CN110016530A - A kind of blast furnace gas all dry purification system and its process flow - Google Patents
A kind of blast furnace gas all dry purification system and its process flow Download PDFInfo
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- CN110016530A CN110016530A CN201910372348.6A CN201910372348A CN110016530A CN 110016530 A CN110016530 A CN 110016530A CN 201910372348 A CN201910372348 A CN 201910372348A CN 110016530 A CN110016530 A CN 110016530A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 41
- 238000000746 purification Methods 0.000 title claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 186
- 239000003034 coal gas Substances 0.000 claims abstract description 86
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000000428 dust Substances 0.000 claims abstract description 40
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 239000000571 coke Substances 0.000 claims description 39
- 238000009792 diffusion process Methods 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 238000013517 stratification Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 6
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000004744 fabric Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/02—Dust removal
- C10K1/024—Dust removal by filtration
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/22—Dust arresters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Blast Furnaces (AREA)
Abstract
The invention belongs to metallurgy industry fields, it is related to a kind of blast furnace gas all dry purification system and its process flow, including blast furnace, the blast furnace raw gas purification system being connected to blast furnace, blast furnace raw gas purification system is connected to bag filter through crude gas pipeline, bag filter is connected to the TRT system of parallel connection and the reducer unit for having muffler through purified gas outlet header, after be connected to clean coal gas pipe network, the clean coal gas outlet of every tablecloth bag dust collector is provided with outlet clean coal gas branch pipe blank-plate valve, outlet clean coal gas branch pipe blank-plate valve is by being arranged in parallel outlet stool road and coal gas pressure release branch pipe, pressure release branch gas tube butterfly valve is provided on coal gas pressure release branch pipe, outlet clean coal gas branch pipe butterfly valve is provided on gas exit branch pipe, coal gas pressure release branch pipe, which summarizes, coal gas pressure release general pipeline, coal gas pressure release general pipeline and clean coal gas pipe network are connected, using dense Mutually defeated gray technology, The present invention reduces the demands that dust settling pocket technique uses nitrogen, reduce ash conveying pipe abrasion, save operating cost.
Description
Technical field
The invention belongs to metallurgy industry field, it is related to a kind of blast furnace gas all dry purification system and its process flow.
Background technique
Dry-method bag-type dust collecting compares original wet dedusting, has the advantages that water pollution-free, energy consumption are small, operating cost is low etc.；For
The fundamental state policy for responding state guarantee environment, economizing on resources, old small blast furnace are gradually eliminated, and create, enlarging is large and medium-sized
Blast furnace；Meanwhile using bag-type dust removal system as the preferred option of dedusting of blast furnace gas, existing dry-method bag-type dust collecting scheme exists
Nitrogen pulse back blow nitrogen consumption is big, purified gas pressurization blowback electrisity consumption is big, it is unclean to purge in special operation condition purified gas blowback
With the problems such as cloth bag is hardened, the defeated grey nitrogen consumption of dilute phase is big and ash conveying pipe serious wear.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of demand for reducing dust settling pocket technique and using nitrogen,
Ash conveying pipe abrasion is reduced, the blast furnace gas all dry purification system and its process flow of operating cost are saved.
In order to achieve the above objectives, the invention provides the following technical scheme: a kind of blast furnace gas all dry purification system, including
Blast furnace, the blast furnace raw gas purification system being connected to blast furnace, blast furnace raw gas purification system is connected to several through crude gas pipeline
Tablecloth bag dust collector, bag filter are connected to the TRT system of parallel connection and the decompression for having muffler through purified gas outlet header
Valve group, after be connected to clean coal gas pipe network, the clean coal gas outlet of every tablecloth bag dust collector is provided with outlet clean coal gas branch pipe blind plate
Valve, outlet clean coal gas branch pipe blank-plate valve is by being arranged in parallel purified gas outlet stool and coal gas pressure release branch pipe, coal gas pressure release branch
It is provided with pressure release branch gas tube butterfly valve on pipe, outlet clean coal gas branch pipe butterfly valve is provided on purified gas outlet stool, purified gas goes out
Mouth branch pipe is aggregated into purified gas outlet header, and coal gas pressure release branch pipe, which summarizes, coal gas pressure release general pipeline, coal gas pressure release general pipeline and clean coal
Gas pipe network is connected.
