CN113198394A - Waste heat utilization device and waste heat utilization system for intermittent regeneration waste gas - Google Patents
Waste heat utilization device and waste heat utilization system for intermittent regeneration waste gas Download PDFInfo
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- CN113198394A CN113198394A CN202110424908.5A CN202110424908A CN113198394A CN 113198394 A CN113198394 A CN 113198394A CN 202110424908 A CN202110424908 A CN 202110424908A CN 113198394 A CN113198394 A CN 113198394A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 92
- 239000002918 waste heat Substances 0.000 title claims abstract description 81
- 238000011069 regeneration method Methods 0.000 title claims abstract description 77
- 230000008929 regeneration Effects 0.000 title claims abstract description 75
- 239000007789 gas Substances 0.000 claims abstract description 82
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 claims abstract description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 12
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 5
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000000428 dust Substances 0.000 claims description 33
- 239000012535 impurity Substances 0.000 claims description 29
- 239000007787 solid Substances 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 14
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 8
- 238000011084 recovery Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
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- Chemical Kinetics & Catalysis (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to the technical field of waste heat utilization, and discloses a waste heat utilization device and a waste heat utilization system for intermittently regenerating waste gas, wherein the waste heat utilization device comprises a regenerated gas heating furnace (001), an MTP (methanol to propylene) reactor (002), a steam drum (004), a thermoelectric conversion device and a waste gas discharge pipeline; the regeneration gas heating furnace (001) is connected with the MTP reactor (002), and the MTP reactor (002) is connected with the thermoelectric conversion device through the steam drum (004); the gas cooled by the steam drum (004) is discharged through a waste gas discharge pipeline after exchanging heat with the thermoelectric conversion device; and a pipeline which is used for directly conveying the regenerated gas to the steam drum (004) and is connected with the MTP reactor (002) in parallel is arranged between the regenerated gas heating furnace (001) and the steam drum (004). The invention solves the technical problem of high difficulty in waste heat recycling caused by the intermittent process of catalyst regeneration of the reactor.
Description
Technical Field
The invention relates to the technical field of waste heat utilization, in particular to a waste heat utilization device and a waste heat utilization system for intermittently regenerating waste gas.
Background
The regeneration of the catalyst in the reactor is an intermittent process, so that the difficulty of waste heat recovery is high; the improvement measure of the regeneration process of the catalyst of the common fixed bed reactor is to exchange heat between the high-temperature regenerated waste gas and the fresh regenerated waste gas so as to improve the temperature of the fresh regenerated gas and reduce the load of a regenerated gas heating furnace. But the temperature of the discharged regeneration waste gas is still higher than 350 ℃, and due to the layout of the device, a large temperature loss exists in the conveying process, so that the heat energy is wasted; secondly, high-temperature regenerated waste gas is discharged into the hearth of equipment such as a heating furnace or a cracking furnace and the like for burning so as to provide energy, and then energy recovery is carried out through a heat exchange pipe in the equipment, but the main components of the regenerated waste gas are nitrogen and carbon dioxide, so that the heat efficiency of the heating furnace is reduced. The catalyst powder and impurities carried in the regenerated waste gas are deposited on the surface of the heat exchange tube, so that the heat transfer efficiency is influenced, a flow channel of the regenerated waste gas is blocked in serious cases, the flow resistance is increased, and the stable operation of a catalyst regeneration procedure is influenced. In addition, solid impurities carried in the regeneration exhaust gas can cause impact wear to the heat exchange tubes.
Disclosure of Invention
The invention aims to solve the problem that the regenerated waste gas is generated intermittently and is not easy to recycle, and the low-load heat source supplementing system is arranged to maintain the low-load operation of the unit at the transient loss stage of the regenerated waste gas and ensure the stable operation of the waste heat utilization device, and simultaneously, the technical problems that in the prior art, solid impurities carried by the regenerated waste gas are deposited on the surface of a heat exchange tube to influence the heat transfer efficiency or block a flow channel and impact abrasion is caused to the heat exchange tube for a long time are solved.
