CN111603917A - Flue gas purification system for waste incineration - Google Patents
Flue gas purification system for waste incineration Download PDFInfo
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- CN111603917A CN111603917A CN202010492560.9A CN202010492560A CN111603917A CN 111603917 A CN111603917 A CN 111603917A CN 202010492560 A CN202010492560 A CN 202010492560A CN 111603917 A CN111603917 A CN 111603917A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- 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
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- 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
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
- B01D2258/0291—Flue gases from waste incineration plants
Abstract
The invention discloses a flue gas purification system for waste incineration, which comprises a purification box, wherein purification liquid is filled in the purification box, a plurality of air outlet holes are formed in the upper end of the purification box, a fixed cylinder is fixedly connected to the bottom in the purification box, a sliding plug is connected to the inner wall of the fixed cylinder in a sealing and sliding manner, evaporation liquid is filled in a closed space formed by the lower end of the sliding plug and the fixed cylinder, an air inlet pipe is connected to the side wall of the purification box, and the air inlet pipe penetrates through the lower part of the inner wall of the fixed cylinder. According to the invention, the evaporated liquid is heated by the flue gas flowing through the gas inlet pipe, so that the sliding plug is pushed to slide upwards, the screw nut moves upwards along the side wall of the screw rod while rotating under the action of the screw rod, and then the circular ring moves upwards while rotating on the side wall of the fixed cylinder, so that the stirring blades fixedly connected to the side wall of the circular ring are driven to rotate, the purified liquid in the purifying box is stirred, the purified liquid in the purifying box is uniformly mixed, the contact area of the flue gas and the purified liquid is increased, and the purification quality is improved.
Description
Technical Field
The invention relates to the technical field of waste incineration, in particular to a flue gas purification system for waste incineration.
Background
The waste incineration is a process of reducing the volume of waste by oxidation at a high temperature through appropriate reactions such as thermal decomposition, combustion, melting, and the like to form residues or molten solid substances, and after the waste incineration, it is necessary to purify the flue gas in order to prevent harmful gases in the flue gas generated by the waste incineration from being discharged into the atmosphere.
At present, the flue gas generated by waste incineration is treated through a wet process, namely the acidic gas in the flue gas is absorbed through lime slurry or NaOH solution, but when the acidic gas in the flue gas is absorbed, the concentration of the purifying liquid is gradually reduced along with continuous purification of the acidic gas, and further the purifying effect on the acidic gas is poor, manual timing addition of the lime slurry or NaOH particles is needed, the labor intensity is high, and when the acidic gas is purified, the purifying liquid is in a static state, the scaling problem easily occurs, and the subsequent treatment on the purifying liquid is troublesome.
Therefore, a flue gas purification system for waste incineration is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a flue gas purification system for waste incineration.
In order to achieve the purpose, the invention adopts the following technical scheme:
a flue gas purification system for waste incineration comprises a purification box, wherein the purification box is filled with purification liquid, a plurality of air outlet holes are arranged at the upper end of the purifying box, a fixed cylinder is fixedly connected at the bottom in the purifying box, the inner wall of the fixed cylinder is hermetically and slidably connected with a sliding plug, an evaporation liquid is filled in a closed space formed by the lower end of the sliding plug and the fixed cylinder, the side wall of the purification box is connected with an air inlet pipe, the air inlet pipe penetrates through the lower part of the inner wall of the fixed cylinder, the top part in the fixed cylinder is fixedly connected with a screw rod through a cooling mechanism, the upper end of the sliding plug is rotationally connected with a screw nut in threaded connection with the side wall of the screw through a connecting rod, the side wall of the fixed cylinder is connected with a circular ring in a sliding way, the side wall of the circular ring is fixedly connected with a plurality of stirring blades, the lead screw nut is embedded with a permanent magnet, and the circular ring is embedded with a permanent magnet which is attracted with the permanent magnet.
Preferably, cooling body includes the cooler bin of fixed connection top in the solid fixed cylinder, the cooler bin intussuseption is filled with the coolant liquid, cooler bin inner wall fixed connection's header tank, solid fixed cylinder inner wall below is through one-way intake pipe and header tank inner wall intercommunication, sliding plug lower extreme fixedly connected with slide, the header tank inner wall passes through feed liquor pipe and solid fixed cylinder inner wall below intercommunication, install the relief valve in the feed liquor pipe.