Optionally, be provided on coal gas pressure release general pipeline control bag filter release pressure pressure release gas main adjust
Valve is provided with pressure release gas main blank-plate valve and pressure release gas main butterfly valve on coal gas pressure release general pipeline.
Optionally, nitrogen pulse back blow valve is provided on every tablecloth bag dust collector, top is provided with bag filter safety
Pressure release and diffusion valve, entrance raw coke oven gas branch pipe butterfly valve and entrance raw coke oven gas branch pipe blank-plate valve.
Optionally, it is provided with below every tablecloth bag dust collector and is pumped with the matching used storehouse of bag filter, storehouse pump connection is defeated
Grey pipeline is connected to ash can after summarizing.
Optionally, it is provided with blow tank conveying valve on the pump of storehouse, is provided with storehouse pump intake valve, cloth between storehouse pump and bag filter
Bag dust collector unloads grey stop valve and storehouse pump relief valve, the bottom of storehouse pump are provided with storehouse pump discharge valve, storehouse pump discharge valve and defeated ash
Pipeline is connected.
Optionally, it is provided with ash can diffusion valve at the top of ash can, grey pot bottom is provided with ash can and unloads grey equipment.
Optionally, crude gas pipeline inlet is provided with the pressure sensor for monitoring raw coke oven gas pressure and monitors waste coal
The temperature sensor of temperature degree.
A kind of process flow suitable for blast furnace gas all dry purification system, comprising the following steps:
S1: coal gas dust removal process
The raw coke oven gas that high temperature, high pressure, dust-laden are generated from blast furnace, via work feed after blast furnace raw gas purification system preliminary dust removal
Bag dust collector, opens entrance raw coke oven gas branch pipe butterfly valve and outlet clean coal gas branch pipe butterfly valve, and raw coke oven gas contains after bag filter
Purified gas of the dust quantity no more than 5mg/Nm3 is decompressed to conveying outside after 12kPa by the reducer unit with muffler or TRT system again
To clean coal gas pipe network；
S2: reverse gas cleaning process
According to the different operating conditions of blast furnace gas, blowback medium is determined:
(1) blast furnace operates normally, when temperature sensor detects that raw gas temperature is more than 20 DEG C of its dew-point temperature or more, and
When pressure sensor detects that raw coke oven gas pressure is higher than 0.1MPa, select purified gas as blowback medium；
It needs the bag filter cylinder of blowback to deviate from dust-removing process, closes entrance raw coke oven gas branch pipe butterfly valve and outlet clean coal
Gas branch pipe butterfly valve opens pressure release branch gas tube butterfly valve, makes coal gas in bag filter cylinder by pressure release gas main regulating valve
After pressure reduction to setting value, so that bag filter cylinder internal pressure is less than pressure in purified gas outlet header, turns off and let out
Branch gas tube butterfly valve is pressed, outlet clean coal gas branch pipe butterfly valve is opened, it is net using the high pressure before reducer unit in purified gas outlet header
Purified gas outlet header's internal pressure before coal gas blowback bag-type dust collector cylinder, last bag filter cylinder internal pressure and reducer unit
Power is consistent, then blowback terminates, and opens entrance raw coke oven gas branch pipe butterfly valve, which returns to dust-removing process；
(2) when purified gas temperature is too low, the hardened possibility of cloth bag is increased with coal gas blowback, and when furnace top pressure is lower,
Coal gas blowback pressure difference is small, and blowback effect is poor, so when temperature sensor detects that raw gas temperature is less than or equal to its dew-point temperature
When 20 DEG C or pressure sensor detect that raw coke oven gas pressure is less than or equal to 0.1MPa, select nitrogen as blowback medium；
It needs the bag filter cylinder of blowback to deviate from dust-removing process, closes entrance raw coke oven gas branch pipe butterfly valve and outlet clean coal
Gas branch pipe butterfly valve opens nitrogen pulse back blow valve and carries out nitrogen blowback, and blowback terminates, and closes nitrogen pulse back blow valve, open into
Mouth raw coke oven gas branch pipe butterfly valve and outlet clean coal gas branch pipe butterfly valve, the bag filter cylinder return to dust-removing process；
When conditions permit, dust-removing process can not be deviate from and directly carry out nitrogen pulse back blow；
S3: bag filter unloads ash, defeated ash process
When bag filter bottom, dust stratification reaches preset height or reaches the deashing interval time of design, opens storehouse pump and lets out
Pressure valve keeps bag filter cylinder internal pressure consistent with storehouse pump pressure, opens storehouse pump intake valve and starts to unload ash, and until storehouse, pump reaches
Preset high ash position, closes storehouse pump intake valve and storehouse pumps relief valve；
Blow tank conveying valve and storehouse pump discharge valve are opened, is more than the defeated ash side of concentrated phase 35kg (ash)/1kg (gas) using grey gas ratio
Ash by ash handing pipeline, is delivered to ash can by formula, until storehouse pump stops after excluding ash completely, is then turned off blow tank conveying valve and storehouse
Pump discharge valve；
The bag filter cylinder returns to dust-removing process；
S4: ash can unloads ash process
When ash can high ash position prompts or reach artificial settings value, opening ash can unloads grey equipment and unloads ash.
