CN-224215307-U - Denitration and dust removal integrated arrangement biomass grate boiler

CN224215307UCN 224215307 UCN224215307 UCN 224215307UCN-224215307-U

Abstract

The utility model discloses a denitration and dust removal integrated biomass grate boiler which comprises a second flue, a third flue and a fourth flue which are sequentially connected with an outlet of a hearth, wherein the second flue is communicated with the lower end part of the third flue, the upper end of the third flue is connected with the upper end of the fourth flue through a furnace top turning flue, a first screen type superheater is arranged at the upper part of the hearth, a second screen type superheater is arranged in the second flue, a serpentine pipe superheater is arranged in the third flue, denitration equipment, a coal economizer and a tail heating surface are sequentially arranged in the fourth flue according to the flue gas flow direction, dust removal equipment is arranged in the furnace top turning flue, and the dust removal equipment and the denitration equipment are supported on a boiler body steel frame. The dust removing equipment and the denitration equipment are also arranged in the range of the boiler body, compared with the prior art, the length of the inlet flue and the outlet flue is greatly shortened, the heat dissipation loss is reduced, the boiler efficiency is improved, the dust removing and denitration effects can be improved, the occupied area is small, and the construction cost is low.

Inventors

GUO HUIPENG
WANG HAIFENG
LI MINGYANG
QIN BEIBEI
XU GUANGCAN

Assignees

济南锅炉集团有限公司

Dates

Publication Date: 20260508
Application Date: 20250512

Claims (9)

1. A denitration and dust removal integrated biomass grate boiler comprises a boiler body steel frame, a hearth, a second flue, a third flue and a fourth flue, wherein the second flue, the third flue and the fourth flue are sequentially connected with an outlet of the hearth, the second flue, the third flue and the fourth flue are vertically arranged, an inlet of the second flue is connected with the outlet of the hearth, the second flue is communicated with the lower end part of the third flue, and the upper end of the third flue and the upper end of the fourth flue are connected through a furnace top turning flue.
2. The integrated denitration and dedusting biomass grate boiler of claim 1, wherein the dedusting equipment and the denitration equipment are supported on a boiler body steel frame.
3. The integrated denitration and dedusting biomass grate boiler disclosed in claim 1 is characterized in that a grate and a slag hole are arranged at the lower part of a hearth, an air chamber is arranged at the lower part of the grate, ash falling holes are arranged at the lower parts of a second flue and a third flue, a slag extractor is arranged at the lower parts of the slag hole and the ash falling hole, an ash smoothing pipe is arranged at the lower part of the dedusting equipment, and the lower end of the ash smoothing pipe extends into the lower part of the liquid level in the slag extractor.
4. The integrated denitration and dedusting biomass grate boiler disclosed in claim 3 is characterized in that a cylindrical guard plate is arranged between the slag hole and the ash drop hole and the slag dragging machine, the upper end of the cylindrical guard plate is connected with the slag hole and the ash drop hole, and the lower end of the cylindrical guard plate extends into the lower part of the liquid level in the slag dragging machine.
5. The integrated denitration and dedusting biomass grate boiler of claim 4, wherein the horizontal section of the cylindrical guard plate is shaped like a Chinese character 'ri', and two openings of the Chinese character 'ri' correspond to the slag outlet and the ash falling opening respectively.
6. The integrated denitration and dedusting biomass grate boiler of claim 1, wherein the serpentine tube superheater comprises an upper serpentine tube superheater and a lower serpentine tube superheater.
7. The integrated denitration and dedusting biomass grate boiler of claim 1 is characterized in that the tail heating surface is the heating surface of the air preheater.
8. The integrated denitration and dedusting biomass grate boiler of claim 1 is characterized in that the tail heating surface is the heating surface of a flue gas cooler.
9. The integrated denitration and dedusting biomass grate boiler of claim 1, wherein the dedusting equipment is one of cyclone dedusting, cloth bag dedusting and multi-pipe dedusting.

Description

Denitration and dust removal integrated arrangement biomass grate boiler Technical Field The utility model relates to the technical field of boilers, in particular to a grate type biomass boiler for combusting biomass. Background Biomass boilers, which are important devices for biomass energy utilization and directly burn biomass as fuel, are widely used in the fields of heating, industrial production, power generation and the like. The biomass boiler adopts various fuels with complex components. Compared with the traditional coal-fired boiler, the biomass fuel has higher nitrogen element content, so that nitrogen oxides (NOx for short) pollutants generated by combustion are more than those of the coal-fired boiler, and the nitrogen oxides are key atmospheric pollutants and directly or indirectly cause harm to the environment, buildings, animals, plants and humans, so that flue gas needs to be subjected to denitration treatment before being discharged, the NOx in the gas is reduced, and the safety of the discharged gas is ensured. At present, in the thermal power plant industry, general boiler equipment and environmental protection equipment are two independent plates, the boiler equipment needs to be designed and produced by factories with professional qualification, environmental protection equipment such as denitration, dust removal, desulfurization and the like needs to be matched with the boiler design, the equipment is generally independent of the boiler body and is arranged in a flue behind an outlet flue of the boiler, the equipment is arranged outside a steel frame of the boiler body, the boiler is only considered by the boiler profession in the design of the biomass power plant, the environmental protection profession only considers environmental protection, the two equipment are generally arranged independently and then are connected through the flue, the flue gas is taken out from the boiler body and enters the environmental protection equipment for treatment, the flue gas after the treatment needs to be led into a heating surface at the rear part of the flue gas flow through another flue, the flue gas flow is longer, generally at least more than 30 meters, and the flue gas needs to avoid a boiler steel frame, a diagonal bracing and the like, so that the flue resistance is increased in a plurality of ways, the waste of steel is caused, and the power consumption of a draught fan is increased. Disclosure of Invention The utility model aims to overcome the defects in the prior art and provides a denitration and dust removal integrated biomass grate boiler which is used for solving the problems in the background art. The technical scheme adopted by the utility model for achieving the purpose is as follows: A denitration and dust removal integrated biomass grate boiler comprises a hearth, a second flue, a third flue and a fourth flue, wherein the second flue, the third flue and the fourth flue are sequentially connected with an outlet of the hearth, the second flue, the third flue and the fourth flue are vertically arranged, an inlet of the second flue is connected with the outlet of the hearth, the second flue is communicated with the lower end part of the third flue, and the upper end of the third flue is connected with the upper end of the fourth flue through a furnace top turning flue. Through adopting above-mentioned technical scheme, the flue gas that gets into by the third flue is earlier through dust collecting equipment dust removal, and the flue gas reentrant denitration device reaction after the dust removal avoids denitration device to receive the alkali metal influence in the flying dust, leads to catalyst poisoning inefficacy, has avoided denitration device deposition simultaneously, leads to boiler stop, improves the continuous operation time and the catalyst life of boiler. After the flue gas is dedusted in the boiler, the dust accumulation and low-temperature corrosion of the tail heating surface of the boiler are reduced, the running flue gas resistance is reduced, the service life of the tail heating surface is prolonged, and the running cost is reduced. The high Wen Tuoxiao equipment is arranged in the boiler, so that the ammonia escape concentration of the outlet of the boiler is reduced, the low-temperature corrosion of the tail heating surface due to the fact that the ammonia escape concentration is too high is prevented, and the service life of the tail heating surface is prolonged. In the biomass grate boiler integrally provided with the denitration and dust removal, the dust removal equipment and the denitration equipment are supported on a boiler body steel frame. By adopting the technical scheme, the dust removing equipment and the denitration equipment are also arranged in the range of the boiler body, compared with the prior art, the length of a connecting flue between the boiler and the environmental protection equipment is greatly shortened, the turning of smoke is red