CN107354255A - A kind of method for extending coal gas plate type preheater service life - Google Patents

A kind of method for extending coal gas plate type preheater service life Download PDF

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Publication number
CN107354255A
CN107354255A CN201710495226.7A CN201710495226A CN107354255A CN 107354255 A CN107354255 A CN 107354255A CN 201710495226 A CN201710495226 A CN 201710495226A CN 107354255 A CN107354255 A CN 107354255A
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China
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plate type
type preheater
preheater
gas
service life
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CN201710495226.7A
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CN107354255B (en
Inventor
宋云山
李立彬
李洪亮
闫本领
齐立东
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Beijing Shougang Co Ltd
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Beijing Shougang Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • C21B9/14—Preheating the combustion air

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Air Supply (AREA)

Abstract

The invention discloses a kind of method for extending coal gas plate type preheater service life, belong to hot-blast stove technical field.The method for extending coal gas plate type preheater service life comprises the following steps：Limit gas preheating minimum temperature >=130 DEG C of the plate type preheater；Limit minimum temperature >=130 DEG C of the plate type preheater exhanst gas outlet pipeline.The method of present invention extension coal gas plate type preheater service life can extend the service life of coal gas plate type preheater, cost-effective.

Description

A kind of method for extending coal gas plate type preheater service life
Technical field
The present invention relates to hot-blast stove technical field, more particularly to a kind of side for extending coal gas plate type preheater service life Method.
Background technology
Flue gas after blast furnace and hot blast cupola combustion originally uses heat pipe-type gas preheater mostly, but typically uses several years Afterwards, heat exchange of heat pipe is serious because the reasons such as dust stratification, corrosion fail, and preheating temperature is greatly reduced, or even entirely ineffective, have lost Largely using waste heat, maintenance cost raises and can not solve root problem.In the prior art, using coal gas plate type preheater Some shortcomings of heat exchange of heat pipe are overcome, coal gas plate type preheater heat transfer efficiency is high, corrosion-resistant, fouling phenomenon unobvious, heat The thermal efficiency of furnace system can maintain high-level operation for a long time, so as to reduce blast furnace gas consumption, saved operation into This, is applied on the hot blast stove system of more seat height stoves, achieves good effect at home in recent years, is a kind of relatively advanced High-efficiency and energy-saving type preheater.But the service life of coal gas plate type preheater is shorter, cause cost higher.
The content of the invention
The present invention provides a kind of method for extending coal gas plate type preheater service life, solves or partly solves existing Coal gas plate type preheater service life is shorter in technology, causes the technical problem that cost is higher.
In order to solve the above technical problems, the invention provides a kind of method bag for extending coal gas plate type preheater service life Include following steps：Limit gas preheating minimum temperature >=130 DEG C of the plate type preheater；Limit the plate type preheater flue gas Minimum temperature >=130 DEG C of outlet conduit.
Further, the method for extending coal gas plate type preheater service life also includes：In the plate type preheater Second line of a couplet casing on brushing resistant material.
Further, the method for present invention extension coal gas plate type preheater service life also includes：In the board-like preheating Detection means is set on the exhanst gas outlet pipeline of the smoke inlet pipelines of device and the plate type preheater, it is described board-like for detecting The CO content PPm differences of the exhanst gas outlet pipeline of the smoke inlet pipelines of preheater and the plate type preheater.
Further, the detection means includes：Carbon monoxide detector, it is arranged on the smoke inlet pipelines of the plate type preheater And on the exhanst gas outlet pipeline of the plate type preheater.
Further, the smoke inlet pipelines of the plate type preheater and described board-like pre- are detected by the carbon monoxide detector The CO content PPm differences of the exhanst gas outlet pipeline of hot device.
Further, the smoke inlet pipelines of the plate type preheater and the smoke outlet tube of the plate type preheater are limited Road CO content PPm differences<1÷N÷1.02×106, N is the total number of channels that plate type preheater plate is formed.
Further, the method for present invention extension coal gas plate type preheater service life also includes：In the board-like preheating Safety device is set in the gas entry pipeline of device and the gas exit pipeline of the plate type preheater, it is board-like for separating online Preheater.
Further, the safety device includes：Gas partition push-pull valve, the coal gas for being arranged on the plate type preheater enter In the gas exit pipeline of mouth pipeline and the plate type preheater.
The one or more technical schemes provided in the embodiment of the present application, have at least the following technical effects or advantages：
Due to limiting gas preheating minimum temperature >=130 DEG C of plate type preheater, board-like preheater flue gas outlet is limited Minimum temperature >=130 DEG C in road, so, it is shorter to efficiently solve coal gas plate type preheater service life in the prior art, causes The higher technical problem of cost, by limiting plate type preheater gas preheating minimum temperature >=130 DEG C, condensed water contains in coal gas CL—Deng Korrosionsmedium, the corrosion of heat exchanger plate will be accelerated by being run under less than 130 DEG C operating modes, and it is minimum to limit gas preheating Behind temperature >=130 DEG C, it can avoid corroding the section extension preheater life-span, the exhanst gas outlet pipeline for limiting plate type preheater is minimum Temperature >=130 DEG C, contain S in flue gas—、CL—Deng acidic materials, the corruption of low temperature dew point be present between 90 DEG C of -110 DEG C of sections in temperature Lose, therefore exhanst gas outlet pipeline minimum temperature is limited into >=130 DEG C can effectively to reduce low-temperature dew point corrosion, improve the preheater longevity Life, has saved cost.
Brief description of the drawings
Fig. 1 is the flow chart of the method for extension coal gas plate type preheater service life provided in an embodiment of the present invention；
Fig. 2 is the structural representation of Fig. 1 coal gas plate type preheater；
Fig. 3 is Fig. 2 A-A to sectional view.
Embodiment
Referring to Fig. 1-3, a kind of method for extending coal gas plate type preheater service life provided in an embodiment of the present invention includes Following steps：
Step 1, gas preheating minimum temperature >=130 DEG C of the plate type preheater 1 are limited.
Step 2, the exhanst gas outlet pipeline 1-4 of the plate type preheater 1 minimum temperature >=130 DEG C are limited.
Gas preheating minimum temperature >=130 DEG C of the technical scheme due to limiting plate type preheater, are limited board-like pre- Minimum temperature >=130 DEG C of hot device exhanst gas outlet pipeline, so, efficiently solve coal gas plate type preheater use in the prior art Life-span is shorter, causes the technical problem that cost is higher, by limiting plate type preheater gas preheating minimum temperature >=130 DEG C, coal Condensed water contains CL in gas—Deng Korrosionsmedium, the corrosion of heat exchanger plate will be accelerated by being run under less than 130 DEG C operating modes, limit After determining gas preheating minimum temperature >=130 DEG C, it can avoid corroding the section extension preheater life-span, limit the cigarette of plate type preheater Gas outlet conduit minimum temperature >=130 DEG C, contain S in flue gas—、CL—Deng acidic materials, in temperature between 90 DEG C of -110 DEG C of sections Low-temperature dew point corrosion be present, therefore exhanst gas outlet pipeline minimum temperature is limited into >=130 DEG C can effectively to reduce the corruption of low temperature dew point Erosion, the preheater life-span is improved, has saved cost.
The method that the present invention extends coal gas plate type preheater service life also includes：
The brushing resistant material on the second line of a couplet casing 1-5 of the plate type preheater 1, the coal gas plate type preheater use During dust and purging condensed water deposition be present, contain CL in dust and condensed water—Deng Korrosionsmedium, gas tank is caused The bottom plate and side plate corrosion thinning of body lower collecting box, solved by coal gas casing lower collecting box bottom plate and side plate brush acid corrosion-resistant coating Casing corrosion thinning problem extends the preheater life-span.
The method that the present invention extends coal gas plate type preheater service life also includes：
In the smoke inlet pipelines 1-3 of the plate type preheater 1 and exhanst gas outlet pipeline 1-4 of the plate type preheater 1 Upper setting detection means 3, the smoke inlet pipelines 1-3 and the plate type preheater that detect the plate type preheater 1 flue gas go out Mouth pipeline 1-4 CO content PPm differences.
The structure of detection means is discussed in detail.
The detection means includes：Carbon monoxide detector 3-1.
The carbon monoxide detector 3-1 is fixedly installed on the smoke inlet pipelines 1-3 of the plate type preheater 1 and described board-like pre- On the exhanst gas outlet pipeline 1-4 of hot device 1.Specifically, in the present embodiment, the carbon monoxide detector 3-1, which is bolted, sets Put on the smoke inlet pipelines 1-3 of the plate type preheater 1 and the exhanst gas outlet pipeline 1-4 of the plate type preheater 1, at it In its embodiment, the carbon monoxide detector 3-1 can be otherwise the plate type preheater 1 as described in being fixedly installed on pivot pin etc. On the exhanst gas outlet pipeline 1-4 of smoke inlet pipelines 1-3 and the plate type preheater 1.
The smoke inlet pipelines 1-3 of the plate type preheater 1 and the board-like preheating are detected by the carbon monoxide detector 3-1 The exhanst gas outlet pipeline 1-4 of device CO content PPm differences.
