CN109160756B - Method and system for producing cement by separating waste - Google Patents

Method and system for producing cement by separating waste Download PDF

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Publication number
CN109160756B
CN109160756B CN201811344211.1A CN201811344211A CN109160756B CN 109160756 B CN109160756 B CN 109160756B CN 201811344211 A CN201811344211 A CN 201811344211A CN 109160756 B CN109160756 B CN 109160756B
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Prior art keywords
waste
undersize
communicated
flue gas
temperature
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CN109160756A (en
Inventor
刘海兵
田大春
顾军
刘卫民
张永利
张齐
韩力
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Zanhuang Jinyu Cement Co ltd
Beijing Building Materials Academy of Sciences Research
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Zanhuang Jinyu Cement Co ltd
Beijing Building Materials Academy of Sciences Research
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a method and a system for cement production by separating waste materials. The method comprises the steps of firstly separating the waste into large-particle waste and small-particle waste, then separating high-temperature smoke and inorganic ash from the large-particle waste through heating gasification, then sending the high-temperature smoke into a decomposing furnace, and sending the inorganic ash into a batching system for cement kiln raw materials. The system comprises a screening machine, a feeding port of the screening machine is communicated with a waste collection room, a first discharging port of the screening machine is communicated with a feeding port of a gasifier, an air outlet of the gasifier is communicated with a high-temperature flue gas inlet of a decomposing furnace, a discharging port of the gasifier is communicated with a feeding port of a batching system, and a second discharging port of the screening machine is communicated with a feeding port of the decomposing furnace. The invention avoids the direct connection of the household garbage into the kiln due to the factors of high moisture, low heat value, uneven particle size and the like by the cold and hot dual-quality separation of the household garbage outside the kiln, and can fully burn dioxin.

Description

Method and system for producing cement by separating waste
Technical Field
The invention relates to a waste disposal method and a system thereof, in particular to a method and a system for cement production after waste is classified.
Background
With the rapid development of town and the increasing of the living standard of people, urban waste in China, such as: domestic waste and municipal sludge are rapidly growing. The disposal of these wastes has become an important issue limiting the development of urban sustainability. Because the household garbage has complex components, low heat value and high moisture, the improper treatment can cause secondary pollution. The existing domestic garbage and sludge treatment technology mainly comprises several modes of landfill, composting, incineration, power generation and the like, but terminal disposal is difficult to realize, and secondary pollution exists in different degrees. In particular to garbage sorting, the common cold sorting is difficult to ensure the sorting quality, and organic matters and inorganic matters are doped, so that the subsequent recycling treatment is hindered. Sludge drying is difficult to realize efficient recycling treatment due to the problems of heat source, waste gas collection and the like.
The cement industry has gained international acceptance for the function of disposing waste, since the inorganic main chemical components of the waste comprise SiO 2 、Fe 2 0 3 And A1 2 O 3 In comparison with siliceous materials in cement materials, the cement materials can be used for partially replacing siliceous materials for batching in theory, and the calorific value of the cement materials can be used as fuel. However, due to the factors of moisture, heat value and the like of the garbage, the garbage is directly connected into a kiln for disposal, and the influence on the operation of the cement kiln is large.
Specifically, the prior art has resulted in waste being directly fed into the kiln, such as: the household garbage cannot realize the large-batch disposal of wastes and cannot achieve the purpose of saving energy because of adverse effects of cement kiln operation conditions caused by factors such as high moisture, low heat value, uneven particle size and the like. The dioxin in the garbage can not be completely burnt.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a method for cement production after separating waste, by which waste can be avoided, such as: the household garbage is adversely affected by the running condition of the cement kiln caused by the factors of high moisture, low heat value, uneven particle size and the like, so that the waste can be treated in a large scale, and the aim of saving energy is fulfilled.
The second technical problem to be solved by the invention is to provide a system for cement production after separating waste, which can avoid waste, such as: the household garbage is adversely affected by the running condition of the cement kiln caused by the factors of high moisture, low heat value, uneven particle size and the like, so that the waste can be treated in a large scale, and the aim of saving energy is fulfilled.
In order to solve the first technical problem, the invention provides a method for cement production after separating waste into large-particle waste and small-particle waste, separating high-temperature flue gas and inorganic ash by heating and gasifying the large-particle waste, then sending the high-temperature flue gas into a decomposing furnace, and sending the inorganic ash into a batching system for cement kiln raw materials.
The waste comprises municipal primary household waste, and/or stale waste.
The large particle waste is high calorific value large particle waste.
The small particle waste is low calorific value small particle waste.
The waste is crushed before being separated into large-particle waste and small-particle waste.
The waste is crushed by a crusher.
The waste is sent to the crusher from the waste collection room through the grab bucket and the first plate type feeding machine in sequence.
The crushed waste is sent into a sieving machine from a crusher through a belt conveyor.
The maximum size of the crushed large-particle waste is less than or equal to 200mm, and the minimum size is greater than or equal to 30mm.
The maximum size of the crushed small particle waste is less than 30mm.
The waste is separated by a sieving machine.
The large particle waste after sieving is the oversize material.
The small particle waste after sieving is undersize.
The high-temperature flue gas and the inorganic ash are separated from the oversize material by heating and gasifying through a gasifier.
The inorganic ash is sent into a slag remover for water cooling.
And fishing out the inorganic ash after water cooling.
The fished inorganic ash is sent into a batching system through a first plate link chain conveyor.
The oversize material is sent into the gasification furnace from the sieving machine through the second plate type feeding machine.
The odor in the waste collection room is used as primary air for gasification and incineration to incinerate the oversize materials.
The odor is sent into the gasification furnace from the waste collection room through the odor adjusting and controlling device.
The redundant odor is introduced into a high-temperature section of the cement kiln grate cooler through an odor adjusting and controlling device to be burnt as primary air.
The odor is introduced into the emergency deodorizing system in an emergency situation.
And (3) sending high-temperature flue gas generated by burning the oversize materials into a high-temperature flue gas inlet of the decomposing furnace.
The temperature of the high-temperature flue gas at the gas outlet of the gasification furnace is 800-1000 ℃.
The temperature of the high-temperature flue gas at the gas outlet of the gasification furnace is regulated and controlled by the primary air quantity and the garbage feeding quantity.
The undersize is stored in a movable bottom stock bin.
The undersize is sent into the movable bottom bin from the screening machine through a second plate link chain conveyor.
The undersize material is sent to a third plate chain conveyor or a scattering dryer from a movable bottom bin through a quantitative feeder and an electric three-way valve in sequence.
The water content of the undersize in the movable bottom bin is detected by a water content analyzer.
And the moisture analyzer controls the electric three-way valve to send the undersize to the third plate chain conveyor or the scattering dryer according to the moisture detection result of the undersize.
The undersize material includes dry undersize material and wet undersize material.
The moisture of the dry undersize is less than 30%.
The moisture of the wet undersize is greater than or equal to 30%.
The dry undersize is directly sent into a cement kiln for burning.
The dry screen lower material is sent into a feed inlet of the decomposing furnace through a third plate link chain conveyor, a bucket elevator and a locking air valve in sequence.
The wet undersize material is dried to form a dried undersize material, and the dried undersize material is sent into a cement kiln for burning.
The wet undersize is dried by a scattering dryer.
The wet undersize product stays in the scattering dryer for 30-45 minutes.
The wet undersize material is dried by the high-temperature flue gas generated after the oversize material is incinerated.
The high temperature flue gas temperature for drying wet undersize is 700-800 ℃.
The high-temperature flue gas temperature for drying wet undersize is regulated by the air odor, so as to control the drying temperature of the undersize.
The moisture content of the undersize after drying is 20-30%.
The screen lower materials after drying are sequentially sent into a feed inlet of the decomposing furnace through a third plate link chain conveyor, a bucket elevator and a locking air valve.
And the wet screen lower material is sent to a high-temperature steam inlet and/or a high-temperature flue gas inlet of a decomposing furnace through high-temperature steam generated after drying by a scattering dryer.
The high-temperature water vapor and the high-temperature flue gas are mixed and then enter a high-temperature flue gas inlet of the decomposing furnace.
Percolate in the waste collection room is sent to a liquid inlet of the decomposing furnace and/or a kiln head cover.
The percolate is pumped into a liquid inlet of the decomposing furnace and/or a kiln head cover through a centrifugal pump.
Compared with the prior art, the method for producing cement by separating waste materials has the following beneficial effects.
1. According to the technical scheme, the waste is firstly separated into the large-particle waste and the small-particle waste, then the large-particle waste is heated and gasified to separate high-temperature smoke and inorganic ash, and then the high-temperature smoke is sent to the decomposing furnace, and the inorganic ash is sent to the batching system to be used as raw materials of the cement kiln, so that the direct access of household garbage into the kiln due to factors such as high moisture, low heat value and uneven particle size and the like is avoided through the cold and hot dual-quality of the living garbage outside the kiln, the adverse influence of the running condition of the cement kiln caused by the fact that the household garbage is high in moisture, low in heat value and uneven in particle size is realized, the waste is treated in a large batch, and the purpose of saving energy is achieved. Thoroughly incinerating dioxin in garbage. Due to the characteristics of high temperature, alkalinity, long residence time and the like of the cement kiln, dioxin can be fully burnt.
2. The technical scheme adopts the technical means that the wastes comprise urban primary household garbage and/or stale garbage, so that the method is beneficial to the quality-classifying treatment of various wastes.
3. The technical proposal adopts the large-particle waste as the high-heat-value large-particle waste; the small particle waste is low-heat value small particle waste; crushing the waste before separating the waste into large-particle waste and small-particle waste; the waste is crushed by the crusher, so that the efficiency and quality of the quality-dividing treatment can be greatly improved.
4. According to the technical scheme, the waste is sent into the crusher from the waste collection room through the grab bucket and the first plate type feeding machine in sequence. The crushed waste is sent from the crusher to the sieving machine through the belt conveyor, so that the control of the conveying of the waste is facilitated.
5. According to the technical scheme, the maximum size of the crushed large-particle waste is less than or equal to 200mm, and the minimum size is greater than or equal to 30mm; the maximum size of the crushed small particle waste is less than 30mm, so the quality-classifying treatment has extremely high efficiency and excellent quality.
6. According to the technical scheme, the waste is separated by a screening machine; the large-particle waste after sieving is the oversize material; the small particle waste after sieving is undersize; the oversize material is heated and gasified by a gasification furnace to separate high-temperature flue gas and inorganic ash; feeding the inorganic ash slag into a slag remover for water cooling; fishing out the inorganic ash after water cooling; the inorganic ash is sent into the batching system through the first plate chain conveyor, so the inorganic ash can be used as raw material for producing cement.
7. According to the technical scheme, the technical means that the oversize materials are sent into the gasification furnace from the screening machine through the second plate type feeding machine is adopted, so that the conveying of the oversize materials is favorably controlled.
8. The technical proposal adopts the odor in the waste collection room as the technical means of burning the oversize materials by the primary air of gasification burning, thereby not only greatly purifying the air in the waste collection room and changing the odor into valuable substances to be utilized, but also eliminating the odor in the odor and being beneficial to further saving energy.
9. The technical proposal adopts the technical means that the odor is sent into the gasification furnace from the waste collection room through the odor adjusting and controlling device, thereby being beneficial to adjusting and controlling the transportation of the odor.
10. The technical proposal adopts the technical means that the redundant odor is introduced into the high temperature section of the grate cooler of the cement kiln through the odor adjusting and controlling device as primary air combustion, thereby being beneficial to fully utilizing the odor.
11. According to the technical scheme, the technical means of introducing the odor into the emergency deodorization system under the emergency condition is adopted, so that the safety of odor utilization can be improved.
12. According to the technical scheme, the technical means that the high-temperature flue gas generated by burning the oversize products is sent to the high-temperature flue gas inlet of the decomposing furnace is adopted, so that the cement raw material can be heated by the high-temperature flue gas generated by burning the oversize products, and the energy can be further saved.
13. The technical proposal adopts the technical means that the temperature of the high-temperature flue gas at the gas outlet of the gasification furnace is 800-1000 ℃, so the high-temperature flue gas can meet the requirement of heating cement raw materials.
14. According to the technical scheme, the temperature of the high-temperature flue gas at the air outlet of the gasification furnace is regulated and controlled by the primary air quantity and the garbage feeding quantity, so that the high-temperature flue gas can be ensured to meet the requirement on heating the cement raw material.
15. The technical scheme is that the undersize is firstly stored in the movable bottom bin; the undersize material is sent into the technical means of the movable bottom bin from the screening machine through the second plate chain conveyor, so that the undersize material conveying control is facilitated.
16. According to the technical scheme, the undersize materials are sequentially sent to a third plate chain conveyor or a scattering dryer from a movable bottom bin through a quantitative feeder and an electric three-way valve; detecting the moisture of the undersize in the movable bottom bin through a moisture analyzer; the moisture analyzer controls the electric three-way valve to send the undersize to a third plate chain conveyor or a scattering dryer according to the moisture detection result of the undersize; the undersize material comprises dry undersize material and wet undersize material; the moisture of the dry undersize is less than 30%; the moisture of the wet-like undersize is greater than or equal to 30%; directly feeding the dry undersize into a cement kiln for incineration; the dry undersize material is sequentially sent to a feed inlet of the decomposing furnace through a third plate link chain conveyor, a bucket elevator and a locking air valve; the wet undersize material is dried to form a dried undersize material, and the dried undersize material is sent into a cement kiln for burning, so that the undersize material is favorable for fully burning after entering the cement kiln.
17. According to the technical scheme, wet undersize materials are dried by a scattering dryer; the wet undersize material stays in the scattering dryer for 30-45 minutes, so that the wet undersize material can be fully dried.
18. According to the technical scheme, the wet undersize material is dried by high-temperature flue gas generated after the undersize material is incinerated; the high temperature flue gas temperature for drying wet-shaped undersize products is 700-800 ℃, so the drying of the wet-shaped undersize products is facilitated.
19. According to the technical scheme, the technical means that the temperature of high-temperature flue gas for drying wet undersize is adjusted through the air odor amount, so that the drying temperature of the undersize is controlled, and the wet undersize can be dried.
