CN111854453A - Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill - Google Patents

Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill Download PDF

Info

Publication number
CN111854453A
CN111854453A CN202010747144.9A CN202010747144A CN111854453A CN 111854453 A CN111854453 A CN 111854453A CN 202010747144 A CN202010747144 A CN 202010747144A CN 111854453 A CN111854453 A CN 111854453A
Authority
CN
China
Prior art keywords
coal
kiln tail
circulating air
heat
waste gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010747144.9A
Other languages
Chinese (zh)
Inventor
代长福
田丰
陈刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linli Jidong Cement Co Ltd
Original Assignee
Linli Jidong Cement Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linli Jidong Cement Co Ltd filed Critical Linli Jidong Cement Co Ltd
Priority to CN202010747144.9A priority Critical patent/CN111854453A/en
Publication of CN111854453A publication Critical patent/CN111854453A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a method and a system for reducing the discharge amount of sulfide in kiln tail air-taking coal mill waste gas, wherein the method is characterized in that a wet desulphurization process is introduced into a coal powder preparation system, and an original chimney in the coal powder preparation system is removed; in addition, circulating air is added in the pulverized coal preparation system, and a pipeline of the circulating air adopts a heat-insulating pipeline. The method can effectively reduce the SO2 emission concentration in the coal mill waste gas, and can also effectively reduce the oxygen content in the coal powder preparation process.

Description

Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill
Technical Field
The invention relates to the technical field of cement preparation, in particular to a method and a system for reducing the discharge amount of sulfide in waste gas of a kiln tail air-taking coal mill.
Background
In a novel dry-method cement kiln production line, a pulverized coal preparation drying heat source is divided into a kiln head air taking source and a kiln tail air taking source, wherein the kiln tail air taking source can be used more relatively due to the characteristics of gradient utilization of the heat source in waste gas, low oxygen content, high safety and the like. With the increasing requirements of the country on environmental protection, the problem of controlling pollutants in coal mill waste gas is also gradually drawing attention, wherein the problem that how to reduce the emission of waste gas, especially the emission of SO2 in the waste gas, without affecting the production capacity of the coal mill due to the high concentration of SO2 in the coal mill waste gas is a problem which is always expected to be solved in the field. In addition, in the prior art, cold air is required to be introduced to adjust the temperature of the system in the coal grinding process, however, the content of oxygen in the coal grinding mill must be increased in the cold air introduction process, and the influence on the grinding quality of raw coal is caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for reducing the discharge amount of sulfide in the waste gas of a kiln tail air-taking coal mill.
In order to achieve the purpose, the invention adopts the technical scheme that: the method for reducing the discharge amount of the sulfide in the waste gas of the kiln tail wind-taking coal mill is characterized by being realized by the following aspects:
(1) introducing a wet desulphurization process into the coal powder preparation system, namely introducing the final waste gas in the coal powder preparation system into a kiln tail waste gas wet desulphurization system, merging the waste gas into a kiln tail main chimney for discharging after desulphurization, and simultaneously dismantling the original chimney in the coal powder preparation system;
(2) circulating air is added in the coal powder preparation system, and a pipeline of the circulating air adopts a heat-insulating pipeline.
Further, the system for reducing the discharge amount of the sulfide in the exhaust gas of the air coal mill taken from the kiln tail comprises a coal powder preparation system and a kiln tail exhaust gas wet desulphurization system, wherein the coal powder preparation system comprises a raw coal bin, an air swept coal mill, a powder concentrator, a cyclone dust collector and a coal powder bin, one end of the air swept coal mill is connected and communicated with a feed inlet and an air inlet, the other end of the air swept coal mill is connected and communicated with a discharge pipe, the other end of the discharge pipe is connected and communicated with the air inlet of the powder concentrator, an air outlet of the powder concentrator is connected and communicated with the air inlet of the cyclone dust collector, an ash hopper at the bottom of the cyclone dust collector is directly or indirectly connected and communicated with the coal powder bin, and a discharge port at the bottom of the raw; one of the interfaces of a first tee joint is connected with an air inlet of the air swept coal mill, one of the other two interfaces of the first tee joint is connected with a kiln tail waste gas conveying pipeline, the other one of the other two interfaces of the first tee joint is connected with one end of a circulating air pipe, and a first electric louver valve is fixed on the kiln tail waste gas conveying pipeline; similarly, an air outlet of the cyclone dust collector is connected with one interface of a second tee joint through a pipeline, one of the other two interfaces of the second tee joint is connected and communicated with the other end of the circulating air pipe, the other interface of the second tee joint is connected and communicated with an exhaust gas discharge pipe, the other end of the exhaust gas discharge pipe is connected to a kiln tail exhaust gas wet desulphurization system, and an electric butterfly valve is fixedly connected to the exhaust gas discharge pipe; and a second electric louver valve is fixedly connected to the circulating air pipe.
Furthermore, an online dust monitor is fixedly connected to the exhaust gas discharge pipe.
Furthermore, the heat preservation pipeline of the circulating air is characterized in that a heat preservation structure is fixed on the circulating air pipe and comprises a heat preservation material layer and an outer protective material layer, wherein the outer protective material layer is a galvanized iron sheet with the thickness of 0.6mm, the heat preservation material is a composite aluminum magnesium silicate light heat preservation material, the heat preservation material is firstly adhered to the outer wall of the circulating air pipe through an adhesive, then is bundled through glass cloth, then is bundled and fixed through galvanized iron wires, and then is tightly fixed on the outer surface of the galvanized iron sheet through self-tapping screws.
