduce the tail gas dew-point temperature in the time of explosion-proof.Reach explosion-proof purpose by controlling sack cleaner outlet oxygen content, prevented dried tail gas dewfall in sack cleaner in explosion-proof.
Description of drawings
Fig. 1 is process chart of the present invention.
In figure: the star-like discharger of 1-sack cleaner 2-air-introduced machine 3-circulating fan 4-circulating gas heater 5-air heater 6-
Fig. 2 is process flow diagram of the present invention.
The specific embodiment
By reference to the accompanying drawings, technical solution of the present invention is further described again:
The anti-condensation blast protection technique of a kind of coal dried tail gas in the dry-method bag-type dust removal process, can carry out in the steps below:
As Fig. 1-shown in Figure 2, the tail gas oxygen content of discharging from the drying machine afterbody＜high dew point of 12%, the dust-laden dried tail gas of low oxygen content are drawn into by air-introduced machine 2 and carry out gas solid separation in sack cleaner 1.The dust deposit that separates draws off through star-like discharger 6 to bag-type dusting filter 1 bottom; Carrier gas after purification, water vapour cause the safety place discharging through air-introduced machine 2, because the dried tail gas dew point is higher, for preventing tail gas in discharge duct and the interior dewfall of sack cleaner 1, sack cleaner 1 need to be mixed heat, establishes circulating fan 3, circulating gas heater 4 and air heater 5.Utilize circulating fan 3 to draw a part of tail gas from sack cleaner 1 outlet conduit, make the circulation of tail gas after the part gas solid separation, replace inert gas to use with the tail gas of low oxygen content, reduced drying system operating cost.After mixing the air after part heats with air heater 5, then with sneaking into drying machine outlet exhaust pipe after recirculation heater 4 heating, improve the dried tail gas temperature.For preventing that the interior dust of sack cleaner 1 from firing, enter at dried tail gas and be provided with nitrogen and steam protection device in sack cleaner 1 pipeline.Start nitrogen protection device higher than 12% the time when sack cleaner outlet oxygen content.Start the steam protection device higher than 14% the time when sack cleaner outlet oxygen content.
Claims (1)
1. the anti-condensation blast protection technique of a coal dried tail gas in the dry-method bag-type dust removal process, it is characterized in that: the high dew point of discharging from drying machine, the dust-containing tail gas of low oxygen content are drawn in sack cleaner (1) by air-introduced machine (2) and carry out gas solid separation, the dust deposit that separates draws off through star-like discharger (6) bottom bag-type dusting filter (1), and the carrier gas after purification, water vapour cause the safety place discharging through air-introduced machine (2); Circulating fan (3) is drawn a part of tail gas from sack cleaner (1) outlet conduit, after mixing the air after part heats with air heater (5), then sneaks into drying machine outlet exhaust pipe after using recirculation heater (4) heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101206287A CN102188863B (en) | 2010-03-04 | 2010-03-04 | Process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101206287A CN102188863B (en) | 2010-03-04 | 2010-03-04 | Process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process |
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| Publication Number | Publication Date |
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| CN102188863A CN102188863A (en) | 2011-09-21 |
| CN102188863B true CN102188863B (en) | 2013-05-15 |
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| CN2010101206287A Active CN102188863B (en) | 2010-03-04 | 2010-03-04 | Process for preventing fogging and explosion of coal dried tail gas in dry bag-type dust removal process |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822441A (en) * | 2012-11-16 | 2014-05-28 | 天华化工机械及自动化研究设计院有限公司 | Coal drying method through inert gas circulating |
| CN104179537B (en) * | 2014-08-18 | 2017-01-25 | 北京电力设备总厂有限公司 | Brown coal drying power generating system capable of recycling water in coal and implementation method of brown coal drying power generating system |
| CN109201704A (en) * | 2018-09-27 | 2019-01-15 | 兰州天大华瑞环境工程技术有限公司 | Vacuum drum filters tailings recycling treatment and Zero discharging system and method |
| CN115105908B (en) * | 2022-07-25 | 2023-08-18 | 广东新氧器净化科技有限公司 | Circulating system filters dust remover and filters assembly |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3423517B2 (en) * | 1995-12-27 | 2003-07-07 | 川崎重工業株式会社 | Exhaust gas treatment method and device |
| CN2575571Y (en) * | 2002-11-07 | 2003-09-24 | 广东省新的生物工程研究所有限公司广州生物制品厂 | Vacuum induction smelting furnace |
| CN1888799A (en) * | 2006-07-19 | 2007-01-03 | 山东天力干燥设备有限公司 | Nitrogen circulating coal powder air flow internal heating fluidized bed drying technology |
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2010
- 2010-03-04 CN CN2010101206287A patent/CN102188863B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3423517B2 (en) * | 1995-12-27 | 2003-07-07 | 川崎重工業株式会社 | Exhaust gas treatment method and device |
| CN2575571Y (en) * | 2002-11-07 | 2003-09-24 | 广东省新的生物工程研究所有限公司广州生物制品厂 | Vacuum induction smelting furnace |
| CN1888799A (en) * | 2006-07-19 | 2007-01-03 | 山东天力干燥设备有限公司 | Nitrogen circulating coal powder air flow internal heating fluidized bed drying technology |
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Address after: 730060 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Applicant after: Tianhua Institute of Chemical Machinery & Automation Co., Ltd. Applicant after: National Drying Technology and Equipment Engineering Technology Research Center Applicant after: Ruide Drying Technology Co., Ltd., Lanzhou Address before: 730050 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Applicant before: Tianhua Chemical Machinery & Automation Research Inst. Applicant before: National Drying Technology and Equipment Engineering Technology Research Center Applicant before: Ruide Drying Technology Co., Ltd., Lanzhou |
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