CN219607041U - Industrial steam boiler for fine pulverized coal combustion - Google Patents

Abstract

The utility model relates to a fine pulverized coal combustion industrial steam boiler, which comprises a boiler barrel, a hearth, a flue, a slag discharging port and a fine pulverized coal burner, and is technically characterized in that: the number of the fine coal powder burners is multiple and the fine coal powder burners are uniformly distributed around the central line of the furnace barrel, the fine coal powder burners are obliquely inserted into the lower part of the furnace chamber from top to bottom, the fine coal powder burners comprise a primary air pipe, a concentric coal powder spray pipe and a concentric secondary air barrel, a spiral sleeve is arranged on the outer wall of the lower part of the concentric coal powder spray pipe, a spiral outlet space is formed between the spiral sleeve and the lower end of the primary air pipe, an upper seal head of the primary air pipe is led out from the upper end of the concentric coal powder spray pipe, an upper seal plate is arranged between the upper end of the concentric secondary air barrel and the outer wall of the primary air pipe, and the lower end of the concentric secondary air barrel surrounds the outer side of the lower end of the primary air pipe. The utility model solves the problem that most of unburned pulverized coal overflows along with flue gas in the existing fine pulverized coal combustion industrial steam boiler, ensures that the pulverized coal is fully combusted in a hearth, reduces the flue gas treatment difficulty and reduces the energy waste.

Description

Industrial steam boiler for fine pulverized coal combustion

Technical Field

The utility model relates to a boiler, in particular to a fine pulverized coal combustion industrial steam boiler.

Background

Industrial steam boilers refer to industrial boilers which heat water to certain parameters and produce high-temperature steam, heat is generated in a hearth by fire, and the water is heated in a boiler barrel to become steam, which is the principle of the steam boilers. The fine coal powder is pulverized into coal powder with the grain size of 9-37 microns by high-pressure airflow, and is sent into a hearth by a coal powder burner, and is burnt in the hearth under the auxiliary suspension state by an air distribution device, and is used as a heat source of an industrial steam boiler. The pulverized coal furnace has less application in industrial boilers, and the pulverized coal can only stay in a hearth for about 2 seconds, so that the pulverized coal is required to be ground finely for being burnt out in the furnace, and the early-stage coal grinding cost is high. And the boiler furnace needs to have enough volume, the pulverized coal can be fully combusted, and the pulverized coal which cannot be fully combusted can increase the flue gas treatment difficulty.

CN202973047U discloses an industrial steam boiler with fine pulverized coal combustion, during operation, two burners are respectively arranged on the side wall of the boiler, pulverized coal burns in the hearth, and the flame folding wall can enable the flame in the hearth to turn once so as to prolong the burning time of the pulverized coal in the hearth, so that the burning rate of the pulverized coal is improved to a certain extent. But it still has the following problems during operation: because of the limitation of the position of the flame folding wall, the pulverized coal interception has a larger blind area, so that most of unburned pulverized coal enters a flue gas treatment system along with flue gas, and energy waste is caused.

Disclosure of Invention

The utility model aims to provide the fine pulverized coal combustion industrial steam boiler which is reasonable in structure and reliable in use, solves the problem that most of unburnt pulverized coal overflows along with flue gas in the existing fine pulverized coal combustion industrial steam boiler, ensures that the pulverized coal is fully combusted in a hearth, reduces the flue gas treatment difficulty and reduces the energy waste.

The technical scheme of the utility model is as follows:

the utility model provides a meticulous buggy burning industrial steam boiler, includes the stove section of thick bamboo that has the water jacket, locates furnace in the stove section of thick bamboo, the flue of being connected with the furnace top, the slag tap of being connected with the furnace bottom, inserts meticulous buggy combustor in the furnace, its technical essential is: the utility model provides a boiler furnace is characterized by comprising a furnace cylinder, a furnace, a fine pulverized coal burner, a plurality of fine pulverized coal burners, a plurality of baffle plates, a plurality of air inlet pipelines, an upper seal head of the primary air pipe is led out from the upper end of the concentric pulverized coal burner, a spray head is arranged at the lower end of the concentric pulverized coal burner, an upper seal plate is arranged at the lower end of the concentric pulverized coal burner, a secondary air inlet pipeline is arranged on the upper seal plate, the lower end of the concentric secondary air pipe surrounds the outer side of the lower end of the primary air pipe, and an S-shaped flue gas channel is formed by the baffle plates.

According to the industrial steam boiler for burning fine coal powder, the concentric secondary air cylinder is a venturi cylinder, negative pressure is generated when the lower end of the primary air pipe burns, air inlet of the concentric secondary air cylinder is facilitated, and resistance is reduced.

In the fine pulverized coal combustion industrial steam boiler, the included angle between the central line of the primary air pipe and the central line of the boiler barrel is 45 degrees.

The fine pulverized coal combustion industrial steam boiler is characterized in that an upper economizer and a lower economizer are arranged in the flue, inlets of the upper economizer and the lower economizer are connected with water supplementing pipelines, outlet pipelines of the upper economizer and the lower economizer are respectively connected with the lower part of the water jacket, and a steam outlet pipeline is arranged at the top of the water jacket.

The primary air inlet pipeline of each fine coal powder burner is connected by using the first annular air distribution pipeline, the first annular air distribution pipeline is provided with a primary air inlet, the secondary air inlet pipeline of each fine coal powder burner is connected by using the second annular air distribution pipeline, and the second annular air distribution pipeline is provided with a secondary air inlet.

According to the fine pulverized coal combustion industrial steam boiler, the secondary air inlet pipeline is provided with the flame arrester.

The beneficial effects of the utility model are as follows:

1. the fine coal powder burners obliquely inserted into the lower part of the hearth prolong the ascending stroke of coal powder sprayed into the hearth, so that the combustion time is prolonged, and meanwhile, the coal powder sprayed from the concentric coal powder spray pipes of the fine coal powder burners is fully mixed with primary air flow sprayed from the spiral, so that the combustion efficiency is improved. Solves the problem that most of unburnt pulverized coal overflows along with flue gas in the existing fine pulverized coal combustion industrial steam boiler, ensures that the pulverized coal is fully combusted in a hearth, reduces the flue gas treatment difficulty and reduces the energy waste.

2. The concentric secondary air cylinder is adopted to assist air, the lower end of the concentric secondary air cylinder surrounds the outer side of the lower end of the primary air pipe, and the combustion efficiency is further improved.

3. Because the upper part of the hearth is provided with a plurality of baffles and the baffles are used for forming the S-shaped flue gas channel, the heat exchange area is conveniently increased, and on the other hand, an ash blocking structure is formed, so that the overflow amount of coal ash is reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a schematic structural view of the fine coal burner of the present utility model.

In the figure: 1. the boiler comprises a steam outlet pipeline, a boiler barrel, a flue, an upper economizer, a water supplementing pipeline, a lower economizer, a baffle, a water jacket, a second annular air distribution pipeline, a first annular air distribution pipeline, a concentric secondary air barrel, a slag discharging port, a secondary air inlet, a primary air inlet, an inlet, a fire arrestor, a secondary air inlet pipeline, a primary air inlet pipeline, a concentric pulverized coal spray pipe, a primary air pipe, a spiral sleeve and a spray nozzle.

Description of the embodiments

The utility model will be described in detail with reference to the drawings.

As shown in fig. 1 and 2, the industrial steam boiler for burning fine coal powder comprises a furnace 2 with a water jacket 8, a hearth arranged in the furnace 2, a flue 3 connected with the top of the hearth, a slag discharging port 12 connected with the bottom of the hearth and a fine coal powder burner inserted into the hearth.

Wherein the number of the fine coal burners is plural and uniformly arranged around the center line of the furnace 2. The fine coal burner is inserted into the lower part of the hearth from top to bottom in an inclined way and comprises a primary air pipe 20, a concentric coal powder spray pipe 19 arranged in the primary air pipe 20 and a concentric secondary air cylinder 11 arranged outside the primary air pipe 20. The lower outer wall of the concentric pulverized coal spray pipe 19 is provided with a spiral sleeve 21, and a spiral outlet space is formed between the spiral sleeve 21 and the lower end of the primary air pipe 20. The upper end of the primary air pipe 20 is provided with a primary air inlet pipeline 18, an upper end inlet 15 of the concentric pulverized coal spray pipe 19 is led out of an upper end enclosure of the primary air pipe 20, a spray head 22 is arranged at the lower end of the concentric pulverized coal spray pipe 19, two spray holes are symmetrically arranged on the spray head 22, an upper sealing plate is arranged between the upper end of the concentric secondary air cylinder 11 and the outer wall of the primary air pipe 20, a secondary air inlet pipeline 17 is arranged on the upper sealing plate, and the lower end of the concentric secondary air cylinder 11 is surrounded on the outer side of the lower end of the primary air pipe 20. The upper part of the hearth is provided with a plurality of baffles 7 and S-shaped flue gas channels are formed by the baffles 7.

