CN117142735A - Sludge drying pyrolysis process gas treatment system and treatment method - Google Patents
Sludge drying pyrolysis process gas treatment system and treatment method Download PDFInfo
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- CN117142735A CN117142735A CN202311245955.9A CN202311245955A CN117142735A CN 117142735 A CN117142735 A CN 117142735A CN 202311245955 A CN202311245955 A CN 202311245955A CN 117142735 A CN117142735 A CN 117142735A
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 323
- 238000001035 drying Methods 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 88
- 239000010802 sludge Substances 0.000 title claims abstract description 76
- 239000003921 oil Substances 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000295 fuel oil Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 193
- 238000001816 cooling Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000002688 persistence Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 241000700605 Viruses Species 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
-
- 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
-
- 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
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
-
- 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
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
-
- 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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge drying pyrolysis process gas treatment system and a treatment method. The drying treatment subsystem comprises a drying tank, a drying gas filter, a drying gas condenser, a pyrolysis water storage tank and a drying gas fan which are connected in sequence. The medium-temperature pyrolysis treatment subsystem comprises a medium-temperature pyrolysis tank, a pyrolysis oil vapor filter, a pyrolysis oil vapor condenser, a pyrolysis heavy oil storage tank and a pyrolysis oil vapor fan which are sequentially connected, wherein a sludge inlet of the medium-temperature pyrolysis tank is connected with a sludge outlet of the drying tank. The pyrolysis treatment subsystem comprises a pyrolysis tank, a pyrolysis gas filter, a pyrolysis gas condenser, a pyrolysis light oil storage tank and a pyrolysis gas fan, wherein a sludge inlet of the pyrolysis tank is connected with a sludge outlet of the middle-temperature pyrolysis tank. The pyrolysis gas treatment subsystem is respectively connected with the drying gas fan, the pyrolysis oil vapor fan and the pyrolysis gas fan. The gas product of the invention has single and stable characteristics, is easy to process, and can improve the processing efficiency, the heat utilization rate and the system stability.
Description
Technical Field
The invention relates to a sludge treatment system, in particular to a sludge drying pyrolysis process gas treatment system and a treatment method.
Background
The organic solid waste treated by pyrolysis at present mainly comprises municipal sludge, industrial oil sludge and the like. The sludge has the characteristics of high yield, high water content, high pollution and the like. The sludge contains a large amount of harmful substances such as pathogenic bacteria, parasitic ova, viruses, heavy metals and the like, leachate is extremely easy to produce to pollute underground water in the processes of storage, transportation and treatment, and harmful gases can also pollute the surrounding environment. The treatment modes of single anaerobic treatment, drying incineration, composting and the like are the most adopted at present, but the treatment modes have the problems of incomplete treatment, secondary pollution transfer and the like. The sludge drying pyrolysis process can better solve the problems.
The gas generated in the existing sludge pyrolysis process is coarsely disposed, such as pyrolysis gas generated in most pyrolysis furnaces, is directly sent into a combustor for combustion, and because the gas content is unstable, pipelines and equipment are easy to be blocked during direct combustion. The water content in the sludge is high, the heat value of the gaseous product is low, if the sludge is directly sent to a combustor for combustion, unstable and unreliable combustion can be caused, for example, when the water content of the sludge raw material is 30-40%, the water vapor ratio of the gaseous product generated by pyrolysis can be up to 60-80%.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, on the one hand, the invention provides a sludge drying pyrolysis process gas treatment system which can extract pyrolysis process gas for targeted treatment and improve the heat utilization rate and stability.
On the other hand, the invention also provides a gas treatment method in the sludge drying pyrolysis process.