The invention provides a waste heat utilization device and a waste heat utilization system for intermittent regeneration waste gas, which have a conventional treatment method for directly discharging the intermittent high-temperature regeneration waste gas into a torch or atmosphere by changing the conventional treatment method, integrate a waste heat steam production technology and an ORC power generation technology into a waste heat utilization system, realize reasonable utilization of intermittent waste heat energy through gradient utilization of heat energy, and contribute to improving the energy utilization rate of the device.
Meanwhile, in order to solve the problem that the regenerated waste gas is not easy to recycle due to intermittent generation, the waste heat utilization device and the waste heat utilization system for the intermittent regenerated waste gas are provided with the low-load heat source supplementing system so as to maintain the low-load operation of the unit at the transient loss stage of the regenerated waste gas and ensure the stable operation of the waste heat utilization device.
In order to achieve the above object, an aspect of the present invention provides a waste heat utilization apparatus that intermittently regenerates exhaust gas.
The waste heat utilization device of the intermittent regeneration waste gas comprises a regeneration gas heating furnace, an MTP reactor, a steam pocket, a thermoelectric conversion device and a waste gas discharge pipeline;
the regeneration gas heating furnace is connected with the MTP reactor, and the MTP reactor is connected with the thermoelectric conversion device through the steam drum; the regenerated waste gas cooled by the steam drum is discharged through a waste gas discharge pipeline after exchanging heat with the thermoelectric conversion device; wherein the content of the first and second substances,
and a pipeline which is used for directly conveying the regenerated gas to the steam drum and is connected with the MTP reactor in parallel is arranged between the regenerated gas heating furnace and the steam drum.
The invention reduces the temperature of the regenerated waste gas output from the MTP reactor by arranging the steam pocket, thereby meeting the condition of thermoelectric conversion, converting the temperature of the regenerated waste gas into electric energy by the thermoelectric conversion device, and releasing the utilized regenerated waste gas into the atmosphere through a waste gas discharge pipeline or entering a torch discharge system for treatment. Because the MTP reactor is intermittent in the output of the regenerated waste gas, in order to ensure the continuous operation of the thermoelectric conversion device, a pipeline which is used for directly conveying the regenerated waste gas to the steam drum and is connected with the MTP reactor in parallel is arranged between the regenerated gas heating furnace and the steam drum, so that the regenerated waste gas is ensured to flow through the thermoelectric conversion device in real time, the phenomenon that the thermoelectric conversion device cannot normally operate in the switching process of the MTP reactor is avoided, and the technical problem that the difficulty of waste heat recovery and utilization is high because the regeneration of a reactor catalyst is an intermittent process is solved.
Preferably, the thermoelectric conversion device comprises an evaporator, an expander, a condenser and a working medium pump, the evaporator absorbs the heat energy of the regenerated exhaust gas output by the steam pocket through an organic working medium and applies work in the expander to convert the heat energy into electric energy, the condenser is arranged at the downstream of the expander and is used for cooling the organic working medium output by the expander and applied with work, and the working medium pump pressurizes the organic working medium cooled by the condenser and conveys the organic working medium back to the evaporator to cool the gas output by the steam pocket.
Preferably, the thermoelectric conversion device further includes a preheater disposed downstream of the working fluid pump and in contact with the exhaust gas discharge line to preheat the utility.
Preferably, the waste heat utilization device comprises a dust remover which is arranged on a pipeline between the MTP reactor and the steam drum and is used for removing dust from the regenerated waste gas conveyed into the steam drum by the MTP reactor.
Preferably, a pipeline communicated to the steam drum is arranged at the top of the dust remover, and a solid impurity discharging pipeline for discharging solid impurities is arranged at the bottom of the dust remover.
Preferably, the waste heat utilization device comprises a boiler feed water pipeline used for conveying boiler feed water from the battery limits to the steam drum for heat exchange.
