CN203530318U - Biogas tank integrating heat preservation, heating and stirring - Google Patents

Abstract

The utility model relates to a biogas tank integrating heat preservation, heating and stirring, including a biogas tank body, characterized in that: the side wall of the biogas tank body is provided with an auxiliary gas outlet, and the auxiliary gas outlet is connected with a pipeline through a pipeline pump, the lower end of the pipeline pump is connected to the outlet pipe of the biogas tank body, one end of the outlet pipe leads into the bottom center of the biogas tank, and the other end of the outlet pipe is connected with a valve. Beneficial effects: Compared with the prior art, the biogas tank integrated with heat preservation and heating overcomes the disadvantage of the traditional biogas tank that the gas production is reduced due to the influence of temperature. It is suitable for large-scale farms and northern regions where the outdoor temperature is low in winter, and can make full use of low-grade heat sources in various places. The heat exchange coil in the biogas tank has a large heat exchange area, and intermittent liquid stirring can be used to save a lot of electric energy. The inner wall is made of high-density polyethylene, which has high rigidity, toughness and good mechanical strength, and can withstand the pressure generated by the biogas in the tank.

Description

A biogas tank integrating heat preservation, heating and stirring

technical field

The utility model belongs to a biogas tank, in particular to a biogas tank integrating heat preservation, heating and stirring.

Background technique

Biogas fermentation can be carried out in a relatively wide temperature range, and gas can be produced at 4-65 °C. As the temperature increases, the rate of gas production increases, but not in a linear relationship, as shown in Figure 2. 40-55°C is the transition zone between thermophilic bacteria and mesophilic bacteria, and 50-55°C is the active zone of hyperthermic anaerobic bacteria, with the fastest gas production rate. For example, fermentation at 10°C for 90 days, but its gas production rate is only 59% of that at 30°C for 27 days. Sudden changes in temperature can greatly affect gas production. For large and medium-sized biogas fermentation projects, especially constant temperature projects, temperature is a necessary monitoring indicator. If the temperature change exceeds 5°C, the gas production will decrease significantly, and if the change is too large, the gas production will stop. For example, if a biogas digester normally produces gas at 35°C, if the temperature suddenly drops to 20°C, the gas production will almost stop completely. It can be seen that a suitable and stable fermentation environment is very important to the gas production and gas production rate of biogas.

Traditional household biogas tanks are built by users in the ground according to their needs. The insulation is not good, the management is inconvenient, and the temperature is low in winter, so it is difficult to produce gas, so it is easy to discard. The market has launched a fiberglass biogas tank that is divided into upper and lower hemispheres, which are spliced with bolts. It has the advantages of high strength, acid and alkali resistance, anti-aging, light weight, no leakage, simple construction, and good thermal insulation performance. It is unreasonable, the stirring device is seriously worn and easy to leak, so it cannot be widely used.

With the development of technology, humans began to choose a new type of biogas heating system—solar-assisted heating biogas system. This system utilizes renewable energy—solar energy—to increase the temperature of biogas fermentation in stages, and to a certain extent, increase the gas production and efficiency of biogas. However, there are also some shortcomings in the solar-assisted heating biogas system: this system is seriously affected by the solar energy resources and geographical location of the user's location. In the case of insufficient solar energy resources and severe shading of users' residences, a stable and suitable fermentation temperature cannot be guaranteed, and the problem of low efficiency in the fermentation production period cannot be effectively solved.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the above-mentioned technologies, provide a biogas tank integrating heat preservation, heating and stirring, realize the integration of heat preservation and temperature increase of the tank body, adopt intermittent liquid stirring mode, and form a biogas tank in the tank The eddy current makes the biogas slurry mix evenly; at the same time, it will not affect the biogas production rate due to sudden changes in outdoor temperature, which is conducive to the improvement of biogas fermentation and production.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a biogas tank integrating heat preservation, heating and stirring, including a biogas tank body, characterized in that: the side wall of the biogas tank body is provided with a stirring liquid inlet, The stirring liquid inlet is connected to a pipeline pump through a pipeline, and the lower end of the pipeline pump is connected to the outlet pipeline of the biogas tank body. One end of the outlet pipeline is connected to the bottom center of the biogas tank, and the other end of the outlet pipeline A valve is connected.

The body of the biogas tank is closely attached to its inner layer and a heat exchange coil is arranged along the inner wall of the tank, and the heat exchange coil is connected to the water inlet and the water outlet on the body of the biogas tank through threads.

The inner wall of the biogas tank body is provided with a temperature measuring pole with a thermocouple, and the temperature of the heat exchange hot water is controlled through the reading of the thermocouple on the temperature measuring pole.

The side wall of the biogas tank body is provided with a temperature measuring hole for observing the reading of the thermocouple on the temperature measuring pole.

The biogas tank body includes an inner wall layer of high-density polyethylene, a thermal insulation layer of rigid polyurethane foam and a protective outer layer of glass fiber reinforced plastics which are sequentially connected from inside to outside.

The inner wall layer is made of high-density polyethylene, the insulation layer is made of rigid polyurethane foam, and the outer protective layer is made of glass fiber reinforced plastic.

The top of the biogas tank body is arched, with a detection port and an exhaust port on the top, and a feed port is provided at the bottom of the side wall of the biogas tank body, and the feed port is connected to a feeding funnel through a pipeline.

Beneficial effects: Compared with the prior art, the biogas tank integrating heat preservation, heating and stirring overcomes the disadvantage of the traditional biogas tank that the gas production is reduced due to the influence of temperature. It is suitable for large-scale farms and northern regions where the outdoor temperature is low in winter, and can make full use of low-grade heat sources in various places. The biogas tank is made of fiberglass, rigid polyurethane foam and high-density polyethylene, all of which are relatively common materials. The production process is simple and convenient for mass production, so the price is low. The cost of the biogas tank is low, and the profit of biogas generation is large, except that the investment recovery period is short. The heat exchange coil in the biogas tank has a large heat exchange area, and the intermittent liquid stirring method can be used to form a vortex in the tank, so that the biogas slurry can be mixed evenly. Save a lot of power. Biogas tank materials FRP and high-density polyethylene are compressive materials with low density and small thickness, which are safe and reliable. The inner wall is made of high-density polyethylene, which has high rigidity, toughness and good mechanical strength, and can withstand the pressure generated by the biogas in the tank. The density of the outer wall material FRP is only 1/5 of that of carbon steel, its tensile strength is close to that of carbon steel, and its specific strength can be compared with that of high-grade alloy steel. Its tensile, bending and compressive strength can reach more than 400MP, which has a good protective effect.

Description of drawings

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

Figure 2 is a graph showing the relationship between biogas production and temperature.

In the figure: 1. Biogas tank body, 2. Stirring liquid inlet, 3. Pipeline, 4. Pipeline pump, 5. Outlet pipe, 6. Valve, 7. Heat exchange coil, 8. Water inlet, 9. Water outlet, 10, temperature measurement benchmark, 11, inner wall layer, 12, insulation layer, 13, protective outer layer, 14, pressure measuring port, 15, exhaust port, 16, feeding port, 17, feeding funnel, 18, Pressure gauge, 19, temperature measuring hole, 20, discharge port.

Detailed ways

The specific implementation of the utility model will be described in detail below in conjunction with the preferred embodiments.

Example

The utility model provides a biogas tank which is suitable for large farms and northern regions where the outdoor temperature is low in winter and integrates heat preservation, heating and stirring. A stirring liquid inlet 2 is arranged on the side wall of the biogas tank body 1, so that The stirring liquid inlet is connected to the pipeline pump 4 through the pipeline 3, and the lower end of the pipeline pump is connected to the discharge pipeline 5 of the biogas tank body, and one end of the discharge pipeline 5 is connected to the bottom center of the biogas tank, and the pipeline pump will The liquid flowing to the top is pumped back to the bottom of the biogas tank, and the pumped liquid impacts the unfermented raw materials settled at the bottom, forming a vortex in the tank, so that the biogas slurry is evenly mixed. Pipeline pumps can work intermittently to reduce the power consumed by continuous work. The other end of the discharge port pipeline is connected with a valve 6, which can be opened to discharge the waste through the discharge port 20 when necessary.

The preferred structure of the utility model is that a spiral heat exchange coil 7 is fixed on the biogas tank body close to its inner layer along the inner wall of the tank, and the water inlet 8 and the water outlet 9 on the heat exchange coil and the biogas tank body are threaded Connection, the water inlet and outlet on the body of the biogas tank are connected with the hot water supply mechanism to form a circulating internal heating. Due to the large heat exchange area of the heat exchange coil in the biogas tank, a relatively lower temperature can be used when obtaining the same amount of heat. It can directly use various low-grade heat sources such as solar heat collection, geothermal heat, heating backwater waste heat, etc., to achieve rational utilization of energy. The inner wall of the biogas tank body is equipped with a temperature measuring pole 10 with a thermocouple, and the side wall of the biogas tank body is provided with a temperature measuring hole 19 for observing the readings of the thermocouples on the temperature measuring pole. The temperature of hot water.

The preferred structure of the utility model is that the biogas tank body includes an inner wall layer 11 of high-density polyethylene, a thermal insulation layer 12 of rigid polyurethane foam and a protective outer layer 13 of glass fiber reinforced plastics sequentially connected from inside to outside. The inner wall layer is made of high-density polyethylene (HDPE), which has good wear resistance, electrical insulation, toughness and cold resistance, and good chemical stability. It is insoluble in any organic solvent at room temperature and resistant to acids and alkalis. The corrosion of various salts and other advantages; the insulation layer is made of rigid polyurethane foam material, and the outer layer of protection is made of glass fiber reinforced plastic material. The insulation material is even more porous, so the tank body combined is light. If the low-grade heat source uses solar energy to collect heat, the tank body can be placed on the roof, which not only reduces the heat dissipation of the pipeline, but also prevents the house or trees from blocking the heat collector. At the same time, it is easy to move due to its light weight. The top of the biogas tank body is arched, and a detection port 14 and an exhaust port 15 with a pressure gauge 18 are installed on the top. Funnel 17 is connected.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the structure of the present utility model in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model still belong to the scope of the technical solution of the present utility model.

Claims (7)

1. A biogas tank integrating heat preservation, heating and stirring, including a biogas tank body, characterized in that: the side wall of the biogas tank body is provided with a stirring liquid inlet, and the stirring liquid inlet is connected to a pipeline through a pipeline pump, the lower end of the pipeline pump is connected to the outlet pipe of the biogas tank body, one end of the outlet pipe leads into the bottom center of the biogas tank, and the other end of the outlet pipe is connected with a valve. 2. The biogas tank integrating heat preservation, heating and stirring according to claim 1, characterized in that: the body of the biogas tank is closely attached to its inner layer and a heat exchange coil is arranged along the inner wall of the tank, and the heat exchange plate The water inlet and the water outlet on the pipe and the biogas tank body are connected by threads. 3. The biogas tank integrating heat preservation, heating and stirring according to claim 1 or 2, characterized in that: the inner wall of the biogas tank body is equipped with a temperature measuring pole with a thermocouple, and the The thermocouple reading controls the temperature of the heat exchange hot water. 4. The biogas tank integrating heat preservation, heating and stirring according to claim 3, characterized in that: the side wall of the biogas tank body is provided with a temperature measuring hole for observing the reading of the thermocouple on the temperature measuring pole. 5. The biogas tank integrating heat preservation, heating and stirring according to claim 4, characterized in that: the biogas tank body comprises an inner wall layer of high-density polyethylene, a rigid polyurethane foam The insulation layer and the protective outer layer of fiberglass. 6. The biogas tank integrating heat preservation, heating and stirring according to claim 5, characterized in that: the inner wall layer is made of high-density polyethylene material, and the heat preservation layer is made of rigid polyurethane foam to protect the outer layer Made of fiberglass material. 7. The biogas tank integrating heat preservation, heating and stirring according to claim 6, characterized in that: the top of the biogas tank body is in the shape of a round arch, and the top is provided with a detection port and an exhaust port, and the biogas tank A feed inlet is provided at the bottom of the side wall of the main body, and the feed inlet is connected with a feeding funnel through a pipeline.

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