Optionally, in S1 step, storehouse pump intake valve, storehouse pump discharge valve, storehouse pump relief valve, blow tank conveying valve and ash can
Grey equipment is unloaded to remain off.
Optionally, in the S3 step, the medium of gas source is nitrogen.
The beneficial effects of the present invention are:
1, after the every tablecloth bag dust collector purified gas outlet of the present invention is by a common blank-plate valve, pass through setting and clean coal
The coal gas pressure release branch pipe of gas outlet stool parallel connection, and switching butterfly valve is set in purified gas outlet stool and coal gas pressure release branch pipe, no
The new aperture on deduster cylinder is needed, while saving one branch pipe blank-plate valve of relief pipeline, sets pressure release on coal gas pressure release general pipeline
Gas main blank-plate valve and pressure release gas main butterfly valve, controllable bag filter release pressure to setting value, are guaranteeing dedusting
Effect, and while maintain TRT generated energy, the abrasion to cloth bag is decreased, to having used nitrogen pulse back blow mode
For dry-dedusting system, modification measures are simple.
2, the present invention selects high pressure purified gas as reverse gas cleaning medium during normal production, when special producing condition, manually
Switch nitrogen as pulse backblowing deashing medium, defeated ash carries out the defeated ash of concentrated phase using the storehouse pump of high ash gas ratio, this process flow subtracts
The demand that dust settling pocket technique uses nitrogen is lacked, has reduced ash conveying pipe abrasion, save operating cost, can be applicable to large and medium-sized
The newly-built or transformation project of blast furnace gas all dry purification system.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target of the invention and other advantages can be realized by following specification and
It obtains.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing excellent
The detailed description of choosing, in which:
Fig. 1 is a kind of schematic diagram of blast furnace gas all dry purification system of the present invention.
Appended drawing reference: blast furnace 1, blast furnace raw gas purification system 2, bag filter 3, ash can 4, storehouse pump 5, TRT system 6,
Reducer unit 7, clean coal gas pipe network 9, entrance raw coke oven gas branch pipe butterfly valve 10, entrance raw coke oven gas branch pipe blank-plate valve 11, goes out muffler 8
Mouth clean coal gas branch pipe blank-plate valve 12, outlet clean coal gas branch pipe butterfly valve 13, pressure release branch gas tube butterfly valve 14, pressure release gas main are adjusted
Valve 15, pressure release gas main blank-plate valve 16, pressure release gas main butterfly valve 17, bag filter safety relief and diffusion valve 18, ash
Tank diffusion valve 19, pulse backblowing valve 20, bag filter unload grey stop valve 21, storehouse pump intake valve 22, storehouse pump discharge valve 23, storehouse pump
Relief valve 24, blow tank conveying valve 25, ash handing pipeline 26, ash can unload grey equipment 27, crude gas pipeline 28, coal gas pressure release branch pipe 29,
Purified gas outlet stool 30, coal gas pressure release general pipeline 31, purified gas outlet header 32.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that diagram provided in following embodiment is only to show
Meaning mode illustrates basic conception of the invention, and in the absence of conflict, the feature in following embodiment and embodiment can phase
Mutually combination.
Wherein, the drawings are for illustrative purposes only and are merely schematic diagrams, rather than pictorial diagram, should not be understood as to this
The limitation of invention；Embodiment in order to better illustrate the present invention, the certain components of attached drawing have omission, zoom in or out, not
Represent the size of actual product；It will be understood by those skilled in the art that certain known features and its explanation may be omitted and be in attached drawing
It is understood that.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention
In stating, it is to be understood that if there is the orientation or positional relationship of the instructions such as term " on ", "lower", "left", "right", "front", "rear"
To be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or
It implies that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore is described in attached drawing
The term of positional relationship only for illustration, is not considered as limiting the invention, for the ordinary skill of this field
For personnel, the concrete meaning of above-mentioned term can be understood as the case may be.
Referring to Fig. 1, a kind of blast furnace gas all dry purification system, including blast furnace 1, the blast furnace famine coal being connected to blast furnace 1
Gas purification system 2, blast furnace raw gas purification system 2 are connected to several tablecloth bag dust collectors 3, bag-type dust through crude gas pipeline 28
Device 3 is connected in parallel TRT system 6 and the reducer unit 7 that has muffler 8 through purified gas outlet header 32, after be connected to it is net
Gaspipe network 9, the clean coal gas outlet of every tablecloth bag dust collector 3 are provided with outlet clean coal gas branch pipe blank-plate valve 12, export clean coal
Gas branch pipe blank-plate valve 12 is by being arranged in parallel purified gas outlet stool 30 and coal gas pressure release branch pipe 29, coal gas pressure release branch pipe 29
On be provided with pressure release branch gas tube butterfly valve 14, be provided on purified gas outlet stool 30 outlet clean coal gas branch pipe butterfly valve 13, clean coal
Gas outlet stool 30 is aggregated into purified gas outlet header 32, and coal gas pressure release branch pipe 29, which summarizes, coal gas pressure release general pipeline 31, and coal gas is let out
It presses general pipeline 31 and clean coal gas pipe network 9 to connect, control bag filter 3 is provided on coal gas pressure release general pipeline 31 and is released the pressure release of pressure
Gas main regulating valve 15 is provided with pressure release gas main blank-plate valve 16 and pressure release gas main butterfly on coal gas pressure release general pipeline 31
Valve 17.
In the present embodiment, it is provided with nitrogen pulse back blow valve 20 on every tablecloth bag dust collector 3, top is provided with bag-type dust
Device safety relief and diffusion valve 18, entrance raw coke oven gas branch pipe butterfly valve 10 and entrance raw coke oven gas branch pipe blank-plate valve 11.
In the present embodiment, it is provided with below every tablecloth bag dust collector 3 and the matching used storehouse of bag filter 3 pump 5, storehouse pump
It is provided with blow tank conveying valve 25 on 5, is provided with storehouse pump intake valve 22 between storehouse pump 5 and bag filter 3, bag filter unloads
Grey stop valve 21 and storehouse pump relief valve 24, and the bottom of storehouse pump 5 is provided with storehouse pump discharge valve 23, storehouse pump discharge valve 23 and ash pipeline
Road 26 is connected, and pump 5 connection ash handing pipeline 26 in storehouse is connected to ash can 4 after summarizing, and ash can diffusion valve 19 is provided at the top of ash can 4,
4 bottom of ash can is provided with ash can and unloads grey equipment 27.
In the present embodiment, 28 inlet of crude gas pipeline is provided with pressure sensor and use for monitoring raw coke oven gas pressure
In the temperature sensor of monitoring raw gas temperature.
