Biomass boiler for boiler front flue gas drying and continuous bale combustion

Abstract

The invention discloses a biomass boiler for boiler front flue gas drying and continuous bale combustion, and belongs to the technical field of biomass combustion. By adoption of the biomass boiler, problems of an existing biomass bale combustion technology are solved. The biomass boiler comprises a biomass boiler body. A drying area is arranged in front of a feed inlet of the biomass boiler body. Baled biomass is fed into the feed inlet after passing through the drying area. A water-cooling reciprocating grate is arranged at the bottom of a hearth of the biomass boiler body. A flue gas suction port is formed in a tail flue of the biomass boiler body and connected with a flue gas inlet device arranged at the bottom of the drying area. A coal economizer, an air pre-heater, a bag type dust collector, a second induced draught fan and a condensing heat exchanger are sequentially distributed in the tail flue of the biomass boiler body, wherein the air pre-heater is connected with and provides pre-heated air for an air chamber at the bottom of the hearth and secondary air ports formed in the two sides of a front arch of the hearth; and the condensing heat exchanger is sequentially connected with the water-cooling reciprocating grate, the coal economizer and a steam pocket of the biomass boiler body. The biomass boiler for boiler front flue gas drying and continuous bale combustion is used for combustion of baled biomass.

Description

technical field [0001] The invention belongs to the technical field of biomass combustion, and in particular relates to a furnace flue gas drying continuous bundled combustion biomass boiler. Background technique [0002] With the intensification of the greenhouse gas effect caused by the consumption of fossil energy, it is imminent to find a clean and reliable energy source. Biomass energy is widely regarded as a "CO 2 Therefore, the application of biomass energy has received extensive attention worldwide, and biomass combustion technology is currently the most mature biomass application technology. [0003] Due to the scattered sources of crop straw, certain costs are required for collection, transportation, and storage. At present, it is mainly sent to a biomass power plant in bundles (packages), and then burned to generate electricity after being broken up, or processed into briquettes after drying. Since the briquette fuel is 800-1000 yuan per ton, the economy is poor,...

AI Technical Summary

Problems solved by technology

[0005] A biomass boiler with flue gas drying in front of the furnace, which is continuously bundled and fired. The smoke inlet device draws hot flue gas at 350-400°C to dry the bundled biomass. A smoke exhaust device and an induced draft fan 1 are installed above the drying area to suck the hot flue gas sent from the bottom and dry the grass The moisture in the bundle is sucked out, and at the same time, under the suction of the induced draft fan 1, a small part of the high-temperature flue gas in the furnace is also sucked into the bundle, which is dried like smoking and ignites the biomass. The smoke exhaust device is connected to the air inlet of the induced draft fan 1 , the air outlet of the induced draft fan 1 is respectively connected with the furnace and the front smoke box of the biomass boiler body, and a flow regulating valve is respectively set between the air outlet of the induced draft fan 1 and the furnace and the front smoke box of the biomass boiler body. The flue gas flow in the furnace and the front smoke box is controlled, and the water vapor-containing flue gas entering the furnace plays a role in controlling the furnace temperature, which is conducive to reducing the generation of NOx; The temperature of the flue gas is lowered to solve the problem of clogging the entrance of the threaded smoke pipe and the accumulation of dust in the pipe;

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