CN113801699A - Lock hopper, lock hopper pressurization system and powder pressurization conveying system - Google Patents
Lock hopper, lock hopper pressurization system and powder pressurization conveying system Download PDFInfo
- Publication number
- CN113801699A CN113801699A CN202111191211.4A CN202111191211A CN113801699A CN 113801699 A CN113801699 A CN 113801699A CN 202111191211 A CN202111191211 A CN 202111191211A CN 113801699 A CN113801699 A CN 113801699A
- Authority
- CN
- China
- Prior art keywords
- lock hopper
- pressure
- lock
- pipeline
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000843 powder Substances 0.000 title claims abstract description 142
- 238000007599 discharging Methods 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000013589 supplement Substances 0.000 claims description 51
- 238000005303 weighing Methods 0.000 claims description 50
- 238000010926 purge Methods 0.000 claims description 43
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 40
- 230000001105 regulatory effect Effects 0.000 claims description 34
- 239000002184 metal Substances 0.000 claims description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 30
- 230000001276 controlling effect Effects 0.000 claims description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 239000001569 carbon dioxide Substances 0.000 claims description 18
- 230000009467 reduction Effects 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 12
- 239000000945 filler Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 101
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 40
- 239000003245 coal Substances 0.000 description 18
- 238000002309 gasification Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 8
- 238000000197 pyrolysis Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 5
- 239000012857 radioactive material Substances 0.000 description 5
- 238000010408 sweeping Methods 0.000 description 5
- 239000012159 carrier gas Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000000941 radioactive substance Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
- C10J3/506—Fuel charging devices for entrained flow gasifiers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention provides a lock hopper, a lock hopper pressurization system and a powder pressurization conveying system, and based on the technical scheme provided by the invention, the lock hopper pressurization system and the powder pressurization conveying system are beneficial to pressurizing CO2And the environment is protected. The lock hopper provided by the invention is provided with a feeding port, a discharging port and a pressure relief port, wherein the discharging port is arranged at the bottom of the lock hopper, an inflation cone for introducing pressurized gas into the lock hopper is arranged on the discharging port, an air inlet of the pressurized gas is arranged on the inflation cone, and a material channel for outputting materials in the lock hopper from the discharging port of the lock hopper to the outside is arranged in the inflation cone.
Description
Technical Field
The invention relates to a powder material, in particular to a powder material pressurized conveying technology, and particularly relates to a lock hopper, a lock hopper pressurizing system and a powder material pressurized conveying system for pressurized dense-phase conveying of powder materials.
Background
In the existing coal reserves in China, low-rank metamorphic coal with high water content and a large amount of volatile matters accounts for the majority. In order to utilize the coal resources in a grading and quality-based manner, a low-temperature pyrolysis technology is generally adopted, tar with high coal added value is extracted (with coal gas) at the temperature of 400-900 ℃, and the residual solid is coke. The coke produced by the large particle pyrolysis technology is often used as a reducing agent in the steel industry, but the oil yield of the technology is slightly low. In recent years, with the development of small-particle fast pyrolysis technology, coal powder is mostly adopted as a pyrolysis raw material, the oil yield is high, but the generated coke powder has small particle size, is easy to spontaneously combust and difficult to transport in a long distance, and needs to be directly converted on site.
The temperature of the coke powder leaving the pyrolysis is generally 400-900 ℃ (the water content is close to 0), then medium-low pressure steam is generated as a byproduct through heat exchange, but the continuous cooling below 200 ℃ can only be completed by using circulating cooling water, so that the equipment investment and the water consumption are large, the gasification device is required to receive the coke powder at the temperature above 200 ℃, and the dry powder entrained flow gasification is the most suitable hot coke powder conversion mode in consideration of the activity of the coke powder.
The dry powder entrained-flow bed gasification is generally pressurized gasification, and pulverized coal (coke powder) is pressurized by a pulverized coal pressurization system and then metered into a gasification furnace through a dense-phase conveying pipeline. The pulverized coal pressurization system generally comprises three parts, namely a normal-pressure powder bin, a lock hopper and a high-pressure charging tank, wherein the lock hopper is used as a key device for conveying low-pressure powder to the high-pressure charging tank and is the most complex and important part of the whole powder conveying system. The feeding of coke powder at the temperature of more than 200 ℃ puts more strict requirements on the operation of the lock hopper device.
The lock hopper needs to adopt inert gas for pressurizing, and CO is mostly adopted2As pressurized gas (carrier gas), generally coming from the downstream purification section of a chemical plant, influenced by its process (low-temperature methanol wash), CO2Wherein the concentration of the methanol is 150-300mg/m3. The pressurizing gas needs to be completely discharged when the lock hopper is depressurized, and the national emission standard of the methanol in the discharged gas is less than 50mg/m3The requirement on the environmental protection of the process is provided, and the currently adopted front end of gasification is cleaned and removed with methanol or cleaned and removed during gasification and dischargeThe investment cost of equipment and devices for methanol and the like and the later operating cost are both higher.
For the measurement of the powder material level in the lock hopper, the prior art generally adopts a radioactive material level meter, radioactive materials Co-60 and Se-137 are used as measuring media, and the half life of the two materials is 5-10 years, namely the radioactive materials in the material level meter need to be replaced every 5-10 years. The changed radioactive substance needs professional setting for storage management, so that the use cost of the radioactive material level meter is very high, the subsequent treatment of the changed radioactive substance is very difficult, and the environmental protection is not facilitated. In normal use, radioactive level gauges can produce radiation to a certain extent around the equipment, adversely affecting personnel safety. Therefore, the development of a simple, reliable, safe and environment-friendly powder material level measuring mode with a lock hopper is also needed urgently by a powder conveying system.
Patent CN111362002A discloses a pneumatic conveying system for high-temperature air of pulverized coal, which proposes a conveying method for high-temperature pulverized coal, but this method can only be used in low-pressure systems, and is not suitable for the mainstream high-pressure entrained-flow gasification technology in the market.
Patent CN202708582U is a coal powder lock hopper pressurizing gas system, proposes a coal powder lock hopper pressurizing method under the condition that nitrogen is used as carrier gas, and does not relate to the use of CO2 as carrier gas and lock hopper under the condition of high temperature, and does not relate to the measurement of lock hopper material level.
Patent CN205556580U is an improved pulverized coal pressurization control system, which improves the existing pulverized coal lock bucket pressurization, but does not relate to the measurement of the lock bucket material level and the removal of methanol in the carrier gas for the use of high-temperature coke powder, and is not suitable for the transportation of high-temperature coke powder.
In summary, for dry powder gasification, especially for gasification of high-temperature hot coke powder, a lock hopper pressurizing technology meeting new environmental requirements while meeting high-temperature use is urgently needed.
Disclosure of Invention
In view of the above, the present invention provides a lock hopper, a lock hopper pressurization system and a powder pressurization conveying system, which are based on the technology provided by the present inventionThe technical proposal is favorable for pressurizing gas CO2And the environment is protected.
The invention provides a lock hopper which is provided with a feeding port, a discharging port and a pressure relief port, wherein the discharging port is arranged at the bottom of the lock hopper, an inflation cone for introducing pressurized gas into the lock hopper is arranged on the discharging port, an air inlet of the pressurized gas is arranged on the inflation cone, and a material channel for outputting materials in the lock hopper from the discharging port of the lock hopper to the outside is arranged in the inflation cone.
Preferably, the inflatable cone comprises a pressure-bearing shell, a sintered metal net and a metal plate for supporting the sintered metal net;
the air inlet of the inflation cone is arranged on the pressure-bearing shell, the sintering metal net is arranged in the inner cavity of the pressure-bearing shell, the sintering metal net is integrally surrounded to form the material channel, the metal plate is arranged between the inner wall of the pressure-bearing shell and the sintering metal net, and a plurality of air holes are formed in the metal plate;
further preferably, the sintered metal mesh comprises a plurality of layers of laminated sintered metal mesh.
