CN100584473C - Distributed energy system for integrated recycling of energy and resources - Google Patents

Abstract

The invention discloses a novel distributed energy system for integrated recycling of energy and resources, belonging to the comprehensive waste treatment technology and the new energy technology scope. It is composed of solar energy and flue gas waste heat composite biogas generating unit, sewage treatment unit and prime mover unit connected to each other. It is an integrated device for recycling and treating kitchen waste, feces and domestic sewage. Then the reclaimed water and raw water of the sewage treatment unit The flue gas output of the engine unit is connected to the reclaimed water heat pump unit; forming a new distributed energy system in which renewable energy and natural gas are complementary, and heat, electricity, clean water and fertilizer are symbiotic. This system is mainly based on renewable energy and complemented with natural gas, which improves the stability of the system, also enhances the stability of energy supply, improves the recycling rate of materials, realizes the efficient cascade utilization of energy, and expands the effective utilization of integrated energy and resources. way. It is suitable for densely populated living areas such as universities, enterprises and institutions, restaurants, and living quarters.

Description

Distributed energy system for integrated recycling of energy and resources

technical field

The invention belongs to the scope of waste comprehensive treatment technology and new energy technology, and in particular relates to a distributed energy system for integrated recycling of energy and resources for cascade utilization of energy.

Background technique

Entering the new century, human beings are facing important challenges of sustainable economic and social development. In recent years, a large number of researches at home and abroad have tried to solve the contradiction between sustainable development, energy shortage and environmental pollution by virtue of the characteristics of high efficiency, environmental protection, economy and high reliability of distributed energy systems, and achieved fruitful progress. Environmental protection, economy, and high reliability are based on the principle of "reduction, reuse, and recycling" and are characterized by low consumption, low emissions, and high efficiency. The core is the efficient use and recycling of resources.

In the Chinese patent "solar biogas device" with the application number of 88100665.3, since the use of solar energy is restricted by time and weather conditions, it is not conducive to the continuous and stable operation of the biogas generating unit. However, this system uses the waste heat of flue gas to complement solar energy, which is very It solves the problem of restricted solar energy utilization.

In the Chinese patent "Reclaimed Water Utilization System" whose application number is 00122060.8, reclaimed water is recycled and reused, but the reclaimed water contains a large amount of energy. The Chinese patent "Water Source Heat Pump Air Conditioner" with application number 01263756.4 mainly uses groundwater. Underground drilling and buried pipes will bring difficulties to the construction. Using the energy in reclaimed water will save costs and maintenance costs, and is more conducive to energy utilization. It will not damage the groundwater system and has considerable environmental benefits. In the Chinese patent "Multifunctional Distributed Cogeneration System of Cooling, Heating and Power" with the application number of 200420001211.9, the end of the system mainly uses lithium bromide absorption air-conditioning units to use the waste heat of the flue gas to supply heat, and the waste heat of the flue gas often cannot meet the needs. Just need supplementary burning to consume fuel.

Contents of the invention

The object of the present invention is to provide a distributed energy system for the integrated recycling of energy and resources in view of the deficiencies of the above-mentioned prior art. It is characterized in that the combined biogas generation unit 1 of solar energy and flue gas waste heat, the sewage treatment unit 2 and the prime mover unit 3 are connected to each other to form an integrated device for recycling and treating kitchen waste, feces and domestic sewage; sewage treatment The reclaimed water output of unit 2 and the flue gas output of the prime mover unit 3 are connected to the reclaimed water heat source unit 4; forming a distributed energy system in which renewable energy and natural gas are complementary, and heat, electricity, clean water and fertilizer are symbiotic.

In the distributed energy system for the integrated recycling of energy and resources, after the kitchen waste is crushed and processed, it enters the solar energy and flue gas waste heat compound biogas generating unit 1 together with the feces for fermentation to produce biogas; the cover on the top of the biogas tank is transparent Or install solar energy collection equipment, and the bottom of the biogas tank is equipped with flue gas waste heat heat exchange equipment; use solar energy to provide the heat required for biogas fermentation during the day, and use the flue gas waste heat of the prime mover unit 3 to adjust the temperature when the heat is insufficient or at night; The residue after biogas fermentation is separated and treated, one part is used as fertilizer, and the other part enters the sewage treatment unit 2 together with the waste water, and domestic sewage enters the sewage treatment unit 2; the waste water becomes reclaimed water after treatment, or becomes reclaimed water after further treatment. into clean water for domestic use; the sludge produced by the sewage treatment unit 2 is divided into two parts for treatment, one part enters the solar energy and flue gas waste heat compound biogas generation unit 1 for biogas fermentation, and the other part is sent to the sludge treatment plant; sewage treatment The power required by unit 2 is also provided by prime mover unit 3; the biogas produced by solar energy and flue gas waste heat composite biogas generating unit 1 enters prime mover unit 3 as the fuel of the prime mover unit after being purified alone or mixed with natural gas; The equipment used in the prime mover unit 3 is a micro-gas turbine or a gas-fired internal combustion engine. The power generated is not only supplied to residents’ daily life, but also to the system’s own equipment. Part of the heat; the reclaimed water heat source unit 4 mainly uses the heat in the reclaimed water generated by the sewage treatment unit 2, or uses part of the waste heat of the flue gas to provide heat for the residents.

The beneficial effects of the present invention are: comprehensively considering waste treatment and step utilization of energy for integration, improving material recycling rate, realizing high-efficiency step utilization of energy, and expanding effective ways for integrated and efficient utilization of energy and resources. This system is suitable for densely populated living areas such as universities, large enterprises and institutions, living quarters, restaurants, etc. The waste in the living area is produced locally and treated locally, reducing transportation; kitchen waste and feces are used as raw materials for biogas generation, so that resources can be recycled. The biogas generation unit uses solar energy and flue gas complementary heating, which improves the stability of the biogas system. The generated biogas is purified and directly supplied to the prime mover to generate electricity. Therefore, this system not only utilizes the waste heat of the flue gas, but also utilizes the energy contained in the reclaimed water, so there is no need for supplementary combustion. Traditional distributed energy systems use natural gas as fuel. This system uses renewable energy as the main source and complements natural gas, which improves system stability and energy stability. Realize the internal energy supply of the system. For example, the electricity/heat required for the operation of the system is provided by the prime mover unit and solar energy, and no external introduction is required. Residential electricity is also provided by the system, which does not need to be connected to the external power grid.

Description of drawings

Fig. 1 is a schematic diagram of the process flow of the distributed energy system of the present invention.

Detailed ways

The invention provides a distributed energy system for integrated recycling of energy and resources. The present invention will be further described below in conjunction with the accompanying drawings.

In the schematic diagram of the process flow of the distributed energy system shown in Figure 1, the combined biogas generating unit 1 of solar energy and flue gas waste heat, the sewage treatment unit 2 and the prime mover unit 3 are connected to each other to form a cycle for kitchen waste, feces and domestic sewage An integrated device for utilization and treatment, and then the water output of the sewage treatment unit 2 and the output of the prime mover unit 3 are connected to the water heat source unit 4; forming a complementary distribution of renewable energy and natural gas, heat, electricity, clean water and fertilizer symbiosis energy system.

The specific cycle process is as follows:

1. Inlet a1 and a2 are set in the composite biogas generating unit 1 of solar energy and flue gas waste heat. Kitchen waste enters the biogas digester through inlet a1 for fermentation after being crushed, and feces enters the biogas digester through inlet a2. The top cover of the biogas digester is set as a transparent body, and the solar energy collection equipment is installed on it. The composite biogas generating unit 1 of solar energy and flue gas waste heat is also provided with a sludge inlet a3, a fertilizer outlet a4, a residue treatment channel a5 and a biogas outlet a7. The sludge from the sewage treatment unit 2 enters the solar energy and flue gas waste heat compound biogas generating unit 1 from the entrance a3 for biogas fermentation, and the residue after fermentation of the solar energy and flue gas waste heat compound biogas generating unit 1 is treated, and the material that can be used as fertilizer passes through the fertilizer outlet a4 is transported out, and the remaining waste water and residue enter the sewage treatment unit 2 through the residue treatment channel a5 for further treatment. There is flue gas heat exchange equipment in the lower part of the biogas digester. The high-temperature flue gas from the prime mover unit 3 enters the solar energy and flue gas waste heat compound biogas generating unit 1 through the flue gas channel a6, and is discharged after the heat exchange is completed. The biogas fermentation temperature can generally be controlled at about 20°C to 40°C, the power required by the composite biogas generating unit 1 of solar energy and flue gas waste heat is provided by the prime mover unit 3, and the biogas is output from the biogas outlet a7.

2. The sewage treatment unit 2 is provided with sludge channels b2 and b4, domestic sewage inlet b1, residue inlet b3, reclaimed water channel b6 and clean water channel b5. The domestic sewage enters the sewage treatment unit 2 through the entrance b1 for treatment, and the generated sludge enters the solar energy and flue gas waste heat composite biogas generation unit 1 through the channel b2 for biogas fermentation, and the residue waste water generated by the solar energy and flue gas waste heat composite biogas generation unit 1 passes through the residue The inlet b3 enters the sewage treatment unit 2 for further treatment. The clean water produced by the sewage treatment unit 2 is supplied to users through b5, and part of the sludge is sent to the sludge treatment plant through the sludge channel b4, and the reclaimed water generated is used through the reclaimed water channel b6. The electricity required for sewage treatment is provided by the prime mover unit 3 .

3. The prime mover unit 3 is equipped with a biogas and natural gas mixing and proportioning device, and the power generation equipment adopts a micro gas turbine or a gas internal combustion engine. The biogas produced by the compound biogas generating unit 1 of solar energy and flue gas waste heat is purified and enters the prime mover unit 3 through the biogas channel c1, and the natural gas can enter the biogas and natural gas mixing and proportioning device through the channel c2. The prime mover unit 3 is provided with flue gas passages c3 and c4. Part of the flue gas generated after the prime mover generates electricity enters the solar energy and flue gas waste heat composite biogas generation unit 1 through the flue gas passage c3 for utilization, and the other part of the flue gas passes through the flue gas passage c4 Enter the reclaimed water heat source unit 4. Generally, the flue gas temperature of a micro gas turbine can reach about 400-600°C, and a gas-fired internal combustion engine can also reach 200-500°C.

4. The reclaimed water heat source unit 4 utilizes the heat in the reclaimed water generated by the sewage treatment unit 2 through the reclaimed water channel d1, and the flue gas enters the reclaimed water heat source unit 4 through the channel d2 for utilization. The entire distributed energy system provides heat and electricity to users.

Claims (1)

1. an energy and resource integrated recycling distributed energy system, it is characterized in that, interconnect by solar energy and the compound biogas generating unit of fume afterheat (1), sewage disposal unit (2) and prime mover unit (3), form rubbish from cooking, ight soil and sanitary sewage are carried out integrated apparatus recycling, that handle; Hydro-thermal source unit (4) during the flue gas output of water output and prime mover unit (3) is connected in the sewage disposal unit (2); Form regenerative resource and natural gas complementary, the distributed energy system of heat, electricity, clean water and fertilizer symbiosis;

In the described energy and resource integrated recycling distributed energy system, rubbish from cooking through after the break process and ight soil enter solar energy and the compound biogas generating unit of fume afterheat (1) together and ferment and produce biogas; Methane-generating pit top cover is transparent or equipment for collecting solar energy is set that the methane-generating pit bottom is provided with the fume afterheat heat-exchange apparatus; Utilize daytime solar energy to provide biogas fermentation required heat, when shortage of heat or night, utilize the fume afterheat of prime mover unit (3) to carry out adjustment; Residue behind the biogas fermentation carries out separating treatment, and a part of as fertilizer sources, another part and waste water enter sewage disposal unit (2) together, enters the sanitary sewage that also has of sewage disposal unit (2); Waste water becomes middle water after treatment, or uses for life through becoming clean water after further handling; The mud that sewage disposal unit (2) produces is divided into two parts to be handled, and wherein a part enters solar energy and the compound biogas generating unit of fume afterheat (1) carries out biogas fermentation, and another part is sent to Treatment of Sludge factory; The needed electric weight in sewage disposal unit (2) is also provided by prime mover unit (3); The biogas that the compound biogas generating unit of solar energy and fume afterheat (1) produces through purification the back separately or and natural gas mix the back and enter prime mover unit (3) as the fuel of prime mover unit; The equipment that described prime mover unit (3) adopts is miniature gas turbine or gas internal-combustion engine, institute's generated energy is not only supplied with resident living and is used, also offer system's equipment of itself, flue gas is that compound biogas generating unit of solar energy and fume afterheat (1) and middle hydro-thermal source unit (4) provide the part heat; In hydro-thermal source unit (4) mainly utilize heat in the middle water that sewage disposal unit (2) produces, or utilize the fume afterheat of part, coming with this is resident's heat supply.

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