CN110016530B - Blast furnace gas full-dry purification system and process flow thereof - Google Patents
Blast furnace gas full-dry purification system and process flow thereof Download PDFInfo
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- CN110016530B CN110016530B CN201910372348.6A CN201910372348A CN110016530B CN 110016530 B CN110016530 B CN 110016530B CN 201910372348 A CN201910372348 A CN 201910372348A CN 110016530 B CN110016530 B CN 110016530B
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- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000000746 purification Methods 0.000 title claims abstract description 27
- 239000000428 dust Substances 0.000 claims abstract description 140
- 230000003584 silencer Effects 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 254
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 67
- 238000007664 blowing Methods 0.000 claims description 66
- 229910052757 nitrogen Inorganic materials 0.000 claims description 35
- 239000004744 fabric Substances 0.000 claims description 24
- 238000007599 discharging Methods 0.000 claims description 18
- 239000003034 coal gas Substances 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000000571 coke Substances 0.000 claims 3
- 230000006837 decompression Effects 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 238000005299 abrasion Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003911 water pollution Methods 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
Abstract
The invention belongs to the field of metallurgical industry, and relates to a blast furnace gas full dry method purification system and a process flow thereof, wherein the blast furnace gas full dry method purification system comprises a blast furnace, the blast furnace raw gas purification system is communicated with the blast furnace, the blast furnace raw gas purification system is connected to a bag dust remover through a raw gas pipeline, the bag dust remover is connected to a TRT system and a pressure reducing valve group with a silencer in parallel through a clean gas outlet main pipe and then is communicated to a clean gas pipeline network, an outlet clean gas branch blind plate valve is arranged at the clean gas outlet of each bag dust remover, an outlet branch pipeline and a gas pressure relief branch pipe are arranged in parallel, a pressure relief branch pipe butterfly valve is arranged on the gas pressure relief branch pipe, an outlet clean gas branch pipe is provided with a butterfly valve, the pressure relief main pipe is communicated with the clean gas pipeline, and the pressure relief main pipe is communicated with the clean gas pipeline.
Description
Technical Field
The invention belongs to the field of metallurgical industry, and relates to a blast furnace gas full-dry purification system and a process flow thereof.
Background
Compared with the original wet dust removal, the dry bag dust removal has the advantages of no water pollution, low energy consumption, low operation cost and the like; in order to respond to the basic national policy of protecting the environment and saving resources of the country, the old small-sized blast furnace is gradually eliminated, and is newly built and expanded into a large-sized and medium-sized blast furnace; meanwhile, the cloth bag dust removing system is used as a preferred scheme for blast furnace gas dust removal, and the existing dry cloth bag dust removing scheme has the problems of high nitrogen pulse back blowing nitrogen consumption, high net gas pressurizing back blowing electricity consumption, uncleanness in back blowing of net gas under special working conditions, hardening of cloth bags, high dilute phase ash conveying nitrogen consumption, serious abrasion of ash conveying pipelines and the like.
Disclosure of Invention
In view of the above, the invention aims to provide a blast furnace gas full-dry method purification system and a process flow thereof, which reduce the requirement of a bag-type dust removal technology on nitrogen use, reduce the abrasion of an ash conveying pipeline and save the operation cost.
In order to achieve the above purpose, the present invention provides the following technical solutions: the blast furnace gas full-dry method purification system comprises a blast furnace, a blast furnace raw gas purification system communicated with the blast furnace, wherein the blast furnace raw gas purification system is connected to a plurality of cloth bag dust collectors through raw gas pipelines, the cloth bag dust collectors are connected to a TRT system in parallel and a pressure reducing valve group with a silencer through a clean gas outlet main pipe and then are communicated to a clean gas pipeline network, an outlet clean gas branch pipe blind plate valve is arranged at the clean gas outlet of each cloth bag dust collector, the outlet clean gas branch pipe blind plate valve is provided with a clean gas outlet branch pipe and a gas pressure relief branch pipe in parallel, a pressure relief gas branch pipe butterfly valve is arranged on the gas pressure relief branch pipe, an outlet clean gas branch pipe butterfly valve is arranged on the clean gas outlet branch pipe, the clean gas outlet branch pipe is summarized to the clean gas outlet main pipe, the gas pressure relief main pipe is summarized to be communicated with the clean gas pipeline network.
Optionally, a pressure relief gas main pipe regulating valve for controlling the relief pressure of the bag-type dust collector is arranged on the gas pressure relief main pipe, and a pressure relief gas main pipe blind plate valve and a pressure relief gas main pipe butterfly valve are arranged on the gas pressure relief main pipe.
Optionally, each bag-type dust collector is provided with a nitrogen pulse back-blowing valve, and the top of each bag-type dust collector is provided with a safety pressure relief and release valve, an inlet raw gas branch pipe butterfly valve and an inlet raw gas branch pipe blind plate valve.
Optionally, a bin pump matched with the bag-type dust collector is arranged below each bag-type dust collector, and the bin pump is connected to the ash tank after being communicated with the ash conveying pipeline.
Optionally, a bin pump ash conveying valve is arranged on the bin pump, a bin pump inlet valve, a bag-type dust remover ash discharging cut-off valve and a bin pump pressure release valve are arranged between the bin pump and the bag-type dust remover, a bin pump outlet valve is arranged at the bottom of the bin pump, and the bin pump outlet valve is connected with an ash conveying pipeline.
Optionally, an ash tank diffusing valve is arranged at the top of the ash tank, and ash discharging equipment is arranged at the bottom of the ash tank.
Optionally, a pressure sensor for monitoring the pressure of the raw gas and a temperature sensor for monitoring the temperature of the raw gas are arranged at the inlet of the raw gas pipeline.
The process flow suitable for the blast furnace gas full-dry purification system comprises the following steps:
s1: dust removal process for coal gas
The method comprises the steps of generating high-temperature, high-pressure and dust-containing raw gas from a blast furnace, primarily removing dust through a raw gas purification system of the blast furnace, then delivering the raw gas to a cloth bag dust remover, opening an inlet raw gas branch pipe butterfly valve and an outlet clean gas branch pipe butterfly valve, delivering the raw gas to a clean gas pipe network after the raw gas passes through the cloth bag dust remover, and delivering the clean gas with dust content of not more than 5mg/Nm3 to the outside after the clean gas is depressurized to 12kPa through a pressure reducing valve group with a silencer or a TRT system;
s2: back blowing ash removing process
Determining a blowback medium according to different working conditions of blast furnace gas:
(1) The blast furnace normally operates, and when the temperature sensor detects that the temperature of the raw gas exceeds the dew point temperature by more than 20 ℃ and the pressure sensor detects that the pressure of the raw gas is higher than 0.1MPa, clean gas is selected as a back blowing medium;
the method comprises the steps of removing dust from a bag-type dust collector cylinder body needing back blowing, closing an inlet raw gas branch pipe butterfly valve and an outlet clean gas branch pipe butterfly valve, opening a pressure relief gas branch pipe butterfly valve, reducing the pressure of gas in the bag-type dust collector cylinder body to a set value through a pressure relief gas main pipe regulating valve, enabling the pressure in the bag-type dust collector cylinder body to be smaller than the pressure in a clean gas outlet main pipe, closing the pressure relief gas branch pipe butterfly valve, opening an outlet clean gas branch pipe butterfly valve, back blowing the bag-type dust collector cylinder body by utilizing high-pressure clean gas in the clean gas outlet main pipe before a pressure relief valve group, and finally opening the inlet raw gas branch pipe butterfly valve after back blowing is finished and the bag-type dust collector cylinder body returns to the dust collection process;
(2) When the temperature of the clean gas is too low, the possibility of bag hardening is increased by back blowing of the gas, and when the pressure of the top of the furnace is low, the pressure difference of the back blowing of the gas is small, and the back blowing effect is poor, nitrogen is selected as a back blowing medium when the temperature sensor detects that the temperature of the raw gas is less than or equal to 20 ℃ of the dew point temperature of the raw gas or the pressure sensor detects that the pressure of the raw gas is less than or equal to 0.1 MPa;
