CN112744595A - Limestone conveying device and method for desulfurization of incinerator - Google Patents

Limestone conveying device and method for desulfurization of incinerator Download PDF

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Publication number
CN112744595A
CN112744595A CN202110019900.0A CN202110019900A CN112744595A CN 112744595 A CN112744595 A CN 112744595A CN 202110019900 A CN202110019900 A CN 202110019900A CN 112744595 A CN112744595 A CN 112744595A
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limestone
incinerator
conveying
air
switch valve
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Inventor
武志飞
赵凤
骆春晓
王娜
许靖平
申维真
郭漫宇
陈焱妍
王波
孙连俊
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Beijing Jingcheng Environmental Protection Co ltd
BMEI Co Ltd
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Beijing Jingcheng Environmental Protection Co ltd
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Priority to CN202110019900.0A priority Critical patent/CN112744595A/en
Publication of CN112744595A publication Critical patent/CN112744595A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/48—Screws or like rotary conveyors
    • 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
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • 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
    • B01D53/81—Solid phase processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/46—Gates or sluices, e.g. rotary wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/606—Carbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/02—Articles
    • B65G2201/0291—Pig used in pipe conveyors, e.g. a Molch

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (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)

Abstract

A limestone conveying device and a limestone conveying method for desulfurization of an incinerator belong to the technical field of environmental protection. The bottom and the gate valve in lime stone storage storehouse are connected, the other end and the access connection of one-level rotatory tripper of gate valve, the export and the pneumatic switch valve of one-level rotatory tripper are connected, the feed inlet and the discharge gate of weightlessness scale are respectively through the other end of flexible coupling and pneumatic switch valve and the entry linkage of exhaust chamber, the export and the second grade rotatory tripper of exhaust chamber are connected, the other end and the feed inlet of material boots of second grade rotatory tripper are connected, connect gradually pressure measurement instrument, venturi and check valve between the export of roots's fan and the air inlet of material boots, the discharge gate of material boots passes through pipeline and is connected with pneumatic switch valve and the elephant trunk of unloading respectively, the end of elephant trunk of unloading is connected with burning furnace. The invention realizes the functions of feeding, conveying and metering powder/granular limestone desulfurized by the incinerator and has the advantages of smooth feeding, no gas return, small conveying pressure-stabilizing resistance, real-time monitoring of material feeding and the like.

Description

Limestone conveying device and method for desulfurization of incinerator
Technical Field
The invention relates to a limestone conveying device and method for desulfurization of an incinerator, belonging to the technical field of environmental protection.
Background
Materials such as dried sludge can produce a large amount of sulfur dioxide in the incineration process, and in order to reduce the desulfurization cost and the treatment difficulty of a tail gas purification facility, the combustion flue gas needs to be subjected to desulfurization treatment. In the in-furnace desulfurization process, limestone powder or particles are usually used as a desulfurizer, calcium carbonate components in limestone react with sulfur dioxide to generate calcium sulfate and carbon dioxide, so that sulfur elements in flue gas are transferred from a gas phase to a solid phase, and the desulfurization target is realized. The reaction equation is CaCO3+SO2+1/2O2＝＝CaSO4+CO2. In order to achieve good desulfurization effect in the incinerator, the incinerator desulfurization needs to be provided with a perfect and reliable limestone conveying system for continuous desulfurizationRaw materials are combined with equipment meeting the process requirements to realize the functions of blanking, conveying, metering, parameter adjusting and controlling of desulfurized limestone powder/particles.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a limestone conveying device and a limestone conveying method for desulfurization of an incinerator.
A limestone conveying device for desulfurization of an incinerator, wherein an limestone discharging and metering part comprises a limestone storage bin, a gate valve at the bottom of the limestone storage bin, a primary rotary discharger, a pneumatic switch valve, a flexible connection, a weightlessness scale, an air extracting chamber, a secondary rotary discharger and a material boot, the bottom of the limestone storage bin is connected with the gate valve, the other end of the gate valve is connected with an inlet of the primary rotary discharger, an outlet of the primary rotary discharger is connected with the pneumatic switch valve, a feed inlet and a discharge outlet of the weightlessness scale are respectively connected with the other end of the pneumatic switch valve and an inlet of the air extracting chamber through the flexible connection, an outlet of the air extracting chamber is connected with the secondary rotary discharger, the other end of the secondary rotary discharger is connected with a feed inlet of the material boot, a limestone air conveying part comprises a Roots blower, a pressure detecting instrument, a Venturi, a check valve, a material boot, a pneumatic switch valve, a conveying pipeline and, the pressure detection instrument, the Venturi and the check valve are sequentially connected between the outlet of the Roots blower and the air inlet of the material shoe, the discharge port of the material shoe is respectively connected with the pneumatic switch valve and the discharge chute through a conveying pipeline, and the tail end of the discharge chute is connected with the incinerator.
The weightlessness scale is provided with a buffering hopper, a stirring motor and a high material level/material weight switch are connected in the buffering hopper, the bottom of the buffering hopper is connected with a screw conveyer, an outlet of the screw conveyer is connected with one end of a flexible connection, and the other end of the flexible connection is connected with an inlet of an air pumping chamber. The discharge port of the material boot is connected with the discharge chute through a wear-resistant conveying pipeline.
A method for transporting limestone for desulfurization of an incinerator, comprising the steps of: the limestone materials are discharged from the limestone storage bin, the discharged limestone materials sequentially pass through the gate valve, the primary rotary discharger, the pneumatic switch valve and the buffering hopper of the weightlessness scale, the limestone materials are stored and weighed in the buffering hopper, when the limestone of the buffering hopper reaches a certain amount, the high material level/material weight switch of the weightlessness scale is triggered, the primary rotary discharger and the pneumatic switch valve are interlocked and closed in sequence,
the stirring motor of the buffer hopper continuously rotates to prevent the limestone materials (limestone powder/particles) from bridging in the hopper and feeding the limestone materials through the screw conveyer at the bottom of the buffer hopper,
limestone materials enter the air pumping chamber through a screw conveyer of a weightlessness scale, then enter the secondary rotary discharger and the material boot from the bottom of the air pumping chamber in sequence, the limestone materials in the material boot wait for the air supply system to convey the limestone materials to the incinerator,
the outlet of the Roots blower is sequentially provided with a pressure detection instrument, a Venturi and a check valve, airflow at the outlet of the Roots blower enters the material boot after being stabilized in pressure and stabilized in flow after passing through the Venturi, the airflow carries out dilute-phase positive pressure pneumatic conveying on limestone inside the material boot, the limestone enters the discharging chute through a pneumatic switch valve and a conveying pipeline, and the limestone enters the incinerator after being decelerated and stabilized in flow inside the discharging chute.
The weightlessness scale monitors and adjusts the adding amount of limestone in real time.
The gravity unloading of dispersion and even lime stone material when one-level rotatory tripper starts, can block the blanking of lime stone when one-level rotatory tripper is closed.
The outlet of the first-stage rotary discharger is connected with a pneumatic switch valve, and when the discharging is started, the pneumatic switch valve is started before the first-stage rotary discharger; when the blanking is stopped, the first-stage rotary discharger is closed before the pneumatic switch valve, so that the pneumatic switch valve is not blocked to cause poor sealing.
Limestone blanking enters the material boot through the air exhaust chamber and the second-stage rotary discharger in sequence, the air exhaust chamber caches the limestone blanking, and the top of the hopper is provided with a filter drum for discharging return air of an air supply system caused by poor sealing of the second-stage rotary discharger.
A pressure detection instrument is arranged between the outlet of the Roots blower and the material boot air inlet, the wind resistance of the conveying system can be fed back in real time by pressure detection, and the pressure is small, which indicates that the limestone is not smoothly discharged and the conveying pipeline is empty and blown; the pressure is larger, which shows that the conveying resistance is large, and the pipeline tends to be blocked.
A Venturi and a check valve are arranged between the Roots blower and the material boot air inlet, the Venturi stabilizes the air quantity and the air flow entering the material boot, the check valve can prevent the material in the material boot from flowing back to the Roots blower to cause faults when the machine is stopped or the air supply system is abnormal, and meanwhile, a limestone blanking equipment set and an air supply equipment set are started to serve as a conveying device of the desulfurizer of the incinerator; the limestone blanking equipment set can be closed, and the air supply equipment set can be opened to be used as an auxiliary air blowing device for combustion-supporting air of the incinerator.
The invention adopts a two-stage rotary discharger, a weightlessness scale, an air exhaust chamber and a material boot as key structures for discharging/discharging the limestone silo, adopts a Roots blower, a Venturi, a check valve, the material boot, a wear-resistant pipeline and a discharging chute as key structures for pneumatic conveying of limestone, realizes the functions of discharging, conveying and metering of powder/granular limestone desulfurized by an incinerator, and has the advantages of smooth discharging, no gas return, small conveying pressure-stabilizing resistance, real-time monitoring of material feeding and the like.
The invention has the advantages that:
1. the two-stage rotary discharger is arranged, the impact and influence of limestone gravity blanking on a weightless scale are buffered by the buffering and distributing functions of the one-stage rotary discharger, and the gas return of the pneumatic conveying system to the discharging system can be effectively reduced by the sealing function of the impeller and the material of the second-stage rotary discharger.
2. The weight loss scale is arranged, the limestone adding amount can be displayed in real time and accumulated in stages, and the limestone adding amount can be conveniently adjusted according to the process requirements and the conveying capacity.
3. The system can be operated in two modes of blowing and feeding, wherein the blowing mode realizes the function of conveying and metering desulfurized limestone of the incinerator, and the blowing mode does not feed materials, so that the system can assist in supplementing combustion-supporting air of the incinerator when the working condition needs.
Drawings
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the accompanying drawings are included to provide a further understanding of the invention and form a part of this specification, and wherein the illustrated embodiments of the invention and the description thereof are intended to illustrate and not limit the invention, as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic process flow diagram of the present invention.
In the figure: a limestone storage bin 1; a gate valve 2; a primary rotary discharger 3; a pneumatic on-off valve 4; a flexible connection 5; a weightlessness scale 6; an air extraction chamber 7; a secondary rotary discharger 8; a material boot 9; a Roots blower 10; a pressure detecting instrument 11; a venturi 12; a check valve 13; a pneumatic on-off valve 14; a delivery duct 15; a discharge chute 16; an incinerator 17.
The invention is further illustrated with reference to the following figures and examples.
Detailed Description
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The following examples are further illustrative and should not be construed as limiting the embodiments of the present invention.
Example 1: as shown in figure 1, the limestone conveying device for desulfurization of the incinerator comprises a limestone storage bin 1, a gate valve 2 at the bottom of the limestone storage bin 1, a primary rotary discharger 3, a pneumatic switch valve 4, a flexible connection 5, a weightlessness scale 6, an extraction chamber 7, a secondary rotary discharger 8 and a material boot 9.
The bottom of lime stone storage 1 is connected with push-pull valve 2, and the other end of push-pull valve 2 and the access connection of one-level rotatory tripper 3, the export of one-level rotatory tripper 3 is connected with pneumatic switch valve 4, and the feed inlet and the discharge gate of weightless balance 6 are connected with the other end of pneumatic switch valve 4 and the entry of aspiration chamber 7 through flexible coupling 5 respectively, and the export of aspiration chamber 7 is connected with second grade rotatory tripper 8, and the other end of second grade rotatory tripper 8 is connected with the feed inlet of material boots 9. The weightlessness scale 6 is provided with a buffering hopper, a stirring motor and a high material level/material weight switch are connected in the buffering hopper, the bottom of the buffering hopper is connected with a screw conveyer, the outlet of the screw conveyer is connected with one end of a flexible connection 5, and the other end of the flexible connection 5 is connected with the inlet of the air pumping chamber 7.
The limestone pneumatic conveying part comprises a Roots blower 10, a pressure detecting instrument 11, a Venturi 12, a check valve 13, a material shoe 9, a pneumatic switch valve 14, a conveying pipeline 15 and a discharge chute 16.
A pressure detecting instrument 11, a Venturi 12 and a check valve 13 are sequentially connected between an outlet of the Roots blower 10 and an air inlet of the material shoe 9, a discharge port of the material shoe 9 is respectively connected with a pneumatic switch valve 14 and a discharge chute 16 through a conveying pipeline 15, and the tail end of the discharge chute 16 is connected with an incinerator 17.
Example 2: as shown in fig. 2, a limestone conveying method for desulfurization of an incinerator comprises the following steps:
the limestone materials are discharged from the limestone storage bin 1, the discharged limestone materials sequentially pass through the gate valve 2, the primary rotary discharger 3, the pneumatic switch valve 4 and the buffering hopper of the weightlessness scale 6 through the flexible coupling 5, the limestone materials are stored in the buffering hopper and weighed, the high material level/material weight switch of the weightlessness scale is triggered when the limestone of the buffering hopper reaches a certain amount, and then the primary rotary discharger 3 and the pneumatic switch valve 4 are interlocked and closed in sequence.
The stirring motor of buffer hopper lasts and rotates, prevents that the lime stone material (lime stone powder/granule) from bridging in the hopper inside, ensures the feed effect to buffer hopper bottom screw conveyer simultaneously.
Limestone materials enter an air pumping chamber 7 through a screw conveyer of a weightlessness scale 6, then enter a secondary rotary discharger 8 and a material boot 9 from the bottom of the air pumping chamber 7 in sequence, and the limestone materials in the material boot 9 wait for an air conveying system to convey the limestone materials to an incinerator 17.
The outlet of the Roots blower 10 is sequentially provided with a pressure detection instrument 11, a Venturi 12 and a check valve 13, airflow at the outlet of the Roots blower 10 enters the material boot 9 after passing through the Venturi 12 and being stabilized in pressure and flow, the airflow carries out dilute-phase positive pressure pneumatic conveying on limestone inside the material boot 9 and enters the discharging chute 16 through a pneumatic switch valve 14 and a conveying pipeline 15, and the limestone enters the incinerator 17 after being decelerated and stabilized in flow inside the discharging chute 16.
The invention comprises the process steps of gravity blanking, weighing and metering, pneumatic conveying and the like of limestone, can realize continuous feeding of limestone powder or particles required by the desulfurization incinerator, and has the characteristics of uniform and smooth blanking, real-time adjustable material adding amount and small stable resistance of a pneumatic conveying system.
Example 3: as shown in fig. 1 and 2, a limestone conveying device for desulfurization of an incinerator comprises a limestone feeding and metering part and a limestone air conveying part, wherein the limestone feeding and metering part and the limestone air conveying part are connected by a material shoe 9. The limestone blanking and metering part realizes the longitudinal transfer of materials in the limestone storage bin 1 by taking the material boot 9 as a terminal point.
The process comprises the following steps:
when the blanking is started, the gate valve 2 is opened, the pneumatic switch valve 4 is opened, the primary rotary discharger 3 is opened, limestone powder/particles enter the primary rotary discharger 3 under the action of gravity, rotate along with the rotary impeller and are output from an outlet, the limestone continuously passes through the pneumatic switch valve 4 and the flexible connection 5 in sequence under the action of gravity and enters the weightlessness scale 6, the limestone enters the variable-frequency conveying screw of the weightlessness scale 6 after being temporarily stored in the slow storage hopper of the weightlessness scale 6 for a short time, the conveying screw operates at the speed regulated by an operator and outputs limestone materials, the limestone enters the air exhaust chamber 7 and the secondary rotary discharger 8 under the action of gravity, and is conveyed to the material boot 9 along with the rotary impeller of the secondary rotary discharger 8.
When the machine is stopped, the upper-level rotary discharger 3 is closed, the pneumatic switch valve 4 is closed, the conveying screw of the weightlessness scale 6 is closed in a delayed manner after the materials in the buffering hopper of the weightlessness scale 6 are discharged, and the second-level rotary discharger 8 is closed in a delayed manner.
The limestone pneumatic conveying part realizes the horizontal transfer of limestone materials in the material boot 9, and takes the material boot 9 as a starting point and the incinerator 17 as a terminal point.
When the conveying is started, the pneumatic switch valve 14 is opened, the Roots blower 10 is started, and the limestone moves to the discharge chute 16 along the conveying pipeline 15 and then enters the incinerator 17. When the machine is stopped, after the limestone discharging and metering part is completely stopped, namely the secondary rotary discharger 8 is closed, the Roots blower 10 is closed in a delayed mode, the pneumatic switch valve 14 is closed in a delayed mode, and materials in the material boot 9 and the conveying pipeline 15 are guaranteed to be completely blown into the incinerator 17.
Example 4: as shown in fig. 1 and 2, a limestone conveying device for desulfurization in an incinerator is divided into a limestone feeding and metering part and a limestone pneumatic conveying part. The limestone blanking and metering process system longitudinally transfers limestone materials into the material boot under the action of gravity, and comprises a gate valve, a primary rotary discharger, a pneumatic switch valve, a weightlessness scale, an air suction chamber, a secondary rotary discharger and the material boot which are sequentially connected with the lower part of a limestone storage bin; the pneumatic limestone conveying process comprises the step of conveying limestone in the material shoes to the incinerator in a horizontal direction in a pneumatic mode to perform desulfurization reaction, and comprises a Roots blower, a pressure detection instrument, a Venturi, a check valve, the material shoes, a pneumatic switch valve, a conveying pipeline and an unloading chute.
When the feeding is started, the pneumatic switch valve and the first-stage rotary discharger are interlocked with the weightless weighing material level/material weight, the pneumatic switch valve and the first-stage rotary discharger are sequentially started by the low material level/material weight interlocking, and the first-stage rotary discharger and the pneumatic switch valve are sequentially closed by the high material level/material weight interlocking.
The flexible connection is arranged at the front and the back of the weightlessness scale to ensure the weighing function of the weightlessness scale.
The weightlessness scale has the functions of caching materials, feeding back, accumulating and adjusting the limestone adding amount in real time. The weightlessness scale is matched with the buffer hopper, so that the material can be stored and the blanking of superior equipment can be stabilized, and the hopper is provided with a stirring motor to prevent limestone powder/particles from hardening and bridging in the hopper; the weightlessness weighing and weighing instrument can monitor the material weight condition of the buffer hopper so as to control upstream blanking equipment in an interlocking manner, and display and accumulate the limestone adding amount in real time; the weightlessness scale is matched with a variable frequency screw, and the dosage of limestone can be adjusted and controlled through the frequency change of the screw.
The discharge of the weightlessness scale sequentially passes through the air exhaust chamber, the second-stage rotary discharger and the material boot feed inlet, the limestone is continuously discharged into the material boot by the second-stage rotary discharger, and the air exhaust system of the air exhaust chamber returns air through the second-stage rotary discharge valve to maintain smooth blanking.
The material in the material boot is continuously conveyed to the incinerator through a conveying pipeline by an air conveying system.
The roots's fan is as the power supply of pneumatic conveying system, and the export sets up the venturi and can make the amount of wind and the air current that get into the material boots tend to steadily, and the check valve can prevent that the lime stone in the material boots from getting into roots's fan and causing the trouble.
A pressure monitoring instrument is arranged between the Roots blower and the material boot air inlet, so that the conveying pressure of the air conveying system can be monitored and an over-value alarm is given, and low pressure indicates that less conveyed materials exist and the pipeline is empty and blown; the high pressure indicates that the material may be partially blocked in the pipeline and should be stopped for inspection.
The material boot discharge port is connected with the incinerator through a conveying pipeline made of wear-resistant materials, the conveying pipeline adopts an elbow with a large curvature radius, and special wear-resistant treatment is carried out at the elbow, so that conveying resistance is reduced. The tail end of the conveying pipeline is fed into the furnace by adopting the discharging chute, so that the feeding speed of the limestone materials is reduced, and the impact of limestone particles on refractory materials in the furnace is avoided when granular materials are adopted.
The pneumatic switch valve is arranged on the conveying pipeline, so that the air circulation between the incinerator and the device is cut off when the incinerator is stopped, and the heat radiation is prevented.
The limestone conveying device and the method can convey loose limestone ore powder/particle with the particle size of 20-100 meshes, and the conveying and metering range is 50-300 kg/h.
The limestone conveying device and method adopt a positive-pressure dilute-phase conveying mode, the feeding is continuous and stable, a Roots blower is adopted as a conveying air source, and the outlet pressure of the blower is 0.5-0.9 bar.
The limestone conveying device and the limestone conveying method are suitable for conveying distance of 20-100m, and the number of the pipeline elbows is not more than 10.
Example 5: as shown in figures 1 and 2, the lower part of a limestone storage bin is sequentially connected with a gate valve, a primary rotary discharger, a pneumatic switch valve, a weightlessness scale, an air extraction chamber, a secondary rotary discharger and a material boot, and the discharge of the limestone storage bin adopts gravity blanking.
A limestone conveying device for desulfurization of an incinerator can simultaneously open a limestone blanking equipment set and an air supply equipment set to serve as a conveying device for desulfurizer of the incinerator; or the limestone blanking equipment set is closed, and only the air supply equipment set is opened to be used as an auxiliary air blowing device of combustion-supporting air of the incinerator.
Limestone blanking equipment set: the device comprises a gate valve, a primary rotary discharger, a pneumatic switch valve, a weightlessness scale, an air extraction chamber, a secondary rotary discharger and a material boot which are sequentially connected with the lower part of a limestone storage bin.
Air conveying equipment set: comprises a Roots blower, a pressure detecting instrument, a Venturi, a check valve, a material boot, a pneumatic switch valve, a conveying pipeline and a discharging chute.
The outlet pipeline of the Roots blower is sequentially provided with a pressure detection instrument, a Venturi and a check valve and is connected with a material boot air inlet, a material boot discharge port is provided with a pneumatic switch valve, the inlet side of the incinerator is provided with an inclined discharge chute, the material boot discharge port is connected with the discharge chute through a wear-resistant conveying pipeline, and limestone powder/aggregate in the material boot is conveyed into the incinerator by dilute phase pneumatic under the action of the air blowing of the Roots blower.
And a weightlessness scale is arranged, the weightlessness scale comprises a buffer hopper, a stirring motor, a variable frequency screw and a weighing instrument, and the weightlessness scale can monitor and adjust the adding amount of limestone in real time.
Set up the rotatory tripper of one-level, the gravity unloading of dispersible and even limestone material when the rotatory tripper of one-level starts, can block the blanking of limestone when the rotatory tripper of one-level closes.
The outlet of the first-stage rotary discharger is connected with a pneumatic switch valve, and when the discharging is started, the pneumatic switch valve is started before the first-stage rotary discharger; when the blanking is stopped, the first-stage rotary discharger is closed before the pneumatic switch valve, so that the pneumatic switch valve is not blocked to cause poor sealing.
Limestone blanking enters the material boot through the air exhaust chamber and the second-stage rotary discharger in sequence, the air exhaust chamber caches the limestone blanking, and the top of the hopper is provided with a filter drum for discharging return air of an air supply system caused by poor sealing of the second-stage rotary discharger.
