CN117447039A - Method and integrated equipment for treating municipal sludge by semi-carbonization coupling carbonization process - Google Patents
Method and integrated equipment for treating municipal sludge by semi-carbonization coupling carbonization process Download PDFInfo
- Publication number
- CN117447039A CN117447039A CN202210838664.XA CN202210838664A CN117447039A CN 117447039 A CN117447039 A CN 117447039A CN 202210838664 A CN202210838664 A CN 202210838664A CN 117447039 A CN117447039 A CN 117447039A
- Authority
- CN
- China
- Prior art keywords
- heat treatment
- heat
- supply source
- carbonization
- municipal sludge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003763 carbonization Methods 0.000 title claims abstract description 62
- 239000010802 sludge Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000008569 process Effects 0.000 title claims abstract description 23
- 230000008878 coupling Effects 0.000 title claims abstract description 19
- 238000010168 coupling process Methods 0.000 title claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 179
- 239000000428 dust Substances 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims description 113
- 238000000197 pyrolysis Methods 0.000 claims description 68
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 28
- 239000003546 flue gas Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000000779 smoke Substances 0.000 claims description 10
- 238000003795 desorption Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 238000001035 drying Methods 0.000 description 25
- 238000002485 combustion reaction Methods 0.000 description 12
- 230000006872 improvement Effects 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/02—Multi-step carbonising or coking processes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of municipal sludge treatment, and particularly relates to a method and integrated equipment for treating municipal sludge by a semi-carbonization coupling carbonization process. The integrated equipment comprises a first heat treatment furnace (10) which adopts direct heating and a second heat treatment furnace (20) which adopts jacket heating, wherein the second heat treatment furnace (20) is provided with a second heat supply source (21), the air inlet end of the first heat treatment furnace (10) is positioned at the discharge end of the second heat treatment furnace, the first heat treatment furnace (10) is provided with a first heat supply source (11), and the first heat supply source (11) is connected with the air inlet end of the first heat treatment furnace (10); the air outlet end of the first heat treatment furnace (10) is connected with the dry dedusting device (12), and the jacket of the second heat treatment furnace (20) is connected with the tail gas treatment device (22). According to the invention, the half carbonization concept is introduced, and the direct contact heating mode is used for realizing the partial carbonization of the material, so that the heat treatment efficiency is improved, and the dust removal efficiency of the gas is also improved.
Description
Technical Field
The invention belongs to the technical field of municipal sludge treatment, and particularly relates to a method and integrated equipment for treating municipal sludge by a semi-carbonization coupling carbonization process.
Background
Municipal sludge is an inevitable by-product in the municipal wastewater treatment process. In recent years, with the rapid increase in sewage treatment capacity, municipal sludge production has also increased dramatically. The sludge contains heavy metals, microorganisms and various other contaminants. The sludge treatment is improper, which can cause the secondary environmental problems of greenhouse gas emission, groundwater pollution, land pollution and the like. At present, municipal sludge drying pyrolysis carbonization technology is of great concern, and the technology has the advantages of high reduction degree, high heavy metal solidification ratio and the like.
The Chinese patent document CN107200458A discloses a municipal sludge treatment method, which comprises the steps of adopting a drying furnace and a pyrolysis carbonization furnace to carry out dehydration and pyrolysis carbonization treatment on municipal sludge, adopting a jacketed rotary furnace to carry out indirect heating on the drying furnace and the pyrolysis carbonization furnace, wherein the heating temperature of materials in the drying furnace is 100-150 ℃, and adopting auxiliary heating smoke generated by an auxiliary drying combustion furnace and pyrolysis furnace jacket smoke led out from a pyrolysis carbonization furnace heating jacket to carry out heat supply on the drying furnace; the pyrolysis carbonization furnace supplies heat through high-temperature heating smoke generated by the mixed combustion furnace. The pyrolysis carbonization furnace is provided with a pyrolysis gas discharge port, and the pyrolysis gas discharge port is used for sending pyrolysis gas generated in the furnace chamber of the pyrolysis carbonization furnace into the mixed combustion furnace for combustion so as to generate high-temperature heating smoke. The drying efficiency is relatively low due to the fact that the heating temperature in the drying furnace is relatively low and an indirect heating mode is adopted.
Chinese patent document CN214400194U discloses a municipal sludge drying pyrolysis carbonization system, and this system includes desiccation stove and pyrolysis carbonization stove, and desiccation stove and pyrolysis carbonization stove all adopt the heating jacket, are provided with desiccation gas delivery tube on the desiccation stove, and desiccation gas delivery tube connects gradually spray column, condenser, heat exchanger, and the heat transfer of desiccation gas and pyrolysis gas can be realized in pyrolysis gas delivery tube and heat exchanger intercommunication, and desiccation gas delivery tube divide into two branch roads that lead to combustion chamber and desiccation stove respectively behind the heat exchanger. The drying furnace adopts two modes of internal heating and external heating. The drying gas returns to the drying furnace again after spraying and heat exchange to realize partial circulation of the drying gas and internal heating. The high-temperature flue gas generated by the combustion chamber sequentially passes through jackets of the pyrolysis carbonization furnace and the drying furnace, so that external heating is realized. The scheme improves the drying efficiency in a drying gas internal circulation mode, is also beneficial to reducing the peculiar smell of a project site, represents a technical development trend, and increases the energy loss by a condensation and heat exchange process.
Disclosure of Invention
The invention aims to provide a method for treating municipal sludge by a semi-carbonization coupling carbonization process on the basis of the prior art, and the peculiar smell of a project site is reduced on the basis of further improving the heat treatment efficiency.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the municipal sludge is treated by a first heat treatment section and a second heat treatment section, the second heat treatment section is heated by a jacket, and a second heat supply source is arranged in the second heat treatment section to provide a heat source for the jacket:
(1) Controlling the water content of municipal sludge in the first heat treatment section to ensure that the water content of a feeding end is more than 60 percent and the water content of a discharging end is less than 30 percent;
(2) The air inlet end of the first heat treatment section is positioned at the discharge end of the first heat treatment section, the first heat treatment section is provided with a first heat supply source, heating smoke guided out by the first heat supply source enters the first heat treatment section from the air inlet end of the first heat treatment section and is in direct contact with municipal sludge, the movement direction of the heating smoke is opposite to the advancing direction of the municipal sludge, and the temperature of the heating smoke at the air inlet end is not less than 450 ℃ so that the municipal sludge is partially carbonized at the rear section of the first heat treatment section;
(3) Municipal sludge is led out from the first heat treatment section and enters the second heat treatment section, the municipal sludge is carbonized in the second heat treatment section, the second heat treatment section generates second pyrolysis gas, and the second pyrolysis gas is led into a second heat supply source and/or a first heat supply source for recycling;
(4) The first pyrolysis gas generated by the first heat treatment section is led out through the air outlet end of the first heat treatment section, the part of the first pyrolysis gas after dry dedusting is led to the first heat supply source so that part of the first pyrolysis gas forms circulation among the air outlet end of the first heat treatment section, the first heat supply source and the air inlet end of the first heat treatment section, and the part of the first pyrolysis gas is led to the second heat supply source so that part of the first pyrolysis gas is recycled through the second heat supply source and is discharged after being treated by tail gas along with the heating flue gas of the second heat treatment section.
The term "semi-carbonization" as used herein means: and in the rear section of the drying section with relatively low water content, the material is partially carbonized through direct contact of high-temperature flue gas.
Compared with the Chinese patent document CN214400194U, the main innovation point of the application is that:
(1) By increasing the temperature of the heating flue gas of the first heat treatment section, a partial carbonization is achieved in the first heat treatment section. On one hand, the drying efficiency of municipal sludge in the first heat treatment section is accelerated at high temperature, and on the other hand, the carbonization efficiency of the second heat treatment section is equivalently improved, and compared with the second heat treatment section which adopts a jacket indirect heating mode, the carbonization efficiency of the first heat treatment section in a direct heating mode is higher.
(2) The partial carbonization can decompose organic matters in partial drying gas, so that the viscosity of the drying gas is reduced, the influence of the viscosity of the drying gas on the dry dedusting stability is reduced, and the removal of particles or dust in the first pyrolysis gas is facilitated.
(3) The first pyrolysis gas only adopts dry dedusting, so that the water vapor content of the first pyrolysis gas is ensured, the specific heat capacity of the liquid is larger than that of the gas, and the heat storage performance of the first pyrolysis gas can be improved, thereby improving the efficiency of the first heat treatment section and reducing the equipment scale. If a spraying mode is adopted, a large amount of organic wastewater is generated, and high-temperature water vapor in the first pyrolysis gas is condensed when encountering cold, so that the heat storage performance of the first pyrolysis gas is reduced; secondly, organic wastewater is also an important source of off-site odors for projects.
(4) The first heat treatment section is provided with a first heat supply source, so that on one hand, the heating flue gas of the first heat treatment section is guaranteed to have a high enough temperature, and on the other hand, organic components in the circulating gas can be timely removed, and the heat energy of the organic components is fully utilized.
(5) The first pyrolysis gas part is led to the second heat supply source and then is discharged along with the heating flue gas of the second heat treatment section after being treated by tail gas, which is equivalent to transferring the water vapor separated out in the drying gas spraying stage in the scheme described in Chinese patent document CN214400194U to the separation in the tail gas treatment section, and at the moment, the organic matter in the tail gas has very low content through high-temperature oxidation, so that the generation of peculiar smell can be greatly reduced. And the content of water vapor in the tail gas is higher, so that the consumption of spray water can be reduced in the subsequent tail gas treatment.
As an improvement, at least 50% of the first pyrolysis gas is led to the first heat supply source, so that enough organic matters for combustion are ensured in the first heat supply source.
As an improvement, the temperature of the first pyrolysis gas when being led out from the gas outlet end of the first heat treatment section is not more than 300 ℃ so as to adapt to the requirement of the subsequent dry dedusting.
As an improvement, the temperature of the heating flue gas generated by the second heat supply source at the air inlet end of the jacket is not less than 850 ℃.
As an improvement, a bag-type dust remover is adopted in the step (4) for removing dust.
As an improvement, the dust outlet of the bag-type dust collector is communicated with the feeding end of the second heat treatment section.
As an improvement, the first pyrolysis gas in the step (4) is subjected to dust removal treatment and then exchanges heat with the tail gas of the heating flue gas led out of the jacket so as to raise the temperature of the first pyrolysis gas.
As an improvement, the first heat supply source and the second heat supply source are provided with combustion-supporting air, and the combustion-supporting air exchanges heat with the heating flue gas tail gas led out from the jacket to reduce the temperature of the heating flue gas tail gas.
As a modification, the tail gas treatment in the step (4) comprises deacidification treatment.
The invention also provides integrated equipment for treating municipal sludge by using the semi-carbonization coupling carbonization process, which comprises a first heat treatment furnace and a second heat treatment furnace, wherein the second heat treatment furnace is an indirect thermal desorption furnace heated by a jacket, the second heat treatment furnace is provided with a second heat supply source for providing a heat source for the jacket, the first heat treatment furnace is a direct thermal desorption furnace, the air inlet end of the first heat treatment furnace is positioned at the discharge end of the first heat treatment furnace, the first heat treatment furnace is provided with a first heat supply source, and the first heat supply source is connected with the air inlet end of the first heat treatment furnace; the gas outlet end of the first heat treatment furnace is connected with the dry dedusting device, the gas outlet end of the dry dedusting device is communicated with the first heat supply source and the second heat supply source, the jacket of the second heat treatment furnace is connected with the tail gas treatment device, and the pyrolysis gas outlet of the second heat treatment furnace is communicated with the second heat supply source and/or the first heat supply source.
As an improvement, the dust outlet of the dry dust removal device is communicated with the feeding end of the second heat treatment furnace.
As an improvement, a first heat exchanger for raising the temperature of the first pyrolysis gas generated by the first heat treatment furnace is arranged between the jacket of the second heat treatment furnace and the tail gas treatment device.
As an improvement, the tail gas treatment device comprises a deacidification tower provided with an alkali liquid pool.
In summary, the invention introduces the concept of half carbonization, realizes partial carbonization of materials by a direct contact heating mode, improves the heat treatment efficiency, and is also beneficial to improving the dust removal efficiency of gas. And meanwhile, spray washing is replaced by dry dedusting, so that the heat energy loss is reduced, and the peculiar smell of a project site is further reduced.
Drawings
FIG. 1 is a schematic diagram of the structure of the invention;
10. a first heat treatment furnace; 11. a first heat supply source; 12. a dry dust removal device; 20. a second heat treatment furnace; 21. a second heat supply source; 22. a tail gas treatment device; 30. a first heat exchanger; 40. a second heat exchanger; 50. and a fuel gas supply device.
Detailed Description
Example 1
As shown in FIG. 1, the integrated equipment for treating municipal sludge by using the semi-carbonization coupling carbonization process disclosed by the invention is mainly composed of a first heat treatment furnace 10 and a second heat treatment furnace 20. The first heat treatment furnace 10 is a direct thermal desorption furnace, the first heat treatment furnace 10 is provided with a first heat supply source 11, and the first heat supply source 11 is a drying hot blast furnace. The first heat supply source 11 is connected with the air inlet end of the first heat treatment furnace 10, the air inlet end of the first heat treatment furnace 10 is positioned at the discharge end of the first heat treatment furnace, and the air outlet end of the first heat treatment furnace 10 is connected with the dry dust removing device 12. The air outlet of the dry dust removal device 12 is connected to a first heat exchanger 30. The second heat treatment furnace 20 is an indirect thermal desorption furnace heated by a jacket, the second heat treatment furnace 20 is provided with a second heat supply source 21, and the second heat supply source 21 is a combustion chamber. The jacket of the second heat treatment furnace 20 is connected in sequence to the first heat exchanger 30, the second heat exchanger 40 and the exhaust gas treatment device 22. Further, the first heat treatment furnace 10 and the second heat treatment furnace 20 are provided with a gas supply device 50.
The heating flue gas led out of the first heat supply source 11 enters the first heat treatment furnace 10 from the air inlet end of the first heat treatment furnace 10 and is in direct countercurrent contact with municipal sludge. The municipal sludge has an initial water content of 75-85% at the feed end of the first heat treatment furnace 10 and a water content of 15-20% at the discharge end. The temperature of the heating flue gas at the air inlet end is 450-550 ℃ so that municipal sludge is partially carbonized at the rear section of the first heat treatment section.
Municipal sludge is partially carbonized from the first heat treatment furnace 10 and then is led into the second heat treatment furnace 20 for secondary complete carbonization. The secondary complete carbonization is performed in the second heat treatment furnace 20. The temperature of the heating flue gas generated by the second heat supply source 21 at the inlet end of the jacket is 850-950 ℃. And after the carbonization treatment is finished, discharging municipal sludge.
The first pyrolysis gas generated in the first heat treatment furnace 10 is subjected to dust fall treatment by the dry dust removing device 12. The dust removing device is a cloth bag dust remover. The temperature of the first pyrolysis gas when being led out from the gas outlet end of the first heat treatment furnace 10 is 200-230 ℃, and the water content is 60-70%. The particulate matters or dust generated in the dust removal process are transferred to the second heat treatment furnace 20 for harmless treatment. In the conventional dust removal process, as viscous organic matters exist in the first pyrolysis gas, the heat load of the flue gas is low, the temperature is easy to reduce in the circulating process, the dust removal efficiency generally begins to drop after the operation starts, tar-like substances are easy to adhere to the inner walls of the first pyrolysis gas pipeline and the fan, and the operation time can be generally maintained for only 1-2 weeks; the first heat treatment section adopts pyrolysis gas generated by semi-carbonization, the efficiency of the dust remover can be maintained for a long time to be more than 95% under the same condition, cleaning maintenance is not needed, and the first pyrolysis gas pipeline, the fan and the inside of the heat exchanger can be maintained for 3 months.
After the first pyrolysis gas is dedusted, heat exchange is performed between the first heat exchanger 30 and the heating flue gas tail gas in the jacket of the second heat treatment furnace 20. 70-80% of the first pyrolysis gas is distributed into the first heat supply source 11 for combustion, 20-30% of the first pyrolysis gas is distributed into the second heat supply source 21 for combustion, and water vapor is discharged.
The second pyrolysis gas generated in the second heat treatment furnace 20 is introduced into the second heat supply source 21 and is burned as fuel. The gas supplied from the gas supply device 50 is natural gas, and the amount of natural gas is adjusted to control the temperatures of the first heat supply source 11 and the second heat supply source 21.
The heat exchange is performed between the heating flue gas tail gas in the jacket of the second heat treatment furnace 20 and the first pyrolysis gas after dust removal through the first heat exchanger 30. The temperature of the tail gas of the heating flue gas before heat exchange is 750-820 ℃, the temperature of the first pyrolysis gas is 190-220 ℃, the temperature of the tail gas of the heating flue gas after heat exchange is about 270-350 ℃, and the temperature of the first pyrolysis gas is 450-550 ℃. Therefore, after the heat exchange, the temperature of the first pyrolysis gas is sufficient to support the sludge to be partially carbonized in the first heat treatment furnace 10, and the first heat supply source 11 arranged in the first heat treatment furnace 10 is mainly used for removing organic components in the first pyrolysis gas and accurately regulating the temperature, so that the temperature of the heating flue gas at the air inlet end is stably kept at 450-550 ℃.
The heating flue gas tail gas continues to exchange heat with the combustion air through the second heat exchanger 40, and the combustion air after heat exchange enters the first heat supply source 11 and the second heat supply source 21 respectively. The temperature of the heated flue gas tail gas after twice heat exchange is 150-200 ℃. The tail gas of the heating flue gas enters the tail gas treatment device 22 for treatment and then is discharged. The tail gas treatment device 22 comprises a deacidification tower provided with an alkali liquid pool. Because the tail gas of the heating flue gas contains more water vapor, the water in the tail gas can be condensed and recycled.
Because the organic matter component in the drying gas circulates in the system and is burnt by the first heat supply source 11 or the second heat supply source 21, the organic matter cannot escape into the environment in a gaseous or liquid state, and the peculiar smell of the project site is greatly reduced.
The system is used for a certain engineering site, the daily treatment capacity of municipal sludge is 60t/d, and the specific parameters of materials are as follows: the water content is 75-85%, the dry organic matter content is 50-80%, and the dry heat value is 2200Kcal/kg.
The residence time of municipal sludge in the first heat treatment furnace 10 is 45min, which is 20-25min shorter than that of a conventional drying furnace; the residence time of municipal sludge in the second heat treatment furnace 20 is 25min, which is 10-15min shorter than that of a conventional carbonization furnace, and the total heat treatment time is about 30-40min shorter. The pyrolysis end product accords with the national standard, and the heat reduction rate is less than 8 percent.
Claims (13)
1. The municipal sludge is treated by a first heat treatment section and a second heat treatment section, the second heat treatment section is heated by a jacket, and a second heat supply source is arranged on the second heat treatment section to provide a heat source for the jacket, and the method is characterized in that:
(1) Controlling the water content of municipal sludge in the first heat treatment section to ensure that the water content of a feeding end is more than 60 percent and the water content of a discharging end is less than 30 percent;
(2) The air inlet end of the first heat treatment section is positioned at the discharge end of the first heat treatment section, the first heat treatment section is provided with a first heat supply source, heating smoke guided out by the first heat supply source enters the first heat treatment section from the air inlet end of the first heat treatment section and is in direct contact with municipal sludge, the movement direction of the heating smoke is opposite to the advancing direction of the municipal sludge, and the temperature of the heating smoke at the air inlet end is not less than 450 ℃ so that the municipal sludge is partially carbonized at the rear section of the first heat treatment section;
(3) Municipal sludge is led out from the first heat treatment section and enters the second heat treatment section, the municipal sludge is carbonized in the second heat treatment section, the second heat treatment section generates second pyrolysis gas, and the second pyrolysis gas is led into a second heat supply source and/or a first heat supply source for recycling;
(4) The first pyrolysis gas generated by the first heat treatment section is led out through the air outlet end of the first heat treatment section, the part of the first pyrolysis gas after dry dedusting is led to the first heat supply source so that part of the first pyrolysis gas forms circulation among the air outlet end of the first heat treatment section, the first heat supply source and the air inlet end of the first heat treatment section, and the part of the first pyrolysis gas is led to the second heat supply source so that part of the first pyrolysis gas is recycled through the second heat supply source and is discharged after being treated by tail gas along with the heating flue gas of the second heat treatment section.
2. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 1, wherein the method comprises the following steps: the first pyrolysis gas is directed to a first heat supply source in an amount of at least 50% of the amount of the first pyrolysis gas.
3. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 1, wherein the method comprises the following steps: the temperature of the first pyrolysis gas when being led out from the gas outlet end of the first heat treatment section is not more than 300 ℃.
4. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 1, wherein the method comprises the following steps: and the temperature of heating flue gas generated by the second heat supply source at the air inlet end of the jacket is not less than 850 ℃.
5. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 1, wherein the method comprises the following steps: and (3) dedusting in the step (4) by adopting a bag-type dust remover.
6. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 5, wherein: the dust outlet of the bag-type dust collector is communicated with the feeding end of the second heat treatment section.
7. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 1, wherein the method comprises the following steps: and (3) carrying out heat exchange on the first pyrolysis gas subjected to dust removal treatment in the step (4) and the heating flue gas tail gas led out from the jacket so as to raise the temperature of the first pyrolysis gas.
8. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 1, wherein the method comprises the following steps: the first heat supply source and the second heat supply source are provided with combustion-supporting air, and the combustion-supporting air exchanges heat with the heating flue gas tail gas led out from the jacket to reduce the temperature of the heating flue gas tail gas.
9. The method for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 1, wherein the method comprises the following steps: the tail gas treatment in the step (4) comprises deacidification treatment.
10. The utility model provides an integrated equipment of carbomorphism coupling carbomorphism technology processing municipal sludge, includes first heat treatment furnace (10) and second heat treatment furnace (20), and second heat treatment furnace (20) are the indirect thermal desorption stove that adopts the clamp to heat, and second heat treatment furnace (20) are furnished with second heat supply source (21) and are provided the heat source for the clamp, its characterized in that: the first heat treatment furnace (10) is a direct thermal desorption furnace, the air inlet end of the first heat treatment furnace (10) is positioned at the discharge end of the first heat treatment furnace, the first heat treatment furnace (10) is provided with a first heat supply source (11), and the first heat supply source (11) is connected with the air inlet end of the first heat treatment furnace (10); the gas outlet end of the first heat treatment furnace (10) is connected with the dry dust removing device (12), the gas outlet end of the dry dust removing device (12) is communicated with the first heat supply source (11) and the second heat supply source (21), the jacket of the second heat treatment furnace (20) is connected with the tail gas treatment device (22), and the pyrolysis gas outlet of the second heat treatment furnace (20) is communicated with the second heat supply source (21) and/or the first heat supply source (11).
11. The integrated equipment for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 10, wherein: the dust outlet of the dry dust removing device (12) is communicated with the feeding end of the second heat treatment furnace (20).
12. The integrated equipment for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 10, wherein: a first heat exchanger (30) for raising the temperature of the first pyrolysis gas generated by the first heat treatment furnace (10) is arranged between the jacket of the second heat treatment furnace (20) and the tail gas treatment device (22).
13. The integrated equipment for treating municipal sludge by using a semi-carbonization coupling carbonization process according to claim 10, wherein: the tail gas treatment device (22) comprises a deacidification tower provided with an alkali liquid pool.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210838664.XA CN117447039A (en) | 2022-07-18 | 2022-07-18 | Method and integrated equipment for treating municipal sludge by semi-carbonization coupling carbonization process |
| PCT/CN2023/084625 WO2024016719A1 (en) | 2022-07-18 | 2023-03-29 | Method for treating municipal sludge by using semi-carbonization coupled carbonization process, and integrated apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210838664.XA CN117447039A (en) | 2022-07-18 | 2022-07-18 | Method and integrated equipment for treating municipal sludge by semi-carbonization coupling carbonization process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117447039A true CN117447039A (en) | 2024-01-26 |
Family
ID=89586053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210838664.XA Pending CN117447039A (en) | 2022-07-18 | 2022-07-18 | Method and integrated equipment for treating municipal sludge by semi-carbonization coupling carbonization process |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117447039A (en) |
| WO (1) | WO2024016719A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130020518A (en) * | 2011-08-19 | 2013-02-27 | 박준호 | Sludge carbonizing system, and byproduct fuel extraction method |
| CN108862973B (en) * | 2018-06-22 | 2020-11-24 | 山东大学 | Device and method for preparing charcoal by pyrolyzing sludge based on microwave-induced directional heating technology |
| CN210764947U (en) * | 2019-08-28 | 2020-06-16 | 广东天源环境科技有限公司 | Sludge drying, carbonizing and gasifying system |
| CN211595397U (en) * | 2019-11-19 | 2020-09-29 | 江苏中顺节能科技有限公司 | Biomass gas-carbon co-production coupling sludge deep treatment system |
| CN110746070A (en) * | 2019-11-19 | 2020-02-04 | 江苏中顺节能科技有限公司 | Biomass gas-carbon co-production coupling sludge deep treatment system and method |
| CN114477709A (en) * | 2022-02-25 | 2022-05-13 | 江苏碧诺环保科技有限公司 | Heavy metal sludge carbonization system not prone to blockage |
-
2022
- 2022-07-18 CN CN202210838664.XA patent/CN117447039A/en active Pending
-
2023
- 2023-03-29 WO PCT/CN2023/084625 patent/WO2024016719A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024016719A1 (en) | 2024-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111288463A (en) | Sludge drying and incinerating system and drying and incinerating method | |
| CN104986934A (en) | Continuous thermal decomposition method and apparatus for sludge | |
| CN215886751U (en) | Sludge two-stage drying pyrolysis disposal system | |
| CN101708939B (en) | Sludge drying incineration processing system utilizing system residual heat | |
| CN201272730Y (en) | Sludge drying and incinerating system | |
| CN214400194U (en) | Municipal sludge drying pyrolysis carbonization system | |
| CN112939397A (en) | Method and system for sludge carbonization-coupled fusion treatment | |
| CN111253965A (en) | System and method for treating organic solid waste in villages and towns | |
| CN117447039A (en) | Method and integrated equipment for treating municipal sludge by semi-carbonization coupling carbonization process | |
| CN115899716A (en) | Thermal power plant flue gas-sludge-solar energy comprehensive gradient utilization system and method | |
| CN111116006B (en) | Circulating regenerative sludge treatment system and method | |
| CN108613507B (en) | Sludge treatment device with combined drying and incineration coupling | |
| CN111620542A (en) | Sludge drying treatment equipment | |
| CN217997008U (en) | Sludge drying and carbonizing combined heat treatment equipment | |
| CN219701497U (en) | Heat treatment equipment suitable for sludge pyrolysis smoke whitening | |
| CN108658417A (en) | A kind of coal unit collaboration desiccation municipal sludge system | |
| CN211645034U (en) | System for handle mud | |
| CN212713214U (en) | Sludge drying treatment equipment | |
| CN217516832U (en) | System for drying sludge by utilizing deep recovery waste heat of flue gas | |
| CN220550097U (en) | Municipal sludge drying and cement production line coupling system | |
| CN213596130U (en) | Drying-pyrolysis gasification sludge treatment system | |
| CN218936356U (en) | Household garbage incineration-coupled sludge drying incineration disposal system | |
| CN215403741U (en) | System for sludge carbonization coupling melting treatment | |
| CN111678152B (en) | Indirect sludge drying and incinerating system and drying and incinerating method thereof | |
| CN216591736U (en) | Sludge independent incineration and coal-fired power plant deep peak regulation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |