Background technology
Along with the raising gradually of quickening of urbanization process and environmental protection requirement, municipal sewage plant's quantity increases day by day.At present, all adopt activated sludge process above 90% municipal sewage treatment in the world, because the excess sludge generation generally is 0.5 ‰ of sewage load~0.8 ‰ (in water ratio 80%); The water ratio of mud is generally at 98.5-99.5%, and water ratio is high, and organic content is high; Character is unstable; It is smelly to be prone to corruption, and contains hazardous and noxious substances such as pathogenic bacteria, parasitic ovum, heavy metal, makes the treatment and disposal of mud become the major issue in the sewage work.The sludge treatment investment accounts for the 20%-50% (some developed country's sludge treatment investments abroad account for the 50%-70% of Sewage Plant gross investment) of Sewage Plant gross investment.Municipal sludge treatment and disposal working cost is high to have become an important factor that limits its development, and the sludge treatment disposal technology of greatly developing cheap low consumption has become the task of top priority.
Abundant organic composition makes the anaerobic digestion of mud become one of important channel of sludge treatment disposal in the mud.Mud classification phase-splitting anaerobic digestion is the process that under the condition of anaerobic, is produced carbonic acid gas and methane by amphimicrobe and obligatory anaerobic bacteria decomposing organic matter.Mud classification phase-splitting anaerobic digestion is because of having the sludge volume of minimizing, stablize sludge quality, producing methane gas; Mud is in digestive process simultaneously; The methanobacteria that produces has very strong anti-microbial effect; Can kill most of pathogenic bacteria and other harmful microorganism, make the mud sanitisation, particularly the thermophilic digestion sterilizing ability increases substantially.Mud classification phase-splitting anaerobic digestion; High-temperature hydrolysis pond temperature of reaction is controlled at 40-50 ℃; Anaeration in normal temperature digester temperature of reaction is controlled at 35-38 ℃; Anaeration in normal temperature digestion (35-38 ℃) with conventional is compared, and needs great amount of heat energy, thereby causes running cost too high and limited application greatly because of it expends the energy.
Summary of the invention
The present invention is in order to solve the bigger problem of the energy that expends that exists in the existing mud classification phase-splitting anaerobic digestion techniques, and then provides a kind of mud classification phase-splitting anaerobic digestion and marsh gas power generation unit residual heat integrative to utilize system.
The objective of the invention is to realize through following technical scheme:
Mud classification phase-splitting anaerobic digestion and marsh gas power generation unit residual heat integrative utilize system; This system comprises preheating pond, heating bath, high-temperature hydrolysis pond, anaeration in normal temperature digester, marsh gas power generation unit, smoke and waste steam boiler, thermal equilibrium water pot, softening water tank equipment, mud mud interchanger, muddy water interchanger and water water-to-water heat exchanger equipment; The cold cycle water coolant of said marsh gas power generation unit reclaims the low-temperature circulating water calorific value by said softening water tank equipment, and preheats for the mud in said preheating pond through said muddy water interchanger said low-temperature circulating water; The high temperature jacket water reclaims the high-temperature water calorific value by said thermal equilibrium water pot; And said high-temperature water heats and be incubated, gives said anaeration in normal temperature digester insulation for said high-temperature hydrolysis pond through said water water-to-water heat exchanger and be said smoke and waste steam boiler supplementary feed; Said smoke and waste steam boiler reclaims said marsh gas power generation unit flue gas calorific value, and the steam of generation is directly given the mud heating of said heating bath; The sludge calorific value of said high-temperature hydrolysis pond to said anaeration in normal temperature digester reclaims through said mud mud interchanger; Reclaim calorific value and preheat for the mud in said preheating pond, the treated laggard biogas generator group of biogas that high-temperature hydrolysis pond, anaeration in normal temperature digester produce.The waste heat of differing temps carries out cascade utilization respectively in the marsh gas power generation process, and the biogas generator generating can directly utilize, and methane power generating system calorific value recovery utilization rate is greater than more than 83%.
The present invention has following beneficial effect: 1) mud classification phase-splitting anaerobic digestion techniques and marsh gas power generation unit residual heat integrative utilization technology are combined; The waste heat of differing temps carries out cascade utilization respectively in the marsh gas power generation process; Reclaim the thermal source of calorific value as classification phase-splitting anaerobic digestion; Energy obtains fully and reasonable use, the new integrated technology that formed sludge treating system electricity, heat, can fully utilize.2) mud mud interchanger.High-temperature hydrolysis pond mud to anaeration in normal temperature digester sludge calorific value reclaims through mud mud interchanger, makes full use of system's calorific value; 3) save energy.The heat energy of mud classification phase-splitting anaerobic digestion is from the waste heat of marsh gas power generation unit, and classification phase-splitting anaerobic digester system produces biogas, and biogas drives power unit, and marsh gas power generation unit waste heat is used for high temperature, the required heat energy of warm anaerobic sludge digestion.Compare energy-conservation mass energy with fuel boiler.4) free from environmental pollution.Use the thermal source of marsh gas power generation unit waste heat, avoided the topsoil of using conventional boiler to cause as sludge high temperature, anaeration in normal temperature digestion.5) thermal source to differing temps carries out cascade utilization respectively, has improved the methane power generating system calorific value and has recycled efficient.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is further specified:
Fig. 1 utilizes and mud classification phase-splitting anaerobic digestion techniques integrated system process flow sheet for marsh gas power generation unit residual heat integrative.This system comprises preheating pond 1, heating bath 2, high-temperature hydrolysis pond 3, anaeration in normal temperature digester 4, marsh gas power generation unit 5, smoke and waste steam boiler 6, thermal equilibrium water pot 7, softening water tank equipment 8, mud mud interchanger, muddy water interchanger and water water-to-water heat exchanger equipment; The cold cycle water coolant of marsh gas power generation unit 5 reclaims the low-temperature circulating water calorific value by softening water tank equipment 8, and preheats for the mud in preheating pond 1 through the muddy water interchanger low-temperature circulating water; The high temperature jacket water reclaims the high-temperature water calorific value by thermal equilibrium water pot 7; And high-temperature water heats and be incubated, gives 4 insulations of anaeration in normal temperature digester for high-temperature hydrolysis pond 3 through the water water-to-water heat exchanger and be smoke and waste steam boiler 6 supplementary feed; Smoke and waste steam boiler 6 reclaims the flue gas calorific value of marsh gas power generation unit 5, and the steam of generation is directly given the mud heating of heating bath 2; The sludge calorific value of high-temperature hydrolysis pond 3 to anaeration in normal temperature digester 4 reclaims through mud mud interchanger; Reclaiming calorific value preheats for the mud in preheating pond 1; The treated laggard biogas generator group 5 of biogas that high-temperature hydrolysis pond 3, anaeration in normal temperature digester 4 produce; The waste heat of differing temps carries out cascade utilization respectively in the marsh gas power generation process, and 5 generatings of marsh gas power generation unit can directly utilize, and methane power generating system calorific value recovery utilization rate is greater than more than 83%.
Fig. 2 utilizes the system works schematic diagram for marsh gas power generation unit residual heat integrative.
The cold cycle water coolant of marsh gas power generation unit 5 mainly cools off the charge air cooler of unit, and leaving water temperature(LWT) is not higher than 55 ℃, through muddy water interchanger recovery waste heat, preheats for the mud in preheating pond 1; The high temperature jacket water of marsh gas power generation unit 5 mainly cools off the parts such as oil cooler, body and cylinder cap of unit; Leaving water temperature(LWT) generally is not higher than 85 ℃; Through water water-to-water heat exchanger recovery waste heat, heat and be incubated for high-temperature hydrolysis pond 3, give the anaeration in normal temperature digester 4 insulations; The fume afterheat of marsh gas power generation unit 5, flue-gas temperature reclaim calorific value through smoke and waste steam boiler 6 about 550 ℃, produce the mud heating that steam is given preheating pond 1.
The present invention can be used for the municipal sewage plant and generates the stable of mud, and the minimizing follow-up for mud provides the basis with recycling treatment, realizes distributing rationally of electricity, heat, ability simultaneously.Can also be used for other sewage works except that municipal wastewater treatment plant.
Embodiment one:
Scale is for being 100, and the municipal sewage plant of 000t/d produces the about 75t/d of mud of water ratio 80%; System's operation in winter; Pretreatment pool moisture percentage in sewage sludge 92%, 15 ℃ of mud mud temperature, sludge high temperature (about 50 ℃) hydrolysis, middle temperature (35 ℃) anaerobic digester system institute heat requirement are 2.554 * 10
5Kcal, high temperature, anaeration in normal temperature Digestive tract produce biogas 3120m3/d, can supply the power unit operation of 300kw, electrogenesis 260kw.Consider marsh gas power generation unit flue gas waste heat recovery utilising efficiency 70%, cold cycle water coolant and high temperature jacket water are recycled efficient 80%, marsh gas power generation unit waste heat recyclable 2.654 * 10
5Kcal; System's operation in summer, pretreatment pool moisture percentage in sewage sludge 92%, 25 ℃ of mud mud temperature, sludge high temperature (about 50 ℃) hydrolysis, middle temperature (35 ℃) anaerobic digester system institute heat requirement are 1.547 * 10
5Kcal, marsh gas power generation unit waste heat recyclable 2.654 * 10
5Kcal; Can find out that by above-mentioned data in summer, the heat that marsh gas power generation unit residual neat recovering system produces can satisfy high temperature far away, anaeration in normal temperature digests needed heat; In winter, the heat that marsh gas power generation unit residual neat recovering system produces can satisfy high temperature basically, anaeration in normal temperature digests needed heat, the taking into account system operation stability, and system can set up a methane boiler.
Existing data shows; Municipal sewage plant's power consumption accounts for total energy consumption 60-90%; Biological sewage treatment electric energy energy consumption (being mainly used in the aeration oxygen supply) accounts for the 50-70% of total power consumption, and the sludge treatment power consumption accounts for the 10-25% of total power consumption, and is visible that the residual heat integrative utilization of marsh gas power generation unit and high temperature, middle temperature anaerobic sludge digestion technology is integrated; Not only can realize sewage work's internal water, heat, can distribute rationally, can realize that more sewage work is significantly energy-saving and cost-reducing.Utilization mud classification phase-splitting anaerobic digestion techniques; Biogas output improves 35% than anaeration in normal temperature digestion, and the biogas that system produces can generate electricity, and accounts for greatly about 35%; Main three parts of generator waste heat: high temperature jacket water, cold cycle water coolant, fume afterheat account for 56% greatly.High temperature jacket water, cold cycle water coolant produce 80 ℃, 50 ℃ hot water through stablizing after the heat exchange of water water-to-water heat exchanger, and fume afterheat can produce steam or hot water through waste heat boiler.Mud classification phase-splitting anaerobic digestion techniques and marsh gas power generation unit residual heat integrative utilize the development of technology, based on sludge stabilizing, the resource utilization of energy-optimised configuration technological possibility are provided for realizing sewage work.
The present invention has the following advantages and the high-lighting effect: 1) mud classification phase-splitting anaerobic digestion techniques and marsh gas power generation unit residual heat integrative utilization technology are combined; The waste heat of differing temps carries out cascade utilization respectively in the marsh gas power generation process; Reclaim the thermal source of calorific value as classification phase-splitting anaerobic digestion; Energy obtains fully and reasonable use, the new integrated technology that formed sludge treating system electricity, heat, can fully utilize.2) mud mud interchanger.High-temperature hydrolysis pond mud to anaeration in normal temperature digester sludge calorific value reclaims through mud mud interchanger, makes full use of system's calorific value; 3) save energy.The heat energy of mud classification phase-splitting anaerobic digestion is from the waste heat of marsh gas power generation unit, and classification phase-splitting anaerobic digester system produces biogas, and biogas drives power unit, and marsh gas power generation unit waste heat is used for high temperature, the required heat energy of warm anaerobic sludge digestion.Compare energy-conservation mass energy with fuel boiler.4) free from environmental pollution.Use the thermal source of marsh gas power generation unit waste heat, avoided the topsoil of using conventional boiler to cause as sludge high temperature, anaeration in normal temperature digestion.5) thermal source to differing temps carries out cascade utilization respectively, has improved the methane power generating system calorific value and has recycled efficient.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.