CN211367551U - System for realizing biogas residue drying heat balance by cooperatively digesting kitchen waste, kitchen waste and municipal sludge - Google Patents
System for realizing biogas residue drying heat balance by cooperatively digesting kitchen waste, kitchen waste and municipal sludge Download PDFInfo
- Publication number
- CN211367551U CN211367551U CN201921690529.5U CN201921690529U CN211367551U CN 211367551 U CN211367551 U CN 211367551U CN 201921690529 U CN201921690529 U CN 201921690529U CN 211367551 U CN211367551 U CN 211367551U
- Authority
- CN
- China
- Prior art keywords
- outlet
- inlet
- kitchen waste
- biogas
- kitchen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The utility model discloses a kitchen garbage, kitchen garbage and municipal sludge are digestion in coordination and are realized natural pond sediment mummification heat balance's system, include: the kitchen waste pretreatment device comprises a kitchen waste pretreatment device, a homogenizing and blending device, an anaerobic digestion device, a methane purification device, a combustion boiler, a dehydration device and a drying device, wherein the kitchen waste pretreatment device comprises a kitchen waste inlet, a kitchen waste slurry outlet and a grease outlet; the kitchen waste pretreatment device is provided with a kitchen waste inlet and a kitchen waste slurry outlet; the homogenizing and blending device is provided with a kitchen waste slurry inlet, a sludge inlet and a mixed slurry outlet; the anaerobic digestion device is provided with a mixed slurry inlet, a methane outlet and a methane residue outlet; the biogas purification device is provided with a biogas inlet and a purified biogas outlet; the combustion boiler is provided with a purified methane inlet and a superheated steam outlet; the dehydration device is provided with a biogas residue inlet and a dehydrated residue outlet; the drying device is provided with a dehydrated slag inlet, a superheated steam inlet and a dried slag outlet.
Description
Technical Field
The utility model belongs to the technical field of waste resource utilization, concretely relates to kitchen garbage, surplus rubbish in kitchen and municipal sludge are digestion in coordination and are realized natural pond sediment mummification heat balance's system.
Background
The kitchen garbage is wet garbage in urban garbage classification, accounts for 50% -60% of the urban garbage production amount, and is mainly a mixture of unprocessed food such as fruit peels, vegetables, fish, meat, bones and the like. The kitchen waste is food processing leftovers (kitchen waste) and edible residues (swill) generated in the catering industry such as schools, canteens, restaurants and the like, has very complex components, and is mainly a mixture of oil, water, pericarp, vegetables, rice flour, fish, meat, bone, waste tableware, plastics, paper towels and other substances.
The kitchen waste and the kitchen waste have obvious duality, harmfulness and resource. The harm performance is mainly as follows: the kitchen waste contains various animal meats, and if the kitchen waste is used as feed, foot-and-mouth disease and various diseases are easily caused by eating with the same kind, so that the food waste is spread to human and causes harm; the high water content of the landfill is easy to generate a large amount of percolate to pollute the underground water; when the fertilizer is used, odor overflows in the production process, and the surrounding environment is affected. The resource performance mainly includes: according to measurement and calculation of relevant experts, the kitchen waste contains a large amount of nutrient substances, the main components are grease and protein, and the kitchen waste can be processed into high-energy protein high-quality feed instead of corn, fish meal, soybean meal and the like and is also a suitable raw material for preparing biodiesel; calculated according to the dry matter content, 5000 ten thousand tons of kitchen waste is equivalent to 500 ten thousand tons of high-quality feed, the contained energy is equivalent to the energy output of 1000 ten thousand acres of cultivated land per year, and the contained protein is equivalent to the protein output of 2000 ten thousand acres of soybean per year.
With the increasing importance of the state on the garbage treatment and the proposition of 'non-waste cities', the classification work of the urban garbage is continuously promoted, and the supervision on the garbage treatment and disposal is increasingly strict, so that a more effective, safe and reliable process technology capable of centralized treatment is required to treat the wastes, and the urban environment and the food safety are ensured.
The sludge from urban sewage treatment plants contains relatively low organic matter, and the amount of biogas produced in the anaerobic digestion process is small, and the amount of biogas residues produced is high. Meanwhile, the heat required by sludge heat drying is large, and the heat drying operation is difficult to maintain only by the methane produced by the sludge heat drying equipment. If an external heat source is added, the sludge treatment cost is greatly increased. According to statistics, the heat energy cost of the sludge heat drying accounts for more than 60% of the sludge treatment cost.
Therefore, the existing technologies for treating kitchen waste, kitchen waste and sludge need to be further improved.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a kitchen garbage, kitchen garbage and municipal sludge are digestion in coordination and are realized natural pond sediment mummification heat balance's system, adopt this system can realize kitchen garbage, the cooperative digestion of kitchen garbage and mud handles, the marsh gas output has been improved, the heat demand of natural pond sediment mummification has been satisfied, the self-balancing of system energy has been realized, not only the difficult problem that the independent processing mud heat is not enough has been solved, and the stabilization of kitchen garbage and kitchen garbage, innoxious and resourceful treatment have been realized, environmental benefit and economic benefits are high, extensive spreading value has.
In one aspect of the utility model, the utility model provides a kitchen garbage, surplus rubbish in kitchen and municipal sludge digest in coordination and realize natural pond sediment mummification heat balance's system. According to the utility model discloses an embodiment, the system includes:
the kitchen waste pretreatment device is provided with a kitchen waste inlet, a kitchen waste slurry outlet and an oil outlet;
a kitchen waste pretreatment device having a kitchen waste inlet and a kitchen waste slurry outlet;
the kitchen waste mixing device comprises a kitchen waste slurry inlet, a sludge inlet and a mixed slurry outlet, wherein the kitchen waste slurry inlet is connected with the kitchen waste outlet, and the kitchen waste slurry inlet is connected with the kitchen waste slurry outlet;
the anaerobic digestion device is provided with a mixed slurry inlet, a methane outlet and a methane residue outlet, and the mixed slurry inlet is connected with the mixed slurry outlet;
the biogas purification device is provided with a biogas inlet and a purified biogas outlet, and the biogas inlet is connected with the biogas outlet;
the combustion boiler is provided with a condensed water inlet, a purified methane inlet, a combustion flue gas outlet and a superheated steam outlet, and the purified methane inlet is connected with the purified methane outlet;
the dehydration device is provided with a biogas residue inlet, a dehydrated residue outlet and a dehydrated water outlet, and the biogas residue inlet is connected with the biogas residue inlet;
the drying device is provided with a dehydrated slag inlet, a superheated steam inlet, a dried slag outlet, a dried steam outlet and a condensed water outlet, wherein the dehydrated slag inlet is connected with the dehydrated slag outlet, the superheated steam inlet is connected with the superheated steam outlet, and the condensed water outlet is connected with the condensed water inlet.
According to the kitchen waste, kitchen waste slurry obtained after kitchen waste pretreatment and sludge are supplied to the homogenizing and blending device to be mixed and blended to obtain mixed slurry, then the mixed slurry is supplied to the anaerobic digestion device to generate anaerobic digestion reaction to generate methane and biogas residues, the obtained biogas residues are dehydrated and then supplied to the drying device, the obtained biogas is supplied to the purifying device to remove sulfides and then is supplied to the combustion boiler to be combusted to obtain superheated steam and combustion flue gas, because the methane is purified, the combustion flue gas can be directly discharged, the generated superheated steam is supplied to the heating source for use in the drying device, compared with the independent treatment of less sludge and large sludge, and the drying process needs external heat compensation, the biogas output of the anaerobic digestion treatment process of the kitchen waste, the kitchen garbage and the sludge is large, so that the requirement of the subsequent drying treatment process can be met. Therefore, by adopting the system, the cooperative digestion treatment of the kitchen waste, the kitchen waste and the sludge can be realized, the methane yield is improved, the heat requirement of methane residue drying is met, the self-balance of system energy is realized, the problem of insufficient heat of the sludge treated independently is solved, the stabilization, the harmlessness and the resource treatment of the kitchen waste and the kitchen waste are realized, the environmental benefit and the economic benefit are high, and the wide popularization value is realized.
In addition, according to the utility model discloses kitchen garbage, kitchen garbage and municipal sludge are digestion in coordination and are realized natural pond sediment mummification heat balance's system can also have following additional technical characterstic:
preferably, the system further comprises: the waste heat recovery device is provided with a cold water inlet, a drying steam inlet and a heat exchange steam outlet, the drying steam inlet is connected with the drying steam outlet, and the heat exchange steam outlet is connected with at least one of the kitchen pretreatment device, the homogenizing and blending device and the anaerobic digestion device. Therefore, the system heat is fully utilized.
Preferably, the system further comprises: the water treatment device is provided with a removal water inlet and a standard water outlet, the removal water inlet is connected with the removal water outlet, and the standard water outlet is connected with the homogenizing and blending device.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a system for realizing biogas residue drying heat balance by the cooperative digestion of kitchen waste, kitchen waste and municipal sludge according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a system for realizing biogas residue drying heat balance by the cooperative digestion of kitchen waste, kitchen waste and municipal sludge according to yet another embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for realizing the drying heat balance of biogas residues by the cooperative digestion of kitchen waste, kitchen waste and municipal sludge according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for realizing the drying heat balance of the biogas residue by the cooperative digestion of the kitchen waste, the kitchen waste and the municipal sludge according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The technical solution of the present application is completed by the inventors of the present application based on the following findings: the main treatment technology of the current kitchen waste and kitchen waste comprises the following steps: producing feed, aerobic composting, anaerobic digestion and preparing biodiesel. Wherein, the production of feed and aerobic compost is limited by national policy and environmental protection, and can not be a way for large-scale treatment of kitchen waste; the animal and vegetable oil in the kitchen waste is extracted, and the prepared biodiesel can be used for pretreatment of the kitchen waste and cannot be used as a treatment process technology for harmlessness, reduction and recycling of the kitchen waste. Therefore, only anaerobic digestion is the mainstream technology for treating kitchen waste at present and in the future. Anaerobic digestion is a process of decomposing large-molecular organic matter into small-molecular organic matter and inorganic matter by utilizing the self-metabolism of microorganisms under the anaerobic condition. The anaerobic system is totally closed without peculiar smell, and the kitchen waste contains a large amount of organic matters, so that a large amount of methane can be generated, and the amount of methane residues after anaerobic treatment is low. The sludge from urban sewage treatment plants contains relatively low organic matter, and the amount of biogas produced in the anaerobic digestion process is small, and the amount of biogas residues produced is high. Meanwhile, the heat required by sludge heat drying is large, and the heat drying operation is difficult to maintain only by the methane produced by the sludge heat drying equipment. If an external heat source is added, the sludge treatment cost is greatly increased. According to statistics, the heat energy cost of the sludge heat drying accounts for more than 60% of the sludge treatment cost. The inventor of this application aims at solving the defect among the prior art through actively exploring kitchen garbage, kitchen garbage and mud advantage to realize the coprocessing of kitchen garbage, kitchen garbage and mud.
Therefore, in one aspect of the utility model, the utility model provides a kitchen garbage, surplus rubbish in kitchen and municipal sludge digestion realize natural pond sediment mummification heat balance's system in coordination. According to an embodiment of the present invention, referring to fig. 1, the system includes: the kitchen waste treatment device comprises a kitchen waste pretreatment device 100, a kitchen waste pretreatment device 200, a homogenizing and blending device 300, an anaerobic digestion device 400, a methane purification device 500, a combustion boiler 600, a dehydration device 700 and a drying device 800.
According to the utility model discloses an embodiment, kitchen garbage preprocessing device 100 has kitchen garbage entry 101, kitchen garbage thick liquids export 102 and grease export 103, and is suitable for and carries out the preliminary treatment to kitchen garbage to obtain kitchen garbage thick liquids and grease. Specifically, the kitchen waste is food processing leftovers (kitchen waste) and edible residues (swill) generated in food and beverage industries such as schools, canteens, restaurants and the like, the components of the kitchen waste are very complex, the kitchen waste is mainly a mixture of oil, water, peel, vegetables, rice flour, fish, meat, bones, waste tableware, plastics, paper towels and other substances, and the kitchen waste slurry is pretreated by the steps of sorting, impurity removal, oil extraction, pulping and the like, so that the obtained kitchen waste slurry meets the requirement of anaerobic digestion. It should be noted that the processes of sorting, removing impurities, extracting oil, pulping and the like of the kitchen waste are conventional operations in the field, and those skilled in the art can select the processes according to actual needs, and the details are not described here.
According to the embodiment of the utility model, kitchen garbage preprocessing device 200 has kitchen garbage entry 201 and kitchen garbage slurry outlet 202, and is suitable for carrying out the preliminary treatment to kitchen garbage to obtain kitchen garbage slurry. Specifically, the kitchen waste is mainly a mixture of raw food such as fruit peels, vegetables, fish, meat, bones and the like, and the pretreatment comprises the processes of sorting, impurity removal, pulping and the like, so that the obtained kitchen waste slurry meets the requirement of anaerobic digestion. It should be noted that the processes of sorting, removing impurities, pulping and the like of the kitchen waste are conventional operations in the field, and those skilled in the art can select the processes according to actual needs, and the details are not described here.
According to the embodiment of the utility model, homogeneity blending device 300 has kitchen garbage thick liquids entry 301, kitchen garbage thick liquids entry 302, mud entry 303 and mixed thick liquids export 304, and kitchen garbage thick liquids entry 301 links to each other with kitchen garbage export 102, and kitchen garbage thick liquids entry 302 links to each other with kitchen garbage thick liquids export 202, and is suitable for mixing the thick liquid together with the kitchen garbage thick liquids that the aforesaid obtained, kitchen garbage thick liquids and mud to obtain mixed thick liquids. Specifically, the sludge is municipal sludge, the water content of the sludge is about 70-90 wt%, the solid content of kitchen waste slurry is (13-20 wt%), and the mass ratio of the sum of the kitchen waste slurry and the kitchen waste slurry to the sludge is not less than 1. So that the heat of the methane combustion generated by the subsequent anaerobic digestion meets the drying process after the dehydration of the methane slag. According to the embodiment of the utility model, anaerobic digestion device 400 has mixed thick liquids entry 401, marsh gas export 402 and natural pond sediment export 403, mixes thick liquids entry 401 and links to each other with mixed thick liquids export 304, and is suitable for carrying out anaerobic digestion with the above-mentioned mixed thick liquids that obtains to obtain marsh gas and natural pond sediment. The inventor finds that compared with the defects of less methane amount and large methane residue amount of sludge treated independently and the requirement of external heat supplement in the drying process, the method has the advantages that the methane yield in the anaerobic digestion treatment process of the kitchen waste, the kitchen garbage and the sludge is large, so that the requirement of the subsequent drying treatment process can be met. Specifically, in order to improve the anaerobic digestion reaction efficiency, the temperature in the process is kept at 36-38 ℃.
According to the embodiment of the present invention, the biogas purification apparatus 500 has a biogas inlet 501 and a purified biogas outlet 502, the biogas inlet 501 is connected to the biogas outlet 402, and is adapted to purify the biogas obtained above, so as to obtain purified biogas. It should be noted that the purification process is a conventional operation in the art, as long as the removal of impurities such as sulfide in the biogas can be satisfied, and details are not described herein.
According to the utility model discloses an embodiment, combustion boiler 600 has comdenstion water entry 601, purifies marsh gas entry 602, burning exhanst gas outlet 603 and superheated steam export 604, and purification marsh gas entry 602 links to each other with purification marsh gas export 502, and is suitable for to carry out the heat transfer with the comdenstion water with the purification marsh gas burning that the aforesaid obtained to obtain burning flue gas and superheated steam. Specifically, the heat exchange efficiency of the combustion boiler is 90-95%, and combustion flue gas can be directly discharged due to the fact that biogas is purified.
According to the embodiment of the utility model, dewatering device 700 has marsh slag entry 701, behind dehydration sediment export 702 and desorption water export 703, and marsh slag entry 701 links to each other with marsh slag entry 403, and is suitable for the marsh slag that obtains among the above-mentioned anaerobic digestion device to dewater to reduce the moisture content of marsh slag, obtain behind the dehydration sediment and take off the water. Specifically, the dewatering device can be a filter press, a centrifuge, and the like, and can be selected by a person skilled in the art according to actual needs, and the solid content of the dewatered slag is about 20 wt%. Further, in order to improve the dewatering efficiency of the biogas residue, a flocculant, such as polyurethane, polyacrylamide, polysilicic acid, ferric polysilicate sulfate, etc., is added to the dewatering device.
According to the embodiment of the utility model, mummification device 800 has behind the dehydration sediment entry 801, superheated steam entry 802, mummification sediment export 803, mummification steam outlet 804 and comdenstion water export 805, sediment entry 801 links to each other with behind the dehydration sediment export 702 after the dehydration, superheated steam 802 entry links to each other with superheated steam export 604, comdenstion water export 805 links to each other with comdenstion water entry 601, and be suitable for the superheated steam that utilizes above-mentioned combustion boiler to obtain to carry out indirect heating to the sediment after the dehydration, make the moisture evaporation in the sediment after the dehydration be steam, and superheated steam becomes the comdenstion water, and return combustion boiler circulation with this comdenstion water and use, the remaining sediment is the desiccation sediment simultaneously, the solid content of this desiccation sediment is not less than 20%, can burn, carbomorphism or brickmaking etc., realize the innoxiousization. Specifically, the heat efficiency of the drying device is 90-95%.
According to the kitchen waste, kitchen waste slurry obtained after kitchen waste pretreatment and sludge are supplied to the homogenizing and blending device to be mixed and blended to obtain mixed slurry, then the mixed slurry is supplied to the anaerobic digestion device to generate anaerobic digestion reaction to generate methane and biogas residues, the obtained biogas residues are dehydrated and then supplied to the drying device, the obtained biogas is supplied to the purifying device to remove sulfides and then is supplied to the combustion boiler to be combusted to obtain superheated steam and combustion flue gas, because the methane is purified, the combustion flue gas can be directly discharged, the generated superheated steam is supplied to the heating source for use in the drying device, compared with the independent treatment of less sludge and large sludge, and the drying process needs external heat compensation, the biogas output of the anaerobic digestion treatment process of the kitchen waste, the kitchen garbage and the sludge is large, so that the requirement of the subsequent drying treatment process can be met. Therefore, by adopting the system, the cooperative digestion treatment of the kitchen waste, the kitchen waste and the sludge can be realized, the methane yield is improved, the heat requirement of methane residue drying is met, the self-balance of system energy is realized, the problem of insufficient heat of the sludge treated independently is solved, the stabilization, the harmlessness and the resource treatment of the kitchen waste and the kitchen waste are realized, the environmental benefit and the economic benefit are high, and the wide popularization value is realized.
Further, referring to fig. 2, the system for realizing biogas residue drying heat balance by the synergistic digestion of the kitchen waste, the kitchen waste and the municipal sludge further comprises a waste heat recovery device 900 and a water treatment device 1000.
According to the embodiment of the utility model, waste heat recovery device 900 has cold water inlet 901, mummification steam inlet 902 and heat transfer steam outlet 903, and mummification steam inlet 902 links to each other with mummification steam outlet 804, and heat transfer steam outlet 903 links to each other with at least one of meal kitchen preprocessing device 100, homogeneity blending device 300 and anaerobic digestion device 400, and is suitable for carrying out the heat transfer with the mummification steam that the aforesaid obtained and cold water to obtain heat transfer steam. Specifically, the waste heat recovery device can recover heat with the efficiency of 50-80%, and the drying steam obtained in the drying process contains other impurity gases, so that the drying steam cannot be directly used as a heat source, the heat is transferred to the heat exchange steam through indirect heat exchange between the drying steam and cold water, and the heat exchange steam is supplied to at least one of the kitchen pretreatment device, the homogenizing and blending device and the anaerobic digestion device to be used as an indirect heat source. Therefore, the self-sufficiency of the system heat is realized, the operating cost is reduced, the economy of the project is improved, and the financial expenditure is reduced.
According to the utility model discloses an embodiment, water treatment facilities 1000 has desorption water entry 1001 and water outlet 1002 up to standard, and desorption water entry 1001 links to each other with desorption water outlet 703, and water outlet 1002 up to standard links to each other with homogeneity allotment device 300, and is suitable for to carry out purification treatment with the desorption water that above-mentioned dehydration process obtained, obtains water up to standard to supply with this water up to standard to homogeneity allotment process and be used for the slurrying. It should be noted that the purification treatment process is a routine operation in the field, and a person skilled in the art can select the purification treatment process according to actual needs as long as the dehydrated water can reach the emission standard, for example, activated carbon adsorption can be adopted.
Specifically, referring to FIG. 2, the system heat Q1, Q3, Q4, Q5, Q6, Q7, Q8 is in the relationship Q1 > Q3 > Q4 > Q5 > (Q6+ Q7+ Q8); q2 and Q9 are output heat of the system and can be used according to actual conditions.
For convenience of understanding, the method for realizing the heat balance of the drying of the biogas residue by using the system to carry out the synergistic digestion of the kitchen waste, the kitchen waste and the municipal sludge is described in detail below. According to an embodiment of the present invention, referring to fig. 3, the method includes:
s100: pretreating kitchen waste
In the step, the kitchen waste is pretreated so as to obtain kitchen waste slurry and grease. Specifically, the kitchen waste pretreatment comprises the processes of sorting, impurity removal, oil extraction, pulping and the like, so that the obtained kitchen waste slurry meets the anaerobic digestion requirement. Specifically, the kitchen waste is food processing leftovers (kitchen waste) and edible residues (swill) generated in food and beverage industries such as schools, canteens, restaurants and the like, the components of the kitchen waste are very complex, the kitchen waste is mainly a mixture of oil, water, peel, vegetables, rice flour, fish, meat, bones, waste tableware, plastics, paper towels and other substances, and the kitchen waste slurry is pretreated by the steps of sorting, impurity removal, oil extraction, pulping and the like, so that the obtained kitchen waste slurry meets the requirement of anaerobic digestion. It should be noted that the processes of sorting, removing impurities, extracting oil, pulping and the like of the kitchen waste are conventional operations in the field, and those skilled in the art can select the processes according to actual needs, and the details are not described here.
S200: pretreating kitchen garbage
In this step, the kitchen waste is pre-treated to obtain a kitchen waste slurry. Specifically, the kitchen waste is mainly a mixture of raw food such as fruit peels, vegetables, fish, meat, bones and the like, and the pretreatment comprises the processes of sorting, impurity removal, pulping and the like, so that the obtained kitchen waste slurry meets the requirement of anaerobic digestion. It should be noted that the processes of sorting, removing impurities, pulping and the like of the kitchen waste are conventional operations in the field, and those skilled in the art can select the processes according to actual needs, and the details are not described here.
S300: mixing the kitchen waste slurry, the kitchen waste slurry and the sludge for homogenizing and blending
In the step, the obtained kitchen waste slurry, kitchen waste slurry and sludge are mixed together for size mixing so as to obtain mixed slurry. Specifically, the sludge is municipal sludge, the water content of the sludge is about 70 wt% -90 wt%, the solid content of kitchen waste slurry is (13 wt% -20 wt%), and the mass ratio of the sum of the kitchen waste slurry and the kitchen waste slurry to the sludge is not lower than 1, so that the heat generated by combustion of biogas generated by subsequent anaerobic digestion meets the drying process after biogas residue dehydration.
S400: subjecting the mixed slurry to anaerobic digestion
In the step, the obtained mixed slurry is subjected to anaerobic digestion so as to obtain methane and methane slag. The inventor finds that compared with the defects of less methane amount and large methane residue amount of sludge treated independently and the requirement of external heat supplement in the drying process, the method has the advantages that the methane yield in the anaerobic digestion treatment process of the kitchen waste, the kitchen garbage and the sludge is large, so that the requirement of the subsequent drying treatment process can be met. Specifically, in order to improve the anaerobic digestion reaction efficiency, the temperature in the process is kept at 36-38 ℃.
S500: purifying the methane
In this step, the obtained biogas is purified to obtain purified biogas. It should be noted that the purification process is a conventional operation in the art, as long as the removal of impurities such as sulfide in the biogas can be satisfied, and details are not described herein.
S600: the purified methane is combusted and the condensed water is subjected to heat exchange
In the process, the purified methane obtained by the method is combusted and exchanges heat with condensed water so as to obtain combustion flue gas and superheated steam. Specifically, the heat exchange efficiency in the process is 90-95%, and the combustion flue gas can be directly discharged due to the fact that the biogas is purified.
S700: dehydrating the biogas residue
In this step, the biogas residue obtained in the anaerobic digestion process is dehydrated so as to reduce the water content of the biogas residue, obtain dehydrated residue and remove water. Specifically, the dewatering device can be a filter press, a centrifuge, and the like, and can be selected by a person skilled in the art according to actual needs, and the solid content of the dewatered slag is about 20 wt%. Further, in order to improve the dewatering efficiency of the biogas residue, a flocculating agent, such as polyurethane, polyacrylamide, polysilicic acid, ferric polysilicate sulfate and the like, is added in the dewatering process.
S800: drying the dehydrated slag by using superheated steam, and supplying condensed water to step S600
In the step, the superheated steam obtained by the combustion is used for indirectly heating the dehydrated slag, so that the moisture in the dehydrated slag is evaporated into steam, the superheated steam is changed into condensed water, the condensed water is returned to the step S600 for recycling, meanwhile, the residual slag is dry slag, the solid content of the dry slag is not lower than 20 percent, the dry slag can be incinerated, carbonized or bricked, and the like, and the requirements of harmlessness, reduction and recycling of wastes are completely met. Specifically, the thermal efficiency in the drying process is 90-95%.
According to the kitchen waste, kitchen waste slurry obtained after kitchen waste pretreatment and sludge are mixed and subjected to homogeneous blending to obtain mixed slurry, then the mixed slurry is subjected to anaerobic digestion treatment to generate methane and biogas residue, the obtained biogas residue is dehydrated and dried, the obtained methane is subjected to sulfide removal and then is combusted to obtain superheated steam and combustion flue gas, the combustion flue gas can be directly discharged as the methane is dried, the generated superheated steam is used as a heat source in the process, compared with the method for independently treating the sludge with less biogas amount and large biogas residue amount, and the drying process needs external heat compensation, the method integrates the problems that the sludge amount is small and the biogas residue amount is large and the kitchen waste and kitchen waste are independently treated with large biogas amount and small biogas residue amount, the methane yield of the anaerobic digestion treatment process of the kitchen waste, the kitchen waste and the sludge is high, so that the requirement of the subsequent drying treatment process can be met, the investment and the operation cost of independent factory building are reduced, and the occupied area is reduced. Therefore, by adopting the method, the coordinated digestion treatment of the kitchen waste, the kitchen waste and the sludge can be realized, the methane yield is improved, the heat requirement of methane residue drying is met, the self-balance of system energy is realized, the problem of insufficient heat in the independent treatment of the sludge is solved, the stabilization, harmless and resource treatment of the kitchen waste and the kitchen waste are realized, the environmental benefit and the economic benefit are high, and the method has wide popularization value.
Further, referring to fig. 4, the method for realizing biogas residue drying heat balance by the synergistic digestion of the kitchen waste, the kitchen waste and the municipal sludge further includes:
s900: exchanging heat between the drying steam and cold water, and supplying the heat-exchanged steam to at least one of the steps S100, S300 and S400
In the step, the obtained dried steam and cold water are subjected to heat exchange so as to obtain heat exchange steam. Specifically, the waste heat recovery device can recover heat with efficiency of 50-80%, and the drying steam obtained in the drying process contains other impurity gases, so that the drying steam cannot be directly used as a heat source, the heat is transferred to the heat exchange steam through indirect heat exchange between the drying steam and cold water, and the heat exchange steam is supplied to at least one of the steps S100, S300 and S400 to be used as an indirect heat source. Therefore, the self-sufficiency of the system heat is realized, the operating cost is reduced, the economy of the project is improved, and the financial expenditure is reduced.
S1000: purifying the removed water and supplying the water reaching the standard to step S300
In the step, the water obtained by the dehydration process is purified to obtain the water reaching the standard, and the water reaching the standard is supplied to the homogenization and blending process for pulping. It should be noted that the purification treatment process is a routine operation in the field, and a person skilled in the art can select the purification treatment process according to actual needs as long as the dehydrated water can reach the emission standard, for example, activated carbon adsorption can be adopted.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (3)
1. The utility model provides a kitchen garbage, kitchen garbage and municipal sludge are digestion in coordination and are realized system of natural pond sediment mummification heat balance which characterized in that includes:
the kitchen waste pretreatment device is provided with a kitchen waste inlet, a kitchen waste slurry outlet and an oil outlet;
a kitchen waste pretreatment device having a kitchen waste inlet and a kitchen waste slurry outlet;
the kitchen waste mixing device comprises a kitchen waste slurry inlet, a sludge inlet and a mixed slurry outlet, wherein the kitchen waste slurry inlet is connected with the kitchen waste outlet, and the kitchen waste slurry inlet is connected with the kitchen waste slurry outlet;
the anaerobic digestion device is provided with a mixed slurry inlet, a methane outlet and a methane residue outlet, and the mixed slurry inlet is connected with the mixed slurry outlet;
the biogas purification device is provided with a biogas inlet and a purified biogas outlet, and the biogas inlet is connected with the biogas outlet;
the combustion boiler is provided with a condensed water inlet, a purified methane inlet, a combustion flue gas outlet and a superheated steam outlet, and the purified methane inlet is connected with the purified methane outlet;
the dehydration device is provided with a biogas residue inlet, a dehydrated residue outlet and a dehydrated water outlet, and the biogas residue inlet is connected with the biogas residue inlet;
the drying device is provided with a dehydrated slag inlet, a superheated steam inlet, a dried slag outlet, a dried steam outlet and a condensed water outlet, wherein the dehydrated slag inlet is connected with the dehydrated slag outlet, the superheated steam inlet is connected with the superheated steam outlet, and the condensed water outlet is connected with the condensed water inlet.
2. The system of claim 1, further comprising:
the waste heat recovery device is provided with a cold water inlet, a drying steam inlet and a heat exchange steam outlet, the drying steam inlet is connected with the drying steam outlet, and the heat exchange steam outlet is connected with at least one of the kitchen pretreatment device, the homogenizing and blending device and the anaerobic digestion device.
