Biogas power generation waste heat utilization system

Abstract

The utility model discloses a biogas power generation waste heat utilization system which comprises a generator assembly, a generator cylinder sleeve, a waste heat boiler and a heat exchanger. The generator cylinder sleeve is arranged on the periphery of the generator assembly in a sleeving mode and filled with cooling liquid. The waste heat boiler is communicated with the flue gas outlet; and the hot side of the heat exchanger is circularly connected with the generator cylinder sleeve, and the cold side of the heat exchanger is connected with a water inlet pipeline of the waste heat boiler, so that high-temperature water in the generator cylinder sleeve exchanges heat with low-temperature water entering the waste heat boiler. According to the waste heat boiler, the temperature of cylinder sleeve water can be reduced, normal operation of the generator assembly is guaranteed, meanwhile, the temperature of water entering the waste heat boiler is increased, the heat energy utilization rate is increased, and the steam yield of the waste heat boiler is increased.

Description

Technical Field

[0001] This utility model relates to the technical field of biogas power generation equipment, and specifically to a biogas power generation waste heat utilization system. Background Technology

[0002] Currently, biogas combustion power generation is a biogas utilization technology that has emerged with the continuous development of large-scale biogas digester construction and comprehensive biogas utilization. It uses biogas produced by anaerobic fermentation to power an engine to generate electricity and heat. Biogas power generation is characterized by its efficiency, energy saving, safety, and environmental friendliness, and is a widely distributed and inexpensive distributed energy source.

[0003] Patent CN210689U discloses a waste heat recovery system for biogas power generation. It includes an anaerobic treatment device, a biogas generator, a dual-pressure waste heat boiler, a heat exchange unit, and heat exchange pipelines. The system generates high-pressure steam and low-pressure steam by transporting the flue gas produced by biogas combustion to the dual-pressure waste heat boiler. The high-pressure steam is then fed into the anaerobic treatment device, and the low-pressure steam is fed into the heat exchange unit.

[0004] Biogas generators produce a large amount of heat energy when generating electricity. However, the existing technologies mentioned above can only utilize the high-temperature flue gas generated during power generation, resulting in a low utilization rate of the heat energy generated by the biogas generator. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a biogas power generation waste heat utilization system to solve the technical problem that the existing technology can only utilize the high-temperature flue gas generated when the generator generates electricity, resulting in a low utilization rate of the heat energy generated by the biogas generator.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a biogas power generation waste heat utilization system, including:

[0008] The generator assembly is equipped with a flue gas outlet;

[0009] A generator cylinder liner is fitted around the outer periphery of the generator assembly and is filled with coolant.

[0010] Waste heat boiler, wherein the waste heat boiler is connected to the flue gas outlet; and

[0011] A heat exchanger, the hot side of which is circulatedly connected to the generator cylinder liner, and the cold side of which is connected to the inlet water pipe of the waste heat boiler, so that the coolant in the generator cylinder liner can exchange heat with the low-temperature water entering the waste heat boiler.

[0012] In some embodiments, the biogas power generation waste heat utilization system further includes a first water inlet pipe, a water softener, and a water softener tank. One end of the first water inlet pipe is connected to the inlet of the water softener tank. The water softener is located in the first water inlet pipe. The outlet of the water softener tank is connected to the water inlet pipe. The water softener tank is also provided with a circulation inlet and a circulation outlet. The circulation inlet and the circulation outlet are connected to the cold side of the heat exchanger.

[0013] In some embodiments, both the generator assembly and the heat exchanger are provided in multiple forms, and the cold side of each of the multiple heat exchangers is connected to the circulation inlet and the circulation outlet.

[0014] In some embodiments, the biogas power generation waste heat utilization system further includes a biogas boiler, and the outlet of the soft water tank is connected to the biogas boiler.

[0015] In some embodiments, the heat exchanger is a plate heat exchanger.

[0016] In some embodiments, the generator assembly includes a cylinder liner water circulation pipeline, which includes a second inlet pipe, an outlet pipe, a bypass pipe, and a valve assembly. The generator cylinder liner, the outlet pipe, the second inlet pipe, and the heat exchanger are connected in a hot-side circulation connection. The bypass pipe communicates with the second inlet pipe and the outlet pipe, so that the heat exchanger and the bypass pipe are arranged in parallel. The valve assembly is located on a pipe within the cylinder liner water circulation pipeline and is used to regulate the flow rate of the liquid flowing into the bypass pipe and the heat exchanger.

[0017] In some embodiments, the valve assembly is located at the connection between the hot side of the heat exchanger and the second inlet or outlet pipe.

[0018] In some embodiments, the valve assembly includes a three-way valve.

[0019] In some embodiments, the valve assembly includes a valve seat, two valve plates, and a drive member. The valve seat has two channels, one of which is located in the second inlet pipe or outlet pipe, and the other channel connects the hot side of the heat exchanger and the second inlet pipe or outlet pipe. The two valve plates are rotatably mounted in the two channels respectively, and the two valve plates are perpendicular to each other. The drive member is connected to the two valve plates to drive the two valve plates to rotate synchronously.

[0020] In some embodiments, the valve assembly includes a first valve, a second valve, and a third valve, wherein the first valve is disposed on the second inlet pipe, the second valve is disposed on the outlet pipe, and the third valve is disposed on the bypass pipe.

[0021] Compared with the prior art, the biogas power generation waste heat utilization system provided by this utility model has a heat exchanger whose hot side is circulatedly connected to the cylinder liner of the generator, and the cylinder liner water is circulating inside. When the generator assembly is generating electricity, it generates a large amount of heat, causing the cylinder liner water temperature to rise. The cold side of the heat exchanger is connected to the inlet pipe of the waste heat boiler, and the inlet pipe is used to supply room temperature water to the preheating boiler. The waste heat boiler uses the high temperature flue gas generated by the generator assembly to heat the water inside to generate steam. The high temperature cylinder liner water exchanges heat with the room temperature water in the inlet pipe of the waste heat boiler in the heat exchanger, which reduces the temperature of the cylinder liner water and ensures the normal operation of the generator assembly. At the same time, it increases the temperature of the water entering the waste heat boiler, improves the thermal energy utilization rate, and increases the steam output of the waste heat boiler.

[0022] The above description is merely an overview of the technical solution of this utility model. To better understand the technical means of this utility model and to enable its implementation according to the description, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of the biogas power generation waste heat utilization system provided by this utility model;

[0024] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the valve assembly;

[0025] Figure 3 This is a schematic diagram of another embodiment of the biogas power generation waste heat utilization system provided by this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Generator assembly, 11-Flue gas outlet, 12-Second water inlet pipe, 13-Water outlet pipe, 14-Bypass pipe, 15-Valve assembly, 151-Valve seat, 152-Valve plate, 153-Driver, 154-First valve, 155-Second valve, 156-Third valve, 2-Waste heat boiler, 3-Heat exchanger, 4-First water inlet pipe, 5-Water softener, 6-Soft water tank, 7-Biogas boiler. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] To address the technical problem of low thermal energy utilization rate of biogas generators, which can only utilize the high-temperature flue gas generated during power generation, this invention provides a biogas power generation waste heat utilization system. This system can reduce the temperature of the cylinder liner water, ensuring the normal operation of the generator assembly, while simultaneously increasing the temperature of the water entering the waste heat boiler, thereby improving thermal energy utilization and increasing the steam output of the waste heat boiler.

[0030] Please see Figure 1 , Figure 1 This is a schematic diagram of the biogas power generation waste heat utilization system in one embodiment of the present invention.

[0031] This utility model provides a biogas power generation waste heat utilization system, including a generator assembly 1, a generator cylinder liner, a waste heat boiler 2, and a heat exchanger 3. The generator assembly 1 is provided with a flue gas outlet 11. The generator cylinder liner is fitted around the outer periphery of the generator assembly 1 and is filled with coolant. The waste heat boiler 2 is connected to the flue gas outlet 11. The hot side of the heat exchanger 3 is circulatedly connected to the generator cylinder liner, and the cold side of the heat exchanger 3 is connected to the water inlet pipe of the waste heat boiler 2, so that the high-temperature water in the generator cylinder liner can exchange heat with the low-temperature water entering the waste heat boiler 2.

[0032] In this embodiment, the hot side of the heat exchanger 3 is circulatedly connected to the cylinder liner of the generator, and the cylinder liner water is circulating inside it. When the generator assembly 1 is generating electricity, it generates a large amount of heat, causing the temperature of the cylinder liner water to rise. The cold side of the heat exchanger 3 is connected to the inlet pipe of the waste heat boiler 2. The inlet pipe is used to supply room temperature water to the preheating boiler. The waste heat boiler 2 uses the high-temperature flue gas generated by the generator assembly 1 to heat the water inside it to generate steam. The high-temperature cylinder liner water exchanges heat with the room temperature water in the inlet pipe of the waste heat boiler 2 in the heat exchanger 3, which reduces the temperature of the cylinder liner water and ensures the normal operation of the generator assembly 1. At the same time, it increases the temperature of the water entering the waste heat boiler 2, improves the thermal energy utilization rate, and increases the steam output of the waste heat boiler 2.

[0033] In this embodiment, the biogas power generation waste heat utilization system further includes a first water inlet pipe 4, a water softener 5, and a water softener tank 6. One end of the first water inlet pipe 4 is connected to the water inlet of the water softener tank 6. The water softener 5 is located on the first water inlet pipe 4. The water outlet of the water softener tank 6 is connected to the water inlet pipe. The water softener tank 6 is also provided with a circulation inlet and a circulation outlet. The circulation inlet and the circulation outlet are connected to the cold side of the heat exchanger 3.

[0034] Specifically, the water softener 5 can use sodium-type cation exchange resin to remove calcium and magnesium ions in the water, reduce the hardness of the raw water, and achieve the purpose of softening hard water, thereby avoiding the scaling of carbonates in pipes, containers, and boilers. This greatly saves investment costs while ensuring smooth production. Therefore, the water softener 5 is installed on the first inlet pipe 4, and the soft water tank 6 is connected to the cold side of the heat exchanger 3 in a circulating connection, which can continuously exchange heat between the water in the soft water tank 6 and the cylinder jacket water, thereby increasing the temperature of the water in the soft water tank 6. Then, the water in the soft water tank 6 is transported to the waste heat boiler 2. The soft water tank 6 can serve as a temporary storage unit.

[0035] Furthermore, a circulation pump is also provided on the pipe connecting the circulation inlet to the cold side of the heat exchanger 3, and the circulation pump ensures water circulation between the soft water tank 6 and the heat exchanger 3.

[0036] In some embodiments, both the generator assembly 1 and the heat exchanger 3 are provided in multiple forms, and the cold side of each of the multiple heat exchangers 3 is connected to the circulation inlet and the circulation outlet.

[0037] Specifically, in order to improve efficiency, multiple generator assemblies 1 and multiple heat exchangers 3 are provided, with each generator assembly 1 corresponding to one of the multiple heat exchangers 3, so that the cylinder liner water of the multiple generator assemblies 1 can exchange heat with the water in the soft water tank 6, thereby further increasing the water temperature in the soft water tank 6.

[0038] In this embodiment, the biogas power generation waste heat utilization system further includes a biogas boiler 7, and the outlet of the soft water tank 6 is connected to the biogas boiler 7.

[0039] Specifically, by supplying hot water at a higher temperature to the biogas boiler 7 through the soft water tank 6, the energy consumption of the biogas boiler 7 can be reduced.

[0040] In this embodiment, the heat exchanger 3 is a plate heat exchanger 3.

[0041] In this embodiment, the generator assembly 1 includes a cylinder liner water circulation pipeline, which includes a second inlet pipe 12, an outlet pipe 13, a bypass pipe 14, and a valve assembly 15. The generator cylinder liner, the outlet pipe 13, the second inlet pipe 12, and the heat exchanger 3 are connected in a hot-side circulation connection. The bypass pipe 14 is connected to the second inlet pipe 12 and the outlet pipe 13, so that the heat exchanger 3 and the bypass pipe 14 are arranged in parallel. The valve assembly 15 is located on the pipe in the cylinder liner water circulation pipeline and is used to regulate the flow rate of the liquid entering the bypass pipe 14 and the heat exchanger 3. Due to the working principle of the generator assembly 1, the cylinder liner water is cooled in a closed-loop circulation. The temperature of the cylinder liner water is generally maintained between 80℃ and 90℃. By setting the bypass pipe 14 to be connected in parallel with the heat exchanger 3, on the one hand, when the heat exchanger 3 needs maintenance and repair, it can be closed through the valve assembly 15, allowing the cylinder liner water to circulate in the bypass pipe 14. This allows the heat exchanger 3 to be maintained and replaced without shutting down the machine, thus avoiding a reduction in the efficiency of the device. On the other hand, to prevent the cylinder liner water temperature from falling below 80℃ or rising above 90℃, the flow rate of the liquid entering the bypass pipe 14 and the heat exchanger 3 can be adjusted through the valve assembly 15 to ensure the temperature of the cylinder liner water.

[0042] In this embodiment, the valve assembly 15 is located at the connection between the hot side of the heat exchanger 3 and the second inlet pipe 12 or outlet pipe 13.

[0043] In this embodiment, the valve assembly 15 includes a valve seat 151, two valve plates 152, and a drive member 153. The valve seat 151 has two channels, one of which is located in the second inlet pipe 12 or outlet pipe 13, and the other channel connects the hot side of the heat exchanger 3 and the second inlet pipe 12 or outlet pipe 13. The two valve plates 152 are rotatably installed in the two channels respectively, and the two valve plates 152 are perpendicular to each other. The drive member 153 is connected to the two valve plates 152 to drive the two valve plates 152 to rotate synchronously.

[0044] Specifically, the second inlet pipe 12 is divided into a first section and a second section. The channel runs through the valve seat 151 in a front-to-back direction. The two channels are spaced apart in a left-to-right direction. The two channels are the first channel and the second channel, respectively. The two ends of the first section are connected to the first channel and the hot side of the heat exchanger 3, respectively. The two ends of the bypass pipe 14 are connected to the second channel and the outlet pipe 13, respectively. One end of the second section is connected to the first channel and the second channel, and the other end of the second section is connected to the generator cylinder liner. The two valve plates 152 are the first valve plate 152 and the second valve plate 152, respectively. The first valve plate 152 is adapted to the first channel. The first valve plate 152 is rotatably installed in the first channel along the left-to-right upward axis, so that by rotating the first valve plate 152... 52. Adjust the opening of the first channel. The second valve plate 152 is adapted to the second channel. The second channel is rotatably installed in the second channel along the left-right upper axis. Thus, the opening of the second channel is adjusted by rotating the second valve plate 152. The first valve plate 152 and the second valve plate 152 are perpendicular to each other. That is, when the first valve plate 152 is horizontal, the second valve plate 152 is vertical. That is, when the first channel is fully open, the second channel is completely closed. When the second channel is fully open, the first channel is completely closed. The driving member 153 is connected to the first valve plate 152 and the second valve plate 152. Thus, the driving member 153 drives the first valve plate 152 and the second valve plate 152 to rotate synchronously.

[0045] Furthermore, the valve seat 151 is provided with a mounting hole that passes through the two channels; the drive component 153 includes a connecting shaft and a motor, the connecting shaft is rotatably mounted in the mounting hole, the two valve plates 152 are connected to the connecting shaft, and the motor is connected to one end of the connecting shaft.

[0046] In another embodiment, the valve assembly 15 includes a three-way valve.

[0047] In another embodiment, the valve assembly 15 includes a first valve 154, a second valve 155 and a third valve 156, the first valve 154 is disposed on the second inlet pipe 12, the second valve 155 is disposed on the outlet pipe 13, and the third valve 156 is disposed on the bypass pipe 14.

[0048] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail below:

[0049] The hot side of the heat exchanger 3 is circulatedly connected to the cylinder liner of the generator, and contains circulating cylinder liner water. The bypass pipe 14 is connected to the second inlet pipe 12 and the outlet pipe 13 and is arranged in parallel with the heat exchanger 3. A valve assembly 15 is provided to control the flow direction of the cylinder liner water. The cold side of the heat exchanger 3 is connected to the inlet pipe of the waste heat boiler 2. The inlet pipe is used to supply room temperature water to the preheating boiler. The waste heat boiler 2 uses the high-temperature flue gas generated by the generator assembly 1 to heat the water inside and generate steam. When the generator assembly 1 is generating electricity, it generates a large amount of heat, which causes the temperature of the cylinder liner water to rise. Since the high-temperature cylinder liner water can exchange heat with the room temperature water entering the waste heat boiler in the heat exchanger 3, the temperature of the cylinder liner water is reduced, ensuring the normal operation of the generator assembly 1. At the same time, the temperature of the water entering the waste heat boiler 2 is increased, improving the thermal energy utilization rate and increasing the steam output of the waste heat boiler 2.

[0050] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A biogas power generation waste heat utilization system, characterized in that, It comprises: a generator assembly provided with a flue gas outlet; a generator cylinder sleeve sleeved on the outer periphery of the generator assembly, the inside of which is filled with cooling liquid; a waste heat boiler, which is in communication with the flue gas outlet; and a heat exchanger, the hot side of which is in circulation connection with the generator cylinder sleeve, and the cold side of which is connected with the water inlet pipeline of the waste heat boiler, so that the cooling liquid in the generator cylinder sleeve exchanges heat with the low-temperature water entering the waste heat boiler.

2. The biogas power generation waste heat utilization system according to claim 1, characterized in that, The biogas power generation waste heat utilization system further comprises a first water inlet pipe, a water softener and a soft water tank, one end of the first water inlet pipe is in communication with the water inlet of the soft water tank, the water softener is arranged in the first water inlet pipe, the water outlet of the soft water tank is in communication with the water inlet pipeline, and the soft water tank is further provided with a circulation inlet and a circulation outlet, and the circulation inlet and the circulation outlet are in communication with the cold side of the heat exchanger.

3. The biogas power generation waste heat utilization system according to claim 2, characterized in that, The generator assembly and the heat exchanger are both provided with a plurality of, and the cold sides of the plurality of heat exchangers are all in communication with the circulation inlet and the circulation outlet.

4. The biogas power generation waste heat utilization system according to claim 2, characterized in that, The biogas power generation waste heat utilization system further comprises a biogas boiler, and the water outlet of the soft water tank is in communication with the biogas boiler.

5. The biogas power generation and waste heat utilization system according to claim 1, characterized in that, The heat exchanger is a plate heat exchanger.

6. The biogas power generation and waste heat utilization system according to claim 1, characterized in that, The generator assembly comprises a cylinder sleeve water circulation pipeline, the cylinder sleeve water circulation pipeline comprises a second water inlet pipe, a water outlet pipe, a bypass pipe and a valve assembly, the generator cylinder sleeve, the water outlet pipe, the second water inlet pipe and the hot side of the heat exchanger are in circulation connection, the bypass pipe is in communication with the second water inlet pipe and the water outlet pipe, so that the heat exchanger and the bypass pipe are arranged in parallel, and the valve assembly is arranged on the pipeline in the cylinder sleeve water circulation pipeline and used for adjusting the flow of liquid entering the bypass pipe and the heat exchanger.

7. The biogas power generation waste heat utilization system according to claim 6, characterized in that, The valve assembly is arranged at the connection between the hot side of the heat exchanger and the second water inlet pipe or the water outlet pipe.

8. The biogas power generation waste heat utilization system according to claim 7, characterized in that, The valve assembly comprises a three-way valve.

9. The biogas power generation waste heat utilization system according to claim 7, characterized in that, The valve assembly comprises a valve seat, two valve plates and a driving member, the valve seat is provided with two channels, one of which is located in the second water inlet pipe or the water outlet pipe, and the other channel is in communication with the hot side of the heat exchanger and the second water inlet pipe or the water outlet pipe, the two valve plates are respectively rotatably arranged in the two channels, the two valve plates are perpendicular to each other, and the driving member is connected with the two valve plates to drive the two valve plates to rotate synchronously.

10. The biogas power generation waste heat utilization system according to claim 6, characterized in that, The valve assembly comprises a first valve, a second valve and a third valve, the first valve is arranged in the second water inlet pipe, the second valve is arranged in the water outlet pipe, and the third valve is arranged in the bypass pipe.

Images