Biogas direct-fired heating system

Abstract

The utility model relates to a biogas direct-fired heating system, which belongs to the technical field of biogas recycling, and is characterized in that biogas of an anaerobic jar is divided into two paths to be respectively connected with two booster fans after passing through a gas-water separator and a basket filter, and the two paths of biogas are combined into a biogas mother pipe after passing through the two booster fans; the biogas mother pipe is divided into two paths or multiple paths to respectively enter different combustors, the combustors are connected with the air preheater through pipelines, and the combustion fan is communicated with the combustors through air ducts. According to the utility model, air in the garbage bin is extracted to sequentially enter the air preheater, the combustion cylinder and the corresponding pipelines, the air preheater can be stopped or the air preheater is operated in a load-reducing manner when the biogas is put into linear combustion under the condition that the biogas amount is sufficient, and the biogas which is directly discharged to the atmosphere in the past can be fully utilized under the condition; and the steam consumption of the air preheater can be reduced, the biogas is recycled, the heat efficiency of the boiler can be effectively improved, and the carbon emission can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the biogas recycling technical field, specifically point to a kind of direct combustion heating system of biogas. BACKGROUND

[0002] In the garbage station, it needs to use garbage furnace to incinerate garbage, and when using garbage furnace to incinerate garbage, it needs to use linear combustor to heat the air conveyed into the garbage furnace.

[0003] At present, the biogas produced by anaerobic tank / pool is generally treated by torch combustion, but the biogas after combustion will emit a certain amount of sulfur dioxide to produce a pungent odor, which will cause great dissatisfaction of the surrounding residents, and will pollute the surrounding environment by emitting a certain amount of nitrogen oxides into the atmosphere, affecting the safe and environmentally friendly stable production, and the biogas produced by torch combustion will cause resource waste and is not conducive to resource recycling.

[0004] However, most of the existing garbage stations do not have a biogas recovery unit, and the biogas in the garbage bin is not recycled, which causes the biogas in the garbage bin to be directly discharged into the atmosphere, causing waste of resources. UTILITY MODEL CONTENT

[0005] The utility model solves the above technical problems, and provides a direct combustion heating system of biogas.

[0006] To solve the above technical problems, the utility model provides the technical scheme as follows:

[0007] A direct combustion heating system of biogas, comprising an anaerobic tank, a booster fan, a combustion air fan, a burner and an air preheater;

[0008] The biogas of the anaerobic tank is divided into two paths after passing through a gas-water separator and a basket filter, and is connected to two booster fans respectively, and is combined into a biogas main pipe after passing through the two booster fans, the biogas main pipe is divided into two or more paths and enters different burners respectively, the burner is connected to the air preheater through a pipeline, and the combustion air fan is connected to the burner through an air duct.

[0009] Preferably, a check valve is installed on the air duct of the burner and the combustion air fan.

[0010] Preferably, the burner comprises a combustion cylinder, and an air inlet connected to the air preheater and an air outlet connected to the garbage furnace are formed in the combustion cylinder.

[0011] Preferably, a wind collecting box is installed in the combustion cylinder, a partition is installed in the wind collecting box, and the wind collecting box is divided into an air inlet area and an air equalizing area by the partition, and a gas collecting box is installed opposite to the air equalizing area.

[0012] Preferably, the combustion fan is communicated with the air inlet area through an air duct, and the biogas main pipe is communicated with the gas collection tank.

[0013] Preferably, the outer side of the gas collection tank is provided with an inclined installed resistance plate, and the resistance plate, the partition plate, the gas collection tank and the resistance plate are all provided with through holes.

[0014] Preferably, the upper end of the combustion cylinder is provided with a ignition propeller, a flame detector and a fire observation hole.

[0015] After the above structure is used, the present application has the following advantages:

[0016] The air in the garbage bin is sequentially introduced into the air preheater, the combustion cylinder and the corresponding pipeline, under the condition that the biogas amount is sufficient, the air preheater can be stopped or reduced load operation after the biogas linear combustion is put into operation, in this case, the biogas directly discharged into the atmosphere in the past can be fully utilized, and the steam consumption of the air preheater can be reduced, the biogas can be recycled and utilized, and the boiler thermal efficiency can be effectively improved and the carbon emission can be reduced.

[0017] The above summary is only for the purpose of the description and is not intended to limit in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be apparent from the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0019] Figure 1 is a system connection schematic diagram of the present application;

[0020] Figure 2 is a connection schematic diagram of the burner of the present application;

[0021] Figure 3 is a structure schematic diagram of the burner of the present application;

[0022] Figure 4 is a sectional view of the wind collection tank of the present application.

[0023] As shown in the figure: 1, anaerobic tank; 2, booster fan; 3, combustion fan; 4, burner; 401, combustion cylinder; 402, air inlet; 403, air collecting box; 404, partition; 405, air inlet area; 406, air equalizing area; 407, air collecting box; 408, baffle; 409, air outlet; 5, air preheater; 6, fire damper; 7, through hole; 8, ignition propeller; 9, flame detector; 10, fire observation hole; 11, orifice plate flowmeter; 12, pneumatic quick closing valve; 13, electric regulating valve. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The present utility model is further described in detail below in combination with the whole text.

[0027] In combination with the accompanying drawings Figures 1-4 A biogas direct combustion heating system, comprising an anaerobic tank 1, a booster fan 2, a combustion fan 3, a burner 4 and an air preheater 5;

[0028] The biogas in the anaerobic tank 1 is divided into two paths after passing through a gas-water separator and a basket filter, and is connected to two booster fans 2 respectively, and is combined into a biogas main pipe after passing through the two booster fans 2, and the biogas main pipe is divided into two or more paths and enters different burners 4 respectively, the burner 4 is connected to the air preheater 5 through a pipeline, and the combustion fan 3 is connected to the burner 4 through an air duct.

[0029] A check valve is installed on the air duct of the burner 4 and the combustion fan 3.

[0030] The burner 4 comprises a combustion cylinder 401, and the combustion cylinder 401 is provided with an air inlet 402 communicating with the air preheater 5 and an air outlet 409 communicating with a garbage furnace.

[0031] The combustion cylinder 401 is provided with a wind collecting box 403, the wind collecting box 403 is provided with a partition plate 404, and the wind collecting box 403 is divided into an air inlet area 405 and an air equalizing area 406 by the partition plate 404, and the air equalizing area 406 is provided with a gas collecting box 407.

[0032] The combustion fan 3 is communicated with the air inlet area 405 through an air duct, and the biogas main pipe is communicated with the gas collecting box 407.

[0033] The outer side of the gas collecting box 407 is provided with an inclined blocking plate 408, and the blocking plate 408, the partition plate 404, the gas collecting box 407 and the blocking plate 408 are all provided with through holes 7.

[0034] The upper end of the combustion cylinder 401 is provided with an ignition propeller 8, a flame detector 9 and a fire observation hole 10, and the ignition propeller 8 and the flame detector 9 are prior art and will not be described here.

[0035] In the specific implementation of the utility model, as shown in the figure, Figure 1 The leachate is fermented in the anaerobic tank 1 to produce biogas, and the biogas is transported through a pipeline and divided into two paths, one path goes to a flare dispersion system, and the other path goes to a biogas combustion system;

[0036] The biogas going to the biogas combustion system passes through a gas-water separator and a basket filter and then goes to a biogas booster unit (a booster fan 2), the biogas booster unit is two Roots booster fans 2, one in use and one in standby, the front of the booster fan 2 is provided with a manual ball valve and a Y-shaped filter, the outlet of the fan is provided with a check valve and a manual ball valve, and the outlets of the two fans are combined into one path and go to a biogas main pipeline; one of the booster fans 2 is normally operated, and the two are switched once a month; when the pressure of the biogas main pipeline monitored by a pressure transmitter and a pressure switch monitor is lower than the set value, it is judged that the booster fan 2 is in failure, and the other booster fan 2 is automatically started, and the failed booster fan 2 can be stopped for maintenance; the inlet and outlet manual ball valves of the failed booster fan 2 can be repaired under the condition that the system is running;

[0037] When the biogas flow is extremely low, the bypass manual valve of the Roots fan can be opened, so that part of the biogas can circulate between the Roots fan and the bypass, and a small part of the biogas enters the burner for combustion, so that the system can still run stably;

[0038] A dispersion pipeline is installed on the biogas main pipeline, and nitrogen or carbon dioxide can be used to replace the biogas in the pipeline during initial operation or maintenance of the system, so as to prevent the biogas from mixing with air in the pipeline and causing explosion in an extreme case;

[0039] The biogas main pipe can be divided into two or more paths to enter different burners 4, respectively, pass through a manual ball valve, a Y-shaped filter, a flow meter, two pneumatic quick closing ball valves 12, a flame arrestor 6, an electric regulating valve 13 and a manual ball valve; a pneumatic diffuser quick closing ball valve is installed between the two pneumatic quick closing ball valves 12, which can detect whether there is a leakage when the gas pipeline is put into operation; before the biogas enters the linear burner, it is divided into two paths, one of which is a long-lasting lamp pipeline with a relatively thin pipeline, which remains in operation after ignition, and the flame shape and intensity are relatively stable, which can avoid the situation of linear burner flameout;

[0040] The other path is a main flame pipeline with a relatively thick pipeline, and the regulating valve can adjust the flow of the flame, and control the biogas flow according to the requirements of the system;

[0041] The linear burner of the system is a special-shaped linear burner of the device, and the biogas and combustion air enter the burner 4 and are sprayed out for combustion at different nozzles. Because the biogas and combustion air nozzles are at a certain angle, the mixture is fully mixed, the flame is short, it can adapt to various working conditions, and it can be directly installed inside the pipeline; a plurality of perforated distribution plates are arranged in the biogas and combustion air passages, so that the flow of biogas or combustion air of each nozzle is basically the same;

[0042] Before the garbage furnace is operated, the external induced draft fan is put into operation to extract air from the garbage bin and continuously send it into the air preheater 5, the combustion cylinder of the burner 4 and the corresponding pipeline; under the condition that the biogas quantity is sufficient, the air preheater 5 can be stopped or operated at reduced load when the biogas linear burner 4 is put into operation, which can fully utilize the biogas directly discharged into the atmosphere in the past, reduce the steam consumption of the air preheater, effectively improve the thermal efficiency of the boiler and reduce carbon emissions;

[0043] The flame direction of the linear burner 4 is in the same direction as the air flow, which can fully utilize the original layout of the pipeline, reduce the change of the pipeline layout, simplify the pipeline design, and design the combustion cylinder of the linear burner 4 to be smaller and more compact, effectively reducing the initial investment;

[0044] The combustion air pipeline is provided with a combustion air fan 3, a check valve assembly and a flexible connection. The combustion air fan 3 is controlled by frequency conversion, which can automatically adjust the combustion air volume according to the change of the biogas flow. The check valve assembly can prevent the backflow of hot air in the primary air pipeline to the combustion air fan 3, which can burn the equipment;

[0045] The combustion cylinder 401 is in the form of a square, and the inlet and outlet are circular, and the inside is filled with castable, which can fully mix the low-temperature cold air with the high-temperature flue gas generated by combustion, and the outlet temperature distribution is more uniform, avoiding local high temperature damage to the pipeline;

[0046] The system can fully absorb the change of upstream biogas pressure, and can adjust the change of pipeline pressure by adjusting the Roots blower 2 and the opening of the biogas regulating valve.

[0047] The system is provided with a combustible gas alarm beside the Roots blower 2 and the linear burner 4, and when biogas leakage occurs at the pipeline and valve interface, an audible and visual alarm can be issued to remind nearby personnel to evacuate and shut down the system.

[0048] The system is provided with a water drainage pipeline at all pipeline low points, and the accumulated water in the pipeline can be discharged when necessary.

[0049] The system is provided with a nitrogen flushing port beside the biogas inlet and the linear burner 4, and the nitrogen flushing port can be used to replace the biogas in the pipeline during initial operation and shutdown maintenance of the system.

[0050] The system is provided with a flame arrestor 6 in the biogas pipeline in front of each linear burner 4, which can effectively prevent backfire of the biogas in extreme cases and improve the safety of the system operation.

[0051] The above describes the present application and its embodiments, which are not limited, and the embodiments shown in the full text are only one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired, without departing from the creative purpose of the present application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the present application.

Claims

1. A biogas direct-fired heating system, characterized in that, It comprises an anaerobic tank (1), a booster fan (2), a combustion fan (3), a burner (4) and an air preheater (5); The biogas of the anaerobic tank (1) is separated by a gas-water separator and a basket filter, and then is divided into two paths to connect two booster fans (2), and then is combined into a biogas main pipe after passing through the two booster fans (2), and then is divided into two or more paths to enter different burners (4), and then is connected to the air preheater (5) through a pipeline, and then is connected to the burners (4) through an air duct.

2. The biogas direct-fired heating system of claim 1, wherein: Check valves are installed on the air ducts of the burners (4) and the combustion fan (3).

3. The biogas direct-fired heating system of claim 1, wherein: The burner (4) comprises a combustion cylinder (401), and the combustion cylinder (401) is provided with an air inlet (402) connected to the air preheater (5) and an air outlet (409) connected to a garbage furnace.

4. The biogas direct-fired heating system of claim 3, wherein: A wind collecting box (403) is installed in the combustion cylinder (401), a partition plate (404) is installed in the wind collecting box (403), the wind collecting box (403) is divided into an air inlet area (405) and an air equalizing area (406) by the partition plate (404), and a gas collecting box (407) is oppositely installed in the air equalizing area (406).

5. The biogas direct-fired heating system of claim 4, wherein: The combustion fan (3) is connected to the air inlet area (405) through an air duct, and the biogas main pipe is connected to the gas collecting box (407).

6. The biogas direct-fired heating system according to claim 5, wherein: A baffle (408) is obliquely installed on the outside of the gas collecting box (407), and through holes (7) are formed in the baffle (408), the partition plate (404), the gas collecting box (407) and the baffle (408).

7. The biogas direct-fired heating system of claim 3, wherein: A fire igniting propeller (8), a flame detector (9) and a fire observation hole (10) are installed on the combustion cylinder (401).

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