The invention also provides a lock hopper pressurization system, comprising,
the lock hopper described above;
the air inlet of the inflation cone of the lock hopper is connected with the carbon dioxide pressurization air source through a pressurization air inlet pipeline, and a pressurization air flow control valve is arranged on the pressurization air inlet pipeline;
preferably, the lock hopper pressurization system further comprises an inflation cone pressurization control unit, the inflation cone pressurization control unit comprises an inflation cone pressurization control module for controlling the opening of the pressurization gas flow control valve, a flowmeter for detecting the pressurization gas flow is further arranged on the pressurization gas inlet pipeline, and the inflation cone pressurization control module is in communication connection with the flowmeter;
preferably, the lock fill pressurization system further comprises a pipeline air supplement unit for supplementing pressurized air into the lock fill, the pipeline air supplement unit comprises a pipeline air supplement device arranged at the position of the material channel outlet of the air supplement cone and a pipeline air supplement pipeline connected between the pipeline air supplement device and the pressurized air inlet pipeline, and a pipeline air supplement valve and a pipeline air supplement flow limiting pore plate are arranged on the pipeline air supplement pipeline.
The invention also provides a method for carrying out lock bucket pressurization by using the lock bucket pressurization system, which comprises the following steps:
inputting the pressurized gas in the carbon dioxide pressurized gas source to the gas inlet of the inflation cone through the pressurized gas inlet line, so as to pressurize the lock hopper; preferably, the opening degree of the pressurized gas flow control valve is controlled by an inflation cone inflation control module of an inflation cone inflation control unit so as to regulate and control the pressurized gas flow introduced into the inflation cone through the pressurized gas inlet pipeline;
preferably, the pipeline air supplement unit is used for supplementing the pressurized air required by the pressurization of the lock bucket into the lock bucket.
The invention also provides a powder pressurizing and conveying system, which comprises the lock hopper pressurizing system, a normal-pressure powder bin and a high-pressure feeding tank;
the discharge port of the normal-pressure powder bin is connected with the feed inlet of the lock hopper through a lock hopper feed pipeline, and a lock hopper inlet valve is arranged on the lock hopper feed pipeline;
the material channel of the inflation cone of the lock hopper is connected with the feeding port of the high-pressure feeding tank through a lock hopper discharge pipeline, and a lock hopper outlet valve is arranged on the lock hopper discharge pipeline;
the pressure relief port of the lock hopper is connected with the normal-pressure powder bin through a pressure relief pipeline, and a lock hopper emptying adjusting valve is arranged on the pressure relief pipeline;
preferably, the powder pressurized conveying system further comprises a normal-pressure powder bin weighing unit for detecting the weight of the normal-pressure powder bin before and after discharging and controlling the opening and closing of the lock hopper inlet valve according to the comparison result of the weight difference value of the normal-pressure powder bin and the preset lock hopper load;
preferably, the powder pressurized conveying system further comprises a high-pressure feeding tank weighing unit for detecting the weight of the high-pressure feeding tank before and after feeding and controlling the opening and closing of the lock hopper outlet valve according to the comparison result of the weight difference of the high-pressure feeding tank before and after feeding and the preset lock hopper load;
preferably, the powder pressurized conveying system further comprises a lock hopper emptying control unit for controlling the opening of the lock hopper emptying adjusting valve to regulate and control the pressure in the lock hopper;
preferably, the powder pressurized conveying system further comprises a valve cooling and purging unit for inputting a purge gas to the lock hopper inlet valve and the lock hopper outlet valve to cool the filler in the valve.
Furthermore, a pipeline air supplement device of the pipeline air supplement unit is arranged between the material channel of the air supplement cone and the lock hopper discharge pipeline.
Further, the normal-pressure powder bin weighing unit comprises a first weighing element and a lock hopper inlet valve control module, wherein the first weighing element is used for detecting the weight of the normal-pressure powder bin before and after blanking, the lock hopper inlet valve control module is in communication connection with the first weighing element, and is used for calculating the weight difference value of the normal-pressure powder bin before and after blanking according to the weight output by the first weighing element and controlling the opening and closing of the lock hopper inlet valve according to the comparison result of the weight difference value and the preset lock hopper load;
the high-pressure feeding tank weighing unit comprises a second weighing element and a locking hopper outlet valve control module, the second weighing element is used for detecting the weight of the high-pressure feeding tank before and after feeding, the locking hopper outlet valve control module is in communication connection with the second weighing element, and the locking hopper outlet valve control module is used for calculating the weight difference of the high-pressure feeding tank before and after feeding according to the weight output by the second weighing unit and controlling the opening and closing of the locking hopper outlet valve according to the weight difference and a comparison result of a preset locking hopper load.
Furthermore, the lock bucket inlet valve and the lock bucket outlet valve are respectively provided with a purging port for introducing purging gas to cool the filler in the valve; the valve cooling sweeps the unit including connect in carbon dioxide pressurization gas air supply with first sweeping gas pipeline between the mouth of sweeping of lock fill inlet valve, connect in carbon dioxide pressurization gas air supply with second sweeping gas pipeline between the mouth of sweeping of lock fill outlet valve, be equipped with sweep gas current-limiting orifice plate on first sweeping gas pipeline and the second sweep gas pipeline respectively.
Further, lock fill unloading the control unit including being used for regulating and control the lock fill unloading governing valve control module of lock fill unloading governing valve aperture, lock fill unloading governing valve control module and the manometer on the lock fill, the manometer communication connection on the high pressure feed jar.
Furthermore, pipeline stress relieving structures are respectively arranged on the lock hopper feeding pipeline, the lock hopper discharging pipeline and the pressure relief pipeline;
preferably, the pipeline stress relieving structure comprises corrugated pipes respectively arranged on a lock hopper feeding pipeline, a lock hopper discharging pipeline and a pressure relief pipeline, and further comprises a single hinge arranged between the front side and the rear side of the corrugated pipe along the axial direction of the corrugated pipe.
The invention also provides a powder pressurizing and conveying method based on the powder pressurizing and conveying system, which comprises the following steps:
1) a powder collecting stage: opening the inlet valve of the lock hopper, and discharging materials from the normal-pressure powder bin to the lock hopper;
2) and (3) a pressurizing stage: after the normal-pressure powder bin finishes discharging, pressurized gas in the carbon dioxide pressurized gas source is filled into the lock hopper through the pressurized gas inlet pipeline through the gas inlet of the inflation cone, so that the lock hopper is pressurized;
3) powder feeding stage: regulating and controlling the lock hopper emptying regulating valve to regulate the pressure in the lock hopper and make the pressure difference between the lock hopper and the high-pressure feed tank meet the preset pressure difference requirement; then opening the outlet valve of the lock hopper, and starting feeding by the high-pressure feeding tank;
4) a pressure relief stage: after the high-pressure feeding tank finishes feeding, adjusting the lock hopper emptying adjusting valve to release the pressure in the lock hopper to normal pressure;
preferably, before starting step 1), purge gas is input to the lock bucket inlet valve and the lock bucket outlet valve through the valve cooling purge unit;
preferably, in the step 1), the weight of the normal-pressure powder bin before and after blanking is detected by the normal-pressure powder bin weighing unit, the weight difference value between the detected weight and the weight of the normal-pressure powder bin before and after blanking is compared with a preset lock hopper load, and when the weight difference value is consistent with the preset lock hopper load, the lock hopper inlet valve is closed;
preferably, in the step 2), in the process of pressurizing the lock hopper, the opening degree of the pressurized gas flow control valve is controlled by an inflation cone pressurizing control module of the inflation cone pressurizing control unit so as to regulate and control the pressurized gas flow introduced into the inflation cone through the pressurized gas inlet pipeline; preferably, a pipeline air supplement unit is used for supplementing pressurized air into the lock hopper through the pipeline air supplement device;
preferably, the lock hopper emptying control unit comprises a lock hopper emptying adjusting valve control module for regulating and controlling the opening of the lock hopper emptying adjusting valve, and the lock hopper emptying adjusting valve control module is in communication connection with a pressure gauge on the lock hopper and a pressure gauge on the high-pressure feeding tank; in the step 3), the lock hopper emptying regulating valve control module calculates pressure difference between the lock hopper and the high-pressure feeding tank according to pressure data respectively output by a pressure gauge on the lock hopper and a pressure gauge on the high-pressure feeding tank, and regulates and controls the opening of the lock hopper emptying regulating valve according to a comparison result of the pressure difference and a preset pressure difference requirement so as to regulate the pressure in the lock hopper and enable the pressure difference between the lock hopper and the high-pressure feeding tank to meet the preset pressure difference requirement; in the step 4), the opening of the lock hopper vent control valve is regulated and controlled by the lock hopper vent control unit so that the pressure in the lock hopper is relieved to the normal pressure, preferably, the lock hopper vent control valve control module calculates a lock hopper pressure reduction rate according to pressure data output by a pressure gauge on the lock hopper and regulates the opening of the lock hopper vent control valve so that the lock hopper is relieved to the normal pressure according to the preset lock hopper pressure reduction rate requirement according to a comparison result of the lock hopper pressure reduction rate and the preset lock hopper pressure reduction rate requirement;
preferably, in step 3), the weight of the high-pressure feeding tank before and after feeding is detected by a high-pressure feeding tank weighing unit, the weight difference between the weight of the high-pressure feeding tank and the weight of the high-pressure feeding tank is compared with a preset lock bucket load, and when the weight difference is consistent with the preset lock bucket load, the lock bucket outlet valve is closed;
the technical scheme provided by the invention is particularly suitable for dense phase pressurized conveying of the coke powder at the temperature of more than 200 ℃.
The technical scheme provided by the invention has the following beneficial effects:
1. the invention improves the pressurizing structure of the lock hopper, and the discharge hole at the bottom of the lock hopper is provided with the inflating cone for inflating pressurized gas, so that the pressurized gas CO is pressurized2Introducing pressurized gas CO from the conical bottom of the lock hopper2The powder such as coal powder and high-temperature coke powder in the lock hopper passes through the lock hopper, and CO is adsorbed by the carbon2Most (for example, more than 95 percent) of methanol is adsorbed and removed, a methanol removing system is not needed to be added, and the CO of the pressurized gas is greatly reduced2Investment and cost for removing methanol, and is beneficial to realizing standard emission of vent gas during lock bucket pressure relief<50ppm)。
2. In the preferred scheme, a normal-pressure powder bin weighing unit and a high-pressure feeding tank weighing unit are arranged in a powder pressurizing and conveying system, the weighing change of the normal-pressure powder bin and the high-pressure feeding tank is compared with the preset lock hopper load, the feeding and discharging conditions of the lock hopper are monitored, the opening and closing of a lock hopper inlet valve and a lock hopper outlet valve are controlled, and the feeding and discharging of the lock hopper are regulated and controlled. Thus, the weighing element is prevented from being directly arranged on the lock hopper, and the lock hopper is large in vibration, large in up-down expansion and easy to influence the measuring accuracy and the service life of equipment due to the fact that the lock hopper is used for loading and unloading materials and pressure charging and discharging. By changing the lock hopper material level measuring mode and abandoning the radioactive material level meter, the safety and the anucleation of the whole powder conveying system are realized, the system operation and maintenance cost is effectively reduced, and the environmental protection safety is improved.
3. In the preferred scheme, a valve cooling and purging unit is arranged to protect valve fillers in valves such as a lock hopper inlet valve, a lock hopper outlet valve and the like, the requirement of the valves on the fillers is reduced, the conventional valves can be normally used in a high-temperature coke powder environment, the equipment investment is reduced, and the problem of conveying high-temperature coke powder, particularly the coke powder above 200 ℃, is solved.
Drawings
FIG. 1 is a schematic view of a pressurized powder delivery system according to one embodiment;
FIG. 2 is a schematic top view of the inflation cone;
FIG. 3 is a schematic view of the structure of a metal plate in the inflatable cone;
FIG. 4 is a schematic plan view of a sintered wire mesh;
FIG. 5 is a schematic structural view of a pipe stress relief structure;
FIG. 6 is a schematic diagram illustrating the location of purge ports in one embodiment.
Detailed Description
In order to better understand the technical solution of the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Referring to fig. 1, the present invention provides an improved bucket 1. This lock fill 1 is equipped with the pan feeding mouth with current buggy lock fill is similar, is equipped with the discharge gate in the bottom, still is equipped with the pressure release mouth. The existing lock hopper is improved, an inflation cone 15 is arranged on a discharge hole of the lock hopper 1, and the inflation cone 15 is configured to be used for introducing pressurized gas, particularly carbon dioxide pressurized gas, into the lock hopper 1; an air inlet for pressurized air to enter is arranged on the air charging cone 15, a material channel 30 is arranged in the air charging cone 15 and is used for outputting materials (such as coal dust or coke powder) in the lock hopper 1 from a bottom discharge hole of the lock hopper 1 to the outside, such as outputting the materials to a downstream high-pressure feed tank 3.
When the lock hopper 1 needs to be pressurized, pressurized gas such as carbon dioxide pressurized gas enters from an inflation cone 15 at the bottom of the lock hopper 1. In the case of a pulverized material such as coke powder, which is produced by pyrolysis of coal, volatile components and most of moisture of the coal are stripped from the coal during the pyrolysis, and what remains are char and ash, which are main components of the coke powder, the particle size of the coke powder is small and the porosity is large. Coke powder to CO2The methanol in the gas has good adsorption effect. CO to lock the bucket2The pressurizing gas is introduced through the cone bottom and passes through the powder, the degree of contact between the pressurizing gas and the carbon surface of the powder is high, the adsorption force is large, and the adsorption capacity of the powder (carbon) on methanol is strong; tong (Chinese character of 'tong')Adsorbing CO by carbon2Most (e.g. 95% or more) CH3OH is adsorbed and removed to ensure that the lock bucket emptying gas achieves the emission reaching the standard (<50ppm)。
Further, the invention improves the structure of the inflation cone to facilitate the pressurization from the cone part of the lock hopper. Specifically, referring to fig. 2-4, the gas-filled cone 15 specifically includes a pressure-bearing housing 27, a sintered metal mesh 29, and a metal plate 28. An air inlet of the inflation cone 15 is arranged on the pressure-bearing shell 27; a sintered metal mesh 29 is arranged in the inner cavity of the pressure-bearing shell 27, and as shown in FIG. 2, the sintered metal mesh 29 integrally surrounds to form a material passage 30; a metal plate 28 is provided between the inner wall of the pressure-bearing housing 27 and the sintered metal mesh 29 to provide a supporting function for the sintered metal mesh 29. The metal plate 28 is provided with a plurality of air holes 31, for example, 1500-2000 air holes with a hole diameter of 10-20mm are provided. Specifically, the sintered metal mesh 29 is woven by a plurality of layers of laminated sintered metal wire meshes 32, and has both strength and overall toughness; for example, the sintered wire mesh 29 may be woven from tens of layers of 1-2mm sintered wire mesh 32, with the mesh spacing of the sintered wire mesh 32 being, for example, 5-10 mm. Compared with the traditional sintered metal plate, the pressure difference resistance of the structure is improved from 1.0MPa to more than 3.0MPa, the ventilation rate is improved by more than 100%, and the requirement of inflating the lock hopper cone part can be effectively met.
Based on the lock hopper, the invention also provides a lock hopper pressurization system and a method for carrying out lock hopper pressurization by using the lock hopper pressurization system. Referring to fig. 1, the lock hopper pressurization system comprises the lock hopper 1 described above and a carbon dioxide pressurization gas source 5. The air inlet of the inflation cone 15 of the lock hopper 1 is connected with the carbon dioxide pressurized air source 5 through a pressurized air inlet pipeline 6, and a pressurized air flow control valve 13 is arranged on the pressurized air inlet pipeline 6. When the lock hopper 1 needs to be pressurized, the pressurized gas flow control valve 13 is opened, and pressurized gas in the carbon dioxide pressurized gas source 5 is input to the gas inlet of the inflation cone 15, so that the lock hopper 1 is pressurized.
Furthermore, the lock hopper pressurization system is also provided with an inflation cone pressurization control unit. Specifically, the inflation cone pressurization control unit comprises an inflation cone pressurization control module for controlling the opening degree of the pressurized gas flow control valve 13, a flowmeter 24 for detecting the flow of the pressurized gas on the pipeline is further arranged on the pressurized gas inlet pipeline 6, and the inflation cone pressurization control module is in communication connection with the flowmeter 24. In the process of pressurizing the lock hopper 1, the opening degree of the pressurized airflow control valve 13 can be controlled by an inflation cone pressurizing control module of the inflation cone pressurizing control unit so as to regulate and control the pressurized airflow which is introduced into the inflation cone 15 through the pressurized air inlet pipeline 6. For example, in some embodiments, for example, the amount of pressurized gas flow required for pressurizing the lock hopper at the existing pressure is calculated in advance according to the target pressure required for pressurizing the lock hopper 1 and the time required for pressurizing (in some embodiments, this calculation may also be performed by, for example, an inflation cone pressurizing control module, which may also be configured to be in communication connection with a pressure gauge on the lock hopper to receive information of the detected lock hopper pressure), the inflation cone pressurizing control module adjusts the opening degree of the pressurized gas flow control valve 13 according to the calculated amount of pressurized gas flow required for pressurizing the lock hopper so that the amount of pressurized gas flow on the pressurized gas inlet line meets the calculated amount of pressurized gas flow required for pressurizing the lock hopper, for example, the inflation cone inflation control module regulates the opening degree of the pressurized airflow control valve 13 according to the comparison result of the flow data output by the flow meter 24 on the pressurized air inlet pipeline and the pressurized airflow requirement required by lock hopper inflation. For example, in some embodiments, by regulating the opening of the pressurized airflow control valve 13, the volume flow rate of the lock hopper pressurized air entering the lock hopper through the lock hopper inflation cone 15 is kept consistent, and according to the relation Δ P between the volume flow rate V and the differential pressure Δ P being V ^2, when the volume flow rate is kept unchanged, the differential pressure is also kept unchanged, so that the differential pressure borne by the lock hopper inflation cone 15 in the pressurization process is kept consistent, the fluctuation of the operation condition of the pressure-bearing element is kept small, and the long-period operation of the equipment is facilitated.
Further, the lock hopper pressurization system further comprises a pipeline air supply unit for supplying pressurized air into the lock hopper 1. Specifically, the pipeline air supplement unit comprises a pipeline air supplement device 16 (one end of the pipeline air supplement device 16 is communicated with the material channel 30) arranged at the outlet of the material channel 30 of the air supplement cone 1 and a pipeline air supplement pipeline 7 connected between the pipeline air supplement device 16 and the pressurized air inlet pipeline 6, and a pipeline air supplement valve 22 and a pipeline air supplement flow limiting orifice plate 23 are arranged on the pipeline air supplement pipeline 7. Specifically, the lining pipe of the pipeline air supply device 16 is made of sintered metal, and a pressurized air inlet for introducing pressurized air is provided on the pipeline air supply device and is connected with the pipeline air supply line 7 through the pressurized air inlet. Through setting up the pipeline tonifying qi unit, start the pipeline tonifying qi unit as required, can cooperate according to the needs that the lock was fought to pressurize to inflate awl 15 and supply the required pressurization gas to lock 1 fill on the one hand, on the other hand, establish pipeline tonifying qi ware 16 in the material passageway 30 exit of inflating awl 15, be connected (both communicate) with pipeline (for example lock ejection of compact pipeline 9) of low reaches again through this pipeline tonifying qi ware 16, can fluidize the powder that exists in the pipeline, make the unloading of lock 1 downstream high pressure feed tank 3 more smooth and easy. For example, in some embodiments, during the lock hopper pressurization (or referred to as lock hopper pressurization), the flow rate of the pressurized gas required by the lock hopper pressurization is calculated in advance according to a target pressure (e.g. 4.5-5.0MPa) required by the lock hopper 1, the pressurized gas is charged into the lock hopper 1 through the lock hopper inflation cone 15, when the lock hopper pressure is charged to be close to the target pressure, e.g. to be 4.0MPa, the pipeline gas supplement unit can be synchronously put into use, the pipeline gas supplement valve 22 is opened, and the opening degree of the pressurized gas flow control valve 13 is adjusted to reduce the flow rate of the pressurized gas charged through the gas inlet of the inflation cone 15, so as to avoid over-inflation; when the pipeline air supplement unit is used, the pipeline air supplement valve 22 is opened to supplement pressurized air into the lock hopper 1, the target pressure is pressurized, the pressurized air on the pipeline air supplement pipeline 7 is limited by arranging the pipeline air supplement limiting orifice plate 23 on the pipeline air supplement pipeline 7, and the flow of the pressurized air on the pipeline air supplement pipeline 7 is controlled to be about 200 and 400kg/h, for example.
Based on the lock hopper and the lock hopper pressurization system, the invention also provides a powder pressurization conveying system and a method for performing powder pressurization conveying by using the powder pressurization conveying system. Referring to fig. 1, the powder pressurized conveying system comprises the lock hopper pressurizing system, a normal-pressure powder bin 2 and a high-pressure feeding tank 3. According to the production field condition, a powder conveying bin 4 can be arranged and is connected with a feeding port of the normal-pressure powder bin 2 through a pipeline.
The discharge port of the normal-pressure powder bin 2 is connected with the feed port of the lock hopper 1 through a lock hopper feed pipeline 8, and a lock hopper inlet valve 17 is arranged on the lock hopper feed pipeline 8; the material channel 30 of the inflation cone 15 of the lock hopper 1 is connected with the material inlet of the high-pressure feeding tank 3 through a lock hopper discharge pipeline 9, and a lock hopper outlet valve 18 is arranged on the lock hopper discharge pipeline 9; the pressure relief opening of the lock hopper 1 is connected with the normal-pressure powder bin 2 through a pressure relief pipeline 10, and a lock hopper emptying adjusting valve 19 is arranged on the pressure relief pipeline 10. Preferably, a lock hopper emptying shut-off valve 20 is also arranged on the pressure relief pipeline 10.
In a preferred embodiment, the powder pressurized conveying system further comprises a normal-pressure powder bin weighing unit, a high-pressure feeding tank weighing unit, a lock hopper emptying control unit and a valve cooling and purging unit.
The normal-pressure powder bin weighing unit is used for detecting the weight of the normal-pressure powder bin 2 before and after discharging and controlling the opening and closing of the lock hopper inlet valve 17 according to the comparison result of the weight difference value of the normal-pressure powder bin 2 before and after discharging (namely the weight difference value before and after discharging) and the preset lock hopper load (namely the preset lock hopper powder collecting weight); for example, in the powder collecting stage of the lock hopper, when the weight difference between the weight before and after the powder is collected in the normal-pressure powder bin 2 is consistent with the preset load of the lock hopper, which indicates that the powder is collected in the lock hopper 1, the inlet valve 17 of the lock hopper is closed, and the powder is stopped being discharged from the normal-pressure powder bin 2. Specifically, the normal-pressure powder bin weighing unit comprises a first weighing element (such as a gravity sensor/a weighing sensor) 25 for respectively detecting the weight of the normal-pressure powder bin 2 before and after discharging, and a locking inlet valve control module in communication connection with the first weighing element 25, wherein the locking inlet valve control module is used for controlling the locking inlet valve control module according to the weight W of the normal-pressure powder bin 2 before discharging output by the first weighing element 25CB1And weight W after blankingCB2Calculating to obtain the weight difference W between the twoCB1-WCB2And according to the weight difference and the preset lock bucket load WLHAs a result of the comparison, the opening and closing of the inlet valve 17 of the lock hopper is controlled, for example, during the powder collecting stage of the lock hopper when W isLH＝WCB1-WCB2And if the powder collection of the lock hopper 1 is judged to be finished, controlling the lock hopper inlet valve 17 to be closed.
The high-pressure feeding tank weighing unit is used for detecting that the high-pressure feeding tank 3 is feedingThe weight before and after feeding controls the opening and closing of the lock hopper outlet valve 18 according to the weight difference of the weight before and after feeding (namely the weight difference before and after feeding) and the comparison result of the preset lock hopper load; for example, in the powder discharging stage of the lock hopper 1, when the weight difference between the high-pressure feeding tank 3 before and after feeding is consistent with the preset load of the lock hopper, which indicates that the powder discharging of the lock hopper 1 is finished, the lock hopper outlet valve 18 is closed, and the powder discharging of the lock hopper 1 is stopped. Specifically, the high-pressure feed tank weighing unit comprises a second weighing element (such as a gravity sensor/weighing sensor) 26 for respectively detecting the weight of the high-pressure feed tank 3 before and after feeding, and further comprises a lock hopper outlet valve control module in communication connection with the second weighing element 26, wherein the lock hopper outlet valve control module is used for controlling the lock hopper outlet valve control module according to the weight W of the high-pressure feed tank 3 before feeding, which is output by the second weighing element 26DV1And weight W after feedingDV2Calculating to obtain the weight difference W between the twoDV2-WDV1And according to the weight difference and the preset lock bucket load WLHControls the opening and closing of the lock hopper outlet valve 18; for example, in the powder discharging stage of the lock hopper, when WLH＝WDV2-WDV1And controlling the outlet valve 18 of the lock hopper to close when the powder feeding of the lock hopper 1 is judged to be finished.
And the lock bucket emptying control unit is used for controlling the opening degree of the lock bucket emptying adjusting valve 19 so as to regulate and control the pressure in the lock bucket 1. In some embodiments, the lock bucket emptying control unit comprises a lock bucket emptying regulating valve control module for regulating and controlling the opening of the lock bucket emptying regulating valve 19, and the lock bucket emptying regulating valve control module is in communication connection with a pressure gauge (for detecting the pressure in the lock bucket) on the lock bucket 1 and a pressure gauge (for detecting the pressure in the high-pressure feeding tank) on the high-pressure feeding tank 3; the lock bucket emptying regulating valve control module is used for calculating to obtain the pressure difference between the lock bucket 1 and the high-pressure feed tank 3 according to the pressure data respectively output by the pressure gauge on the lock bucket 1 and the pressure gauge on the high-pressure feed tank 3, and regulating and controlling the opening degree of the lock bucket emptying regulating valve 19 to regulate the pressure in the lock bucket 1 according to the comparison result of the pressure difference and the preset pressure difference requirement (namely the pressure difference requirement of the preset lock bucket and the high-pressure feed tank, for example, the pressure difference requirement of the two is within 0.05 MPa), so that the pressure difference between the lock bucket 1 and the high-pressure feed tank 3 meets the preset pressure difference requirement. For example, before the powder is fed into the high-pressure feed tank 3 by the lock hopper 1, if the pressure of the lock hopper 1 is too high, so that the pressure difference between the lock hopper 1 and the high-pressure feed tank 3 exceeds the pressure difference requirement range, the lock hopper emptying control unit regulates the lock hopper emptying regulating valve 19 to regulate the pressure in the lock hopper, so that the pressure of the lock hopper is reduced, and the pressure difference between the lock hopper 1 and the high-pressure feed tank 3 meets the preset pressure difference requirement.
Further, the pressure in the lock hopper 1 can be relieved to normal pressure by adjusting the opening of the lock hopper emptying adjusting valve 19. Preferably, the lock hopper air release control unit can also regulate and control the opening of the lock hopper air release regulating valve 19 so as to release the pressure in the lock hopper 1 to the normal pressure. Preferably, in the stage of releasing the pressure of the lock hopper, the lock hopper air release regulating valve control module of the lock hopper air release control unit is further configured to calculate a lock hopper pressure reduction rate according to pressure data output by a pressure gauge on the lock hopper 1, and regulate the opening of the lock hopper air release regulating valve 19 according to a comparison result between the lock hopper pressure reduction rate and a preset lock hopper pressure reduction rate requirement (for example, 0.45MPa/min-0.5MPa/min) so as to release the pressure of the lock hopper 1 to normal pressure according to the preset lock hopper pressure reduction rate requirement.
And a valve cooling purge unit for inputting purge gas to the lock hopper inlet valve 17 and the lock hopper outlet valve 18 to cool the packing 35 inside the valve. Specifically, referring to fig. 6, the lock hopper inlet valve 17 and the lock hopper outlet valve 18 are provided with purge ports 36 for introducing purge gas to cool the packing 35 inside the valves, respectively. The valve cooling and purging unit comprises a first purging gas pipeline 11 connected between the carbon dioxide pressurizing gas source 5 and the purging port of the lock bucket inlet valve 17, and a second purging gas pipeline 12 connected between the carbon dioxide pressurizing gas source 5 and the purging port of the lock bucket outlet valve 18, wherein purging gas flow limiting pore plates 14 are respectively arranged on the first purging gas pipeline 11 and the second purging gas pipeline 12. After pyrolysis, the temperature of coke powder is generally above 200 ℃, the tolerance temperature of tetrafluoroethylene which is a common filler of a valve is about 240 ℃, the temperature of the coke powder is close to that of the filler, if the valve is not cooled, the filler of the valve is easy to lose efficacy, so that the leakage fault of the valve is caused, and particularly the coke powder passes through a lock hopper inlet valve 17 and a lock hopper outlet valve 18 on a path. The invention is provided with a valve for coolingA purging unit, wherein a purging port 36 is arranged on the valve body of the lock hopper inlet valve 17 and the lock hopper outlet valve 18, and CO is discharged through a purging gas flow limiting pore plate 14 on the first purging gas pipeline 11 and the second purging gas pipeline 122(e.g., 50-100kg/h CO2) The high-temperature coke powder is fed into a valve, so that the damage of the high-temperature coke powder to a valve filler can be effectively prevented.
In a preferred embodiment, pipeline stress relieving structures 21 are respectively arranged on the lock hopper feeding pipeline 8, the lock hopper discharging pipeline 9 and the pressure relief pipeline 10; because high pressure feed tank 3 arranges in lock 1 low reaches, all establish pipeline stress relieving structure 21 on lock feed line 8, lock ejection of compact pipeline 9 and pressure release pipeline 10, can effectively avoid lock 1 to the influence of high pressure feed tank weighing unit in the operation process. Specifically, the pipeline stress relieving structure 21 is a unitary hinge-type expansion joint, which is shown in fig. 5, and includes a corrugated pipe 33 disposed on the lock hopper feed line, the lock hopper discharge line, and the pressure relief line, respectively, and a unitary hinge 34 disposed between the front and rear sides of the corrugated pipe 33 along the axial direction of the corrugated pipe 33. Pipeline stress generated in the operation process of the lock hopper 1 is absorbed through an expansion joint corrugated structure, and meanwhile, the expansion joint can be guaranteed to act only in the axial direction through a single hinge 34 outside a corrugated pipe 33, so that radial deformation is avoided, and the service life of the expansion joint is prolonged.
The various control modules referred to herein, such as the lock hopper inlet valve control module, the lock hopper outlet valve control module, the inflation cone pressurization control module, the lock hopper vent regulation valve control module, and the like, specifically, such as a chip with corresponding control and calculation functions, and the like, may be integrated into the system controller, or may be provided independently.
As an illustration, the powder pressurizing and conveying method based on the powder pressurizing and conveying system comprises four stages, namely 1) a powder collecting stage, 2) a pressurizing stage, 3) a powder discharging stage and 4) a pressure releasing stage. The lock hopper operation can be circulated through sequential control.
Before the lock hopper 1 is put into use to collect the powder, that is, before the following step 1) is performed, purge gas is input to the purge ports 36 of the lock hopper inlet valve 17 and the lock hopper outlet valve 18 by the valve cooling purge unit, and the lock hopper 1 is ready to collect the powder.
Step 1) powder collection stage: the inlet valve 17 of the lock hopper is opened, the normal pressure powder bin 2 feeds the lock hopper 1, and powder such as high temperature coke powder is fed into the lock hopper 1. Preferably, after the lock hopper inlet valve 17 is opened, the normal pressure powder bin weighing unit is put into use, the weight of the normal pressure powder bin 2 before and after discharging is detected, the weight difference value of the normal pressure powder bin before and after discharging is compared with the preset lock hopper load, when the weight difference value is consistent with the preset lock hopper load, the lock hopper is judged to be full of powder, and the lock hopper inlet valve 17 is closed.
Step 2) a pressurizing stage: step 1) after the normal pressure powder bin 2 finishes discharging (namely after the locking hopper 1 finishes collecting powder), the pressurized gas in the carbon dioxide pressurized gas source 5 is charged into the locking hopper 1 through the pressurized gas inlet pipeline 6 through the gas inlet of the charging cone 15, so that the locking hopper 1 is pressurized. Preferably, during the process of pressurizing the lock hopper 1, the opening degree of the pressurized air flow control valve 13 is controlled by an inflation cone pressurizing control module of the inflation cone pressurizing control unit, so as to regulate and control the flow rate of the pressurized air which is introduced into the inflation cone 15 through the pressurized air inlet pipeline 6. More specifically, after the normal-pressure powder bin 1 is completely discharged in step 1), the flow rate of the pressurized gas required by the pressurization of the lock hopper 1 under the existing pressure is calculated in advance according to the target pressure (for example, 4.5-5.0MPa) required by the pressurization of the lock hopper 1 and the time required by the pressurization, and for example, the calculation can be completed by a lock hopper pressurized gas calculation module, or the calculation function is configured in an inflation cone pressurized control module. The inflation cone pressurizing control module regulates and controls the opening of the pressurized airflow control valve 13 to enable the pressurized airflow on the pressurized airflow inlet pipeline 6 to meet the pressurized airflow requirement required by lock bucket pressurizing. Preferably, in the process of regulating and controlling the opening degree of the pressurized airflow control valve 13, the volume flow rate of the lock hopper inflation gas entering the lock hopper through the lock hopper inflation cone 15 is also preferably kept consistent.
In some embodiments, the pipeline gas supplementing unit may be synchronously deployed at the later stage of the pressurization, and pressurized gas is supplemented into the lock hopper 1 through the pipeline gas supplementing unit via the pipeline gas supplementing device 16, for example, the pressurized gas is firstly inflated into the lock hopper 1 through the lock hopper inflation cone 15, when the lock hopper pressure is inflated to a pressure close to a target pressure (for example, 4.5-5.0MPa), for example, the inflation pressure is 4.0MPa, the pipeline gas supplementing unit may be synchronously deployed at this time, and the opening degree of the pressurized gas flow control valve 13 is reduced so that the pressurized gas flow inflated through the inflation cone 15 is reduced, thereby avoiding over-inflation; when the pipeline air supplement unit is put into use, the pipeline air supplement valve 22 is opened to supplement pressurized air into the lock bucket, so that the lock bucket is pressurized to the target pressure.
Step 3) powder discharging stage: after the pressure charging of the lock hopper 1 in the step 2) is finished, regulating and controlling the lock hopper emptying regulating valve 19 to regulate the pressure in the lock hopper 1 and enable the pressure difference between the lock hopper 1 and the high-pressure feed tank 3 to meet the preset pressure difference requirement; then the lock hopper outlet valve 18 is opened, and the lock hopper 1 starts to discharge powder (i.e. the high-pressure feeding bucket 3 starts to feed). Preferably, before powder discharging of the lock hopper 1 is carried out, the opening degree of the lock hopper emptying adjusting valve 19 is regulated and controlled by the lock hopper emptying control unit to adjust the pressure in the lock hopper 1, so that the pressure difference between the lock hopper 1 and the high-pressure feed tank 3 meets a preset pressure difference requirement, for example, the pressure difference between the lock hopper 1 and the high-pressure feed tank 3 is controlled within 0.05 MPa. After the locking hopper outlet valve 18 is opened, the high-pressure feeding tank weighing unit is put into use, the weight of the high-pressure feeding tank 3 before feeding and after feeding is detected, the weight difference value of the high-pressure feeding tank 3 before feeding and after feeding is compared with the preset locking hopper load, when the weight difference value of the high-pressure feeding tank 3 before feeding and after feeding is consistent with the preset locking hopper load, the fact that powder in the locking hopper is conveyed is judged to be finished, and the locking hopper outlet valve 18 is closed. At this time, the pipeline aeration valve 22 may be closed at the same time.
Step 4), a pressure relief stage: after the powder is conveyed by the lock hopper 1 (namely after the feeding of the high-pressure feeding tank 3 is finished), the lock hopper emptying adjusting valve 19 is adjusted to release the pressure in the lock hopper 1 to the normal pressure. Preferably, in the pressure relief stage, the opening degree of the lock bucket emptying adjusting valve 19 can be regulated and controlled by the lock bucket emptying control unit so that the pressure in the lock bucket 1 is relieved to the normal pressure. Preferably, in the stage of releasing the pressure of the lock hopper, the lock hopper air release regulating valve control module of the lock hopper air release control unit is configured to calculate a lock hopper pressure reduction rate according to pressure data output by a pressure gauge on the lock hopper 1, and regulate the opening of the lock hopper air release regulating valve 19 according to a comparison result between the lock hopper pressure reduction rate and a preset lock hopper pressure reduction rate requirement (for example, 0.45MPa/min to 0.5MPa/min) so as to release the pressure of the lock hopper 1 to normal pressure according to the preset lock hopper pressure reduction rate requirement. After the pressure release is finished, the lock hopper 1 can be ready to enter the powder collecting stage again.
For other descriptions of the powder pressure conveying method, reference may be made to the corresponding descriptions mentioned above, and further description is omitted.
The following further illustrates a specific application of the pressurized powder delivery system of the present invention. The description of the pressurized powder conveying system and the pressurized powder conveying method can refer to the above description and will not be repeated.
A 2000 ton/day gasification device using 220 deg.C coke powder as gasification raw material, and two gasification devices with a volume of 45m3In the lock hopper 1 of the present invention, the operating pressure of the lock hopper 1 (i.e., the target pressure of the lock hopper pressurization) is 4.7MPa, and the pressurization gas of the lock hopper 1 is CO2，CO2The methanol content in the product was 200 ppm. According to the operation of the powder pressurizing and conveying method, the lock hopper 1 operates for more than 5 years, the lock hopper runs normally in a sequential control manner and automatically, the weighing is accurate, and the conditions of valve filling and weighing element damage do not occur, and CO are not used2The methanol content in the exhaust gas (i.e. the vent gas for pressure relief of the lock hopper) is less than 50mg/m3。
The parts which are not specifically described herein are understood or known by those skilled in the art based on the conventional art and conventional technical means, and are not described in detail.
It will be appreciated by those skilled in the art that modifications or adaptations to the invention may be made in light of the teachings of the present specification. Such modifications or adaptations are intended to be within the scope of the present invention as defined in the claims.
Claims (10)
1. The utility model provides a lock is fought, its characterized in that, the lock is fought and is equipped with pan feeding mouth, discharge gate and pressure release mouth, the discharge gate is located the bottom of lock is fought, be equipped with on the discharge gate and be used for to the lock fill in let in the awl of aerifing of pressurization gas, be equipped with on the awl of aerifing the income gas port of pressurization gas, be equipped with the confession in the awl of aerifing material in the lock is fought from the lock the discharge gate is to the material passageway of outside output.
2. The lock hopper according to claim 1, wherein the inflation cone comprises a pressure-bearing shell, a sintered metal mesh and a metal plate providing support for the sintered metal mesh;
the air inlet of the inflation cone is arranged on the pressure-bearing shell, the sintering metal net is arranged in the inner cavity of the pressure-bearing shell, the sintering metal net is integrally surrounded to form the material channel, the metal plate is arranged between the inner wall of the pressure-bearing shell and the sintering metal net, and a plurality of air holes are formed in the metal plate;
preferably, the sintered wire mesh comprises a plurality of layers of laminated sintered wire mesh.
3. A lock hopper pressurization system is characterized by comprising,
the lock hopper of claim 1 or 2;
the air inlet of the inflation cone of the lock hopper is connected with the carbon dioxide pressurization air source through a pressurization air inlet pipeline, and a pressurization air flow control valve is arranged on the pressurization air inlet pipeline;
preferably, the lock hopper pressurization system further comprises an inflation cone pressurization control unit, the inflation cone pressurization control unit comprises an inflation cone pressurization control module for controlling the opening of the pressurization gas flow control valve, a flowmeter for detecting the pressurization gas flow is further arranged on the pressurization gas inlet pipeline, and the inflation cone pressurization control module is in communication connection with the flowmeter;
preferably, the lock fill pressurization system further comprises a pipeline air supplement unit for supplementing pressurized air into the lock fill, the pipeline air supplement unit comprises a pipeline air supplement device arranged at the position of the material channel outlet of the air supplement cone and a pipeline air supplement pipeline connected between the pipeline air supplement device and the pressurized air inlet pipeline, and a pipeline air supplement valve and a pipeline air supplement flow limiting pore plate are arranged on the pipeline air supplement pipeline.
4. A method of lock hopper pressurization using the lock hopper pressurization system of claim 3, comprising the steps of:
inputting the pressurized gas in the carbon dioxide pressurized gas source to the gas inlet of the inflation cone through the pressurized gas inlet line, so as to pressurize the lock hopper;
preferably, the opening degree of the pressurized gas flow control valve is controlled by an inflation cone inflation control module of an inflation cone inflation control unit so as to regulate and control the pressurized gas flow introduced into the inflation cone through the pressurized gas inlet pipeline;
preferably, the pipeline air supplement unit is used for supplementing the pressurized air required by the pressurization of the lock bucket into the lock bucket.
5. A pressurized powder delivery system comprising the lock hopper pressurization system of claim 3, an atmospheric powder bin, and a high pressure feed tank;
the discharge port of the normal-pressure powder bin is connected with the feed inlet of the lock hopper through a lock hopper feed pipeline, and a lock hopper inlet valve is arranged on the lock hopper feed pipeline;
the material channel of the inflation cone of the lock hopper is connected with the feeding port of the high-pressure feeding tank through a lock hopper discharge pipeline, and a lock hopper outlet valve is arranged on the lock hopper discharge pipeline;
the pressure relief port of the lock hopper is connected with the normal-pressure powder bin through a pressure relief pipeline, and a lock hopper emptying adjusting valve is arranged on the pressure relief pipeline;
preferably, the powder pressurized conveying system further comprises a normal-pressure powder bin weighing unit for detecting the weight of the normal-pressure powder bin before and after discharging and controlling the opening and closing of the lock hopper inlet valve according to the comparison result of the weight difference value of the normal-pressure powder bin and the preset lock hopper load;
preferably, the powder pressurized conveying system further comprises a high-pressure feeding tank weighing unit for detecting the weight of the high-pressure feeding tank before and after feeding and controlling the opening and closing of the lock hopper outlet valve according to the comparison result of the weight difference of the high-pressure feeding tank before and after feeding and the preset lock hopper load;
preferably, the powder pressurized conveying system further comprises a lock hopper emptying control unit for controlling the opening of the lock hopper emptying adjusting valve to regulate and control the pressure in the lock hopper;
preferably, the powder pressurized conveying system further comprises a valve cooling and purging unit for inputting a purge gas to the lock hopper inlet valve and the lock hopper outlet valve to cool the filler in the valve.
6. The powder pressurized conveying system of claim 5, wherein the pipeline air supplement unit of the pipeline air supplement unit is arranged between the material channel of the air supplement cone and the lock hopper discharge pipeline.
7. The powder pressurized conveying system according to claim 5, wherein the normal-pressure powder bin weighing unit comprises a first weighing element for detecting the weight of the normal-pressure powder bin before and after discharging, and further comprises a lock hopper inlet valve control module in communication connection with the first weighing element, wherein the lock hopper inlet valve control module is used for calculating the weight difference between the normal-pressure powder bin before and after discharging according to the weight output by the first weighing element and controlling the opening and closing of the lock hopper inlet valve according to the comparison result between the weight difference and a preset lock hopper load;
the high-pressure feeding tank weighing unit comprises a second weighing element and a locking hopper outlet valve control module, the second weighing element is used for detecting the weight of the high-pressure feeding tank before and after feeding, the locking hopper outlet valve control module is in communication connection with the second weighing element, and the locking hopper outlet valve control module is used for calculating the weight difference of the high-pressure feeding tank before and after feeding according to the weight output by the second weighing unit and controlling the opening and closing of the locking hopper outlet valve according to the weight difference and a comparison result of a preset locking hopper load.
8. The powder pressurized conveying system of claim 5, wherein the lock hopper inlet valve and the lock hopper outlet valve are respectively provided with a purging port for introducing purging gas to cool the filler in the valve; the valve cooling and purging unit comprises a first purging gas pipeline connected between the carbon dioxide pressurizing gas source and the purging port of the lock bucket inlet valve, and a second purging gas pipeline connected between the carbon dioxide pressurizing gas source and the purging port of the lock bucket outlet valve, and purging gas flow-limiting pore plates are respectively arranged on the first purging gas pipeline and the second purging gas pipeline;
and/or, the lock fill emptying control unit comprises a lock fill emptying adjusting valve control module for regulating the opening degree of the lock fill emptying adjusting valve, and the lock fill emptying adjusting valve control module is in communication connection with a pressure meter on the lock fill and a pressure meter on the high-pressure feeding tank.
9. The powder lot pressurized conveying system according to claim 5, wherein pipeline stress relief structures are respectively arranged on the lock hopper feeding pipeline, the lock hopper discharging pipeline and the pressure relief pipeline;
preferably, the pipeline stress relieving structure comprises corrugated pipes respectively arranged on a lock hopper feeding pipeline, a lock hopper discharging pipeline and a pressure relief pipeline, and further comprises a single hinge arranged between the front side and the rear side of the corrugated pipe along the axial direction of the corrugated pipe.
10. The pressurized powder conveying method based on the pressurized powder conveying system of any one of claims 5 to 9, characterized by comprising the steps of:
1) a powder collecting stage: opening the inlet valve of the lock hopper, and discharging materials from the normal-pressure powder bin to the lock hopper;
2) and (3) a pressurizing stage: after the normal-pressure powder bin finishes discharging, pressurized gas in the carbon dioxide pressurized gas source is filled into the lock hopper through the pressurized gas inlet pipeline through the gas inlet of the inflation cone, so that the lock hopper is pressurized;
3) powder feeding stage: regulating and controlling the lock hopper emptying regulating valve to regulate the pressure in the lock hopper and make the pressure difference between the lock hopper and the high-pressure feed tank meet the preset pressure difference requirement; then opening the outlet valve of the lock hopper, and starting feeding by the high-pressure feeding tank;
4) a pressure relief stage: after the high-pressure feeding tank finishes feeding, adjusting the lock hopper emptying adjusting valve to release the pressure in the lock hopper to normal pressure;
preferably, before starting step 1), purge gas is input to the lock bucket inlet valve and the lock bucket outlet valve through the valve cooling purge unit;
preferably, in the step 1), the weight of the normal-pressure powder bin before and after blanking is detected by the normal-pressure powder bin weighing unit, the weight difference value between the detected weight and the weight of the normal-pressure powder bin before and after blanking is compared with a preset lock hopper load, and when the weight difference value is consistent with the preset lock hopper load, the lock hopper inlet valve is closed;
preferably, in the step 2), in the process of pressurizing the lock hopper, the opening degree of the pressurized gas flow control valve is controlled by an inflation cone pressurizing control module of the inflation cone pressurizing control unit so as to regulate and control the pressurized gas flow introduced into the inflation cone through the pressurized gas inlet pipeline; preferably, a pipeline air supplement unit is used for supplementing pressurized air into the lock hopper through the pipeline air supplement device;
preferably, the lock hopper emptying control unit comprises a lock hopper emptying adjusting valve control module for regulating and controlling the opening of the lock hopper emptying adjusting valve, and the lock hopper emptying adjusting valve control module is in communication connection with a pressure gauge on the lock hopper and a pressure gauge on the high-pressure feeding tank; in the step 3), the lock hopper emptying regulating valve control module calculates pressure difference between the lock hopper and the high-pressure feeding tank according to pressure data respectively output by a pressure gauge on the lock hopper and a pressure gauge on the high-pressure feeding tank, and regulates and controls the opening of the lock hopper emptying regulating valve according to a comparison result of the pressure difference and a preset pressure difference requirement so as to regulate the pressure in the lock hopper and enable the pressure difference between the lock hopper and the high-pressure feeding tank to meet the preset pressure difference requirement; in the step 4), the opening of the lock hopper vent control valve is regulated and controlled by the lock hopper vent control unit so as to enable the pressure in the lock hopper to be relieved to the normal pressure, preferably, the lock hopper vent control valve control module calculates a lock hopper pressure reduction rate according to pressure data output by a pressure gauge on the lock hopper and regulates the opening of the lock hopper vent control valve so as to enable the lock hopper to be relieved to the normal pressure according to the preset lock hopper pressure reduction rate requirement according to a comparison result of the lock hopper pressure reduction rate and the preset lock hopper pressure reduction rate requirement;
preferably, in step 3), the weight of the high-pressure feeding tank before and after feeding is detected by a high-pressure feeding tank weighing unit, the weight difference between the weight of the high-pressure feeding tank and the weight of the high-pressure feeding tank is compared with a preset lock bucket load, and when the weight difference is consistent with the preset lock bucket load, the lock bucket outlet valve is closed;
preferably, the powder is coke powder with the temperature of more than 200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191211.4A CN113801699A (en) | 2021-10-13 | 2021-10-13 | Lock hopper, lock hopper pressurization system and powder pressurization conveying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111191211.4A CN113801699A (en) | 2021-10-13 | 2021-10-13 | Lock hopper, lock hopper pressurization system and powder pressurization conveying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113801699A true CN113801699A (en) | 2021-12-17 |
Family
ID=78897697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111191211.4A Pending CN113801699A (en) | 2021-10-13 | 2021-10-13 | Lock hopper, lock hopper pressurization system and powder pressurization conveying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113801699A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466634A (en) * | 2022-10-19 | 2022-12-13 | 国家能源集团宁夏煤业有限责任公司 | Coal powder lock hopper |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS601476A (en) * | 1983-04-07 | 1985-01-07 | フオスタ−・ホイ−ラ−・エナ−ジイ・コ−ポレイシヨン | Assembly of gate valve |
| JP2011068963A (en) * | 2009-09-28 | 2011-04-07 | Jfe Steel Corp | Method for preventing damage of lower part seal-valve packing in furnace top part of blast furnace |
| CN102676233A (en) * | 2012-05-07 | 2012-09-19 | 北京盈德清大科技有限责任公司 | Air inflation awl for pulverized coal gasification device |
| CN104403693A (en) * | 2014-12-11 | 2015-03-11 | 赛鼎工程有限公司 | Crushed-coal pressurizing gasifier |
| CN107057769A (en) * | 2017-01-13 | 2017-08-18 | 陕西延长石油（集团）有限责任公司 | A kind of fine coal feeding control device and method |
| CN210236420U (en) * | 2019-05-07 | 2020-04-03 | 新奥科技发展有限公司 | Semicoke conveying device |
| CN210735644U (en) * | 2019-06-21 | 2020-06-12 | 新奥科技发展有限公司 | Material conveying and metering device |
| CN216106798U (en) * | 2021-10-13 | 2022-03-22 | 科林能源技术(北京)有限公司 | Lock hopper, lock hopper pressurization system and powder pressurization conveying system |
-
2021
- 2021-10-13 CN CN202111191211.4A patent/CN113801699A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS601476A (en) * | 1983-04-07 | 1985-01-07 | フオスタ−・ホイ−ラ−・エナ−ジイ・コ−ポレイシヨン | Assembly of gate valve |
| JP2011068963A (en) * | 2009-09-28 | 2011-04-07 | Jfe Steel Corp | Method for preventing damage of lower part seal-valve packing in furnace top part of blast furnace |
| CN102676233A (en) * | 2012-05-07 | 2012-09-19 | 北京盈德清大科技有限责任公司 | Air inflation awl for pulverized coal gasification device |
| CN104403693A (en) * | 2014-12-11 | 2015-03-11 | 赛鼎工程有限公司 | Crushed-coal pressurizing gasifier |
| CN107057769A (en) * | 2017-01-13 | 2017-08-18 | 陕西延长石油（集团）有限责任公司 | A kind of fine coal feeding control device and method |
| CN210236420U (en) * | 2019-05-07 | 2020-04-03 | 新奥科技发展有限公司 | Semicoke conveying device |
| CN210735644U (en) * | 2019-06-21 | 2020-06-12 | 新奥科技发展有限公司 | Material conveying and metering device |
| CN216106798U (en) * | 2021-10-13 | 2022-03-22 | 科林能源技术(北京)有限公司 | Lock hopper, lock hopper pressurization system and powder pressurization conveying system |
Non-Patent Citations (3)
| Title |
|---|
| 中国冶金设备总公司编著: "现代大型高炉设备及制造技术", 30 April 1996, 冶金工业出版社, pages: 728 - 729 * |
| 吴晓编: "柱塞式气力输灰技术", 31 July 2006, 中国电力出版社, pages: 145 - 149 * |
| 周建安: "炉外底喷粉脱硫工艺研究", 30 November 2008, 冶金工业出版社, pages: 49 - 50 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115466634A (en) * | 2022-10-19 | 2022-12-13 | 国家能源集团宁夏煤业有限责任公司 | Coal powder lock hopper |
| CN115466634B (en) * | 2022-10-19 | 2024-02-27 | 国家能源集团宁夏煤业有限责任公司 | Pulverized coal lock bucket |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2496854C2 (en) | System for continuous fuel feed to reactor for coal gasification | |
| US20120266966A1 (en) | Metering system, dense phase conveying system and method for supplying bulk material in powder form | |
| CN216106798U (en) | Lock hopper, lock hopper pressurization system and powder pressurization conveying system | |
| US20200391962A1 (en) | Powder supply hopper pressurizing apparatus, gasifier unit, integrated gasification combined cycle and control method of powder supply hopper pressurizing apparatus | |
| US9637696B2 (en) | Solids supply system and method for supplying solids | |
| CN104169198B (en) | powder supply device and powder supply method | |
| US20100147413A1 (en) | Use of pure carbon dioxide as an inerting and flow medium in powder injection systems for use in pulverized coal gasification under pressure | |
| CN113801699A (en) | Lock hopper, lock hopper pressurization system and powder pressurization conveying system | |
| CN108504393A (en) | Energy-efficient fine coal pressurization conveying system | |
| CN105347040A (en) | Pressure feed type high-pressure dense-phase pneumatic conveying device and pneumatic conveying method | |
| CN108870787A (en) | A kind of tower fused salt heat dump compressed air system | |
| CN210596125U (en) | Blast furnace top gas recovery device utilizing recovered gas to seal distributor gear box | |
| JP2013139310A (en) | Powder supply apparatus | |
| CN107652990A (en) | A kind of pyrolysis oven feed system | |
| CN106140033B (en) | A kind of adding method of catalyst | |
| JP2012162660A (en) | Coal gasification, coal conveyance system and coal gasification-combined power-generating plant | |
| US20120257934A1 (en) | Metering system, dense phase conveying system and method for supplying bulk material in powder form | |
| CN208327929U (en) | Energy-efficient fine coal pressurization conveying system | |
| CN214571743U (en) | Gasification furnace pulverized coal feeding bin discharging system | |
| CN113122334A (en) | Inflation filtering system and using method thereof | |
| CN208791581U (en) | Pressurization of dry pulverized coal dense-phase transporting system | |
| JP2001226682A (en) | Feeder for finely powdered solid carbonaceous raw material | |
| CN106190328B (en) | Powder lock hopper pressurizing system and powder lock hopper pressurizing method using same | |
| KR20110018183A (en) | Apparatus and method for manufacturing directed reduced irons and apparatus and method for manufacturing molten irons using the same | |
| CN217997081U (en) | High-pressure dense-phase conveying simulation system applied to pulverized coal gasification in test stage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |