CN110625725B - Optimized heat supply method and equipment for bamboo board processing - Google Patents
Optimized heat supply method and equipment for bamboo board processing Download PDFInfo
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- CN110625725B CN110625725B CN201911016422.7A CN201911016422A CN110625725B CN 110625725 B CN110625725 B CN 110625725B CN 201911016422 A CN201911016422 A CN 201911016422A CN 110625725 B CN110625725 B CN 110625725B
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 50
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 50
- 241001330002 Bambuseae Species 0.000 title claims abstract description 50
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 50
- 239000011425 bamboo Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000001035 drying Methods 0.000 claims abstract description 45
- 238000003825 pressing Methods 0.000 claims abstract description 35
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003546 flue gas Substances 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 23
- 239000000446 fuel Substances 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000003763 carbonization Methods 0.000 claims description 19
- 238000004134 energy conservation Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 21
- 238000004519 manufacturing process Methods 0.000 description 8
- 241000196324 Embryophyta Species 0.000 description 7
- 238000007664 blowing Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
- B27J1/00—Mechanical working of cane or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H6/00—Combined water and air heaters
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Forests & Forestry (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an optimized heat supply method and equipment for bamboo board processing, wherein the method comprises the steps of removing an original steam-water heat exchanger, a steam-gas heat exchanger, a dust remover and a chimney; a second economizer, a labyrinth type hot-blast stove and a hot-blast stove induced draft fan are additionally arranged, the second economizer and the first economizer are connected in series to form a hot water heater with a pressing plate process, and the heat of boiler flue gas is utilized to directly heat pressing plate hot water; the fuel of the maze hot blast stove is bamboo green, tabasheer and/or bamboo powder; the labyrinth type hot blast stove directly supplies hot air to the drying kiln through a hot blast stove induced draft fan; the boiler induced draft fan is communicated with the air inlet of the labyrinth type hot blast stove through a flue gas pipeline. The invention reduces energy consumption, improves total heat efficiency and achieves the purposes of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the field of bamboo board processing and heat supply, relates to how to optimize heat supply for an existing bamboo board processing plant to achieve the purposes of energy conservation and emission reduction, and in particular relates to an optimized heat supply method and equipment for bamboo board processing.
Background
The south of China has huge bamboo resources for development and utilization, and the processing and utilization technology of bamboo boards is also greatly developed besides the traditional braiding at present. In the processing process of the bamboo boards, hot air is required to be used for drying, steam is required to be used for carbonization, and hot water is also required to be used for pressing plates. Wherein the heat load for drying accounts for 50% of the total heat load, carbonization accounts for 25%, and pressing plate accounts for 25%. In order to meet the requirements of the three heat sources simultaneously, a steam boiler for burning waste bamboo green, bamboo yellow and fine bamboo powder generated by bamboo board processing is arranged in a bamboo board processing factory, a steam-gas heat exchanger is arranged for heating hot air for a drying process in addition to being directly used in a carbonization process, and a steam-water heat exchanger is arranged for heating hot water for a pressing plate process.
Because the drying and pressing plate are subjected to steam-gas and steam-water conversion, heat exchange loss is generated, and because a great part of heat is taken away by the smoke discharged from the boiler, the comprehensive heat supply efficiency of the bamboo board processing plant is generally not more than 70%, and the heat supply efficiency is very low.
Disclosure of Invention
The invention aims to optimize and reform a heating system of an existing built bamboo board processing plant, and provides an optimized heating method and equipment for processing bamboo boards, which can reduce energy consumption, improve total heat efficiency and achieve the purposes of energy conservation and emission reduction.