Preferably, the top symmetry fixedly connected with storage case by the iron material is made in the purifying box, the discharge gate has been seted up to storage case lower extreme, the discharge gate inner wall rotates and is connected with magnetic baffle, magnetic baffle passes through conductive spring and discharge gate inner wall fixed connection, the purifying box inner wall inlays and is equipped with helical coil, purifying liquid and conductive spring constitute the return circuit that switches on.
The invention has the following beneficial effects:
1. by arranging the evaporating liquid, the sliding plug, the screw rod and the screw rod nut, because the temperature in the flue gas is higher, the flue gas flowing through the air inlet pipe heats the evaporating liquid, the gasification amount of the evaporating liquid is increased along with the rise of the temperature of the evaporating liquid, and the sliding plug is further pushed to slide upwards, under the action of the screw rod, the screw rod nut moves upwards along the side wall of the screw rod in a rotating mode, so that the circular ring is driven to move upwards along the side wall of the fixed cylinder in a rotating mode, the stirring blades fixedly connected to the side wall of the circular ring are driven to rotate, and the purifying liquid in the purifying box is stirred;
2. by arranging the cooling mechanism, when the sliding plug moves upwards to drive the sliding plate to sweep the orifice of the one-way air inlet pipe, the gaseous evaporated liquid enters the liquid collecting tank through the one-way air inlet pipe, and is cooled and liquefied under the action of the cooling box, the pressure in the fixed cylinder is reduced along with the continuous discharge of the gaseous evaporating liquid in the fixed cylinder, thereby driving the sliding plug to move downwards, driving the screw nut to move downwards while rotating on the side wall of the screw, further driving the stirring blade to move downwards while rotating on the side wall of the fixed cylinder, when the sliding plug moves downwards, the pressure of the evaporating liquid in the liquid collecting tank on the pressure release valve reaches the critical value of the pressure release valve, then the evaporating liquid in the liquid collecting box enters the lower part of the fixed cylinder again through the liquid inlet pipe, so that the evaporating liquid continuously absorbs heat and evaporates, and then the screw nut is driven to move upwards while rotating on the side wall of the screw, the stirring blades are used for stirring the purifying liquid again, so that the purification of the acidic gas in the flue gas is accelerated;
3. by arranging the spiral coil, the storage box, the conductive spring and the magnetic baffle, when the circular ring slides up and down on the fixed cylinder, the spiral coil cuts magnetic induction lines and generates induction current, the concentration of a solvent in the purified liquid is gradually increased along with the continuous consumption of a solute in the purified liquid, and further the conductivity of the purified liquid is gradually enhanced, so that the current passing through the conductive spring is gradually increased, when the sum of the attractive forces between the coil springs on the conductive spring is greater than the attractive force between the magnetic baffle and the storage box, the conductive spring shrinks to drive the magnetic baffle to rotate, so that lime slurry or NaOH particles in the storage box enter the purification box, can be automatically added according to the consumption condition of the solute in the purified liquid, manual operation is not needed, and the labor intensity is reduced;
4. after lime slurry or NaOH particles are added into the purifying box, the lime slurry or NaOH particles are quickly and uniformly mixed with water along with the continuous rotation of the stirring blades, and then the filtering efficiency of the flue gas is accelerated.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is an enlarged view of the structure at A in FIG. 1;
FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;
fig. 4 is an enlarged schematic view of the structure at B in fig. 3.
In the figure: the device comprises a purification box 1, a gas outlet hole 2, a fixed cylinder 3, a sliding plug 4, a gas inlet pipe 5, a cooling box 6, a liquid collecting box 7, a one-way gas inlet pipe 8, a sliding plate 9, a liquid inlet pipe 10, a pressure release valve 11, a lead screw 12, a lead screw nut 13, a circular ring 14, a stirring blade 15, a permanent magnet 16, a permanent magnet 17, a spiral coil 18, a material storage box 19, a material outlet 20, a magnetic baffle 21 and a conductive spring 22.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example one
Referring to fig. 1-2, a flue gas purification system for waste incineration, comprising a purification box 1, a purification liquid filled in the purification box 1, a plurality of air outlets 2 formed at the upper end of the purification box 1, a fixed cylinder 3 fixedly connected to the bottom of the purification box 1, a sliding plug 4 connected to the inner wall of the fixed cylinder 3 in a sealing and sliding manner, wherein a through hole communicated with the outside is formed above the inner wall of the fixed cylinder 3 for balancing the air pressure of the sliding plug 4 when sliding on the inner wall of the fixed cylinder 3, an evaporation liquid filled in the closed space formed by the lower end of the sliding plug 4 and the fixed cylinder 3, further, the evaporation liquid is a pentane solution, the boiling point of the pentane solution is 36.1 ℃, the side wall of the purification box 1 is connected with an air inlet pipe 5, and the air inlet pipe 5 is arranged below the inner wall of the fixed cylinder 3 to heat the evaporation liquid by the heat of the flue gas entering the air inlet pipe 5, a lead, the lead screw nut 13 that connecting rod fixedly connected with and lead screw 12 lateral wall threaded connection are passed through to sliding plug 4 upper end, 3 lateral walls sliding connection of solid fixed cylinder has ring 14, 14 a plurality of stirring leaves 15 of ring lateral wall fixedly connected with, the embedded permanent magnet 16 that is equipped with of lead screw nut 13, the embedded permanent magnet 17 that is inhaled mutually with permanent magnet 16 that is equipped with of ring 14, furthermore, when sliding plug 4 drives lead screw nut 13 through the connecting rod and slides from top to bottom at solid fixed cylinder 3 inner wall, under lead screw 12's effect, lead screw nut 13 can slide in the rotatory limit in lead screw 12 lateral wall limit, and then make ring 14 drive stirring leaf 15 constantly stir from top to bottom in the purifying liquid, improve the purification quality to the flue gas.
Cooling body includes the cooler bin 6 at top in the solid fixed cylinder 3 of fixed connection, the intussuseption of cooler bin 6 is filled with the coolant liquid, the header tank 7 of 6 inner wall fixed connection of cooler bin, solid fixed cylinder 3 inner wall below is through one-way intake pipe 8 and 7 inner wall intercommunications of header tank, it needs to explain, one-way intake pipe 8 only allows gaseous state evaporated liquid to flow into in the header tank 7 from solid fixed cylinder 3, 4 lower extreme fixedly connected with slides 9 of sliding plug, the inner wall of header tank 7 passes through feed liquor pipe 10 and 3 inner wall below intercommunications of solid fixed cylinder, it is further, the bottom is the slope setting in the header tank 7, the discharge of the liquid evaporated liquid of being convenient for, install relief valve 11 in the feed liquor pipe 10.
In the embodiment, the flue gas enters the purifying box 1 through the air inlet pipe 5, so that the purifying liquid in the purifying box 1 is fully contacted with the flue gas to purify the acid gas in the flue gas;
because the flue gas after the garbage incineration contains a large amount of heat, the flue gas is continuously discharged from the air inlet pipe 5, the air inlet pipe 5 in the fixed cylinder 3 heats the evaporated liquid, the evaporation capacity of the evaporated liquid is increased along with the rising of the temperature of the evaporated liquid, the pressure in the fixed cylinder 3 is increased, the sliding plug 4 is further pushed to slide upwards, the sliding plug 4 drives the screw nut 13 to slide upwards through the connecting rod, the screw nut 13 moves upwards along the side wall of the screw 12 while rotating under the action of the screw 12, the permanent magnet 16 drives the permanent magnet 17 to move synchronously, the ring 14 is further driven to move upwards while rotating on the side wall of the fixed cylinder 3, the stirring blade 15 fixedly connected to the side wall of the ring 14 is driven to rotate, the purified liquid in the purifying box 1 is stirred, and the purification efficiency of the flue gas is improved;
the sliding plug 4 slides up to drive the sliding plate 9 fixedly connected with the lower end of the sliding plug to slide up, when the sliding plate 9 slides over the orifice of the one-way air inlet pipe 8, the gaseous evaporation liquid enters the liquid collecting tank 7 through the one-way air inlet pipe 8 and is cooled and liquefied under the action of the cooling tank 6, the pressure in the fixed cylinder 3 is reduced along with the continuous discharge of the gaseous evaporation liquid in the fixed cylinder 3, the sliding plug 4 is further driven to move downwards, the screw nut 13 is further driven to move downwards while rotating on the side wall of the screw 12, the stirring blades 15 are further driven to move downwards while rotating on the side wall of the fixed cylinder 3, the purified liquid is stirred again, when the sliding plug 4 moves downwards, the pressure of the evaporation liquid in the liquid collecting tank 7 on the pressure relief valve 11 reaches the critical value of the pressure relief valve 11, the evaporation liquid in the liquid collecting tank 7 enters the lower part of the fixed cylinder 3 again through the liquid inlet pipe 110, the evaporation liquid continues to absorb heat and further drive the screw, make stirring leaf 15 stir the scavenging solution once more, and then can make the continuous evaporation and the cooling of going on of evaporating liquid through cooling body, drive sliding plug 4 and slide from top to bottom at the 3 inner walls of fixed cylinder constantly for stirring leaf 15 is constantly stirring the scavenging solution, accelerates the purification to acid gas in the flue gas.
