CN107354255B - A method of extending coal gas plate type preheater service life - Google Patents
A method of extending coal gas plate type preheater service life Download PDFInfo
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- CN107354255B CN107354255B CN201710495226.7A CN201710495226A CN107354255B CN 107354255 B CN107354255 B CN 107354255B CN 201710495226 A CN201710495226 A CN 201710495226A CN 107354255 B CN107354255 B CN 107354255B
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- type preheater
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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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Abstract
The invention discloses a kind of methods 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 is the following steps are included: 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 that the present invention extends coal gas plate type preheater service life can extend the service life of coal gas plate type preheater, save the cost.
Description
Technical field
The present invention relates to hot-blast stove technical field, in particular to a kind of side for extending coal gas plate type preheater service life
Method.
Background technique
Flue gas after blast furnace and hot blast cupola combustion originally mostly uses greatly heat pipe-type gas preheater, but generally uses several years
Afterwards, heat exchange of heat pipe is failed seriously due to dust stratification, corrosion etc., and preheating temperature is greatly reduced or even entirely ineffective, is had lost
Largely using waste heat, maintenance cost increases and not can solve root problem.In the prior art, using coal gas plate type preheater
Some disadvantages of heat exchange of heat pipe are overcome, coal gas plate type preheater heat transfer efficiency is high, corrosion-resistant, fouling phenomenon is unobvious, heat
The thermal efficiency of furnace system can maintain high-level operation for a long time, thus reduce blast furnace gas consumption, saved operation at
This, is applied on the hot blast stove system of more seat height furnaces at home in recent years, achieves good effect, 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, leads to higher cost.
Summary of the invention
The present invention provides a kind of method for extending coal gas plate type preheater service life, solves or partially solves existing
The technical issues of coal gas plate type preheater service life is shorter in technology, leads to higher cost.
In order to solve the above technical problems, the present invention provides a kind of method packets for extending coal gas plate type preheater service life
It includes following steps: limiting 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 further include: in the plate type preheater
Second line of a couplet cabinet on brushing resistant material.
Further, the present invention extends the method for coal gas plate type preheater service life further include: in the board-like preheating
Detection device 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 difference of the exhanst gas outlet pipeline of the smoke inlet pipelines of preheater and the plate type preheater.
Further, the detection device includes: carbon monoxide detector, and the smoke inlet pipelines of the plate type preheater are arranged in
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 difference 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 difference < 1 ÷ N ÷ 1.02 × 106, N is the total number of channels that plate type preheater plate is formed.
Further, the present invention extends the method for coal gas plate type preheater service life further include: 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 gate valve, and the coal gas that the plate type preheater is arranged in enters
In the gas exit pipeline of mouth pipeline and the plate type preheater.
One or more technical solutions provided in the embodiments 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 technical issues of higher cost, by limiting plate type preheater gas preheating minimum temperature >=130 DEG C, condensed water contains in coal gas
CL—Equal corrosive medias, operation will accelerate the corrosion of heat exchanger plate under lower than 130 DEG C operating conditions, and it is minimum to limit gas preheating
Behind temperature >=130 DEG C, corrosion section can be avoided and extend the preheater service life, the exhanst gas outlet pipeline for limiting plate type preheater is minimum
S is contained in flue gas in temperature >=130 DEG C—、CL—Equal acidic materials, in temperature, between 90 DEG C of -110 DEG C of sections, there are low temperature dew point corruption
Erosion, therefore low-temperature dew point corrosion, raising preheater longevity can be effectively reduced by >=130 DEG C of the restriction of exhanst gas outlet pipeline minimum temperature
Life, has saved cost.
Detailed description of the invention
Fig. 1 is the flow chart of the method provided in an embodiment of the present invention for extending coal gas plate type preheater service life；
Fig. 2 is the structural schematic diagram of the coal gas plate type preheater of Fig. 1；
Fig. 3 is the sectional view along A-A of Fig. 2.