a dust removing process of removing the bag-type dust remover cylinder body needing back blowing, closing an inlet raw gas branch pipe butterfly valve and an outlet clean gas branch pipe butterfly valve, opening a nitrogen pulse back blowing valve to carry out nitrogen back blowing, closing the nitrogen pulse back blowing valve after back blowing is finished, opening the inlet raw gas branch pipe butterfly valve and the outlet clean gas branch pipe butterfly valve, and returning the bag-type dust remover cylinder body to the dust removing process;
when the conditions allow, nitrogen pulse back blowing can be directly carried out without removing the dust removing procedure;
s3: dust discharging and conveying process of bag-type dust remover
When the ash deposition at the bottom of the bag-type dust collector reaches a preset height or reaches a designed ash removal interval time, opening a bin pump pressure relief valve to enable the pressure in the barrel of the bag-type dust collector to be consistent with the bin pump pressure, opening a bin pump inlet valve to start ash discharge until the bin pump reaches a preset high ash level, and closing the bin pump inlet valve and the bin pump pressure relief valve;
opening a bin pump ash conveying valve and a bin pump outlet valve, conveying ash to an ash tank through an ash conveying pipeline by adopting a dense phase ash conveying mode that the ash-to-gas ratio exceeds 35kg (ash)/1 kg (gas), stopping until the bin pump completely discharges ash, and then closing the bin pump ash conveying valve and the bin pump outlet valve;
the barrel of the cloth bag dust remover returns to the dust removing process;
s4: ash discharging process of ash pot
When the high ash level of the ash tank prompts or reaches the artificial set value, opening ash discharging equipment of the ash tank to discharge ash.
Optionally, in step S1, the bin pump inlet valve, the bin pump outlet valve, the bin pump pressure release valve, the bin pump ash delivery valve, and the ash can ash discharge device remain closed.
Optionally, in step S3, the medium of the gas source is nitrogen.
The invention has the beneficial effects that:
1. according to the invention, after the clean gas outlet of each cloth bag dust collector passes through a public blind plate valve, the coal gas pressure relief branch pipe connected in parallel with the clean gas outlet branch pipe is arranged, and the switching butterfly valve is arranged between the clean gas outlet branch pipe and the coal gas pressure relief branch pipe, so that a new hole is not required on a dust collector cylinder body, and meanwhile, one branch blind plate valve of a pressure relief pipeline is saved, and the blind plate valve of the pressure relief coal gas main pipe and the butterfly valve of the pressure relief coal gas main pipe are arranged on the coal gas pressure relief main pipe, so that the pressure relief of the cloth bag dust collector can be controlled to a set value, the dust collection effect is ensured, the generated energy of TRT is maintained, the abrasion to the cloth bag is reduced, and the improvement measures are simple for a dry dust collection system adopting a nitrogen pulse back blowing mode.
2. The invention selects high-pressure clean gas as the back-blowing ash removing medium in normal production, and manually switches nitrogen as the pulse back-blowing ash removing medium in special production conditions, and the ash conveying adopts a bin pump with high ash-gas ratio to carry out dense-phase ash conveying.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a blast furnace gas all-dry purification system of the present invention.
Reference numerals: the blast furnace 1, a blast furnace raw gas purification system 2, a bag-type dust remover 3, an ash tank 4, a bin pump 5, a TRT system 6, a pressure reducing valve set 7, a silencer 8, a clean gas pipe network 9, an inlet raw gas branch pipe butterfly valve 10, an inlet raw gas branch pipe blind valve 11, an outlet clean gas branch pipe blind valve 12, an outlet clean gas branch pipe butterfly valve 13, a pressure relief gas branch pipe butterfly valve 14, a pressure relief gas main pipe regulating valve 15, a pressure relief gas main pipe blind valve 16, a pressure relief gas main pipe butterfly valve 17, a bag-type dust remover safety pressure relief valve 18, an ash tank relief valve 19, a pulse back-blowing valve 20, a bag-type dust remover ash discharging cut-off valve 21, a bin pump inlet valve 22, a bin pump outlet valve 23, a bin pump pressure relief valve 24, a bin pump ash conveying valve 25, an ash conveying pipe 26, an ash tank ash discharging device 27, a raw gas pipe 28, a pressure relief branch pipe 29, a clean gas outlet branch pipe 30, a gas main pipe 31 and a clean gas outlet main pipe 32.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a blast furnace gas full dry method purification system comprises a blast furnace 1, a blast furnace raw gas purification system 2 communicated with the blast furnace 1, wherein the blast furnace raw gas purification system 2 is connected to a plurality of bag-type dust collectors 3 through raw gas pipelines 28, the bag-type dust collectors 3 are connected to a TRT system 6 and a pressure reducing valve 7 with a silencer 8 which are connected in parallel through a clean gas outlet main pipe 32 and then are communicated to a clean gas pipe network 9, an outlet clean gas branch blind plate valve 12 is arranged at the clean gas outlet of each bag-type dust collector 3, a pressure relief branch pipe 14 is arranged on the gas pressure relief branch pipe 29 through a clean gas outlet branch pipe 30 and a gas relief branch pipe 29 which are connected in parallel, an outlet clean gas branch pipe 13 is arranged on the clean gas outlet branch pipe 30, the clean gas outlet branch pipe 30 is summarized to the clean gas outlet main pipe 32, the gas relief main pipe 31 is communicated with the clean gas main pipe 9, a gas main pipe 15 for controlling the pressure of the bag-type dust collectors 3 is arranged on the pressure relief main pipe 31, and a butterfly valve for regulating valve for pressure relief is arranged on the pressure relief main pipe 31, and a pressure relief main pipe for pressure relief valve for pressure relief is arranged on the main pipe for pressure relief of the clean gas 3 is provided with a butterfly valve for pressure relief valve for 16, and a pressure relief main pipe for pressure relief of pressure is arranged on the main pipe for pressure relief main pipe for pressure of the clean gas.
In the embodiment, a nitrogen pulse back-flushing valve 20 is arranged on each bag-type dust collector 3, and a bag-type dust collector safety pressure relief and release valve 18, an inlet raw gas branch pipe butterfly valve 10 and an inlet raw gas branch pipe blind plate valve 11 are arranged at the top of each bag-type dust collector.
In the embodiment, a bin pump 5 matched with the bag-type dust collectors 3 is arranged below each bag-type dust collector 3, a bin pump ash conveying valve 25 is arranged on each bin pump 5, a bin pump inlet valve 22, a bag-type dust collector ash discharging cut-off valve 21 and a bin pump pressure release valve 24 are arranged between each bin pump 5 and each bag-type dust collector 3, a bin pump outlet valve 23 is arranged at the bottom of each bin pump 5, the bin pump outlet valves 23 are connected with ash conveying pipelines 26, the bin pumps 5 are connected to the ash tanks 4 after being gathered through the ash conveying pipelines 26, ash tank discharging valves 19 are arranged at the tops of the ash tanks 4, and ash tank ash discharging equipment 27 is arranged at the bottoms of the ash tanks 4.
In this embodiment, a pressure sensor for monitoring the raw gas pressure and a temperature sensor for monitoring the raw gas temperature are provided at the inlet of the raw gas pipe 28.
The process flow suitable for the blast furnace gas full-dry purification system comprises the following steps:
s1: dust removal process for coal gas
The method comprises the steps of generating high-temperature, high-pressure and dust-containing raw gas from a blast furnace 1, primarily removing dust through a raw gas purification system 2 of the blast furnace 1, then delivering the raw gas to a cloth bag dust remover 3, opening an inlet raw gas branch pipe butterfly valve 10 and an outlet clean gas branch pipe butterfly valve 13, delivering the raw gas to the cloth bag dust remover 3, and delivering the clean gas with dust content not more than 5mg/Nm3 to a clean gas pipe network 9 after the clean gas is depressurized to about 12kPa through a pressure reducing valve group 7 with a silencer 8 or a TRT system 6;
s2: back blowing ash removing process
According to different working conditions of the blast furnace 1 gas, determining a blowback medium:
(1) The blast furnace 1 operates normally, and when the temperature sensor detects that the temperature of the raw gas exceeds the dew point temperature by more than 20 ℃ and the pressure sensor detects that the pressure of the raw gas is higher than 0.1MPa, clean gas is selected as a back blowing medium;