According to an embodiment of the first aspect of the invention, the sludge drying pyrolysis process gas treatment system comprises a drying treatment subsystem, a medium-temperature pyrolysis treatment subsystem, a pyrolysis treatment subsystem and a pyrolysis gas treatment subsystem. The drying treatment subsystem comprises a drying tank, a drying gas filter, a drying gas condenser, a pyrolysis water storage tank and a drying gas fan which are sequentially connected, wherein the drying tank is provided with a sludge inlet. The medium-temperature pyrolysis treatment subsystem comprises a medium-temperature pyrolysis tank, a pyrolysis oil vapor filter, a pyrolysis oil vapor condenser, a pyrolysis heavy oil storage tank and a pyrolysis oil vapor fan which are sequentially connected, wherein a sludge inlet of the medium-temperature pyrolysis tank is connected with a sludge outlet of the drying tank. The high-temperature pyrolysis treatment subsystem comprises a high-temperature pyrolysis tank, a pyrolysis gas filter, a pyrolysis gas condenser, a pyrolysis light oil storage tank and a pyrolysis gas fan, wherein a sludge inlet of the high-temperature pyrolysis tank is connected with a sludge outlet of the medium-temperature pyrolysis tank. The pyrolysis gas treatment subsystem is respectively connected with the drying gas fan, the pyrolysis oil vapor fan and the pyrolysis gas fan and is used for treating generated drying gas, pyrolysis oil vapor and pyrolysis gas and conveying heat energy generated in the treatment process to the drying tank, the medium-temperature pyrolysis tank and the high-temperature pyrolysis tank.
According to the embodiment of the first aspect of the invention, the sludge drying pyrolysis process gas treatment system has at least the following beneficial effects:
the invention of the embodiment is applied to a three-stage extraction pyrolysis process gas process of a drying tank, a medium-temperature pyrolysis tank and a pyrolysis tank, and the pyrolysis process gas is respectively extracted and processed in a targeted manner according to the characteristics of pyrolysis process gas generated in different process stages. Specifically, the drying gas generated by the drying tank is filtered and condensed to remove water vapor, and then the water vapor is sent to the pyrolysis gas treatment subsystem for treatment, and the pyrolysis oil vapor generated by the medium-temperature pyrolysis tank is filtered and condensed to remove heavy condensate oil and then sent to the pyrolysis gas treatment subsystem for treatment; and filtering and condensing pyrolysis gas generated by the pyrolysis tank to remove light condensed oil, and sending the light condensed oil into the pyrolysis gas treatment subsystem for treatment. Because of the pyrolysis process gas extracted in a grading way, the gas product has single and stable characteristics and is easy to process. The scale of the post-treatment device for the pyrolysis process gas extracted in a grading way is far smaller than that of the post-treatment device in the process of non-grading extraction, and the post-treatment device is more convenient to operate and maintain in the process of grading extraction. In addition, pyrolysis vapor is generated and led out from a drying tank with relatively low process temperature, and the heat taken away by the vapor is less than that of the pyrolysis vapor under the process of a single pyrolysis device, so that the heat carried by pyrolysis gas is increased, and the heat utilization rate is improved. The invention can improve the treatment efficiency, the heat utilization rate and the stability, the reliability and the persistence of the system.
According to some embodiments of the invention, the pyrolysis gas processing subsystem is provided with a pyrolysis gas burner and an auxiliary burner, wherein the pyrolysis gas burner is connected with the drying gas fan, the pyrolysis oil vapor fan and the pyrolysis gas fan, and a hot flue gas outlet of the pyrolysis gas burner and a hot flue gas outlet of the auxiliary burner are connected in parallel and then connected with the drying tank, the medium-temperature pyrolysis tank and the high-temperature pyrolysis tank; the auxiliary burner is provided with a natural gas inlet.
According to some embodiments of the invention, the drying tank, the medium temperature pyrolysis tank and the high temperature pyrolysis tank are provided with a first sandwich structure, and the pyrolysis gas processing subsystem is connected with the first sandwich structure of the drying tank, the medium temperature pyrolysis tank and the high temperature pyrolysis tank.
According to some embodiments of the invention, a gas holder is arranged between the pyrolysis light oil storage tank and the pyrolysis gas blower, and the gas holder is used for controlling the discharge capacity of pyrolysis gas.
According to some embodiments of the invention, the temperature of the drying tank is less than 200 ℃.
According to some embodiments of the invention, the medium temperature pyrolysis tank temperature is 200 ℃ to 400 ℃.
According to some embodiments of the invention, the temperature of the pyrolysis tank is 400 ℃ to 600 ℃.
According to some embodiments of the invention, the sludge drying pyrolysis process gas treatment system further comprises a cooling tank, a sludge inlet of the cooling tank being connected to a sludge outlet of the high temperature pyrolysis tank.
According to some embodiments of the invention, the tank body of the cooling tank is provided with a second sandwich structure for introducing a cooling medium.
According to a second aspect of the present invention, a method for treating a sludge drying pyrolysis process gas, which is applied to the sludge drying pyrolysis process gas treatment system described in the above embodiment, includes the following steps:
drying sludge in the drying tank, leading out dry gas by the dry gas fan, filtering and condensing the dry gas by the dry gas filter and the dry gas condenser, removing water vapor, and delivering the residual small amount of non-condensable dry gas into the pyrolysis gas treatment subsystem for treatment;
sending the dried sludge into the medium-temperature pyrolysis tank, leading out heavy pyrolysis oil vapor by the pyrolysis oil vapor fan, filtering and condensing the heavy pyrolysis oil vapor by the pyrolysis oil vapor filter and the pyrolysis oil vapor condenser, removing heavy condensed oil, and sending the residual small amount of pyrolysis oil vapor into the pyrolysis gas treatment subsystem for treatment;
sending the sludge after medium-temperature pyrolysis into the high-temperature pyrolysis tank, leading out light pyrolysis oil vapor and pyrolysis gas by the pyrolysis gas fan, filtering and condensing the light pyrolysis oil by the pyrolysis gas filter and the pyrolysis gas condenser, and sending the rest pyrolysis gas into the pyrolysis gas treatment subsystem for treatment;
and feeding heat energy generated by the pyrolysis gas treatment subsystem back to the drying tank, the medium-temperature pyrolysis tank and the high-temperature pyrolysis tank.
According to the embodiment of the second aspect of the invention, the sludge drying pyrolysis process gas treatment method has at least the following beneficial effects:
the characteristics of the gas products of the pyrolysis process gas extracted in a grading way are single and stable, and the gas products are easy to process. The scale of the post-treatment device for the pyrolysis process gas extracted in a grading way is far smaller than that of the post-treatment device in the process of non-grading extraction, and the post-treatment device is more convenient to operate and maintain in the process of grading extraction. In addition, pyrolysis vapor is generated and led out from a drying tank with relatively low process temperature, and the heat taken away by the vapor is less than that of the pyrolysis vapor under the process of a single pyrolysis device, so that the heat carried by pyrolysis gas is increased, and the heat utilization rate is improved. The invention can improve the treatment efficiency, the heat utilization rate and the stability, the reliability and the persistence of the system.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an embodiment of a sludge drying pyrolysis process gas treatment system in accordance with the present invention;
FIG. 2 is a schematic diagram of another embodiment of a sludge drying pyrolysis process gas treatment system in accordance with the present invention;
reference numerals:
110. a drying tank; 111. a dry gas filter; 112. a dry gas condenser; 113. a pyrolysis water storage tank; 114. a drying air blower;
120. a medium-temperature pyrolysis tank; 121. a pyrolysis oil vapor filter; 122. a pyrolysis oil vapor condenser; 123. a pyrolysis heavy oil storage tank; 124. a pyrolysis oil vapor blower;
130. a high-temperature pyrolysis tank; 131. a pyrolysis gas filter; 132. a pyrolysis gas condenser; 133. a pyrolysis light oil storage tank; 134. a pyrolysis gas fan; 135. A gas storage tank;
140. a pyrolysis burner; 141. An auxiliary burner;
150. and (5) cooling the tank.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Referring to fig. 1, a sludge drying pyrolysis process gas treatment system according to an embodiment of the present invention includes a drying treatment subsystem, a medium temperature pyrolysis treatment subsystem, a pyrolysis treatment subsystem, and a pyrolysis gas treatment subsystem. The drying subsystem comprises a drying tank 110, a drying gas filter 111, a drying gas condenser 112, a pyrolysis water storage tank 113 and a drying gas fan 114 which are connected in sequence, and the drying tank 110 is provided with a sludge inlet. The medium-temperature pyrolysis treatment subsystem comprises a medium-temperature pyrolysis tank 120, a pyrolysis oil vapor filter 121, a pyrolysis oil vapor condenser 122, a pyrolysis heavy oil storage tank 123 and a pyrolysis oil vapor fan 124 which are sequentially connected, wherein a sludge inlet of the medium-temperature pyrolysis tank 120 is connected with a sludge outlet of the drying tank 110. The pyrolysis treatment subsystem comprises a pyrolysis tank 130, a pyrolysis gas filter 131, a pyrolysis gas condenser 132, a pyrolysis light oil storage tank 133 and a pyrolysis gas fan 134, wherein a sludge inlet of the pyrolysis tank 130 is connected with a sludge outlet of the middle-temperature pyrolysis tank 120. The pyrolysis gas processing subsystem is respectively connected with the drying gas blower 114, the pyrolysis oil vapor blower 124 and the pyrolysis gas blower 134, and is used for processing the generated drying gas, pyrolysis oil vapor and pyrolysis gas and delivering heat energy generated in the processing process to the drying tank 110, the medium-temperature pyrolysis tank 120 and the high-temperature pyrolysis tank 130.
The invention of the embodiment is applied to the three-stage extraction pyrolysis process gas process of the drying tank 110, the medium-temperature pyrolysis tank 120 and the high-temperature pyrolysis tank 130, and the pyrolysis process gas is respectively extracted and processed in a targeted manner according to the characteristics of the pyrolysis process gas generated in different process stages. Specifically, the drying gas generated by the drying tank 110 is filtered and condensed to remove water vapor, and then sent to the pyrolysis gas treatment subsystem for treatment, and the pyrolysis oil vapor generated by the medium-temperature pyrolysis tank 120 is filtered and condensed to remove heavy condensate oil and then sent to the pyrolysis gas treatment subsystem for treatment; pyrolysis gas generated by the pyrolysis tank 130 is filtered and condensed to remove light condensate oil, and the light condensate oil is sent to a pyrolysis gas treatment subsystem for treatment. Because of the pyrolysis process gas extracted in a grading way, the gas product has single and stable characteristics and is easy to process. The scale of the post-treatment device for the pyrolysis process gas extracted in a grading way is far smaller than that of the post-treatment device in the process of non-grading extraction, and the post-treatment device is more convenient to operate and maintain in the process of grading extraction. In addition, pyrolysis steam is generated and led out from the drying tank 110 with relatively low process temperature, and the heat carried by the steam is less than that of the single pyrolysis device process, so that the heat carried by the pyrolysis gas is increased, and the heat utilization rate is improved. The invention can improve the treatment efficiency, the heat utilization rate and the stability, the reliability and the persistence of the system.
Referring to fig. 1, it can be understood that the pyrolysis gas processing subsystem is provided with a pyrolysis gas burner and an auxiliary burner 141, the pyrolysis gas burner is connected to the drying gas blower 114, the pyrolysis oil vapor blower 124 and the pyrolysis gas blower 134, and the hot flue gas outlets of the pyrolysis gas burner and the auxiliary burner 141 are connected in parallel and then connected to the drying tank 110, the medium-temperature pyrolysis tank 120 and the high-temperature pyrolysis tank 130; the auxiliary burner 141 is provided with a natural gas inlet. In the initial start-up stage of the system of the embodiment, no pyrolysis gas is used as a heat source, so that the auxiliary burner 141 is externally connected with natural gas to provide a heat source; in addition, during system operation, when the pyrolysis gas is insufficient or fluctuates, the auxiliary burner 141 may be turned on to stably operate.
It is understood that the bodies of the drying tank 110, the medium temperature pyrolysis tank 120, and the high temperature pyrolysis tank 130 are provided with a first sandwich structure, and the pyrolysis gas processing subsystem is connected with the first sandwich structure of the drying tank 110, the medium temperature pyrolysis tank 120, and the high temperature pyrolysis tank 130.
Referring to fig. 1, it will be understood that during pyrolysis, the generation of pyrolysis gas is unstable, and generally the initial period, the middle period and the final period are reduced, so that in order to maintain a stable load in the whole operation period, a gas storage tank 135 is disposed between the pyrolysis light oil storage tank 133 and the pyrolysis gas blower 134, and the gas storage tank 135 is used for controlling the discharge amount of pyrolysis gas, and the amount and the load can be well controlled by periodic gas discharge and combustion.
It is understood that the temperature of the drying pot 110 is less than 200 ℃.
It is understood that the temperature of the medium temperature pyrolysis tank 120 is 200 deg.c to 400 deg.c.
It is understood that the temperature of the pyrolysis tank 130 is 400 deg.c to 600 deg.c.
It will be appreciated that the sludge drying pyrolysis process gas treatment system further comprises a cooling tank 150, the sludge inlet of the cooling tank 150 being connected to the sludge outlet of the pyrolysis tank 130.
It will be appreciated that the tank body of the cooling tank 150 is provided with a second sandwich structure for the passage of a cooling medium, which may be in particular cold air or cooling water.
Referring to fig. 2, it can be understood that when the water content of the organic solid waste such as sludge is low, the drying gas process can be omitted, the system is composed of a medium-temperature pyrolysis tank 120, a high-temperature pyrolysis tank 130 and a cooling tank 150, pyrolysis is performed to generate heavy pyrolysis oil vapor and pyrolysis gas, and the pyrolysis process gas with two different characteristics is respectively and independently led out for treatment.
According to a second aspect of the present invention, a method for treating a sludge drying pyrolysis process gas, using the sludge drying pyrolysis process gas treatment system of the above embodiment, includes the following steps:
drying sludge in a drying tank 110, leading out dry gas by a dry gas fan 114, filtering and condensing the dry gas by a dry gas filter 111 and a dry gas condenser 112, removing water vapor, and delivering the rest small amount of non-condensable dry gas into a pyrolysis gas treatment subsystem for treatment;
the dried sludge is sent to a medium-temperature pyrolysis tank 120, heavy pyrolysis oil vapor is led out by a pyrolysis oil vapor fan 124, filtered and condensed by a pyrolysis oil vapor filter 121 and a pyrolysis oil vapor condenser 122, heavy condensed oil is removed, and a small amount of remaining pyrolysis oil vapor is sent to a pyrolysis gas treatment subsystem for treatment;
the sludge after medium-temperature pyrolysis is sent to a pyrolysis tank 130, a pyrolysis gas fan 134 leads out light pyrolysis oil vapor and pyrolysis gas, the light pyrolysis oil vapor and the pyrolysis gas are filtered and condensed by a pyrolysis gas filter 131 and a pyrolysis gas condenser 132, the light condensed oil is removed, and the residual pyrolysis gas is sent to a pyrolysis gas treatment subsystem for treatment;
the thermal energy generated by the pyrolysis gas processing subsystem is fed back into the drying tank 110, the medium temperature pyrolysis tank 120, and the high temperature pyrolysis tank 130.
The pyrolysis process gas which is extracted in a grading way by the sludge drying pyrolysis process gas treatment method has the characteristics of single and stable gas products and is easy to treat. The scale of the post-treatment device for the pyrolysis process gas extracted in a grading way is far smaller than that of the post-treatment device in the process of non-grading extraction, and the post-treatment device is more convenient to operate and maintain in the process of grading extraction. In addition, pyrolysis steam is generated and led out from the drying tank 110 with relatively low process temperature, and the heat carried by the steam is less than that of the single pyrolysis device process, so that the heat carried by the pyrolysis gas is increased, and the heat utilization rate is improved. The invention can improve the treatment efficiency, the heat utilization rate and the stability, the reliability and the persistence of the system.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A sludge drying pyrolysis process gas treatment system, comprising:
the drying treatment subsystem comprises a drying tank, a drying gas filter, a drying gas condenser, a pyrolysis water storage tank and a drying gas fan which are connected in sequence, wherein the drying tank is provided with a sludge inlet;
the medium-temperature pyrolysis treatment subsystem comprises a medium-temperature pyrolysis tank, a pyrolysis oil vapor filter, a pyrolysis oil vapor condenser, a pyrolysis heavy oil storage tank and a pyrolysis oil vapor fan which are connected in sequence, wherein a sludge inlet of the medium-temperature pyrolysis tank is connected with a sludge outlet of the drying tank;
the pyrolysis treatment subsystem comprises a pyrolysis tank, a pyrolysis gas filter, a pyrolysis gas condenser, a pyrolysis light oil storage tank and a pyrolysis gas fan, wherein a sludge inlet of the pyrolysis tank is connected with a sludge outlet of the middle-temperature pyrolysis tank; and
and the pyrolysis gas treatment subsystem is respectively connected with the drying gas fan, the pyrolysis oil vapor fan and the pyrolysis gas fan and is used for treating generated drying gas, pyrolysis oil vapor and pyrolysis gas and conveying heat energy generated in the treatment process to the drying tank, the medium-temperature pyrolysis tank and the high-temperature pyrolysis tank.
2. The sludge drying pyrolysis process gas treatment system of claim 1, wherein: the pyrolysis gas treatment subsystem is provided with a pyrolysis gas burner and an auxiliary burner, the pyrolysis gas burner is connected with the drying gas fan, the pyrolysis oil vapor fan and the pyrolysis gas fan, and the pyrolysis gas burner and a hot flue gas outlet of the auxiliary burner are connected in parallel and then connected with the drying tank, the medium-temperature pyrolysis tank and the high-temperature pyrolysis tank; the auxiliary burner is provided with a natural gas inlet.
3. The sludge drying pyrolysis process gas treatment system of claim 2, wherein: the drying tank, the medium temperature pyrolysis tank and the tank body of the high temperature pyrolysis tank are all provided with a first sandwich structure, and the pyrolysis gas treatment subsystem is connected with the drying tank, the medium temperature pyrolysis tank and the first sandwich structure of the high temperature pyrolysis tank.
4. The sludge drying pyrolysis process gas treatment system of claim 1, wherein: and a gas storage cabinet is arranged between the pyrolysis light oil storage tank and the pyrolysis gas fan and used for controlling the discharge capacity of pyrolysis gas.
5. The sludge drying pyrolysis process gas treatment system of claim 1, wherein: the temperature of the drying tank is less than 200 ℃.
6. The sludge drying pyrolysis process gas treatment system of claim 1, wherein: the temperature of the medium-temperature pyrolysis tank is 200-400 ℃.
7. The sludge drying pyrolysis process gas treatment system of claim 1, wherein: the temperature of the high-temperature pyrolysis tank is 400-600 ℃.
8. The sludge drying pyrolysis process gas treatment system of claim 1, wherein: the sludge drying pyrolysis process gas treatment system further comprises a cooling tank, and a sludge inlet of the cooling tank is connected with a sludge outlet of the high-temperature pyrolysis tank.
9. The sludge drying pyrolysis process gas treatment system of claim 8 wherein: the tank body of the cooling tank is provided with a second sandwich structure, and the second sandwich structure is used for introducing cooling medium.
10. A sludge drying pyrolysis process gas treatment method is characterized in that: use of a sludge drying pyrolysis process gas treatment system according to any one of claims 1 to 9, comprising the steps of:
drying sludge in the drying tank, leading out dry gas by the dry gas fan, filtering and condensing the dry gas by the dry gas filter and the dry gas condenser, removing water vapor, and delivering the residual small amount of non-condensable dry gas into the pyrolysis gas treatment subsystem for treatment;
sending the dried sludge into the medium-temperature pyrolysis tank, leading out heavy pyrolysis oil vapor by the pyrolysis oil vapor fan, filtering and condensing the heavy pyrolysis oil vapor by the pyrolysis oil vapor filter and the pyrolysis oil vapor condenser, removing heavy condensed oil, and sending the residual small amount of pyrolysis oil vapor into the pyrolysis gas treatment subsystem for treatment;
sending the sludge after medium-temperature pyrolysis into the high-temperature pyrolysis tank, leading out light pyrolysis oil vapor and pyrolysis gas by the pyrolysis gas fan, filtering and condensing the light pyrolysis oil by the pyrolysis gas filter and the pyrolysis gas condenser, and sending the rest pyrolysis gas into the pyrolysis gas treatment subsystem for treatment;
and feeding heat energy generated by the pyrolysis gas treatment subsystem back to the drying tank, the medium-temperature pyrolysis tank and the high-temperature pyrolysis tank.
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