Limit the smoke inlet pipelines 1-3 of the plate type preheater 1 and exhanst gas outlet pipeline 1- of the plate type preheater 1 4 CO content PPm differences<1÷N÷1.02×106, N is the total number of channels that the plate 1-6 of plate type preheater 1 is formed.Due to plate The plate 1-6 sides of formula preheater 1 are that coal gas opposite side is flue gas, coal gas will be caused to be directly entered when plate 1-6 is cracking Safety in production hidden danger in flue gas be present, pass through the smoke inlet pipelines 1-3 and exhanst gas outlet in plate type preheater 1 for this situation Pipeline 1-4 sets up carbon monoxide detector 3-1, limits preheater flue gas gateway pipeline CO content PPm differences<1÷N÷1.02×106, To determine whether the plate of coal gas plate type preheater or other positions have leakage point position, ensure plate type preheater safe operation.
The method that the present invention extends coal gas plate type preheater service life also includes：Safety device 2.
In the gas entry pipeline 1-1 of the plate type preheater 1 and gas exit pipeline 1-2 of the plate type preheater 1 Interior setting safety device 2, for separating plate type preheater 1 online.
The structure of safety device is discussed in detail.
The safety device includes：Gas partition push-pull valve 2-1.
The gas partition push-pull valve 2-1 is fixedly installed on the gas entry pipeline 1-1 of the plate type preheater 1 and described In the gas exit pipeline 1-2 of plate type preheater 1.Specifically, in the present embodiment, the gas partition push-pull valve 2-1 leads to Cross bolt and be fixedly installed on the gas entry pipeline 1-1 of the plate type preheater 1 and the gas outlet tube of the plate type preheater 1 In road 1-2, in other embodiments, the gas partition push-pull valve 2-1 can such as pivot pin be fixedly installed otherwise In the gas entry pipeline 1-1 of the plate type preheater 1 and the gas exit pipeline 1-2 of the plate type preheater 1.Described Plate type preheater 1 can separate plate type preheater 1 online when there is internal leakage, it is ensured that safety.
In order to become apparent from the embodiment of the present invention, introduced below from the application method of the embodiment of the present invention.
It is first by limiting plate type preheater gas preheating minimum temperature >=130 DEG C, condensed water contains CL in coal gas—Deng corrosion Property medium, under less than 130 DEG C operating modes operation will accelerate the corrosion of heat exchanger plate, limit gas preheating minimum temperature >=130 After DEG C, it can avoid corroding the section extension preheater life-span.Limit exhanst gas outlet pipeline minimum temperature >=130 of plate type preheater DEG C, S is contained in flue gas—、CL—Deng acidic materials, low-temperature dew point corrosion be present between 90 DEG C of -110 DEG C of sections in temperature, therefore will Exhanst gas outlet pipeline minimum temperature, which limits >=130 DEG C, can effectively reduce low-temperature dew point corrosion, improve the preheater life-span, save Cost.
The smoke inlet pipelines 1-3 of the plate type preheater 1 and exhanst gas outlet pipeline 1-4 of plate type preheater 1 sets up CO detections Instrument 3-1, limit flue gas gateway pipeline CO content PPm differences<1÷N÷1.02×106。
Coal gas plate type preheater 1 is made up of multigroup plate 1-6, and plate 1-6 is welded to form by stainless steel plate, plate 1-6 mono- Side flowing is flue gas, and opposite side is coal gas, and when plate weld cracking or plate occur damaged, coal gas will be entered by damaged part Into flue gas, the CO content PPm values that this situation exports the flue for causing plate type preheater 1 1-4 enter more than flue The size of mouthful 1-3 CO content PPm values, smoke inlet pipelines 1-3 and exhanst gas outlet pipeline 1-4 CO content PPm differences can be with Clearly reflect the sealing situation of gas preheater plate.
It is determined that the gas volume for occurring damage leakage using one plate of fume side is converted in flue gas as measuring and calculating radix, the numerical value CO contents PPm is exhanst gas outlet pipeline 1-4 and smoke inlet pipelines 1-3 CO content PPm value addeds, and this numerical value is to coal gas plate Formula preheater maintaining has decisive directive function.
Calculation is as follows：QIt is empty=0.7QCoal；QCigarette=(QCoal+QIt is empty) × 0.8=(QCoal+0.7QCoal) × 0.6=1.02QCoal。
Single plate damage causes exhanst gas outlet pipeline and inlet duct CO content PPm value addeds
=1 ÷ N × QCoal÷QCigarette
=1 ÷ NQCoal÷1.02×QCoal
=1 ÷ N ÷ 1.02
=(<1÷N÷1.02×106)×106
1÷N÷1.02×106CO contents PPm value addeds when being leaked for monolithic plate, N-gas preheater plate are formed Total number of channels；QCoal- gas flow, unit Nm3/h；QCigarette- flue gas flow, unit Nm3/h；QIt is empty- air mass flow, unit Nm3/ h；QLet outThe flow of gas leak, unit Nm after-single plate breakage3/h。
The brushing resistant material on the second line of a couplet casing 1-5 of plate type preheater 1, is deposited during coal gas plate type preheater use Contain CL in dust and purging condensed water deposition, dust and condensed water—Deng Korrosionsmedium, coal gas casing lower collecting box is caused Bottom plate and side plate corrosion thinning, solve casing corrosion by coal gas casing lower collecting box bottom plate and side plate brush acid corrosion-resistant coating Thinned problem extends the preheater life-span.
It should be noted last that above embodiment is merely illustrative of the technical solution of the present invention and unrestricted, Although the present invention is described in detail with reference to example, it will be understood by those within the art that, can be to the present invention Technical scheme modify or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention, it all should cover Among scope of the presently claimed invention.

