CN212719692U - Original-state packed straw moving bed boiler - Google Patents
Original-state packed straw moving bed boiler Download PDFInfo
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- CN212719692U CN212719692U CN202021521412.7U CN202021521412U CN212719692U CN 212719692 U CN212719692 U CN 212719692U CN 202021521412 U CN202021521412 U CN 202021521412U CN 212719692 U CN212719692 U CN 212719692U
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Abstract
The utility model discloses an original form packing straw removes bed boiler, including boiler body and furnace structure, the inside of furnace structure is equipped with the grate, first furnace arch and second furnace arch have been arranged respectively in the furnace structure, first furnace arch from inside to outside upwards slope gradually, the second furnace arch is arranged in the top of fuel entry and by outer downward sloping gradually to the inside, first furnace arch and second furnace arch form circuitous S-shaped passageway in this internal formation of boiler, the air distribution system is including the first fan that generates air distribution once and wind channel, generate the second fan and the wind channel of secondary air distribution, generate the third fan and the wind channel of tertiary air distribution. The utility model discloses, add the water pipe grate of band saw tooth blade in the top of traveling grate or reciprocal grate, arrange double-deck furnace arch simultaneously, burn with the original straw package, realize clean burning, energy-efficient will extensively be used for the large and medium-sized boiler equipment of trades such as industrial production and heat supply heating.
Description
Technical Field
The utility model relates to a clean combustion apparatus, concretely relates to original state packing straw removes bed 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 disadvantages, and the following specific points are provided:
1. fuel state
(1) The straw power generation boiler belongs to a large-capacity boiler, if straws are 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 storage place and high transportation cost are needed;
(2) building a straw briquette fuel processing plant to produce block or granular fuel requires more equipment, fields and processing expenses, which leads to increased operating cost.
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 remove at high temperature, so that the boiler is difficult to operate;
(2) although the existing straw-packed direct-fired boiler is improved in the aspect of boiler air distribution, 1.2 x 1.25 straw bales still enter a hearth and are still in a lump, so that the straw bales cannot be immediately dispersed, the combustion is incomplete, and a small amount of residual fuel exists in ash, so that the heat value is influenced.
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 slag hardening of the fire grate is serious, and ash scale is 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.
In summary, a new type original straw boiler needs to be designed at present, the purposes of clean combustion and full burning-off are achieved, and no coking and less ash are generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems that the design of the existing straw boiler is unreasonable, the cost is high, the combustion is insufficient, and the coking is easy.
In order to solve the technical problem, the utility model adopts the technical scheme that a primitive form packing straw removes bed boiler is provided, including boiler body and the furnace structure that from top to bottom arranges, the inside of furnace structure is equipped with by supreme down in proper order:
the fire grate is used for supporting and conveying straw bags and ash residues and is arranged at the bottom of the hearth structure, and the front area and the rear area on the fire grate are a preheating area, a main combustion area and a burn-out area in sequence;
the first furnace arch and the second furnace arch are respectively arranged in the hearth structure, the first furnace arch is gradually inclined upwards from inside to outside, and the second furnace arch is arranged above the fuel inlet and gradually inclined downwards from outside to inside;
the first furnace arch and the second furnace arch form a circuitous S-shaped channel in the boiler body;
the air distribution system sequentially comprises a first fan and an air channel thereof which generate primary air distribution upwards along the bottom of the fire grate, a second fan and an air channel thereof which respectively generate secondary air distribution relatively and horizontally along two sides of the main combustion area, and a third fan and an air channel thereof which generate tertiary air distribution along the S-shaped channel.
In the scheme, a hydraulic machine for pushing straw bags into a boiler is arranged at a fuel inlet at the lower part of the hearth structure, and a feeding platform is connected between the hydraulic machine and the fuel inlet.
In the scheme, a water pipe grate is erected in parallel at a position which is 15 cm high right above the grate and is parallel to the grate, the water pipe grate is connected with the feeding platform, and a plurality of saw-toothed white steel blades are welded along the outer part of the water pipe grate at uniform intervals.
In the above scheme, an ash discharge door is arranged on the rear side wall of the boiler body between the first furnace arch and the second furnace arch, a steel cylinder is arranged in the top of the boiler body, a smoke tube is arranged in the steel cylinder, a front smoke box and a rear smoke box are respectively arranged at the front end and the rear end of the steel cylinder, the front smoke box is arranged in the boiler body, and the rear smoke box is arranged on the rear side wall of the boiler body.
In the above scheme, the air volume of the first fan, the second fan and the third fan is adjustable, and each fan is respectively connected with the exhaust pipe arranged on the rear side wall of the hearth structure.
In the scheme, the primary air distribution of the first fan is uniformly distributed towards the preheating zone, the main combustion zone and the burnout zone.
In the scheme, the front end of the first furnace arch is 2 meters high, and the rear end of the first furnace arch is 1.2 meters high.
In the scheme, the grate is a chain grate or a reciprocating grate.
The utility model discloses, add the water pipe grate of band saw tooth blade in the top of traveling grate or reciprocal grate, arrange double-deck furnace arch simultaneously, burn with the original straw package, realize clean burning, energy-efficient will extensively be used for the large and medium-sized boiler equipment of trades such as industrial production and heat supply heating.
Drawings
Fig. 1 is a schematic view of the internal structure of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The utility model discloses an original-state packed straw moving bed boiler, which can be realized by the technical personnel in the field by referring to the contents in the text and properly improving the process parameters. 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 the present application, unless otherwise specified, scientific and technical terms used herein have the meanings as commonly understood by one of ordinary skill in the art.
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.
As shown in figure 1, the utility model provides a pair of former attitude packing straw removes bed boiler, including boiler body 19 and the furnace structure that from top to bottom arranges, the inside of furnace structure is by supreme grate 5, first stove arch 13 and the second stove arch 14 of being equipped with in proper order down.
The fire grate 5 is used for supporting and conveying the straw bags 4 and ash slag and is arranged at the bottom of the hearth structure, the fire grate 5 can be an existing chain grate or a reciprocating grate, and the area from front to back (namely the direction from left to right in the drawing) on the fire grate 5 is a preheating area, a main combustion area and a burn-out area in sequence.
The first furnace arch 13 and the second furnace arch 14 are respectively arranged on the side wall of the interior of the hearth structure, the first furnace arch 13 gradually inclines upwards from inside to outside, the front end of the first furnace arch 13 is 2 meters high, the rear end of the first furnace arch 13 is 1.2 meters high, the second furnace arch 14 is arranged above the fuel inlet and gradually inclines downwards from outside to inside, the first furnace arch 13 and the second furnace arch 14 form a circuitous S-shaped channel in the boiler body 19, and the first furnace arch 13 and the second furnace arch 14 are sequentially arranged from bottom to top. The double-layer furnace arch can enhance the mixing of strong airflow, so that the smoke dust is discharged in a circuitous way, the purposes of continuous and stable combustion and full burn-out are achieved, the heat of the smoke gas is released in the circuitous discharge process, the temperature in the furnace can reach about 1000 ℃, and the temperature of the discharged smoke dust is only 120-140 ℃.
The utility model discloses still be equipped with the air distribution system, include in proper order along 5 bottoms of grate upwards to generate first fan 6 of air distribution and wind channel, along main district both sides relative level respectively generate second fan 8 of secondary air distribution and wind channel, along the third fan of S-shaped passageway formation cubic air distribution and wind channel, first fan 6' S a air distribution orientation preheating zone, main district and burn out district evenly distributed, first fan 6, the amount of wind of second fan 8 and third fan is adjustable, each fan is connected with the exhaust pipe 9 that sets up on the back lateral wall of furnace structure respectively. The specific model configuration and the specific installation structure of the fan are mature prior art, so that part of the fan structures are not shown in the figure, each fan or air duct is installed inside or outside the hearth structure according to actual conditions, and the specific installation position of the fan can be determined according to specific conditions.
Preferably, a hydraulic machine 2 for pushing the straw bales 4 into is arranged at a fuel inlet at the lower part of the hearth structure, and a feeding platform 3 is connected between the hydraulic machine 2 and the fuel inlet.
A water pipe grate 10 is erected in parallel at a position 15 cm above the grate 5, the water pipe grate 10 is connected with the feeding platform 3, and saw-toothed white steel blades 11 are welded along the outer part of the water pipe grate 10 at intervals. The structure designed in the way has the effects that the white steel blades 11 can break the outer package of the straw bag 4 layer by layer, scattered straws are fully combusted on the water pipe grate 10, and the residual fire falls on the chain or the reciprocating grate 5 to be continuously combusted. The bottom layer chain or the reciprocating grate has good coke breaking function and wide speed regulating range, and finally the ash slag is conveyed to the slag pit.
Further preferably, an ash discharge door 12 is arranged between the first furnace arch 13 and the second furnace arch 14 and on the rear side wall of the boiler body 19, a steel cylinder 17 is arranged on the top of the boiler body 19, a smoke and fire tube 16 is arranged inside the steel cylinder 17, a front smoke box 18 and a rear smoke box 15 are respectively arranged at the front end and the rear end of the steel cylinder 17, the front smoke box 18 is arranged inside the boiler body 19, and the rear smoke box 15 is arranged on the side wall of the boiler body 19.
The utility model discloses a combustion principle: the hydraulic press pushes the original straw bag to the water pipe grate, the outer package is cut layer by the saw-tooth white steel blade on the water pipe grate, so that the scattered straw moves and burns in the hearth, and the straw scattered on the lower chain grate or the reciprocating grate is combined with multiple air distribution to continue to burn fully; the temperature is quickly raised, and the temperature of 30 tons of water can be raised to 85 ℃ by burning 1 ton of straw fuel, so that the heat value reaches the highest value and coking is avoided; smoke dust is discharged in a circuitous way through the double-layer furnace arch, so that heat is basically and completely absorbed by the hearth, the temperature in the furnace can reach about 1000 ℃, even if the straw containing 35 percent of moisture can be completely combusted, the temperature of the discharged smoke gas is only 160-180 ℃, and the heat is not lost, thereby achieving the purposes of high efficiency and energy conservation.
The utility model discloses the technical effect of boiler as follows:
1. the utility model discloses an use original state straw package, do not need secondary operation, see the comprehensive cost of end fuel by a wide margin.
2. The water pipe grate with the knife is combined with the chain grate or the reciprocating grate to be used simultaneously, so that the boiler can be large-sized, the combustion is more thorough, ash is loose, the coking is avoided, and the blank of straw combustion of the 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 straw ash is commonly called as plant ash, is rich in nitrogen, phosphorus and potassium, is a good farmland fertilizer, is returned to the field on site and is fertile to soil.
The utility model discloses an application case
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, each heating period is respectively burnt by corn straw 30000 bags (the specification is 1.2 x 1.25), the value is about 7500 tons, and the value is 150 ten thousand yuan, while the coal consumption of the same steam-ton coal-fired boiler 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 adopted 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 power of an induced air fan is 55 kilowatts, the power of a blower is 5.5 kilowatts and 2 is 11 kilowatts, and the power of a secondary air distribution fan is 3.0 kilowatts and 2 is 6.0 kilowatts.
The utility model discloses, add the water pipe grate of band saw tooth blade in the top of traveling grate or reciprocal grate, arrange double-deck furnace arch simultaneously, burn with the original straw package, realize clean burning, energy-efficient will extensively be used for the large and medium-sized boiler equipment of trades such as industrial production and heat supply heating.
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 (8)
1. The utility model provides an original state packing straw removes bed boiler, includes boiler body and the furnace structure that from top to bottom arranges, its characterized in that, the inside of furnace structure is equipped with by supreme down in proper order:
the fire grate is used for supporting and conveying straw bags and ash residues and is arranged at the bottom of the hearth structure, and the front area and the rear area on the fire grate are a preheating area, a main combustion area and a burn-out area in sequence;
the first furnace arch and the second furnace arch are respectively arranged in the hearth structure, the first furnace arch is gradually inclined upwards from inside to outside, and the second furnace arch is arranged above the fuel inlet and gradually inclined downwards from outside to inside;
the first furnace arch and the second furnace arch form a circuitous S-shaped channel in the boiler body;
the air distribution system sequentially comprises a first fan and an air channel thereof which generate primary air distribution upwards along the bottom of the fire grate, a second fan and an air channel thereof which respectively generate secondary air distribution relatively and horizontally along two sides of the main combustion area, and a third fan and an air channel thereof which generate tertiary air distribution along the S-shaped channel.
2. The raw packed straw moving bed boiler according to claim 1, wherein a hydraulic machine for pushing straw bales into the boiler is arranged at a fuel inlet at the lower part of the hearth structure, and a feeding platform is connected between the hydraulic machine and the fuel inlet.
3. The raw packed straw moving bed boiler according to claim 2, wherein a water pipe grate is erected side by side at a position 15 cm high right above the grate and parallel to the grate, the water pipe grate is connected with the feeding platform, and a plurality of saw-toothed white steel blades are welded along the outside of the water pipe grate at uniform intervals.
4. The raw packed straw moving bed boiler according to claim 1, wherein an ash discharge door is provided between the first arch and the second arch and on a rear side wall of the boiler body, a steel cylinder is provided in a top of the boiler body, a smoke and fire tube is provided in the steel cylinder, a front smoke box and a rear smoke box are provided at front and rear ends of the steel cylinder, respectively, the front smoke box is provided in the boiler body, and the rear smoke box is provided on the rear side wall of the boiler body.
5. The raw packed straw moving bed boiler according to claim 1, wherein the air volume of the first fan, the second fan and the third fan is adjustable, and each fan is connected with an exhaust duct arranged on the rear side wall of the hearth structure.
6. The packed straw moving bed boiler according to claim 1, wherein the primary air distribution of the first fan is uniformly distributed towards the preheating zone, the main combustion zone and the burn-out zone.
7. The packed straw moving bed boiler according to claim 1, wherein the front end of the first arch is 2 meters high and the rear end is 1.2 meters high.
8. The raw packed straw moving bed boiler according to claim 1, wherein the grate is a traveling grate or a reciprocating grate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021521412.7U CN212719692U (en) | 2020-07-27 | 2020-07-27 | Original-state packed straw moving bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021521412.7U CN212719692U (en) | 2020-07-27 | 2020-07-27 | Original-state packed straw moving bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN212719692U true CN212719692U (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021521412.7U Active CN212719692U (en) | 2020-07-27 | 2020-07-27 | Original-state packed straw moving bed boiler |
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|---|---|
| CN (1) | CN212719692U (en) |
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- 2020-07-27 CN CN202021521412.7U patent/CN212719692U/en active Active
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