Self-heating device for biogas digester

Abstract

The utility model discloses a biogas digester self-heating device which comprises a biogas digester, a circulating pump and a water heater, a coiled water pipe immersed below the liquid level of a fluid material is coiled in the biogas digester, and the gas outlet end of the biogas digester is communicated with the gas source end of the water heater through a gas source pipeline. The water heater is used for igniting biogas conveyed by the gas source pipeline and heating a water tank in the water heater, the circulating pump is communicated between the water outlet end of the water tank in the water heater and the water inlet end of the coiled water pipe, and the water outlet end of the coiled water pipe is communicated with the water return end of the water tank in the water heater. And the circulating pump is used for driving a water path between the water tank of the water heater and the coiled water pipe to circularly flow. The utility model has the characteristics of energy consumption saving, easy erection, strong heat transfer capability and the like.

Description

Technical Field

[0001] This utility model relates to biogas digesters, and more particularly to a self-heating device for biogas digesters. Background Technology

[0002] A biogas digester is an energy regeneration device used to ferment livestock manure to produce combustible gas. It is suitable for places such as farms. Existing biogas digesters are generally building structures or prefabricated structures, with prefabricated structures being more common. In some areas with low temperatures, the biogas production efficiency of biogas digesters is relatively low. In this case, it is necessary to add low-energy-consumption temperature rise measures to the biogas digester. For relevant technical means, please refer to the Chinese patent publication document with publication number CN206014902U and title "Heated Biogas Digester", which describes: "A heated biogas digester includes a biogas digester body, an inlet connected to the biogas digester body for feeding, and a feed port connected to the biogas digester body." The biogas digester comprises a water pressure chamber connected to the main body, a sealing cover at the top for discharging, and a heating device for heating the interior of the digester. The heating device includes a heating cylinder, an inlet pipe connected to the top of the heating cylinder and sealed through the top of the digester, and an outlet pipe connected to the bottom of the heating cylinder and sealed through the bottom of the digester. The outer wall of the heating cylinder is equipped with spiral heating fins. This invention's heatable biogas digester, through the spirally arranged heating fins on the heating cylinder, effectively increases the heat dissipation area to improve the heat exchange rate. In winter, when temperatures are low, it ensures a high degree of fermentation in the biogas digester, improves the utilization rate of fermentation raw materials, and increases production efficiency. Although this type of biogas digester has heating capabilities, it relies on an electric heater for heating. In practical applications, this requires complex wiring, considering insulation, durability, wiring distance, and high energy consumption, making it difficult to widely promote in practice. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a biogas digester self-heating device that is energy-saving, easy to install, and has strong heat transfer capacity, in order to address the shortcomings of the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0005] A biogas digester self-heating device includes a biogas digester, a circulating pump, and a hot water heater. A coiled water pipe, submerged below the surface of a fluid material, is wound inside the biogas digester. The gas outlet of the biogas digester is connected to the gas source of the hot water heater via a gas source pipeline. The hot water heater ignites the biogas delivered through the gas source pipeline and heats the water tank within it. The circulating pump connects the water outlet of the water tank in the hot water heater to the water inlet of the coiled water pipe. The water outlet of the coiled water pipe is connected to the water return of the water tank in the hot water heater. The circulating pump drives the water flow between the water tank of the hot water heater and the coiled water pipe to circulate.

[0006] Preferably, it includes a biogas purifier, which is connected in series to the gas source pipeline.

[0007] Preferably, it includes a controller electrically connected to the power supply terminal of the circulating pump and the igniter of the hot water boiler.

[0008] Preferably, it includes a temperature sensor, the sensing end of which is immersed below the surface of the fluid material, and the signal end of which is electrically connected to the controller.

[0009] Preferably, the coiled water pipe is located near the bottom of the biogas digester.

[0010] Preferably, the coiled water pipes cover the bottom of the biogas digester.

[0011] In the self-heating biogas digester device disclosed in this utility model, before the biogas digester is welded and formed, the coiled water pipe is fixed inside the biogas digester, preferably near the bottom. The coiled water pipe should cover the bottom of the biogas digester to ensure that the fluid materials inside the biogas digester are fully heated. This makes the overall equipment easier to install. When the soil temperature is low and the biogas reaction rate is insufficient, the biogas in the biogas digester can be transported to the gas source end of the hot water heater through the gas source pipeline. The hot water heater ignites the biogas transported through the gas source pipeline, which heats the water tank inside the hot water heater and simultaneously starts the heating system. The circulating pump draws hot water from the water tank of the hot water heater and delivers it through a water pipe to the coiled water pipe. Driven by the water flow, the coiled water pipe then delivers the water back to the water tank of the hot water heater, thus achieving water circulation. Based on the above principle, this invention only needs to use the biogas in the biogas digester to achieve self-heating. At the same time, because the circulating pump consumes less electricity, it saves more energy. In addition, this invention utilizes the coiled water pipe to directly contact the fluid materials in the biogas digester, which has strong heat transfer capacity and better meets the application requirements. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the pipeline of the biogas digester self-heating device of this utility model. Detailed Implementation

[0013] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0014] This utility model discloses a self-heating device for biogas digesters. Please refer to [link / reference]. Figure 1It includes a biogas digester 1, a circulating pump 2, and a hot water heater 3. The biogas digester 1 has a coiled water pipe 4 that is submerged below the surface of the fluid material. The gas outlet of the biogas digester 1 is connected to the gas source of the hot water heater 3 through a gas source pipeline 5. The hot water heater 3 is used to ignite the biogas delivered by the gas source pipeline 5 and heat the water tank inside the hot water heater 3. The circulating pump 2 is connected between the water outlet of the water tank inside the hot water heater 3 and the water inlet of the coiled water pipe 4. The water outlet of the coiled water pipe 4 is connected to the water return of the water tank inside the hot water heater 3. The circulating pump 2 is used to drive the water circulation between the water tank of the hot water heater 3 and the coiled water pipe 4.

[0015] In the above structure, the biogas digester 1 is a prefabricated digester installed on-site. It can be welded from fiberglass material. Before the biogas digester 1 is welded, the coiled water pipe 4 is fixed inside the digester 1, preferably near the bottom. The coiled water pipe 4 should cover the bottom of the biogas digester 1 to ensure that the fluid material inside the digester is fully heated, making the overall equipment easier to install. When the soil temperature is low and the biogas reaction rate is insufficient, the biogas in the digester 1 can be transported to the gas source end of the hot water heater 3 through the gas source pipeline 5. The hot water heater 3 ignites the biogas transported through the gas source pipeline 5. At this time, the hot water heater 3 can be... The water tank inside the biogas digester 3 is heated, and the circulating pump 2 is started at the same time. The circulating pump 2 draws hot water from the water tank of the hot water boiler 3 and then transports it to the coiled water pipe 4 through the water pipe. Driven by the water flow, the coiled water pipe 4 then transports the water back to the water tank of the hot water boiler 3, thereby realizing water circulation. Based on the above principle, this utility model can achieve self-heating function by using biogas in the biogas digester 1. At the same time, since the circulating pump 2 consumes less electricity, it saves more energy. In addition, this utility model utilizes the coiled water pipe 4 to directly contact the fluid material in the biogas digester 1, which has strong heat transfer capacity and better meets the application requirements.

[0016] In practical applications, it is not necessary to heat the biogas digester 1 in real time. For example, in summer or in areas with slightly higher temperatures, the biogas digester 1 can generate biogas based on natural temperature. Under these conditions, the above-mentioned circulating water circuit does not need to be started. However, when the ambient temperature drops and the biogas generation efficiency is insufficient, the hot water heater 3 can be ignited and the circulating pump 2 can be started. After the fluid material in the biogas digester 1 is heated, the heating work can be stopped, thereby ensuring low-energy consumption application.

[0017] Furthermore, since biogas digester 1 inevitably contains biogas, it can directly provide a gas source for hot water heater 3. However, at the initial stage of biogas digester installation, due to a lack of biogas, if it is necessary to heat the biogas digester 1, the hot water heater 3 can be connected to a portable gas source, such as a gas cylinder. After the biogas digester 1 has been heated for a certain period of time and has produced sufficient biogas, the biogas gas path can then be connected to the hot water heater 3. Since biogas digesters are generally installed in locations far from living areas, this backup method helps to flexibly heat the hot water heater 3 from a slightly longer distance.

[0018] Based on this, to ensure the cleanliness of the biogas supplied to the hot water boiler 3, this embodiment includes a biogas purifier 6, which is connected in series with the gas source pipeline 5. The biogas purifier 6 improves the biogas combustion efficiency, thereby ensuring the heating efficiency of the hot water boiler 3.

[0019] Similarly, the circulation pump 2 can be powered by a battery or a portable power source. Since the biogas digester 1 does not require long-term heating, a portable power source can flexibly power the circulation pump 2, which is also suitable for power needs at slightly longer distances.

[0020] In practical applications, the circulation pump 2 and the hot water heater 3 need to be started and stopped by a controller. Specifically, this embodiment includes a controller 7, which is electrically connected to the power supply terminal of the circulation pump 2 and the igniter of the hot water heater 3.

[0021] To automatically detect the temperature inside the biogas digester 1, this embodiment includes a temperature sensor 8. The sensing end of the temperature sensor 8 is immersed below the surface of the fluid material, and the signal end of the temperature sensor 8 is electrically connected to the controller 7. The temperature sensor 8 can detect the temperature inside the biogas digester 1, and the controller 7 displays the temperature value. Based on this, the user can determine whether to shut down the circulation pump 2 and the hot water heater 3 to prevent excessive heating inside the biogas digester 1. Of course, based on the temperature data collected by the temperature sensor 8, the controller 7 can automatically shut down the circulation pump 2 and the hot water heater 3 according to a temperature threshold.

[0022] In practical applications, multiple temperature sensors 8 can be installed in the biogas digester 1. The multiple temperature sensors 8 can be distributed in different positions in the biogas digester 1, but it is required that all multiple temperature sensors 8 be submerged below the liquid surface of the fluid material.

[0023] To improve heat exchange capacity, in this embodiment, the coiled water pipe 4 is located near the bottom of the biogas digester 1. Specifically, the coiled water pipe 4 covers the entire bottom of the biogas digester 1.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. All modifications, equivalent substitutions or improvements made within the technical scope of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A self-heating device for biogas digesters, characterized in that, The device includes a biogas digester (1), a circulating pump (2), and a hot water heater (3). The biogas digester (1) has a coiled water pipe (4) that is submerged below the surface of the fluid material. The gas outlet of the biogas digester (1) is connected to the gas source of the hot water heater (3) through a gas source pipeline (5). The hot water heater (3) is used to ignite the biogas delivered by the gas source pipeline (5) and heat the water tank inside the hot water heater (3). The circulating pump (2) is connected between the water outlet of the water tank inside the hot water heater (3) and the water inlet of the coiled water pipe (4). The water outlet of the coiled water pipe (4) is connected to the water return of the water tank inside the hot water heater (3). The circulating pump (2) is used to drive the water circulation between the water tank of the hot water heater (3) and the coiled water pipe (4).

2. The biogas digester self-heating device as described in claim 1, characterized in that, It includes a biogas purifier (6), which is connected in series to the gas source pipeline (5).

3. The biogas digester self-heating device as described in claim 1, characterized in that, It includes a controller (7), which is electrically connected to the power supply terminal of the circulating pump (2) and the igniter of the hot water boiler (3).

4. The biogas digester self-heating device as described in claim 3, characterized in that, It includes a temperature sensor (8), the sensing end of which is immersed below the surface of the fluid material, and the signal end of which is electrically connected to the controller (7).

5. The biogas digester self-heating device as described in claim 1, characterized in that, The coiled water pipe (4) is located near the bottom of the biogas digester (1).

6. The biogas digester self-heating device as described in claim 1, characterized in that, The coiled water pipe (4) covers the bottom of the biogas digester (1).

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