Preferably, the waste heat utilization device comprises a steam turbine for converting energy of the gas entering the steam drum.
Preferably, the end of the turbine is provided with a mixer for mixing the liquid generated by cooling the gas in the turbine with boiler feed water from the battery limits.
Preferably, the waste heat utilization device comprises a boiler feed water pipeline used for conveying boiler feed water from the battery limits to the steam pocket for heat exchange, and the mixer is communicated with the boiler feed water pipeline.
Preferably, a purification device is provided between the mixer and the boiler feed water line.
A second aspect of the invention provides a waste heat utilization system for intermittently regenerating exhaust gas;
the waste heat utilization system of the intermittent regeneration waste gas comprises any one of the waste heat utilization devices of the intermittent regeneration waste gas, the regeneration gas heating furnace is connected with fresh regeneration gas, and the waste gas discharge pipeline is connected to a regeneration waste gas discharge pipeline or a regeneration waste gas discharge pipeline.
Drawings
FIG. 1 is a schematic diagram of a fixed bed reactor regeneration system of the prior art;
FIG. 2 is a schematic diagram of a waste heat utilization device and a waste heat utilization system for intermittently regenerating exhaust gas according to an embodiment of the present invention;
fig. 3 is a schematic diagram of another waste heat utilization device and system for intermittently regenerating exhaust gas according to an embodiment of the present invention.
Description of the reference numerals
001. A regeneration gas heating furnace; 002. an MTP reactor; 003. a dust remover; 004. a steam drum; 005. an evaporator; 006. an expander; 007. a condenser; 008. a working medium pump; 009. a preheater; 010. a steam turbine; 011. a mixer; 101. fresh regeneration gas; 102. a pipeline for discharging solid impurities; 103. saturated steam; 104. a boiler feed water line; 105. a drum drain line; 106. discharging the regenerated waste gas to a torch pipeline; 107. discharging the regenerated waste gas to an atmosphere pipeline; 201. a reactor regeneration waste gas feeding valve group; 202. regenerating waste gas to a drum feed valve group; 203. the top of the dust remover is connected to the steam drum valve bank; 204. a solid impurity discharge valve bank at the bottom of the dust remover; 205. a steam pocket blowdown valve group.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "top", "bottom", "outer" and "middle" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The potential of waste heat utilization is very large, and the waste heat utilization occupies an important position in energy conservation in the current chemical field. The recovery of waste heat resources not only needs to consider the quality of the waste heat resources, but also depends on the development condition of production and the level of science and technology. Waste heat resources can be divided into three categories according to the temperature: high-temperature waste heat (waste heat resources with the temperature higher than 500 ℃), medium-temperature waste heat (waste heat resources with the temperature of 200-500 ℃) and low-temperature waste heat (waste heat resources with the temperature lower than 200 ℃). In the past, only the recycling of a high-grade heat source is emphasized in the chemical field, and the recycling of medium-temperature and low-temperature waste heat resources is not emphasized enough.
The regeneration of MTP (Methanol To Propylene) reactor catalyst is a key process of Methanol To olefin project. After the MTP catalyst is used for a period of time, the activity, the propylene selectivity and the anti-carbon deposition capability of the MTP catalyst are all reduced, so that the catalyst needs to be regenerated off-line in order to maintain the selectivity and the activity of the catalyst on a target product and improve the anti-carbon deposition capability of the catalyst. The MTP reactor is in a two-open one-standby operation mode, at least two reactors need to be off-line for regeneration on average every month, and a large amount of fresh supplemented nitrogen or mixed gas of nitrogen and air is consumed. A schematic of a fixed bed reactor regeneration system is shown in figure 1.
As shown in fig. 1, fresh regeneration gas enters the reactor, reacts with carbon deposits on the surface of the catalyst, and is discharged out of the reactor in the form of regeneration exhaust gas (main components: nitrogen and carbon dioxide). The high-temperature regeneration waste gas at the initial stage and the middle stage of the regeneration of the catalyst of the reactor carries part of combustible gas and is treated in a way of being discharged to a torch system for combustion, and the combustible gas at the final stage of the regeneration is low in content (less than 1000ppm) and even does not contain combustible gas and is treated in a way of being directly discharged to the atmosphere.
Because the regeneration of the catalyst in the reactor is an intermittent process, the difficulty of waste heat recovery is high.
In order to solve the above problems, the present invention provides a waste heat utilization device and a waste heat utilization system for intermittently regenerating exhaust gas.
As shown in fig. 2, the waste heat utilization device for intermittently regenerating exhaust gas provided by the present invention includes a regeneration gas heating furnace 001, an MTP reactor 002, a steam drum 004, a thermoelectric conversion device, and an exhaust gas discharge pipeline. The regeneration gas heating furnace 001 is connected with the MTP reactor 002, the MTP reactor 002 is connected with the thermoelectric conversion device through the steam pocket 004, gas subjected to primary cooling through the steam pocket 004 is discharged through a waste gas discharge pipeline after being subjected to secondary heat exchange cooling in the thermoelectric conversion device, wherein a pipeline used for directly conveying the regeneration gas to the steam pocket 004 and connected with the MTP reactor 002 in parallel is arranged between the regeneration gas heating furnace 001 and the steam pocket 004.
In order to control the flow of the regeneration gas in the pipeline, a reactor regeneration gas feeding valve set 201 is arranged between the regeneration gas heating furnace 001 and the MTP reactor 002, and a regeneration gas to drum feeding valve set 202 is arranged on the pipeline which is connected with the MTP reactor 002 in parallel. To ensure that the flow of the regeneration gas meets the production requirements.
The invention carries out primary temperature reduction on the regenerated waste gas output from the MTP reactor by arranging the steam pocket, thereby meeting the condition of thermoelectric conversion, further converting the heat energy of the regenerated waste gas into electric energy by the thermoelectric conversion device, and releasing the regenerated waste gas after utilization into the atmosphere through the waste gas discharge pipeline or entering a downstream device for subsequent treatment. Because the MTP reactor is intermittent in the output of the regenerated waste gas, in order to ensure the continuous operation of the thermoelectric conversion device, a pipeline which is used for directly conveying the fresh regenerated gas to the steam drum and is connected with the MTP reactor in parallel is arranged between the regenerated gas heating furnace and the steam drum, so that the real-time regenerated waste gas is ensured to flow through the thermoelectric conversion device, the phenomenon that the thermoelectric conversion device cannot normally operate in the switching process of the MTP reactor is avoided, and the technical problem that the difficulty of waste heat recovery and utilization is high due to the fact that the catalyst regeneration of the reactor is an intermittent process is solved.
In an alternative embodiment of the present invention, the thermoelectric conversion device comprises an evaporator 005, an expander 006, a condenser 007 and a working fluid pump 008, preferably, the evaporator 005 is an evaporator in an ORC power generation system. Evaporimeter 005 carries out the heat transfer through organic working medium and the gas of steam pocket 004 output and absorbs the heat to do work in expander 006, finally change heat energy into electric energy, condenser 007 sets up the low reaches at expander 006 for cool down the organic working medium of expander 006 output, working medium pump 008 pressurizes the organic working medium after the cooling via condenser 007, and carries gyration evaporimeter 005 department, in order to cool down the gas of steam pocket 004 output.
In a further alternative embodiment of the present invention, the thermoelectric conversion device further includes a preheater 009 disposed downstream of the working fluid pump 008 and in contact with the exhaust gas discharge line to preheat the working fluid. This setting of pre-heater 009 can preheat the organic working medium through working medium pump 008 backward flow to evaporimeter 005 and expander 006 department, can carry out thermal exchange with the regeneration waste gas that will flow into the exhaust gas discharge pipeline through pre-heater 009 simultaneously to increase the contact point of regeneration waste gas heat transfer, prolonged the time of heat exchange, improved the thermal exchange efficiency of regeneration waste gas, and then improved waste heat recovery's effect. Meanwhile, the waste heat utilization device for intermittently regenerated waste gas at least utilizes the steam drum and the thermoelectric conversion device to carry out primary waste heat utilization, and utilizes the preheater to carry out secondary waste heat utilization, thereby realizing the cascade utilization of the heat energy of the regenerated waste gas and further improving the utilization rate of the energy source of the waste heat utilization device for intermittently regenerated waste gas.