the method comprises the steps of removing dust from a barrel of a bag-type dust collector 3 needing back blowing, closing an inlet raw gas branch pipe butterfly valve 10 and an outlet raw gas branch pipe butterfly valve 13, opening a pressure relief gas branch pipe butterfly valve 14, reducing the pressure of gas in the barrel of the bag-type dust collector 3 to a set value through a pressure relief gas main pipe regulating valve 15, enabling the pressure in the barrel of the bag-type dust collector 3 to be smaller than the pressure in a purified gas outlet main pipe 32, closing the pressure relief gas branch pipe butterfly valve 14, opening the outlet raw gas branch pipe butterfly valve 13, back blowing the barrel of the bag-type dust collector 3 by utilizing high-pressure purified gas in the front of a pressure relief valve group 7, and finally opening the inlet raw gas branch pipe butterfly valve 10 after the back blowing is finished and the pressure in the front of the pressure relief valve group 7 is consistent with the pressure in the purified gas outlet main pipe 32, and returning the barrel of the bag-type dust collector 3 to the dust collecting process;
(2) When the temperature of the clean gas is too low, the possibility of bag hardening is increased by back blowing of the gas, and when the pressure of the top of the furnace is low, the pressure difference of the back blowing of the gas is small, and the back blowing effect is poor, nitrogen is selected as a back blowing medium when the temperature sensor detects that the temperature of the raw gas is less than or equal to 20 ℃ of the dew point temperature of the raw gas or the pressure sensor detects that the pressure of the raw gas is less than or equal to 0.1 MPa;
the cylinder body of the bag-type dust collector 3 needing back blowing is subjected to a dedusting process, an inlet raw gas branch pipe butterfly valve 10 and an outlet clean gas branch pipe butterfly valve 13 are closed, a nitrogen pulse back blowing valve 20 is opened for nitrogen back blowing, the nitrogen pulse back blowing valve 20 is closed after back blowing is finished, the inlet raw gas branch pipe butterfly valve 10 and the outlet clean gas branch pipe butterfly valve 13 are opened, and the cylinder body of the bag-type dust collector 3 is returned to the dedusting process;
when the conditions allow, nitrogen pulse back blowing can be directly carried out without removing the dust removing procedure;
s3: dust discharging and conveying process of bag-type dust collector 3
When the ash deposition at the bottom of the bag-type dust collector 3 reaches a preset height or reaches a designed ash removal interval time, a bin pump pressure relief valve 24 is opened to enable the pressure in the barrel of the bag-type dust collector 3 to be consistent with the pressure of the bin pump 5, a bin pump inlet valve 22 is opened to begin ash discharge until the bin pump 5 reaches a preset high ash level, and the bin pump inlet valve 22 and the bin pump pressure relief valve 24 are closed;
opening a bin pump ash conveying valve 25 and a bin pump outlet valve 23, conveying ash to an ash tank 4 by adopting a dense phase ash conveying mode that the ash-to-gas ratio exceeds 35kg (ash)/1 kg (gas) through an ash conveying pipeline 26 until the bin pump 5 is completely discharged and ash is removed, and then closing the bin pump ash conveying valve 25 and the bin pump outlet valve 23;
the cylinder body of the cloth bag dust remover 3 returns to the dust removing process;
s4: ash discharging process of ash pot 4
When the ash tank 4 is high, the ash tank ash discharging device 27 is opened to discharge ash.
In this embodiment, in step S1, the bin pump inlet valve 22, the bin pump outlet valve 23, the bin pump pressure release valve 24, the bin pump ash valve 25, and the ash can ash discharge device 27 are kept closed.
In this embodiment, in step S3, the medium of the gas source is nitrogen.
According to the invention, after the clean gas outlet of each cloth bag dust collector passes through a public blind plate valve, the coal gas pressure relief branch pipe connected in parallel with the clean gas outlet branch pipe is arranged, and the switching butterfly valve is arranged between the clean gas outlet branch pipe and the coal gas pressure relief branch pipe, so that a new hole is not required on a dust collector cylinder body, and meanwhile, one branch blind plate valve of a pressure relief pipeline is saved, and the blind plate valve of the pressure relief coal gas main pipe and the butterfly valve of the pressure relief coal gas main pipe are arranged on the coal gas pressure relief main pipe, so that the pressure relief of the cloth bag dust collector can be controlled to a set value, the dust collection effect is ensured, the generated energy of TRT is maintained, the abrasion to the cloth bag is reduced, and the improvement measures are simple for a dry dust collection system adopting a nitrogen pulse back blowing mode.
The invention selects high-pressure clean gas as back-blowing ash-cleaning medium during normal production; when special production conditions are met, manually switching nitrogen to be used as pulse back-blowing ash removing medium; the ash conveying adopts a bin pump with high ash-gas ratio to carry out dense-phase ash conveying; the process flow reduces the requirement of the bag dust removal technology on nitrogen use, reduces the abrasion of an ash conveying pipeline, and saves the operation cost; can be applied to new or improved projects of a large and medium-sized blast furnace gas full-dry purification system.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (7)
1. The utility model provides a blast furnace gas all dry method clean system, includes the blast furnace, with blast furnace raw coke oven gas clean system of blast furnace intercommunication, blast furnace raw coke oven gas clean system is connected to a plurality of cloth bag dust remover through raw coke oven gas pipeline, and cloth bag dust remover is connected to parallelly connected TRT system and the relief pressure valve group that has the muffler through clean gas outlet house steward, communicates to clean gas pipe network after, its characterized in that: an outlet clean gas branch pipe blind plate valve is arranged at the clean gas outlet of each cloth bag dust collector, a clean gas outlet branch pipe and a gas pressure relief branch pipe are arranged in parallel by the outlet clean gas branch pipe blind plate valve, a pressure relief gas branch pipe butterfly valve is arranged on the gas pressure relief branch pipe, an outlet clean gas branch pipe butterfly valve is arranged on the clean gas outlet branch pipe, the clean gas outlet branch pipes are gathered to a clean gas outlet main pipe, the gas pressure relief branch pipes are gathered to a gas pressure relief main pipe, and the gas pressure relief main pipe is communicated with a clean gas pipe network; the gas pressure relief main pipe is provided with a pressure relief gas main pipe regulating valve for controlling the pressure relief of the bag-type dust collector, and the gas pressure relief main pipe is provided with a pressure relief gas main pipe blind plate valve and a pressure relief gas main pipe butterfly valve; each bag-type dust remover is provided with a nitrogen pulse back-blowing valve, and the top of each bag-type dust remover is provided with a bag-type dust remover safety pressure relief and release valve, an inlet raw gas branch pipe butterfly valve and an inlet raw gas branch pipe blind plate valve; the pressure sensor for monitoring the pressure of the raw gas and the temperature sensor for monitoring the temperature of the raw gas are arranged at the inlet of the raw gas pipeline; the method also comprises the back-blowing ash cleaning procedure:
determining a blowback medium according to different working conditions of blast furnace gas:
(1) The blast furnace normally operates, and when the temperature sensor detects that the temperature of the raw gas exceeds the dew point temperature by more than 20 ℃ and the pressure sensor detects that the pressure of the raw gas is higher than 0.1MPa, clean gas is selected as a back blowing medium;
the method comprises the steps of removing dust from a bag-type dust collector cylinder body needing back blowing, closing an inlet raw gas branch pipe butterfly valve and an outlet clean gas branch pipe butterfly valve, opening a pressure relief gas branch pipe butterfly valve, reducing the pressure of gas in the bag-type dust collector cylinder body to a set value through a pressure relief gas main pipe regulating valve, enabling the pressure in the bag-type dust collector cylinder body to be smaller than the pressure in a clean gas outlet main pipe, closing the pressure relief gas branch pipe butterfly valve, opening an outlet clean gas branch pipe butterfly valve, back blowing the bag-type dust collector cylinder body by utilizing high-pressure clean gas in the clean gas outlet main pipe before a pressure relief valve group, and finally opening the inlet raw gas branch pipe butterfly valve after back blowing is finished and the bag-type dust collector cylinder body returns to the dust collection process;
(2) When the temperature sensor detects that the temperature of the raw gas is less than or equal to 20 ℃ of the dew point temperature of the raw gas or the pressure sensor detects that the pressure of the raw gas is less than or equal to 0.1MPa, nitrogen is selected as a back blowing medium;
a dust removing process of removing the bag-type dust remover cylinder body needing back blowing, closing an inlet raw gas branch pipe butterfly valve and an outlet clean gas branch pipe butterfly valve, opening a nitrogen pulse back blowing valve to carry out nitrogen back blowing, closing the nitrogen pulse back blowing valve after back blowing is finished, opening the inlet raw gas branch pipe butterfly valve and the outlet clean gas branch pipe butterfly valve, and returning the bag-type dust remover cylinder body to the dust removing process;
when the conditions allow, the nitrogen pulse back blowing can be directly carried out without removing the dust removing procedure.
2. The blast furnace gas all-dry purification system according to claim 1, wherein: and a bin pump matched with the bag-type dust collectors is arranged below each bag-type dust collector, and the bin pump is communicated with an ash conveying pipeline and is connected to an ash tank after being summarized.
3. The blast furnace gas all-dry purification system according to claim 2, wherein: the dust collecting device is characterized in that a bin pump dust conveying valve is arranged on the bin pump, a bin pump inlet valve, a bag dust collector dust discharging cut-off valve and a bin pump pressure release valve are arranged between the bin pump and the bag dust collector, a bin pump outlet valve is arranged at the bottom of the bin pump, and the bin pump outlet valve is connected with a dust conveying pipeline.
4. A blast furnace gas all dry process purification system as claimed in claim 3, wherein: the top of the ash tank is provided with an ash tank diffusing valve, and the bottom of the ash tank is provided with ash tank unloading equipment.
5. The process flow suitable for the blast furnace gas full-dry purification system is characterized by comprising the following steps of:
s1: dust removal process for coal gas
The high-temperature, high-pressure and dust-containing raw gas is generated from the blast furnace, is primarily dedusted by a blast furnace raw gas purifying system and is sent to a cloth bag dust collector, an inlet raw gas branch pipe butterfly valve and an outlet raw gas branch pipe butterfly valve are opened, and the dust content of the raw gas is not more than 5mg/Nm after the raw gas passes through the cloth bag dust collector 3 The clean gas is decompressed by a decompression valve group with a silencer or a TRT system and then is externally conveyed to a clean gas pipe network;
s2: back blowing ash removing process
Determining a blowback medium according to different working conditions of blast furnace gas:
(1) The blast furnace normally operates, and when the temperature sensor detects that the temperature of the raw gas exceeds the dew point temperature by more than 20 ℃ and the pressure sensor detects that the pressure of the raw gas is higher than 0.1MPa, clean gas is selected as a back blowing medium;
the method comprises the steps of removing dust from a bag-type dust collector cylinder body needing back blowing, closing an inlet raw gas branch pipe butterfly valve and an outlet clean gas branch pipe butterfly valve, opening a pressure relief gas branch pipe butterfly valve, reducing the pressure of gas in the bag-type dust collector cylinder body to a set value through a pressure relief gas main pipe regulating valve, enabling the pressure in the bag-type dust collector cylinder body to be smaller than the pressure in a clean gas outlet main pipe, closing the pressure relief gas branch pipe butterfly valve, opening an outlet clean gas branch pipe butterfly valve, back blowing the bag-type dust collector cylinder body by utilizing high-pressure clean gas in the clean gas outlet main pipe before a pressure relief valve group, and finally opening the inlet raw gas branch pipe butterfly valve after back blowing is finished and the bag-type dust collector cylinder body returns to the dust collection process;
(2) When the temperature sensor detects that the temperature of the raw gas is less than or equal to 20 ℃ of the dew point temperature of the raw gas or the pressure sensor detects that the pressure of the raw gas is less than or equal to 0.1MPa, nitrogen is selected as a back blowing medium;
a dust removing process of removing the bag-type dust remover cylinder body needing back blowing, closing an inlet raw gas branch pipe butterfly valve and an outlet clean gas branch pipe butterfly valve, opening a nitrogen pulse back blowing valve to carry out nitrogen back blowing, closing the nitrogen pulse back blowing valve after back blowing is finished, opening the inlet raw gas branch pipe butterfly valve and the outlet clean gas branch pipe butterfly valve, and returning the bag-type dust remover cylinder body to the dust removing process;
when the conditions allow, nitrogen pulse back blowing can be directly carried out without removing the dust removing procedure;
s3: dust discharging and conveying process of bag-type dust remover
When the ash deposition at the bottom of the bag-type dust collector reaches a preset height or reaches a designed ash removal interval time, opening a bin pump pressure relief valve to enable the pressure in the barrel of the bag-type dust collector to be consistent with the bin pump pressure, opening a bin pump inlet valve to start ash discharge until the bin pump reaches a preset high ash level, and closing the bin pump inlet valve and the bin pump pressure relief valve;
opening a bin pump ash conveying valve and a bin pump outlet valve, conveying ash to an ash tank through an ash conveying pipeline by adopting a dense phase ash conveying mode that the ash-to-gas ratio exceeds 35kg (ash)/1 kg (gas), stopping until the bin pump completely discharges ash, and then closing the bin pump ash conveying valve and the bin pump outlet valve;
the barrel of the cloth bag dust remover returns to the dust removing process;
s4: ash discharging process of ash pot
When the high ash level of the ash tank prompts or reaches the artificial set value, opening ash discharging equipment of the ash tank to discharge ash.
6. The process flow of the blast furnace gas full dry method purification system according to claim 5, which is characterized in that: in the step S1, a bin pump inlet valve, a bin pump outlet valve, a bin pump pressure release valve, a bin pump ash conveying valve and ash tank ash discharging equipment are kept in a closed state.
7. The process flow of the blast furnace gas full dry method purification system according to claim 5, which is characterized in that: in the step S3, the medium of the air source is nitrogen.
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| CN110273036A (en) * | 2019-07-31 | 2019-09-24 | 马鞍山钢铁股份有限公司 | A kind of gravity blast furnace dust catcher ash position monitoring alarm device and monitoring alarm method |
| CN110699505A (en) * | 2019-11-14 | 2020-01-17 | 光阳工程技术有限公司 | Blast furnace gas dry dedusting clean gas blowback ash removal system |
| CN111538284B (en) * | 2020-05-09 | 2020-12-29 | 广州机觉云物联科技有限公司 | Method for performing business management on real-time data based on intelligent stock measurement |
| CN112626300A (en) * | 2020-12-15 | 2021-04-09 | 广西钢铁集团有限公司 | Double-mode back-blowing ash removal device for blast furnace dry-method dust removal cloth bag |
| CN115948628B (en) * | 2022-12-09 | 2023-08-25 | 中冶南方工程技术有限公司 | Blast furnace gas dry dust removal device and method with secondary pressure balance system |
| CN116574857B (en) * | 2023-06-20 | 2024-02-02 | 华北理工大学智能仪器厂 | Blast furnace gas cloth bag dust collector |
| CN117323749A (en) * | 2023-11-03 | 2024-01-02 | 北京铝能清新环境技术有限公司 | Dry defluorination and desulfurization system for electrolytic aluminum flue gas and treatment method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006119681A1 (en) * | 2005-05-08 | 2006-11-16 | Metallurgical Design Institute Of Shandong Province | Bag pulse reverse blast ash removal device |
| CN102140562A (en) * | 2011-03-02 | 2011-08-03 | 柳州钢铁股份有限公司 | Dry deduster for blast furnace gas |
| CN206308383U (en) * | 2016-12-05 | 2017-07-07 | 河北津西钢铁集团大方重工科技有限公司 | A kind of blast furnace gas processing system |
| CN108165693A (en) * | 2018-03-09 | 2018-06-15 | 中冶京诚工程技术有限公司 | Batch can presses the coupling process and system of coal-gas recovering and blast furnace gas dry dust removal |
| CN210001881U (en) * | 2019-05-06 | 2020-01-31 | 中冶赛迪工程技术股份有限公司 | blast furnace gas full-dry purification system |
-
2019
- 2019-05-06 CN CN201910372348.6A patent/CN110016530B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006119681A1 (en) * | 2005-05-08 | 2006-11-16 | Metallurgical Design Institute Of Shandong Province | Bag pulse reverse blast ash removal device |
| CN102140562A (en) * | 2011-03-02 | 2011-08-03 | 柳州钢铁股份有限公司 | Dry deduster for blast furnace gas |
| CN206308383U (en) * | 2016-12-05 | 2017-07-07 | 河北津西钢铁集团大方重工科技有限公司 | A kind of blast furnace gas processing system |
| CN108165693A (en) * | 2018-03-09 | 2018-06-15 | 中冶京诚工程技术有限公司 | Batch can presses the coupling process and system of coal-gas recovering and blast furnace gas dry dust removal |
| CN210001881U (en) * | 2019-05-06 | 2020-01-31 | 中冶赛迪工程技术股份有限公司 | blast furnace gas full-dry purification system |
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