CN111518682A - Low-pollution livestock and poultry manure anaerobic fermentation device and method - Google Patents

Abstract

The invention provides a low-pollution livestock and poultry manure anaerobic fermentation device and a method, wherein the device comprises a pretreatment device, a pyrolysis treatment tank, a condensation separator, an anaerobic fermentation tank and a biogas collection tank; the method comprises the following steps: s1: crushing and removing impurities from livestock and poultry manure; s2: sending the crushed and impurity-removed livestock and poultry manure to a pyrolysis treatment tank for pyrolysis treatment; s3: steam generated by pyrolysis of the livestock and poultry manure is separated in a condensation separator; s4: and (3) sealing the pyrolyzed livestock and poultry manure in an anaerobic fermentation tank for anaerobic fermentation, separating biogas slurry and biogas residues in the fermentation process, and conveying biogas generated by anaerobic fermentation into a biogas collection tank for storage. In a word, the invention has the advantages of perfect system, advanced method, good processing effect and the like.

Description

Low-pollution livestock and poultry manure anaerobic fermentation device and method

Technical Field

The invention belongs to the technical field of manure treatment, and particularly relates to a low-pollution livestock and poultry manure anaerobic fermentation device and method.

Background

Livestock manure has been used as an important source of soil fertilizer, and is therefore mostly applied on site. Statistics in 1976 show that fertilizers for agricultural production of more than 1/3 in China were provided by animal wastes. The animal excrement contains rich organic matters, nitrogen, phosphorus, potassium and other nutrients, and can supply various mineral substances and trace elements such as calcium, magnesium, sulfur and the like required by crops, so that the requirements of the crops on various nutrients in the growth process are met. Livestock breeding which is too concentrated causes the over-high output of livestock manure in partial areas, the livestock manure cannot be consumed by the traditional fertilization treatment mode, and the large amount of livestock manure is stacked to cause serious pollution to the atmosphere, soil and water environment. On the other hand, due to the rapid development of the fertilizer industry, people use a large amount of fertilizers, so that a large amount of organic manure is left unused, the soil basic nutrients gradually decline in local places, and the livestock manure cannot be returned to the field in time, thereby forming the pollution of the livestock manure to the environment.

In the early traditional animal husbandry production, farmer individual breeding is mainly used, the number of farmer individual livestock breeding heads is small, the produced fecaluria is relatively small, and in the middle of the last 80 th century, on one hand, due to the constraint of natural resources in China, the development of animal product production can only be realized through the reinforced use of resources, the animal husbandry production has the tendency of intensification and centralization, some places encourage large-scale livestock breeding as an important way for adjusting the industrial structure and increasing the income of farmers, and a batch of intensification or industrialized animal husbandry is generated in part of large cities and suburbs. Through the development of more than twenty years, the livestock and poultry breeding scale is larger and larger, the production intensification degree is higher and higher, the livestock and poultry breeding scale is disconnected with the planting industry day by day, the generated livestock and poultry manure is not sufficiently absorbed in the land within a certain space-time range, and the problem of treatment is caused.

However, most of the prior treatment methods for the livestock and poultry manure are anaerobic fermentation treatment, but the anaerobic fermentation treatment process has the condition that oil stains contained in the livestock and poultry manure influence and even inhibit the anaerobic fermentation, and products obtained by simple anaerobic fermentation often need to be further treated, so the invention designs a low-pollution livestock and poultry manure anaerobic fermentation device and method.

Disclosure of Invention

Aiming at the existing problems, the invention provides a low-pollution livestock and poultry manure anaerobic fermentation device and a method.

The technical scheme of the invention is as follows: a low-pollution livestock manure anaerobic fermentation device mainly comprises a pretreatment device, a pyrolysis treatment tank, a condensation separator, an anaerobic fermentation tank and a biogas collection tank,

the pretreatment device comprises a crushing charging barrel, a feeding hopper, a crushing device and a deodorizing device, wherein the crushing charging barrel is formed by hermetically connecting an upper cylindrical barrel and a lower conical barrel, a filtering screen for filtering sundries in the livestock and poultry manure is installed on the plane of the joint of the cylindrical barrel and the conical barrel, the feeding hopper is arranged on one side above the cylindrical barrel, the crushing device is arranged on the central axis of the cylindrical barrel and is used for crushing the livestock and poultry manure in the cylindrical barrel, the deodorizing device is arranged above the cylindrical barrel and is used for pumping away the odor emitted by the livestock and poultry manure in the cylindrical barrel through a gas pump communicated with the interior of the cylindrical barrel, a discharge valve is arranged at the bottom end of the conical barrel,

the pyrolysis treatment tank is communicated with the discharge valve of the pretreatment device through a material pump, the pyrolysis reaction tank comprises a heat conduction pipe arranged on the outer side wall of the pyrolysis treatment tank in a surrounding manner, a heat conduction chamber which is arranged below the pyrolysis treatment tank and communicated with the heat conduction pipe through a liquid pump, a heat conduction agent is arranged in the heat conduction chamber, a combustion chamber used for heating the heat conduction agent in the heat conduction chamber is arranged below the heat conduction chamber, the pyrolysis reaction tank also comprises a stirring rod arranged in the pyrolysis reaction tank, a stirring motor used for providing stirring power for the stirring rod, a pyrolysis exhaust port arranged at the upper end of the pyrolysis reaction tank and a discharge port arranged at the side bottom of the pyrolysis treatment tank,

the condensation separator is connected with a pyrolysis exhaust port of the pyrolysis treatment tank, the condensation separator comprises a horizontal condensation tank body, an air inlet, a condensation baffle, an oil spill plate, a water outlet, an oil discharge port and an exhaust port, the air inlet is arranged at the side end of the condensation tank body and is communicated with the gas pump and the exhaust port, the condensation baffle is arranged on the inner side of the air inlet and is used for preventing the air inlet from introducing gas and cooling the gas, the oil spill plate is arranged at the bottom in the condensation tank body and is used for separating water and oil in condensed liquid, the water outlet is arranged at the bottom of the condensation tank body on the left side of the oil spill plate, the oil discharge port is arranged at the,

the anaerobic fermentation tank comprises a feed inlet which is arranged at the bottom end of the anaerobic fermentation tank and is communicated with a discharge outlet of the pyrolysis treatment tank, an overflow tank which is arranged in the anaerobic fermentation tank in a surrounding manner and is used for separating solid and liquid of the livestock and poultry manure in the anaerobic fermentation tank, an overflow plate is arranged on the inner side of the overflow tank, an overflow hole is arranged on the overflow plate, a liquid discharge port is arranged on the side wall of the anaerobic fermentation tank corresponding to the overflow tank, the anaerobic fermentation tank also comprises a spraying device which is arranged on the inner side wall of the anaerobic fermentation tank below the overflow tank, the spraying device is communicated with a water discharge port of the condensation separator and is used for adjusting the water content of the livestock and poultry manure in the anaerobic fermentation tank,

the biogas collecting tank is respectively communicated with the exhaust port of the condensation separator and the biogas discharge port of the anaerobic fermentation tank and is used for collecting biogas generated by pyrolysis and anaerobic fermentation, and the biogas collecting tank is also communicated with the combustion chamber of the pyrolysis treatment tank and is used for providing combustible biogas for the combustion chamber.

Further, broken motor is including setting up the motor and connecting the drive gear on motor output shaft in broken feed cylinder top, sets up pivot one on broken feed cylinder axis and cup joint the pivot two in pivot one first outside, the upper end of pivot one be equipped with the last fluted disc that drive gear upper portion interlock is connected, the upper end of pivot two be equipped with the lower fluted disc that drive gear lower part interlock is connected, go up fluted disc, lower fluted disc and do the rotation of incorgruous under drive gear's drive to drive pivot one, pivot two do the rotation of incorgruous, be equipped with a plurality of broken chains on pivot one, the pivot both sides wall, and a pivot bottom is equipped with and is used for striking off the scraper blade of beasts and birds excrement and urine on the filter screen, carry out the breakage through turning to opposite broken chain to beasts and birds excrement and urine, crushing effect is.

Furthermore, an oil-gas filter valve is arranged at the exhaust port, so that oil phase filtration is further performed on gas exhausted from the exhaust port, and the influence of the oil phase on the quality of the methane is avoided.

Furthermore, the overflow plate is provided with a concave arc-shaped plate, the filter screen covers the overflow plate, the biogas slurry at the overflow position slides into the overflow groove through the overflow plate, and the filter screen can intercept floating objects in the biogas slurry.

The method for performing the anaerobic fermentation of the livestock and poultry manure by using the fermentation device mainly comprises the following steps:

s1: excrement collecting and pretreating device

The collected livestock and poultry manure is conveyed into a pretreatment device through a feed hopper, the livestock and poultry manure is crushed and subjected to impurity removal through the pretreatment device, and odor emitted by the livestock and poultry manure is extracted through a deodorization device in the crushing and impurity removal processes, so that the odor is prevented from being emitted through the feed hopper;

s2: pyrolysis treatment

The crushed and impurity-removed livestock and poultry manure is conveyed into a pyrolysis treatment tank through a material pump, a heat conducting agent in a heat conducting chamber is heated through a combustion chamber, the heated heat conducting agent is circulated in a heat conducting pipe through a liquid pump, so that the livestock and poultry manure in the pyrolysis treatment tank is pyrolyzed, and the livestock and poultry manure is continuously stirred through a stirring rod in the pyrolyzing treatment process;

s3: oil, gas and water three-phase separation

Steam generated by pyrolysis of livestock and poultry manure is introduced into the condensation separator through the pyrolysis exhaust port, the steam is sprayed on the condensation baffle, oil and water contained in the steam are cooled until liquid slides into the condensation tank body through the condensation baffle, the oil and the water are naturally separated, when the liquid level of the oil and the water rises to the height of the oil spilling plate, the oil phase overflows to the right side of the oil spilling plate, oil-water separation is realized, and the gas phase is conveyed into the methane collection tank through the exhaust port to be stored;

s4: anaerobic fermentation treatment

The method comprises the following steps of conveying the livestock manure pyrolyzed in a pyrolysis treatment tank to the interior of an anaerobic fermentation tank through the bottom of the anaerobic fermentation tank, adjusting the water content of the livestock manure by using a water phase separated in a condensation separator through a spraying device, closing the anaerobic fermentation tank to carry out anaerobic fermentation on the livestock manure, continuing feeding after 2-3d fermentation, separating biogas slurry and biogas residues in the fermentation process, raising the biogas slurry to the height of an overflow groove after the feeding is continued, intercepting floaters on the biogas slurry by using an overflow plate, discharging the biogas slurry through the overflow groove, and conveying the biogas generated by the anaerobic fermentation to a biogas collection tank through a biogas discharge port for storage.

Furthermore, the odor extracted by the deodorization device is sent to a condensation separator for separation treatment, so that the odor is prevented from being emitted in the air to pollute the environment, and meanwhile, the biogas can be separated in the condensation separator.

Preferably, the heat conducting agent is kerosene, the heat conducting efficiency of the kerosene is high, and the livestock and poultry manure in the pyrolysis treatment tank can be quickly heated and pyrolyzed.

Furthermore, the biogas in the biogas collection tank can be used for combustion in a combustion chamber of the pyrolysis treatment tank, so that the treatment cost is reduced.

The invention has the beneficial effects that: the invention provides a low-pollution livestock manure anaerobic fermentation device and a method, wherein the livestock manure is treated by a method combining pyrolysis and anaerobic fermentation, firstly a pretreatment device is arranged to crush and remove impurities from the livestock manure, so that the livestock manure is easily pyrolyzed and sundries influencing thermal combination anaerobic fermentation are removed, then the livestock manure is pyrolyzed by means of heating pyrolysis in a pyrolysis treatment tank, oil, water and gas in the livestock manure are primarily decomposed by pyrolysis, then the oil, the water and the gas are separated by a condensation separator, the inhibition of grease contained in the livestock manure on the anaerobic fermentation can be avoided, the purity of generated biogas is influenced, then the pyrolyzed livestock manure is subjected to anaerobic fermentation by an anaerobic fermentation tank, and the biogas generated by fermentation is collected, and biogas slurry and biogas residues are separated and treated. In a word, the fermentation device is reasonable in structural design, the fermentation method is advanced, and the fermentation effect is good.

Drawings

FIG. 1 is a schematic view of the overall structure of a processing apparatus according to the present invention;

FIG. 2 is a schematic view of the pretreatment apparatus of the present invention;

FIG. 3 is a schematic view of the pyrolysis treatment tank of the present invention;

FIG. 4 is a schematic diagram of a condensate separator of the present invention;

FIG. 5 is a schematic view of the structure of the anaerobic fermenter according to the present invention.

Wherein, 1-pretreatment device, 11-crushing material cylinder, 111-cylinder, 112-cone, 113-filtering screen, 12-feed hopper, 13-crushing device, 131-motor, 132-transmission gear, 133-first rotating shaft, 134-second rotating shaft, 135-upper fluted disc, 136-lower fluted disc, 137-crushing chain, 138-scraper, 14-deodorization device, 141-gas pump, 2-pyrolysis treatment tank, 21-heat pipe, 22-heat conduction chamber, 23-liquid pump, 24-combustion chamber, 25-stirring rod, 26-stirring motor, 27-pyrolysis exhaust port, 28-discharge port, 3-condensation separator, 31-condensation tank, 32-gas inlet, 33-condensation baffle, 34-an oil overflow plate, 35-a water discharge port, 36-an oil discharge port, 37-an exhaust port, 38-an oil-gas filter valve, 4-an anaerobic fermentation tank, 41-a feed port, 42-an overflow groove, 43-an overflow plate, 44-an overflow hole, 45-a liquid discharge port, 46-a spraying device, 47-a methane discharge port, 5-a methane collection tank and 6-a material pump.

Detailed Description

For the understanding of the technical solution of the present invention, the following description is further illustrated with reference to fig. 1 to 5 and specific examples, which are not intended to limit the scope of the present invention.

Example 1: a low-pollution livestock and poultry manure anaerobic fermentation device mainly comprises a pretreatment device 1, a pyrolysis treatment tank 2, a condensation separator 3, an anaerobic fermentation tank 4 and a biogas collection tank 5, as shown in figure 1,

as shown in figure 2, the pretreatment device 1 comprises a crushing cylinder 11, a feed hopper 12, a crushing device 13 and a deodorization device 14, wherein the crushing cylinder 11 is composed of an upper cylindrical barrel 111 and a lower conical barrel 112 which are hermetically connected, a filtering screen 113 for filtering sundries in the livestock and poultry manure is installed on the plane of the joint of the cylindrical barrel 111 and the conical barrel 112, the feed hopper 12 is arranged on one side above the cylindrical barrel 111, the crushing device 13 is arranged on the central axis of the cylindrical barrel 111 and is used for crushing the livestock and poultry manure in the cylindrical barrel 111,

the crushing motor 13 comprises a motor 131 arranged above the crushing cylinder 11 and a transmission gear 132 connected to an output shaft of the motor 131, a first rotating shaft 133 arranged on a central axis of the crushing cylinder 11 and a second rotating shaft 134 sleeved outside the upper half of the first rotating shaft 133, an upper fluted disc 135 meshed with the upper part of the transmission gear 132 is arranged at the upper end of the first rotating shaft 133, a lower fluted disc 136 meshed with the lower part of the transmission gear 132 is arranged at the upper end of the second rotating shaft 134, the upper fluted disc 135 and the lower fluted disc 136 are driven by the transmission gear 132 to rotate in different directions so as to drive the first rotating shaft 133 and the second rotating shaft 134 to rotate in different directions, a plurality of crushing chains 137 are arranged on the side walls of the first rotating shaft 133 and the second rotating shaft 134, and a scraper 138 used for scraping livestock and poultry manure on the,

the deodorizing device 14 is arranged above the cylinder 111, the deodorizing device 14 pumps out the odor emitted by the livestock manure in the cylinder 111 through the air pump 141 communicated with the inside of the cylinder 111, the discharge valve 114 is arranged at the bottom end of the conical barrel 112,

as shown in fig. 3, the pyrolysis treatment tank 2 is communicated with the discharge valve 114 of the pretreatment device 1 through the material pump 6, the pyrolysis reaction tank 2 comprises a heat conduction pipe 21 surrounding the outer side wall of the pyrolysis treatment tank 2, a heat conduction chamber 22 disposed below the pyrolysis treatment tank 2 and communicated with the heat conduction pipe 21 through a liquid pump 23, a heat conduction agent is disposed in the heat conduction chamber 22, a combustion chamber 24 for heating the heat conduction agent in the heat conduction chamber 22 is disposed below the heat conduction chamber 22, the pyrolysis reaction tank 2 further comprises a stirring rod 25 disposed inside the pyrolysis reaction tank 2, a stirring motor 26 for providing stirring power for the stirring rod 25, a pyrolysis exhaust port 27 disposed at the upper end of the pyrolysis reaction tank 2 and a discharge port 28 disposed at the side bottom of the pyrolysis treatment tank 2,

as shown in fig. 4, the condensation separator 3 is connected to the pyrolysis exhaust port 27 of the pyrolysis treatment tank 2, the condensation separator 3 includes a horizontal condensation tank 31, an air inlet 32 disposed at the side end of the condensation tank 31 and communicated with the gas pump 141 and the exhaust port 27, a condensation baffle 33 disposed inside the air inlet 32 for blocking the air inlet 32 from introducing gas and cooling the gas, an oil spill plate 34 disposed at the bottom of the condensation tank 31 for separating water and oil in the condensed liquid, a water outlet 35 disposed at the bottom of the condensation tank 31 at the left side of the oil spill plate 34, an oil outlet 36 disposed at the bottom of the condensation tank 31 at the right side of the oil spill plate 34 and an exhaust port 37 disposed at the top of the condensation tank 31, an oil-gas filter valve 38 is disposed at the exhaust port 37,

as shown in fig. 5, the anaerobic fermentation tank 4 comprises a feed inlet 41 arranged at the bottom end of the anaerobic fermentation tank 4 and communicated with the discharge outlet 28 of the pyrolysis treatment tank 2, an overflow trough 42 arranged around the inside of the anaerobic fermentation tank 4 and used for separating solid and liquid of livestock and poultry manure in the anaerobic fermentation tank 4, an overflow plate 43 arranged at the inner side of the overflow trough 42, an overflow hole 44 arranged on the overflow plate 43, a concave arc plate of the overflow plate 43, a filter screen covered on the overflow plate 43, a liquid discharge outlet 45 arranged on the side wall of the anaerobic fermentation tank 4 corresponding to the overflow trough 42, a spray device 46 arranged on the inner side wall of the anaerobic fermentation tank 4 below the overflow trough 42, the spray device 46 communicated with the water outlet 35 of the condensation separator 3 and used for adjusting the water content of the livestock and poultry manure in the anaerobic fermentation tank 4 by the water phase separated by the condensation separator 3, and a,

the biogas collecting tank 5 is respectively communicated with the exhaust port 37 of the condensation separator 3 and the biogas discharge port 47 of the anaerobic fermentation tank 4 and is used for collecting biogas generated by pyrolysis and anaerobic fermentation, the biogas collecting tank 5 is also communicated with the combustion chamber 24 of the pyrolysis treatment tank 2 and is used for providing combustible biogas for the combustion chamber 24,

the motor 131 can be an YVF2 series variable frequency motor, the gas pump 141 can be a SKV-2BV air pump, the liquid pump 23 can be a TIZ high-temperature-resistant circulating pump, the stirring motor 26 can be a BLD13 stirring motor, the spraying device 46 can be an ABS anti-blocking pressure sprayer, and the material pump 6 can be an NYP220 high-viscosity material pump. .

The working method of the embodiment mainly comprises the following steps:

s1: excrement collecting and pretreating device

The collected livestock and poultry manure is conveyed into a pretreatment device 1 through a feed hopper 12, the livestock and poultry manure is crushed and subjected to impurity removal through the pretreatment device 1, odor emitted by the livestock and poultry manure is extracted through a deodorization device 14 in the crushing and impurity removal processes, the odor is prevented from being dispersed through the feed hopper 12, and the odor extracted by the deodorization device 14 is conveyed into a condensation separator 3 for separation treatment;

s2: pyrolysis treatment

The crushed and impurity-removed livestock and poultry manure is conveyed into the pyrolysis treatment tank 2 through the material pump 6, the heat conducting agent in the heat conducting chamber 22 is heated through the combustion chamber 24, the heat conducting agent is kerosene, the heated heat conducting agent is circulated in the heat conducting pipe 21 through the liquid pump 23, so that the pyrolysis treatment is carried out on the livestock and poultry manure in the pyrolysis treatment tank 2, and the livestock and poultry manure is continuously stirred through the stirring rod 25 in the pyrolysis treatment process;

s3: oil, gas and water three-phase separation

Steam generated by pyrolysis of livestock and poultry manure is introduced into the condensation separator 3 through the pyrolysis exhaust port 27, the steam is sprayed on the condensation baffle 33, oil and water contained in the steam are cooled until liquid slides into the condensation tank body 31 through the condensation baffle 33, the oil and the water are naturally separated, when the oil and the water level rise to the height of the oil overflow plate 34, the oil phase overflows to the right side of the oil overflow plate 34 to realize oil-water separation, and a gas phase is sent into the methane collection tank 5 through the exhaust port 37 to be stored;

s4: anaerobic fermentation treatment

The livestock manure pyrolyzed in the pyrolysis treatment tank 2 is conveyed into the anaerobic fermentation tank 4 through the bottom of the anaerobic fermentation tank 4, the water content of the livestock manure is adjusted by the water phase separated in the condensation separator 3 through a spraying device 46, the anaerobic fermentation tank 4 is closed to carry out anaerobic fermentation on the livestock manure, feeding is continued after 2-3d fermentation, biogas slurry and biogas residues are separated in the fermentation process, the biogas slurry rises to the height of an overflow groove 42 after the feeding is continued, floaters on the biogas slurry are intercepted by an overflow plate 43, the biogas slurry is discharged through the overflow groove 42, the biogas generated by the anaerobic fermentation is conveyed into a biogas collection tank 5 through a biogas discharge port 47 to be stored, and the biogas in the biogas collection tank 5 can be used for combustion in a combustion chamber 24 of the pyrolysis treatment tank 2.

Claims (8)

1. A low-pollution livestock manure anaerobic fermentation device is characterized by mainly comprising a pretreatment device (1), a pyrolysis treatment tank (2), a condensation separator (3), an anaerobic fermentation tank (4) and a biogas collection tank (5),

the pretreatment device (1) comprises a crushing charging barrel (11), a feeding hopper (12), a crushing device (13) and a deodorizing device (14), wherein the crushing charging barrel (11) is formed by hermetically connecting an upper cylindrical barrel (111) and a lower conical barrel (112), a filtering screen (113) for filtering sundries in livestock and poultry manure is installed on the plane of the joint of the cylindrical barrel (111) and the conical barrel (112), the feeding hopper (12) is arranged on one side above the cylindrical barrel (111), the crushing device (13) is arranged on the central axis of the cylindrical barrel (111) and is used for crushing the livestock and poultry manure in the cylindrical barrel (111), the deodorizing device (14) is arranged above the cylindrical barrel (111), the deodorizing device (14) extracts the odor emitted from the livestock and poultry manure in the cylindrical barrel (111) through a gas pump (141) communicated with the interior of the cylindrical barrel (111), and a discharge valve (114) is arranged at the bottom end of the conical barrel (112),

the pyrolysis treatment tank (2) is communicated with a discharge valve (114) of the pretreatment device (1) through a material pump (6), the pyrolysis reaction tank (2) comprises a heat conduction pipe (21) which is arranged on the outer side wall of the pyrolysis treatment tank (2) in a surrounding manner, a heat conduction chamber (22) which is arranged below the pyrolysis treatment tank (2) and is communicated with the heat conduction pipe (21) through a liquid pump (23), a heat conducting agent is arranged in the heat conduction chamber (22), a combustion chamber (24) which is used for heating the heat conducting agent in the heat conduction chamber (22) is arranged below the heat conduction chamber (22), the pyrolysis reaction tank (2) further comprises a stirring rod (25) which is arranged inside the pyrolysis reaction tank (2), a stirring motor (26) which provides stirring power is arranged on the stirring rod (25), a pyrolysis exhaust port (27) which is arranged at the upper end of the pyrolysis reaction tank (2) and a discharge port (28) which is arranged at the side bottom of the pyrolysis treatment tank (2),

the condensation separator (3) is connected with a pyrolysis exhaust port (27) of the pyrolysis treatment tank (2), the condensation separator (3) comprises a horizontal condensation tank body (31), an air inlet (32) which is arranged at the side end of the condensation tank body (31) and is communicated with the gas pump (141) and the exhaust port (27), a condensation baffle (33) which is arranged at the inner side of the air inlet (32) and is used for blocking the air inlet (32) from introducing gas and cooling the gas, an oil overflow plate (34) which is arranged at the bottom in the condensation tank body (31) and is used for separating water and oil in condensed liquid, a water outlet (35) which is arranged at the bottom of the condensation tank body (31) at the left side of the oil overflow plate (34), an oil discharge port (36) which is arranged at the bottom of the condensation tank body (31) at the right side of the oil overflow plate (34) and an exhaust port (37) which is,

the anaerobic fermentation tank (4) comprises a feed inlet (41) which is arranged at the bottom end of the anaerobic fermentation tank (4) and is communicated with a discharge outlet (28) of the pyrolysis treatment tank (2), an overflow trough (42) which is arranged inside the anaerobic fermentation tank (4) and used for separating solid and liquid of the livestock and poultry manure in the anaerobic fermentation tank (4) in a surrounding way, an overflow plate (43) is arranged on the inner side of the overflow trough (42), an overflow hole (44) is arranged on the overflow plate (43), a liquid discharge outlet (45) is arranged on the side wall of the anaerobic fermentation tank (4) corresponding to the overflow trough (42), the anaerobic fermentation tank (4) further comprises a spraying device (46) which is arranged on the inner side wall of the anaerobic fermentation tank (4) below the overflow trough (42), the spraying device (46) is communicated with a water discharge outlet (35) of the condensation separator (3) and is used for adjusting the water content of the livestock and poultry manure in, the top of the anaerobic fermentation tank (4) is also provided with a methane discharge port (47),

the biogas collection tank (5) is respectively communicated with the exhaust port (37) of the condensation separator (3) and a biogas discharge port (47) of the anaerobic fermentation tank (4) and is used for collecting biogas generated by pyrolysis and anaerobic fermentation, and the biogas collection tank (5) is also communicated with the combustion chamber (24) of the pyrolysis treatment tank (2) and is used for providing combustible biogas for the combustion chamber (24).

2. The low-pollution anaerobic fermentation device for livestock and poultry manure as claimed in claim 1, wherein the crushing motor (13) comprises a motor (131) arranged above the crushing cylinder (11), a transmission gear (132) connected to an output shaft of the motor (131), a first rotating shaft (133) arranged on a central axis of the crushing cylinder (11) and a second rotating shaft (134) sleeved outside the upper half part of the first rotating shaft (133), an upper toothed disc (135) meshed with the upper part of the transmission gear (132) is arranged at the upper end of the first rotating shaft (133), a lower toothed disc (136) meshed with the lower part of the transmission gear (132) is arranged at the upper end of the second rotating shaft (134), the upper toothed disc (135) and the lower toothed disc (136) are driven by the transmission gear (132) to rotate in different directions, so as to drive the first rotating shaft (133) and the second rotating shaft (134) to rotate in different directions, the side walls of the first rotating shaft (133) and the second rotating shaft (134) are provided with a plurality of crushing chains (137), and the bottom end of the first rotating shaft (133) is provided with a scraper (138) for scraping livestock and poultry manure on the filter screen (113).

3. The anaerobic fermentation device for livestock and poultry manure with low pollution according to claim 1, characterized in that an oil and gas filter valve (38) is arranged at the exhaust port (37).

4. A method for anaerobic fermentation of livestock and poultry manure by using the fermentation device of any one of claims 1 to 3, which is characterized by mainly comprising the following steps:

s1: excrement collecting and pretreating device

The collected livestock and poultry manure is conveyed into a pretreatment device (1) through a feed hopper (12), the livestock and poultry manure is crushed and subjected to impurity removal through the pretreatment device (1), odor emitted by the livestock and poultry manure is extracted through a deodorization device (14) in the crushing and impurity removal processes, and the odor is prevented from being emitted through the feed hopper (12);

s2: pyrolysis treatment

The crushed and impurity-removed livestock and poultry manure is sent to a pyrolysis treatment tank (2) through a material pump (6), a heat conducting agent in a heat conducting chamber (22) is heated through a combustion chamber (24), the heated heat conducting agent is circulated in a heat conducting pipe (21) through a liquid pump (23), so that the livestock and poultry manure in the pyrolysis treatment tank (2) is pyrolyzed, and the livestock and poultry manure is continuously stirred through a stirring rod (25) in the pyrolyzing treatment process;

s3: oil, gas and water three-phase separation

Steam generated by pyrolysis of livestock and poultry manure is introduced into the condensation separator (3) through the pyrolysis exhaust port (27), the steam is sprayed on the condensation baffle (33), oil and water contained in the steam are cooled until liquid slides into the condensation tank body (31) through the condensation baffle (33), the oil and the water are naturally separated, when the oil and the water level rises to the height of the oil overflow plate (34), the oil phase overflows to the right side of the oil overflow plate (34), oil-water separation is realized, and a gas phase is sent into the methane collection tank (5) through the exhaust port (37) for storage;

s4: anaerobic fermentation treatment

The livestock manure after pyrolysis in the pyrolysis treatment tank (2) is conveyed to the interior of the anaerobic fermentation tank (4) through the bottom of the anaerobic fermentation tank (4), the water content of the livestock manure is adjusted through a water phase separated in the condensation separator (3) by a spraying device (46), the anaerobic fermentation tank (4) is sealed to perform anaerobic fermentation on the livestock manure, feeding is continued after 2-3d of fermentation, biogas slurry and biogas residue are separated in the fermentation process, the biogas slurry rises to the height of an overflow groove (42) after the feeding is continued, a floater on the biogas slurry is intercepted by an overflow plate (43), the biogas slurry is discharged through the overflow groove (42), and biogas generated by anaerobic fermentation is conveyed to a biogas collection tank (5) through a biogas discharge port (47) to be stored.

5. A low-pollution anaerobic fermentation method of livestock and poultry manure as claimed in claim 4, characterized in that the odor gas extracted by said deodorizing means (14) is sent to a condensation separator (3) for separation treatment.

6. The anaerobic fermentation method of livestock and poultry manure with low pollution as claimed in claim 4, wherein the heat conducting agent is kerosene.

7. The anaerobic fermentation method of livestock and poultry manure with low pollution as claimed in claim 4, characterized in that the biogas in the biogas collection tank (5) can be used for combustion in the combustion chamber (24) of the pyrolysis treatment tank (2).

8. A low-pollution anaerobic fermentation method of livestock and poultry manure as claimed in claim 4, characterized in that the odor gas extracted by said deodorizing means (14) is sent to a condensation separator (3) for separation treatment.

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