A pressure detection instrument is arranged between the outlet of the Roots blower and the material boot air inlet, the wind resistance of the conveying system can be fed back in real time by pressure detection, and the pressure is small, which indicates that the limestone is not smoothly discharged and the conveying pipeline is empty and blown; the pressure is larger, which shows that the conveying resistance is large, and the pipeline tends to be blocked.
Set up venturi and check valve between roots's fan and the material boots air inlet, the amount of wind and the air current that the venturi can stably get into the material boots, and the check valve can prevent that the material from causing the trouble to roots's fan backward flow when shutting down or pneumatic conveying system is unusual in the material boots.
The conveying pipeline is made of wear-resistant materials and is provided with the elbow with large curvature radius, so that the abrasion of the pipeline during material conveying is reduced; meanwhile, the tail end of the conveying pipeline is connected with the discharging chute, so that the charging speed of the limestone is reduced, and the scouring effect of the limestone on refractory materials in the furnace is avoided when granular materials are adopted.
Simultaneously opening a limestone blanking equipment set and an air supply equipment set to serve as a conveying device of a desulfurizer of the incinerator; the limestone blanking equipment set can be closed, and the air supply equipment set can be opened to be used as an auxiliary air blowing device for combustion-supporting air of the incinerator.
As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the spirit and scope of the present invention. Therefore, such modifications are also all included in the scope of protection of the present invention.

Claims (10)

1. The utility model provides an incinerator desulfurized limestone conveyor which characterized in that: the limestone discharging and metering part comprises a limestone storage bin, a gate valve at the bottom of the limestone storage bin, a primary rotary discharger, a pneumatic switch valve, a flexible connection, a weightlessness scale, an air exhaust chamber, a secondary rotary discharger and a material boot, wherein the bottom of the limestone storage bin is connected with the gate valve, the other end of the gate valve is connected with an inlet of the primary rotary discharger, an outlet of the primary rotary discharger is connected with the pneumatic switch valve, a feed inlet and a discharge outlet of the weightlessness scale are respectively connected with the other end of the pneumatic switch valve and an inlet of the air exhaust chamber through the flexible connection, an outlet of the air exhaust chamber is connected with the secondary rotary discharger, the other end of the secondary rotary discharger is connected with a feed inlet of the material boot, the air conveying part comprises a Roots blower, a pressure detecting instrument, a Venturi, a check valve, the material boot, the pneumatic switch valve, a conveying pipeline and a discharge chute, the pressure detecting instrument is sequentially connected between the outlet of the Roots, The discharge port of the material boot is respectively connected with the pneumatic switch valve and the discharge chute through a conveying pipeline, and the tail end of the discharge chute is connected with the incinerator.
2. The limestone conveying device for desulfurization of incinerator according to claim 1, characterized in that the weightless scale has a buffering hopper, the stirring motor and the high material level/material weight switch are connected in the buffering hopper, the bottom of the buffering hopper is connected with the screw conveyer, the outlet of the screw conveyer is connected with one end of the flexible connection, and the other end of the flexible connection is connected with the inlet of the extraction chamber.
3. The limestone conveying device for desulfurization of incinerator according to claim 1, characterized in that the discharge port of the material boot is connected with the discharge chute through a wear-resistant conveying pipe.
4. A limestone conveying method for desulfurization of an incinerator is characterized by comprising the following steps: the limestone materials are discharged from the limestone storage bin, the discharged limestone materials sequentially pass through the gate valve, the primary rotary discharger, the pneumatic switch valve and the buffering hopper of the weightlessness scale, the limestone materials are stored and weighed in the buffering hopper, when the limestone of the buffering hopper reaches a certain amount, the high material level/material weight switch of the weightlessness scale is triggered, the primary rotary discharger and the pneumatic switch valve are interlocked and closed in sequence,
the stirring motor of the buffer hopper continuously rotates to prevent the limestone materials (limestone powder/particles) from bridging in the hopper and feeding the limestone materials through the screw conveyer at the bottom of the buffer hopper,
limestone materials enter the air pumping chamber through a screw conveyer of a weightlessness scale, then enter the secondary rotary discharger and the material boot from the bottom of the air pumping chamber in sequence, the limestone materials in the material boot wait for the air supply system to convey the limestone materials to the incinerator,
the outlet of the Roots blower is sequentially provided with a pressure detection instrument, a Venturi and a check valve, airflow at the outlet of the Roots blower enters the material boot after being stabilized in pressure and stabilized in flow after passing through the Venturi, the airflow carries out dilute-phase positive pressure pneumatic conveying on limestone inside the material boot, the limestone enters the discharging chute through a pneumatic switch valve and a conveying pipeline, and the limestone enters the incinerator after being decelerated and stabilized in flow inside the discharging chute.
5. The method for transporting limestone to incinerators for desulfurization according to claim 4, wherein the weight loss scale monitors and adjusts the limestone dosage in real time; the gravity unloading of dispersion and even lime stone material when one-level rotatory tripper starts, can block the blanking of lime stone when one-level rotatory tripper is closed.
6. The method for transporting limestone to an incinerator for desulfurization according to claim 4, characterized in that the outlet of the primary rotary discharger is connected to a pneumatic switch valve, and the pneumatic switch valve is opened before the primary rotary discharger when the discharge is opened; when the blanking is stopped, the first-stage rotary discharger is closed before the pneumatic switch valve, so that the pneumatic switch valve is not blocked to cause poor sealing.
7. The method for transporting limestone to be desulfurized by an incinerator according to claim 4, characterized in that the limestone is fed into the material shoe through the suction chamber and the secondary rotary discharger in sequence, the suction chamber buffers the limestone feed, and the filter cartridge is arranged at the top of the hopper to discharge return air of the pneumatic system caused by the poor sealing of the secondary rotary discharger.
8. The method for transporting limestone to incinerate an incinerator for desulfurization, as claimed in claim 4, wherein a pressure detecting instrument is provided between the outlet of the Roots blower and the inlet of the material boot, the pressure detection can feed back the wind resistance of the transporting system in real time, the pressure is small, which indicates that the limestone is not discharged smoothly and the transporting pipeline is blown empty; the pressure is larger, which shows that the conveying resistance is large, and the pipeline tends to be blocked.
9. The method for transporting limestone to incinerate a boiler for desulfurization according to claim 4, wherein a venturi and a check valve are provided between the Roots blower and the material boot air inlet, the venturi stabilizes the air volume and air flow entering the material boot, and the check valve prevents the material in the material boot from flowing back to the Roots blower to cause failure when the machine is stopped or the air supply system is abnormal.
10. The method for using the limestone conveying device for desulfurization of the incinerator according to the claim 1, characterized in that the limestone feeding equipment group and the air-blowing equipment group can be simultaneously opened as the conveying device of the desulfurizer of the incinerator; or closing the limestone discharging equipment set, only opening the air supply equipment set as an auxiliary air blowing device of combustion-supporting air of the incinerator, wherein the limestone discharging equipment set comprises: the device comprises a gate valve, a primary rotary discharger, a pneumatic switch valve, a weightlessness scale, an air extraction chamber, a secondary rotary discharger and a material boot which are sequentially connected with the lower part of a limestone storage bin; air conveying equipment set: comprises a Roots blower, a pressure detecting instrument, a Venturi, a check valve, a material boot, a pneumatic switch valve, a conveying pipeline and a discharging chute.
CN202110019900.0A 2021-01-07 2021-01-07 Limestone conveying device and method for desulfurization of incinerator Pending CN112744595A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114940382A (en) * 2022-06-23 2022-08-26 山东保蓝环保工程有限公司 Sodium bicarbonate ultrafine powder blanking and conveying system in flue gas dry desulphurization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114940382A (en) * 2022-06-23 2022-08-26 山东保蓝环保工程有限公司 Sodium bicarbonate ultrafine powder blanking and conveying system in flue gas dry desulphurization

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