Furthermore, the longitudinal direction and the transverse direction of each galvanized iron sheet are connected by using a pre-rolling seam, the heat insulation materials are required to be tightly attached to the outer surface of the circulating air pipe to be arranged in a staggered joint mode, and no gap is left at the lap joint of each heat insulation material.
Further, the construction method of the heat insulation structure comprises the following specific steps:
(1) cleaning up stains on the outer surface of the circulating air pipe before construction, welding the V-shaped steel bars on the outer surface of the circulating air pipe at intervals of 350mm, and brushing anti-rust paint on welding spots after removing welding slag;
(2) welding a circle of supporting rings made of flat steel on the outer surface of the vertical and inclined pipelines with the outer diameter larger than 800mm at intervals of 3-4m, wherein the width of each supporting ring is 3/4 made of heat-insulating materials, and the thickness of each supporting ring is 5 mm;
(3) taking the lower end of the curved surface of the circulating air pipe as a reference, paving and fixing heat insulation materials from bottom to top for a circle, or taking the flange connecting part of the circulating air pipe as a reference, paving and fixing heat insulation materials from one end to the other end for a circle, wherein the longitudinal and transverse seams are staggered when the heat insulation materials are spliced, the butt joint is tight, and sealing cement or scattered heat insulation materials are filled in the gaps;
(4) bundling the heat-insulating material layer by using glass cloth, and then bundling and fixing by using galvanized iron wires;
(5) cutting the outer protective material according to the actual using amount of the pipeline; then laying the external protective material outside the thermal insulation material by using self-tapping screws; when the composite material is laid, the upper part of a curved surface is taken as a reference, two adjacent external protective materials are connected by adopting a telescopic undercut method in the horizontal direction and are connected by adopting a common undercut method in the vertical direction, or a flange connecting part is taken as a reference, the two adjacent external protective materials are connected by adopting the common undercut method in the circumferential direction and are connected by adopting the telescopic undercut method in the axial direction, and the circumferential joint of the bent part is formed by rolling and covers more than 25 mm; the adjacent external protective materials are tightly butted, and if a gap exists, the gap is blocked by sealing cement.
Compared with the prior art, the invention has the beneficial effects that:
1. the coal mill waste gas is introduced into the wet desulphurization system, and is subjected to desulphurization by the wet desulphurization system and then is discharged by converging into the kiln tail main chimney, SO that the SO2 discharge concentration in the coal mill waste gas is effectively reduced (can be reduced to 30 mg/m)3The following), the purpose of emission reduction is achieved;
2. by dismantling the two chimneys of the coal mill, the exhaust emission points are reduced;
3. the circulating air is added in the pulverized coal preparation system to replace the original cold air, and the circulating air is used for adjusting the system stability, so that the waste gas discharge amount in unit time can be effectively reduced (about 10000 m can be reduced)3/h）；
4. Through the arrangement of the circulating air pipe and the like, waste gas discharged from a cyclone dust collector for preparing pulverized coal can be circularly introduced into the air swept coal mill, cold air is not used, and the oxygen content in the pulverized coal preparation process can be effectively reduced (compared with the arrangement without the circulating air pipe, the oxygen content is reduced by more than 65 percent);
5. the online dust monitor is arranged on the waste gas discharge pipeline, so that the dust concentration in the waste gas is monitored in real time, once the excessive discharge is found, the machine is stopped for inspection, the reason is found out and the reason is corrected;
6. the circulating air is conveyed by using the heat insulation pipeline, the circulating air can be effectively ensured to carry a certain temperature (60-100 ℃), the effect of adjusting the coal grinding temperature due to kiln tail waste gas (about 200 ℃) at the temperature is better than that of cold air, and the system is more stable to operate;
7. by the heat insulation construction method of the heat insulation pipeline, the service life of the heat insulation structure can be effectively prolonged, the heat insulation material is prevented from being invaded by wind and rain, and the heat insulation effect of the heat insulation pipeline on the circulating air pipe is ensured; in addition, the construction method of the heat insulation pipeline heat insulation structure is convenient to operate and good in effect.
Drawings
FIG. 1 is a diagram of the structural connections of a system according to the present invention;
FIG. 2 is a schematic diagram of a portion of the system according to the present invention;
FIG. 3 is a schematic process flow diagram of the present invention;
FIG. 4 is a schematic view of the heat-insulating structure of the heat-insulating pipeline according to the present invention;
the device comprises a powder sweeping coal mill 1.1, a feed inlet 1.2, an air inlet 1.3, a first tee joint 1.4, a discharge pipe 2, a raw coal bin 3, a powder concentrator 4, a cyclone dust collector 5, a coal powder bin 6, a circulating air pipe 7, a kiln tail waste gas conveying pipeline 8, a high-temperature fan 9, a first electric louver valve 10, a pulverized coal ventilator 10.1, a second tee joint 11, a waste gas discharge pipe 12, a second electric louver valve 13, an online dust monitor 14, a kiln tail waste gas wet desulphurization system 15, an electric butterfly valve 16, a heat insulation material layer 17 and an external protection material layer.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The following are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent or similar substitutes should fall within the scope of protection of the present application without departing from the inventive concept. And the details which are not described below should be performed according to the prior art or the conventional techniques in the field.
As shown in fig. 1-4, the system for reducing the emission of sulfides in the exhaust gas of the kiln tail air-taking coal mill of the invention comprises a coal powder preparation system and a kiln tail exhaust gas wet desulphurization system, wherein the coal powder preparation system comprises an air-swept coal mill 1, a powder concentrator 3, a cyclone dust collector 4, a coal powder bin 5 and a raw coal bin 2.
The wind swept coal mill 1 is manufactured by Tangshan dunshi mechanotlite GmbH and has a specification of phi 3.8 x (7.25+3.5) m. This 1 one end of wind swept coal mill is feed arrangement, and feed arrangement comprises feed inlet 1.1, air intake 1.2 and support, and fixed mounting has the welt according to conventional mode in the feed inlet, opens the bar valve of 2 bottoms in raw coal bunker, and raw coal is discharged by the bottom discharge gate in raw coal bunker 2 to in the coal mill 1 is swept to the slip of feed inlet after weighing through speed governing belt weigher. The feeding port 1.1 of the air swept coal mill 1 is inclined upwards, the raw coal bin 2 is fixed above the feeding end of the air swept coal mill 1 through a frame, and the bottom discharging port of the raw coal bin 2 is fixedly connected and communicated with the feeding port 1.1 of the air swept coal mill 1; an air inlet 1.2 of the air sweeping coal mill 1 is connected with a first tee joint 1.3 through a flange, the first tee joint 1.3 is communicated with an air inlet 1.2 of the air sweeping coal mill 1, one of the other two interfaces of the first tee joint 1.3 is fixedly connected with one end of a circulating air pipe 6 through a flange, the other interface is also fixedly connected with a kiln tail waste gas conveying pipeline 7 through a flange or welded, the kiln tail waste gas conveying pipeline 7 is connected with a high-temperature fan 8 and a first electric louver valve 9 through flanges, and kiln tail waste gas is introduced into the air sweeping coal mill 1. The other end of the air swept coal mill 1 is provided with a discharging device which is a discharging pipe 1.4, and the discharging pipe 1.4 is fixedly connected and communicated with an air inlet of the powder concentrator 3 in a conventional manner; the powder concentrator 3 is selected from a high-efficiency powder concentrator (model M1500) produced by environmental engineering technology limited of Jiangsu Keshi, and the lower part of a coarse powder outlet at the bottom of one side of the powder concentrator 3 is connected with a screw conveyor, the coarse powder is conveyed into an air swept coal mill 1 through the screw conveyor for re-ball milling, and an air outlet at the top of the powder concentrator 3 is fixedly connected and communicated with an air inlet of a cyclone dust collector 4 through a pipeline in a conventional mode; the cyclone dust collector 4 is a coal bag dust collector (model is LPMM 2X 7D-218) produced by Jiehua environmental protection science and technology Limited in Zhejiang, and an outlet of a bottom ash bucket of the cyclone dust collector 4 can be directly connected and communicated with a top feeding hole of the pulverized coal bunker 5 or can be connected and communicated with top feeding of the pulverized coal bunker 5 through a screw conveyor in a conventional manner. An air outlet of the cyclone dust collector 4 is fixedly connected with a pulverized coal ventilator 10 through a pipeline in a conventional mode, one interface of a second tee joint 10.1 is fixedly connected to the air outlet of the pulverized coal ventilator 10 in a welding mode, one of the other two interfaces of the second tee joint 10.1 is fixedly connected and communicated with the other end of the circulating air pipe 6 through a flange, and the other interface of the second tee joint is fixedly connected and communicated with an exhaust gas discharge pipe 11 in a conventional mode; a second electric louver valve 12 is fixedly connected to the circulating air pipe 6 in a conventional manner; an online dust monitor 13 (an online dust monitor manufactured by selecting MODEL MODEL2030 of Qingdao Kaiyue) is fixedly connected to the exhaust gas discharge pipe 11 in a conventional manner, the other end of the exhaust gas discharge pipe 11 is connected to a kiln tail exhaust gas wet desulphurization system 14 (a conventional wet desulphurization tower), and an electric butterfly valve 15 is fixedly connected to the exhaust gas discharge pipe 11. The waste gas in the coal powder preparation system is finally introduced into the kiln tail waste gas wet desulphurization system 14 to remove sulfur dioxide, so that the standard discharge is realized.
In actual production, two sets of coal dust preparation systems of the invention are provided, in this case, the two sets of coal dust preparation systems share one high temperature fan 8, the two sets of coal dust preparation systems are connected and communicated with two pipelines through a kiln tail waste gas conveying pipeline 7 through a tee joint, the two pipelines respectively input kiln tail waste gas into the two sets of coal dust preparation systems, finally, waste gas discharge pipes 11 in the two sets of coal dust preparation systems are converged into a main pipeline, and the main pipeline inputs final coal mill waste gas into a kiln tail waste gas wet desulphurization system 14 for desulphurization.
A heat insulation structure is fixed on the periphery of the circulating air pipe 6, the heat insulation structure comprises a heat insulation material layer 16 and an outer protective material layer 17, wherein the outer protective material layer 17 is made of galvanized iron sheets with the thickness of 0.6mm, the heat insulation material of the heat insulation material layer 16 is a composite aluminum magnesium silicate light heat insulation material, the heat insulation material is firstly adhered to the outer wall of the pipeline by using an adhesive, then is bundled by using glass cloth, then is bundled and fixed by using galvanized iron wires, and then is tightly fixed on the outer surface of the galvanized iron sheets by using self-tapping screws; and the longitudinal direction and the transverse direction between each galvanized iron sheet are connected by using a pre-rolling seam, the heat insulation materials are required to be tightly attached to the outer surface of the circulating air pipe and arranged in a staggered joint mode, and no gap is left at the lap joint of each heat insulation material. The circulating air is conveyed by using the heat insulation pipeline, the circulating air can be effectively ensured to carry a certain temperature (60-100 ℃), the temperature effect of the circulating air at the temperature for adjusting the temperature of the coal powder entering the coal powder preparation system caused by kiln tail waste gas (about 200 ℃) is better than that of cold air, and the system is more stable to operate.
Example one
The method for reducing the discharge amount of the sulfide in the exhaust gas of the kiln tail wind-taking coal mill is realized through several aspects:
(1) introducing a wet desulphurization process into the coal powder preparation system, namely introducing the final waste gas of the coal powder preparation system into a kiln tail waste gas wet desulphurization system 14, merging the waste gas into a kiln tail main chimney for discharging after desulphurization, and simultaneously removing the original chimney in the coal powder preparation system, namely the chimney originally connected and communicated with the coal powder ventilator 10, into the connection of a circulating air pipe 6 connected by a second tee joint 10.1 and the connection of a waste gas discharge pipe 11;
(2) in the coal powder preparation system, the waste gas in the coal powder preparation system is partially introduced into an air swept coal mill through a circulating air pipe, the circulating air is used for replacing the original cold air, and a pipeline of the circulating air adopts a heat insulation pipeline;
(3) an online dust monitor 13 is arranged on a main chimney at the tail of the kiln and used for monitoring the dust concentration in the waste gas in real time (once exceeding discharge occurs, stopping inspection is needed once exceeding discharge occurs).
Due to the field arrangement, the circulating air pipe has a plurality of vertical sections, inclined sections and elbows, and the adjacent two vertical sections or the vertical sections are connected with the inclined sections or the two inclined sections by flanges.
The construction method of the heat insulation structure of the heat insulation pipeline of the circulating air comprises the following specific steps:
(1) cleaning up stains on the outer surface of the circulating air pipe before construction, welding the V-shaped steel bars on the outer surface of the circulating air pipe at intervals of 350mm, and brushing anti-rust paint on welding spots after removing welding slag;
(2) welding a circle of supporting rings made of flat steel on the outer surface of the vertical and inclined pipelines with the outer diameter larger than 800mm at intervals of 3-4m, wherein the width of each supporting ring is 3/4 made of heat-insulating materials, and the thickness of each supporting ring is 5 mm;
(3) taking the lower end of the curved surface of the circulating air pipe as a reference, paving and fixing heat insulation materials from bottom to top for a circle, or taking the flange connecting part of the circulating air pipe as a reference, paving and fixing heat insulation materials from one end to the other end for a circle, wherein the longitudinal and transverse seams are staggered when the heat insulation materials are spliced, the butt joint is tight, and sealing cement or scattered heat insulation materials are filled in the gaps;
(4) bundling the heat-insulating material layer by using glass cloth, and then bundling and fixing by using galvanized iron wires;
(5) cutting the outer protective material according to the actual using amount of the pipeline; then laying the external protective material outside the thermal insulation material by using self-tapping screws; when the composite material is laid, the upper part of a curved surface is taken as a reference, two adjacent external protective materials are connected by adopting a telescopic undercut method in the horizontal direction and are connected by adopting a common undercut method in the vertical direction, or a flange connecting part is taken as a reference, the two adjacent external protective materials are connected by adopting the common undercut method in the circumferential direction and are connected by adopting the telescopic undercut method in the axial direction, and the circumferential joint of the bent part is formed by rolling and covers more than 25 mm; the adjacent external protective materials are tightly butted, and if a gap exists, the gap is blocked by sealing cement.
Examples of the invention
The coal powder preparation system of the applicant company adopts two sets of phi 3.8 x (7.25+3.5) m air swept ball mills (a set of ground raw coal and a set of stone coal are designed), the installed power is 1400KW, the air volume of a matched high-temperature fan is 132000 m3/h, the full pressure is 2300Pa, the installed power is 132KW, a bag type dust collector LPMM2 x 7D-218 filtering area is 2180m2, the air volume of a fan of a cyclone dust collector is 120000m3/h, and the installed power is 9000 Pa400KW, the designed production capacity of a raw coal pulverized coal preparation system is 40t/h, and the designed production capacity of a stone coal pulverized coal preparation system is 38 t/h. The drying heat source of the two sets of coal powder preparation systems is air taken from the kiln tail waste heat boiler, and the temperature of the hot air is about 200 ℃. However, the coal mill taking air from the kiln tail of the cement factory has the problem that the drying hot air of the coal mill does not pass through a raw material preparation system, SO the content of SO2 in the hot air is high, although the total exhaust waste gas amount of a coal powder preparation system is small, the actual air quantity of the raw coal mill in operation is 85000 m3H, two coal mills run simultaneously, and the total exhaust emission is about 150000 m3However, the problem of controlling the emission of the coal mill waste gas should not be ignored in view of the problem of high concentration of SO2 in the waste gas.
Based on the above situation, the company decides to introduce the kiln tail waste gas wet desulphurization system, and the set of wet desulphurization system is put into operation to convert SO2 in the waste gas discharged by the coal powder preparation system from the original SO2 (600 mg/m)3) Controlling to 200mg/m3The amount of flue gas can be stably controlled below 50 mg/m3, the design treated amount of the wet desulphurization system is 900000 m3/h, and the actual treated amount of the flue gas is 550000 m 3/h. The original two chimneys in the coal powder preparation system are dismantled, so that the exhaust emission points are reduced; meanwhile, circulating air is added into the pulverized coal preparation system, the temperature in the pulverized coal preparation system is adjusted by using the circulating air, cold air is not used as before, and the exhaust gas amount per unit time of one set of pulverized coal preparation system can be reduced to 10000 m3H is used as the reference value. After the method and the system are put into use and the single raw coal grinding system runs, SO can be reduced every year2Discharge capacity of 127.65 tons; if the raw coal mill and the stone coal mill are operated simultaneously, SO can be reduced every year2The discharge amount is 164.65 tons, and the method has remarkable economic and social benefits.

Claims (6)

1. The method for reducing the discharge amount of the sulfide in the waste gas of the kiln tail wind-taking coal mill is characterized by being realized by the following aspects:
(1) introducing a wet desulphurization process into the coal powder preparation system, namely introducing the final waste gas in the coal powder preparation system into a kiln tail waste gas wet desulphurization system, merging the waste gas into a kiln tail main chimney for discharging after desulphurization, and simultaneously dismantling the original chimney in the coal powder preparation system;
(2) circulating air is added in the coal powder preparation system, and a pipeline of the circulating air adopts a heat-insulating pipeline.
2. A system for reducing the discharge amount of sulfide in exhaust gas of an air coal mill taken from a kiln tail is characterized by comprising a raw coal bin, an air swept coal mill, a powder concentrator, a cyclone dust collector and a coal dust bin, wherein one end of the air swept coal mill is connected and communicated with a feeding hole and an air inlet; one of the interfaces of a first tee joint is connected with an air inlet of the air swept coal mill, one of the other two interfaces of the first tee joint is connected with a kiln tail waste gas conveying pipeline, the other one of the other two interfaces of the first tee joint is connected with one end of a circulating air pipe, and a first electric louver valve is fixed on the kiln tail waste gas conveying pipeline; similarly, an air outlet of the cyclone dust collector is connected with one interface of a second tee joint through a pipeline, one of the other two interfaces of the second tee joint is connected and communicated with the other end of the circulating air pipe, the other interface of the second tee joint is connected and communicated with an exhaust gas discharge pipe, the other end of the exhaust gas discharge pipe is connected to a kiln tail exhaust gas wet desulphurization system, and an electric butterfly valve is fixedly connected to the exhaust gas discharge pipe; and a second electric louver valve is fixedly connected to the circulating air pipe.
3. The system for reducing the discharge amount of the sulfides in the exhaust gas of the kiln tail air-taking coal mill as claimed in claim 2, wherein an online dust monitor is fixedly connected to the exhaust gas discharge pipe.
4. The system for reducing the emission of the sulfides in the exhaust gas of the kiln tail air-coal mill according to claim 2 or 3, wherein the heat-insulating pipeline of the circulating air is a heat-insulating structure fixed on the circulating air pipe, the heat-insulating structure comprises a heat-insulating material layer and an external protective material layer, the external protective material is galvanized iron sheet with the thickness of 0.6mm, the heat-insulating material is composite aluminum magnesium silicate light heat-insulating material, the heat-insulating material is firstly adhered to the outer wall of the circulating air pipe by using an adhesive, then is bundled by using glass cloth and then is bundled and fixed by using galvanized iron wires, and then the galvanized iron sheet is tightly fixed on the outer surface by using self-tapping screws.
5. The system for reducing the discharge amount of the sulfides in the exhaust gas of the kiln tail wind-taking coal mill according to claim 4, characterized in that pre-rolling nipples are used for connecting each galvanized iron sheet in the longitudinal direction and the transverse direction, the heat-insulating materials are required to be arranged in a staggered manner tightly attached to the outer surface of the circulating air pipe, and no gap is left at the joint of each heat-insulating material.
6. The system for reducing the discharge amount of the sulfides in the exhaust gas of the kiln tail air-taking coal mill according to claim 4, wherein the construction mode of the heat insulation structure comprises the following specific steps:
(1) cleaning up stains on the outer surface of the circulating air pipe before construction, welding the V-shaped steel bars on the outer surface of the circulating air pipe at intervals of 350mm, and brushing anti-rust paint on welding spots after removing welding slag;
(2) welding a circle of supporting rings made of flat steel on the outer surface of the vertical and inclined pipelines with the outer diameter larger than 800mm at intervals of 3-4m, wherein the width of each supporting ring is 3/4 made of heat-insulating materials, and the thickness of each supporting ring is 5 mm;
(3) taking the lower end of the curved surface of the circulating air pipe as a reference, paving and fixing heat insulation materials from bottom to top for a circle, or taking the flange connecting part of the circulating air pipe as a reference, paving and fixing heat insulation materials from one end to the other end for a circle, wherein the longitudinal and transverse seams are staggered when the heat insulation materials are spliced, the butt joint is tight, and sealing cement or scattered heat insulation materials are filled in the gaps;
(4) bundling the heat-insulating material layer by using glass cloth, and then bundling and fixing by using galvanized iron wires;
(5) cutting the outer protective material according to the actual using amount of the pipeline; then laying the external protective material outside the thermal insulation material by using self-tapping screws; when the composite material is laid, the upper part of a curved surface is taken as a reference, two adjacent external protective materials are connected by adopting a telescopic undercut method in the horizontal direction and are connected by adopting a common undercut method in the vertical direction, or a flange connecting part is taken as a reference, the two adjacent external protective materials are connected by adopting the common undercut method in the circumferential direction and are connected by adopting the telescopic undercut method in the axial direction, and the circumferential joint of the bent part is formed by rolling and covers more than 25 mm; the adjacent external protective materials are tightly butted, and if a gap exists, the gap is blocked by sealing cement.
CN202010747144.9A 2020-07-29 2020-07-29 Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill Pending CN111854453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010747144.9A CN111854453A (en) 2020-07-29 2020-07-29 Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010747144.9A CN111854453A (en) 2020-07-29 2020-07-29 Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill

Publications (1)

Publication Number Publication Date
CN111854453A true CN111854453A (en) 2020-10-30

Family

ID=72945110

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010747144.9A Pending CN111854453A (en) 2020-07-29 2020-07-29 Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill

Country Status (1)

Country Link
CN (1) CN111854453A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203333483U (en) * 2013-06-27 2013-12-11 内蒙古蒙西水泥股份有限公司 Cement pulverized coal preparation system
CN104326688A (en) * 2014-09-28 2015-02-04 海拉尔蒙西水泥有限公司 System and method for calcining cement clinker through lignite safely in large amount
CN206131034U (en) * 2016-09-30 2017-04-26 福建永恒能源管理有限公司 Pulverized coal preparation device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203333483U (en) * 2013-06-27 2013-12-11 内蒙古蒙西水泥股份有限公司 Cement pulverized coal preparation system
CN104326688A (en) * 2014-09-28 2015-02-04 海拉尔蒙西水泥有限公司 System and method for calcining cement clinker through lignite safely in large amount
CN206131034U (en) * 2016-09-30 2017-04-26 福建永恒能源管理有限公司 Pulverized coal preparation device

Similar Documents

Publication Publication Date Title
US9945556B2 (en) Fossil-fuel power generation system assisted by waste incineration
CN201748770U (en) Brown coal drying and quality-improving system
CN201534101U (en) Bowel-type medium speed coal mill
CN103862565A (en) Large-sized paper-surface gypsum board production process with annual yield of 60,000,000 square meters and production line thereof
CN105180175B (en) A kind of fluidized bed refuse incinerator dreg removing system and Slagoff method
CN203726617U (en) Large-sized gypsum plasterboard production line with 60,000,000m<2> yearly output
CN209263063U (en) A kind of novel soot blower system for station boiler horizontal flue
CN109269308B (en) A kind of shaft cooler and method using sintering flue gas and sinter heat exchange
CN114606358A (en) Steelmaking converter flue gas waste heat recovery and dry dedusting system
CN111854453A (en) Method and system for reducing discharge amount of sulfide in waste gas of kiln tail air-taking coal mill
CN213387827U (en) Raw material diversified active coke internal heating type rotary furnace
CN104089296B (en) Integrate powder process storage powder for the rotary-type pulverized coal combustion system of powder and temperature controllable
CN112610975A (en) Improved medium-speed mill system and pulverizing method
CN111256112A (en) Continuous feeding system suitable for direct blending burning of wet sludge of circulating fluidized bed boiler
CN214619657U (en) Improved medium-speed mill system
CN105836810A (en) Acid regeneration station ferric oxide powder cooling treatment system
US10001277B2 (en) Method for conveying impurities in pressurized fluidized bed incinerator system
CN212915933U (en) Novel coal mill device for taking air from kiln tail
CN207471566U (en) Biomass combustion boiler nozzle and ashes cooling system
CN213578485U (en) Coal drying, dedusting and feeding system utilizing flue gas for heating
CN206646075U (en) A kind of gas-carbon cogeneration top-suction type biomass gasification furnace
CN117146601B (en) Rapid cooling and waste heat on-line recovery device for high-temperature materials and application method thereof
CN200955902Y (en) Internal-external heating industrial shaft kiln using cold gas or hot gas
CN106574310A (en) Blast furnace plant
CN107726349A (en) Biomass combustion boiler nozzle and ashes cooling system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination