Synchronous double-bed air feeding method and structure for updraught type fixed bed gasifiers

Abstract

The invention aims to provide a synchronous double-bed air feeding method and structure for updraught type fixed bed gasifiers so as to improve thermal power of the gasfiers and avoid energy waste. The synchronous double-bed air feeding structure for the updraught type fixed bed gasifiers comprises two gasifiers, wherein a fuel gas output port of each gasfier is connected with a balancing box through a respective fuel gas conveying pipeline, and a gas outlet of the balancing box is connected with a burner of a boiler through a main fuel gas pipeline. The two gasfiers are connected in parallel, and fuel gas in each gasfier is mixed and input into the boiler for burning, so that the power requirement of the boiler with higher power can be met. When the boiler operates in a low power state, one gasfier can be closed, and energy waste is avoided. The balancing box is arranged and can mix fuel gas output by each gasfier, so that pressure inside the balancing box is controllable, the fuel gas in the gasifier with larger pressure can be prevented from flowing backward into the gasfier with lower pressure, and system safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of biomass energy utilization, and in particular relates to a double-bed synchronous gas supply method and structure of an updraft fixed-bed gasifier. Background technique [0002] Using biomass gasification technology to transform small coal-fired and heavy oil-fired boilers is an effective way to transform boilers, which can achieve the purpose of energy saving and emission reduction. For example, the "Central Outlet and Updraft Fixed Bed Gasifier" produced by Dongguan Baida New Energy Co., Ltd. (corresponding patent numbers: 200620058696.4, 201120030716.8) has achieved good results in replacing oil with biomass gas for boiler combustion. Using biomass gas for boiler combustion, the biomass gas produced by 3 to 3.5 tons of firewood can replace 1 ton of diesel oil, saving more than 50% of fuel costs. The emission of harmful gases in boiler exhaust is reduced, the best result is 80% emission reduction, and...

AI Technical Summary

Problems solved by technology

However, there is still a big problem with the use of biomass gas instead of oil, that is, the thermal power of a single gasifier can only meet the needs of 2 tons / hour boilers, while for industrial boilers with a capacity of 4 tons / hour and above can not meet the requirements

[0003] One of the ways to increase the thermal power of the gasifier is to expand the specifications of the existing gasifier, but there is a limit to expanding the capacity of a single unit: such as processing and conditions, higher requirements for materials; relatively lower operating reliability; more importantly, Boilers in use sometimes only need to run at low power, but gasifiers cannot run at low power, so there will be a phenomenon of "big horses and small carts", wasting energy

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