In this embodiment, the included angle between the center line of the primary air duct 20 and the center line of the furnace cylinder 2 is 45 degrees. The concentric secondary air cylinder 11 is a venturi cylinder, and negative pressure is generated when the lower end of the primary air pipe 20 burns, so that air intake of the concentric secondary air cylinder 11 is facilitated, and resistance is reduced. And a flame arrester 16 is arranged on the secondary air inlet pipeline 17. The primary air inlet pipelines 18 of all fine coal powder burners are connected by using a first annular air distribution pipeline 10, primary air inlets 14 are formed in the first annular air distribution pipeline 10, the secondary air inlet pipelines 17 of all fine coal powder burners are connected by using a second annular air distribution pipeline 9, and secondary air inlets 13 are formed in the second annular air distribution pipeline 9. A supporting rib is arranged between the primary air pipe 20 and the concentric pulverized coal spray pipe 19, and a supporting rib is arranged between the concentric secondary air cylinder 11 and the primary air pipe 20.

An upper economizer 4 and a lower economizer 6 are arranged in the flue 3, inlets of the upper and lower economizers are connected with a water supplementing pipeline 5, outlet pipelines of the upper and lower economizers are respectively connected with the lower part of a water jacket 8, and a steam outlet pipeline 1 is arranged at the top of the water jacket 8.

Working principle:

when the pulverized coal burner is used, pulverized coal is sprayed into a hearth through the concentric pulverized coal spray pipe 19, meanwhile, primary air is sprayed out in a spiral mode through the primary air pipe 20 and the spiral outlet space and is mixed with the pulverized coal to form spiral mixed flow, the mixed flow is fully combusted after ignition, secondary air has a combustion supporting effect, and combustion time is prolonged by prolonging the upward time of the pulverized coal, so that combustion efficiency is improved.

The foregoing describes the embodiments of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to fall within the scope of the present utility model.

Claims (6)

1. The utility model provides a meticulous buggy burning industrial steam boiler, includes the stove section of thick bamboo that has the water jacket, locates the furnace in the stove section of thick bamboo, the flue of being connected with the furnace top, the slag tap of being connected with the furnace bottom, inserts meticulous buggy combustor in the furnace, its characterized in that: the utility model provides a boiler furnace is characterized by comprising a furnace cylinder, a furnace, a fine pulverized coal burner, a plurality of fine pulverized coal burners, a plurality of baffle plates, a plurality of air inlet pipelines, an upper seal head of the primary air pipe is led out from the upper end of the concentric pulverized coal burner, a spray head is arranged at the lower end of the concentric pulverized coal burner, an upper seal plate is arranged at the lower end of the concentric pulverized coal burner, a secondary air inlet pipeline is arranged on the upper seal plate, the lower end of the concentric secondary air pipe surrounds the outer side of the lower end of the primary air pipe, and an S-shaped flue gas channel is formed by the baffle plates.

2. The fine coal combustion industrial steam boiler according to claim 1, wherein: the concentric secondary air cylinder is a venturi cylinder.

3. The fine coal combustion industrial steam boiler according to claim 1, wherein: the included angle between the central line of the primary air pipe and the central line of the furnace cylinder is 45 degrees.

4. The fine coal combustion industrial steam boiler according to claim 1, wherein: the flue is internally provided with an upper economizer and a lower economizer, inlets of the upper and lower economizers are connected with water supplementing pipelines, outlet pipelines of the upper and lower economizers are respectively connected with the lower part of the water jacket, and the top of the water jacket is provided with a steam outlet pipeline.

5. The fine coal combustion industrial steam boiler according to claim 1, wherein: the primary air inlet pipeline of each fine coal powder burner is connected by using a first annular air distribution pipeline, a primary air inlet is arranged on the first annular air distribution pipeline, the secondary air inlet pipeline of each fine coal powder burner is connected by using a second annular air distribution pipeline, and a secondary air inlet is arranged on the second annular air distribution pipeline.

6. The fine coal combustion industrial steam boiler according to claim 1, wherein: and a flame arrester is arranged on the secondary air inlet pipeline.