Specific embodiment
Referring to Fig. 1-3, it is provided in an embodiment of the present invention it is a kind of extend coal gas plate type preheater service life method include
Following steps:
Step 1, gas preheating minimum temperature >=130 DEG C of the plate type preheater 1 are limited.
Step 2, minimum temperature >=130 DEG C of the exhanst gas outlet pipeline 1-4 of the plate type preheater 1 are limited.
Gas preheating minimum temperature >=130 DEG C of the technical scheme due to limiting plate type preheater, limit 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
The technical issues of service life is shorter, leads to higher cost, by limiting plate type preheater gas preheating minimum temperature >=130 DEG C, coal
Condensed water contains CL in gas—Equal corrosive medias, operation will accelerate the corrosion of heat exchanger plate, limit under lower than 130 DEG C operating conditions
After determining gas preheating minimum temperature >=130 DEG C, corrosion section can be avoided and extend the preheater service life, limit the cigarette of plate type preheater
S is contained in flue gas in gas outlet conduit minimum temperature >=130 DEG C—、CL—Equal acidic materials, in temperature between 90 DEG C of -110 DEG C of sections
There are low-temperature dew point corrosions, therefore low temperature dew point corruption can be effectively reduced by >=130 DEG C of the restriction of exhanst gas outlet pipeline minimum temperature
Erosion improves the preheater service life, has saved cost.
The method of present invention extension coal gas plate type preheater service life further include:
The brushing resistant material on the second line of a couplet cabinet 1-5 of the plate type preheater 1, the coal gas plate type preheater use
There is dust and purging condensed water deposition in the process, contains CL in dust and condensed water—Equal corrosive medias, cause gas tank
The bottom plate and side plate corrosion thinning of body lower collecting box are solved by coal gas cabinet lower collecting box bottom plate and side plate brush acid corrosion-resistant coating
Cabinet corrosion thinning problem extends the preheater service life.
The method of present invention extension coal gas plate type preheater service life further include:
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 device 3, the flue gas of the smoke inlet pipelines 1-3 and the plate type preheater that detect the plate type preheater 1 go out
The CO content PPm difference of mouth pipeline 1-4.
The structure of detection device is discussed in detail.
The detection device includes: carbon monoxide detector 3-1.
The carbon monoxide detector 3-1 is fixed at 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
It sets 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 fixed at pivot pin
On the exhanst gas outlet pipeline 1-4 of smoke inlet pipelines 1-3 and the plate type preheater 1.
By the carbon monoxide detector 3-1 detect the plate type preheater 1 smoke inlet pipelines 1-3 and the board-like preheating
The CO content PPm difference of the exhanst gas outlet pipeline 1-4 of device.
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 difference < 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
It is flue gas that the side plate 1-6 of formula preheater 1, which is the coal gas other side, coal gas will be caused to be directly entered when plate 1-6 cracks
There is safety in production hidden danger in flue gas, passes through the smoke inlet pipelines 1-3 and exhanst gas outlet in plate type preheater 1 for this situation
Pipeline 1-4 adds carbon monoxide detector 3-1, limits preheater flue gas entrance pipeline CO content PPm difference < 1 ÷ N ÷ 1.02 × 106,
To determine whether plate or the other positions of coal gas plate type preheater have leakage point, guarantee plate type preheater safe operation.
The method of present invention extension coal gas plate type preheater service life further include: 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 gate valve 2-1.
The gas partition gate valve 2-1 is fixed at 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 gate valve 2-1 is logical
It crosses bolt and is fixed at 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 gate 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 when there is internal leakage online, it is ensured that safety.
In order to become apparent from the embodiment of the present invention, introduced from the application method of the embodiment of the present invention below.
Head is by limiting plate type preheater gas preheating minimum temperature >=130 DEG C, and condensed water contains CL in coal gas—Deng corrosion
Property medium, the corrosion of heat exchanger plate will accelerated lower than operation under 130 DEG C of operating conditions, limiting gas preheating minimum temperature >=130
After DEG C, corrosion section can be avoided and extend the preheater service life.Limit exhanst gas outlet pipeline minimum temperature >=130 of plate type preheater
DEG C, S is contained in flue gas—、CL—Equal acidic materials, in temperature, between 90 DEG C of -110 DEG C of sections, there are low-temperature dew point corrosions, therefore will
Exhanst gas outlet pipeline minimum temperature, which limits >=130 DEG C, can be effectively reduced low-temperature dew point corrosion, improves the preheater service life, saves
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 adds CO detection
Instrument 3-1 limits flue gas entrance pipeline CO content PPm difference < 1 ÷ N ÷ 1.02 × 106。
Coal gas plate type preheater 1 is made of multiple groups 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 the other side is coal gas, and when plate weld cracking or plate occur damaged, coal gas will be entered by damaged part
Into flue gas, this situation enters the CO content PPm value of the flue for causing plate type preheater 1 outlet 1-4 greater than flue
The size of the CO content PPm difference of the CO content PPm value of mouthful 1-3, smoke inlet pipelines 1-3 and exhanst gas outlet pipeline 1-4 can be with
Clearly reflect the sealing situation of gas preheater plate.
Determine that the gas volume for damage leakage occur with one plate of fume side is measuring and calculating radix, which is converted in flue gas
CO content PPm is the CO content PPm value added of exhanst gas outlet pipeline 1-4 and smoke inlet pipelines 1-3, this numerical value is to coal gas plate
Formula preheater maintenance 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 added
=1 ÷ N × QCoal÷QCigarette
=1 ÷ NQCoal÷1.02×QCoal
=1 ÷ N ÷ 1.02
=(< 1 ÷ N ÷ 1.02 × 106)×106
1÷N÷1.02×106CO content PPm value added when leaking 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；QIt lets outThe flow of gas leak, unit Nm after-single plate is damaged3/h。
The brushing resistant material on the second line of a couplet cabinet 1-5 of plate type preheater 1 is deposited in coal gas plate type preheater use process
Contain CL in dust and purging condensed water deposition, dust and condensed water—Equal corrosive medias, cause coal gas cabinet lower collecting box
Bottom plate and side plate corrosion thinning, solve cabinet corrosion by coal gas cabinet lower collecting box bottom plate and side plate brush acid corrosion-resistant coating
Thinned problem extends the preheater service life.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (1)
1. a kind of method for extending coal gas plate type preheater service life, which comprises 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)；
The method for extending coal gas plate type preheater service life further 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 device (3) are 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 difference of the exhanst gas outlet pipeline (1-4) of preheater；
The detection device includes: carbon monoxide detector (3-1), and the smoke inlet pipelines (1-3) in the plate type preheater (1) are arranged
And on the exhanst gas outlet pipeline (1-4) of the plate type preheater (1)；
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 difference of the exhanst gas outlet pipeline (1-4) of hot device；
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 difference of (1-4) < 1 ÷ N ÷ 1.02 × 106, N is that the channel that the plate (1-6) of plate type preheater (1) is formed is total
Number；
The method for extending coal gas plate type preheater service life further include:
The brushing resistant material on the second line of a couplet cabinet (1-5) of the plate type preheater (1)；
The method for extending coal gas plate type preheater service life further 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) are set in (1-2), for separating plate type preheater (1) online；
The safety device includes:
Gas partition gate valve (2-1) is arranged in 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).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710495226.7A CN107354255B (en) | 2017-06-26 | 2017-06-26 | A method of extending coal gas plate type preheater service life |
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| CN201710495226.7A CN107354255B (en) | 2017-06-26 | 2017-06-26 | A method of extending coal gas plate type preheater service life |
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| CN107354255B true CN107354255B (en) | 2019-10-11 |
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| 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 |
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