Claims (8)

  1. A kind of 1. method for extending coal gas plate type preheater service life, it is characterised in that comprise the following steps：
    Limit gas preheating minimum temperature >=130 DEG C of the plate type preheater (1)；
    Limit minimum temperature >=130 DEG C of the exhanst gas outlet pipeline (1-4) of the plate type preheater (1).
  2. 2. according to the method for claim 1, it is characterised in that the method for extending coal gas plate type preheater service life Also include：
    The brushing resistant material on the second line of a couplet casing (1-5) of the plate type preheater (1).
  3. 3. according to the method for claim 1, it is characterised in that the method for extending coal gas plate type preheater service life Also include：
    In the smoke inlet pipelines (1-3) of the plate type preheater (1) and the exhanst gas outlet pipeline of the plate type preheater (1) Detection means (3) is set on (1-4), for detecting the smoke inlet pipelines (1-3) of the plate type preheater (1) and described board-like The CO content PPm differences of the exhanst gas outlet pipeline (1-4) of preheater.
  4. 4. according to the method for claim 3, it is characterised in that the detection means includes：
    Carbon monoxide detector (3-1), it is arranged on the smoke inlet pipelines (1-3) of the plate type preheater (1) and the plate type preheater (1) on exhanst gas outlet pipeline (1-4).
  5. 5. according to the method for claim 4, it is characterised in that：
    The smoke inlet pipelines (1-3) of the plate type preheater (1) and described board-like pre- are detected by the carbon monoxide detector (3-1) The CO content PPm differences of the exhanst gas outlet pipeline (1-4) of hot device.
  6. 6. according to the method for claim 5, it is characterised in that：
    Limit the smoke inlet pipelines (1-3) of the plate type preheater (1) and the exhanst gas outlet pipeline of the plate type preheater (1) The CO content PPm differences of (1-4)<1÷N÷1.02×106, N is that the passage that the plate (1-6) of plate type preheater (1) is formed is total Number.
  7. 7. according to the method for claim 1, it is characterised in that the method for extending coal gas plate type preheater service life Also include：
    In the gas entry pipeline (1-1) of the plate type preheater (1) and the gas exit pipeline of the plate type preheater (1) Safety device (2) is set in (1-2), for separating plate type preheater (1) online.
  8. 8. according to the method for claim 7, it is characterised in that the safety device includes：
    Gas partition push-pull valve (2-1), it is arranged on the gas entry pipeline (1-1) of the plate type preheater (1) and described board-like In the gas exit pipeline (1-2) of preheater (1).
CN201710495226.7A 2017-06-26 2017-06-26 A method of extending coal gas plate type preheater service life Active CN107354255B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2095345U (en) * 1991-01-17 1992-02-05 张家口冶金制氧机备件厂 Gas preheater
CN103131812A (en) * 2011-12-01 2013-06-05 上海雷林工程技术有限公司 Plate-type air and coal gas double-preheating system for hot blast stove
CN203613205U (en) * 2013-08-02 2014-05-28 北京首钢股份有限公司 Corrosion-resistant blast furnace gas heat exchanger

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2095345U (en) * 1991-01-17 1992-02-05 张家口冶金制氧机备件厂 Gas preheater
CN103131812A (en) * 2011-12-01 2013-06-05 上海雷林工程技术有限公司 Plate-type air and coal gas double-preheating system for hot blast stove
CN203613205U (en) * 2013-08-02 2014-05-28 北京首钢股份有限公司 Corrosion-resistant blast furnace gas heat exchanger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨国新 等: "韶钢3200m3高炉热风炉烟气CO成分异常的影响", 《炼铁》 *

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