In an alternative embodiment of the present invention, the waste heat utilization apparatus includes a dust remover 003 disposed on a pipeline between the MTP reactor 002 and the drum 004 for removing dust from the gas transferred from the MTP reactor 002 to the drum 004. The dust remover 003 can treat dust or other impurities carried in the regenerated waste gas passing through the MTP reactor 002, thereby avoiding the technical problems of influence on heat transfer efficiency or blockage of a flow channel and long-term impact wear of the heat exchange tube due to the deposition of solid impurities carried in the regenerated waste gas passing through the MTP on the surface of the heat exchange tube.
In a further alternative embodiment of the present invention, the top of the duster 003 is provided with a pipe to the drum 004, and the pipe to the drum 004 to which the duster 003 is connected is provided with a duster top to drum valve set 203. The bottom of the dust collector 003 is provided with a solid impurity discharge line 102 for discharging solid impurities. The pipeline setting that dust remover 003 linked to vapour pocket 004 can be under the effect of gravity, and the regeneration waste gas that helps flowing through dust remover 003 carries out the deposit to its solid impurity that mix with under the effect of gravity, prevents that the gas that mixes with solid impurity from passing through the pipeline and entering into in the vapour pocket 004. The solid impurity pipeline 102 that will discharge sets up in the bottom of dust remover 003, conveniently emptys the deposit of the solid impurity in the dust remover 003 to can play better clearance effect under the effect of gravity, simultaneously, be favorable to and communicate to the pipeline of steam pocket 004 and separately set up with the farthest distance, avoid causing the pollution to the regeneration waste gas that gets into in the steam pocket 004 after the dust removal.
In order to improve the control of the cleaning of the solid impurities in the dust remover 003, a dust remover bottom solid impurity discharge valve group 204 is arranged between the dust remover 003 and the solid impurity discharge pipeline 102, and the solid impurities in the dust remover 003 are discharged to the solid impurity discharge pipeline 102 through the dust remover bottom solid impurity discharge valve group 204 to be controlled.
In an alternative embodiment of the invention, the waste heat utilization device comprises a boiler feed water line 104 for conveying boiler feed water from the battery limits to the drum 004 for heat exchange. The high-temperature regeneration waste gas heats water in a boiler water supply pipeline 104 from a boundary region, the generated saturated steam 103 is merged into a steam pipe network, and intermittent drum blowdown is realized through a drum blowdown valve group 205 on a drum blowdown line 105 at the bottom of a drum 004.
In an optional embodiment of the invention, when the fixed bed reactor catalyst is regenerated, fresh regeneration gas 101 is heated by a regeneration gas heating furnace 001 to reach the regeneration temperature, enters the top of the MTP reactor 002, sequentially penetrates through the bed layer from top to bottom, and reacts with the catalyst in the MTP reactor 002, the regeneration process improves the activity of the catalyst and the selectivity of propylene, the generated regeneration waste gas is output to a dust remover 003 from the bottom of the MTP reactor 002, the regeneration waste gas is subjected to solid impurity separation, the solid impurity is discharged through a dust remover bottom solid impurity discharge valve group 204 between solid impurity discharge pipelines 102 at the bottom of the dust remover 003, the regeneration waste gas after impurity removal enters a steam drum 004 from the top of the dust remover to a steam drum valve group 203, the high-temperature regeneration waste gas heats water in a boiler water supply pipeline 104 from a boundary region, and the generated saturated steam 103 is merged into a steam pipe network, the intermittent steam drum pollution discharge is realized through the steam drum pollution discharge valve bank 205 on the steam drum pollution discharge line 105 at the bottom of the steam drum 004, the temperature of high-temperature regeneration waste gas after waste heat utilization is reduced to below 200 ℃ to become low-temperature regeneration waste gas, the low-temperature regeneration waste gas exchanges heat with a low-boiling-point organic working medium at the coolant side of an evaporator 005 in an ORC power generation system, the organic working medium is gasified after absorbing heat, gaseous organic working medium outputs mechanical power outwards when expanding and reducing pressure in an expander 006 to drive a generator to generate power, the heat energy is finally converted into electric energy, the low-pressure organic working medium after expansion power generation is cooled into liquid in a condenser 007, a working medium pump 008 boosts the low-pressure liquid organic working medium to enable the organic working medium to enter a preheater 009 to exchange heat with the regeneration waste gas again, the preheater 009 serves as an organic working medium preheater and also serves as a cooler for the regeneration waste gas, and the preheated organic working medium enters the evaporator again, and the heat exchange is carried out with the regenerated waste gas, so that the circulating power generation is completed, and the maximization of waste heat utilization is realized. When the regeneration of the catalyst of one reactor is finished and the regeneration procedure of the catalyst of the other reactor is not started yet, no regeneration waste gas is generated in the short time period, in order to maintain the low-load operation of the generator set, fresh regeneration gas is introduced from the regeneration gas heating furnace 001 and enters the steam drum 004 from the regeneration gas of the bypass line of the MTP reactor 002 and the dust remover 003 to the steam drum feed valve group 202, and at the moment, the reactor regeneration gas feed valve group 201 at the top of the MTP reactor 002 and the dust remover top after the impurity removal of the dust remover 003 to the steam drum valve group 203 need to be closed.
In an alternative embodiment of the invention, as shown in fig. 3, the waste heat utilization device comprises a steam turbine 010 for energy conversion of the gas entering the drum 004. At this time, the saturated steam 103 generated by the steam drum 004 is not merged into a steam pipe network, but enters the steam turbine 010, steam power generation is realized by driving the steam turbine, and the generated condensed water is mixed with the boiler water supply pipeline 104 from the junior district through the mixer 011 and then is recycled and enters the steam drum 004 again, so that the purposes of fully saving water resources and utilizing waste heat resources are achieved.
In a further preferred embodiment of the invention, the end of the turbine 010 is provided with a mixer 011 for mixing the liquid generated by the gas cooling in the turbine 010 with boiler feed water from the battery limits. The steam in the steam turbine 010 is cooled to form liquid water, and the liquid water and the boiler feed water are mixed by the mixer 011, so that the liquid water generated by the steam turbine 010 is discharged and can be reused. The production process is effectively integrated, so that the subsequent process of liquid water recovery treatment is reduced.
In an alternative embodiment of the invention, the waste heat utilization device comprises a boiler feed water pipeline 104 for conveying boiler feed water from a battery compartment to a steam drum 004 for heat exchange, and the mixer 011 is communicated with the boiler feed water pipeline 104. Since the liquid water formed by cooling the steam from the turbine 010 contains a large amount of ions that are not suitable for direct introduction into the boiler for recycling, in a further alternative embodiment of the invention, a purification device is provided between the mixer 011 and the boiler feed water line 104.
The invention provides a waste heat utilization system for intermittently regenerating waste gas;
the waste heat utilization system comprises any one of the waste heat utilization devices for intermittently regenerating waste gas, wherein the regenerated gas heating furnace 001 is connected with fresh regenerated gas 101, the waste gas discharge pipeline is connected with the regenerated waste gas and discharges the regenerated waste gas to a torch pipeline 106 or the regenerated waste gas to an atmosphere pipeline 107, and the specific discharge path is determined according to whether the gas components of the regenerated waste gas meet the requirement of directly discharging the regenerated waste gas to the atmosphere.