The technical scheme for realizing the aim of the invention is as follows:
an optimized heat supply method for bamboo board processing comprises
A boiler;
the first economizer, the dust remover, the boiler induced draft fan and the chimney are sequentially communicated with the boiler through the flue gas pipeline;
a steam-water heat exchanger and a steam-air heat exchanger which are communicated with the boiler through steam pipelines; the carbonization machine is communicated with the boiler through a steam pipeline;
the steam-water heat exchanger is communicated with the circulating water pump and the plate pressing machine through a hot water pipeline to form closed circulation;
the steam-gas heat exchanger is communicated with the drying kiln through a hot air pipeline;
in contrast to the prior art,
removing the steam-water heat exchanger, the steam-air heat exchanger, the dust remover and the chimney;
a second economizer, a labyrinth type hot blast stove and a hot blast stove induced draft fan are additionally arranged,
the second economizer and the first economizer are connected in series to form a hot water heater with a pressing plate process, and the hot water heater directly heats the pressing plate by using the heat of the boiler flue gas;
the fuel of the maze hot blast stove is bamboo green, tabasheer and/or bamboo powder; the labyrinth type hot blast stove directly supplies hot air to the drying kiln through a hot blast stove induced draft fan;
the boiler induced draft fan is communicated with the air inlet of the labyrinth type hot blast stove through a flue gas pipeline.
Further, the drying kiln comprises an exhaust hood and an unpowered natural exhaust pipe communicated with the exhaust hood, wherein the exhaust hood is arranged on an exhaust port of the drying kiln.
Further, the hot blast stove comprises a hot blast stove blower, and the hot blast stove blower is communicated with an air inlet of the labyrinth hot blast stove through a cold air pipeline.
The first economizer, the second economizer, the plate pressing machine and the circulating water pump are communicated through a circulating hot water pipeline to form closed loop circulation; the boiler, the first economizer, the second economizer and the boiler induced draft fan are sequentially communicated through a flue gas pipeline.
An optimized heating apparatus for processing bamboo boards by the method comprises
A boiler;
the first economizer, the dust remover and the boiler induced draft fan are sequentially communicated with the boiler through a flue gas pipeline;
the carbonization machine is communicated with the boiler through a steam pipeline;
in contrast to the prior art,
a second economizer, a labyrinth type hot blast stove and a hot blast stove induced draft fan are additionally arranged,
the second economizer is connected with the first economizer in series, and the first economizer, the second economizer, the plate pressing machine and the circulating water pump are communicated through a circulating hot water pipeline to form closed loop circulation; the boiler, the first economizer, the second economizer and the boiler induced draft fan are sequentially communicated through a flue gas pipeline;
the labyrinth type hot blast stove is communicated with the drying kiln through a hot blast stove induced draft fan and a hot blast pipeline;
the boiler induced draft fan is communicated with the air inlet of the labyrinth type hot blast stove through a flue gas pipeline.
Further, the drying kiln comprises an exhaust hood and an unpowered natural exhaust pipe communicated with the exhaust hood, wherein the exhaust hood is arranged on an exhaust port of the drying kiln.
Further, the hot blast stove comprises a hot blast stove blower, and the hot blast stove blower is communicated with an air inlet of the labyrinth hot blast stove through a cold air pipeline.
The invention optimizes and reforms the heating system of the built bamboo board processing factory according to the method:
the matched steam boiler is modified to be capable of directly supplying steam for carbonization and directly supplying hot water for pressing plates. The specific improvement content is that a first economizer of the tail heating surface of the boiler is disconnected from a boiler water supply system, a second economizer is added, the two economizers are connected in series to form a hot water heater of a pressing plate process, and the hot water of the pressing plate is directly heated by utilizing the heat of boiler flue gas. The heat exchange area of the newly added economizer is determined according to the specific hot water load accounting of each processing plant.
Because the steam-producing heating surface of the steam boiler is far larger than the heating surface of the economizer, most of the water-cooled walls of the boiler furnace are required to be coated with refractory concrete, so that the yields of steam and hot water are matched, and the area of the paste is determined according to the calculation of the specific steam-water load ratio of each processing plant.
According to the characteristic that the bamboo board processing waste does not contain sulfur, a labyrinth type hot blast furnace for burning the green bamboo, the yellow bamboo and/or the bamboo powder is additionally arranged for directly supplying hot air for drying. The specific size of the hot blast stove is determined according to the specific drying heat load accounting of each processing plant.
The labyrinth type hot blast stove has the dust removing function, so that the smoke and dust content of the hot blast stove reach the emission standard, and the smoke discharged by the boiler is also introduced into the labyrinth of the hot blast stove to be combined together for natural sedimentation and dust removal and then used as a drying heat source.
The air-out of the labyrinth type hot-blast stove is sent into a drying kiln to dry bamboo materials by a hot-blast stove induced draft fan, and the air-out of the labyrinth type hot-blast stove is discharged to the outdoor atmosphere by an unpowered natural air-out pipe.
After the transformation, the steam-water heat exchanger of the original pressing plate procedure and the steam-air heat exchanger of the drying procedure are removed to reduce the conveying resistance of hot water and hot air, and the dust remover and the chimney are removed.
The working process comprises the following steps:
directly delivering the steam produced by the boiler into a carbonization machine for carbonization;
circulating hot water produced by the two-stage serial-connection economizer is pumped into a plate pressing machine by a circulating water pump to be pressed, and then returns to the two-stage serial-connection economizer to be circularly heated;
the boiler flue gas flow is as follows: the fuel enters the boiler, burns under the blowing of a boiler blower, and enters the first economizer and the newly added second economizer to heat circulating hot water after the flue gas passes through the boiler to exchange heat, and then enters the labyrinth hot blast stove to be mixed with hot air produced by the hot blast stove under the suction of a boiler induced draft fan;
the hot air drying process comprises the following steps: the fuel enters a labyrinth type hot air furnace, the fuel is combusted under the blowing of a blower of the hot air furnace to form hot air, the hot air enters a drying kiln for drying after natural sedimentation and dust removal through a labyrinth air chamber of the labyrinth type hot air furnace, and the residual air after drying is collected by an exhaust hood and is discharged into the atmosphere through an unpowered natural exhaust pipe;
the invention has the advantages and effects that:
compared with the heating mode of the prior art, the total heat efficiency is improved by at least one time, the total heat efficiency is improved to more than 90%, the electricity consumption is reduced by 30 degrees per hour, the bamboo board processing waste can completely meet the fuel requirement, the bamboo shoot keeping period does not need to purchase fuel outsourcly, the drying period is shortened to 2 days from the current 3 days, the pressing plate and carbonization period are also reduced, dust can not exist on the production site, and the dust problem of the working environment is fundamentally solved, so that an exemplary enterprise of clean production, green production, energy conservation and emission reduction and recycling economy enterprises is built.
Drawings
FIG. 1 is a schematic diagram of a heat supply flow chart for processing a bamboo board before optimization and transformation;
fig. 2 is a schematic diagram of a heat supply flow chart for processing bamboo boards after optimization and transformation in an embodiment.
In the figure, 1, a boiler 2, a boiler blower 3, a first economizer 4, a dust remover 5, a boiler induced draft fan 6, a chimney 7, a carbonizer 8, a steam-water heat exchanger 9, a circulating water pump 10, a plate pressing machine 11, a steam-gas heat exchanger 12, a hot air fan 13, a drying kiln 14, a boiler fuel inlet 15, a second economizer 16, a labyrinth type hot air furnace 17, a hot air furnace induced draft fan 18, an exhaust hood 19, an unpowered natural exhaust pipe 20, a hot air furnace blower 21 and a hot air furnace fuel inlet.
Y represents a flue gas pipeline, L represents a cold air pipeline, S represents a hot water pipeline, Z represents a steam pipeline, and R represents a hot air pipeline.
Arrows indicate flow direction.
Detailed Description
The present disclosure is further illustrated below with reference to examples and figures, it being apparent that the described examples are only some, but not all, of the examples of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
as shown in FIG. 1 and FIG. 2, an optimized heating method for bamboo board processing comprises
A boiler 1;
the first economizer 3, the dust remover 4, the boiler induced draft fan 5 and the chimney 6 are sequentially communicated with the boiler 1 through a flue gas pipeline;
a steam-water heat exchanger 8 and a steam-air heat exchanger 11 which are communicated with the boiler 1 through steam pipelines; the carbonization machine 7 is communicated with the boiler 1 through a steam pipeline;
the steam-water heat exchanger 8 is communicated with the circulating water pump 9 and the plate pressing machine 10 through a hot water pipeline to form a closed cycle;
the steam-gas heat exchanger 11 is communicated with the drying kiln 13 through a hot air pipeline;
in contrast to the prior art,
removing the steam-water heat exchanger 8, the steam-water heat exchanger 11, the dust remover 4 and the chimney 6;
a second economizer 15, a labyrinth type hot blast stove 16 and a hot blast stove induced draft fan 17 are additionally arranged,
the second economizer 15 and the first economizer 3 are connected in series to form a hot water heater in a pressing plate procedure, and the heat of boiler flue gas is utilized to directly heat pressing plate hot water;
the fuel of the maze hot blast stove 16 is bamboo green, yellow and/or bamboo powder; the labyrinth type hot blast stove 16 directly supplies hot air to the drying kiln 13 through a hot blast stove induced draft fan 17;
the boiler induced draft fan 5 is communicated with an air inlet of the labyrinth type hot blast stove 16 through a flue gas pipeline.