3. The system of claim 1 or 2, further comprising:
the water treatment device is provided with a removal water inlet and a standard water outlet, the removal water inlet is connected with the removal water outlet, and the standard water outlet is connected with the homogenizing and blending device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690529.5U CN211367551U (en) | 2019-10-09 | 2019-10-09 | System for realizing biogas residue drying heat balance by cooperatively digesting kitchen waste, kitchen waste and municipal sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690529.5U CN211367551U (en) | 2019-10-09 | 2019-10-09 | System for realizing biogas residue drying heat balance by cooperatively digesting kitchen waste, kitchen waste and municipal sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211367551U true CN211367551U (en) | 2020-08-28 |
Family
ID=72172111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921690529.5U Active CN211367551U (en) | 2019-10-09 | 2019-10-09 | System for realizing biogas residue drying heat balance by cooperatively digesting kitchen waste, kitchen waste and municipal sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211367551U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684647A (en) * | 2019-10-09 | 2020-01-14 | 安阳艾尔旺新能源环境有限公司 | System and method for realizing biogas residue drying heat balance by virtue of synergistic digestion of kitchen waste, kitchen waste and municipal sludge |
-
2019
- 2019-10-09 CN CN201921690529.5U patent/CN211367551U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684647A (en) * | 2019-10-09 | 2020-01-14 | 安阳艾尔旺新能源环境有限公司 | System and method for realizing biogas residue drying heat balance by virtue of synergistic digestion of kitchen waste, kitchen waste and municipal sludge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110116126B (en) | Kitchen waste and sludge co-processing method | |
| CN110684647A (en) | System and method for realizing biogas residue drying heat balance by virtue of synergistic digestion of kitchen waste, kitchen waste and municipal sludge | |
| CN106746468B (en) | Sludge treatment system and treatment process | |
| CN109226188B (en) | Method for treating kitchen waste by hydrothermal carbonization coupled anaerobic digestion | |
| CN110105095A (en) | A kind of innoxious and recycling processing method of kitchen garbage | |
| CN111036643A (en) | Method for cooperatively treating kitchen waste, household garbage and sludge of sewage plant | |
| CN113182313B (en) | Multi-source organic solid waste disposal system and method for recycling pollutants | |
| CN102371266A (en) | Resource utilization method of kitchen waste | |
| CN111807660A (en) | Resourceful treatment system and method for kitchen waste, straw and municipal sludge | |
| CN102039304B (en) | Electricity generating method of kitchen garbage by means of anaerobic fermentation | |
| CN105347655B (en) | A kind of refuse disposal system, method and its application | |
| CN210419701U (en) | Straw and sludge coprocessing device | |
| CN105921497A (en) | Resourceful comprehensive treatment method and system for household garbage | |
| CN106676138A (en) | Reinforced multi-raw-material two-stage fully-mixed anaerobic digestion methane production method | |
| CN115069739A (en) | Bidirectional reinforced multi-source cooperative full-amount recycling treatment system and technology for kitchen waste | |
| CN114075026A (en) | System and method for treating sludge and organic waste | |
| CN105903749A (en) | Household garbage treatment method and system | |
| CN112191650A (en) | Resourceful treatment system and method for kitchen waste | |
| CN110724547A (en) | Method for drying and pyrolyzing sludge and medicine residues cooperatively | |
| CN211367551U (en) | System for realizing biogas residue drying heat balance by cooperatively digesting kitchen waste, kitchen waste and municipal sludge | |
| CN104418301B (en) | Utilize the method that domestic waste and agricultural wastes prepare hydrogen and nutritional solution | |
| CN211247719U (en) | Processing system for various solid wastes in circulating industrial park | |
| CN113135784A (en) | System and process for aerobic fermentation and resource utilization of fruit and vegetable garbage | |
| CN114075022A (en) | System and method for treating sludge and organic waste by cooperating with pyrolysis of cement kiln | |
| CN104293408A (en) | Recycling method of kitchen waste |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 455000 intersection of Xiange Avenue and Hengshan Avenue, high tech Zone, Anyang City, Henan Province Patentee after: Henan aierwang new energy and environment Co.,Ltd. Address before: 455000 intersection of Xiange Avenue and Hengshan Avenue, high tech Zone, Anyang City, Henan Province Patentee before: Anyang Aierwang New Energy Environmental Co.,Ltd. |