CN218410282U

CN218410282U - Double-layer straw vertical-exhaust smoke direct-combustion boiler

Info

Publication number: CN218410282U
Application number: CN202123359275.9U
Authority: CN
Inventors: 李野
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2023-01-31
Anticipated expiration: 2031-12-28

Abstract

The utility model discloses a double-deck straw vertical flue gas direct combustion boiler, include the boiler body and build by laying bricks or stones in this external brickwork of boiler, be equipped with the chain grate and the water pipe grate that are used for supporting and burning straw bale from top to bottom in the bottom of boiler body in proper order, this internal water piping system and the blast system that still is equipped with respectively of boiler, water piping system is including setting up this internal boiler section of thick bamboo of boiler, water-cooling nest of tubes and lower water-cooling nest of tubes in proper order, the boiler section of thick bamboo is connected between water-cooling nest of tubes and lower water-cooling nest of tubes, still include upper smoke box and lower floor's smoke box, be connected with the many tobacco pipes of vertical arranging between upper smoke box and the lower floor's smoke box. The utility model discloses, adopt the mixed fuel that burning was smashed straw/biomass fuel/smashed straw and biomass fuel on the traveling grate stoker to and the double-deck combustion mode of packing straw on the water pipe grate, make the burning of packing straw on the water pipe grate more thorough, the lime-ash is loose, and coking is not solved the too much problem of water content of packing straw.

Description

Double-layer straw vertical-exhaust smoke direct-combustion boiler

Technical Field

The utility model relates to a clean combustion apparatus, concretely relates to double-deck straw vertical flue gas direct combustion boiler.

Background

As is well known, the annual crop straw production in China is about 7.5 hundred million tons, and the comprehensive utilization rate is low. Besides being used in paper making, feed processing and biogas industry, most straws are directly burnt to generate haze to cause atmospheric pollution.

In fact, the crop straws belong to renewable clean fuel, the content of nitrogen and sulfur is far lower than that of coal, and the heat value of each 1.5 ton of straws is equivalent to that of 1 ton of standard coal. After combustion, the emission of carbon dioxide belongs to the carbon cycle of the nature, and no pollution is formed. At present, in order to realize clean combustion of straws, the straws are secondarily processed into massive or granular fuel in the market, and the fuel is widely applied to production and life. However, the development of the existing straw boiler has certain defects, and the existing straw boiler has the following specific points:

1. fuel state

(1) The straw power generation boiler belongs to a large-capacity boiler, if the straw is crushed and then fed into the boiler for combustion, a lot of auxiliary equipment is needed to be installed, the flow is complex, and a huge stock site and high transportation cost are needed;

(2) When a straw briquette fuel processing plant is built to produce block or granular fuel, more equipment, fields and processing expenses are required to be added, and the operating cost is increased.

2. Combustion mode

(1) Combustion equipment generally adopts two forms of a fixed grate and a rotary grate, and has the common characteristic that the boiler has small capacity, generally below 4 tons/hour, and ash slag of a fire bed is easy to harden and not easy to clean at high temperature, so that the boiler is difficult to operate;

(2) Although the existing packed straw direct-fired boiler is improved in the aspect of boiler air distribution, for example, 1.2-by-1.25 large round bales still enter a hearth and still die into a dead mass, cannot be immediately dispersed, are not completely combusted, and have a small amount of residual fuel in ash, thereby affecting the calorific value.

3. Weather effects

(1) Rapidly cooling and packaging the outside of the straw to ice after raining;

(2) The straw growing under the influence of typhoon falls down aslant, and the accompanying rain causes the straw to be soaked in water for too long time, so that the water content of the harvested straw is too high, and the packed straw cannot be fully combusted due to the influence;

(3) The smoke dust discharged after the straw is burnt has an excessively high loss speed to the smoke pipe.

Obviously, the existing straw boiler has the following defects:

1. the capacity of the boiler is bipolar, and large and medium-sized industrial and civil boiler products are lacked;

2. the ash and slag hardening of the fire grate is serious, and ash and scale are hung on the heating surface;

3. the briquettes or particles have higher density, are not easy to burn through, and have large heat energy loss of the fuel;

4. the packed straw can not be scattered and fully combusted as soon as possible after directly entering the hearth, and is easy to coke.

5. Due to weather influence, the straw can not be fully combusted due to overhigh water content

In view of the above, there is a need to design a new type of straw boiler, which can achieve the purpose of clean combustion and full burn-off, and has no coking and less ash residue.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the design of the existing straw boiler is unreasonable, the cost is high, the combustion is insufficient, the coking is easy, and the problem of excessive water content of the packaged straw is caused in special weather.

In order to solve the technical problem, the utility model provides a double-deck straw vertical flue gas direct combustion boiler, include the boiler body and build by laying bricks or stones in this external brickwork of boiler, be equipped with chain grate and the water pipe grate that is used for supporting and burning the straw bale from top to bottom in proper order in the bottom of boiler body, the chain grate level is arranged, the water pipe grate is personally submitted certain angle slope with the level and is arranged, this internal water piping system and the blast system of still being equipped with respectively of boiler, the water piping system inner loop leads to heating medium water, just water piping system is connected with the water pipe grate, water piping system in proper order including set up in this internal boiler section of thick bamboo of boiler, upper water cooling nest of tubes and lower water cooling nest of tubes, the boiler section of thick bamboo connect in between upper water cooling nest of tubes and lower water cooling nest of tubes, air distribution equipment is external in control system, still including set up respectively in the upper smoke box and the lower floor's smoke box at boiler body top, between upper smoke box and the lower floor's smoke box and the vertical many tobacco pipes of being connected with respectively between upper water cooling nest of tubes and the lower water cooling nest of tubes.

In the above scheme, the front side of boiler body is equipped with feeding system and lower feeder hopper respectively, go up feeding system and water pipe grate mutual disposition, lower feeder hopper and traveling grate mutual disposition.

In the above scheme, go up feed system includes furnace gate and two first pneumatic cylinders, first pneumatic cylinder connect in go up the furnace gate, the feeder hopper is equipped with two second pneumatic cylinders down, the second pneumatic cylinder connect in the feeder hopper down, first pneumatic cylinder and second pneumatic cylinder are external respectively in driving system.

In the scheme, the lower water cooling pipe group is arranged between the chain grate and the water pipe grate, the upper water cooling pipe group is arranged above the water pipe grate, and the boiler barrel is square.

In the scheme, the water pipe grate is connected to the water cooling system, the water pipe grate is a plurality of steel pipes with the diameter of 133mm, the inclination angle of the water pipe grate and the horizontal plane is 8 degrees, and the vertical fall height of the water pipe grate is 1000mm.

In the scheme, the areas from front to back on the chain grate and the water pipe grate are a preheating area, a main combustion area and a burn-out area in sequence.

In the above scheme, be equipped with last stove arch and lower stove arch from top to bottom in the boiler body in proper order, go up the stove arch connect in on the front side inner wall of boiler body, lower stove arch connect in on the rear side inner wall of boiler body, go up the stove arch with down the stove arch arrange respectively in the top of water pipe grate, go up parallel arrangement between stove arch and the lower stove arch, just go up the stove arch and personally submit certain angle slope with the horizontal with lower stove arch and arrange, go up the stove arch and form by lower supreme circuitous formula passageway between the stove arch.

In the above scheme, the air blowing system sequentially comprises a furnace front air distribution device arranged on the front side of the bottom of the boiler body, a furnace rear air distribution device arranged on the rear side of the bottom of the boiler body, side air distribution devices respectively arranged on the left side and the right side of the boiler body, a lower arch front air distribution device arranged on the front side of the middle of the boiler body, and an upper arch rear air distribution device arranged on the rear side of the middle of the boiler body, wherein the furnace front air distribution device is arranged at a feed inlet of the boiler body, the furnace rear air distribution device is arranged between the water pipe grate and the lower arch, the side air distribution devices are arranged on the water pipe grate, the lower arch front air distribution device is arranged at the lower arch, and the upper arch rear air distribution device is arranged at the upper arch.

In the above scheme, the upper layer smoke box is provided with a smoke outlet.

The utility model discloses, adopt the mixed fuel that burning was smashed straw, biomass fuel, crushing straw on the traveling grate stoker to and the double-deck combustion mode of packing straw on the water pipe grate, make the burning of packing straw on the water pipe grate more thorough, the lime-ash is loose, and coking is not solved the too much problem of water content of packing straw.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention;

fig. 2 is a structural plan view of the drum of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

The utility model discloses a double-deck straw vertical flue gas direct combustion boiler, this text content can be referred to the technical staff in this field, and proper improvement technological parameter realizes. It is expressly noted that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be included in the invention and it is apparent to those skilled in the art that the inventive technique can be practiced and applied by modifying or appropriately combining the teachings herein without departing from the spirit and scope of the invention.

In utility model, unless otherwise specified, scientific and technical terms used herein have the meaning commonly understood by a person skilled in the art.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It should be noted that, in the description of the present invention, the terms "first" and "second" are only used for convenience of describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.

Definition about straw bales in raw state.

The original packed straw refers to the straw which is directly harvested and packed by a harvester in the field without secondary processing into blocks or particles. The heat value of the packed straw is generally about 3500 kcal, the volatile component is above 60%, the ash content is about 10%, the average sulfur content is not more than 0.4%, and the water content is about 10%. Comprehensive factors show that the fuel characteristics of the straws can be cleanly combusted, and the straw fuel is completely suitable for being used as boiler fuel.

Definition for biomass fuel.

The biomass material is burned as fuel, generally mainly agricultural and forestry waste (such as straw, sawdust, bagasse, rice chaff and the like), and is mainly different from fossil fuel. 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. The application of biomass fuel, in fact, mainly biomass briquette fuel (BMF), is a novel clean fuel which is prepared by using agricultural and forestry wastes as raw materials and through the processes of crushing, mixing, extruding, drying and the like, can be formed into various shapes (such as blocks, particles and the like) and can be directly combusted.

The conditions and calorific values and combustion conditions of the baled straw in various weathers are illustrated as follows:

the water content of the packed straw is 20-30% under normal weather conditions, the heat value of 1 ton of packed straw is equivalent to that of 1 ton of 3200 calories of fire coal, and the packed straw is extremely easy to burn;

when the straws are close to harvest, the straws growing under the influence of typhoon fall down obliquely, and the straws are soaked in water for too long time due to the accompanying rain, so that the water content of the harvested straws is too high. The water content of the packed straw is between 35% and 80%, the calorific value of 1 ton of packed straw is equivalent to that of 1 ton of coal burning of 3200-1400 calories, and the calorific value is reduced along with the increase of the water content, so that the packed straw is not easy to burn;

the packaged straws are rapidly cooled (snowing) after raining suddenly after being harvested normally, so that rainwater permeates into the packaged straws and freezes along with the outside of the packaged straws, the water content of the straws under the condition is generally between 60% and 85%, the heat value of 1 ton of the packaged straws is equivalent to that of 1 ton of 1800-1000 tons of fire coal, and the packaged straws under the condition are not combusted fully and part of the straws cannot be combusted.

The utility model discloses a feeding system (by fortune material shovel/claw car, go up feeding system 6, feeding system down, wherein fortune material shovel/claw car is not shown in the figure), combustion system (traveling grate 2, water pipe grate 17), water piping system (preceding water box, back water box, square boiler barrel 14, go up water cooling tube group 9, lower water cooling tube group 16, wherein preceding water box, back water box are not shown in the figure), blower system (air distribution equipment 1 before the stove, distribution equipment 13 behind the stove, arch down before air distribution equipment 7, side air distribution equipment 18, arch up after air distribution equipment 15, the plenum and the many air-blowers of grate, wherein the plenum and the air-blower of grate are not shown in the figure), boiler masonry part (outer furnace wall, arch 8, lower furnace arch 5), induced draft system (upper smoke box 12, lower floor smoke box 10, the flue, the draught fan, wherein the flue, the draught fan is not shown in the figure), deslagging system (not shown in the figure), control system (not shown in the figure) etc..

The specific structure is as shown in fig. 1-2, the utility model provides a double-layer straw vertical-exhaust flue gas direct-fired boiler, which comprises a boiler body and a boiler wall built outside the boiler body, wherein a chain grate 2 and a water pipe grate 17 for supporting and burning straw bales 19 are sequentially arranged in the bottom of the boiler body from top to bottom, the chain grate 2 is horizontally arranged, the water pipe grate 17 and the horizontal plane are obliquely arranged at a certain angle, and the front shaft and the rear shaft of the chain grate rotate to achieve the purposes of material transportation and burning;

the boiler body is also internally provided with a water pipe system and an air blowing system respectively, the water pipe system is internally circulated with heating medium water, the water pipe system is connected with the water pipe grate 17, the air blowing system is provided with air distribution equipment with different wind directions around the combustion areas of the chain grate 2 and the water pipe grate 17, and the air distribution equipment is externally connected with a control system. The control system is a system mainly comprising a frequency conversion cabinet and an operation control console, and the system mainly has the function of controlling the air distribution amount of the combustion chamber by controlling the rotating speed of each air distribution device and the rotating speed of the induced draft fan, so that the straw packed in the furnace can achieve the best combustion effect.

Further preferably, an upper feeding system 6 and a lower feeding system are respectively arranged on the front side of the boiler body, the upper feeding system 6 is arranged opposite to the water pipe fire grate 17, and the lower feeding system is arranged opposite to the chain fire grate 2.

Go up feed system 6 and include last furnace gate and two first pneumatic cylinders, first pneumatic cylinder is connected in last furnace gate, first pneumatic cylinder promotes and descends last furnace gate with the mode of push-and-pull, thereby reach opening the door and closing the door of last furnace gate, feed system includes that the feeding is shaken down 4 and two second pneumatic cylinders, the second pneumatic cylinder is connected and is shaken down 4 in the feeding, the extension of second pneumatic cylinder is shaken down 4 to the feeding and is opened and close, lower feeder hopper also is the supplementary feeding equipment of last feed system 6 simultaneously, make packing straw can be faster inside the entering furnace. First pneumatic cylinder and second pneumatic cylinder are external respectively in driving system, and driving system comprises the motor of control pneumatic cylinder, air-blower (join in marriage wind equipment promptly), draught fan, slagging-off machine, grate, and during the use to carry out basic fortune material equipment with fortune material shovel, claw car, carry out the pay-off to last feeding system 6 and lower feeding system respectively.

The water pipe system comprises a boiler barrel 14, an upper water cooling pipe group 9 and a lower water cooling pipe group 16 which are arranged in a boiler body in sequence, the boiler barrel 14 is connected between the upper water cooling pipe group 9 and the lower water cooling pipe group 16, the lower water cooling pipe group 16 is arranged between the traveling grate 2 and the water pipe grate 17, the water pipe grate 17 is connected to the water cooling pipe group 16, the water pipe grate 17 is a plurality of steel pipes with the diameter of 133mm, the inclination angle between the water pipe grate 17 and the horizontal plane is 8 degrees, and the vertical fall height of the water pipe grate 17 is 1000mm. The water pipe fire grate has the function that the packed straw entering the upper feeding system rolls into the upper part of the hearth on the water pipe fire grate with the inclination of 6 degrees and the vertical drop of 930mm for combustion, and the packed straw on the chain fire grate is combusted to support the combustion of the lower part of the packed straw. The double-layer combustion mode can enable packed straws in the hearth to be more sufficiently combusted, and water in a boiler water pipe system is rapidly heated.

The area from the front to the back on the chain grate and the water pipe grate is a preheating area, a main combustion area and a burn-out area in sequence, an upper furnace arch 8 and a lower furnace arch 5 are arranged in the boiler body from top to bottom in sequence, the upper furnace arch 8 is connected to the inner wall of the front side of the boiler body, the lower furnace arch 5 is connected to the inner wall of the rear side of the boiler body, the upper furnace arch 8 and the lower furnace arch 5 are arranged above the water pipe grate 17 respectively, the upper furnace arch 8 and the lower furnace arch 5 are arranged in parallel, the upper furnace arch 8 and the lower furnace arch 5 are obliquely arranged at a certain angle with the horizontal plane, a roundabout channel from bottom to top is formed between the upper furnace arch 8 and the lower furnace arch 5, and the function of the roundabout channel is that heat generated after packed straw is combusted passes through the lower furnace arch and then reaches the upper furnace arch to the front smoke box.

The air blowing system sequentially comprises a front air distribution device 1 arranged on the front side of the bottom of the boiler body, a rear air distribution device 13 arranged on the rear side of the bottom of the boiler body, side air distribution devices 18 respectively arranged on the left side and the right side of the boiler body, an upper arch rear air distribution device 15 arranged on the rear side of the middle of the boiler body, and a lower arch front air distribution device 7 arranged on the front side of the middle of the boiler body, wherein the front air distribution device 1 is arranged at a feed inlet of the boiler body, the rear air distribution device 13 is arranged between a water pipe grate 17 and a lower arch 5, the side air distribution devices 18 are arranged on the water pipe grate 17, the lower arch front air distribution device 7 is arranged at the lower arch 5, and the upper arch rear air distribution device is arranged at the upper arch 8. The furnace front air distribution equipment distributes air to the front part of the furnace door by a plurality of air distribution pipes, so that less air can enter the furnace door when the furnace door is opened, and the boiler can burn under negative pressure better; the air chambers of the furnace rear air distribution equipment, the side air distribution equipment and the fire grate are respectively arranged in the preheating zone, the main combustion zone and the burn-out zone, and are direct air distribution for fully combusting the front side, the side surface and the lower part of the packed straw; the air distribution equipment before and after the arch is auxiliary air distribution equipment which enables the heat generated by burning the packed straws to pass through the arch of the furnace more quickly.

The boiler is characterized by further comprising an upper smoke box 12 and a lower smoke box 10 which are arranged at the top of the boiler body respectively, wherein a plurality of smoke pipes which are vertically arranged are connected between the upper smoke box 12 and the lower smoke box 10 and between the upper water cooling pipe group 9 and the lower water cooling pipe group 16 respectively, a smoke outlet 11 is formed in the upper smoke box 12, and the upper smoke box is used for conveying heat and smoke dust sent from the boiler to a dust remover or other equipment through an air blower and a flue.

The utility model discloses still be equipped with deslagging system or slagging-off machine, make ash and residual clear up under combustion system burns.

The utility model discloses, change the horizontal tobacco pipe in the circular drum that has now into the tobacco pipe of the vertical installation of segmentation multiunit in square drum, make its abundant and furnace contact under the drum, can let the water in the drum heat more easily, the tobacco pipe of vertical installation can make the smoke and dust that passes through reduce the discharge of smoke and dust because of rolling over from top to bottom, adopt diameter 89mm thickness 4.5 mm's threaded smoke pipe, the degree of obstruction that the granule comburent in the flue gas passes through in the tobacco pipe has been reduced, the problem of the wearing and tearing of the granule comburent that forms in horizontal tobacco pipe after the straw burning has been solved.

The utility model discloses an upper fuel: straw baling, lower layer fuel: the mixed fuel of the crushed straws, the biomass fuel and the crushed straws is used as a combustion medium, the packed straws are fully combusted in a hearth in a double-layer combustion mode of a chain grate (lower-layer combustion) and a water pipe grate (upper-layer combustion), smoke is discharged in a circuitous way through a double-layer furnace arch, the heat is basically and completely absorbed by the hearth, the temperature in the furnace can reach about 1000 ℃, and the temperature of the discharged smoke is only 160-180 ℃.

The packed straw is further fully combusted by adopting a double-layer combustion mode of a chain grate and a water pipe grate to reduce coking; the chain grate has the advantage of speed-adjustable and stable operation, and conveys the final ash to a slag pit. Meanwhile, the double-layer furnace arch can play a role in enhancing the mixing of strong airflow, so that the purposes of continuous and stable combustion and full burning-out are achieved, and the heat is released in the hearth in the smoke gas circuitous discharging process.

The utility model discloses the function of each system is as follows:

1. a feeding system:

(1) The processing process of processing the straws into the biomass particles saves the processing cost of fuel.

(2) Without straw crushing equipment arranged at the front part of the straw boiler.

(3) Without front straw crushing equipment, the boiler installation space is greatly saved.

(4) The material conveying shovel/claw vehicle replaces straw crushing equipment, and when the equipment breaks down, a furnace does not need to be shut down to maintain the feeding equipment, so that the maintenance difficulty is greatly reduced.

2. A combustion system:

(1) Prevent the insufficient burning of the packed straw.

(2) The temperature of 30 tons of water can be raised to 85 ℃ by burning 1 ton of straw fuel, the heat value reaches the highest value, and the temperature is raised more quickly than that of a similar straw boiler.

(3) The coking problem is reduced.

3. An air blowing system:

(1) The packed straw is fully combusted by distributing air to support combustion for the packed straw.

(2) The flow direction and speed of part of heat are controlled by air distribution.

4. A boiler building part:

(1) The arrangement of the combustion chamber and the arrangement of the lower arch and the upper arch in the furnace lead the smoke dust to be discharged in a circuitous way through the double-layer furnace arch, thus leading the heat to be basically and completely absorbed by the hearth, leading the temperature in the furnace to reach about 1000 ℃, leading the straw with 35 percent of moisture to be completely combusted, leading the temperature of the discharged flue gas to be only 160-180 ℃, leading the heat not to be lost, and further achieving the purpose of high efficiency and energy saving.

(2) The smoke and dust in the flue gas are reduced, and the emission of harmful substances is reduced, so that the pressure of the dust remover is reduced, the effect of the dust remover is better, and the environmental protection requirement is met.

(3) A circuitous opening is formed between the tops of the two arches, and a preheating zone, a main combustion zone and an after-combustion zone are sequentially arranged on the traveling grate and the water pipe grate from front to back.

5. The control system comprises:

(1) The burning problem of packing straw of more accurate control.

(2) The combustion heat of the packed straw is controlled, and the smoke dust is reduced.

The technical effects of the utility model:

(1) The used packaged straws are air-dried for a period of time and then packaged according to corresponding sizes, secondary processing is not needed, and the comprehensive cost of fuel is greatly reduced.

(2) The mixed fuel of crushed straw/biomass fuel/crushed straw is combusted on the chain grate and the packed straw double-layer combustion mode on the water pipe grate is adopted, so that the packed straw on the water pipe grate is combusted more completely, ash slag is loose and is not coked, and the blank of straw combustion of an industrial boiler is filled

(3) The double-layer furnace arch is adopted to reasonably organize airflow flow and heat radiation, and simultaneously reduce the loss of smoke heat.

(4) The fire grate pieces do not need to be made of heat-resistant cast iron, so that the cost of the bottom fire grate is greatly reduced.

(5) The vertical installation form of the boiler barrel and the smoke tube increases the heating surface of the boiler, reduces the resistance of smoke, prolongs the service life of the smoke tube, reduces the emission of part of smoke dust, and meets the requirements of energy conservation and emission reduction.

The utility model discloses an application case of boiler

The utility model discloses having been designed and manufactured 2 10.5MW ordinary pressure hot water boilers successfully, 1 in Jilin province princess city green town in 2018-2020 operation two heating periods, another in Jilin province forever Jiji county a rabi town and 2019-2020 operation one heating period, all safe effective, energy-concerving and environment-protective, gained good effect.

The heat supply surfaces borne by the 2 boilers are 14 ten thousand square meters respectively, 30000 corn straw bags (specification 1.2 x 1.25) are burnt in each heating period respectively, the value is reduced to about 7500 tons, and the value is 150 ten thousand yuan, while the coal consumption of the coal-fired boiler which is steamed to tons in the same way is at least 3700 tons in each heating period, and the fuel value is about 203 ten thousand yuan measured according to 550 yuan/ton. Compared with the fuel value, the original straw bag is more dominant as the fuel.

The utility model discloses the boiler makes the technique more advanced owing to add boiler water pipe row, double-deck furnace arch, and consequently, the burning is more thorough, the air distribution is more reasonable, has reached the purpose of power saving, and the electrical equipment that adopts when making the boiler is only equivalent to 7MW coal fired boiler's configuration. For example, the induced air power is 55 kilowatts, the blower power is 5.5 kilowatts 2 tables =11 kilowatts, and the secondary air distribution blower power is 3.0 kilowatts 2 tables =6.0 kilowatts.

The present invention is not limited to the above best mode, and any person should learn the structural changes made under the teaching of the present invention, all with the present invention has the same or similar technical solution, all fall into the protection scope of the present invention.

Claims

1. The utility model provides a double-deck straw vertical flue gas direct combustion boiler, include the boiler body and build by laying bricks or stones in this external brickwork of boiler, its characterized in that, be equipped with in the bottom of boiler body from top to bottom in proper order and be used for supporting and burning the chain grate and the water pipe grate of straw bale, the chain grate level is arranged, certain angle slope arrangement is personally submitted with the level to the water pipe grate, this internal water piping system and the air-blast system of still being equipped with respectively of boiler, water piping system inner loop leads to heating medium water, just water piping system is connected with the water pipe grate, water piping system is including setting up in proper order this internal boiler section of thick bamboo, upper water cooling tube group and lower water cooling tube group of boiler, the boiler section of thick bamboo connect in between upper water cooling tube group and lower water cooling tube group, air distribution equipment is external to control system, still including set up respectively in the upper smoke box and the lower floor's smoke box at boiler body top, be connected with vertical many root tuber pipes of arranging between upper smoke box and the lower floor's smoke box respectively.

2. The double-layer straw vertical-exhaust smoke direct-combustion boiler as claimed in claim 1, wherein an upper feeding system and a lower feeding hopper are respectively arranged at the front side of the boiler body, the upper feeding system is arranged opposite to the water pipe grate, and the lower feeding hopper is arranged opposite to the chain grate.

3. The double-layer straw vertical flue gas direct-fired boiler according to claim 2, wherein the upper feeding system comprises an upper furnace door and two first hydraulic cylinders, the first hydraulic cylinders are connected to the upper furnace door, the lower feed hopper is provided with two second hydraulic cylinders, the second hydraulic cylinders are connected to the lower feed hopper, and the first hydraulic cylinders and the second hydraulic cylinders are respectively externally connected to a power system.

4. The double-layer straw vertical-exhaust smoke direct-combustion boiler according to claim 1, wherein the lower water-cooling tube group is arranged between the traveling grate and the water tube grate, the upper water-cooling tube group is arranged above the water tube grate, and the boiler barrel is square.

5. The double-layer straw vertical smoke direct-fired boiler according to claim 1, wherein the water pipe grate is connected to a water cooling system, the water pipe grate is a plurality of steel pipes with the diameter of 133mm, the inclination angle of the water pipe grate to the horizontal plane is 8 degrees, and the vertical fall height of the water pipe grate is 1000mm.

6. The double-layer straw vertical flue gas direct combustion boiler as claimed in claim 1, wherein the areas from front to back on the traveling grate and the water tube grate are a preheating area, a main combustion area and an ember area in sequence.

7. The double-layer straw vertical flue gas direct combustion boiler according to claim 1, wherein an upper furnace arch and a lower furnace arch are sequentially arranged in the boiler body from top to bottom, the upper furnace arch is connected to the front inner wall of the boiler body, the lower furnace arch is connected to the rear inner wall of the boiler body, the upper furnace arch and the lower furnace arch are respectively arranged above the water pipe fire grate, the upper furnace arch and the lower furnace arch are arranged in parallel, the upper furnace arch and the lower furnace arch are obliquely arranged at a certain angle with the horizontal plane, and a roundabout passage from bottom to top is formed between the upper furnace arch and the lower furnace arch.

8. The double-layer straw vertical smoke direct-fired boiler according to claim 7, wherein the blowing system comprises a front air distribution device arranged at the front side of the bottom of the boiler body, a rear air distribution device arranged at the rear side of the bottom of the boiler body, side air distribution devices respectively arranged at the left side and the right side of the boiler body, a lower arch front air distribution device arranged at the front side of the middle of the boiler body, and an upper arch rear air distribution device arranged at the rear side of the middle of the boiler body, the front air distribution device is arranged at a feed inlet of the boiler body, the rear air distribution device is arranged between the water pipe grate and the lower arch, the side air distribution devices are arranged above the water pipe grate, the lower arch front air distribution device is arranged at the lower arch, and the upper arch rear air distribution device is arranged at the upper arch.

9. The double-layer straw vertical flue gas direct combustion boiler as claimed in claim 1, wherein the upper layer smoke box is provided with a flue gas outlet.