Further, the drying kiln comprises an exhaust hood 18 and an unpowered natural exhaust pipe 19 communicated with the exhaust hood 18, wherein the exhaust hood 18 is arranged on an exhaust outlet of the drying kiln 13.
Further, a hot blast stove blower 20 is included, and the hot blast stove blower 20 is communicated with an air inlet of the labyrinth hot blast stove 16 through a cold air pipeline.
The first economizer 3, the second economizer 15, the plate pressing machine 10 and the circulating water pump 9 are communicated through a circulating hot water pipeline to form closed loop circulation; the boiler 1, the first economizer 3, the second economizer 15 and the boiler induced draft fan 5 are sequentially communicated through a flue gas pipeline.
An optimized heating apparatus for processing bamboo boards by the method comprises
A boiler 1;
and a first economizer 3, a dust remover 4 and a boiler induced draft fan 5 which are sequentially communicated with the boiler 1 through a flue gas pipeline;
the carbonization machine 7 is communicated with the boiler 1 through a steam pipeline;
in contrast to the prior art,
a second economizer 15, a labyrinth type hot blast stove 16 and a hot blast stove induced draft fan 17 are additionally arranged,
the second economizer 15 is connected in series with the first economizer 3, and the first economizer 3, the second economizer 15, the plate pressing machine 10 and the circulating water pump 9 are communicated through a circulating hot water pipeline to form closed loop circulation; the boiler 1, the first economizer 3, the second economizer 15 and the boiler induced draft fan 5 are sequentially communicated through a flue gas pipeline;
the labyrinth type hot blast stove 16 is communicated with the drying kiln 13 through a hot blast stove induced draft fan 17 and a hot blast pipeline;
the boiler induced draft fan 5 is communicated with an air inlet of the labyrinth type hot blast stove 16 through a flue gas pipeline.
Further, the drying kiln comprises an exhaust hood 18 and an unpowered natural exhaust pipe 19 communicated with the exhaust hood 18, wherein the exhaust hood 18 is arranged on an exhaust outlet of the drying kiln 13.
Further, a hot blast stove blower 20 is included, and the hot blast stove blower 20 is communicated with an air inlet of the labyrinth hot blast stove 16 through a cold air pipeline.
As shown in fig. 1, the flue gas flow of the prior art is: the fuel enters the boiler 1 from the boiler fuel inlet 14, burns under the blowing of the boiler blower 2, and the flue gas enters the first economizer 3 to recycle the waste heat after passing through the boiler 1 for heat exchange, then enters the dust remover 4 for dust removal, and enters the chimney 6 for being discharged into the atmosphere under the suction of the boiler induced draft fan 5.
The heat supply flow is as follows: the steam generated by the boiler 1 is divided into three paths, and one path directly enters the carbonization machine 7 for carbonization; one path of the hot water enters a steam-water heat exchanger 8 to heat the hot water, and the circulating hot water is pumped into a plate pressing machine 10 by a circulating water pump 9 to press plates and then returns to the steam-water heat exchanger 8 to be circularly heated; the third path enters a steam-air heat exchanger 11 to heat hot air, and the hot air is sent into a drying kiln 13 by a hot air fan 12 to be dried, and the dried residual air is naturally discharged into the environment atmosphere.
As shown in fig. 2, the heating flow of this embodiment is as follows:
the steam produced by the boiler 1 is directly sent to a carbonization machine 7 for carbonization.
