CN201362716Y - Solar energy temperature raising and heat insulation biogas generating pit - Google Patents

Abstract

The utility model discloses a solar energy temperature raising and heat insulation biogas generating pit which comprises a soft biogas generator, a solar thermal collector, a circulating pump, a water inlet pipe, a water outlet pipe and a heat exchange pipe; the biogas generator is installed in a pit body with an opening at the upper end, the bottom and the inner surface of the wall of the pool body are both provided with foam thermal insulation materials or straws of rice and wheat, a dual-layer plastic film tunnel is arranged above the pool body, and the tunnel seals the opening of the pool body. By heating fermentation liquid material in the soft biogas generator by using a solar energy thermal collecting system and a hot water circulating system, the fermentation temperature is raised; simultaneously, the dual-layer plastic film tunnel is constructed above the pool where the soft biogas generator is positioned to sufficiently absorb heat of solar energy, thus forming greenhouse effect, playing the role of thermal insulation, and effectively reducing heat loss.

Description

Solar heating and heat preservation biogas digester

technical field

The utility model relates to a methane pool, in particular to a solar energy temperature-increasing and heat-retaining methane pool.

Background technique

Biogas fermentation is the most widely used form of biomass energy in my country. The development of rural biogas construction can protect the ecological environment, increase farmers' income, and improve the quality of life. The seasons with relatively high gas production rate in biogas fermentation are mainly concentrated in summer and autumn when the temperature is relatively high, which can basically meet the energy consumption requirements of farmers; while in winter, due to the low ambient temperature, the gas production rate of biogas is relatively low, especially in In the southwestern region and the cold northern region where the winter climate is relatively humid, the biogas digester basically does not produce gas or the gas production is not high under such low temperature conditions, which cannot meet the daily energy demand of farmers. Therefore, it is necessary to increase the fermentation temperature of the biogas digester in winter becomes particularly important.

Most of the existing technical measures for increasing temperature and heat preservation of biogas digesters in winter are covered with straw or film, or building solar greenhouses on the biogas digesters, adding thermal raw materials such as cow dung and sheep manure, increasing the concentration of fermented products, etc., and the temperature increasing and heat preservation measures are relatively simple , the technology is extensive and backward, and the effect of warming and heat preservation is not ideal, which cannot meet the requirements of gas production in the normal operation of biogas digesters in winter. However, the research on the cultivation and research of low-temperature fermentation inoculum is relatively slow, and the popularization and application also have certain limitations. Some scholars have also studied the biogas digester's pool structure, building materials and supporting facilities in the courtyard of the biogas digester to enhance the thermal insulation capacity of the biogas digester and prolong the residence time of raw materials in the pond, so as to increase the gas production rate in winter, but these methods only It is limited to the ability to enhance heat preservation, and the effect is not ideal in the case of cold and humid winter weather. In recent years, there have been biogas digesters that use solar energy to heat and increase the temperature of the biogas digester (such as Chinese patent ZL 20082010350.9). This type of biogas digester uses green energy to heat and increase the temperature, and has achieved obvious results. However, the thermal insulation effect is not ideal, resulting in waste of heat.

Utility model content

The utility model aims at the low temperature of the biogas fermentation material liquid, the decrease of the gas production rate, the unstable or even no gas production in the prior art due to the relatively cold and humid winter climate, the low temperature and the lack of effective and applicable heat preservation technical measures in the biogas digester. The problem of not being able to meet the daily gas demand of farmers is to provide a solar heating and heat preservation biogas digester with good heating and heat preservation effects.

In order to solve the above-mentioned problems, the solar energy temperature-increasing and heat-retaining biogas digester of the present utility model includes a soft biogas generator, a solar heat collector, a circulation pump, a water inlet pipe, a water outlet pipe and a heat exchange pipe, and a feed port is provided on the biogas generator. , material outlet and gas outlet, heat exchange tubes are installed at the bottom of the biogas generator, the water inlet of the heat exchange tubes is connected to one end of the water inlet pipe, and the other end of the water inlet pipe passes through the biogas generator and the solar collector The outlet of the hot water storage tank on the top is connected, the water outlet of the heat exchange tube is connected with the inlet of the hot water storage tank through the water outlet pipe, a circulation pump is arranged on the water outlet pipe, and the biogas generator is installed in a In the pool body with an open upper end, foam insulation materials or rice straws are arranged on the bottom of the pool body and the inner surface of the pool wall, and a double-layer plastic film shed is arranged above the pool body, and the shed covers the pool. The opening of the body is closed.

The insulation system is composed of foam insulation materials or rice straw along the bottom and wall of the pool and a double-layer plastic film shed built above the pool body to fully absorb solar heat, form a greenhouse effect, play a role in heat preservation, and effectively reduce heat loss .

In the above technical solution, a feed hole and a slag discharge hole are provided at the lower part of the pool wall of the pool body, the feed hole and the slag discharge hole are respectively opposite to the feed port and the discharge port on the biogas generator, The water inlet pipe and the water outlet pipe pass through the feed hole; a feed room and a discharge room are arranged on the outside of the pool body, and the inner cavity of the feed room is connected to the feed hole and the feed port. The inner cavity of the biogas generator communicates, and the inner cavity of the discharge room communicates with the inner cavity of the biogas generator through the slag discharge hole and the discharge port, and the bottom and upper part of the side wall of the discharge room There are slag outlet and overflow outlet respectively.

In the above technical solution, a control valve is provided on the water outlet pipe. In the cold winter and spring seasons, when the outdoor temperature is low, open the control valve and start the circulation pump, so that the solar hot water stored in the hot water storage tank enters the heat exchange tube at the bottom of the biogas generator through the hot water inlet pipe. , to exchange heat with the fermentation feed liquid in the generator, thereby increasing the fermentation temperature. In the hot season of summer and autumn, or when there is no need to supply heat to the soft biogas generator, close the control valve, stop the operation of the hot water circulation pump, the hot water in the hot water storage tank will no longer enter the biogas digester, and the solar collector and The hot water storage tank forms a solar water heater, which can provide farmers with domestic hot water for bathing.

In the above technical solution, the heat exchange tube is laid in the center of the bottom surface of the biogas generator in a spiral ring shape, so as to fully perform heat exchange.

The beneficial effects of the utility model are: the fermentation material liquid in the soft biogas generator is heated by the solar heat collection system and the hot water circulation system to increase the fermentation temperature; at the same time, a double-layer plastic film arch shed is built above the soft biogas generator placement pool , Fully absorb solar heat, form a greenhouse effect, play a role in heat preservation, and effectively reduce heat loss. The utility model adopts the method of combining the solar energy temperature increase heat exchange device and the construction of the plastic film arch shed, which can make full use of the solar heat to increase the temperature and heat preservation of the soft biogas generator, increase the temperature of the fermentation material liquid, thereby increase the gas production rate, and meet the needs of farmers in winter. Commonly used energy requirements; at the same time, it is convenient to install, manage and maintain.

Below in conjunction with accompanying drawing and embodiment further illustrate the utility model.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The solar heating and heat preservation biogas digester shown in Figure 1 consists of a pond body 13, a soft biogas generator 1, a solar heat collector 2, a circulation pump 4, an inlet pipe 5, an outlet pipe 6, a heat exchange pipe 7, a control valve 8 and a double-layer Composed of plastic film shed 10, wherein the upper end of the pool body 13 is open, the lower part of the pool wall of the pool body 13 is provided with a feed hole 17 and a slag discharge hole 15, and the outside of the pool body 13 is provided with a feed room 11 and a discharge chamber. A slag outlet 16 and an overflow outlet 14 are respectively provided at the bottom and upper part of the side wall of the discharge room 12. The bottom of the pool body 13 and the inner surface of the pool wall are all provided with foam insulation material or rice straw 9, and above the pool body 13 is provided with a double-layer plastic film shed 10, and the shed 10 closes the opening of the pool body. .

Biogas generator 1 is housed in the pond body 13, and this biogas generator 1 is provided with feed inlet, feed outlet and gas outlet 1a, and feed inlet and feed outlet are connected with described feed hole 17 and slag discharge respectively. The hole 15 is butted, and the inner cavity of the biogas generator 1 communicates with the inner cavity of the feeding room 11 and the discharging room 12 through the feeding hole 17 and the slagging hole 15 respectively. A biogas fermentation system is composed of a biogas generator 1, a feed room 11, a discharge room 12, and a gas outlet 1a.

A heat exchange tube 7 is installed at the inner bottom of the biogas generator 1. The heat exchange tube 7 is laid in the center of the bottom surface of the biogas generator 1 in a spiral ring shape. The water inlet of the heat exchange tube 7 is connected with one end of the water inlet pipe 5. The other end of the water pipe 5 passes through the biogas generator 1 and the feed hole 17 is communicated with the outlet of the hot water storage tank 3 on the solar collector 2, and the water outlet of the heat exchange pipe 7 passes through the biogas generator 1 and the inlet. The water outlet pipe 6 of the feed hole 17 communicates with the inlet of the hot water storage tank 3 , and a circulation pump 4 and a control valve 8 are arranged on the water outlet pipe 6 . The fermentation feed liquid in the soft biogas generator is heated by the solar heat collection system and the hot water circulation system to increase the fermentation temperature.

In the cold winter and spring seasons, when the outdoor temperature is low, open the control valve 8 and start the circulation pump 4, so that the hot water stored in the hot water storage tank 3 enters the bottom of the biogas generator 1 through the water inlet pipe 5 The heat exchange tube 7 exchanges heat with the fermentation feed liquid in the generator 1, thereby increasing the fermentation temperature. After the hot water passes through the heat exchange tube 7, the temperature drops, and then through the outlet pipe 6, it is sent to the solar collector by the circulation pump 4, absorbs the solar heat energy, and enters the hot water storage tank 3, so that the cycle continues, making full use of solar energy resources, Increase the fermentation temperature in winter and spring of the soft biogas generator 1, thereby increasing the gas production rate. At the same time, the double-layer plastic film shed can fully absorb solar heat, form a greenhouse effect, play a role in insulating the soft biogas generator, and effectively reduce heat loss. In the hot summer and autumn seasons, or when there is no need to supply heat to the soft biogas generator 1, close the control valve 8, stop the operation of the circulation pump 4, the hot water in the hot water storage tank 3 will no longer enter the biogas generator 1, and the solar collector The heater and the hot water storage tank form a solar water heater, which can provide farmers with domestic hot water for bathing.

Claims (4)

1. solar temperature raising and maintaining methane-generating pit, comprise software biogas generator (1), solar energy collector (2), recycle pump (4), water inlet pipe (5), rising pipe (6) and heat transfer tube (7), on biogas generator (1), be provided with opening for feed, discharge port and air outlet (1a), at this biogas generator (1) inner bottom part heat transfer tube (7) is installed, the water-in of this heat transfer tube (7) links to each other with an end of water inlet pipe (5), the outlet that the other end of this water inlet pipe (5) passes the thermal storage water tank (3) on biogas generator (1) and the solar energy collector (2) is communicated with, the water outlet of this heat transfer tube (7) is communicated with through the inlet of rising pipe (6) with described thermal storage water tank (3), on described rising pipe (6), be provided with recycle pump (4), it is characterized in that: described biogas generator (1) is contained in a upper end open pond body (13), at the bottom of the pond of this pond body (13) and the pool wall internal surface be equipped with cellular insulant or rice wheat straw (9), be provided with double-plastic shed (10) in the top of this pond body (13), by the closure of openings of this shed (10) with the pond body.

2. solar temperature raising and maintaining methane-generating pit according to claim 1, it is characterized in that: be provided with feed port (17) and mud hole (15) in the pool wall bottom of described pond body (13), this feed port (17) and mud hole (15) are relative with opening for feed and discharge port on the described biogas generator (1) respectively, and described water inlet pipe (5) and rising pipe (6) pass from this feed port (17); Be provided with feed space (11) and discharge room (12) in the outside of described pond body (13), the inner chamber of this feed space (11) communicates with the inner chamber of described biogas generator (1) through described feed port (17) and opening for feed, the inner chamber of described discharge room (12) communicates with the inner chamber of described biogas generator (1) through described mud hole (15) and discharge port, is respectively equipped with slag notch (16) and overflow port (14) on the sidewall bottom and the top of this discharge room (12).

3. solar temperature raising and maintaining methane-generating pit according to claim 1 is characterized in that: be provided with by-pass valve control (8) on described rising pipe (6).

4. solar temperature raising and maintaining methane-generating pit according to claim 1 is characterized in that: described heat transfer tube (7) is the be laid in bottom surface central authorities of described biogas generator (1) of ring-type in the shape of a spiral.

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