CN214791157U - Vertical double-row multistage spiral pipe sludge pyrolysis carbonization heating furnace - Google Patents
Vertical double-row multistage spiral pipe sludge pyrolysis carbonization heating furnace Download PDFInfo
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- CN214791157U CN214791157U CN202120346703.5U CN202120346703U CN214791157U CN 214791157 U CN214791157 U CN 214791157U CN 202120346703 U CN202120346703 U CN 202120346703U CN 214791157 U CN214791157 U CN 214791157U
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Abstract
The utility model discloses a vertical double-row multistage spiral pipe mud pyrolysis carbonization heating furnace, structural connection flue including air preheating heating furnace, mud carbonization heating furnace and connection mud carbonization heating furnace and reburning stove, its characterized in that the multistage auger delivery pipe of mud carbonization heating furnace adopts the biserial to arrange, compares with current single-row multistage spiral pipe mud pyrolysis carbonization heating furnace, the utility model has the advantages of the handling capacity is big, compact structure, under the condition of same handling capacity, corollary equipment (like air preheating heating furnace, flue gas reburning heating furnace etc.) is small in quantity, and the system heat loss is little, compares in prior art can effectively reduce treatment cost.
Description
Technical Field
Industrial and municipal sludge reduction and resource treatment. In particular to a vertical double-row multi-section spiral pipe sludge pyrolysis carbonization heating furnace.
Background
In recent years, with the continuous enhancement of sewage treatment strength in China, the scale of urban sewage treatment is steadily increased, and the sludge amount is synchronously and greatly increased. Meanwhile, domestic sludge also has the characteristics of large characteristic difference, complex components, low organic matter content, high heavy metal content, large sludge amount, high requirements on treatment technology and equipment and the like.
The technical guideline for sludge treatment and disposal in urban sewage treatment plants (trial) compiled by Ministry of construction and development and improvement committee indicates that the sludge pyrolysis technology is a technology for converting organic matters in sludge into fuel oil, fuel gas, sludge carbon and water by heating to a certain temperature under the anoxic condition. According to the difference of the pyrolysis temperature and the products of the sludge, the pyrolysis treatment technology of the sludge can be divided into three main categories, namely a sludge gasification technology, a sludge oiling technology and a sludge carbonization technology.
At present, a sludge carbonizing device mainly comprises a single-row multi-section spiral tube carbonizing furnace and a rotary kiln carbonizing furnace, wherein sludge is indirectly heated in a spiral conveyor. The speed of each spiral body is changed, the carbonization time is easy to adjust, and the vertically arranged multi-section spiral pipes enable the device to be compact and occupy less land than a rotary kiln carbonization furnace. Meanwhile, the single sludge conveying pipe of the multi-section spiral pipe carbonization furnace is short in length, the power of the driving motor is low, the surface area of the furnace body is small, so that the heat loss of the single-row multi-section spiral pipe carbonization furnace is greatly reduced compared with that of a rotary kiln carbonization furnace, and the rotary kiln carbonization furnace has the advantages of energy conservation and easiness in maintenance.
But the single-row multi-section spiral tube carbonization furnace has relatively small treatment capacity and is difficult to meet the requirement of centralized and mass sludge treatment in China. The utility model discloses to the not enough of domestic sludge treatment current situation and original carbonization process units, carry out brand-new research and development to mud carbonization process equipment, form one kind and be applicable to the extensive carbonization treatment of mud, carbonization treatment process safe and reliable, efficient sludge disposal process technique.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the defects of small treatment capacity, large system heat loss and high treatment cost of the existing single-row multi-section spiral pipe sludge pyrolysis carbonization heating furnace, and provides a vertical double-row multi-section spiral pipe sludge pyrolysis carbonization heating furnace with large treatment capacity and compact structure.
The utility model discloses a vertical biserial multistage spiral pipe mud pyrolysis carbonization heating furnace, structural including air preheating heating furnace, mud carbonization heating furnace and connect the mud carbonization heating furnace and the connection flue of reburning the stove, a serial communication port, the air preheating heating furnace is located mud carbonization heating furnace below and is equipped with the combustor, the combustor adopts the nozzle of integral type combustor or components of a whole that can function independently, and its fuel adopts natural gas, marsh gas, heavy oil etc, mud carbonization heating furnace is vertical biserial multistage screw conveyor tubular heating furnace, connect the flue and be located the top of mud carbonization heating furnace to be provided with the explosion vent at connecting the flue top, when flue gas and combustible gas discharge are not smooth in the stove, the furnace pressure risees, backs down the explosion vent, guarantees the safe operation of mud carbonization heating furnace.
Preferably, a plurality of sections of spiral conveying pipes are arranged in the sludge carbonization heating furnace, the spiral conveying pipes are sequentially arranged from top to bottom, the conveying directions of two sections of spiral conveying pipes which are adjacent from top to bottom are opposite, a discharge port of the spiral conveying pipe above and a feed port of the spiral conveying pipe below the spiral conveying pipe adjacent to the discharge port are provided with headers allowing sludge to pass through, and the feed port of the spiral conveying pipe arranged at the top and the discharge port of the spiral conveying pipe arranged at the bottom extend out of the furnace body of the sludge carbonization heating furnace.
Preferably, the spiral conveying pipe in the sludge carbonization heating furnace is arranged in double rows, so that the sludge treatment capacity can be doubled, the structure is more compact, the double rows can reduce the number of matched equipment (such as an air preheating heating furnace, a flue gas reburning heating furnace and the like) in the same treatment capacity, the system loss is less, additional high-quality fuel can be saved, the operation and maintenance are simpler, and the treatment cost is reduced.
Preferably, the feeding port of the uppermost spiral conveying pipe and the discharging port of the lowermost spiral conveying pipe in the sludge carbonization heating furnace are respectively provided with a related fan, so that the sludge pyrolysis gas can be prevented from escaping from the feeding port and the discharging port of the sludge.
Preferably, a header in the sludge carbonization heating furnace, which is connected with a discharge port of the upper spiral conveying pipe and a feed port of the lower spiral conveying pipe, is arranged in a heat insulation layer of a furnace body of the sludge carbonization heating furnace and is in direct contact with flue gas close to the inner side of the furnace, and the header is provided with an access hole for removing tar and ash attached to the header when the temperature is reduced in the process of stopping the sludge pyrolysis carbonization heating furnace.
Preferably, the sludge carbonization heating furnace is provided with a return flue gas access hole, low-temperature flue gas at about 200 ℃ after sludge drying is returned to the sludge carbonization heating furnace, and the temperature in the sludge carbonization heating furnace is controlled by adjusting the amount of the return flue gas; meanwhile, the lower oxygen content in the furnace is kept, and the concentration of nitrogen oxides in the flue gas discharged by the system is reduced.
Preferably, the sludge carbonization heating furnace is provided with a combustion-supporting air access hole, high-temperature combustible gas generated by sludge pyrolysis is fully combusted after meeting air, a heat source is provided for subsequent sludge pyrolysis carbonization, and the high-quality fuel consumption of the air preheating heating furnace is reduced.
Preferably, the discharge heat-insulating layer is arranged at the discharge section of the spiral conveying pipe of the sludge carbonization heating furnace, so that tar and ash in the sludge pyrolysis gas can be prevented from being cooled and solidified at the discharge section and being attached to the pipe wall; meanwhile, the scalding caused by the fact that operators touch the high-temperature spiral conveying pipe carelessly can be prevented.
Preferably, the sludge carbonization heating furnace is provided with an access door, an observation hole and a cleaning hole. The access door can be used for maintaining and cleaning the furnace when the furnace is stopped. The observation hole can know the pyrolysis carbonization operation condition of the sludge carbonization heating furnace during operation, can be matched with the cleaning hole, and cleans and maintains the accumulated dust and the accumulated carbon in the furnace by using a special cleaning tool under the condition of not stopping the furnace.
The utility model has the advantages that:
1. the sludge pyrolysis carbonization heating furnace is a vertical double-row multi-section spiral conveying pipe type heating furnace, and the multi-section spiral conveying pipes in the furnace are arranged in double rows. The double-row arrangement can improve the sludge treatment capacity by one time, and the structure is more compact. When the treatment capacity is the same, the double-row arrangement can reduce the number of matched equipment (such as an air preheating heating furnace, a flue gas reburning heating furnace and the like), the heat loss of the system is smaller, the additional high-quality fuel can be saved, the operation and maintenance are simpler, and the treatment cost is reduced.
2. Unique mud pyrolysis carbonization heating furnace structure and accessory part are favorable to sludge treatment equipment operation, maintenance and maintenance:
(1) a plurality of sections of spiral conveying pipes in the sludge carbonization heating furnace are arranged in sequence from top to bottom;
(2) the sludge inlet and outlet of the sludge carbonization heating furnace are respectively provided with a fan;
(3) a header is arranged between the multiple sections of spiral conveying pipes of the sludge carbonization heating furnace, and the header is arranged in a heat insulation layer of a furnace body of the sludge carbonization heating furnace and is directly contacted with the flue gas close to the inner side of the furnace; the connecting box is provided with a small access hole, so that tar and ash attached to the connecting box when the temperature is reduced in the process of blowing out the sludge pyrolysis carbonization furnace can be removed;
(4) a discharge heat-insulating layer is arranged at the discharge section of the spiral conveying pipe of the sludge carbonization heating furnace;
(5) the sludge carbonization heating furnace is provided with an access door, an observation hole, a cleaning hole, a backflow flue gas access hole and a combustion-supporting air access hole;
(6) an explosion door is arranged at the top of the flue connected with the upper part of the sludge pyrolysis carbonization furnace;
(7) the sludge carbonization heating furnace and the connecting flue are provided with expansion joints which can absorb the thermal expansion in the vertical direction.
Description of the drawings:
FIG. 1: combined diagram of vertical double-row multi-section spiral pipe sludge pyrolysis carbonization heating furnace, air preheating heating furnace and connecting flue
FIG. 2 and FIG. 3: respectively is a radial view and an axial view of a vertical double-row multi-section spiral pipe sludge pyrolysis carbonization heating furnace
FIG. 4, FIG. 5, FIG. 6: respectively is a partial view of a discharge heat-preservation layer, a header and a header access hole of a vertical double-row multi-section spiral pipe sludge pyrolysis carbonization heating furnace
The specific implementation mode is as follows:
the following describes in detail an exemplary embodiment of the present invention with reference to the accompanying drawings:
fig. 1 to 6 mark out: the device comprises an air preheating heating furnace 1, a sludge carbonization heating furnace 2, a connecting flue 3, an expansion joint 4, a fan 5, a spiral conveying pipe 6, a header 7, a header access hole 8, a burner 9, a discharge port heat-insulating layer 10, an explosion-proof door 11, an access door 12, an observation hole and cleaning hole 13, a backflow flue gas access hole 14 and a combustion-supporting air access hole 15.
In this embodiment, the sludge carbonization heating furnace 2 is used in combination with the air preheating heating furnace 1, the connecting flue 3, and the like.
The air preheating heating furnace 1 is provided with a burner 9, natural gas, methane, heavy oil and the like are used as fuels, the fuels are combusted to generate high-temperature flue gas, combustion-supporting air is heated, and a heat source is provided for pyrolysis and carbonization of sludge.
The sludge carbonization heating furnace 2 (see attached figures 2 and 3) is a vertical double-row multistage spiral conveying pipe type heating furnace, the interior of the furnace is vertically communicated by a plurality of stages of spiral conveying pipes 6, a header 7 is arranged between the plurality of stages of spiral conveying pipes 6, and sludge is sequentially transferred to the upper section, the middle section and the lower section by the sectional type spiral conveying pipes 6. The air preheating heating furnace 1 at the lower part of the carbonization furnace is combusted to generate the high temperature of 650-650 ℃, so that the shell of the spiral conveying pipe 6 of the carbonization heating furnace is heated to 450-650 ℃, and the dried sludge in the spiral conveying pipe 6 of the carbonization heating furnace is heated and decomposed in a low-oxygen state. Organic elements such as carbon, hydrogen, oxygen and nitrogen contained in the dried sludge are decomposed into combustible volatile gas by heat and precipitated. The main components of the combustible volatile gas are low molecular substances such as methane, ethane and ethylene, and high molecules such as tar and oil. Combustible volatile gas escapes from the spiral conveying pipe 6 and is combusted in a hearth of the high-temperature aerobic sludge carbonization heating furnace 2, and the combustible volatile gas can be used as a heat source for pyrolysis carbonization treatment of subsequent dry sludge in the sludge carbonization heating furnace 2.
After the sludge is heated in the sludge carbonization heating furnace 2, numerous holes are formed on the surface and inside due to the evaporation of water and the volatilization of decomposition gas. After further temperature rise, the organic components are continuously reduced, and finally carbide rich in fixed carbon is formed.
The discharge heat-insulating layer 10 is arranged at the discharge section of the spiral conveying pipe of the sludge carbonization heating furnace 2, so that tar and ash in the sludge pyrolysis gas can be prevented from being cooled and solidified and being attached to the pipe wall; meanwhile, the scalding caused by the fact that operators touch the high-temperature spiral conveying pipe carelessly can be prevented.
The sludge carbonization heating furnace 2 is provided with an access door 12, an observation hole and a cleaning hole 13. The access door 12 allows maintenance and cleaning of the furnace during furnace shut down. The observation hole can know the pyrolysis carbonization operation condition of the sludge carbonization heating furnace during operation, can be matched with the cleaning hole 13, and cleans and maintains the accumulated dust and the carbon deposit in the furnace by using a special cleaning tool under the condition of not stopping the furnace.
The sludge carbonization heating furnace 2 is provided with a return flue gas access hole 14, low-temperature flue gas which is discharged by the sludge drying device and is about 200 ℃ is returned to the sludge carbonization heating furnace 2, and the temperature in the sludge carbonization heating furnace is controlled by adjusting the amount of the return flue gas; meanwhile, the lower oxygen content in the furnace is kept, and the concentration of nitrogen oxides in the flue gas discharged by the system is reduced.
The sludge carbonization heating furnace 2 is provided with a combustion-supporting air access hole 15, high-temperature combustible gas generated by sludge pyrolysis fully burns after meeting air, a heat source is provided for subsequent sludge pyrolysis carbonization, and the high-quality fuel consumption of the air preheating heating furnace is reduced.
An expansion joint 4 is arranged at the joint of the sludge carbonization heating furnace 2 and the connecting flue 3 and can absorb the thermal expansion in the vertical direction.
The top of the upper part of the sludge carbonization heating furnace 2, which is connected with the flue 3, is provided with an explosion vent 11, when the smoke and combustible gas in the furnace are not discharged smoothly, the pressure in the furnace rises, the explosion vent is jacked open, and the safe operation of the sludge carbonization heating furnace is ensured.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims.
Claims (6)
1. The utility model provides a vertical biserial multistage spiral pipe mud pyrolysis carbonization heating furnace, structurally includes air preheating heating furnace, mud carbonization heating furnace and connects the connection flue of mud carbonization heating furnace and reburning stove, a serial communication port, the air preheating heating furnace is located mud carbonization heating furnace below and is equipped with the combustor, the combustor adopts the nozzle of integral type combustor or components of a whole that can function independently, can adopt natural gas, marsh gas, heavy oil as fuel, mud carbonization heating furnace is vertical biserial multistage screw conveyor tubular heating furnace, connect the flue and be located the top of mud carbonization heating furnace to be provided with explosion vent at connecting the flue top.
2. The vertical double-row multi-section spiral tube sludge pyrolysis carbonization heating furnace according to claim 1, wherein a plurality of sections of spiral conveying pipes are arranged in the sludge carbonization heating furnace, the spiral conveying pipes are arranged in sequence from top to bottom, the conveying directions of two sections of spiral conveying pipes adjacent to each other are opposite, a discharge port of an upper spiral conveying pipe and a feed port of a spiral conveying pipe below the upper spiral conveying pipe are provided with headers allowing sludge to pass through, and the feed port of the spiral conveying pipe arranged at the top and the discharge port of the spiral conveying pipe arranged at the bottom extend out of the furnace body of the sludge carbonization heating furnace.
3. The vertical double-row multi-section spiral tube sludge pyrolysis carbonization heating furnace of claim 2, wherein the spiral conveying pipes in the sludge carbonization heating furnace are arranged in double rows.
4. The vertical double row multi-section spiral tube sludge pyrolysis carbonization heating furnace as claimed in claim 2, wherein the inlet of the uppermost spiral duct and the outlet of the lowermost spiral duct in the sludge carbonization heating furnace are provided with respective fans.
5. The vertical double-row multi-section spiral pipe sludge pyrolysis carbonization heating furnace as claimed in claim 2, wherein the header is used for connecting the discharge port of the upper spiral conveying pipe and the feed port of the lower spiral conveying pipe, is arranged in the heat preservation layer of the sludge carbonization heating furnace body, is in direct contact with the flue gas near the inner side of the furnace, and is provided with an access hole for removing tar and ash attached to the header.
6. The vertical double-row multi-section spiral tube sludge pyrolysis carbonization heating furnace as claimed in claim 1, wherein the sludge carbonization heating furnace is provided with a return flue gas access hole and a combustion air access hole, and the temperature and oxygen content in the sludge carbonization furnace are stabilized in a proper range by controlling the access amount of the low-temperature return flue gas and the combustion air at about 200 ℃ after drying the sludge, so that the high-temperature combustible gas generated by sludge pyrolysis can be fully combusted, and the concentration of nitrogen oxides in the discharged flue gas is reduced.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120346703.5U CN214791157U (en) | 2021-02-08 | 2021-02-08 | Vertical double-row multistage spiral pipe sludge pyrolysis carbonization heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120346703.5U CN214791157U (en) | 2021-02-08 | 2021-02-08 | Vertical double-row multistage spiral pipe sludge pyrolysis carbonization heating furnace |
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| CN214791157U true CN214791157U (en) | 2021-11-19 |
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| CN202120346703.5U Active CN214791157U (en) | 2021-02-08 | 2021-02-08 | Vertical double-row multistage spiral pipe sludge pyrolysis carbonization heating furnace |
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