CN214332714U - Equipment for treating garbage by catalytic decomposition of dioxin - Google Patents
Equipment for treating garbage by catalytic decomposition of dioxin Download PDFInfo
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- CN214332714U CN214332714U CN202120379936.5U CN202120379936U CN214332714U CN 214332714 U CN214332714 U CN 214332714U CN 202120379936 U CN202120379936 U CN 202120379936U CN 214332714 U CN214332714 U CN 214332714U
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Abstract
The utility model relates to a device for treating garbage by catalytic decomposition of dioxin, which consists of a temperature automatic control device, a pressure safety alarm device, a control device for oxygen content in flue gas, a feeding device, an incinerator, an air blower, a clinker box, a desulphurization device, a catalytic fixed bed, an alkali liquor spray tower, an alkali liquor circulating pump, an activated carbon adsorption box, a UV photolysis waste gas purifier, a draught fan, a chimney and an automatic control screen, wherein the automatic control screen is provided with a temperature controller, a pressure alarm, an oxygen content monitor and a wind controller in the flue gas; the utility model discloses can fall to the dioxin concentration in the flue gas and be less than national standard 0.1ng TEQ/m3The index of, the utility model discloses an equipment belongs to the equipment known in the industry, and the operation is reliable, and the technology is mature, simple structure, easy maintenance, low in cost can carry out scale, innoxious and minimizing treatment with rubbish, has good application prospect and industrial applicability.
Description
Technical Field
The utility model relates to a msw incineration's equipment specifically relates to adopt the equipment of dioxin treatment rubbish in the catalytic decomposition flue gas, belongs to the environmental protection equipment field.
Background
Household garbage (comprising waste plastics, waste rubber, paper scraps, wood, cloth, roots, leaves and grass) and organic waste inevitably generate dioxin harmful gas substances in incineration; dioxin belongs to chloro tricyclic aromatic compounds, is a general name of polychlorinated dibenzodioxin (PCDD) and chlorinated dibenzofuran (PCDF), and is a mixture consisting of more than 200 isomers, homologs and the like; dioxin is a colorless and tasteless solid substance in a standard state, has a melting point of 303-305 ℃, is stable in chemical property, has low solubility in water, is insoluble in water, is not volatile at normal temperature, is difficult to oxidize, decompose or hydrolyze, has strong toxicity, is a first-level carcinogenic and teratogenic substance, and has great damage to a human body; dioxin is a main pollutant and toxic substance generated in waste incineration; at present, the garbage incineration widely adopts a 3T + E technology to control the generation of dioxin (PCDD/F) in a hearth, and the 3T + E technology can only reduce the generation of dioxin due to the diversity of garbage raw materials in China and the nonuniformity of incineration temperature in the hearth; at present, the dioxin in flue gas is removed by waste incineration mainly by adopting activated carbon, and finally the dioxin is collected and removed by a bag type dust collector, the activated carbon adsorbing the dioxin and dust is also called as household waste incineration fly ash, belongs to HW18 hazardous wastes in the mouth of national hazardous waste records, and has great harm to the environment and the human health; according to the Standard for controlling incineration of domestic waste (6B 18485-2014): the fly ash from the incineration of the household garbage is managed according to dangerous waste, and the fly ash is generally subjected to harmless treatment by adopting solidification or hot melting high-cost treatment equipment; the process flow for decomposing dioxin at high temperature by using 3T + E or treating dioxin by adopting activated carbon adsorption is long, the treatment equipment is complex, the cost is high, and the comprehensive operation cost of garbage treatment is greatly increased;
the prior art has disclosed some solutions to this problem, such as: the applicant of the present invention discloses that the domestic garbage is treated by adopting the dry distillation mode of non-incineration method under the anaerobic condition in the authorized USP6, 133 and 491, a method and a device for preparing hydrocarbons from the domestic garbage and/or organic wastes, an authorized ZL200710130127.5, a method for continuously treating the domestic garbage and an authorized ZL98117823.5, a method and a device for preparing hydrocarbons from the domestic garbage and/or the organic wastes, and the advantages of no generation of dioxin are provided, and the problems are that: the device belongs to an indirect heating mode of garbage, the heat transfer effect of indirect heating is poor, the energy consumption of garbage dry distillation is high, the garbage can be completely decomposed only by heating the dry distillation device by additional supplementary fuel, and the operation cost of garbage treatment is greatly increased;
generally, a small and medium-sized garbage incineration device is not provided with a secondary combustion chamber, during garbage incineration with insufficient oxygen supply and uneven combustion, smoke contains a large amount of high-boiling organic polymer tar and heavy hydrocarbon substances, in the process of cooling in the post-process of the smoke, gas-phase tar molecules and heavy hydrocarbon molecules in the smoke are easily condensed into viscous liquid and tar, the viscous liquid and tar easily block equipment and pipelines, and surface pores of a dioxin decomposition catalyst are easily blocked, so that the catalyst is poisoned and loses efficacy, and the purification treatment of the smoke generated by the garbage incineration is greatly influenced; the existing UV photolysis waste gas purifier and plasma waste gas purifier can only decompose Volatile Organic Compounds (VOCs) at room temperature, i.e. small molecular non-methane hydrocarbons (NMHCs), gas-phase oxygen-containing organic compounds, gas-phase halogenated hydrocarbons, gas-phase nitrogen-containing organic compounds and gas-phase sulfur-containing organic compounds which are in gas phase at room temperature, and cannot decompose viscous liquid and tar at room temperature.
Disclosure of Invention
The utility model discloses the clear purpose is exactly to compensate prior art's lack, provides thoroughly decompose the dioxin in the flue gas and become carbon dioxide, water and hydrogen chloride under the effect of fixed bed catalyst, and rethread alkali lye spray column removes hydrogen chloride's refuse handling installation.
The utility model is realized in the following way, a device for treating garbage by catalytic decomposition of dioxin, which consists of a temperature automatic control device, a pressure safety alarm device, a control device for oxygen content in flue gas, a feeding device, an incinerator, a blower, a ash box, a desulphurization device, a catalytic fixed bed, an alkali liquor spray tower, an alkali liquor circulating pump, an activated carbon adsorption box, a UV photolysis waste gas purifier, a fan, a chimney and an automatic control screen; wherein, the automatic control screen (31) is provided with a temperature controller (28), a pressure alarm (38), an oxygen content monitor (39) in the smoke and a wind controller (37); the temperature controller (28) is connected with a temperature sensor arranged on the incinerator (3) through a conducting wire; the pressure alarm (38) is connected with a pressure sensor arranged on the incinerator (3) through a conducting wire; the oxygen content monitor (39) is connected with an oxygen content monitoring sensor (16) on the flue gas pipe (10) through a conducting wire (40); the air volume controller (37) is connected with the blower (4) through a conducting wire; the discharge hole of a feeding device (1) is communicated with the feed inlet (2) of the incinerator, the outlet of a blower (4) is communicated with an air inlet chamber (6) at the lower part of the incinerator through a pipeline, the flue gas outlet (9) of the incinerator is communicated with the air inlet (11) of a desulfurizing device (13) through a flue gas pipe (10), the exhaust port (14) of the desulfurizing device is communicated with the air inlet of a catalytic fixed bed (15) through a pipeline, the air outlet (17) of the catalytic fixed bed is communicated with the air inlet (19) of an alkali liquor spray tower through a fixed bed exhaust pipe (18), the inlet of an alkali liquor circulating pump (25) is communicated with an alkali liquor outlet pipe (24) of the alkali liquor spray tower, the outlet of the alkali liquor circulating pump (25) is communicated with a liquid sprayer (36) in the alkali liquor spray tower (21) through an alkali liquor circulating pipe (23), and the air outlet (20) of the alkali liquor spray tower is communicated with the air inlet (26) of an activated carbon adsorption tank (27) through an air outlet pipe (22) of the alkali liquor spray tower, the gas vent and UV photodissociation exhaust gas cleaner air inlet (29) UNICOM of active carbon adsorption case (27), the gas outlet and draught fan (32) air inlet UNICOM of UV photodissociation exhaust gas cleaner (30), the gas outlet of draught fan (32) is through the flue gas inlet UNICOM of draught fan blast pipe (33) with chimney (34).
The feeding device (1) belongs to a known spiral feeder or a reciprocating pusher;
the incinerator (3) is a known vertical incinerator or a pyrolysis gasifier for anoxic combustion;
the desulfurizer (13) belongs to a conventional industrial gas desulfurizer, is a fixed bed and is divided into a vertical type, a cylindrical type, a multilayer type and a horizontal type, the desulfurizer belongs to granular, strip or honeycomb solid, such as a zinc oxide desulfurizer, an iron oxide desulfurizer or a magnesium oxide desulfurizer, and the solid desulfurizer is placed on a sieve plate in the desulfurizer (13).
The catalytic fixed bed (15) belongs to a known gas-solid catalytic reaction fixed bed used in industry, and is a cylindrical or cubic shell, a fixed bed gas inlet (42) and a fixed bed gas outlet (17) are arranged on the shell, a perforated partition plate (41) is arranged in the shell, a granular or honeycomb catalyst is placed on the perforated partition plate (41), flue gas passes through the fixed bed gas inlet (42), sequentially passes through an SR-1 catalyst (43), an MH-1 cocatalyst (44) and an MH-2 catalyst (45) to perform catalytic reaction, and gas after the catalytic reaction is discharged through the fixed bed gas outlet (17) (see figure 2).
The alkali liquor spray tower (21) belongs to a known boiler flue gas purification alkali liquor spray device, alkali liquor is caustic soda solution and lime milk, an outlet of an alkali liquor circulating pump (25) is communicated with an inlet of a liquid sprayer (36) at the middle upper part in the tower (21) through an alkali liquor circulating pipeline (23), a gas-water separation sieve plate is arranged at the upper part in the tower (21), and a gas outlet (20) of the alkali liquor spray tower is arranged at the top of the tower (21).
The activated carbon adsorption box (27) belongs to a known activated carbon adsorption device (commodity) for flue gas purification, and activated carbon fibers or honeycomb activated carbon are arranged in the activated carbon adsorption box and can adsorb organic matters, tar and dust in flue gas.
The UV photolysis waste gas purifier (30) belongs to a known organic waste gas decomposition device (commodity), and can decompose Volatile Organic Compounds (VOCs) in flue gas at room temperature into carbon dioxide and water.
The desulfurizer in the desulfurizer (13) is granular ferric oxide desulfurizer, granular zinc oxide desulfurizer or other known flue gas desulfurizer, preferably granular ferric oxide desulfurizer.
The granular or honeycomb catalyst for cracking high molecular hydrocarbons and tar in the catalytic fixed bed (15) is a conventional hydrocarbon thermal cracking catalyst commodity, and the SR-1 catalyst (43) is preferably selected in the utility model.
The granular or honeycomb catalyst for decomposing dioxin in the catalytic fixed bed (15) can select the known dioxin decomposition catalyst (commodity), the utility model discloses preferred MH-1 cocatalyst (44) and MH-2 catalyst (45) are produced by Beijing kang Qiao century environmental science and technology Limited.
The garbage comprises domestic garbage, medical garbage, kitchen garbage, agriculture and forestry organic garbage, waste plastics, waste rubber, waste electronic products, waste clothes, circuit boards, leather, waste medicinal materials, other organic wastes and industrial organic wastes.
The utility model discloses in, dioxin in the flue gas is decomposed into carbon dioxide, water and hydrogen chloride under the catalytic action, and its chemical reaction principle is as follows:
spraying a tower (21) by using alkali liquor (caustic soda and lime milk) to remove acid gas (NO) in the smoke2、 H2S、SO3...) removing hydrogen chloride generated by decomposition of dioxin, and removing with alkaline solution to perform acid-base neutralization reaction;
HCL+Ca(OH)2→CaCL2+H2O
H2S+Ca(OH)2→CaS+H2O
NO2+Ca(OH)2→Ca(NO3)2+H2O
SO3++Ca(OH)2→CaSO4+H2O
SO2++Ca(OH)2→CaSO3+H2O
in the catalytic fixed bed (15), a honeycomb-shaped or granular MH-1 cocatalyst (44) and/or MH-2 catalyst (45) for decomposing dioxin and an SR-1 catalyst (43) for decomposing organic hydrocarbon and tar are filled; SR-1 catalyst (43) has been disclosed in ZL98117823.5 entitled "method and apparatus for producing hydrocarbons from domestic waste and/or organic waste" and U.S. Pat. No.6,133,491 "Process and apparatus for producing hydrocarbons from hydrocarbon wastes or wastes" by the present applicant;
the utility model has the advantages that:
1. the utility model is provided with a flue gas desulphurization device (13) in front of the dioxin decomposition catalysis fixed bed (15), thus solving and eliminating the problem that the dioxin catalyst is poisoned and loses efficacy due to high molecular hydrocarbon and tar in the flue gas;
3. the utility model discloses can reduce the dioxin concentration in the flue gas to 0.083ngTEQ/m30.1ngTEQ/m lower than national standard3The catalytic activity reaches 93.08%, and the method has good application prospect;
4. the equipment of the utility model belongs to the equipment known in industry, and has reliable operation, mature technology, simple structure, convenient maintenance and low cost;
5. the utility model discloses enable among the msw incineration dioxin concentration of fume emission and reach the standard of national regulation, can burn rubbish to ashes completely, carry out the innoxious of rubbish, have good industrial applicability.
Drawings
FIG. 1 is a flow chart of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the catalyst configuration in the catalytic fixed bed of the present invention;
in the figure and 1 figure 2, 1-feeding device, 2-incinerator feeding inlet, 3-incinerator, 4-blower, 5-cinder box, 6-air inlet chamber, 7-incinerator observation door, 8-grate, 9-incinerator flue gas outlet, 10-flue gas pipe, 11-desulfurizer air inlet, 12-desulfurizer, 13-desulfurizer, 14-desulfurizer exhaust port, 15-catalytic fixed bed, 16-oxygen content monitoring sensor, 17-fixed bed gas outlet, 18-fixed bed exhaust pipe, 19-alkali liquor spray tower air inlet, 20-alkali liquor spray tower air outlet, 21-alkali liquor spray tower, 22-alkali liquor spray tower air outlet pipe, 23-alkali liquor circulating pipeline, 24-alkali liquor spray tower alkali liquor outlet pipe, 25-alkali liquor circulating pump, 26-air inlet of active carbon adsorption box, 27-active carbon adsorption box, 28-temperature controller, 29-air inlet of UV photolysis waste gas purifier, 30-UV photolysis waste gas purifier, 31-automatic control screen, 32-induced draft fan, 33-induced draft fan exhaust pipe, 34-chimney, 35- "gas-water" separation sieve plate, 36-liquid sprayer, 37-air volume controller, 38-pressure alarm, 39-oxygen content monitor, 40-conduction line, 41-partition plate with holes, 42-fixed bed gas inlet, 43-SR-1 catalyst, 44-MH-1 cocatalyst and 45-MH-2 catalyst.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, but is not limited thereto.
Examples
As shown in FIGS. 1 and 2, 1500Kg of domestic garbage was charged into an incinerator (3) (vertical incinerator, cylindrical body, hearth inner diameter 1500mm, height 2500mm, charging volume 5.89 m) by means of a reciprocating feeder (1)3) Internal; start 2300m3A blower (4) which adjusts the rotating speed and the ventilation quantity of the blower (4) by an air quantity controller (37) and an oxygen content monitor (39) on an automatic control screen (31), an oxygen content monitoring sensor (16) is arranged on a flue gas outlet pipe (10) of the incinerator (3), the oxygen content in the flue gas is controlled to be 6-7%, a proper amount of air is sent into the garbage incinerator (3) to incinerate the garbage, the temperature in the incinerator (3) is controlled to be 240-600 ℃, the pressure is 0.02-0.08MPa, the garbage in the incinerator (3) is incinerated to be ashes after 152 minutes, and the ash slag after the garbage incineration falls into an ash slag box (5) at the bottom of the incinerator (3) to be discharged periodically; the flue gas from the garbage incineration is discharged from the incinerator (3) and then is conveyed into a desulfurizing device (13) filled with granular iron oxide desulfurizing agent, and H in the flue gas is removed by the desulfurizing agent2S、SO3And SO2In order to prevent poisoning damage of sulfide to the catalyst in the catalytic fixed bed (15), the flue gas discharged from the desulfurization device (13) is introduced into the catalytic fixed bed (15), and an SR-1 catalyst (43), an MH-1 cocatalyst (44) and an MH-2 catalyst (45) are arranged in the catalytic fixed bed (15), as shown in FIG. 2; the catalytic reaction temperature in the catalytic fixed bed (15) is controlled at 210-350 ℃, the space velocity of the flue gas is 2300/h, and the flue gas is firstly mixed with the SR-1 catalyst ((S-R))43) The method comprises the steps of contacting, cracking organic macromolecular hydrocarbons and tar in the flue gas into Volatile Organic Compounds (VOCs) at room temperature by an SR-1 catalyst (43), enabling the flue gas to flow through an MH-1 cocatalyst (44) and an MH-2 catalyst (45), decomposing dioxin in the flue gas into carbon dioxide, water and hydrogen chloride under the action of the MH-1 cocatalyst (44) and the MH-2 catalyst (45), discharging the gas in a catalytic fixed bed (15), conveying the gas into a lime milk spray tower (21) (10% calcium oxide emulsion) for gas deacidification treatment, and removing HCL and CO in the flue gas2、NO2、SO2、H2S and dust; the gas in the alkali liquor spray tower (21) is dehydrated through a gas-liquid separation sieve plate (35), the gas is introduced into an activated carbon adsorption box (27) for purification treatment, the gas discharged from the activated carbon adsorption box (27) is introduced into a UV photolysis waste gas purifier (30) with power of 3000w, Volatile Organic Compounds (VOCs) in the flue gas are decomposed into carbon dioxide and water, the standard-reaching gas discharged from the UV photolysis waste gas purifier (30) is discharged into the atmosphere through a draught fan (32) and a chimney (34), inorganic residues after garbage incineration are discharged from an ash box (5), and the ash can be buried and also can be used as a building material raw material after metal recovery, crushing and purification through a magnetic separator.
In the process of 152 minutes of waste incineration, a gas discharged from a chimney was continuously sampled for 120 minutes in the field of dioxin production by using a krey ZR-3720 type dioxin flue gas sampler, and analyzed by using a Thermo DFS magnetic mass spectrometer (GC/MS), and analyzed and detected for dioxin according to the regulations of "isotope dilution high resolution gas chromatography-high resolution mass spectrometry for measuring dioxins in exhaust gas" (HJ 77. -2008).
The following main data and results are obtained through the process:
domestic garbage: 1500 KG:
physical properties of the garbage (Wt%): 36.6 percent of water, 63.4 percent of total solids (comprising carbohydrates, waste plastics, waste rubber, metals, inorganic matters and the like), 8.1 of pH value and 0.49 ton/m of garbage volume weight3；
1500kg of garbage occupies the volume: 3.06m3；
Incinerator 2The charging volume of the hearth is as follows: 5.89m3；
Analyzing garbage elements: h7.43% (wt%); c24.5% (wt%); o50.27% (wt%); 0.35 percent of S; n1.6% (wt%); 15.85% (wt%) of metal and inorganic matter;
in the incinerator (3): the incineration temperature is 280-3/h；
The garbage incineration treatment time is as follows: 152 minutes;
inorganic residues and metals: 237.8 kg;
average density of residue and metal: 2.12 ton/m3Or 0.47m3Per ton;
237.8kg residue and metals on volume: 0.11m3[ i.e., 0.47X 0.2378]；
The residual burning rate (V%) of the garbage slag is as follows: 3.65% [ (0.11 ÷ 3.06) × 100% ];
volume reduction rate of garbage (V%): 96.35% [ 100% -3.65% ];
desulfurizing agent parameters in the desulfurizing device (13):
color and appearance: the rufous quadrangular cylindrical particles are arranged on a sieve plate in the desulfurization fixed bed;
the desulfurizing agent comprises the following components: a complex of iron oxide and zinc oxide;
specification (mm): phi 5X 5-15 mm;
intensity (N/cm): not less than 50;
bulk density (kg/L): 0.75-0.8;
penetration sulfur capacity: more than or equal to 30 percent;
the original particle size of the product penetrates through the sulfur capacity: the penetration sulfur capacity is detected by HG/T4354-2012 standard to be 31.5 percent at more than or equal to 30 percent;
the content of the hydrogen sulfide desulfurizer calculated by iron element is more than or equal to 30 percent
The content is more than or equal to 50 percent calculated by ferric oxide;
catalyst parameters in the catalytic fixed bed (15):
hydrocarbon and tar cracking catalysts: SR-1(43), honeycomb shape, external dimension 15cm x 15 cm;
dioxin decomposition catalyst: MH-1 cocatalyst (44) and MH-2 catalyst (45),pore density: 21 holes/cm2The arrangement of the catalyst in the catalytic fixed bed is shown in figure 2;
temperature of catalytic reaction: 220 ℃ and 350 ℃;
pressure in the catalytic fixed bed 5: 0.03-0.08 MPa;
space velocity of catalytic reaction: 1800 plus 2000h-1；
Dioxin test parameters in flue gas:
average oxygen content in flue gas: 6.5 percent;
dioxin sampling apparatus: a Zhongrui ZR-3720 type dioxin flue gas sampler;
dioxins analyzer: thermo DFS magnetic mass spectrometer (GC/MS);
sampling time of flue gas: 120 minutes;
and (3) testing results of dioxin in the discharged flue gas: 0.083ngTEQ/m3And the content of dioxin is less than 0.1ngTEQ/m lower than that specified in national standard (GB18485-2014) standard for controlling pollution of domestic waste incineration3。
Claims (1)
1. The equipment for treating garbage by catalytically decomposing dioxin comprises a temperature automatic control device, a pressure safety alarm device, a control device for oxygen content in flue gas, a feeding device, an incinerator, a blower, a ash residue box, a desulfurization device, a catalytic fixed bed, an alkali liquor spray tower, an alkali liquor circulating pump, an activated carbon adsorption box, a UV photolysis waste gas purifier, a fan, a chimney and an automatic control screen; the method is characterized in that: the automatic control screen (31) is provided with a temperature controller (28), a pressure alarm (38), an oxygen content monitor (39) in the smoke and a wind controller (37); the temperature controller (28) is connected with a temperature sensor arranged on the incinerator (3) through a conducting wire; the pressure alarm (38) is connected with a pressure sensor arranged on the incinerator (3) through a conducting wire; the oxygen content monitor (39) is connected with an oxygen content monitoring sensor (16) on the flue gas pipe (10) through a conducting wire (40); the air volume controller (37) is connected with the blower (4) through a conducting wire; the discharge hole of a feeding device (1) is communicated with the feed inlet (2) of the incinerator, the outlet of a blower (4) is communicated with an air inlet chamber (6) at the lower part of the incinerator through a pipeline, the flue gas outlet (9) of the incinerator is communicated with the air inlet (11) of a desulfurizing device (13) through a flue gas pipe (10), the exhaust port (14) of the desulfurizing device is communicated with the air inlet of a catalytic fixed bed (15) through a pipeline, the air outlet (17) of the catalytic fixed bed is communicated with the air inlet (19) of an alkali liquor spray tower through a fixed bed exhaust pipe (18), the inlet of an alkali liquor circulating pump (25) is communicated with an alkali liquor outlet pipe (24) of the alkali liquor spray tower, the outlet of the alkali liquor circulating pump (25) is communicated with a liquid sprayer (36) in the alkali liquor spray tower (21) through an alkali liquor circulating pipe (23), and the air outlet (20) of the alkali liquor spray tower is communicated with the air inlet (26) of an activated carbon adsorption tank (27) through an air outlet pipe (22) of the alkali liquor spray tower, the gas vent and UV photodissociation exhaust gas cleaner air inlet (29) UNICOM of active carbon adsorption case (27), the gas outlet and draught fan (32) air inlet UNICOM of UV photodissociation exhaust gas cleaner (30), the gas outlet of draught fan (32) is through the flue gas inlet UNICOM of draught fan blast pipe (33) with chimney (34).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225584A (en) * | 2021-12-15 | 2022-03-25 | 山东金三宝环保设备有限公司 | Automatic sacrificial article incinerator for reducing dioxin emission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225584A (en) * | 2021-12-15 | 2022-03-25 | 山东金三宝环保设备有限公司 | Automatic sacrificial article incinerator for reducing dioxin emission |
| CN114225584B (en) * | 2021-12-15 | 2023-02-24 | 山东金三宝环保设备有限公司 | Automatic sacrificial article incinerator for reducing dioxin emission |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hejide (Beijing) Ecological Technology Co.,Ltd. Assignor: Zhou Dingli Contract record no.: X2022990000175 Denomination of utility model: A device for catalytic decomposition of dioxin for waste treatment Granted publication date: 20211001 License type: Common License Record date: 20220325 |