CN214664492U

CN214664492U - Biogas recovery heat supply system

Info

Publication number: CN214664492U
Application number: CN202120475013.XU
Authority: CN
Inventors: 冯泽操
Original assignee: Guangzhou Unite New Energy Science & Technology Co ltd
Current assignee: Guangzhou Unite New Energy Science & Technology Co ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-11-09
Anticipated expiration: 2031-03-05

Abstract

The utility model discloses a biogas recovery and heat supply system, wherein a conveying fan is communicated with a desulfurizing device, the desulfurizing device is communicated with a discharge burner, the desulfurizing device is also communicated with a biogas burner for providing heat energy for a boiler, the biogas burner is connected with the discharge burner in parallel, biogas generated by a biogas digester is collected and then is pressurized and conveyed by the conveying fan, two branches are divided at the outlet of the desulfurization device, one branch is introduced into the discharge burner, the other branch is introduced into the biogas burner of the heat-using equipment, when the biogas burner is normally stopped, fails or has insufficient biogas pressure, the system can automatically switch to the discharge combustion mode of the discharge combustor or shut down the whole gas transmission system, and automatically recover to the mode of supplying heat by the biogas combustor after the biogas combustor is stopped, has faults and is relieved of underpressure, and has the advantages of long-distance transportation and combustion, environmental protection discharge, safety tempering and the like.

Description

Biogas recovery heat supply system

Technical Field

The utility model belongs to energy recycling, in particular to a system for converting methane into heat energy after recovery.

Background

The biogas production system has wide biogas resources, comprises sewage treatment, biological fermentation, biomass energy source preparation and the like, and can utilize the generated biogas to achieve the purposes of saving energy consumption and reducing operation cost.

At present, when domestic factories treat biogas generated by sewage, a small amount of biogas is generally discharged into the atmosphere, and if the amount of the biogas meets a large amount of gas, the biogas is directly discharged for combustion or is sent into heat-using equipment (such as a biogas boiler) for combustion and heat supply. The method for treating the waste gas directly discharged into the atmosphere not only can generate the environment pollution condition, but also can cause energy waste, the burner is frequently failed and stopped because of unstable air pressure when the waste gas is sent into heat-using equipment for combustion, and the waste gas is also manually discharged for pressure relief, and the waste gas is manually reset for combustion after the air pressure meets the requirement and then is put into a combustion state. The mutual conversion operation in the process is troublesome, the phenomena of environmental pollution and energy waste are caused, and certain potential safety hazards also exist.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solve above-mentioned problem, provide an effective recycle of resource, do not need the marsh gas recovery heating system of manual operation marsh gas burning situation.

In order to realize the above purpose, the utility model discloses the technical scheme who takes is: a biogas recovery and heat supply system comprises a conveying fan for introducing biogas into the system, the conveying fan is communicated with a desulfurization device, the desulfurization device is communicated with a discharge burner, the desulfurization device is also communicated with a biogas burner for providing heat energy for a boiler, and the biogas burner is connected with the discharge burner in parallel.

Preferably, the discharge burner and the biogas burner are electrically connected with a PLC controller.

Preferably, an electromagnetic valve is arranged between the desulfurization device and the discharge burner.

Preferably, an electromagnetic valve is arranged between the desulfurization device and the biogas burner.

Preferably, a flame arrester is arranged between the conveying fan and the desulfurization device.

Implement the utility model discloses technical scheme: the biogas generated by the biogas digester is pressurized and conveyed by a conveying fan, two branches are divided at the outlet of the desulfurization device, one branch is introduced into the discharge burner, the other branch is introduced into the biogas burner of the heat-using equipment, when the biogas burner is normally stopped, fails or has insufficient biogas pressure, the discharge combustion mode of the discharge burner can be automatically switched to or the whole gas conveying system is shut down, and the mode of supplying heat by the biogas burner is automatically recovered after the shutdown, failure and underpressure of the biogas burner are relieved, so that the biogas digester has the following characteristics:

1. the conveying fan is adopted to convey the biogas in a pressurizing manner, so that the biogas source pressure required by the biogas burner can be kept, and the long-distance conveying and burning can be realized.

2. The pipeline system is provided with the desulphurization device, so that the pollution of sulfur dioxide gas generated in combustion to the environment can be reduced, and the environment-friendly emission of flue gas is achieved.

3. Flame arresters are arranged on the main pipe outlet and the branch pipes of the pipeline system, so that the problem of backfire safety generated when the air pressure is low or the burner is flamed out can be prevented.

4. Each branch is controlled by a solenoid valve through a PLC (programmable logic controller), so that the air source of a fault section is closed or opened at the first time of equipment fault, and the equipment on the branch pipeline is started to be put into use.

5. The double protection measures of the feedback control of the equipment signal and the pressure detection control of the system are more beneficial to the stable and safe operation of the system.

6. Under the combustion heat supply state mainly using a biogas burner, when the used equipment fails or can not work normally, the failure can be automatically detected, and the other standby branch can be quickly and automatically started to carry out biogas combustion, so that the biogas leakage or the overpressure phenomenon of the system can be prevented.

Drawings

Fig. 1 is a schematic diagram of a methane recovery heating system.

FIG. 2 is a schematic view of a desulfurization unit.

Detailed Description

As shown in fig. 1, the biogas recovery heating system mainly comprises a conveying fan 1, a flame arrester 3, a desulphurization device 6, a discharge burner 4, a pressure controller 7, a biogas burner 12, an air distribution fan 8 and a PLC controller 13. A pressure controller 7 and an electromagnetic valve 5 are arranged between the desulphurization device 6 and the discharge combustor, an electromagnetic valve 9 and a pressure reducing valve 10 are arranged between the desulphurization device 6 and the biogas combustor 12, and the negative pressure of the discharge combustor 4 is provided by an air distribution fan 8. The mechanical equipment is connected by a gas pipeline to form a biogas recovery and heat supply system, biogas generated by sewage treatment is pressurized by the conveying fan 1 and then conveyed to the discharge combustor 4 and the biogas combustor 12 through the desulfurization device 6 for combustion, and the biogas combustor generates combustion heat energy to be supplied to the biogas boiler 11.

When the biogas burner 12 of the biogas boiler 11 starts to burn, the electromagnetic valve 9 is opened and the electromagnetic valve 5 is closed. When the biogas burner 12 fails or the biogas boiler controls the biogas burner 12 to stop, the PLC 13 obtains a stop signal fed back by the PLC, controls the electromagnetic valve 5 to be opened, controls the air distribution fan 8 to be started, controls the exhaust burner 4 to be started for ignition and combustion, and controls the electromagnetic valve 9 to be closed.

When the biogas burner 12 is cleared of faults or normally controlled to start, a feedback signal is sent to the PLC 13, the electromagnetic valve 9 is controlled to open and close the electromagnetic valve 5, the exhaust burner 4 is extinguished, and the air distribution fan 8 is delayed to close. When the system pressure is lower than the set value and does not meet the combustion condition, the pressure controller 7 feeds back a signal to the PLC 13 to control the biogas burner 12 to be extinguished or the biogas burner 4 to be discharged, and correspondingly the conveying fan 1, the air distribution fan 8, the electromagnetic valve 5 and the electromagnetic valve 9 to be shut down. When the delivery fan is out of order, it feeds back a signal to the PLC controller 13, and the control also performs the above-described operation.

When the discharge burner 4 and the biogas burner 12 cannot be started due to faults or other reasons at the same time, signals are fed back to the PLC 13 to control the stop of the conveying fan 1 and the closing of the electromagnetic valves 5 and 9 correspondingly. The pressure controller 7 can also feed back a signal exceeding a limit value to the PLC controller 13 to implement the pressure reducing valve 10, and double protection measures can be implemented.

As shown in fig. 2, the desulfurization device 6 is provided with a partition plate 6.1, and a desulfurization chamber 6.2 is provided above the partition plate. A marsh gas inlet 6.3 is arranged below the desulphurization chamber 6.2 of the desulphurization device 1, a marsh gas outlet 6.4 is arranged at the top of the desulphurization device 1, and the marsh gas outlet 6.4 is communicated with the desulphurization chamber 6.2. The upper end of the clapboard 5 is provided with an air injection pipe 6.4, the upper end of the air injection pipe 6.4 is sealed, and the pipe wall of the air injection pipe is provided with a plurality of air injection ports. And 6.5 solid desulfurizer is filled between the periphery of the gas injection pipe and the inner wall of the desulphurization device 1, and the filling height of the solid desulfurizer is greater than the gas injection port position of the gas injection pipe. The marsh gas enters an air injection pipe 6.4, then flows out from an air injection port to react with a solid desulfurizer, and hydrogen sulfide gas is removed.

Claims

1. The utility model provides a heating system is retrieved to marsh gas, includes the conveying fan with marsh gas introducing system, and conveying fan intercommunication desulphurization unit, desulphurization unit intercommunication discharge combustor, its characterized in that: the desulfurization device is also communicated with a biogas burner for providing heat energy for the boiler, and the biogas burner is connected with the discharge burner in parallel.

2. The biogas recovery heating system of claim 1, wherein the discharge burner and the biogas burner are electrically connected to a PLC controller.

3. A biogas recovery heating system according to claim 1, wherein an electromagnetic valve is provided between the desulphurisation device and the discharge burner.

4. The biogas recovery heating system according to claim 1, wherein an electromagnetic valve is provided between the desulfurization device and the biogas burner.

5. The biogas recovery heating system according to claim 1, wherein a flame arrester is arranged between the conveying fan and the desulfurization device.