阅读说明：本技术 一种环保的垃圾填埋气体发电预处理装置及其处理方法 (Environment-friendly landfill gas power generation pretreatment device and treatment method thereof ) 是由 刘田田 于 2020-05-07 设计创作，主要内容包括：本发明公开了一种环保的垃圾填埋气体发电预处理装置及其处理方法,所述预处理装置包括经管路依次串联的收集管网(101)、一号气泵(102)、汇总管(103)、除沫分离器(104)、二号气泵(105)、初级干燥装置(106)、脱硫装置(107)、次级干燥装置(108)、三号气泵(109)、精滤器(110)、四号气泵(111)、稳压储气罐(112)；本发明公开的处理工艺流程短,气压稳定,能耗少,环保节能。(The invention discloses an environment-friendly landfill gas power generation pretreatment device and a treatment method thereof, wherein the pretreatment device comprises a collecting pipe network (101), a first air pump (102), a collecting pipe (103), a defoaming separator (104), a second air pump (105), a primary drying device (106), a desulfurization device (107), a secondary drying device (108), a third air pump (109), a fine filter (110), a fourth air pump (111) and a pressure-stabilizing air storage tank (112) which are sequentially connected in series through pipelines; the treatment process disclosed by the invention is short in flow, stable in air pressure, less in energy consumption, environment-friendly and energy-saving.)

1. An environment-friendly landfill gas power generation pretreatment device is characterized in that a collecting pipe network (101), a first air pump (102), a collecting pipe (103), a defoaming separator (104), a second air pump (105), a primary drying device (106), a desulfurization device (107), a secondary drying device (108), a third air pump (109), a fine filter (110), a fourth air pump (111) and a pressure stabilizing air storage tank (112) are sequentially connected in series through pipelines; the collecting pipe network (101) is provided with a plurality of landfill gas collecting pipes (1011) which are horizontally arranged in a landfill layer of the landfill site, and the landfill gas collected by the landfill gas collecting pipes (1011) is uniformly pumped by a first air pump (102) and then flows into a collecting pipe (103); the collecting pipe (103) is sequentially connected with a downstream gas processing device.

2. The environmental-friendly landfill gas power generation pretreatment device according to claim 1, wherein the landfill gas collecting pipe (1011) is a high-density polyethylene perforated pipe, air guide holes are uniformly distributed on the periphery of the pipe wall, and geotechnical cloth is wrapped on the outside of the pipe wall.

3. The environmental-friendly landfill gas power generation pretreatment device according to claim 1, wherein the collecting pipe (103) is introduced into the demister (104) from above the demister (104), gas-liquid-solid separation is performed in the demister (104), liquid water and dust impurities are discharged from a lower outlet of the demister (104), and the separated landfill gas is output from above the demister (104).

4. The environmental-friendly landfill gas power generation pretreatment device of claim 1, wherein the primary drying device (106) and the secondary drying device (108) are cooling and dewatering devices, and the pipe walls of the inlet air flue of the primary drying device are provided with natural zeolite coatings (1061) for primary filtration of the landfill gas; the desulphurization device (107) is a desulphurization tower.

5. The environmental-friendly landfill gas power generation pretreatment device of claim 1, wherein a plurality of biogas membranes are arranged in the fine filter (110).

6. The environmental-friendly landfill gas power generation pretreatment device of claim 1, wherein the collection pipe (103), the buffer tank (111) and the pressure-stabilizing gas storage tank (113) are all provided with gas pressure sensors.

7. The method for disposing of an environmentally friendly landfill gas power generation pretreatment device of any one of claims 1 to 6, including the steps of:

garbage landfill gas is collected, and the garbage landfill gas collected by the garbage landfill gas collecting pipe (1011) is collected into the collecting pipe (103) by the uniform air pumping of the first air pump (102);

II, gas-liquid separation, namely introducing the landfill gas raw material in the collecting pipe (103) into a defoaming separator (104) for solid-gas separation and gas-liquid separation, discharging impurities such as soil dust, sewage and the like from an outlet at the lower part of the defoaming separator (104), and discharging the separated landfill gas from the defoaming separator (104);

III, primary drying, namely introducing the separated landfill gas into a primary drying device (106) for primary drying to remove part of water vapor;

IV, desulfurization, namely introducing the landfill gas from which part of water vapor is removed into a desulfurization device for desulfurization and purification;

v, secondary drying, namely performing secondary drying on the desulfurized landfill gas;

fine filtering, namely introducing a fine filter (110) for fine filtering;

and VII, storing, namely conveying the finely filtered landfill gas into a pressure-stabilizing air storage tank (112) through a fourth air pump (111) for storage and standby.

8. The method as claimed in claim 7, wherein the water content of the refuse landfill gas after the secondary drying in the step V is controlled to be less than 50% of relative humidity, and the methane content of the refuse landfill gas after the fine filtration in the step VI is more than 95%.

Technical Field

The invention relates to the field of landfill gas power generation, in particular to an environment-friendly landfill gas power generation pretreatment device and a treatment method thereof.

Technical Field

With the increasing expansion of cities and the improvement of the living standard of people, the number of municipal solid wastes is increasing, and the waste treatment becomes an important component in the environmental protection industry. In China, at present, more than 70 percent of municipal domestic garbage is collected in a centralized manner and then transported to a local garbage landfill plant for landfill treatment. During the landfill process, the organic matter in the garbage is fermented to produce a large amount of biogas (LFG landfill gas), the main component of which is methane. The biogas consists of 50-80% of methane (CH 4), 20-40% of carbon dioxide (CO 2), 0-5% of nitrogen (N2), less than 1% of hydrogen (H2), less than 0.4% of oxygen (O2), 0.1-3% of hydrogen sulfide (H2S) and the like. Biogas is odorous because it contains a small amount of hydrogen sulfide. Its characteristics are similar to natural gas. If the air contains 8.6-20.8% (by volume) of methane, explosive mixed gas is formed. If the marsh gas is directly discharged into the atmosphere, the environment is polluted, the marsh gas is extremely easy to explode when the temperature is increased in summer, and the marsh gas is also energy waste. The existing solution is mainly to generate electricity through a gas collection system, a pretreatment system and a power generation system, and the electricity is merged into a large urban power grid to provide clean energy for power consumers. However, because the purity of the biogas generated by the landfill site is low, the biogas contains a large amount of saturated steam, a plurality of trace impurities and even solid impurities which cannot be combusted, and if the biogas is not completely treated, the power generation equipment can be damaged, so that the pretreatment of the biogas in the landfill gas power generation is very critical, and the current pretreatment technical scheme has problems and defects, such as complex process, large system power consumption, unstable gas pressure and the like, which are urgently needed to be solved.

Disclosure of Invention

Aiming at the defects, the invention provides the environment-friendly landfill gas power generation pretreatment device and the treatment method thereof, and the treatment process is compact in flow, stable in air pressure, low in energy consumption, environment-friendly and energy-saving.

In order to achieve the purpose, the invention provides the following technical scheme:

an environment-friendly landfill gas power generation pretreatment device is characterized in that a collecting pipe network, a first air pump, a header pipe, a defoaming separator, a second air pump, a primary drying device, a desulfurization device, a secondary drying device, a third air pump, a fine filter, a fourth air pump and a pressure-stabilizing air storage tank are sequentially connected in series through pipelines; the collecting pipe network is provided with a plurality of landfill gas collecting pipes which are horizontally arranged in a landfill layer of the landfill site, and the landfill gas collected by the landfill gas collecting pipes is uniformly pumped by a first air pump and then is converged into a collecting pipe; the collecting pipe is sequentially connected with a downstream gas processing device. The equipment combination is reasonable, the whole set of device can be connected through four air pumps, the air pressure is stable, and the overall cost is low.

Furthermore, according to the environment-friendly landfill gas power generation pretreatment device, the landfill gas collecting pipe is a high-density polyethylene perforated pipe, air guide holes are uniformly distributed in the periphery of the pipe wall, and geotechnical cloth is wrapped outside the pipe wall. The polyethylene perforated pipe is easy to obtain and corrosion resistant.

Further, above-mentioned landfill gas electricity generation preprocessing device of environmental protection, the manifold is followed the top of demister lets in the demister carries out gas-liquid-solid separation in the demister, and liquid water and dust impurity are discharged from demister separator lower part export, and the landfill gas after the separation is exported from demister top.

Further, according to the environment-friendly landfill gas power generation pretreatment device, the primary drying device and the secondary drying device are both cooling and dewatering devices, and natural zeolite coatings are arranged on the pipe walls of the inlet air passages of the primary drying device and the secondary drying device to perform primary filtration on landfill gas; the desulfurizing device is a desulfurizing tower. The landfill gas coming out of the demister is at a higher temperature and needs to be cooled and further dewatered.

Furthermore, according to the environment-friendly landfill gas power generation pretreatment device, a plurality of biogas membranes are arranged in the fine filter. The arrangement of a plurality of methane membranes can thoroughly filter the landfill gas.

Further, according to the environment-friendly refuse landfill gas power generation pretreatment device, air pressure sensors are arranged in the collection pipe, the buffer tank and the pressure stabilizing air storage tank. The air pressure sensors are arranged in the multiple devices, so that the running condition of the whole device can be better monitored.

Further, the treatment method of the environment-friendly landfill gas power generation pretreatment device comprises the following steps:

I. collecting the landfill gas, wherein the landfill gas collected by the landfill gas collecting pipe is uniformly pumped by a first air pump and then is converged into a collecting pipe;

II, gas-liquid separation, namely introducing the landfill gas raw material in the collecting pipe into a defoaming separator for solid-gas separation and gas-liquid separation, discharging impurities such as soil dust and sewage from an outlet at the lower part of the defoaming separator, and discharging the separated landfill gas from the defoaming separator;

III, primary drying, namely introducing the separated landfill gas into a primary drying device for primary drying to remove part of water vapor;

IV, desulfurization, namely introducing the landfill gas from which part of water vapor is removed into a desulfurization device for desulfurization and purification;

v, secondary drying, namely performing secondary drying on the desulfurized landfill gas;

fine filtering, and introducing a fine filter for fine filtering;

and VII, storing, namely conveying the finely filtered landfill gas into a pressure-stabilizing gas storage tank through a fourth air pump for storage and standby.

Further, after the secondary drying in the step V, the water content is controlled to be below 50% of relative humidity, and after the fine filtration in the step VI, the methane content in the landfill gas is above 95%.

The scheme shows that the invention at least has the following beneficial effects: the invention discloses an environment-friendly landfill gas power generation pretreatment device and a treatment method thereof, which effectively remove impurities such as water, sulfur, particulate matters and the like in landfill gas in a landfill site by sequentially connecting a defoaming separator, a drying device, a desulfurization device, a fine filtering device and a pressure stabilizing device, and the quality of supplied gas can fully meet the requirement of stable and reliable operation of a biogas power generation unit.

Drawings

FIG. 1 is a schematic view of a power generation pretreatment apparatus for landfill gas described in example 1;

FIG. 2 is a schematic view of a power generation pretreatment apparatus for landfill gas described in embodiment 2;

wherein, a 101 collecting pipe network, a 1011 landfill gas collecting pipe, a 102 first air pump, a 103 collecting pipe, a 104 defoaming separator, a 105 second air pump, a 106 primary drying device, a 1061 natural zeolite coating, a 107 desulfurizing device, a 108 secondary drying device, a 109 third air pump, a 110 fine filter, a 111 fourth air pump and a 112 pressure stabilizing and air storage tank.

Detailed Description

The invention will be further elucidated by means of several specific examples, which are intended to be illustrative only and not limiting.