20. The technical proposal adopts the technical means that the water content of the screen underflows after drying is 20-30 percent, so that the screen underflows can be ensured to be fully burnt after entering a cement kiln.
21. According to the technical scheme, the technical means that the dried screen lower materials are sequentially conveyed into the feed inlet of the decomposing furnace through the third plate link chain conveyor, the bucket elevator and the air locking valve is adopted, so that the conveying control of the dried screen lower materials is facilitated.
22. According to the technical scheme, the technical means that the high-temperature steam generated after the wet screen lower is dried by the scattering dryer is sent to the high-temperature steam inlet and/or the high-temperature flue gas inlet of the decomposing furnace is adopted, so that the generated high-temperature steam can enter a high-temperature area at the bottom of the decomposing furnace and serve as a gasifying agent of fuel coal to burn at low nitrogen.
23. According to the technical scheme, the high-temperature steam and the high-temperature flue gas are mixed and then enter the high-temperature flue gas inlet of the decomposing furnace, so that the low-nitrogen combustion is more facilitated by taking the high-temperature steam as the gasifying agent of the fuel coal.
24. According to the technical scheme, due to the adoption of the technical means that percolate in the waste collection room is sent into the liquid inlet of the decomposing furnace and/or the kiln head cover, ammonia nitrogen substances are contained in the percolate, so that the waste collection room is cleaned, the purpose of reducing the generation of nitrogen oxides can be achieved by the percolate, and low-nitrogen combustion is achieved.
25. The technical proposal adopts the technical means that the percolate is pumped into the liquid inlet of the decomposing furnace and/or the kiln head cover by the centrifugal pump, so the equipment is simple, and the cost of waste disposal is reduced.
In order to solve the second technical problem, the invention provides a system for cement production after separating waste, which comprises a screening machine, wherein a feed inlet of the screening machine is communicated with a waste collection room, a first discharge outlet of the screening machine is communicated with a feed inlet of a gasification furnace, an air outlet of the gasification furnace is communicated with a high-temperature flue gas inlet of a decomposing furnace, a discharge outlet of the gasification furnace is communicated with a feed inlet of a batching system, and a second discharge outlet of the screening machine is communicated with a feed inlet of the decomposing furnace.
The first discharge port of the screening machine is communicated with the feed port of the gasification furnace through a second plate type feeding machine.
The first discharge port of the screening machine is communicated with the feed inlet of the second plate type feeding machine.
And a discharge hole of the second plate type feeder is communicated with a feed inlet of the gasification furnace.
The discharge port of the gasification furnace is communicated with the feed port of the batching system through a slag remover and a first plate link chain conveyor in sequence.
The discharge port of the gasification furnace is communicated with the feed port of the slag remover.
And a discharge hole of the slag remover is communicated with a feed hole of the first plate link chain conveyor.
And a discharge hole of the first plate link chain conveyor is communicated with a feed inlet of the batching system.
And a second discharge hole of the screening machine is communicated with a feed inlet of the movable bottom bin.
And a discharge hole of the movable bottom bin is communicated with a feed inlet of the quantitative feeder.
And a discharge port of the quantitative feeder is communicated with a feed port of the electric three-way valve.
And a moisture analyzer is arranged between the electric three-way valve and the movable bottom bin.
The moisture analyzer is connected with a moisture content sensing component.
The moisture content sensing component is arranged in the movable bottom bin.
The moisture content sensing component is arranged at the bottom of the movable bottom bin.
The control signal output end of the moisture analyzer is electrically connected with the control signal input end of the electric three-way valve.
And the first discharge port of the electric three-way valve is communicated with the feed inlet of the third plate link chain conveyor.
And a discharge hole of the third plate link chain conveyor is communicated with a feed hole of the bucket elevator.
And a discharge hole of the bucket elevator is communicated with a feed hole of the air locking valve.
And a discharge hole of the air locking valve is communicated with a feed inlet of the decomposing furnace.
And a second discharge port of the electric three-way valve is communicated with a feed inlet of the scattering dryer.
And a discharge hole of the scattering dryer is communicated with a feed inlet of the third plate link chain conveyor.
The high-temperature flue gas inlet of the scattering dryer is communicated with the high-temperature flue gas outlet of the gasifier.
The high-temperature steam outlet of the scattering dryer is communicated with the high-temperature steam inlet of the decomposing furnace and/or the high-temperature flue gas inlet of the decomposing furnace.
And a feeding port of the screening machine is communicated with a discharging port of the belt conveyor.
And a feeding port of the belt conveyor is communicated with a discharging port of the crusher.
The feeding port of the crusher is communicated with the discharging port of the first plate type feeding machine.
A grab bucket is arranged between the feeding port of the first plate type feeding machine and the waste collection room.
The air outlet of the waste collection room is communicated with the air inlet of the odor adjusting and controlling device.
The first air outlet of the odor adjusting and controlling device is communicated with the air inlet of the gasification furnace.
And a second air outlet of the odor adjusting and controlling device is communicated with a high-temperature area of the grate cooler.
The second air outlet of the odor adjusting and controlling device is communicated with the air inlet of the emergency deodorizing system.
The liquid outlet of the waste collection room is communicated with the liquid inlet of the centrifugal pump.
The liquid outlet of the centrifugal pump is communicated with the liquid inlet of the decomposing furnace.
The liquid outlet of the centrifugal pump is communicated with the liquid inlet of the kiln head cover.
The grate cooler is communicated with the kiln head of the rotary kiln through the kiln head cover.
And the kiln tail of the rotary kiln is communicated with the lower end of the decomposing furnace.
Compared with the prior art, the system for producing cement by separating waste materials has the following beneficial effects.
1. According to the technical scheme, the feeding port of the screening machine is communicated with the waste collection room, the first discharging port of the screening machine is communicated with the feeding port of the gasifier, the air outlet of the gasifier is communicated with the high-temperature flue gas inlet of the decomposing furnace, the discharging port of the gasifier is communicated with the feeding port of the batching system, and the second discharging port of the screening machine is communicated with the feeding port of the decomposing furnace, so that the aim of saving energy sources is fulfilled by directly feeding household garbage into the kiln due to factors such as high moisture, low heat value and uneven particle size of the household garbage through cold and hot dual-mass separation of the household garbage. Thoroughly incinerating dioxin in garbage. Due to the characteristics of high temperature, alkalinity, long residence time and the like of the cement kiln, dioxin can be fully burnt.
2. According to the technical scheme, the first discharge port of the screening machine is communicated with the feed port of the gasification furnace through the second plate type feeding machine; the first discharge port of the screening machine is communicated with the feed port of the second plate type feeding machine; the discharge port of the second plate type feeder is communicated with the feed port of the gasification furnace; the discharge port of the gasification furnace is communicated with the feed port of the batching system sequentially through a slag remover and a first plate link chain conveyor; the discharge port of the gasification furnace is communicated with the feed port of the slag remover; the discharge port of the slag remover is communicated with the feed port of the first plate link chain conveyor; the discharge port of the first plate link chain conveyor is communicated with the feed port of the batching system, so that inorganic ash slag generated by burning the oversize material can be used for producing raw materials of cement, and high-temperature flue gas generated by burning the oversize material can be used for heating and treating the raw materials of cement, thereby further saving energy.
3. According to the technical scheme, the second discharge port of the screening machine is communicated with the feed port of the movable bottom bin; the discharge port of the movable bottom bin is communicated with the feed port of the quantitative feeder; the discharge port of the quantitative feeder is communicated with the feed port of the electric three-way valve; a moisture analyzer is arranged between the electric three-way valve and the movable bottom bin; the moisture analyzer is connected with a moisture content sensing component; the moisture content sensing component is arranged in the movable bottom bin; the moisture content sensing component is arranged at the bottom of the movable bottom bin; the control signal output end of the moisture analyzer is electrically connected with the control signal input end of the electric three-way valve; the first discharge port of the electric three-way valve is communicated with the feed port of the third plate link chain conveyor; the discharge port of the third plate link chain conveyor is communicated with the feed port of the bucket elevator; the discharge port of the bucket elevator is communicated with the feed port of the air locking valve; the discharge port of the air locking valve is communicated with the feed port of the decomposing furnace; the second discharge port of the electric three-way valve is communicated with the feed inlet of the scattering dryer; the discharge port of the scattering dryer is communicated with the feed port of the third plate link chain conveyor; the high-temperature flue gas inlet of the scattering dryer is communicated with the high-temperature flue gas outlet of the gasifier; the high-temperature steam outlet of the scattering dryer is communicated with the high-temperature steam inlet of the decomposing furnace and/or communicated with the high-temperature flue gas inlet of the decomposing furnace, so that the dry screen underflows and the dry screen underflows can be used for fully burning cement raw materials, and the high-temperature steam generated after the wet screen underflows are dried can enter a high-temperature area at the bottom of the decomposing furnace and serve as a gasifying agent of fuel coal to burn low nitrogen.
4. According to the technical scheme, the feeding port of the screening machine is communicated with the discharging port of the belt conveyor; the feeding port of the belt conveyor is communicated with the discharging port of the crusher; the feeding port of the crusher is communicated with the discharging port of the first plate type feeding machine; the technical means of the grab bucket is arranged between the feeding port of the first plate type feeding machine and the waste collection room, so that the waste can be crushed, and the conveying control of the waste is facilitated.
5. The technical proposal adopts the air outlet of the waste collection room to be communicated with the air inlet of the odor adjusting and controlling device; the first air outlet of the odor adjusting and controlling device is communicated with the air inlet of the gasification furnace; the second air outlet of the odor adjusting and controlling device is communicated with a high-temperature area of the grate cooler; the second air outlet of the odor adjusting and controlling device is communicated with the air inlet of the emergency deodorizing system, so that the air in the waste collection room can be greatly purified, the odor is turned into wealth to be utilized, and meanwhile, the odor in the odor is eliminated, and the energy is further saved.
6. According to the technical scheme, a liquid outlet of the waste collection room is communicated with a liquid inlet of the centrifugal pump; the liquid outlet of the centrifugal pump is communicated with the liquid inlet of the decomposing furnace; the liquid outlet of the centrifugal pump is communicated with the liquid inlet of the kiln head cover; the grate cooler is communicated with the kiln head of the rotary kiln through the kiln head cover; the kiln tail of the rotary kiln is communicated with the lower end of the decomposing furnace, so that the rotary kiln is beneficial to cleaning a waste collection room, and the percolate can achieve the purpose of reducing the generation of nitrogen oxides and realize low-nitrogen combustion.
Drawings
The method and system for cement production after waste is classified according to the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic diagram of the working process and connection structure of the method and system for cement production after separating waste materials according to the present invention.
Description of the embodiments
As shown in fig. 1, the present embodiment provides a method for cement production after separating waste into large-particle waste and small-particle waste, separating the large-particle waste into high-temperature flue gas and inorganic ash by heating gasification, then sending the high-temperature flue gas into a decomposing furnace 21, and sending the inorganic ash into a batching system 11 for cement kiln raw materials.
According to the embodiment, the technical means that the waste is firstly separated into the large-particle waste and the small-particle waste, then the large-particle waste is heated and gasified to separate high-temperature smoke and inorganic ash, and then the high-temperature smoke is sent into the decomposing furnace, and the inorganic ash is sent into the batching system to be used as the raw material of the cement kiln is adopted, so that the direct connection of household garbage into the kiln due to factors such as high moisture, low heat value, uneven particle size and the like is avoided through the cold and hot dual-quality of the living garbage outside the kiln, the adverse influence of the running condition of the cement kiln caused by the fact that the household garbage is high in moisture, low in heat value and uneven in particle size is realized, the waste is treated in a large batch, and the purpose of saving energy is achieved. Thoroughly incinerating dioxin in garbage. Due to the characteristics of high temperature, alkalinity, long residence time and the like of the cement kiln, dioxin can be fully burnt.
Various modifications of the present embodiment are described in detail below.
The waste comprises municipal primary household waste, and/or stale waste.
The method is beneficial to the quality-classifying treatment of various wastes due to the adoption of the technical means that the wastes comprise urban primary household garbage and/or stale garbage.
The large particle waste is high calorific value large particle waste.
The small particle waste is low calorific value small particle waste.
The waste is crushed before being separated into large-particle waste and small-particle waste.
The waste is crushed by the crusher 4.
In the embodiment, the large-particle waste is high-heat-value large-particle waste; the small particle waste is low-heat value small particle waste; crushing the waste before separating the waste into large-particle waste and small-particle waste; the waste is crushed by the crusher, so that the efficiency and quality of the quality-dividing treatment can be greatly improved.
The waste is fed from the waste collection room 1 to the crusher 4 via the grab 2 and the first plate feeder 3 in sequence.
The crushed waste is sent from the crusher 4 to the sieving machine 6 by the belt conveyor 5.
In the embodiment, the waste is sent to the crusher from the waste collection room through the grab bucket and the first plate type feeding machine in sequence. The crushed waste is sent from the crusher to the sieving machine through the belt conveyor, so that the control of the conveying of the waste is facilitated.
The maximum size of the crushed large-particle waste is less than or equal to 200mm, and the minimum size is greater than or equal to 30mm.
The maximum size of the crushed small particle waste is less than 30mm.
In the embodiment, the maximum size of the crushed large-particle waste is less than or equal to 200mm, and the minimum size is greater than or equal to 30mm; the maximum size of the crushed small particle waste is less than 30mm, so the quality-classifying treatment has extremely high efficiency and excellent quality.
The waste is separated by a screening machine 6.
The large particle waste after sieving is the oversize material.
The small particle waste after sieving is undersize.
The oversize material is heated and gasified by a gasifier 8 to separate high-temperature flue gas and inorganic ash.
The inorganic ash is sent to a slag remover 9 for water cooling.
And fishing out the inorganic ash after water cooling.
The fished-out inorganic ash is sent to the batching system 11 through the first plate link chain conveyor 10.
In the embodiment, the waste is separated by a screening machine; the large-particle waste after sieving is the oversize material; the small particle waste after sieving is undersize; the oversize material is heated and gasified by a gasification furnace to separate high-temperature flue gas and inorganic ash; feeding the inorganic ash slag into a slag remover for water cooling; fishing out the inorganic ash after water cooling; the inorganic ash is sent into the batching system through the first plate chain conveyor, so the inorganic ash can be used as raw material for producing cement.
The oversize is fed from the screening machine 6 to the gasifier 8 via a second plate feeder 7.
In the embodiment, the technical means that the oversize material is sent into the gasification furnace from the screening machine through the second plate type feeding machine is adopted, so that the conveying control of the oversize material is facilitated.
The odor in the waste collection room 1 is used as primary air for gasification and incineration to incinerate the oversize products.
The present embodiment adopts the technical means that the odor in the waste collection room is used as the primary air of gasification incineration to incinerate the oversize products, so that the air in the waste collection room can be greatly purified, the odor is turned into wealth and utilized, and meanwhile, the odor in the odor is eliminated, thereby being beneficial to further saving energy.
The odor is sent from the waste collection room 1 to the gasification furnace 8 through the odor adjusting and controlling device 26.
In this embodiment, the technical means that the odor is fed into the gasification furnace from the waste collection room through the odor adjusting and controlling device is adopted, so that the adjustment and control of the delivery of the odor are facilitated.
The extra odor is introduced into the high temperature section of the cement kiln grate cooler 24 through the odor adjusting and controlling device 26 to burn as primary air.
The method adopts the technical means that the extra odor is introduced into the high-temperature section of the cement kiln grate cooler through the odor adjusting and controlling device as primary air combustion, so that the method is beneficial to fully utilizing the odor.
The malodor is introduced into the emergency deodorizing system 27 in an emergency situation.
In the present embodiment, the technical means for introducing the odor into the emergency deodorizing system in an emergency is adopted, so that the safety of the utilization of the odor can be improved.
The high temperature flue gas generated by burning the oversize material is sent to the high temperature flue gas inlet of the decomposing furnace 21.
In the embodiment, the technical means that the high-temperature flue gas generated by burning the oversize products is sent to the high-temperature flue gas inlet of the decomposing furnace is adopted, so that the cement raw material can be heated by the high-temperature flue gas generated by burning the oversize products, and the energy can be further saved.
The temperature of the high-temperature flue gas at the air outlet of the gasification furnace 8 is 800-1000 ℃.
In the embodiment, the high-temperature flue gas at the gas outlet of the gasification furnace is 800-1000 ℃ in technical means, so that the high-temperature flue gas can meet the requirement of heating cement raw materials.
The temperature of the high-temperature flue gas at the air outlet of the gasification furnace 8 is regulated and controlled by the primary air quantity and the garbage feeding quantity.
In the embodiment, the temperature of the high-temperature flue gas at the air outlet of the gasification furnace is regulated and controlled by the primary air quantity and the garbage feeding quantity, so that the high-temperature flue gas can be ensured to meet the requirement of heating the cement raw material.
The undersize is stored in the movable bottom stock bin 13.
Undersize is fed from the screening machine 6 to a false bottom silo 13 by a second plate link chain conveyor 12.
In the embodiment, the undersize is firstly stored in the movable bottom bin; the undersize material is sent into the technical means of the movable bottom bin from the screening machine through the second plate chain conveyor, so that the undersize material conveying control is facilitated.
The undersize is fed from the false bottom bin 13 to a third plate chain conveyor 17 or a break-up dryer 18 sequentially through a dosing machine 14 and an electric three-way valve 15.
The moisture of the undersize in the movable bottom silo 13 is detected by a moisture analyzer 16.
The moisture analyzer 16 controls the electric three-way valve 15 to feed the undersize product to the third plate link chain conveyor 17 or the break-up dryer 18 according to the moisture detection result of the undersize product.
The undersize material includes dry undersize material and wet undersize material.
The moisture of the dry undersize is less than 30%.
The moisture of the wet undersize is greater than or equal to 30%.
The dry undersize is directly sent into a cement kiln for burning.
The dry undersize material is sent to a feed inlet of a decomposing furnace 21 through a third plate link chain conveyor 17, a bucket elevator 19 and a locking air valve 20 in sequence.
The wet undersize material is dried to form a dried undersize material, and the dried undersize material is sent into a cement kiln for burning.
In the embodiment, the undersize materials are sequentially sent to a third plate chain conveyor or a scattering dryer from a movable bottom bin through a quantitative feeder and an electric three-way valve; detecting the moisture of the undersize in the movable bottom bin through a moisture analyzer; the moisture analyzer controls the electric three-way valve to send the undersize to a third plate chain conveyor or a scattering dryer according to the moisture detection result of the undersize; the undersize material comprises dry undersize material and wet undersize material; the moisture of the dry undersize is less than 30%; the moisture of the wet-like undersize is greater than or equal to 30%; directly feeding the dry undersize into a cement kiln for incineration; the dry undersize material is sequentially sent to a feed inlet of the decomposing furnace through a third plate link chain conveyor, a bucket elevator and a locking air valve; the wet undersize material is dried to form a dried undersize material, and the dried undersize material is sent into a cement kiln for burning, so that the undersize material is favorable for fully burning after entering the cement kiln.
The wet undersize is dried by a breaker dryer 18.
The wet undersize stays in the break-up dryer 18 for 30-45 minutes.
In the embodiment, wet undersize is adopted and dried by a scattering dryer; the wet undersize material stays in the scattering dryer for 30-45 minutes, so that the wet undersize material can be fully dried.
The wet undersize material is dried by the high-temperature flue gas generated after the oversize material is incinerated.
The high temperature flue gas temperature for drying wet undersize is 700-800 ℃.
In the embodiment, the wet undersize is used for drying the high-temperature flue gas generated after the undersize is incinerated; the high temperature flue gas temperature for drying wet-shaped undersize products is 700-800 ℃, so the drying of the wet-shaped undersize products is facilitated.
The high-temperature flue gas temperature for drying wet undersize is regulated by the air odor, so as to control the drying temperature of the undersize.
In this embodiment, the high-temperature flue gas temperature for drying wet undersize products is adjusted by the amount of odor, and the drying temperature of the undersize products is controlled, so that the wet undersize products can be dried.
The moisture content of the undersize after drying is 20-30%.
In this embodiment, since the technical means that the water content of the undersize product after drying is 20 to 30% is adopted, the undersize product can be ensured to be sufficiently burned after entering the cement kiln.
The dried screen lower materials are sequentially sent to a feed inlet of a decomposing furnace 21 through a third plate link chain conveyor 17, a bucket elevator 19 and a locking air valve 20.
In the embodiment, the technical means that the dried screen lower materials are sequentially conveyed into the feed inlet of the decomposing furnace through the third plate link chain conveyor, the bucket elevator and the air locking valve is adopted, so that the conveying control of the dried screen lower materials is facilitated.
The wet-shaped undersize is sent to a high-temperature steam inlet and/or a high-temperature flue gas inlet of the decomposing furnace 21 through high-temperature steam generated after the drying of the scattering dryer 18.
In the embodiment, the technical means that the high-temperature water vapor generated after the wet undersize is dried by the scattering dryer is sent to the high-temperature water vapor inlet and/or the high-temperature flue gas inlet of the decomposing furnace is adopted, so that the generated high-temperature water vapor can enter a high-temperature area at the bottom of the decomposing furnace and be used as a gasifying agent of fuel coal to carry out low-nitrogen combustion.
The high-temperature water vapor and the high-temperature flue gas are mixed and then enter the high-temperature flue gas inlet of the decomposing furnace 21.
The embodiment adopts the technical means that the high-temperature water vapor and the high-temperature flue gas are mixed and then enter the high-temperature flue gas inlet of the decomposing furnace, so that the low-nitrogen combustion is more facilitated by taking the high-temperature water vapor as the gasifying agent of the fuel coal.
Percolate in the waste collection compartment 1 is fed into the inlet of the decomposing furnace 21 and/or the kiln hood 23.
In the embodiment, the technical means that the percolate in the waste collection room is sent to the liquid inlet of the decomposing furnace and/or the kiln head cover is adopted, and ammonia nitrogen substances are contained in the percolate, so that the waste collection room is cleaned, the purpose of reducing the generation of nitrogen oxides can be achieved by the percolate, and the low-nitrogen combustion is realized.
The percolate is fed via centrifugal pump 25 to the liquid inlet of the decomposing furnace 21 and/or to the kiln head hood 23.
In the embodiment, the percolate is pumped into the liquid inlet of the decomposing furnace and/or the kiln head cover through the centrifugal pump, so that the equipment is simple, and the cost of waste disposal is reduced.
As shown in fig. 1, this embodiment provides a system for cement production after separating waste, including screening machine 6, the pan feeding mouth of screening machine 6 communicates with each other with waste collection room 1, the first discharge gate of screening machine 6 communicates with each other with the pan feeding mouth of gasifier 8, the gas outlet of gasifier 8 communicates with the high temperature flue gas entry of decomposing furnace 21, the discharge gate of gasifier 8 communicates with the pan feeding mouth of accessory ingredients 11, the second discharge gate of screening machine 6 communicates with the pan feeding mouth of decomposing furnace 21. As can be seen from fig. 1, the outlet of the gasifier 8 is provided with a regulating valve 30.
According to the embodiment, the feeding port of the screening machine is communicated with the waste collection room, the first discharging port of the screening machine is communicated with the feeding port of the gasification furnace, the air outlet of the gasification furnace is communicated with the high-temperature flue gas inlet of the decomposing furnace, the discharging port of the gasification furnace is communicated with the feeding port of the batching system, and the second discharging port of the screening machine is communicated with the feeding port of the decomposing furnace, so that the aim of saving energy sources is fulfilled by directly feeding domestic waste into the kiln due to factors such as high moisture, low heat value and uneven particle size of the domestic waste through cold and hot dual-mass separation of the domestic waste is avoided. Thoroughly incinerating dioxin in garbage. Due to the characteristics of high temperature, alkalinity, long residence time and the like of the cement kiln, dioxin can be fully burnt.
Various modifications of the present embodiment are described in detail below.
As shown in fig. 1, the first discharge port of the sieving machine 6 is communicated with the feed port of the gasification furnace 8 through a second plate feeder 7.
The first discharge port of the screening machine 6 is communicated with the feed port of the second plate type feeder 7.
The discharge port of the second plate type feeder 7 is communicated with the feed port of the gasification furnace 8.
The discharge port of the second plate type feeder 7 and the feed port of the gasification furnace 8 are provided with quantitative feeders 29.
The discharge port of the gasification furnace 8 is communicated with the feed port of the batching system 11 through a slag remover 9 and a first plate link chain conveyor 10 in sequence.
The discharge port of the gasification furnace 8 is communicated with the feed port of the slag remover 9.
The discharge port of the slag remover 9 is communicated with the feed port of the first plate link chain conveyor 10.
The discharge port of the first plate link chain conveyor 10 is communicated with the feed port of the batching system 11.
In the embodiment, the first discharge port of the screening machine is communicated with the feed port of the gasification furnace through the second plate type feeding machine; the first discharge port of the screening machine is communicated with the feed port of the second plate type feeding machine; the discharge port of the second plate type feeder is communicated with the feed port of the gasification furnace; the discharge port of the gasification furnace is communicated with the feed port of the batching system sequentially through a slag remover and a first plate link chain conveyor; the discharge port of the gasification furnace is communicated with the feed port of the slag remover; the discharge port of the slag remover is communicated with the feed port of the first plate link chain conveyor; the discharge port of the first plate link chain conveyor is communicated with the feed port of the batching system, so that inorganic ash slag generated by burning the oversize material can be used for producing raw materials of cement, and high-temperature flue gas generated by burning the oversize material can be used for heating and treating the raw materials of cement, thereby further saving energy.
As shown in fig. 1, the second discharging port of the sieving machine 6 is communicated with the feeding port of the movable bottom bin 13.
The discharge port of the movable bottom bin 13 is communicated with the feed port of the quantitative feeder 14.
The discharge port of the quantitative feeder 14 is communicated with the feed port of the electric three-way valve 15.
A moisture analyzer 16 is arranged between the electric three-way valve 15 and the movable bottom bin 13.
The moisture analyzer 16 is connected to a moisture content sensing means.
The moisture content sensing component is arranged in the movable bottom bin 13.
The moisture content sensing component is arranged at the bottom of the movable bottom bin 13.
The control signal output end of the moisture analyzer 16 is electrically connected with the control signal input end of the electric three-way valve 15.
The first discharge port of the electric three-way valve 15 is communicated with the feed port of the third plate link chain conveyor 17.
The discharge port of the third plate link chain conveyor 17 is communicated with the feed port of the bucket elevator 19.
The discharge port of the bucket elevator 19 is communicated with the feed port of the air locking valve 20.
The discharge port of the air locking valve 20 is communicated with the feed port of the decomposing furnace 21.
The second discharge port of the electric three-way valve 15 is communicated with the feed port of the scattering dryer 18.
The discharge port of the scattering dryer 18 is communicated with the feed port of the third plate link chain conveyor 17.
The high-temperature flue gas inlet of the scattering dryer 18 is communicated with the high-temperature flue gas outlet of the gasifier 8.
The high-temperature steam outlet of the scattering dryer 18 is communicated with the high-temperature steam inlet of the decomposing furnace 21 and/or communicated with the high-temperature flue gas inlet of the decomposing furnace 21.
In the embodiment, the second discharge port of the screening machine is communicated with the feed port of the movable bottom bin; the discharge port of the movable bottom bin is communicated with the feed port of the quantitative feeder; the discharge port of the quantitative feeder is communicated with the feed port of the electric three-way valve; a moisture analyzer is arranged between the electric three-way valve and the movable bottom bin; the moisture analyzer is connected with a moisture content sensing component; the moisture content sensing component is arranged in the movable bottom bin; the moisture content sensing component is arranged at the bottom of the movable bottom bin; the control signal output end of the moisture analyzer is electrically connected with the control signal input end of the electric three-way valve; the first discharge port of the electric three-way valve is communicated with the feed port of the third plate link chain conveyor; the discharge port of the third plate link chain conveyor is communicated with the feed port of the bucket elevator; the discharge port of the bucket elevator is communicated with the feed port of the air locking valve; the discharge port of the air locking valve is communicated with the feed port of the decomposing furnace; the second discharge port of the electric three-way valve is communicated with the feed inlet of the scattering dryer; the discharge port of the scattering dryer is communicated with the feed port of the third plate link chain conveyor; the high-temperature flue gas inlet of the scattering dryer is communicated with the high-temperature flue gas outlet of the gasifier; the high-temperature steam outlet of the scattering dryer is communicated with the high-temperature steam inlet of the decomposing furnace and/or communicated with the high-temperature flue gas inlet of the decomposing furnace, so that the dry screen underflows and the dry screen underflows can be used for fully burning cement raw materials, and the high-temperature steam generated after the wet screen underflows are dried can enter a high-temperature area at the bottom of the decomposing furnace and serve as a gasifying agent of fuel coal to burn low nitrogen.
As shown in fig. 1, the feed inlet of the sieving machine 6 is communicated with the discharge outlet of the belt conveyor 5.
The feed inlet of the belt conveyor 5 is communicated with the discharge outlet of the crusher 4.
The feeding port of the crusher 4 is communicated with the discharging port of the first plate type feeding machine 3.
A grab bucket 2 is arranged between the feed inlet of the first plate feeder 3 and the waste collection room 1.
In the embodiment, the feeding port of the screening machine is communicated with the discharging port of the belt conveyor; the feeding port of the belt conveyor is communicated with the discharging port of the crusher; the feeding port of the crusher is communicated with the discharging port of the first plate type feeding machine; the technical means of the grab bucket is arranged between the feeding port of the first plate type feeding machine and the waste collection room, so that the waste can be crushed, and the conveying control of the waste is facilitated.
As shown in fig. 1, the air outlet of the waste collection room 1 is communicated with the air inlet of the odor adjusting and controlling device 26. The air outlet of the waste collection room 1 is communicated with the air inlet of the odor adjusting and controlling device 26 through an induced draft fan 28.
The first air outlet of the odor adjusting and controlling device 26 is communicated with the air inlet of the gasification furnace 8.
The second air outlet of the odor adjusting and controlling device 26 is communicated with the high temperature area of the grate cooler 24.
The second air outlet of the odor adjusting and controlling device 26 is communicated with the air inlet of the emergency deodorizing system 27.
In the embodiment, the air outlet of the waste collection room is communicated with the air inlet of the odor adjusting and controlling device; the first air outlet of the odor adjusting and controlling device is communicated with the air inlet of the gasification furnace; the second air outlet of the odor adjusting and controlling device is communicated with a high-temperature area of the grate cooler; the second air outlet of the odor adjusting and controlling device is communicated with the air inlet of the emergency deodorizing system, so that the air in the waste collection room can be greatly purified, the odor is turned into wealth to be utilized, and meanwhile, the odor in the odor is eliminated, and the energy is further saved.
As shown in fig. 1, the liquid outlet of the waste collection chamber 1 is communicated with the liquid inlet of the centrifugal pump 25.
The liquid outlet of the centrifugal pump 25 is communicated with the liquid inlet of the decomposing furnace 21.
The liquid outlet of the centrifugal pump 25 is communicated with the liquid inlet of the kiln head cover 23.
The grate cooler 24 is communicated with the kiln head of the rotary kiln 22 through the kiln head cover 23.
The kiln tail of the rotary kiln 22 is communicated with the lower end of the decomposing furnace 21.
In the embodiment, the liquid outlet of the waste collection room is communicated with the liquid inlet of the centrifugal pump; the liquid outlet of the centrifugal pump is communicated with the liquid inlet of the decomposing furnace; the liquid outlet of the centrifugal pump is communicated with the liquid inlet of the kiln head cover; the grate cooler is communicated with the kiln head of the rotary kiln through the kiln head cover; the kiln tail of the rotary kiln is communicated with the lower end of the decomposing furnace, so that the rotary kiln is beneficial to cleaning a waste collection room, and the percolate can achieve the purpose of reducing the generation of nitrogen oxides and realize low-nitrogen combustion.
Plate feeding machine:
mainly comprises a head driving device, a tail wheel device, a tensioning device, a chain plate part and a frame. The drag chain and the trough plate of the plate feeder chain plate are different from the conventional structure. The traction chain is changed from a conventional sheet type chain into a heavy plate chain, and the trough plate consists of a double wave reinforced trough plate. The bottom is provided with a cleaning device. The bottom plate of the cleaning device is a high-density polyethylene plate, the scraping plates are also made of high-density polyethylene materials, and the scraping plates are linked by plate chains to scrape leakage materials on the floor into the discharge chute.
And (3) a crusher:
the automatic cutting machine comprises a control system, a frame, a driving device and a hopper, wherein a pair of cutter heads are arranged in the hopper, fixed cutter heads are arranged on two sides of the hopper body, the fixed cutter heads are consistent with the movable cutter heads in arc angle and are in meshing trend, and the fixed cutter heads and the movable cutter heads connected on a shaft are sheared and torn. The direction of the cutter point direction axis of the movable cutter head is vertical, the movable cutter head is a half crescent shovel, and the principle of spiral line intermittent cutting is utilized during crushing, so that the movable cutter head, the movable cutter head and the fixed cutter head are involved in cutting at different cutting points, shearing, tearing and crushing are completed, the instantaneous cutting force of the cutting point is improved, and energy is saved.
Sieving machine:
the screen frame, set up the drive mechanism on the screen frame and support the screen drum on the screen frame, the one end of screen drum is provided with the feed inlet, and the other end is provided with the discharge gate, the surface of screen drum is formed with netted sieve mesh, and the screen drum is vibration type setting through the rotation of roller bearing. Through the mode, the garbage can be stirred, the special-shaped blades are welded on the periphery of the screen cylinder, so that the caked garbage is scattered and broken, the reliable screening is ensured, the efficient screening of the garbage is ensured, and the garbage treatment effect is improved.
Scattering dryer:
comprises a feed inlet, a discharge outlet, an air inlet, an air outlet, two scattering shafts, a special-shaped scattering gear welded on the two scattering shafts, a roller, namely a shoveling plate welded on the roller and a frame. The outer surface of the high-temperature belt of the rotary roller is welded with spiral blanking plates at intervals along the circumference and shoveling plates formed by welding straight vertical guide plates at intervals along the circumference; a drying space is formed between the rotary roller and the outer cylinder skin of the dryer. After the high-temperature flue gas enters, the materials are scattered and then stay in the shoveling plate to fall, and heat exchange drying is carried out.
Step feeder:
mainly comprises different numbers of motors with push rods, sliding rails, iron plates and bins. A motor push rod is connected with an iron plate, and the iron plates are connected with each other through grooves, so that the motor push rod can slide, and garbage leakage is avoided. When the motor push rod operates, the motor push rod is pushed to the outlet of the garbage bin, and garbage discharging is achieved by withdrawing push rods with different numbers.
Vertical rotary gasification furnace:
a garbage gasifying combustion system comprises a garbage feeding port, a flue gas outlet, a primary air inlet, a furnace cover, a rotary furnace body, a rotary furnace grate, a furnace body base, a slag remover, a slag pool, a slag breaking rod and the like. After the garbage enters the gasification furnace along the periphery of the gasification furnace, the garbage is distributed under the rotation of the rotary furnace body, slag breaking bars welded on the periphery of the furnace body can uniformly distribute massive materials, and primary air enters the furnace body after being blown into a grate from the furnace body base. The rotary grate is tower structure, primary air passes through the gaps of each layer of grate, and cast iron slag breaking bars are arranged on the upper side of the grate to break large-scale coke slag. When the grate rotates, primary air passes through, slag loosens and falls into a slag pool along the periphery of the furnace body to be cooled, and the slag is fished out by a slag remover after being cooled and sent to a batching workshop.

Claims (2)

1. A method for producing cement by separating waste materials, which is characterized in that: firstly separating the waste into large-particle waste and small-particle waste, then separating high-temperature flue gas and inorganic ash by heating and gasifying the large-particle waste, then sending the high-temperature flue gas into a decomposing furnace (21), and sending the inorganic ash into a batching system (11) for cement kiln raw materials;
Separating the waste by a screening machine (6);
the large-particle waste after sieving is the oversize material;
the small particle waste after sieving is undersize;
the oversize material is heated and gasified by a gasification furnace (8) to separate high-temperature flue gas and inorganic ash;
feeding the inorganic ash into a slag remover (9) for water cooling;
fishing out the inorganic ash after water cooling;
the fished inorganic ash is sent into a batching system (11) through a first plate link chain conveyor (10);
the oversize is sent into the gasification furnace (8) from the screening machine (6) through the second plate type feeding machine (7);
the odor in the waste collection room (1) is used as primary air for gasification and incineration to incinerate the oversize materials; the odor is sent into the gasification furnace (8) from the waste collection room (1) through the odor adjusting and controlling device (26); the redundant odor is introduced into a high temperature section of a grate cooler (24) of the cement kiln through an odor adjusting and controlling device (26) to be burnt as primary air; introducing malodor into an emergency deodorizing system (27) in an emergency situation; high-temperature flue gas generated by burning the oversize materials is sent to a high-temperature flue gas inlet of a decomposing furnace (21);
the temperature of the high-temperature flue gas at the gas outlet of the gasifier (8) is 800-1000 ℃;
the temperature of the high-temperature flue gas at the gas outlet of the gasification furnace (8) is regulated and controlled by the primary air quantity and the garbage feeding quantity;
The undersize is firstly stored in a movable bottom stock bin (13);
the undersize is sent into a movable bottom bin (13) from a screening machine (6) through a second plate chain conveyor (12);
the undersize material is sequentially sent to a third plate chain conveyor (17) or a scattering dryer (18) from a movable bottom bin (13) through a quantitative feeder (14) and an electric three-way valve (15);
the water content of the sieved materials in the movable bottom bin (13) is detected by a water content analyzer (16);
the moisture analyzer (16) controls the electric three-way valve (15) to send the undersize to the third plate link chain conveyor (17) or the scattering dryer (18) according to the moisture detection result of the undersize;
the undersize material comprises dry undersize material and wet undersize material;
the moisture of the dry undersize is less than 30%;
the moisture of the wet-like undersize is greater than or equal to 30%;
directly feeding the dry undersize into a cement kiln for incineration;
the dry undersize material is sent into a feed inlet of a decomposing furnace (21) through a third plate link chain conveyor (17), a bucket elevator (19) and a locking air valve (20) in sequence;
drying the wet undersize material to form a dried undersize material, and then conveying the dried undersize material into a cement kiln for incineration;
drying the wet undersize by a scattering dryer (18);
the wet undersize material stays in the scattering dryer (18) for 30-45 minutes;
drying the wet undersize material by utilizing high-temperature flue gas generated after the undersize material is incinerated;
The high temperature flue gas temperature for drying wet-shaped undersize is 700-800 ℃;
the high-temperature flue gas temperature for drying wet undersize is regulated by the air odor, so as to control the drying temperature of the undersize;
the water content of the screen lower after drying is 20-30%;
the screen underflows after drying are sequentially sent into a feed inlet of a decomposing furnace (21) through a third plate link chain conveyor (17), a bucket elevator (19) and a locking air valve (20);
the wet undersize is sent to a high-temperature steam inlet and/or a high-temperature flue gas inlet of a decomposing furnace (21) through high-temperature steam generated after the drying of a scattering dryer (18);
the high-temperature water vapor and the high-temperature flue gas are mixed and then enter a high-temperature flue gas inlet of a decomposing furnace (21).
2. The method for classifying wastes for cement production according to claim 1, wherein:
the waste comprises municipal primary household garbage and/or stale garbage;
the large-particle waste is high-heat-value large-particle waste;
the small particle waste is low-heat value small particle waste;
crushing the waste before separating the waste into large-particle waste and small-particle waste;
crushing the waste by a crusher (4);
the waste is sent into a crusher (4) from a waste collecting room (1) through a grab bucket (2) and a first plate type feeding machine (3) in sequence;
The crushed waste is sent into a screening machine (6) from a crusher (4) through a belt conveyor (5);
the maximum size of the crushed large-particle waste is less than or equal to 200mm, and the minimum size is more than or equal to 30mm;
the maximum size of the crushed small particle waste is less than 30mm;
the percolate in the waste collection room (1) is sent into a liquid inlet of a decomposing furnace (21) and/or a kiln head cover (23);
the percolate is sent into a liquid inlet of a decomposing furnace (21) and/or a kiln head cover (23) through a centrifugal pump (25).
CN201811344211.1A 2018-11-13 2018-11-13 Method and system for producing cement by separating waste Active CN109160756B (en)

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CN105972604A (en) * 2016-07-06 2016-09-28 北京建筑材料科学研究总院有限公司 Household garbage cooperative preliminary disposal system coupled to cement kiln and disposal method
CN106680054A (en) * 2017-02-14 2017-05-17 深圳市能源环保有限公司 Waste incineration fly ash chelate leach liquor and preparation and application method thereof
CN107339702A (en) * 2017-04-06 2017-11-10 蓝天众成环保工程有限公司 A kind of method of cement kiln synergic processing urban and rural domestic refuse
CN107816726A (en) * 2017-11-30 2018-03-20 广东东实开能能源有限公司 A kind of cement kiln synergic processing house refuse system and method with steam turbine dragging

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* Cited by examiner, † Cited by third party
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JPH09295840A (en) * 1996-02-27 1997-11-18 Ebara Corp Method for cement calcination
JP2000018530A (en) * 1998-07-03 2000-01-18 Hitachi Zosen Corp Method and device for supplying waste in gasification incinerating facility
CN103785792A (en) * 2014-03-07 2014-05-14 孙晓宇 Continuous clay sand mixer
CN205077016U (en) * 2015-07-31 2016-03-09 河南心连心化肥有限公司 Can adjust slurrying device of coal slurry granularity ratio and concentration in a flexible way
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CN107339702A (en) * 2017-04-06 2017-11-10 蓝天众成环保工程有限公司 A kind of method of cement kiln synergic processing urban and rural domestic refuse
CN107816726A (en) * 2017-11-30 2018-03-20 广东东实开能能源有限公司 A kind of cement kiln synergic processing house refuse system and method with steam turbine dragging

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