Tail gas desulfurization and denitrification purification system of biogas generator set

Abstract

The utility model discloses a tail gas desulfurization and denitrification purification system for biogas generator sets, which is characterized in that a plurality of generator sets, an oxidation processor, an activated carbon desulfurization tower, an activated carbon denitrification tower, a desulfurization activated carbon regeneration tower, a high-temperature flue gas steam type waste heat boiler, an exhaust chimney and a waste heat utilization pipe network are arranged in a biogas power plant, tail gas of all the generator sets is guided into the oxidation treater in a confluence mode, then sequentially passes through the activated carbon desulfurization tower and the activated carbon denitration tower to be subjected to desulfurization treatment and denitration treatment, then passes through the high-temperature flue gas steam type waste heat boiler to be subjected to heat exchange and then is exhausted through the exhaust chimney. Saturated steam generated by the high-temperature flue gas steam type waste heat boiler is conveyed to a waste heat utilization pipe network through a steam conveying pipeline. The purification system can perform desulfurization and dehydrogenation treatment on the tail gas of the generator set, and waste heat of the tail gas is effectively recycled to generate saturated steam which is supplied to production and living application in a factory area.

Description

Technical Field

[0001] This application relates to the field of biogas power generation technology, and in particular to a biogas generator set exhaust gas desulfurization and denitrification purification system. Background Technology

[0002] As a clean and environmentally friendly green energy source, the large-scale development and utilization of renewable energy has become an important way to solve the problems of energy shortage, environmental pollution, and the greenhouse effect caused by fossil fuels in the 21st century. Using methane obtained through biogas separation and purification to meet human energy needs is a major means of developing and utilizing biogas. However, in the development of biogas in my country, there has been a general tendency to emphasize promotion over scientific research, resulting in slow development of biogas technology and equipment. The full potential of biogas development has been difficult to realize, and its comprehensive utilization remains severely limited. Its economic potential development rate is less than 1%, and its ecological potential development rate is only around 4%, indicating a very broad development prospect. Therefore, the potential development and utilization of biogas has received widespread attention worldwide. The recovery and utilization of biogas from landfills is an economically feasible and environmentally beneficial technology. By improving the biogas collection rate, increasing the number of generator sets, and increasing power generation, it can effectively improve power generation efficiency. Biogas's main component is methane, and it consists of 50%-80% methane, 20%-40% carbon dioxide, 0%-5% nitrogen, less than 1% hydrogen, less than 0.4% oxygen, and 0.1%-3% hydrogen sulfide. To realize the clean energy potential of biogas power generation, the exhaust gas from the generator set needs to be desulfurized and dehydrogenated. Furthermore, the high-temperature flue gas produced after biogas power generation reaches temperatures as high as 400℃, and a large amount of this high-temperature flue gas is directly emitted into the atmosphere, resulting in heat waste. Utility Model Content

[0003] This application addresses the shortcomings of existing technologies by providing a biogas generator set exhaust gas desulfurization and denitrification purification system. This system can desulfurize and dehydrogenate the exhaust gas from the generator set and effectively recover and utilize the waste heat of the exhaust gas to generate saturated steam for production and daily life applications within the plant area.

[0004] This application solves the above-mentioned technical problems through the following technical solutions.

[0005] The biogas generator set exhaust gas desulfurization and denitrification purification system is installed in the biogas power plant, consisting of several generator sets, an oxidation processor, an activated carbon desulfurization tower, an activated carbon denitrification tower, a desulfurization activated carbon regeneration tower, a high-temperature flue gas steam type waste heat boiler, an exhaust chimney, and a waste heat utilization pipeline network. The exhaust gas from all generator sets is introduced into the oxidation processor in a combined manner, and then passes through the activated carbon desulfurization tower and the activated carbon denitrification tower for desulfurization and denitrification treatment in sequence. After heat exchange in the high-temperature flue gas steam type waste heat boiler, it is discharged through the exhaust chimney. The saturated steam generated by the high-temperature flue gas steam type waste heat boiler is transported to the waste heat utilization pipeline network through the steam transmission pipeline. The activated carbon after flue gas denitrification treatment in the activated carbon denitrification tower is supplied to the activated carbon desulfurization tower for flue gas desulfurization treatment. The activated carbon after flue gas desulfurization treatment in the activated carbon desulfurization tower is transported back to the desulfurization activated carbon regeneration tower for regeneration treatment and then supplied to the activated carbon desulfurization tower and the activated carbon denitrification tower respectively.

[0006] As a preferred option, the high-temperature flue gas steam type waste heat boiler is a threaded tube type waste heat boiler and is equipped with a main steam valve, a safety valve, an instrument valve, a vent valve, an upper blowdown valve, a feedwater valve, and a lower blowdown valve.

[0007] As a preferred option, tap water from the municipal water supply line is supplied to the high-temperature flue gas steam type waste heat boiler via a water pump.

[0008] As a preferred option, the bottom of the biogas power plant is equipped with a cable trench, and exhaust fans are used to ventilate the gas to the outside.

[0009] As a preferred option, air intake windows and exhaust fans are respectively installed on one or both side walls of the biogas power plant.

[0010] Preferably, the oxidation processor is equipped with a stainless steel honeycomb plate assembly with a platinum catalyst loaded on a titanium dioxide carrier surface. Each stainless steel honeycomb plate consists of a stainless steel etched pore front plate, a stainless steel etched pore rear plate, and a stainless steel honeycomb core. Both the stainless steel etched pore front plate and the stainless steel etched pore rear plate are provided with through irregular etched pores.

[0011] As a preferred option, the floor inside the biogas power plant is covered with anti-static flooring.

[0012] As a preferred option, the steam transmission pipeline uses DN125 galvanized steel pipe.

[0013] As a preferred option, the high-temperature flue gas steam type waste heat boiler adopts a steel support structure that is laid on the ground.

[0014] The beneficial effects of this application are:

[0015] 1. Unburned methane in the generator set's exhaust gas undergoes oxidation in the presence of a platinum catalyst loaded on a titanium dioxide carrier surface when passing through the oxidation processor. The purified exhaust gas obtained after the oxidation reaction has an increased temperature and then passes through an activated carbon desulfurization tower and an activated carbon denitrification tower for desulfurization and denitrification treatment. After heat exchange in a high-temperature flue gas steam waste heat boiler, it is directly discharged into the atmosphere through the exhaust chimney, realizing the clean energy function of biogas power generation, reducing sulfur scale formation, and maintaining the safe and reliable operation of the boiler equipment.

[0016] 2. By recovering and utilizing waste heat through a high-temperature flue gas steam-type waste heat boiler, the high-temperature flue gas of the biogas generator set undergoes efficient purification, desulfurization, and denitrification treatment. At the same time, the waste heat from the high-temperature flue gas generates saturated steam to supply production and living needs within the plant area. The waste heat recovery and utilization plays a role in energy conservation and consumption reduction. Attached Figure Description

[0017] The accompanying drawings are intended to illustrate preferred embodiments and do not constitute a limitation on the scope of protection of this application.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0019] In the diagram: 1-Oxidation processor, 2-Activated carbon desulfurization tower, 3-Activated carbon denitrification tower, 4-Desulfurization activated carbon regeneration tower, 5-High temperature flue gas steam type waste heat boiler, 6-Exhaust chimney, 7-Waste heat utilization pipeline network. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] like Figure 1As shown in the embodiment of this application, the biogas generator set exhaust gas desulfurization and denitrification purification system includes several generator sets, an oxidation processor 1, an activated carbon desulfurization tower 2, an activated carbon denitrification tower 3, a desulfurization activated carbon regeneration tower 4, a high-temperature flue gas steam type waste heat boiler 5, an exhaust chimney 6, and a waste heat utilization pipeline network 7, all housed within the biogas power plant. A cable trench is located at the bottom of the biogas power plant, and exhaust fans are used to ventilate the exhaust gas outdoors. Air inlet windows and exhaust fans are respectively installed on one or both side walls of the biogas power plant. The floor inside the biogas power plant is covered with anti-static flooring. The exhaust gas from all generator sets is fed into the oxidation processor 1 in a combined stream, then sequentially passes through the activated carbon desulfurization tower 2 and the activated carbon denitrification tower 3 for desulfurization and denitrification treatment, and finally passes through the high-temperature flue gas steam type waste heat boiler 5 for heat exchange before being discharged through the exhaust chimney 6. The oxidation processor 1 is equipped with a stainless steel honeycomb panel assembly with a platinum catalyst loaded on a titanium dioxide carrier surface. Each stainless steel honeycomb panel consists of a stainless steel etched pore front panel, a stainless steel etched pore rear panel, and a stainless steel honeycomb core. Both the stainless steel etched pore front panel and the stainless steel etched pore rear panel have through-hole irregular etched pores. Activated carbon after flue gas denitrification treatment in the activated carbon denitrification tower 3 is supplied to the activated carbon desulfurization tower 2 for flue gas desulfurization treatment. Activated carbon after flue gas desulfurization treatment in the activated carbon desulfurization tower 2 is transported back to the activated carbon regeneration tower 4 for regeneration treatment and then supplied to the activated carbon desulfurization tower 2 and the activated carbon denitrification tower 3 respectively.

[0022] Tap water from the municipal water supply line is pumped to supply water to the high-temperature flue gas steam-type waste heat boiler 5. The saturated steam generated by the high-temperature flue gas steam-type waste heat boiler 5 is transported to the waste heat utilization network 7 via a steam transmission pipeline. The steam transmission pipeline uses DN125 galvanized steel pipe. The high-temperature flue gas steam-type waste heat boiler 5 is an overhead structure with steel supports. The high-temperature flue gas steam-type waste heat boiler 5 is a threaded pipe type waste heat boiler and is equipped with a main steam valve, safety valve, instrument valve, vent valve, upper blowdown valve, feedwater valve, and lower blowdown valve.

[0023] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A biogas engine set tail gas desulfurization and denitrification purification system, characterized in that: in The biogas power plant is provided with a plurality of generator sets, an oxidation processor (1), an activated carbon desulfurization tower (2), an activated carbon denitration tower (3), a desulfurized activated carbon regeneration tower (4), a high-temperature flue gas steam type waste heat boiler (5), an exhaust chimney (6) and a waste heat utilization pipe network (7). The tail gas of all the generator sets is introduced into the oxidation processor (1) in a flow-converging manner, and then sequentially passes through the activated carbon desulfurization tower (2) and the activated carbon denitration tower (3) for desulfurization treatment and denitration treatment, and then passes through the high-temperature flue gas steam type waste heat boiler (5) for heat exchange and is discharged through the exhaust chimney (6). The saturated steam generated by the high-temperature flue gas steam type waste heat boiler (5) is transported to the waste heat utilization pipe network (7) through a steam delivery pipeline. The activated carbon in the activated carbon denitration tower (3) after flue gas denitration treatment is supplied to the activated carbon desulfurization tower (2) for flue gas desulfurization treatment. The activated carbon in the activated carbon desulfurization tower (2) after flue gas desulfurization treatment is transported back to the desulfurized activated carbon regeneration tower (4) for regeneration treatment and is then supplied to the activated carbon desulfurization tower (2) and the activated carbon denitration tower (3) for use.

2. The biogas engine set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: The high-temperature flue gas steam type waste heat boiler (5) is a threaded pipe type waste heat boiler and is provided with a main steam valve, a safety valve, an instrument valve, a vent valve, an upper blowdown valve, a feed water valve and a lower blowdown valve.

3. The biogas engine set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: Tap water from a tap water pipeline is supplied to the high-temperature flue gas steam type waste heat boiler (5) by a feed water pump.

4. The biogas generator set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: The bottom of the biogas power plant is provided with a cable trench, and the exhaust air is discharged to the outside through an exhaust fan.

5. The biogas generator set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: The biogas power plant is provided with a pair of side walls, and an air inlet window and an exhaust fan are arranged on each side wall, respectively.

6. The biogas generator set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: The oxidation processor (1) is provided with a plurality of stainless steel honeycomb plate groups coated with a titanium dioxide carrier surface loaded platinum catalyst. Each stainless steel honeycomb plate is composed of a stainless steel etched aperture front plate, a stainless steel etched aperture back plate and a stainless steel honeycomb core. The stainless steel etched aperture front plate and the stainless steel etched aperture back plate are both provided with irregular etched apertures.

7. The biogas generator set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: The floor of the biogas power plant is paved with an anti-static floor.

8. The biogas generator set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: The steam delivery pipeline adopts a DN125 galvanized steel pipe.

9. The biogas generator set tail gas desulfurization and denitrification purification system according to claim 1, characterized in that: The high-temperature flue gas steam type waste heat boiler (5) is arranged in an overhead laying structure on the ground by using a steel support.

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