A kind of process flow suitable for blast furnace gas all dry purification system, comprising the following steps:
S1: coal gas dust removal process
The raw coke oven gas that high temperature, high pressure, dust-laden are generated from blast furnace 1, after 1 raw coke oven gas purification system of blast furnace, 2 preliminary dust removal
Work feed bag dust collector 3 opens entrance raw coke oven gas branch pipe butterfly valve 10 and outlet clean coal gas branch pipe butterfly valve 13, and raw coke oven gas is removed through cloth bag
After dirt device 3, purified gas of the dustiness no more than 5mg/Nm3 is decompressed to by the reducer unit 7 with muffler 8 or TRT system 6 again
It is outer after about 12kPa to be delivered to clean coal gas pipe network 9；
S2: reverse gas cleaning process
According to the different operating conditions of 1 coal gas of blast furnace, blowback medium is determined:
(1) blast furnace 1 operates normally, when temperature sensor detects that raw gas temperature is more than 20 DEG C of its dew-point temperature or more,
And pressure sensor detect raw coke oven gas pressure be higher than 0.1MPa when, select purified gas as blowback medium；
It needs 3 cylinder of bag filter of blowback to deviate from dust-removing process, closes entrance raw coke oven gas branch pipe butterfly valve 10 and outlet
Clean coal gas branch pipe butterfly valve 13 opens pressure release branch gas tube butterfly valve 14, makes bag filter 3 by pressure release gas main regulating valve 15
After gas pressure is reduced to setting value in cylinder, so that 3 cylinder internal pressure of bag filter is less than in purified gas outlet header 32
Pressure turns off pressure release branch gas tube butterfly valve 14, opens outlet clean coal gas branch pipe butterfly valve 13, utilizes purified gas before reducer unit 7
3 cylinder of high pressure purified gas blowback bag-type dust collector in outlet header 32, last 3 cylinder internal pressure of bag filter and pressure reducing valve
Pressure is consistent in purified gas outlet header 32 before group 7, then blowback terminates, and opens entrance raw coke oven gas branch pipe butterfly valve 10, which removes
3 cylinder of dirt device returns to dust-removing process；
(2) when purified gas temperature is too low, the hardened possibility of cloth bag is increased with coal gas blowback, and when furnace top pressure is lower,
Coal gas blowback pressure difference is small, and blowback effect is poor, so when temperature sensor detects that raw gas temperature is less than or equal to its dew-point temperature
When 20 DEG C or pressure sensor detect that raw coke oven gas pressure is less than or equal to 0.1MPa, select nitrogen as blowback medium；
It needs 3 cylinder of bag filter of blowback to deviate from dust-removing process, closes entrance raw coke oven gas branch pipe butterfly valve 10 and outlet
Clean coal gas branch pipe butterfly valve 13 opens nitrogen pulse back blow valve 20 and carries out nitrogen blowback, and blowback terminates, and closes nitrogen pulse back blow valve
20, entrance raw coke oven gas branch pipe butterfly valve 10 and outlet clean coal gas branch pipe butterfly valve 13 are opened, which returns to dedusting work
Sequence；
When conditions permit, dust-removing process can not be deviate from and directly carry out nitrogen pulse back blow；
S3: bag filter 3 unloads ash, defeated ash process
When 3 bottom dust stratification of bag filter reaches preset height or reaches the deashing interval time of design, opening storehouse is pumped
Relief valve 24, pumping 3 cylinder internal pressure of bag filter with storehouse, 5 pressure are consistent, and opening storehouse pump intake valve 22 starts to unload ash, directly
5 are pumped to storehouse and reaches preset high ash position, close storehouse pump intake valve 22 and storehouse pumps relief valve 24；
Blow tank conveying valve 25 and storehouse pump discharge valve 23 are opened, is more than that 35kg (ash)/1kg (gas) concentrated phase is defeated using grey gas ratio
Ash by ash handing pipeline 26, is delivered to ash can 4 by grey mode, until storehouse pump 5 stops after excluding ash completely, it is defeated to be then turned off storehouse pump
Grey valve 25 and storehouse pump discharge valve 23；
3 cylinder of bag filter returns to dust-removing process；
S4: ash can 4 unloads ash process
When 4 high ash position of ash can prompts or reach artificial settings value, opening ash can unloads grey equipment 27 and unloads ash.
In the present embodiment, in S1 step, storehouse pump intake valve 22, storehouse pump discharge valve 23, storehouse pump relief valve 24, blow tank conveying
Valve 25 and ash can unload grey equipment 27 and remain off.