Circulating hot water produced by the two-stage serial connection economizer of the first economizer 3 and the second economizer 15 is pumped into the pressing plate machine 10 by the circulating water pump 9 to be pressed and then returned to the two-stage serial connection economizer for circulating heating;
the boiler flue gas flow is as follows: fuel enters the boiler 1 from a boiler fuel inlet 14, is combusted under the blowing of a boiler blower 2, enters a first economizer 3 and a newly added second economizer 15 after the flue gas exchanges heat through the boiler 1 to heat circulating hot water, and then enters a labyrinth hot blast stove 16 to be mixed with hot air produced by the hot blast stove under the suction of a boiler induced draft fan 5;
the hot air drying process comprises the following steps: the fuel enters the labyrinth type hot air furnace 16 from the hot air furnace fuel inlet 21, burns under the blast of the hot air furnace blower 20 to form hot air, and enters the drying kiln 13 for drying under the suction of the hot air furnace induced draft fan 17 after the natural sedimentation dust removal of the hot air is carried out through the labyrinth air chamber of the labyrinth type hot air furnace 16, and the residual air after drying is collected by the exhaust hood 18 and is discharged into the atmosphere through the unpowered natural exhaust pipe 19.
Taking Guangxi cortex Cinnamomi Lin Mou year 1.2 ten thousand ton bamboo board processing plant as an example:
1. summary of the production flow
Raw bamboo-measuring-crushing-scraping-drying-carbonizing-fine grinding-pressing plate.
2. By heat conditions
And (3) a drying procedure: the hot air (heated by steam) as heating medium has inlet air temperature of 80-60 deg.C and outlet air temperature of 40 deg.C, heat accounting for 50% and running condition of 24 hr continuously.
Carbonization: the heating medium was saturated with steam and supplied at a pressure of 1.25Mp. The heat ratio is 25%, and the running state is on the shift.
Pressing plate working procedure: the heat supply medium circulates hot water (heated by steam), the temperature of the hot water is 200 ℃ at the highest, the temperature of the hot water is 90 ℃ at the lowest, the heat accounts for 25%, and the operating condition is on a shift.
3. Heating condition
Boiler conditions: the existing saturated steam boiler with the speed of 4t/h and 1.25Mp is provided with an economizer and a water film deduster, a fixed grate and manual ash removal (two-three-hopper car per month), and the exhaust temperature is more than or equal to 200 ℃.
Fuel conditions: the green bamboo yellow and fine grinding fine bamboo powder are used as fuel, the method is self-sufficient, the bark and the miscellaneous tree need to be purchased for two months during the bamboo shoot preservation period, the heating quantity of the bamboo is higher than that of the sawdust, the moisture content of the green bamboo yellow is about 20 percent according to the conservation calculation of 4000 kilocalories/kilogram of absolute dryness, and the moisture content of the fine bamboo powder is less than 8 percent, so that the fiber is too long to form clusters and easy to coke, a chamber combustion mode cannot be used, and only a layer combustion mode can be used.
Load conditions: the steam supply load of the boiler is 2-4 t/h.
4. Current situation analysis before optimizing heat supply technology improvement
A boiler:
the boiler has an economizer, no air preheater, the exhaust gas temperature is above 200 ℃, the heat loss is at least 16%, and the operation of other links is not fine, so that the total heat efficiency of the boiler is not higher than 70%. The electric consumption is not small even if there are water film dust remover, single blower and induced draft fan.
And (3) drying:
the drying kiln uses the most original steam-gas heat exchanger, condensed water is not recovered, so that the heat efficiency is reduced by at least 10%, and a drying fan (30 kw in total) with the speed of 3kw is arranged singly, so that at least 20 more electricity is consumed per hour.
And (3) pressing plates:
the pressing plate uses the most original steam-water heat exchanger, condensed water is not recovered, and the thermal efficiency is reduced by at least 10%.
And (3) running:
because the boiler worker is not trained in the aspect of energy conservation, the boiler runs at low pressure for a long time, and the temperature of the supplied saturated steam is very low, so that three heat utilization processes of drying, carbonization and pressing plates run at low load for a long time, the production period is prolonged, the power consumption and the heat consumption are directly increased, and the labor cost is also increased.
And (3) fine grinding:
because the labor protection facilities of the fine grinding process are imperfect, the fine bamboo powder is cleaned by the employer, thereby increasing the production cost.
5. The technical improvement scheme for optimizing heat supply is as follows:
5.1, reserving a boiler and an existing steam supply system;
5.2, disconnecting the existing first economizer 3 from the boiler 1, adding a first-stage steel pipe economizer, namely a second economizer 15, in series with the first economizer 3, reducing the exhaust gas temperature to 100 ℃, heating the hot water to 160 ℃, continuously using a hot water circulating pump 9, and dismantling a steam-water heat exchanger;
5.3, the water-cooled wall of the hearth of the boiler 1 is totally stuck by refractory concrete, and all convection heating surfaces of the boiler are reserved to produce steam;
5.4, adding a labyrinth type fixed grate 40 kilowatt-hour labyrinth type hot blast stove 16 (equivalent to a 0.6 ton boiler) for producing hot air, naturally settling and dedusting by a labyrinth type air chamber, and connecting smoke discharged from the boiler into the air chamber for dedusting by a boiler induced draft fan 5;
5.5, adding a 10000m table 3 The air quantity/h is taken as a hot blast stove blower 20 to burn and blow the labyrinth type hot blast stove 16.
5.6, an additional 35000-40000m 3 An ordinary boiler induced draft fan (with frequency conversion) with air quantity/h is used as a hot blast furnace induced draft fan 17 to intensively supply hot air for the existing drying process, and 10 manual air doors are arranged on 10 hot air branch pipes for control.
And 5.7, simply modifying an air inlet chamber at the top of the drying kiln 13, dismantling the steam-air heat exchanger 11 and the hot air fan 12, using galvanized iron sheet to make an exhaust hood 18 above the discharge end of the drying kiln 13, and making an exhaust pipe to extend out of a roof unpowered natural exhaust pipe 19 to carry out unpowered natural exhaust.
And 5.8, adding a PLC control cabinet integrated control heating system.
5.9, effect after implementation:
the chimney, the water film dust remover, the steam-water heat exchanger and the steam-air heat exchanger are omitted.
The total heat efficiency is improved to more than 90 percent (at least doubled compared with the current situation).
The electricity consumption is reduced by 30 degrees per hour.
The waste produced in bamboo board processing can completely meet the fuel demand, and no fuel is required to be purchased during the bamboo shoot period.
The drying period is shortened to 2 days from the current 3 days, the pressing plate and carbonization period are also reduced,
the working environment is fundamentally solved (i.e. no dust exists on site), thereby establishing an demonstration enterprise of clean production, green production, energy conservation and emission reduction and recycling economy enterprises.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. An optimized heat supply method for bamboo board processing comprises
A boiler;
the first economizer, the dust remover, the boiler induced draft fan and the chimney are sequentially communicated with the boiler through the flue gas pipeline;
a steam-water heat exchanger and a steam-air heat exchanger which are communicated with the boiler through steam pipelines; the carbonization machine is communicated with the boiler through a steam pipeline;
the steam-water heat exchanger is communicated with the circulating water pump and the plate pressing machine through a hot water pipeline to form closed circulation;
the steam-gas heat exchanger is communicated with the drying kiln through a hot air pipeline;
it is characterized in that the method comprises the steps of,
removing the steam-water heat exchanger, the steam-air heat exchanger, the dust remover and the chimney;
a second economizer, a labyrinth type hot blast stove and a hot blast stove induced draft fan are additionally arranged,
the second economizer and the first economizer are connected in series to form a hot water heater with a pressing plate process, and the hot water heater directly heats the pressing plate by using the heat of the boiler flue gas;
the fuel of the maze hot blast stove is bamboo green, tabasheer and/or bamboo powder; the labyrinth type hot blast stove directly supplies hot air to the drying kiln through a hot blast stove induced draft fan;
the boiler induced draft fan is communicated with an air inlet of the labyrinth type hot blast stove through a flue gas pipeline;
the device comprises an exhaust hood and an unpowered natural exhaust pipe communicated with the exhaust hood, wherein the exhaust hood is arranged on an exhaust port of a drying kiln;
the hot blast stove comprises a hot blast stove blower, wherein the hot blast stove blower is communicated with an air inlet of the labyrinth hot blast stove through a cold air pipeline;
the first economizer, the second economizer, the plate pressing machine and the circulating water pump are communicated through a circulating hot water pipeline to form closed loop circulation; the boiler, the first economizer, the second economizer and the boiler induced draft fan are sequentially communicated through a flue gas pipeline.
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| CN110625725A (en) | 2019-12-31 |
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