CN211060091U - Biomass energy-saving steam boiler - Google Patents

Abstract

A biomass energy-saving steam boiler comprises a furnace base and a heat-insulating furnace shell, wherein the furnace base is arranged at the bottom of the heat-insulating furnace shell; an upper boiler barrel is arranged at the inner upper part of the heat preservation furnace shell, two sides of the inner lower part are respectively provided with a collecting pipe, and the collecting pipe and the upper boiler barrel penetrate through the front side and the rear side of the heat preservation furnace shell; the collecting pipes on both sides of the inner lower part of the heat preservation furnace shell are respectively communicated with the upper boiler barrel through the membrane water-cooled wall; the front side of the heat preservation furnace shell is provided with a furnace door, and the upper part of the rear side is communicated with a flue gas outlet pipe; the inner front part of the heat preservation furnace shell is a hearth, the lower part of the hearth is provided with a grate and an ash collecting chamber, and the ash collecting chamber is provided with a ventilating pipe orifice; a retaining wall is arranged at the rear end of the hearth; a blocking cover is arranged above the rear half side of the hearth; a blocking wall is arranged above the blocking cover; a lower boiler barrel is arranged at the inner rear lower part of the heat preservation furnace shell; two sides of the lower boiler barrel are respectively communicated with the collecting pipe through the transverse communicating pipe; and a three-surface partition wall is arranged between the lower boiler barrel and the upper boiler barrel, and the three-surface partition wall forms a left-right circulating three-return flue gas channel. The boiler has high combustion efficiency and can discharge tail gas up to the standard.

Description

Biomass energy-saving steam boiler

Technical Field

The utility model relates to a technical field of boiler specifically is an energy-conserving steam boiler of living beings.

Background

With the rapid development of national economy, the energy crisis and environmental pollution problems in China are increasingly prominent, the quantity of energy resources owned by everyone is at a lower level in the world, the energy supply is increasingly tense, and the large-scale development and utilization of fossil energy, particularly coal, seriously affects the ecological environment. Biomass energy is an ideal renewable energy source, has wide sources and great utilization potential. Cogeneration of biomass is an important way of biomass utilization. Biomass fuel: the biomass material is burnt to be used as fuel, and is mainly agricultural and forestry waste (such as straw, sawdust, bagasse, rice chaff and the like). Mainly distinguished from fossil fuels. In the current national policy and environmental protection standard, the direct combustion biomass belongs to a high-pollution fuel, is only used in a rural large stove and is not allowed to be used in a city. Application of biomass fuel, in fact, biomass briquette fuel (BiomassMouldingFuel"BMF" for short) is a new type clean fuel which is made up by using agricultural and forestry wastes as raw material through the processes of pulverizing, mixing, extruding and drying, etc. and can be made into various forms (such as block form, granular form, etc.) and can be directly combusted.

In recent years, the duration of haze weather in China is continuously prolonged, the main factors influencing the haze weather are power plants, automobile tail gas and industrial smoke dust, and nitrogen oxides and the smoke dust are the main factors for forming haze. Most of the currently applied biomass steam boilers have the problem of substandard tail gas emission during combustion.

Disclosure of Invention

The utility model aims at providing a biomass energy-saving steam boiler that combustion efficiency is high, tail gas can discharge to reach standard.

In order to realize the purpose of the utility model, the technical scheme who takes is:

a biomass energy-saving steam boiler comprises a furnace base and a heat-insulating furnace shell, wherein the furnace base is arranged at the bottom of the heat-insulating furnace shell; an upper boiler barrel is arranged at the inner upper part of the heat preservation furnace shell, two sides of the inner lower part are respectively provided with a collecting pipe, and the collecting pipe and the upper boiler barrel penetrate through the front side and the rear side of the heat preservation furnace shell; the upper drum is provided with a steam detection and output assembly, and the steam detection and output assembly comprises a steam pressure gauge, an output pipe, a pressure release valve, a steam-water separator, a dosing device and the like; the collecting pipes on both sides of the inner lower part of the heat preservation furnace shell are respectively communicated with the upper boiler barrel through the membrane water-cooled wall; the two sides of the boiler are all in membrane type wall structures, so that the conditions of smoke leakage, air leakage and the like caused by damage of boiler walls are avoided, and the combustion condition and the operation condition of the boiler are better. The front side of the heat preservation furnace shell is provided with a furnace door, and the upper part of the rear side is communicated with a flue gas outlet pipe; the inner front part of the heat preservation furnace shell is a hearth, the lower part of the hearth is provided with a fire grate, the lower part of the fire grate is an ash collection chamber, and the ash collection chamber is provided with a ventilating pipe orifice; a retaining wall is arranged at the rear end of the hearth, the retaining wall is not connected with the upper boiler barrel, and a flue gas passageway is reserved; a baffle cover is arranged above the rear half side of the hearth, the left side and the right side of the baffle cover are connected with the membrane water-cooled wall, and the rear side of the baffle cover is connected with the retaining wall; a resistance wall is arranged above the blocking cover, the top of the resistance wall is connected with the upper boiler barrel, the right side of the resistance wall is connected with the membrane water-cooled wall on the right side, and the left side of the resistance wall is not connected with the membrane water-cooled wall on the left side; a lower boiler barrel is arranged at the inner rear lower part of the heat preservation furnace shell; two sides of the lower boiler barrel are respectively communicated with the collecting pipes at two sides through a plurality of transverse communicating pipes; a three-surface partition wall is arranged between the lower boiler barrel and the upper boiler barrel, and the space between the lower boiler barrel and the upper boiler barrel is enclosed into a left-right circulating three-return flue gas channel by the three-surface partition wall. The tail gas after the biomass fuel is combusted passes through the left side of the blocking wall above the blocking cover, then passes through the three-return flue gas channel from the upper part of the blocking wall, and finally is discharged from the flue gas outlet pipe. The air supply device sends cold air into the air preheater by a blower, and the preheated air enters the ash collecting chamber from the left side of the boiler through 4 small air channels with equal cross sections, namely, air vents, respectively, and finally enters the hearth through the grate. The 4 small air channels are respectively provided with an air adjusting device which can respectively adjust the air output so as to meet the air output requirements of different stages in the combustion process.

The front half part of the left side of the hearth is communicated with a secondary oxygen supply pipe, and the position of the secondary oxygen supply pipe is flush with the front end of the blocking cover. The secondary oxygen supply pipe supplies oxygen required by the combustion of volatile matters in the flue gas to strengthen disturbance, and secondary air is directly introduced into the hearth from the main air channel by a pipeline so as to increase the disturbance of fuel volatile matters and enable the fuel to be more fully combusted.

And a plurality of convection pipes for communicating the upper boiler barrel with the lower boiler barrel are arranged on two sides of the partition wall and in the three-return flue gas channel.

The convection tubes are hollow square column-shaped in the channel between the two partition walls, and the distance between every two adjacent convection tubes is equal. When tail gas passes through the first passageway that advances three return stroke flue gas passageways from the upper portion of barricade, carry out the heat transfer back with the convection current pipe of one side earlier, reentrant square column's hollow position carries out the heat transfer with convection current pipe on every side, pass through from the clearance between the convection current pipe of opposite side again, enter into the second passageway, carry out the heat transfer once more, arrange the convection current pipe in the passageway according to hollow square column, can increase heat transfer area, avoid the flue gas to receive too much hindrance again, cause the circulation unsmooth to influence the fuel burning in the furnace.

And two ends of the upper boiler barrel are respectively connected with two ends of the collecting pipes on two sides through the bearing steel plates, so that the supporting connection between the upper boiler barrel and the collecting pipes is enhanced.

The front end of the collecting pipe is also communicated with the front end of the upper boiler barrel through a vertical communicating pipe, and the communication between the collecting pipe and the upper boiler barrel is enhanced.

The coal economizer is arranged on the flue gas outlet pipe and is also connected with the upper boiler through a water supply pipe. The biomass energy-saving steam boiler adopts a fixed grate and is also provided with a corresponding platform staircase, a pipeline, a valve and an instrument according to the operation and safety requirements. The main auxiliary machine comprises a deaerator, a blower, a draught fan, a feed water pump and the like, and the deaerator is used for feeding feed water into the coal economizer after the feed water is deaerated. The coal economizer adopts the arrangement mode of the spiral finned tubes in the same row and consists of a plurality of spiral finned tubes which are arranged in the transverse direction and in the longitudinal row. And carrying out corresponding hydrostatic test before leaving the factory to ensure that the working medium is not leaked. The upper flue of the economizer is provided with an inspection hole, so that the overhaul and the ash removal are convenient.

A ladder stand is arranged on the outer side of the heat preservation furnace shell.

And the bottom parts of the collecting pipe, the upper boiler barrel and the lower boiler barrel are provided with sewage outlets.

And a side furnace door is arranged on the side surface of the hearth. The left and right sides of the hearth are provided with side furnace doors, so that the ignition condition can be checked, and the daily fire poking and coke striking operation and the maintenance after the furnace is shut down can be carried out in the hearth.

The boiler is a double-drum longitudinally-arranged fixed grate water pipe boiler designed according to fuels such as biomass particles, is suitable for the fuels being biomass particles, and has the received base water Mar of less than or equal to 10 percent.

The biomass energy-saving steam boiler has the advantages that:

1. the furnace setting of this boiler is anterior in the holding furnace shell, furnace is by both sides diaphragm type wall, the barricade, keep off cladding such as cover and grate face and form, it hinders the wall to have arranged one in the middle of keeping off the cover, divide into two parts with furnace, the front portion is main combustion area, keep off the cover can effectual tissue burning, it is the burn-out room to hinder the wall rear portion, provide sufficient space for the burning of fuel, overgrate air has still been arranged in the boiler left side in addition, overgrate air is direct to introduce furnace by the pipeline from total wind channel, with the disturbance that increases fuel volatiles, it is more abundant to make the fuel burning, make tail gas discharge up to standard.

2. The boiler is a double-drum longitudinally-arranged fixed grate water pipe boiler designed according to fuels such as biomass particles and the like, is suitable for the fuels being biomass particles, is provided with a three-return flue gas channel, is internally provided with a plurality of convection pipes for communicating an upper drum with a lower drum, is provided with a sufficient heating surface, fully utilizes tail gas heat, has the advantages of fast steam production and sufficient steam quantity, and can completely meet the requirements of steam for production and living of enterprises.

Drawings

FIG. 1 is a schematic structural diagram of the biomass energy-saving steam boiler;

FIG. 2 is a schematic view taken from the direction A-A of FIG. 1;

FIG. 3 is a schematic diagram of the steam generating system of FIG. 1;

FIG. 4 is a schematic view of FIG. 3 taken along line B-B;

FIG. 5 is a left side view of FIG. 3;

the part names of the sequence numbers in the figure are:

1. the boiler comprises a boiler base, 2, a ventilating pipe orifice, 3, a collecting pipe, 4, an ash collecting chamber, 5, a boiler door, 6, a fire grate, 7, a heat preservation furnace shell, 8, a hearth, 9, a secondary oxygen supply pipe, 10, a retaining wall, 11, a retaining cover, 12, a retaining wall, 13, an upper boiler barrel, 14, a steam detection and output assembly, 15, a convection pipe, 16, a partition wall, 17, a transverse communicating pipe, 18, a lower boiler barrel, 19, a ladder stand, 20, a flue gas outlet pipe, 21, a coal economizer, 22, a vertical communicating pipe, 23, a membrane water-cooling wall, 24, a side boiler door, 25 and a bearing steel plate.

Detailed Description

For a more clear description of the present technology, the present technology is further described in detail below with reference to the accompanying drawings and examples.

Example 1

A biomass energy-saving steam boiler comprises a furnace base 1 and a heat-insulating furnace shell 7, wherein the furnace base 1 is arranged at the bottom of the heat-insulating furnace shell 7; an upper boiler barrel 13 is arranged at the inner upper part of the heat preservation furnace shell 7, the two sides of the inner lower part are respectively provided with a collecting pipe 3, and the collecting pipe 3 and the upper boiler barrel 13 both penetrate through the front side and the rear side of the heat preservation furnace shell 7; the upper drum 13 is provided with a steam detection and output assembly 14, and the steam detection and output assembly 14 comprises a steam pressure gauge, an output pipe, a pressure release valve, a steam-water separator, a dosing device and the like; the collecting pipes 3 on both sides of the inner lower part of the heat preservation furnace shell 7 are respectively communicated with the upper boiler barrel 13 through a membrane type water-cooled wall 23; the front side of the heat preservation furnace shell 7 is provided with a furnace door 5, and the upper part of the rear side is communicated with a flue gas outlet pipe 20; the inner front part of the heat preservation furnace shell 7 is a hearth 8, the lower part of the hearth 8 is provided with a fire grate 6, the lower part of the fire grate 6 is provided with an ash collection chamber 4, and the ash collection chamber 4 is provided with a ventilating pipe orifice 2; a retaining wall 10 is arranged at the rear end of the hearth 8, the retaining wall 10 is not connected with the upper boiler barrel 13, and a flue gas passageway is reserved; a baffle cover 11 is arranged above the rear half side of the hearth 8, the left side and the right side of the baffle cover 11 are connected with a membrane water-cooled wall 23, and the rear side of the baffle cover 11 is connected with a retaining wall 10; a resistance wall 12 is arranged above the blocking cover 11, the top of the resistance wall 12 is connected with the upper boiler 13, the right side of the resistance wall 12 is connected with the membrane water-cooled wall 23 on the right side, and the left side of the resistance wall 12 is not connected with the membrane water-cooled wall 23 on the left side; the front half part of the left side of the hearth 8 is communicated with a secondary oxygen supply pipe 9, and the position of the secondary oxygen supply pipe 9 is flush with the front end of the blocking cover 11. A lower boiler barrel 18 is arranged at the inner rear lower part of the heat preservation furnace shell 7; two sides of the lower boiler barrel 18 are respectively communicated with the collecting pipes 3 at two sides through a plurality of transverse communicating pipes 17; a three-surface partition wall 16 is arranged between the lower boiler barrel 18 and the upper boiler barrel 13, and the three-surface partition wall 16 enables the space between the lower boiler barrel 18 and the upper boiler barrel 13 to form a left-right circulating three-return flue gas channel.

Example 2

A biomass energy-saving steam boiler comprises a furnace base 1 and a heat-insulating furnace shell 7, wherein the furnace base 1 is arranged at the bottom of the heat-insulating furnace shell 7; an upper boiler barrel 13 is arranged at the inner upper part of the heat preservation furnace shell 7, the two sides of the inner lower part are respectively provided with a collecting pipe 3, and the collecting pipe 3 and the upper boiler barrel 13 both penetrate through the front side and the rear side of the heat preservation furnace shell 7; the upper drum 13 is provided with a steam detection and output assembly 14, and the steam detection and output assembly 14 comprises a steam pressure gauge, an output pipe, a pressure release valve, a steam-water separator, a dosing device and the like; the collecting pipes 3 on both sides of the inner lower part of the heat preservation furnace shell 7 are respectively communicated with the upper boiler barrel 13 through a membrane type water-cooled wall 23; the two ends of the upper boiler barrel 13 are also respectively connected with the two ends of the collecting pipes 3 at the two sides through the bearing steel plates 25. The front side of the heat preservation furnace shell 7 is provided with a furnace door 5, and the upper part of the rear side is communicated with a flue gas outlet pipe 20; the inner front part of the heat preservation furnace shell 7 is a hearth 8, the lower part of the hearth 8 is provided with a fire grate 6, the lower part of the fire grate 6 is provided with an ash collection chamber 4, and the ash collection chamber 4 is provided with a ventilating pipe orifice 2; a retaining wall 10 is arranged at the rear end of the hearth 8, the retaining wall 10 is not connected with the upper boiler barrel 13, and a flue gas passageway is reserved; a baffle cover 11 is arranged above the rear half side of the hearth 8, the left side and the right side of the baffle cover 11 are connected with a membrane water-cooled wall 23, and the rear side of the baffle cover 11 is connected with a retaining wall 10; a resistance wall 12 is arranged above the blocking cover 11, the top of the resistance wall 12 is connected with the upper boiler 13, the right side of the resistance wall 12 is connected with the membrane water-cooled wall 23 on the right side, and the left side of the resistance wall 12 is not connected with the membrane water-cooled wall 23 on the left side; the front half part of the left side of the hearth 8 is communicated with a secondary oxygen supply pipe 9, and the position of the secondary oxygen supply pipe 9 is flush with the front end of the blocking cover 11. A lower boiler barrel 18 is arranged at the inner rear lower part of the heat preservation furnace shell 7; two sides of the lower boiler barrel 18 are respectively communicated with the collecting pipes 3 at two sides through a plurality of transverse communicating pipes 17; a three-surface partition wall 16 is arranged between the lower boiler barrel 18 and the upper boiler barrel 13, and the three-surface partition wall 16 enables the space between the lower boiler barrel 18 and the upper boiler barrel 13 to form a left-right circulating three-return flue gas channel.

And a plurality of convection pipes 15 for communicating the upper drum 13 with the lower drum 18 are arranged on two sides of the partition wall 16 and in the three-return flue gas channel. The convection tubes 15 are hollow square columns in the channel between the two partition walls 16, and the distance between every two adjacent convection tubes 15 is equal.

The front end of the collecting pipe 3 is also communicated with the front end of the upper boiler 13 through a vertical communicating pipe 22.

The flue gas outlet pipe 20 is provided with an economizer 21, and the economizer 21 is also connected with the upper drum 13 through a water supply pipe. The biomass energy-saving steam boiler adopts a fixed grate and is also provided with a corresponding platform staircase, a pipeline, a valve and an instrument according to the operation and safety requirements. The main auxiliary machine comprises a deaerator, a blower, a draught fan, a feed water pump and the like, and the deaerator is used for feeding feed water into the coal economizer after the feed water is deaerated. The coal economizer adopts an arrangement mode of arranging spiral finned tubes in an in-line mode, and is formed by a plurality of 1400mm spiral finned tubes in 10 rows in the transverse direction and 14 rows in the longitudinal direction. And carrying out corresponding hydrostatic test before leaving the factory to ensure that the working medium is not leaked. The upper flue of the economizer is provided with an inspection hole, so that the overhaul and the ash removal are convenient.

A ladder stand 19 is arranged on the outer side of the heat preservation furnace shell 7.

The bottom of the collecting pipe 3, the upper boiler barrel 13 and the lower boiler barrel 18 are all provided with sewage outlets.

And a side furnace door 24 is arranged on the side surface of the hearth 8. 3 side furnace doors 24 are arranged on the left side and the right side of the hearth 8, so that the ignition condition can be checked, and the daily fire poking, coke striking operation and furnace shutdown are carried out and then the furnace enters the hearth for overhauling.

The above description is not intended to limit the present application, and the present application is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present application.

Claims (10)

1. A biomass energy-saving steam boiler comprises a furnace base (1) and a heat-insulating furnace shell (7), wherein the furnace base (1) is arranged at the bottom of the heat-insulating furnace shell (7); an upper boiler barrel (13) is arranged at the inner upper part of the heat-insulating furnace shell (7), the two sides of the inner lower part are respectively provided with a collecting pipe (3), and the collecting pipe (3) and the upper boiler barrel (13) penetrate through the front side and the rear side of the heat-insulating furnace shell (7); the upper boiler barrel (13) is provided with a steam detection and output assembly (14); the collecting pipes (3) at the two sides of the inner lower part of the heat preservation furnace shell (7) are respectively communicated with the upper boiler barrel (13) through a membrane water-cooled wall (23); the front side of the heat preservation furnace shell (7) is provided with a furnace door (5), and the upper part of the rear side is communicated with a flue gas outlet pipe (20); the inner front part of the heat preservation furnace shell (7) is provided with a hearth (8), the lower part of the hearth (8) is provided with a fire grate (6), the lower part of the fire grate (6) is provided with an ash collection chamber (4), and the ash collection chamber (4) is provided with a ventilating pipe orifice (2); the method is characterized in that: a retaining wall (10) is arranged at the rear end of the hearth (8), the retaining wall (10) is not connected with the upper boiler barrel (13), and a flue gas passageway is reserved; a blocking cover (11) is arranged above the rear half side of the hearth (8), the left side and the right side of the blocking cover (11) are connected with the membrane water-cooled wall (23), and the rear side of the blocking cover (11) is connected with the retaining wall (10); a resistance wall (12) is arranged above the blocking cover (11), the top of the resistance wall (12) is connected with the upper drum (13), the right side of the resistance wall (12) is connected with the membrane water-cooling wall (23) on the right side, and the left side of the resistance wall (12) is not connected with the membrane water-cooling wall (23) on the left side; a lower boiler barrel (18) is arranged at the inner rear lower part of the heat preservation furnace shell (7); two sides of the lower boiler barrel (18) are respectively communicated with the collecting pipes (3) at two sides through a plurality of transverse communicating pipes (17); three partition walls (16) are arranged between the lower boiler barrel (18) and the upper boiler barrel (13), and the space between the lower boiler barrel (18) and the upper boiler barrel (13) is surrounded by the three partition walls (16) to form a three-return flue gas channel which circulates left and right.

2. A biomass energy-saving steam boiler according to claim 1, characterized in that: the front half part of the left side of the hearth (8) is communicated with a secondary oxygen supply pipe (9), and the position of the secondary oxygen supply pipe (9) is flush with the front end of the blocking cover (11).

3. A biomass energy-saving steam boiler according to claim 1, characterized in that: and a plurality of convection pipes (15) which are used for communicating the upper boiler barrel (13) with the lower boiler barrel (18) are arranged on two sides of the partition wall (16) and in the three-return flue gas channel.

4. A biomass energy-saving steam boiler according to claim 3, characterized in that: the convection tubes (15) are hollow square columns in the channel between the two partition walls (16), and the distance between every two adjacent convection tubes (15) is equal.

5. A biomass energy-saving steam boiler according to claim 1, characterized in that: and two ends of the upper boiler barrel (13) are also respectively connected with two ends of the collecting pipes (3) at two sides through a bearing steel plate (25).

6. A biomass energy-saving steam boiler according to claim 1, characterized in that: the front end of the collecting pipe (3) is also communicated with the front end of the upper boiler barrel (13) through a vertical communicating pipe (22).

7. A biomass energy-saving steam boiler according to claim 1, characterized in that: the coal economizer (21) is installed on the flue gas outlet pipe (20), and the coal economizer (21) is further connected with the upper boiler barrel (13) through a water supply pipe.

8. A biomass energy-saving steam boiler according to claim 1, characterized in that: a ladder (19) is arranged on the outer side of the heat preservation furnace shell (7).

9. A biomass energy-saving steam boiler according to claim 1, characterized in that: and the bottoms of the collecting pipe (3), the upper boiler barrel (13) and the lower boiler barrel (18) are provided with sewage outlets.

10. A biomass energy-saving steam boiler according to claim 1, characterized in that: and a side furnace door (24) is arranged on the side surface of the hearth (8).

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