In the present embodiment, in the S3 step, the medium of gas source is nitrogen.
After the every tablecloth bag dust collector purified gas outlet of the present invention is by a common blank-plate valve, pass through setting and purified gas
The coal gas pressure release branch pipe of outlet stool parallel connection, and switching butterfly valve is set in purified gas outlet stool and coal gas pressure release branch pipe, it is not required to
Will the new aperture on deduster cylinder, while saving one branch pipe blank-plate valve of relief pipeline, set pressure release coal on coal gas pressure release general pipeline
Gas general pipeline blank-plate valve and pressure release gas main butterfly valve, controllable bag filter release pressure to setting value, are guaranteeing dedusting effect
Fruit, and while maintain TRT generated energy, the abrasion to cloth bag is decreased, to having used nitrogen pulse back blow mode to do
For method dust pelletizing system, modification measures are simple.
The present invention selects high pressure purified gas as reverse gas cleaning medium during normal production；When special producing condition, cut manually
Nitrogen is changed as pulse backblowing deashing medium；Defeated ash carries out the defeated ash of concentrated phase using the storehouse pump of high ash gas ratio；This process flow is reduced
The demand that dust settling pocket technique uses nitrogen reduces ash conveying pipe abrasion, saves operating cost；It can be applicable to large and medium-sized height
The newly-built or transformation project of producer gas full-dry method purifying system.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of blast furnace gas all dry purification system, including blast furnace, the blast furnace raw gas purification system being connected to blast furnace, blast furnace
Raw coke oven gas purification system is connected to several tablecloth bag dust collectors through crude gas pipeline, and bag filter connects through purified gas outlet header
The reducer unit for being connected in parallel TRT system and having muffler, after be connected to clean coal gas pipe network, it is characterised in that: it is described every
The clean coal gas outlet of tablecloth bag dust collector is provided with outlet clean coal gas branch pipe blank-plate valve, the outlet clean coal gas branch pipe blank-plate valve
By being arranged in parallel purified gas outlet stool and coal gas pressure release branch pipe, pressure release coal gas branch is provided on the coal gas pressure release branch pipe
Pipe butterfly valve, outlet clean coal gas branch pipe butterfly valve is provided on the purified gas outlet stool, and the purified gas outlet stool is aggregated into
Purified gas outlet header, the coal gas pressure release branch pipe, which summarizes, coal gas pressure release general pipeline, the coal gas pressure release general pipeline and clean coal tracheae
Net is connected.
2. a kind of blast furnace gas all dry purification system according to claim 1, it is characterised in that: the coal gas pressure release is total
It is provided with control bag filter on pipe to release the pressure release gas main regulating valve of pressure, is provided on the coal gas pressure release general pipeline
Pressure release gas main blank-plate valve and pressure release gas main butterfly valve.
3. a kind of blast furnace gas all dry purification system according to claim 1, it is characterised in that: every tablecloth bag dust collector
On be provided with nitrogen pulse back blow valve, top is provided with bag filter safety relief and diffusion valve, entrance raw coke oven gas branch pipe butterfly
Valve and entrance raw coke oven gas branch pipe blank-plate valve.
4. a kind of blast furnace gas all dry purification system according to claim 1, it is characterised in that: every tablecloth bag removes
It is provided with below dirt device and is pumped with the matching used storehouse of bag filter, storehouse pump connection ash handing pipeline is connected to ash can after summarizing.
5. a kind of blast furnace gas all dry purification system according to claim 4, it is characterised in that: be arranged on the storehouse pump
Have a blow tank conveying valve, be provided with storehouse pump intake valve between the storehouse pump and bag filter, bag filter unload grey stop valve with
And storehouse pumps relief valve, the bottom of the storehouse pump is provided with storehouse pump discharge valve, and the storehouse pump discharge valve is connected with ash handing pipeline.
6. a kind of blast furnace gas all dry purification system according to claim 4, it is characterised in that: set at the top of the ash can
It is equipped with ash can diffusion valve, the ash pot bottom is provided with ash can and unloads grey equipment.
7. a kind of blast furnace gas all dry purification system according to claim 1, it is characterised in that: the crude gas pipeline
Inlet is provided with the temperature sensor of pressure sensor and monitoring raw gas temperature for monitoring raw coke oven gas pressure.
8. a kind of process flow suitable for blast furnace gas all dry purification system, which comprises the following steps:
S1: coal gas dust removal process
The raw coke oven gas that high temperature, high pressure, dust-laden are generated from blast furnace, is removed via work feed bag after blast furnace raw gas purification system preliminary dust removal
Dirt device opens entrance raw coke oven gas branch pipe butterfly valve and outlet clean coal gas branch pipe butterfly valve, and raw coke oven gas is after bag filter, dustiness
No more than 5mg/Nm3Purified gas pass through the outer clean coal tracheae that is delivered to after the reducer unit with muffler or the decompression of TRT system again
Net；
S2: reverse gas cleaning process
According to the different operating conditions of blast furnace gas, blowback medium is determined:
(1) blast furnace operates normally, when temperature sensor detects that raw gas temperature is more than 20 DEG C of its dew-point temperature or more, and pressure
When sensor detects that raw coke oven gas pressure is higher than 0.1MPa, select purified gas as blowback medium；
It needs the bag filter cylinder of blowback to deviate from dust-removing process, closes entrance raw coke oven gas branch pipe butterfly valve and outlet purified gas branch
Pipe butterfly valve opens pressure release branch gas tube butterfly valve, makes gas pressure in bag filter cylinder by pressure release gas main regulating valve
After being reduced to setting value, so that bag filter cylinder internal pressure is less than pressure in purified gas outlet header, pressure release coal is turned off
Gas branch pipe butterfly valve opens outlet clean coal gas branch pipe butterfly valve, utilizes the high pressure purified gas before reducer unit in purified gas outlet header
Pressure one in purified gas outlet header before blowback bag-type dust collector cylinder, last bag filter cylinder internal pressure and reducer unit
It causes, then blowback terminates, and opens entrance raw coke oven gas branch pipe butterfly valve, which returns to dust-removing process；
(2) when temperature sensor detects that raw gas temperature is less than or equal to 20 DEG C of its dew-point temperature or pressure sensor detects
When raw coke oven gas pressure is less than or equal to 0.1MPa, select nitrogen as blowback medium；
It needs the bag filter cylinder of blowback to deviate from dust-removing process, closes entrance raw coke oven gas branch pipe butterfly valve and outlet purified gas branch
Pipe butterfly valve opens nitrogen pulse back blow valve and carries out nitrogen blowback, and blowback terminates, and closes nitrogen pulse back blow valve, and it is waste to open entrance
Branch gas tube butterfly valve and outlet clean coal gas branch pipe butterfly valve, the bag filter cylinder return to dust-removing process；
When conditions permit, dust-removing process can not be deviate from and directly carry out nitrogen pulse back blow；
S3: bag filter unloads ash, defeated ash process
When bag filter bottom, dust stratification reaches preset height or reaches the deashing interval time of design, opens storehouse and pumps pressure release
Valve keeps bag filter cylinder internal pressure consistent with storehouse pump pressure, opens storehouse pump intake valve and starts to unload ash, and until storehouse, pump reaches pre-
If high ash position, close storehouse pump intake valve and storehouse and pump relief valve；
Blow tank conveying valve and storehouse pump discharge valve are opened, being more than the defeated grey mode of 35kg (ash)/1kg (gas) concentrated phase using grey gas ratio will
Ash is delivered to ash can by ash handing pipeline, until storehouse pump stops after excluding ash completely, is then turned off blow tank conveying valve and storehouse pumps out
Mouth valve；
The bag filter cylinder returns to dust-removing process；
S4: ash can unloads ash process
When ash can high ash position prompts or reach artificial settings value, opening ash can unloads grey equipment and unloads ash.
9. a kind of process flow of blast furnace gas all dry purification system according to claim 8, it is characterised in that: in S1
In step, storehouse pump intake valve, storehouse pump discharge valve, storehouse pump relief valve, blow tank conveying valve and ash can unload grey equipment and remain turned-off shape
State.
10. a kind of process flow of blast furnace gas all dry purification system according to claim 8, it is characterised in that:
In S3 step, the medium of gas source is nitrogen.
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