CN202902293U - Low odor type reed pulp black liquor combustion boiler - Google Patents
Low odor type reed pulp black liquor combustion boiler Download PDFInfo
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- CN202902293U CN202902293U CN 201220276291 CN201220276291U CN202902293U CN 202902293 U CN202902293 U CN 202902293U CN 201220276291 CN201220276291 CN 201220276291 CN 201220276291 U CN201220276291 U CN 201220276291U CN 202902293 U CN202902293 U CN 202902293U
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Abstract
The utility model discloses a low odor type reed pulp black liquor combustion boiler. The low odor type reed pulp black liquor combustion boiler comprises a boiler body structure, wherein an air supplying structure is arranged in a boiler chamber of the boiler body structure. The air supplying structure sequentially comprises a primary air supplying passage, a secondary air supplying passage and a tertiary air supplying passage from bottom to top, wherein air outlets of the primary air supplying passage are formed in the front wall, the rear wall, the left wall and the right wall of the boiler chamber, air outlets of the secondary air supplying passage are formed in the front wall and the rear wall of the boiler chamber, air outlets of the tertiary air supplying passage are formed in the front wall and the rear wall of the boiler chamber, and air inlet sections of the primary air supplying passage and the secondary air supplying passage are connected with an air pre-heater. Secondary air enters through the front wall and the rear wall alternatively, sufficient mixing of the air, smoke and black liquor particles is benefited, rising smoke is disturbed, turbulivity is improved, combustion is strengthened, the smoke is enabled to be distributed evenly in the boiler chamber, and the consistency of accordant sections of a temperature field is improved.
Description
Technical field
The utility model belongs to reed pulp black liquor treatment technology, is specifically related to a kind of pulping and paper-making industry chemical recovery system black-liquor combustion boiler technology.
Background technology
The reed pulp black liquor with pulp black liquor compare moisture high (moisture about 50%), calorific value is low, puffed degree is little, viscosity is large, than pulp black liquor burning difficulty, the reed pulp black liquor recovery boiler of present usefulness is then directly used for reference the pulp black liquor boiler and is designed, and arranges that at boiler tail cascade evaporator improves into furnace black liquid concentration.
The secondary wind distribution of these reed pulp black liquor recovery boilers adopts four sides wall layout, tertiary air to adopt left and right sides wall or front and back wall cross collocation, this arrangement easily is formed centrally " channel " in burner hearth, air does not mix fully with black liquor, black-liquor combustion is insufficient, burner hearth moves on the high-temperature region, cause the burning of upper furnace heating surface and back-end surfaces dust stratification serious, have a strong impact on boiler efficiency and the continuous cycle of operation; The process steam of factory is generally the saturated vapor of 0.5MPa and two kinds of pressure of 1.0MPa, and temperature can not surpass 180 ℃ after the boiler auxiliary combustion air adopted above-mentioned Steam Heating, and combustion air temperature is low, causes black-liquor combustion unstable, and boiler is regulated the load difficulty; Flue gas easily produces a large amount of contaminative foul smell when cascade evaporator adds hot black liquor.The problems such as existing reed pulp black liquor recovery boiler ubiquity black-liquor combustion is unstable, efficiency of combustion is low, collecting ash is serious, the cycle of operation is short, generation secondary pollution foul smell.
Summary of the invention
The purpose of this utility model is to provide a kind of low smelly type reed pulp black-liquor combustion boiler, to address the above problem.
The technical scheme of the low smelly type reed pulp black-liquor combustion boiler of the utility model is: comprise the Boiler Furnace body construction, the air-supply structure in the burner hearth in the Boiler Furnace body construction comprises a supply air duct, Secondary Air air delivery duct and the tertiary air air delivery duct that sets gradually from bottom to up; The air outlet of a described supply air duct is arranged on front wall, Hou Qiang, left side wall and the right-side wall of burner hearth; The air outlet in described secondary blast air channel is arranged on the front wall of burner hearth, the rear wall; The air outlet of three supply air ducts is arranged on the front wall of burner hearth, the rear wall; The wind inlet section of supply air duct, Secondary Air air delivery duct connects air preheater.
Above-mentioned Boiler Furnace body construction is to consist of the burning boiler agent structure, comprises body of wall, burner hearth, heating surface, safety device, fume extractor, reed pulp black liquor spray feed device, slag-draining device etc., and it is existing boiler body structure.
The air outlet in the secondary blast air channel on the described front wall and the air outlet in the secondary blast air channel on the rear wall shift to install, and air outlet is arranged in same absolute altitude, and on the front wall on air outlet quantity and the rear wall air outlet quantity not identical.
The air outlet of three supply air ducts on the described front wall and the air outlet of three supply air ducts on the rear wall shift to install, and air outlet is arranged in same absolute altitude, and on the front wall on air outlet quantity and the rear wall air outlet quantity not identical.
Described secondary blast air channel comprises that high secondary supply air duct and the low secondary blast air channel of lower leaf setting is two-layer.
Described air preheater is arranged in the smokejack of Boiler Furnace body construction.
Economizer is set after the described air preheater.
Described boiler tail does not arrange cascade evaporator.
The more existing pulp black liquor boiler structure of the utility model boiler has following improvement:
1. behind the cancellation cascade evaporator, eliminated bulky, the heavy not high cascade evaporator backwardness technology of reliability security that causes of structure; Solve flue gas and in adding the hot black liquor process, produced irritating foul smell and the problem of contaminated environment.
2. behind the employing air preheater, the combustion air temperature can be brought up to higher level, improve fire box temperature, be conducive to the improvement of black-liquor combustion in the boiler, make black-liquor combustion become stable, be convenient to regulate boiler load, and be conducive to improve boiler thermal output.
3. arrange behind air preheater that economizer can effectively reduce exhaust gas temperature, reduce heat loss due to exhaust gas, improve boiler thermal output.
3. air stage feeding meets the basic principle of burning, and is conducive to control nitrogen oxide (NOx) discharging.
4. wind, Secondary Air and a tertiary air configure separately blower fan and are conducive to the stable of air feed system, and can select the blower fan of different pressure heads according to the needs of burning, and operability is improved.
5. a wind four sides wall is evenly arranged and is conducive to keep the burner hearth bottom bed course stable, and the carbon after the dry cracking of black liquor is fully burnt.Secondary Air is sent into from front-back wall is staggered, is conducive to fully mixing of air and flue gas and black liquor particle, upsets the rising flue gas, improves turbulivity, and overheavy firing is evenly distributed flue gas in burner hearth, the uniformity of the maximum section of passenger flows such as raising temperature field; The interlaced arrangement Secondary Air is conducive to the control pad layer height.Tertiary air is used for fuel gas and burns, and tertiary air adopts front-back wall to arrange, tertiary air is fully mixed with high-temperature flue gas, guarantees that the fuel gas remaining in the Secondary Air zone burns fully and reduce carry-over loss, the dust stratification of minimizing back-end surfaces at this.
6, the present invention has the effectively phosphorus content in the melting sode ash that flows out of make furnace bottom lower of good stove internal combustion aerodynamic field, and the green liquor clarification degree is reduced, and has improved the green liquor quality.
Description of drawings
Fig. 1 hangs down smelly type reed pulp black-liquor combustion boiler structure schematic diagram.
The air outlet of a supply air duct of Fig. 2 is arranged schematic diagram.
The air outlet in Fig. 3 secondary blast air channel is arranged schematic diagram
The air outlet of three supply air ducts of Fig. 4 is arranged schematic diagram.
The specific embodiment
The utility model Boiler Furnace body construction is to consist of the burning boiler agent structure, comprise body of wall, burner hearth, heating surface, safety device, fume extractor, reed pulp black liquor spray feed burner, slag-draining device etc., it is existing boiler body structure, its concrete structure is tired stating not, described explanation for the utility model technical characterictic.
As shown in Figure 1, burner hearth 1 is the main combustion zone of air and the reaction of black liquor mixed occurrence, and the four sides wall of burner hearth is made of fin panel casing, and insulation layer in the outside covers, to reduce radiation loss; Establish reed pulp black liquor spray feed burner 13 in the burner hearth 1 in the Boiler Furnace body construction.Air-supply structure in the burner hearth 1 comprises a supply air duct 9, Secondary Air air delivery duct 10 and the tertiary air air delivery duct 11 that arranges in proper order from bottom to up; Be provided with air preheater 2 in the exit flue 14 in the Boiler Furnace body construction.
The air intake airduct that the air intake airduct of a supply air duct 9 connects 5, three supply air ducts 11 of air intake airduct connection UNICOM's overfire air fan in UNICOM's primary air fan 4, secondary blast air channel 10 connects UNICOM's tertiary air machine 8; Primary air fan 4 connects wind heater 6 of UNICOM, and overfire air fan 5 connects UNICOM's Secondary Air heater 7.One time wind heater 6, Secondary Air heater 7 are connected UNICOM with air preheater 2, and air preheater 2 is plank frame, adopt plank frame can be conducive to deashing, can select 3 grades or 5 grades according to actual design layout needs air preheater.Air preheater 2 ends are exported to be connected with the secondary blast air channel with a supply air duct 9 respectively and are connected UNICOM.Arrange economizer 3 behind the air preheater in the exit flue 14; Economizer 3 adopts the horizontal type structure in-line arrangement, can reduce arrangement space and be beneficial to deashing, and economizer can further reduce flue-gas temperature, and exhaust gas temperature is reached below 200 ℃, improves efficiency of energy utilization.
The layout of the air outlet of a supply air duct as shown in Figure 2, the air outlet 12.1 of a supply air duct is arranged on front wall 1.1, rear wall 1.2, left side wall 1.3 and the right-side wall 1.4 of burner hearth, be formed on the burner hearth four sides wall and be evenly arranged, air outlet 12.1 relative corresponding setting on the front wall 1.1 of burner hearth, rear wall 1.2; Air outlet 12.1 is relative corresponding the setting on the left side of burner hearth wall 1.3 and right-side wall 1.4.Air outlet 12.1 height and positions on the burner hearth four sides wall are relative with the burner hearth bottom bed course, are beneficial to keep the burner hearth bottom bed course stable, and the carbon after the dry cracking of black liquor is fully burnt.
The layout of the air outlet in secondary blast air channel as shown in Figure 2, the air outlet in secondary blast air channel is arranged on front wall 1.1, the rear wall 1.2 of burner hearth; Wherein the air outlet 12.3 in the secondary blast air channel on the rear wall 1.2 of the air outlet 12.2 in the secondary blast air channel on the front wall 1.1 of burner hearth and burner hearth shifts to install.The air outlet quantity in the secondary blast air channel on the air outlet quantity in the secondary blast air channel on the front wall and the rear wall is not identical, and the air outlet quantity in the secondary blast air channel on the rear wall is the air outlet quantity ± 1 in front wall secondary blast air channel.Such as on the front wall 3, on the rear wall 2.Arranging of each air outlet in secondary blast air channel is highly identical.
As shown in Figure 4, the arrangement form of the air outlet of three supply air ducts is identical with the arrangement form of the air outlet in secondary blast air channel, but air outlet 12.3 quantity of three supply air ducts are not identical with air outlet 12.2 quantity in secondary blast air channel; The air outlet quantity m of three supply air ducts is less than the air outlet quantity x in secondary blast air channel.Three times supply air duct is located at reed pulp black liquor spray feed burner 13 tops.
Above-mentioned Secondary Air air outlet, tertiary air air outlet be furnished with good rigidity and penetrability, can guarantee and furnace high-temperature flue gas mixing cmpletely, strengthen the burning of black liquor, be beneficial to the complete after-flame of black liquor particle and fuel gas, improve efficiency of combustion.This kind air supply mode can make the main combustion zone in the burner hearth be controlled near the Secondary Air, and the high-temperature region is positioned at lower furnace portion, is beneficial to drying, pyrolysis and the after-flame of black liquor.
Comprise that for the secondary blast air channel of the boiler of the above capacity of 500tds/d high secondary supply air duct and low secondary blast air channel that upper lower leaf arranges are two-layer, form high Secondary Air supply air duct, low Secondary Air supply air duct.
Above-mentioned boiler combustion reed pulp black liquor: wind heater 6 and Secondary Air heater 7 are a kind of finned tube heaters, take saturated vapor as thermal source cold air is heated to 80 ℃ ~ 150 ℃, air themperature after once air-supply, secondary blast heat by air preheater 2 reaches 200 ℃ ~ 300 ℃, delivers to the air outlet of a supply air duct and the air outlet in secondary blast air channel; 9 static pressure of a supply air duct reaches 500Pa ~ 1200Pa, primary air ratio 0.3 ~ 0.4; Secondary blast air channel 10 static pressure reach 1500Pa ~ 3000Pa, secondary air ratio 0.4 ~ 0.5; Three supply air duct 11 blast reach 2500Pa ~ 4000Pa, the tertiary air rate is 0.1 ~ 0.3; Air at room temperature is adopted in three air-supplies.
After the burning, a wind is sent into stable in the utility model burner hearth; Secondary Air does not form at the burner hearth center and crosses, and has stronger penetrability; Do not have between the tertiary air of front-back wall to form to liquidate, solved the problem that tertiary air has aggravated the aerodynamic field deterioration in the prior art, the bad problem of flue gas degree of filling of whole burner hearth.
The utility model boiler has solved existing boiler because bad causing of aerodynamic field moves on the burner hearth high-temperature region, causes furnace outlet zone flue-gas temperature too high, and this safety to upper furnace is unfavorable; And do not form long and narrow high temperate zone at the burner hearth center, this is dry favourable to black liquor, is easy to regulate alkali stove load.
The whole speed flowing field of utility model boiler is evenly distributed, and the existing black liquor recovery boiler of velocity ratio is much lower, has so just prolonged the time of staying of combustible in stove, has improved efficiency of combustion.
The machinery of utility model boiler carries with carry-over loss and greatly reduces, and this can reduce the dust stratification of convection heating surface, greatly prolongs the cycle of operation of alkali recovery boiler, generally improves more than 2 times than existing black liquor recovery boiler.
Above-mentionedly show two, tertiary air orifice adopts the front-back wall dislocation to arrange and high wind speed, good rigidity and penetrability are arranged, can guarantee and furnace high-temperature flue gas mixing cmpletely, strengthen the burning of black liquor, be beneficial to the complete after-flame of black liquor particle and fuel gas, improve efficiency of combustion.This kind air supply mode can make the main combustion zone in the burner hearth be controlled near the Secondary Air, and the high-temperature region is positioned at lower furnace portion, is beneficial to drying, pyrolysis and the after-flame of black liquor.The Secondary Air flow velocity is higher, has stronger penetrability, can effectively control the height of bed course, improves the security of boiler operatiopn.Tertiary air is positioned at upper furnace, forms air screen in this zone, namely unburnt gas fuel burning in the flue gas fully also can be able to be reduced flying dust and carry.
After the cascade evaporator cancellation in the existing boiler, flue gas does not contact with black liquor, has eliminated the generation of foul smell, has improved environmental-protecting performance.
Claims (6)
1. one kind is hanged down smelly type reed pulp black-liquor combustion boiler, and it comprises the Boiler Furnace body construction, and the air-supply structure in the burner hearth in the Boiler Furnace body construction comprises a supply air duct, Secondary Air air delivery duct and the tertiary air air delivery duct that sets gradually from bottom to up; It is characterized in that the air outlet of a described supply air duct is arranged on the front wall of burner hearth, Hou Qiang, left side wall and the right-side wall; The air outlet in described secondary blast air channel is arranged on the front wall of burner hearth, the rear wall; The air outlet of three supply air ducts is arranged on the front wall of burner hearth, the rear wall; The wind inlet section of supply air duct, Secondary Air air delivery duct connects air preheater.
2. hang down as claimed in claim 1 smelly type reed pulp black-liquor combustion boiler, it is characterized in that the air outlet in the secondary blast air channel on the front wall and the air outlet in the secondary blast air channel on the rear wall shift to install, air outlet is arranged in same absolute altitude, and on the front wall on air outlet quantity and the rear wall air outlet quantity not identical.
3. hang down as claimed in claim 1 smelly type reed pulp black-liquor combustion boiler, it is characterized in that the air outlet of three supply air ducts on the front wall and the air outlet of three supply air ducts on the rear wall shift to install, air outlet is arranged in same absolute altitude, and on the front wall on air outlet quantity and the rear wall air outlet quantity not identical.
4. hang down as claimed in claim 1 or 2 smelly type reed pulp black-liquor combustion boiler, it is characterized in that described secondary blast air channel comprises that high secondary supply air duct and the low secondary blast air channel of lower leaf setting are two-layer.
5. hang down as claimed in claim 1 smelly type reed pulp black-liquor combustion boiler, it is characterized in that described air preheater is arranged in the smokejack of Boiler Furnace body construction.
6. as described in claim 1 or 5, hang down smelly type reed pulp black-liquor combustion boiler, it is characterized in that after the described air preheater economizer being set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220276291 CN202902293U (en) | 2012-06-12 | 2012-06-12 | Low odor type reed pulp black liquor combustion boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220276291 CN202902293U (en) | 2012-06-12 | 2012-06-12 | Low odor type reed pulp black liquor combustion boiler |
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| Publication Number | Publication Date |
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| CN202902293U true CN202902293U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220276291 Withdrawn - After Issue CN202902293U (en) | 2012-06-12 | 2012-06-12 | Low odor type reed pulp black liquor combustion boiler |
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| CN (1) | CN202902293U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734808A (en) * | 2012-06-12 | 2012-10-17 | 武汉锅炉集团工程技术有限公司 | Low-odor type reed pulp black liquor combustion boiler and combustion method thereof |
| CN104534485A (en) * | 2014-12-11 | 2015-04-22 | 亚太森博（山东）浆纸有限公司 | Method for reducing emission concentration of nitrogen oxides during liquid methanol treatment of pulp mill odor incinerator |
-
2012
- 2012-06-12 CN CN 201220276291 patent/CN202902293U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734808A (en) * | 2012-06-12 | 2012-10-17 | 武汉锅炉集团工程技术有限公司 | Low-odor type reed pulp black liquor combustion boiler and combustion method thereof |
| CN102734808B (en) * | 2012-06-12 | 2015-06-10 | 武汉锅炉集团工程技术有限公司 | Low-odor type reed pulp black liquor combustion boiler and combustion method thereof |
| CN104534485A (en) * | 2014-12-11 | 2015-04-22 | 亚太森博（山东）浆纸有限公司 | Method for reducing emission concentration of nitrogen oxides during liquid methanol treatment of pulp mill odor incinerator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130424 Effective date of abandoning: 20150610 |
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| RGAV | Abandon patent right to avoid regrant |