Example two
Referring to fig. 3-4, different from the first embodiment, a storage tank 19 made of an iron material is symmetrically and fixedly connected to the top inside the purification tank 1, a discharge port 20 is formed at the lower end of the storage tank 19, a magnetic baffle 21 is rotatably connected to the inner wall of the discharge port 20, the magnetic baffle 21 is fixedly connected to the inner wall of the discharge port 20 through a conductive spring 22, a spiral coil 18 is embedded in the inner wall of the purification tank 1, and the spiral coil 18, the purification solution and the conductive spring 22 form a conductive loop, it should be noted that, in an initial state, the solute content in the purification solution is large, so that the ion concentration of the aqueous solution in the purification solution is small, further, the current on the conductive spring 22 is small, so that the attractive force between the coils of the conductive spring 22 is not enough to overcome the attractive force between the magnetic baffle 21 and the inner wall of the discharge port 20, at this time, the magnetic, solute in the purifying liquid reduces gradually, and then the ionic strength of aqueous solution can constantly increase in the purifying liquid, because the electric conductivity of solution is directly proportional with the ionic strength of solution, and then the electric conductivity of solution can strengthen gradually, and then the electric current on the conductive spring 22 is great, make the appeal between each circle spring on the conductive spring 22 be enough to overcome the appeal between magnetic baffle 21 and the 20 inner walls of discharge gate, make the shrink of conductive spring 22 drive magnetic baffle 21 and rotate, make the raw materials in the storage case 19 flow out from discharge gate 20, the concentration to the purifying liquid of proper motion is replenished.
In this embodiment, when the ring 14 slides up and down on the fixed cylinder 3, the spiral coil 18 slides up and down relative to the permanent magnet 17, so that the spiral coil 18 cuts magnetic induction lines and generates an induced current, and then the conductive spring 22 is energized, and in an initial state, because the ion concentration of the aqueous solution in the purified liquid is small, and further the current on the conductive spring 22 is small, the attractive force between the coils of the conductive spring 22 is not enough to overcome the attractive force between the magnetic baffle 21 and the inner wall of the discharge hole 20, at this time, the magnetic baffle 21 remains stationary, and as the solute in the purified liquid is continuously consumed, the concentration of the solvent in the purified liquid gradually increases, and further the ion concentration of the aqueous solution in the purified liquid increases, so that the current passing through the conductive spring 22 increases, and when the sum of the attractive forces between the coils of the conductive spring 22 is greater than the attractive force between the magnetic baffle 21 and, at this moment, the conductive spring 22 contracts to drive the magnetic baffle 21 to rotate, so that lime slurry or NaOH particles in the storage tank 19 enter the purification tank 1, and can be automatically added according to the consumption condition of solutes in the purified liquid, manual operation is not needed, the labor intensity is reduced, and the operation is convenient.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A flue gas purification system for waste incineration comprises a purification box (1) and is characterized in that the purification box (1) is filled with purification liquid, a plurality of air outlet holes (2) are formed in the upper end of the purification box (1), a fixed cylinder (3) is fixedly connected to the bottom in the purification box (1), the inner wall of the fixed cylinder (3) is hermetically and slidably connected with a sliding plug (4), evaporation liquid is filled in a closed space formed by the lower end of the sliding plug (4) and the fixed cylinder (3), the side wall of the purification box (1) is connected with an air inlet pipe (5), the air inlet pipe (5) penetrates through the lower portion of the inner wall of the fixed cylinder (3), a lead screw (12) is fixedly connected to the inner top of the fixed cylinder (3) through a cooling mechanism, and a lead screw nut (13) in threaded connection with the side wall of the lead screw (12) is rotatably connected to the upper end, fixed cylinder (3) lateral wall sliding connection has ring (14), a plurality of stirring leaf (15) of ring (14) lateral wall fixedly connected with, the embedded permanent magnet (16) that is equipped with of screw-nut (13), embedded permanent magnet (17) that are inhaled mutually with permanent magnet (16) that are equipped with of ring (14).
2. The flue gas purification system for waste incineration as claimed in claim 1, wherein the cooling mechanism comprises a cooling tank (6) fixedly connected to the inner top of the fixed cylinder (3), the cooling tank (6) is filled with cooling liquid, a liquid collecting tank (7) fixedly connected to the inner wall of the cooling tank (6), the inner wall of the fixed cylinder (3) is communicated with the inner wall of the liquid collecting tank (7) through a one-way air inlet pipe (8) below the inner wall of the fixed cylinder (3), a sliding plate (9) is fixedly connected to the lower end of the sliding plug (4), the inner wall of the liquid collecting tank (7) is communicated with the inner wall of the fixed cylinder (3) below the inner wall of the fixed cylinder through a liquid inlet pipe (10), and a pressure release valve (11) is installed in the liquid.
3. The flue gas purification system for waste incineration as claimed in claim 1, wherein a storage tank (19) made of an iron material is symmetrically and fixedly connected to the inner top of the purification tank (1), a discharge port (20) is formed in the lower end of the storage tank (19), a magnetic baffle (21) is rotatably connected to the inner wall of the discharge port (20), the magnetic baffle (21) is fixedly connected to the inner wall of the discharge port (20) through a conductive spring (22), a spiral coil (18) is embedded in the inner wall of the purification tank (1), and the spiral coil (18), the purification liquid and the conductive spring (22) form a conductive loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010492560.9A CN111603917A (en) | 2020-06-03 | 2020-06-03 | Flue gas purification system for waste incineration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010492560.9A CN111603917A (en) | 2020-06-03 | 2020-06-03 | Flue gas purification system for waste incineration |
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| CN111603917A true CN111603917A (en) | 2020-09-01 |
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| CN202010492560.9A Pending CN111603917A (en) | 2020-06-03 | 2020-06-03 | Flue gas purification system for waste incineration |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090239A (en) * | 2020-09-21 | 2020-12-18 | 郑夏媛 | Toxic gas collecting equipment for asphalt paving in high-temperature environment |
| CN112275094A (en) * | 2020-10-14 | 2021-01-29 | 胡高乐 | Self-suction type toxic gas absorption equipment for asphalt paving |
| CN112546493A (en) * | 2020-12-08 | 2021-03-26 | 罗玉敏 | Fireproof alarm structure for cable trench of transformer substation |
| CN112815304A (en) * | 2020-12-31 | 2021-05-18 | 新兴铸管股份有限公司 | Combustion device and annealing furnace combustion system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204563991U (en) * | 2015-02-26 | 2015-08-19 | 江苏今日卫生用品有限公司 | A kind of liquid stirring device |
| CN109751882A (en) * | 2019-01-09 | 2019-05-14 | 刘童童 | A kind of metal vacuum smelting reduction furnace |
| CN110839448A (en) * | 2019-11-28 | 2020-02-28 | 周振豪 | Ecological environmental protection vegetable planting system |
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2020
- 2020-06-03 CN CN202010492560.9A patent/CN111603917A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204563991U (en) * | 2015-02-26 | 2015-08-19 | 江苏今日卫生用品有限公司 | A kind of liquid stirring device |
| CN109751882A (en) * | 2019-01-09 | 2019-05-14 | 刘童童 | A kind of metal vacuum smelting reduction furnace |
| CN110839448A (en) * | 2019-11-28 | 2020-02-28 | 周振豪 | Ecological environmental protection vegetable planting system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090239A (en) * | 2020-09-21 | 2020-12-18 | 郑夏媛 | Toxic gas collecting equipment for asphalt paving in high-temperature environment |
| CN112275094A (en) * | 2020-10-14 | 2021-01-29 | 胡高乐 | Self-suction type toxic gas absorption equipment for asphalt paving |
| CN112546493A (en) * | 2020-12-08 | 2021-03-26 | 罗玉敏 | Fireproof alarm structure for cable trench of transformer substation |
| CN112815304A (en) * | 2020-12-31 | 2021-05-18 | 新兴铸管股份有限公司 | Combustion device and annealing furnace combustion system |
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Application publication date: 20200901 |
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