CN114453398A - System for utilize direct organic waste pyrolysis carbomorphism of circulation flue gas - Google Patents
System for utilize direct organic waste pyrolysis carbomorphism of circulation flue gas Download PDFInfo
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- CN114453398A CN114453398A CN202111504278.9A CN202111504278A CN114453398A CN 114453398 A CN114453398 A CN 114453398A CN 202111504278 A CN202111504278 A CN 202111504278A CN 114453398 A CN114453398 A CN 114453398A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 304
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 302
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 84
- 239000010815 organic waste Substances 0.000 title claims abstract description 21
- 239000011261 inert gas Substances 0.000 claims abstract description 39
- 238000003303 reheating Methods 0.000 claims abstract description 36
- 238000000746 purification Methods 0.000 claims abstract description 23
- 230000001502 supplementing effect Effects 0.000 claims abstract description 13
- 238000003763 carbonization Methods 0.000 claims abstract description 12
- 238000010000 carbonizing Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 20
- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- 239000001301 oxygen Substances 0.000 claims description 20
- 238000004064 recycling Methods 0.000 claims description 20
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- 239000000779 smoke Substances 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
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- 238000002485 combustion reaction Methods 0.000 claims description 5
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
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- 238000009270 solid waste treatment Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
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Abstract
The invention discloses a system for directly pyrolyzing and carbonizing organic waste by utilizing circulating flue gas, which comprises a pyrolysis reactor main body, a flue gas circulating reheating system, a flue gas circulating air supply system, a flue gas purifying system, a flue gas filtering device and an inert gas supplementing system, wherein the flue gas circulating air supply system is connected with the pyrolysis reactor main body; the circularly reheated flue gas is sent into a pyrolysis reactor and contacts with reaction materials to heat the materials so as to carry out pyrolysis carbonization reaction on the materials. The residual flue gas except the circulating flue gas is purified by the flue gas purification system, so that the pollution of the reaction flue gas to the environment is reduced. The invention can effectively solve the mechanical problems of low efficiency of indirect heating pyrolysis of organic solid wastes, corrosion of reactor materials, limited temperature of the reactor and the like, and can effectively control the uniformity of the temperature in the furnace and the pyrolysis effect.
Description
Technical Field
The invention belongs to the field of organic solid waste treatment, and particularly relates to a garbage pyrolysis carbonization technology in a flue gas circulating reheating mode.
Background
In recent years, as the living standard of people is greatly improved, various related industries are rapidly developed, for example, the petrochemical industry meets the requirements of people on substances consumed by people, and simultaneously generates a large amount of organic solid wastes, so that the environment is seriously polluted, and how to treat the organic solid wastes is urgent. The prior incineration technology is widely applied to organic solid waste treatment due to the characteristics of obvious reduction, thorough organic waste treatment and the like; however, due to the fact that the ash content in the incineration process is large, toxic and harmful gases such as dioxin and the like can be generated in the incineration process, the tail gas treatment system in the incineration process is large, the tail gas treatment cost is high, and the like; in the aspect of organic waste treatment, people gradually turn to the pyrolysis treatment technology that the generated dust content is less, harmful gases such as dioxin and the like are not generated in the heat treatment process, and a tail gas treatment system is relatively simple.
The pyrolysis technology of garbage refers to a process of converting organic matters in the garbage into low molecular substances such as charcoal, liquid and gas by thermochemical conversion under the condition of isolating air or supplying a small amount of air. The pyrolysis technology is divided into low-temperature pyrolysis (the temperature is less than or equal to 600 ℃), medium-temperature pyrolysis (the temperature is less than or equal to 1000 ℃) and high-temperature pyrolysis (the temperature is more than 1000 ℃), different pyrolysis temperatures are adopted for obtaining different products, an indirect pyrolysis furnace is mostly adopted in the market at present for treating organic waste, and the furnace type is faced with the following problems at present:
(1) the indirect pyrolysis furnace needs an external heat source medium (such as high-temperature flue gas) to indirectly exchange heat through the inner surface of the furnace body, and the heat efficiency is low.
(2) The indirect pyrolysis oven inner barrel considers the heat conduction problem, and the inner barrel material is mostly heat-resistant steel, and the material price is expensive relatively.
(3) The temperature range in the indirect pyrolysis furnace is not uniform and is difficult to control.
(4) The pyrolysis material has complex components, contains various corrosive elements such as sulfur, chlorine and the like in the material, is in direct contact with the inner cylinder of the indirect pyrolysis furnace in the pyrolysis process, has large corrosion to the inner cylinder material, and influences the service life and the operation safety of equipment.
Disclosure of Invention
Aiming at the problems, the invention provides a process system for directly pyrolyzing and gasifying organic wastes by using circulating flue gas, which adopts the circulating flue gas as a pyrolysis gas source, effectively reduces the input quantity of an inert gas source, reduces the power consumption for processing by the process system, and effectively reduces the carbon emission of the system. Meanwhile, the system adopts a process of directly carbonizing and pyrolyzing organic solid wastes by pyrolyzing high-temperature flue gas, so that the formation of harmful substances such as dioxin, sulfur dioxide, hexavalent chromium and the like can be effectively inhibited; the traditional pyrolysis equipment is changed to indirectly heat the materials in a heat conduction or radiation heating mode, and the materials are heated in a heat transfer mode combining a convection heat transfer mode with higher heat transfer efficiency and a radiation mode, so that the heat transfer efficiency of pyrolysis and gasification is improved, and the energy utilization rate is improved; the process adopts a direct heating mode, does not need to make requirements on the heat conduction of the inner cylinder of the pyrolysis furnace, can adopt wider inorganic high-temperature-resistant and corrosion-resistant materials as the materials of the pyrolysis furnace, and solves the problems of high cost and difficult material selection of heat conduction materials of the indirect pyrolysis furnace.
The invention relates to a system for directly pyrolyzing and carbonizing organic waste by utilizing circulating flue gas, which comprises a feeding system, a pyrolysis reactor, a third flue gas pipeline, a flue gas recycling system, a first flue gas pipeline, a flue gas purification system and a second flue gas pipeline; the feeding system is connected with the pyrolysis reactor; pyrolysis reactor, third flue gas pipeline, flue gas cyclic utilization system and first flue gas pipeline connect gradually, and flue gas cyclic utilization system is connected with pyrolysis reactor through first flue gas pipeline, and first flue gas pipeline is used for carrying the pyrolysis reactor with circulating flue gas. A smoke distribution device is arranged on the third smoke pipeline, and one outlet end of the smoke distribution device is connected with the smoke purification system through the second smoke pipeline.
Further, the device also comprises an inert gas supplementing system and a seventh pipeline; and the inert gas supplementing system is connected with the flue gas recycling system through a seventh pipeline and is used for supplementing inert gas into the flue gas recycling system.
Further, an automatic regulating valve is also arranged on the third flue gas pipeline, is positioned between the flue gas distribution device and the flue gas recycling system, and controls the flow of the circulating flue gas by regulating the opening of a valve body of the automatic regulating valve; and the redundant flue gas enters a flue gas purification system.
Furthermore, at least one first thermometer is arranged in the pyrolysis furnace and used for detecting the pyrolysis temperature of the flue gas in the furnace, the first thermometer is linked with an automatic regulating valve on a third flue gas pipeline, and when the temperature in the pyrolysis reactor measured by the first thermometer is lower than a set value, the opening degree of the automatic regulating valve on the third flue gas pipeline is increased, and the circulation volume of the flue gas is increased; otherwise, the opening of the automatic regulating valve is reduced, and the smoke circulation volume is reduced.
Furthermore, set up one or more flue gas entry and first flue gas pipeline connection in the pyrolysis reactor, be provided with mixing device, wind distribution device and disturbance mechanism in the pyrolysis reactor, increase the contact of reheat flue gas and material, the reinforcing is to the pyrolysis carbomorphism effect of material.
Further, the flue gas recycling system comprises a dust remover, a fourth flue gas pipeline, a flue gas booster fan, a fifth flue gas pipeline and a flue gas reheating unit; the dust remover, the fourth flue gas pipeline, the flue gas booster fan, the fifth flue gas pipeline and the flue gas reheating unit are sequentially connected. The dust remover is used for catching dust particles in the carbonized circulating flue gas, so that the blockage of a pipeline and subsequent equipment is reduced, and the abrasion to a system fan is reduced. The flue gas booster fan is used for providing kinetic energy required by circulating flue gas and overcoming the flow resistance of the flue gas.
Further, the flue gas reheating unit comprises a flue gas reheating furnace and at least one burner; the flue gas reheating furnace comprises a furnace body, a flue gas inlet, a circulating flue gas outlet, an ash collecting hopper and an automatic air locking discharging device; the ignition end of the burner is positioned in the furnace body and is adjacent to the flue gas inlet, and the burner is used for assisting in burning the circulating flue gas entering from the flue gas inlet. The circulating flue gas outlet is connected with the first flue gas pipeline and used for discharging the heated circulating flue gas. The ash collecting hopper is positioned at the bottom of the furnace body, and the air locking discharging device is connected with the ash collecting hopper and positioned at the bottom of the ash collecting hopper for automatically discharging ash.
Further, a second thermometer is arranged on the first flue gas pipeline, is adjacent to a circulating flue gas outlet of the flue gas reheating furnace and is used for detecting the temperature of the flue gas in the first flue gas pipeline; the combustor is interlocked with the second thermometer, and the temperature of the flue gas at the outlet of the flue gas reheating furnace is adjusted by adjusting the gas opening of the combustor.
Further, the flue gas purification system comprises an eighth flue gas pipeline of the flue gas purification treatment device, an induced draft fan and a chimney. The flue gas purification treatment device, the eighth flue gas pipeline, the induced draft fan and the chimney are connected in sequence.
Further, the inert gas supplementing system comprises an inert gas generator, a sixth flue gas pipeline and an inert gas booster fan; the inert gas booster fan is connected with the seventh pipeline, the other end of the seventh pipeline is connected with the fifth flue gas pipeline, and the flue gas flowing direction of the seventh pipeline and the fifth flue gas pipeline is an acute angle. The arrangement prevents the inert gas from blocking the circulating flue gas flow in the filling process to cause the flue gas pressure fluctuation of the system.
Furthermore, a second automatic regulating valve is arranged on the seventh pipeline, and an oxygen analyzer is further arranged on the first flue gas pipeline between the flue gas reheating unit and the pyrolysis reactor and used for measuring the oxygen concentration in the flue gas.
And the inert gas booster fan is interlocked with the oxygen analyzer, and when the oxygen concentration measured by the oxygen analyzer is greater than or equal to a set threshold value, the second automatic regulating valve is regulated to supplement inert gas so as to control the oxygen content of the circulating flue gas to be in a range below the threshold value.
In general, compared with the prior art, the process flow of the invention has the following advantages:
(1) and partial waste heat in the circulating flue gas is recovered, and the consumption of auxiliary fuel is saved.
(2) The heat transfer efficiency in the pyrolysis furnace is improved, and the temperature utilization interval of the high-temperature carbonization flue gas is improved.
(3) The temperature in the pyrolysis furnace is uniform and is easy to control.
(4) The generation of harmful gases such as dioxin and the like in the pyrolysis furnace is controlled, and the flue gas purification treatment cost is reduced.
(5) The method is not limited by heat transfer materials, and high-temperature carbonization pyrolysis is realized.
In a word, the process flow of directly pyrolyzing the organic solid waste by the circulating flue gas can effectively improve the limitation of the high-temperature pyrolysis heat-conducting material in the pyrolysis process at the present stage, and save the manufacturing cost of equipment; the pyrolysis carbonization heat conduction efficiency is improved, and the purposes of energy conservation and emission reduction are achieved; solves the problem of corrosion of the material to the inner surface of the pyrolysis furnace, improves the stability and safety of the equipment, and has great technical advantages.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic view of a flue gas reheating furnace according to the present invention and a sectional view taken along line A-A.
Wherein 1: a flue gas reheating unit; 2: a burner; 3: a pyrolysis furnace; 4: a dust remover; 5: a flue gas booster fan; 6: an inert gas generator; 7: an inert gas booster fan; 9: a flue gas purification treatment device; 10: an induced draft fan; 11: a second thermometer; 12: an oxygen analyzer; 13: a feed system; 31: a first thermometer; 32: a manometer; 33: a first self-regulating valve;
101: a circulating flue gas inlet; 102: a circulating flue gas outlet; 103: a dust collecting hopper; 104: an air locking discharging device; 105: a furnace body.
801: a first flue gas line; 802: a second flue gas line; 803: a third flue gas line; 804: a fourth flue gas line; 805: a fifth flue gas line; 806: a sixth flue gas line; 807: a seventh line; 808: an eighth flue gas line.
Detailed Description
In order to make the innovative points and the process systems of the present invention more clearly revealed, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiment is only for better showing the specific implementation process of the present invention, and is not limited to the present invention.
A system for directly pyrolyzing and carbonizing organic waste by utilizing circulating flue gas comprises a feeding system 13, a pyrolysis furnace 3, a third flue gas pipeline 803, a flue gas purification system, a second flue gas pipeline 802, a flue gas recycling system, a first flue gas pipeline 801, an inert gas supplementing system and a seventh pipeline 807.
The feeding system 13 is connected with the pyrolysis furnace 3, the third flue gas pipeline 803, the flue gas recycling system and the first flue gas pipeline 801 are sequentially connected, the flue gas recycling system is connected with the pyrolysis furnace 3 through the first flue gas pipeline 801, and the first flue gas pipeline 801 is used for conveying circulating flue gas to the pyrolysis furnace 3. The inert gas supplementing system is connected with the flue gas recycling system through a seventh pipeline 807, and is used for supplementing inert gas into the flue gas recycling system.
The feed system 13 is used to pre-treat and transport organic waste to the pyrolysis furnace 3.
The pyrolysis furnace 3 is used for contacting the high-temperature flue gas with the organic garbage to realize carbonization and pyrolysis of the garbage. The pyrolysis furnace 3 is provided with a high-temperature flue gas inlet, a carbonization flue gas outlet and an organic garbage inlet, the organic garbage inlet and the high-temperature flue gas inlet can be arranged at one end of the carbonization furnace, and can also be arranged at two ends of the carbonization furnace separately, and the high-temperature flue gas inlet and the carbonization flue gas outlet are separately arranged to be suitable. The feeding system 13 puts the organic garbage into the pyrolysis furnace 3 through the organic garbage inlet, the flue gas recycling system sends the circulating flue gas into the pyrolysis furnace 3 through the first flue gas pipeline 801 and the high-temperature flue gas inlet of the pyrolysis furnace 3, the high-temperature flue gas directly contacts with the organic garbage, and the organic garbage is rapidly heated to the specified temperature.
At least one first thermometer 31 is arranged in the pyrolysis furnace 3 and used for detecting the pyrolysis temperature of the flue gas in the furnace, so that the pyrolysis effect is ensured. The pyrolysis reactor flue gas outlet is provided with a pressure gauge 32 for measuring the outlet pressure.
The carbonization flue gas outlet of the pyrolysis furnace 3 is connected with a third flue gas pipeline 803, a flue gas distribution device is arranged on the third flue gas pipeline 803, and one outlet end of the flue gas distribution device is connected with a flue gas purification system through a second flue gas pipeline 802. A first automatic regulating valve 33 is further arranged on the third flue gas pipeline 803, the first automatic regulating valve 33 is positioned between the flue gas distribution device and the flue gas recycling system, and the first automatic regulating valve 33 regulates the opening of the valve body pneumatically or electrically so as to control the flow of the circulating flue gas; and the redundant flue gas enters a flue gas purification system. The first thermometer 31 is interlocked with the first automatic regulating valve 33 on the third flue gas pipeline 803, when the temperature in the pyrolysis furnace 3 measured by the first thermometer 31 is lower than a set value, the opening degree of the first automatic regulating valve 33 on the third flue gas pipeline 803 is increased, the circulation amount of flue gas is increased, and the heat supply amount of the pyrolysis furnace 3 is increased; conversely, the opening degree of the first automatic regulating valve 33 is reduced, and the smoke circulation volume is reduced.
The flue gas recycling system comprises a dust remover 4, a fourth flue gas pipeline 804, a flue gas booster fan 5, a fifth flue gas pipeline 805 and a flue gas reheating unit 1; the dust remover 4, the fourth flue gas pipeline 804, the flue gas booster fan 5, the fifth flue gas pipeline 805 and the flue gas reheating unit 1 are connected in sequence.
The dust remover 4 is connected with the flue gas distribution device and is used for removing dust from the circulating flue gas, and the dust remover 4 can be a cyclone dust remover, a bag-type dust remover and the like, but is not limited to the two forms. The circulating flue gas after dust removal enters the flue gas booster fan 5 through the fourth flue gas pipeline 804, enters the flue gas reheating unit 1 through the fifth flue gas pipeline 805 after being boosted, and heats the circulating flue gas, the flue gas reheating unit 1 is connected with the pyrolysis furnace 3 through the first flue gas pipeline 801, and the heated circulating flue gas is sent to the pyrolysis furnace 3.
The flue gas reheating unit 1 is used for combusting auxiliary energy to heat the low-temperature circulating flue gas to a set temperature, a second thermometer 11 is further arranged on the first flue gas pipeline 801, the second thermometer 11 is adjacent to the flue gas reheating unit 1, and for example, the temperature of the second thermometer 11 on the first flue gas pipeline 801 is set to be 550 ℃.
The flue gas reheating unit 1 includes a flue gas reheating furnace and a burner 2. The combustor 2 is used for converting internal energy in the auxiliary fuel into heat energy in the high-temperature flue gas in a combustion mode, and the flue gas reheating furnace 1 is used for heating the circulating flue gas to a set temperature in a mode of mixing the circulating flue gas with the high-temperature flue gas generated by the combustor 2.
The flue gas reheating furnace comprises a furnace body 105, a circulating flue gas inlet 101, a circulating flue gas outlet 102, an ash collecting hopper 103 and an automatic air locking discharging device 104; the ignition end of the burner 2 is located in the furnace body 105 and adjacent to the circulating flue gas inlet 101 for assisting combustion of the circulating flue gas entering through the circulating flue gas inlet 101. The ash collecting hopper 103 is positioned at the bottom of the furnace body 105, and the air locking discharging device 104 is connected with the ash collecting hopper 103 and positioned at the bottom of the ash collecting hopper 103 and used for automatically discharging ash.
The flue gas reheating furnace 1 can be arranged horizontally or vertically, and a heat-insulating refractory material is arranged in the flue gas reheating furnace and used for insulating the furnace body 105 and reducing heat dissipation of energy.
Circulating flue gas tangentially enters the flue gas reheating furnace body 105 from the circulating flue gas inlet 101, the circulating flue gas contains a large amount of organic gas, the circulating flue gas is combusted under the assistance of a combustor, and on the other hand, the circulating flue gas and the flue gas generated by the combustion of auxiliary fuel are heated to the set temperature of 550 ℃ together by a large amount of heat energy generated by auxiliary combustion. The burner 2 is interlocked with the second thermometer 11, and is mainly used for adjusting the temperature of the flue gas at the flue gas outlet of the flue gas reheating furnace by adjusting the opening degree of the burner 2 to control the air/fuel ratio, so that the second thermometer 11 is stabilized at about 550 ℃.
The flue gas purification system comprises a flue gas purification treatment device 9, an eighth flue gas pipeline 808, an induced draft fan 10 and a chimney. The flue gas purification treatment device 9, the eighth flue gas pipeline 808, the induced draft fan 10 and the chimney are connected in sequence. The flue gas distributed by the flue gas distribution device reaches the flue gas purification treatment device 9, is purified and then reaches the induced draft fan 10 through the eighth flue gas pipeline 808, and is discharged into the environment through the chimney. The tail gas purification treatment device has the functions of waste heat recovery, desulfurization, dust removal and the like, and is used for purifying the carbonized flue gas.
The induced draft fan 10 is used to overcome the resistance required for the flow of flue gas.
The inert gas supplementing system comprises an inert gas generator 6, a sixth flue gas pipeline 806 and an inert gas booster fan 7, wherein the inert gas generator 6, the sixth flue gas pipeline 80 and the inert gas booster fan 7 are sequentially connected, the inert gas booster fan 7 is connected with a seventh pipeline 807, the other end of the seventh pipeline 807 is connected with the fifth flue gas pipeline 805, and the flue gas flowing direction of the seventh pipeline 807 and the fifth flue gas pipeline 805 form an acute angle, for example, an included angle of 30 degrees. The inert gas reaches the inert gas booster fan 7 through a sixth flue gas line 806, and is sent to the flue gas reheating unit 1 through a seventh line 807 and a fifth flue gas line 805 after being boosted.
The inert gas generator 6 is a nitrogen generator and can be in the form of a pressure swing adsorption nitrogen making machine or a nitrogen storage tank and the like.
A second automatic regulating valve is arranged on the seventh pipeline 807, and an oxygen analyzer 12 is further arranged on the first flue gas pipeline 801 between the flue gas reheating unit 1 and the pyrolysis furnace 3, and is used for measuring the oxygen concentration in the flue gas.
During operation, the inert gas booster fan 7 is interlocked with the oxygen analyzer 12, when the oxygen concentration in the oxygen analyzer 12 is more than or equal to 1%, the oxygen content of the circulating flue gas is controlled to be below 1% by supplementing inert gas, so that the oxygen concentration of the high-temperature flue gas entering the pyrolysis furnace 3 is not more than 1%, the pyrolysis effect of organic waste in the pyrolysis furnace 3 is ensured, and the generation of harmful atmosphere in the furnace is inhibited.
In this embodiment, the first flue gas pipeline 801 to the fifth flue gas pipeline 805 are all provided with a 50 mm-100 mm fireproof heat preservation cotton heat preservation measure, so that the outer surface temperature of the pipeline heat preservation layer is not higher than the ambient temperature by 30 ℃.
The foregoing is merely a preferred embodiment of the present invention, and it should be understood that any modification, simplification, replacement, etc. without departing from the principle and principle of the invention should be considered within the protection scope of the present invention.
Claims (10)
1. A system for directly pyrolyzing and carbonizing organic waste by using circulating flue gas is characterized by comprising a feeding system (13), a pyrolysis furnace (3), a third flue gas pipeline (803), a flue gas recycling system, a first flue gas pipeline (101), a flue gas purification system and a second flue gas pipeline (102);
the feeding system (13) is connected with the pyrolysis furnace (3);
the pyrolysis furnace (3), the third flue gas pipeline (803), the flue gas recycling system and the first flue gas pipeline (101) are sequentially connected, the flue gas recycling system is connected with the pyrolysis furnace (3) through the first flue gas pipeline (101), and the first flue gas pipeline (101) is used for conveying circulating flue gas to the pyrolysis furnace (3);
a smoke distribution device is arranged on the third smoke pipeline (803), and one outlet end of the smoke distribution device is connected with the smoke purification system through the second smoke pipeline (102).
2. The system for direct pyrolytic charring of organic wastes with recycled flue gas according to claim 1 further comprising an inert gas make-up system and a seventh line (807);
the inert gas supplementing system is connected with the flue gas recycling system through a seventh pipeline (807) and is used for supplementing inert gas into the flue gas recycling system.
3. The system for directly pyrolyzing and carbonizing organic waste by using circulating flue gas as claimed in claim 1, wherein a first automatic regulating valve (33) is further arranged on the third flue gas pipeline (803), the first automatic regulating valve (33) is positioned between the flue gas distribution device and the flue gas recycling system, and the flow of the circulating flue gas is controlled by regulating the opening degree of a valve body of the first automatic regulating valve (33); and the redundant flue gas enters a flue gas purification system.
4. The system for directly pyrolyzing and carbonizing organic waste by using circulating flue gas as claimed in claim 3, wherein at least one first thermometer (31) is arranged in the pyrolysis furnace (3) for detecting the pyrolysis temperature of the flue gas in the furnace, the first thermometer (31) is interlocked with a first automatic regulating valve (33) on a third flue gas pipeline (803), and when the temperature in the pyrolysis furnace (3) detected by the first thermometer (31) is lower than a set value, the opening degree of the first automatic regulating valve (33) on the third flue gas pipeline (803) is increased to increase the circulating amount of the flue gas; conversely, the opening degree of the first automatic regulating valve (33) is reduced, and the smoke circulation volume is reduced.
5. The system for directly pyrolyzing and carbonizing organic waste by using the circulating flue gas as claimed in claim 1, wherein the flue gas recycling system comprises a dust remover (4), a fourth flue gas pipeline (804), a flue gas booster fan (5), a fifth flue gas pipeline (805) and a flue gas reheating unit (1); the dust remover (4), the fourth flue gas pipeline (804), the flue gas booster fan (5), the fifth flue gas pipeline (805) and the flue gas reheating unit (1) are connected in sequence.
6. The system for directly pyrolysing and carbonizing organic waste with recycled flue gas according to claim 1, characterized in that the flue gas reheating unit (1) comprises a flue gas reheating furnace and at least one burner (2);
the flue gas reheating furnace comprises a furnace body (105), a circulating flue gas inlet (101), a circulating flue gas outlet (102), an ash collecting hopper (103) and an air locking discharging device (104); the ignition end of the burner (2) is positioned in the furnace body (105) and is adjacent to the circulating flue gas inlet (101) and is used for assisting the combustion of the circulating flue gas entering from the circulating flue gas inlet (101); the circulating flue gas outlet (102) is connected with the first flue gas pipeline (101) and used for discharging the heated circulating flue gas, the ash collecting hopper (103) is positioned at the bottom of the furnace body (105), and the air locking discharging device (104) is connected with the ash collecting hopper (103) and positioned at the bottom of the ash collecting hopper (103).
7. A system for the direct pyrolysis and carbonization of organic waste by using the circulating flue gas as claimed in claim 6, wherein the first flue gas pipeline (101) is provided with a second thermometer (11), and the second thermometer (11) is adjacent to the circulating flue gas outlet (102) of the flue gas reheating furnace and is used for detecting the temperature of the flue gas in the first flue gas pipeline (101); the combustor (2) is interlocked with the second thermometer (11), and the temperature of the flue gas at the outlet of the flue gas reheating furnace is adjusted by adjusting the gas opening of the combustor.
8. The system for directly pyrolyzing and carbonizing organic waste by using the circulating flue gas as claimed in claim 1, wherein the flue gas purification system comprises a flue gas purification treatment device (9), an eighth flue gas pipeline (808), an induced draft fan (10) and a chimney; the flue gas purification treatment device (9), the eighth flue gas pipeline (808), the induced draft fan (10) and the chimney are connected in sequence.
9. The system for directly pyrolyzing and carbonizing organic waste by using the circulating flue gas as claimed in claim 2, wherein the inert gas supplementing system comprises an inert gas generator (6), a sixth flue gas pipeline (806), and an inert gas booster fan (7);
the inert gas generator (6), the sixth flue gas pipeline (806) and the inert gas booster fan (7) are sequentially connected, the inert gas booster fan (7) is connected with the fifth flue gas pipeline (805) through a seventh pipeline (807), and the flue gas flowing direction of the seventh pipeline (807) and the fifth flue gas pipeline (805) is an acute angle.
10. The system for directly pyrolyzing and carbonizing organic waste by using circulating flue gas as claimed in claim 2, wherein a second automatic regulating valve is arranged on a seventh pipeline (807), and an oxygen analyzer (12) is arranged on a first flue gas pipeline (101) between the flue gas reheating unit (1) and the pyrolysis furnace (3) and is used for measuring the oxygen concentration in the flue gas;
the inert gas booster fan (7) is interlocked with the oxygen analyzer (12), and when the oxygen concentration measured by the oxygen analyzer (12) is greater than or equal to a set threshold value, the second automatic regulating valve is regulated to supplement inert gas so as to control the oxygen content of the circulating flue gas to be in a range below the threshold value.
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