CN110448953A - A kind of garbage degradation experimental provision - Google Patents
A kind of garbage degradation experimental provision Download PDFInfo
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- CN110448953A CN110448953A CN201910568157.7A CN201910568157A CN110448953A CN 110448953 A CN110448953 A CN 110448953A CN 201910568157 A CN201910568157 A CN 201910568157A CN 110448953 A CN110448953 A CN 110448953A
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- 238000006731 degradation reaction Methods 0.000 title claims abstract description 43
- 230000015556 catabolic process Effects 0.000 title claims abstract description 39
- 238000012360 testing method Methods 0.000 claims abstract description 59
- 238000009413 insulation Methods 0.000 claims abstract description 34
- 241000272814 Anser sp. Species 0.000 claims abstract description 17
- 239000011435 rock Substances 0.000 claims abstract description 17
- 238000004321 preservation Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims 1
- 238000005187 foaming Methods 0.000 claims 1
- 230000008595 infiltration Effects 0.000 claims 1
- 238000001764 infiltration Methods 0.000 claims 1
- 230000006872 improvement Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 238000011026 diafiltration Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 239000002937 thermal insulation foam Substances 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000005439 thermosphere Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/02—Combinations of filters of different kinds
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A kind of garbage degradation experimental provision is connected to the top cover on test chamber including test chamber and removable seal, and the top cover is equipped with one end and is interspersed in the appendix in test chamber, and test chamber bottom wall is provided with percolate drainage hole;Upper insulating layer is equipped in the test chamber upper end, geotechnological strainer grid is successively arranged above test chamber bottom wall from top to bottom, goose warms up rock layers and lower insulating layer, percolate mesh is provided on the lower insulating layer, space in test chamber between upper insulating layer and upper geotechnological strainer grid is for placing junk-heap body, thermal insulation layer is equipped in the lower section of lower insulating layer in the test chamber, the through-hole coaxial with drainage hole is provided on thermal insulation layer, thermal insulation layer upper surface is equipped with by the four inclined inclined-planes in circumferential through-hole axle center;The test chamber bottom is equipped with drain pipe at drainage hole, and drain pipe is equipped with draining switch.The present invention greatly reduces the thermal loss of garbage degradation process, in order to which garbage degradation experimental study provides effective guarantee.
Description
Technical field
The present invention relates to garbage degradation technical fields, and in particular to a kind of garbage degradation experimental provision.
Background technique
In recent years, China's generation is huge and soaring rapidly, and landfill is the common processing mode of house refuse, is
The major way of China's garbage disposal at present, and leading position will be occupied in certain time from now on.Refuse landfill essence
It is a biochemical reaction heap, the output substance of the reactor is Leachate site and gas.The collection and processing of landfill leachate
It is one of problem main during refuse landfill is runed.
In Geotechnical Engineering field, gas rule are produced in order to obtain the refuse landfill degradation of different regions, different ratio
Rule realizes rubbish gas resource utilization, it is often necessary to carry out garbage degradation experimental study.Influence garbage degradation because being known as very
It is more, including temperature, the content of organic matter, moisture content etc., the content of organic matter and moisture content can be by manually matching rubbish
It is controlled than realizing, the control for temperature, present most of experiment is all that the locking device equipped with rubbish sample is put into hot water
Manual temperature's control is carried out in bath, and the actual temperature of rubbish sample is replaced with the temperature that water temperature or vessel surface are read, is obtained
The degradation gas production of rubbish sample at a certain temperature.
Garbage degradation test apparatus is numerous at present, and majority has the function of percolate acquisition and recharge, if cannot be timely
Effectively it will cause many problems for acquisition and recharge percolate: (1) hole that supplied gas circulates between rubbish is blocked up by percolate
Plug, the relatively low methane that easily causes of collecting methane efficiency leak, and fire and explosion accident (2) junk-heap body permeability is caused to decline,
It is not easy to form sufficient aerobic environment in aerobic engineering, recovery project is caused to be made slow progress.But traditional garbage degradation test
Instrument does not design percolate acquisition system specially mostly, is on the one hand the limitation due to cost, is on the other hand percolate acquisition
The temperature that system will lead to junk-heap body locally declines, and makes the temperature difference inside junk-heap body larger, can tie in this way to test
Fruit influence is very huge, affects the research to the hot release rule of garbage degradation.And some garbage degradation test apparatuses are directly adopted
Percolate is discharged with horizontal guide well, horizontal guide well includes the discharge guiding pipe and rubble being successively arranged from inside to outside, and metalling is rigid
Property is strong, stress is directly passed to discharge guiding pipe when by compared with big load, resiliency is poor.
Therefore, in view of this, applicants contemplate that provide a kind of can solve that junk-heap body internal difference in temperature is big and diafiltration simultaneously
The garbage degradation test apparatus of liquid acquisition problems, is of great significance.
Summary of the invention
Present invention aims to overcome that the shortcomings that prior art and deficiency, provide a kind of garbage degradation experimental provision, both
It is able to achieve junk-heap body percolate highly effective gathering, and the thermal and insulating performance of testing equipment can be improved, for garbage degradation test
Research provides effective guarantee.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of garbage degradation experimental provision, the top on test chamber is connected to including test chamber and removable seal
Lid, the top cover are equipped with one end and are interspersed in the appendix in test chamber, and the test chamber bottom wall is provided with percolate drain
Hole;It is equipped with upper insulating layer in the test chamber upper end, is successively arranged geotechnique from top to bottom above the test chamber bottom wall
Strainer grid, goose warm up rock layers and lower insulating layer, and percolate mesh is provided on the lower insulating layer, and test chamber is interior in upper insulating layer
Space between upper geotechnological strainer grid is equipped in the test chamber in the lower section of lower insulating layer for placing junk-heap body
Thermal insulation layer, the through-hole coaxial with drainage hole is provided on thermal insulation layer, and thermal insulation layer upper surface is equipped with inclined by four circumferential through-hole axle center
Inclined-plane;The test chamber bottom is equipped with drain pipe at drainage hole, and drain pipe is equipped with draining switch.
From the foregoing, it will be observed that being filtered in the use of the present invention, junk-heap body is placed in test chamber in upper insulating layer and upper geotechnique
Then space between grid is ventilated by appendix to junk-heap body, can start to carry out garbage degradation experiment.The present invention
The thermal and insulating performance of garbage degradation test apparatus is improved, meanwhile, it is equipped with insulating layer in test chamber upper and lower side, and
The lower section of lower insulating layer is equipped with thermal insulation layer, the diafiltration that thermal insulation layer is only provided with a through-hole and will be flowed out from lower insulating layer using inclined-plane
It is flowed out after liquid aggregation from through-hole, so that mesh is spaced with the external world on lower insulating layer, greatly reduces the heat of garbage degradation process
Loss guarantees the consistency of junk-heap body bulk temperature, in order to which garbage degradation experimental study provides effective guarantee;In addition it adopts
Drainage hole can be blocked as barrier layer to avoid the outflow of rubbish fragment by warming up rock layers with geotechnological strainer grid and goose, and goose
Warm rock layers have the less plane of fracture compared to rubble, can be reduced the absorption to percolate;It is warm also by upper geotechnological strainer grid, goose
The through-hole in gap, the percolate mesh of lower insulating layer and thermal insulation layer is formed together the filtration channel of percolate between rock layers, both
It is able to achieve the acquisition of junk-heap body percolate, reduces the loss of percolate, improves percolate collecting efficiency, and testing equipment can be improved
Thermal and insulating performance.
As an improvement of the present invention, heat-insulation switch, the guarantor are equipped in the top of draining switch in the drain pipe
Temperature switch includes piston rod and the heat preservation piston for being fixed on piston rod upper end, and heat preservation piston is located in drainage hole, sets on piston rod
There is the guide rod perpendicular to piston rod, drain pipe is equipped with vertical pilot hole, and outer end of guide rod is protruding across pilot hole and can edge
Pilot hole slides up and down and heat preservation piston is made to be opened or closed drainage hole, and drain pipe is equipped with the limit knot for limiting guide rod position
Structure.
Further, the drain pipe upper end is equipped with up-small and down-big stepped hole, is equipped between stepped hole small end and big end
The transition conical surface, the aperture of drainage hole and the aperture of stepped hole small end are equal.
As an improvement of the present invention, the position limiting structure includes the rack gear being located on pilot hole two sidewalls, on guide rod
Equipped with the teeth matched with rack gear.
Further, the heat preservation piston is made of heat-insulation foam material.
As an improvement of the present invention, the goose, which is warmed up, is equipped with lower geotechnological strainer grid between rock layers and lower insulating layer.
As an improvement of the present invention, the portion on the test chamber between upper insulating layer and upper geotechnological strainer grid
Temperature sensor, middle temperature sensor and lower temperature sensor are from top to bottom successively arranged in section.
As an improvement of the present invention, the upper insulating layer, lower insulating layer and thermal insulation layer are all made of thermosetting property thermal insulating material
Material is made.
As an improvement of the present invention, the gradient on the inclined-plane of the thermal insulation layer upper surface is greater than or equal to 3 °.
Further, the gradient on the inclined-plane of the thermal insulation layer upper surface is 5 °.
Further, the test chamber is connected with top cover thread seal.
Compared with prior art, the invention has the following advantages that
Present invention improves over the thermal and insulating performances of garbage degradation test apparatus, meanwhile, in test chamber upper and lower side
It is equipped with thermal insulation layer equipped with insulating layer, and in the lower section of lower insulating layer, thermal insulation layer is only provided with a through-hole and will be under using inclined-plane
It is flowed out after the percolate aggregation of insulating layer outflow from through-hole, so that mesh is spaced with the external world on lower insulating layer, greatly reduces rubbish
The thermal loss of rubbish degradation process guarantees the consistency of junk-heap body bulk temperature, in order to which garbage degradation experimental study provides
It is effective to ensure;
In addition rock layers are warmed up as barrier layer using upper geotechnological strainer grid and goose, can be blocked to avoid the outflow of rubbish fragment
Drainage hole, and goose warms up rock layers and has the less plane of fracture compared to rubble, can be reduced the absorption to percolate;
Gap between rock layers, the percolate mesh of lower insulating layer and heat-insulated are warmed up also by upper geotechnological strainer grid, goose
The through-hole of layer is formed together the filtration channel of percolate, had both been able to achieve junk-heap body percolate highly effective gathering, and had reduced percolate
Loss improves percolate collecting efficiency, and can improve the thermal and insulating performance of testing equipment.
Detailed description of the invention
Fig. 1 is the schematic diagram of garbage degradation experimental provision of the present invention;
Fig. 2 is the schematic diagram of garbage degradation experimental provision drain pipe of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
Embodiment
Fig. 1 to Fig. 2 is please referred to, to achieve the above object, The technical solution adopted by the invention is as follows:
A kind of garbage degradation experimental provision, is connected on test chamber 10 including test chamber 10 and removable seal
Top cover 11, the top cover 11 are equipped with one end and are interspersed in the appendix 20 in test chamber 10, and 10 bottom wall of test chamber is opened
There is percolate drainage hole 12;
It is equipped with upper insulating layer 30 in 10 upper end of test chamber, above 10 bottom wall of test chamber from top to bottom successively
Rock layers 50 and lower insulating layer 60 are warmed up equipped with upper geotechnological strainer grid 40, goose, percolate mesh is provided on the lower insulating layer 60, tries
The space in container 10 between upper insulating layer 30 and upper geotechnological strainer grid 40 is tested for placing junk-heap body 100, the examination
It tests in container 10 and is equipped with thermal insulation layer 70 in the lower section of lower insulating layer 60, be provided with the through-hole coaxial with drainage hole 12 on thermal insulation layer 70
71,70 upper surface of thermal insulation layer is equipped with by the inclined inclined-plane in four circumferential through-holes, 71 axle center;
10 bottom of test chamber is equipped with drain pipe 80 at drainage hole 12, and drain pipe 80 is equipped with draining switch 81.
From the foregoing, it will be observed that being filtered in the use of the present invention, junk-heap body is placed in test chamber in upper insulating layer and upper geotechnique
Then space between grid is ventilated by appendix to junk-heap body, can start to carry out garbage degradation experiment.The present invention
The thermal and insulating performance of garbage degradation test apparatus is improved, meanwhile, it is equipped with insulating layer in test chamber upper and lower side, and
The lower section of lower insulating layer is equipped with thermal insulation layer, the diafiltration that thermal insulation layer is only provided with a through-hole and will be flowed out from lower insulating layer using inclined-plane
It is flowed out after liquid aggregation from through-hole, so that mesh is spaced with the external world on lower insulating layer, greatly reduces the heat of garbage degradation process
Loss guarantees the consistency of junk-heap body bulk temperature, in order to which garbage degradation experimental study provides effective guarantee;In addition it adopts
Drainage hole can be blocked as barrier layer to avoid the outflow of rubbish fragment by warming up rock layers with geotechnological strainer grid and goose, and goose
Warm rock layers have the less plane of fracture compared to rubble, can be reduced the absorption to percolate;It is warm also by upper geotechnological strainer grid, goose
The through-hole in gap, the percolate mesh of lower insulating layer and thermal insulation layer is formed together the filtration channel of percolate between rock layers, both
It is able to achieve junk-heap body percolate highly effective gathering, reduces the loss of percolate, improves percolate collecting efficiency, and test can be improved
The thermal and insulating performance of equipment.
In the present embodiment, heat-insulation switch 82, the heat preservation are equipped in the top of draining switch 81 in the drain pipe 80
Switch 82 includes piston rod 821 and the heat preservation piston 822 for being fixed on 821 upper end of piston rod, and heat preservation piston 822 is located at drainage hole 12
Interior, piston rod 821 is equipped with the guide rod 823 perpendicular to piston rod 821, and drain pipe 80 is equipped with vertical pilot hole 83, guide rod 823
Outer end is protruding across pilot hole 83 and can slide up and down along pilot hole 83 and heat preservation piston 822 is made to be opened or closed drain
Hole 12, drain pipe 80 are equipped with the position limiting structure for limiting 823 position of guide rod.When not needing acquisition percolate, by heat-insulation switch
It closes, that is to say so that piston plug is kept the temperature in drainage hole, to prevent the temperature of junk-heap body to be lost from drainage hole, into one
Improve the thermal and insulating performance of device in step ground;When needing to acquire percolate, first heat-insulation switch is opened, that is to say and utilize guide rod
The piston rod that moves down makes to keep the temperature piston toward moving down into drain pipe, so that drain pipe is communicated with drainage hole, the then row of opening again
Liquid switch, can acquire percolate.Wherein, the heat preservation piston 822 is made of heat-insulation foam material, and heat-insulation foam material has
The advantages that thermal coefficient is low, corrosion-resistant, compression strength is high.
On above-mentioned basis, the present embodiment is further improved again, and 80 upper end of drain pipe is equipped with up-small and down-big ladder
Hole is equipped with the transition conical surface 87, the aperture of drainage hole 12 and the aperture of stepped hole small end 85 between stepped hole small end 85 and big end 86
It is equal.Drainage hole is smoothly passed in and out by stepped hole and the transition conical surface convenient for heat preservation piston.
In the present embodiment, the position limiting structure includes the rack gear 84 being located on 83 two sidewalls of pilot hole, is set on guide rod 823
There are the teeth matched with rack gear 84.By cooperating between rack gear and teeth, guide rod can be limited in the position of pilot hole, thus
Realize limit, it is at low cost easy to operate.
In the present embodiment, the goose, which is warmed up, is equipped with lower geotechnological strainer grid 90 between rock layers 50 and lower insulating layer 60.It is equipped with
Lower geotechnique's strainer grid can guarantee that goose warms up the flatness between rock layers and lower insulating layer.
In the present embodiment, the section on the test chamber 10 between upper insulating layer 30 and upper geotechnological strainer grid 40
On be from top to bottom successively arranged temperature sensor 13, middle temperature sensor 14 and lower temperature sensor 15.It is passed using upper temperature
Sensor, middle temperature sensor and lower temperature sensor can be with the temperature of the various pieces of real-time detection junk-heap body.
In the present embodiment, the upper insulating layer 30, lower insulating layer 60 and thermal insulation layer 70 are all made of thermosetting property thermal insulation material
It is made.And phenol formaldehyde foam, hard polyurethane foam etc., this kind of material good corrosion resistance, thermal coefficient may be selected in thermosetting property thermal insulation material
It is extremely low.
In the present embodiment, the gradient on the inclined-plane of 70 upper surface of thermal insulation layer is greater than or equal to 3 °.Specifically, it is described every
The gradient on the inclined-plane of 70 upper surface of thermosphere is 5 °.
In the present embodiment, the test chamber 10 is connected with 11 thread seal of top cover.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of garbage degradation experimental provision, it is characterised in that: be connected to test including test chamber and removable seal and hold
Top cover on device, the top cover are equipped with one end and are interspersed in the appendix in test chamber, and the test chamber bottom wall is provided with infiltration
Filtrate drainage hole;It is equipped with upper insulating layer in the test chamber upper end, is successively set from top to bottom above the test chamber bottom wall
There is upper geotechnological strainer grid, goose to warm up rock layers and lower insulating layer, be provided with percolate mesh on the lower insulating layer, in test chamber
For placing junk-heap body, the test chamber is interior in lower insulating layer in space between upper insulating layer and upper geotechnological strainer grid
Lower section is equipped with thermal insulation layer, and the through-hole coaxial with drainage hole is provided on thermal insulation layer, and thermal insulation layer upper surface is equipped with by four circumferential through-hole axis
The inclined inclined-plane of the heart;The test chamber bottom is equipped with drain pipe at drainage hole, and drain pipe is equipped with draining switch.
2. garbage degradation experimental provision according to claim 1, it is characterised in that: in draining switch in the drain pipe
Top is equipped with heat-insulation switch, and the heat-insulation switch includes piston rod and the heat preservation piston for being fixed on piston rod upper end, keeps the temperature piston
It is located in drainage hole, piston rod is equipped with the guide rod perpendicular to piston rod, and drain pipe is equipped with vertical pilot hole, and outer end of guide rod is worn
Cross pilot hole it is protruding and can be slided up and down along pilot hole and make keep the temperature piston be opened or closed drainage hole, set on drain pipe
There is the position limiting structure for limiting guide rod position.
3. garbage degradation experimental provision according to claim 2, it is characterised in that: the drain pipe upper end be equipped with it is upper it is small under
Big stepped hole is equipped with the transition conical surface, the aperture of drainage hole and the aperture phase of stepped hole small end between stepped hole small end and big end
Deng.
4. garbage degradation experimental provision according to claim 2, it is characterised in that: the position limiting structure includes being located at guiding
Rack gear on the two sidewalls of hole, guide rod are equipped with the teeth matched with rack gear.
5. garbage degradation experimental provision according to claim 2, it is characterised in that: the heat preservation piston is by thermal insulation foaming material
Material is made.
6. garbage degradation experimental provision according to claim 1, it is characterised in that: the goose warm up rock layers and lower insulating layer it
Between be equipped with lower geotechnological strainer grid.
7. garbage degradation experimental provision according to claim 1, it is characterised in that: in upper insulating layer on the test chamber
Upper temperature sensor, middle temperature sensor and lower temperature are from top to bottom successively arranged in section between upper geotechnological strainer grid
Sensor.
8. garbage degradation experimental provision according to claim 1, it is characterised in that: the inclined-plane of the thermal insulation layer upper surface
The gradient is greater than or equal to 3 °.
9. garbage degradation experimental provision according to claim 8, it is characterised in that: the inclined-plane of the thermal insulation layer upper surface
The gradient is 5 °.
10. garbage degradation experimental provision according to claim 1, it is characterised in that: the test chamber and top cover screw thread
It is tightly connected.
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CN201910568157.7A CN110448953A (en) | 2019-06-27 | 2019-06-27 | A kind of garbage degradation experimental provision |
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