The foregoing is illustrative of only alternative or preferred embodiments of the invention and is not to be construed as limiting thereof as numerous modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The waste heat utilization device for intermittently regenerating waste gas is characterized by comprising a regenerated gas heating furnace (001), an MTP (methanol to propylene) reactor (002), a steam pocket (004), a thermoelectric conversion device and a waste gas discharge pipeline;
the regeneration gas heating furnace (001) is connected with the MTP reactor (002), and the MTP reactor (002) is connected with the thermoelectric conversion device through the steam drum (004); the gas cooled by the steam drum (004) is discharged through a waste gas discharge pipeline after exchanging heat with the thermoelectric conversion device; wherein the content of the first and second substances,
and a pipeline which is used for directly conveying the regenerated waste gas to the steam drum (004) and is connected with the MTP reactor (002) in parallel is arranged between the regenerated gas heating furnace (001) and the steam drum (004).
2. The waste heat utilization device of intermittent regenerated waste gas according to claim 1, characterized in that the thermoelectric conversion device comprises an evaporator (005), an expander (006), a condenser (007) and a working medium pump (008), the evaporator (005) absorbs heat energy of the regenerated waste gas output by the steam pocket (004) through an organic working medium and applies work in the expander (006) to convert the heat energy into electric energy, the condenser (007) is arranged at the downstream of the expander (006) and is used for cooling the applied organic working medium output by the expander (006), and the working medium pump (008) pressurizes the organic working medium cooled by the condenser (007) and transmits the organic working medium back to the evaporator (005) to cool the gas output by the steam pocket (004).
3. The waste heat utilization device of intermittently regenerated exhaust gas as claimed in claim 2, wherein said thermoelectric conversion device further comprises a preheater (009) disposed downstream of said working fluid pump (008) and in contact with said exhaust gas discharge line to preheat the working fluid.
4. The waste heat utilization device for intermittent regeneration of exhaust gas according to claim 1, comprising a dust remover (003) disposed on a pipeline between the MTP reactor (002) and the drum (004) for removing dust from the regeneration exhaust gas transferred from the MTP reactor (002) to the drum (004).
5. The waste heat utilization device for intermittent regeneration waste gas according to claim 4, characterized in that a pipeline communicated to a steam drum (004) is arranged at the top of the dust remover (003), and a discharged solid impurity pipeline (102) for discharging solid impurities is arranged at the bottom of the dust remover (003).
6. The waste heat utilization device for intermittent regeneration of exhaust gas according to any one of claims 1 to 5, characterized in that the waste heat utilization device comprises a boiler feed water pipe (104) for conveying boiler feed water from battery limits to a steam drum (004) for heat exchange.
7. The waste heat utilization device for intermittent regeneration of exhaust gas according to claim 1, characterized in that it comprises a turbine (010) for energy conversion of the gas entering the drum (004).
8. The waste heat utilization device for intermittently regenerating exhaust gas according to claim 7, characterized in that the end of the steam turbine (010) is provided with a mixer (011) for mixing the liquid generated by cooling the gas in the steam turbine (010) with the boiler feed water from the battery limits.
9. The waste heat utilization device for intermittently regenerating exhaust gas according to claim 8, characterized in that it comprises a boiler feed water line (104) for delivering boiler feed water from a battery compartment into a drum (004) for heat exchange, and the mixer (011) communicates with the boiler feed water line (104).
10. The waste heat utilization device for intermittent regeneration of exhaust gas according to claim 9, characterized in that a purification device is provided between the mixer (011) and the boiler feed water line (104).
11. A waste heat utilization system for intermittently regenerated waste gas, characterized in that the waste heat utilization system comprises the waste heat utilization device for intermittently regenerated waste gas as claimed in any one of claims 1 to 10, the regenerated gas heating furnace (001) is connected with fresh regenerated gas (101), and the waste gas discharge pipeline is connected to a regenerated waste gas discharge to a flare pipeline (106) or a regenerated waste gas discharge to an atmosphere pipeline (107).
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