CN107726831A - A kind of low temperature exhaust heat processing method of dry tail gas - Google Patents
A kind of low temperature exhaust heat processing method of dry tail gas Download PDFInfo
- Publication number
- CN107726831A CN107726831A CN201710777900.0A CN201710777900A CN107726831A CN 107726831 A CN107726831 A CN 107726831A CN 201710777900 A CN201710777900 A CN 201710777900A CN 107726831 A CN107726831 A CN 107726831A
- Authority
- CN
- China
- Prior art keywords
- tail gas
- heat
- section
- waste heat
- circulating water
- 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
- 238000003672 processing method Methods 0.000 title abstract 2
- 239000007789 gas Substances 0.000 claims abstract description 120
- 239000002918 waste heat Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000001035 drying Methods 0.000 claims abstract description 45
- 239000000428 dust Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000007921 spray Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000001704 evaporation Methods 0.000 claims description 29
- 230000008020 evaporation Effects 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000012546 transfer Methods 0.000 claims description 22
- 238000005507 spraying Methods 0.000 claims description 20
- 238000004458 analytical method Methods 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 9
- 238000000889 atomisation Methods 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005367 electrostatic precipitation Methods 0.000 abstract 2
- 238000002663 nebulization Methods 0.000 abstract 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000004090 dissolution Methods 0.000 abstract 1
- 239000013618 particulate matter Substances 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 18
- 238000005406 washing Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 238000011084 recovery Methods 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 5
- 239000002912 waste gas Substances 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003534 oscillatory effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from 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
- B01D53/14—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 by absorption
- B01D53/1456—Removing acid components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a kind of low temperature exhaust heat processing method of dry tail gas, comprise the following steps：Step S1) tail gas is entered spray collection hot arc by drying equipment；Step S2) Sprayer Circulation water, particulate matter and sour gas in tail gas of dissolution；The tail gas that recirculated water enters after vacuum flashing section and processing enters nebulization dust section；Step S3) by the waste heat in vacuum flashing section collection recirculated water, and the recirculated water is back to the spray and collects hot arc；Step S4) atomised part recirculated water formation fog, make to enter the focusing particles sedimentation in tail gas, the tail gas after processing described in nebulization dust section and enter electrostatic precipitation section；Step S5) electrostatic precipitation processes are carried out to tail gas, and remaining circulation of tail gas is passed through to the spray collection hot arc.
Description
Technical Field
The invention relates to the field of tail gas treatment and the like, in particular to a low-temperature waste heat treatment method for dry tail gas.
Background
The drying of materials is one of the important production processes of chemical enterprises, and aims to remove moisture in certain raw materials, semi-finished products and finished products so that the materials are convenient to package, transport, store, process and use. The drying process relates to the fields of chemical industry, petrifaction, medicine, food, papermaking, wood, grain and agricultural and sideline product processing, building materials, environmental protection and the like. Drying is one of the unit operations that is energy intensive, since it is done by the action of heat to vaporize and remove moisture from the material. According to statistics, the total drying energy consumption of all the industries in British accounts for about 8% of the total energy consumption of the whole industrial system, and the drying energy consumption of China accounts for half of the total industrial energy consumption of British and is 12%. The drying energy utilization rate in the current general chemical industrial production of China is only 20-60%. The discharge of the drying process exhaust gas loses very high energy, and therefore, the drying exhaust gas waste heat utilization technology further promotes the improvement of the energy efficiency of the drying process. Therefore, the utilization of the waste heat of the drying exhaust gas is an important direction for the research of drying energy conservation.
Generally, the waste heat is divided into three types according to the temperature level of the tail gas: the high-temperature waste heat (500 ℃) is higher, the medium-temperature waste heat (200-500 ℃) is lower than the low-temperature waste heat (200 ℃). At present, the waste heat of the recycling of the waste heat mainly comes from high-temperature and medium-temperature waste heat, and the low-temperature waste heat (i.e. low-grade waste heat) is not recycled basically. Compared with high-grade and medium-grade heat sources, the low-grade waste heat has limited energy in the same unit, most of low-temperature waste heat is concentrated in the emission process of waste gas and waste water of enterprises, and the utilization difficulty is high, but from the energy utilization pattern, the low-grade waste heat accounts for more than 50-60% of the waste heat, so that the low-grade waste heat is taken as a key link of capacity and energy utilization, and plays an important role in the strategy of national energy conservation and emission reduction within thirteen-five periods.
The existing waste gas circulation energy-saving technology improves the energy utilization rate to a great extent, effectively saves energy, reduces the emission of waste gas, even if the temperature of the discharged dry tail gas is still as high as 150-180 ℃, meanwhile, the tail gas contains a certain amount of corrosive gas and dust, the tail gas is directly discharged after deacidification and dedusting by a filler washing tower, a large amount of quench water is consumed in the waste gas discharging process, a large amount of waste heat loss is caused, meanwhile, the service life of deacidification and dedusting equipment is reduced due to the acid gas contained at high temperature, and the operation cost of the device is higher.
The multi-effect energy-saving drying technology adopts combined drying, and two or more drying devices are used in series. The drying procedure is as follows.
In the primary drying process, high-temperature hot air enters the heat transfer pipe of the sealed drying bin to heat and dry the materials, and the hot air after being cooled in the heat transfer pipe and high-temperature steam in the drying bin are moved out of the drying bin through the induced draft fan to be mixed and then enter the secondary drying bin. The high-temperature high-humidity gas out of the first-stage drying bin enters a heat transfer pipe of the second-stage drying bin to heat the material, and the rest heat conduction dries the material to enable the heat energy to be utilized for the second time. The medium-temperature gas in the second-stage drying bin heating pipe is led out to a return air pipeline through a draught fan to enter a heating system, and is heated and recycled. The medium-temperature saturated steam in the second-stage drying bin enters the third-stage drying bin, the medium-temperature saturated steam in the heat transfer pipe is condensed to release latent heat of vaporization, and the latent heat of vaporization is transferred to the materials to be heated and dried, so that the heat energy is utilized for the third time. The outlet of the angular pipe in the third-stage drying bin is connected with a condenser, and the condenser is connected with a vacuum pump. The middle-temperature saturated vapor in the drying bin enters the condenser through the pipeline to be condensed, and then the condensed water is heated to be less than 50 ℃, and the middle-temperature condensed water can be used for bathing and heating, so that the heat energy can be utilized for the fourth time.
The multi-effect energy-saving drying technology mainly aims at the conditions that the dust content is small, the material content is small, and the dew point of tail gas at the final stage of drying is not high, so that the multi-effect energy-saving drying technology is widely applied to a tower type dryer of grains at present, and the total energy consumption of novel drying equipment is 20% -30% of that of the traditional drying technology equipment by the aid of the drying waste gas waste heat utilization technology. The energy utilization rate is very high. And aiming at the conditions that the material has high water content, much dust and high water content requirement after drying, the material cannot be used, and the tail gas cannot be used for many times due to the limitation of dew point and dust.
The heat pipe is a heat transfer element with high heat conductivity, transfers heat by evaporation and condensation of working medium in a totally-enclosed vacuum pipe shell, and has a series of advantages of extremely high heat conductivity, good isothermal property, freely changeable heat transfer areas on cold and hot sides, remote heat transfer, temperature control and the like. The energy-saving device is widely applied to industries such as metallurgy, chemical engineering, oil refining, boilers, ceramics, transportation, light textile, machinery and the like at present, and has remarkable economic benefit as energy-saving equipment for low-temperature waste heat recovery and heat energy utilization in the process. At present, the oscillatory flow heat pipe heat exchanger is developed aiming at the characteristics of the heat pipe and combining the characteristics of the dry tail gas in China. Typically, the tail gas from the dryer carries 80% of the total heat of the people transportation system, including the latent heat of the water vapor. The oscillatory flow heat pipe heat exchanger is used for recycling waste heat of the dried tail gas, the effect is obvious, and the waste heat recovery is more than 20%. However, in practical application, the heat pipe heat exchanger is greatly affected by the components of the heat carrier medium, such as low-temperature corrosion, dust deposition, scaling and the like of the pipe wall caused by cold and hot media, which directly affect the operation stability, reliability and service life of the heat pipe.
Disclosure of Invention
The purpose of the invention is: the low-temperature waste heat treatment method of the dry tail gas is provided to solve one or more technical defects in the prior art and achieve the purposes of fully recycling the low-temperature waste heat, saving energy and protecting environment.
The technical scheme for realizing the purpose is as follows: a low-temperature waste heat treatment method for dry tail gas comprises the following steps: step S1) leading the tail gas to enter a spraying heat collecting section through drying equipment; step S2), circulating water is sprayed to dissolve the particulate matters and the acid gases in the tail gas; circulating water enters a vacuum flash evaporation section, and treated tail gas enters an atomization dust removal section; step S3), collecting the waste heat in the circulating water through a vacuum flash evaporation section, and returning the circulating water to the spraying heat collection section; step S4), atomizing part of circulating water to form mist, enabling particles in the tail gas entering an atomizing and dust removing section to be gathered and settled, and enabling the treated tail gas to enter an electrostatic dust removing section; step S5) carrying out electrostatic dust collection treatment on the tail gas, and circularly introducing the residual tail gas into the spraying heat collecting section.
In a preferred embodiment of the present invention, the vacuum flash evaporation section in step S2) includes a computational fluid dynamics simulation system, which analyzes the flow of the tail gas and obtains an analysis result according to the components of the tail gas; and the waste heat exchanger is used for recovering waste heat above the dew point of the flue gas and flashing solution at the bottom of the treatment equipment to generate the negative pressure steam according to the analysis result of the computational fluid dynamics simulation system.
In a preferred embodiment of the present invention, the waste heat exchanger includes a medium channel box disposed at one end of the heat transfer module, and flue transition boxes disposed at upper and lower sides of the heat transfer module; and the upper end and the lower end of the flue transition box are respectively provided with a flue gas channel opening.
In a preferred embodiment of the present invention, the step S3) includes a step S31) of analyzing the flow of the exhaust gas according to the composition of the exhaust gas and obtaining an analysis result; step S32), according to the analysis result, recovering the waste heat above the dew point of the tail gas and flashing the solution at the bottom of the treatment equipment to generate the negative pressure steam.
In a preferred embodiment of the present invention, the step S32) includes a step S321) of evacuating the vacuum flash evaporation section according to the analysis result and heating the circulating water; step S322) generating negative pressure steam; step S323) heat dissipation and cooling are carried out on the negative pressure steam, and the heat dissipated is used as a partial heat source of the vacuum heat pump.
In a preferred embodiment of the present invention, in the step S1), the heat source of the drying device includes heat released by the negative pressure steam.
In a preferred embodiment of the present invention, in the step S3), the conveying power source of the circulating water is a vacuum heat pump in the vacuum flash evaporation section.
In a preferred embodiment of the present invention, the step S2) includes measuring the temperature, the air pressure and the exhaust gas flow of the spray heat collecting section.
In a preferred embodiment of the present invention, the step S2) includes measuring a level of circulating water in the vacuum flash section.
The invention has the advantages that: the low-temperature waste heat treatment equipment and the method for the dry tail gas combine the properties and the composition of the dry tail gas and the characteristics of dry materials, maximize the recovery of the waste heat of the tail gas and realize the standard emission of the tail gas. According to the heat source demand of a user after recovery, vacuum steam or electric power or dry tail gas preheating and drying air is achieved, analysis of an actual drying process and composition conditions of the dry tail gas are combined, special equipment is combined in a design process, a tail gas waste heat dew point is cut, a low-low temperature heat exchanger is adopted above the dew point for heat recovery, and integrated equipment is adopted at once for recovery. The dew point of the flue gas water and the dew point of the corrosive gas are fully considered in the redesign process, so that the optimization and maximization of the heat recovery process are realized; the acid dew point resistant ultralow-temperature heat exchange equipment, the efficient washing, the acid absorption, the vacuum flash evaporation, the wet electric dust removal technology, the vacuum flash evaporation steam technology and the like are organically combined together, so that the tail gas is ensured to be discharged up to the standard, and the heat energy of the dried tail gas is converted into steam or electric power for production in a maximized and optimized manner, so that the drying device becomes a clean, environment-friendly and energy-saving device; aiming at the characteristics of high humidity and low acid dew point of tail gas, an ultralow temperature waste heat boiler is developed to recover sensible heat according to different states of sensible heat and latent heat, the latent heat is recovered by utilizing circulation absorption of washing liquid and vacuum flash evaporation, the flash evaporation steam pressure is improved by adopting a low-temperature flash evaporation compression heat pump technology, and the heat energy is improved and converted. Aiming at the problem that the temperature of tail gas below a dew point is reduced to be below an acid dew point (generally 100-120 ℃), the dew point temperature of water vapor contained in spray-dried tail gas is 70-80 ℃, most of heat energy contained in the tail gas is latent heat of the steam which needs to be reduced to be below the dew point temperature of saturated steam, a washing tower, acid absorption, vacuum flash evaporation, circulating washing and wet electrostatic dust removal are combined, an efficient and water-saving deacidification, water vapor recovery, heat conversion and efficient dust removal integrated technology is developed, and dust and HCl are discharged up to the standard while the tail gas heat energy is utilized to the maximum. The low-temperature heat exchanger is made of 2205 duplex stainless steel and has a straight channel plate structure, so that the heat transfer efficiency is high, dust is not easy to accumulate, the corrosion and wear are prevented, the equipment structure is compact, the occupied space is small, the weight is light, and the installation and implementation are convenient; the smoke stroke is only 600-800 mm, the soot blowing is convenient and thorough, the reliability of the equipment is high, and the overhaul and maintenance amount is small; the problems of easy corrosion, easy dust accumulation, large pressure drop, large installation space and the like of the traditional finned tube heat exchanger are solved.
Drawings
The invention is further explained below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a low-temperature waste heat treatment device for dry tail gas according to an embodiment of the invention.
Fig. 2 is a top view of fig. 1.
FIG. 3 is a flow chart of the steps of the method for low temperature waste heat treatment of dry tail gas according to the embodiment of the method of the present invention.
Fig. 4 is a flowchart showing the detailed steps of step S3 in fig. 3.
Fig. 5 is a flowchart showing the detailed substeps of step S32 in fig. 4.
Wherein,
1, a vacuum flash evaporation section; 2, spraying and heat collecting section;
3, an atomization dust removal section; 4, an electrostatic dust removal section;
5, a thermometer; 6, a barometer;
7, a measuring meter; 11 a heat transfer module;
12 flue transition box; 13 tail gas channel port;
21 a nozzle; 22 liquid inlet;
23 liquid outlet.
Detailed Description
The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.
Example (b): the utility model provides a low temperature waste heat treatment device of dry tail gas, includes the tail gas treatment cavity, the tail gas treatment cavity is equipped with vacuum flash evaporation section 1, sprays heat collection section 2, atomizing dust removal section 3, electrostatic precipitator section 4 by supreme down in proper order.
In this embodiment, the spray heat collecting section 2 includes at least one layer of spray washing mechanism, the tail gas passes through the spray washing mechanism from bottom to top, the spray washing mechanism performs spray washing on the tail gas, and heat is enriched by the circulating water.
In this embodiment, the spraying and washing mechanism in the spraying and heat collecting section 2 has three layers, and the spraying and washing mechanism of each layer includes a plurality of nozzles 21, a liquid inlet 22 and a liquid outlet 23. The nozzle 21 is arranged on the wall of the tail gas treatment chamber and arranged around the circumference of the wall; the liquid inlet 22 is communicated with the nozzle 21; the liquid outlet 23 is communicated with the liquid inlet 22, and the liquid outlet 23 is connected to the vacuum heat pump. In this embodiment, the liquid outlet 23 is disposed at the bottom of the vacuum flash evaporation section 1, i.e., below the tail gas passage.
In this embodiment, the vacuum flash evaporation section 1 further includes a computational fluid dynamics simulation system and a waste heat exchanger. Wherein the computational fluid dynamics simulation system analyzes the flow of the exhaust gas and obtains an analysis result according to the components of the exhaust gas. And the waste heat exchanger is used for recovering waste heat above the dew point of the tail gas and flashing solution at the bottom of the treatment equipment to generate the negative pressure steam according to the analysis result of the computational fluid dynamics simulation system.
The waste heat exchanger comprises a heat transfer module 11, a medium pipe box, a flue transition box 12, a tail gas channel port 13, a liquid level meter and a vacuum heat pump. The medium pipe box is arranged at one end of the heat transfer module 11; the flue transition box 12 is arranged at the upper side and the lower side of the heat transfer module 11. And the upper end and the lower end of the flue transition box 12 are respectively provided with a tail gas channel port 13. The liquid level meter is used for measuring the liquid level of the circulating liquid at the bottom of the tail gas treatment chamber.
The heat transfer module 11 comprises at least one plate bundle module, the plate bundle module comprises a plurality of plates, and each plate comprises a main heat transfer surface, pressure-bearing corrugations uniformly distributed on the main heat transfer surface and range-dividing corrugations arranged at one end of the main heat transfer surface and extending towards the other end of the main heat transfer surface.
In the embodiment, the device further comprises a thermometer 5, a barometer 6, a metering gauge 7 and a liquid level meter, wherein the thermometer 5 is arranged in the spraying heat collecting section 2 and/or the atomizing dust removing section 3; for measuring the spray heat collecting section 2; the barometer 6 is arranged in the spraying heat collecting section 2 and is used for measuring the air pressure of the spraying heat collecting section 2 and/or the atomizing dust removing section 3; the meter 7 is arranged on the spraying heat collecting section 2 and the atomizing dust removing section 3 and is used for measuring the tail gas flow of the spraying heat collecting section 2 and/or the atomizing dust removing section 3. The liquid level meter is used for measuring the liquid level of circulating water in the vacuum flash evaporation section.
The atomization dust removal section 3 comprises an atomizer and is used for producing mist, condensing particles in the tail gas and dissolving part of acid gas in the tail gas. The electrostatic dust removal section 4 comprises an electrostatic dust removal net, and honeycomb-shaped dust removal holes are distributed in the electrostatic dust removal net.
In practical use, the tail gas enters the spraying and heat collecting section 2 through the tail gas passage port 13, the nozzle 21 of the spraying and heat collecting section 2 sprays circulating liquid, heat is enriched through the circulating water, the circulating water enters the vacuum flash evaporation section 1 under the action of gravity, the vacuum flash evaporation section 1 is vacuumized and heated by the vacuum heat pump, and negative pressure steam is generated, namely the negative pressure steam is used as a heat source of the vacuum heat pump in the vacuum flash evaporation section 1.
And after the circulating water is subjected to flash evaporation treatment and is cooled, the circulating water is conveyed by the vacuum heat pump and is recycled, the cooled tail gas sequentially enters the atomization dust removal section 3 and the electrostatic dust removal section 4 for further dust removal, and part of the tail gas passing through the electrostatic dust removal section 4 is introduced into the spraying heat collection section 2.
The treatment method realized by the low-temperature waste heat treatment equipment for the dry tail gas specifically comprises the following steps.
Step S1) the tail gas enters the spray heat collecting section 2 through the drying equipment.
In the present step S1), the heat source of the drying device includes heat released by the negative pressure steam, and the heat source of the drying device may further include an electric heating device, etc.
Step S2), circulating water is sprayed to dissolve the particulate matters and the acid gases in the tail gas; circulating water enters the vacuum flash evaporation section 1 and the treated tail gas enters the atomization dust removal section 3.
In the present step S2), the conveying power source of the circulating water is the vacuum heat pump in the vacuum flash evaporation section 1 in the step S3).
In the step S2), each layer of spray washing mechanism is provided with a thermometer 5, a barometer 6 and a meter 7, the thermometer 5 is used for measuring the temperature of the circulating water of the layer of spray washing mechanism or the temperature of the air in the spray heat collecting section 2, and the barometer 6 is used for measuring the air pressure in the spray heat collecting section 2 or the water pressure of the nozzles 21. The meter 7 is used for measuring the flow of the circulating water or the flow of the tail gas.
Step S3), collecting the residual heat in the circulating water through the vacuum flash evaporation section 1, and returning the circulating water to the spraying heat collection section 2.
This step S3) specifically includes the following steps:
s31) analyzing the flow of the tail gas according to the components of the tail gas and obtaining an analysis result. Specifically, in this embodiment, the flow of the exhaust gas is analyzed by the computational fluid dynamics simulation system, and an analysis result is obtained.
S32) according to the analysis result of the computational fluid dynamics simulation system, recovering waste heat above the dew point of the tail gas and flashing the solution at the bottom of the treatment equipment to generate the negative pressure steam. In this step, the generated negative pressure steam can be used as a heat source of the vacuum heat pump.
Specifically, S32) includes the following steps.
S321) vacuumizing the vacuum flash evaporation section 1 according to the analysis result, and heating circulating water.
S322) generating negative pressure steam.
S323) the negative pressure steam is used for heat dissipation and cooling, and the heat dissipated is used as a partial heat source of the vacuum heat pump.
Step S4), atomizing part of circulating water to form mist, so that particulate matters in the tail gas entering the atomizing and dust removing section 3 are gathered and settled, and the treated tail gas enters the electrostatic dust removing section 4. In this step S4), a meter 7 is also provided, and the meter 7 is used for measuring the flow rate of the tail gas in the atomizing dust-removing section 3.
Step S5) carrying out electrostatic dust collection treatment on the tail gas, and circularly introducing the residual tail gas into the spraying heat collecting section 2.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The low-temperature waste heat treatment method of the dry tail gas is characterized by comprising the following steps of:
step S1) leading the tail gas to enter a spraying heat collecting section through drying equipment;
step S2), circulating water is sprayed to dissolve the particulate matters and the acid gases in the tail gas; circulating water enters a vacuum flash evaporation section, and treated tail gas enters an atomization dust removal section;
step S3), collecting the waste heat in the circulating water through a vacuum flash evaporation section, and returning the circulating water to the spraying heat collection section;
step S4), atomizing part of circulating water to form mist, enabling particles in the tail gas entering an atomizing and dust removing section to be gathered and settled, and enabling the treated tail gas to enter an electrostatic dust removing section;
step S5) carrying out electrostatic dust collection treatment on the tail gas, and circularly introducing the residual tail gas into the spraying heat collecting section.
2. The low-temperature waste heat treatment method for dry tail gas according to claim 1, wherein the vacuum flash section in the step S2) comprises
The computational fluid dynamics simulation system analyzes the flow of the tail gas according to the components of the tail gas and obtains an analysis result;
and the waste heat exchanger is used for recovering waste heat above the dew point of the flue gas and flashing solution at the bottom of the treatment equipment to generate the negative pressure steam according to the analysis result of the computational fluid dynamics simulation system.
3. The low-temperature waste heat treatment method for the dry tail gas according to claim 2, wherein the waste heat exchanger comprises a medium pipe box and flue transition boxes, the medium pipe box is arranged at one end of the heat transfer module, and the flue transition boxes are arranged at the upper side and the lower side of the heat transfer module; and the upper end and the lower end of the flue transition box are respectively provided with a flue gas channel opening.
4. The low-temperature waste heat treatment method for dry tail gas according to claim 3, wherein the step S3) comprises the following steps,
step S31) analyzing the flow of the tail gas according to the components of the tail gas and obtaining an analysis result;
step S32), according to the analysis result, recovering the waste heat above the dew point of the tail gas and flashing the solution at the bottom of the treatment equipment to generate the negative pressure steam.
5. The low-temperature waste heat treatment method for dry tail gas according to claim 4, wherein the step S32) comprises the following steps,
step S321) vacuumizing the vacuum flash evaporation section according to the analysis result, and heating circulating water;
step S322) generating negative pressure steam;
step S323) heat dissipation and cooling are carried out on the negative pressure steam, and the heat dissipated is used as a partial heat source of the vacuum heat pump.
6. The method for low-temperature waste heat treatment of dry tail gas according to claim 5, wherein in the step S1), the heat source of the drying device comprises heat released by negative pressure steam.
7. The method for low-temperature waste heat treatment of the dry tail gas according to claim 5, wherein in the step S3), the conveying power source of the circulating water is a vacuum heat pump in the vacuum flash evaporation section.
8. The method for low-temperature waste heat treatment of the dry tail gas according to claim 1, wherein the step S2) comprises measuring the temperature, the air pressure and the tail gas flow of the spray heat collecting section.
9. The method for low-temperature waste heat treatment of dry tail gas according to claim 1, wherein the step S2) comprises measuring the level of circulating water in the vacuum flash section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710777900.0A CN107726831A (en) | 2017-09-01 | 2017-09-01 | A kind of low temperature exhaust heat processing method of dry tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710777900.0A CN107726831A (en) | 2017-09-01 | 2017-09-01 | A kind of low temperature exhaust heat processing method of dry tail gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107726831A true CN107726831A (en) | 2018-02-23 |
Family
ID=61204872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710777900.0A Pending CN107726831A (en) | 2017-09-01 | 2017-09-01 | A kind of low temperature exhaust heat processing method of dry tail gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107726831A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112452124A (en) * | 2020-12-11 | 2021-03-09 | 石家庄市新星化炭有限公司 | Drying denitration method in carbon black production and carbon black production system |
| CN112979139A (en) * | 2021-02-26 | 2021-06-18 | 徐敬玉 | Zero-emission sludge drying system adopting solution absorption-vapor compression combined cycle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140000461A1 (en) * | 2012-06-25 | 2014-01-02 | National Engineering Research Center of Drying Technology and Equipment | Dehumidifying tower for exhaust gas |
| CN206001881U (en) * | 2016-08-16 | 2017-03-08 | 宜宾丝丽雅股份有限公司 | Viscose staple fiber drying system |
| CN106564979A (en) * | 2015-10-08 | 2017-04-19 | 中国科学院大连化学物理研究所 | Integrated refrigeration, dehumidification and pure water preparation system using solar energy or low-temperature heat source |
| CN206131683U (en) * | 2016-10-31 | 2017-04-26 | 黄剑春 | Heat pump stoving computer lab and heat pump stoving circulation computer lab |
| CN106900567A (en) * | 2017-03-28 | 2017-06-30 | 湖南农业大学 | A kind of environmentally friendly pig house and implementation method |
| CN107023817A (en) * | 2016-02-01 | 2017-08-08 | 天津华赛尔传热设备有限公司 | A kind of straight passage structures low-level (stack-gas) economizer |
-
2017
- 2017-09-01 CN CN201710777900.0A patent/CN107726831A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140000461A1 (en) * | 2012-06-25 | 2014-01-02 | National Engineering Research Center of Drying Technology and Equipment | Dehumidifying tower for exhaust gas |
| CN103505987A (en) * | 2012-06-25 | 2014-01-15 | 天华化工机械及自动化研究设计院有限公司 | Moisture-containing tail gas dehumidifying tower |
| CN106564979A (en) * | 2015-10-08 | 2017-04-19 | 中国科学院大连化学物理研究所 | Integrated refrigeration, dehumidification and pure water preparation system using solar energy or low-temperature heat source |
| CN107023817A (en) * | 2016-02-01 | 2017-08-08 | 天津华赛尔传热设备有限公司 | A kind of straight passage structures low-level (stack-gas) economizer |
| CN206001881U (en) * | 2016-08-16 | 2017-03-08 | 宜宾丝丽雅股份有限公司 | Viscose staple fiber drying system |
| CN206131683U (en) * | 2016-10-31 | 2017-04-26 | 黄剑春 | Heat pump stoving computer lab and heat pump stoving circulation computer lab |
| CN106900567A (en) * | 2017-03-28 | 2017-06-30 | 湖南农业大学 | A kind of environmentally friendly pig house and implementation method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112452124A (en) * | 2020-12-11 | 2021-03-09 | 石家庄市新星化炭有限公司 | Drying denitration method in carbon black production and carbon black production system |
| CN112979139A (en) * | 2021-02-26 | 2021-06-18 | 徐敬玉 | Zero-emission sludge drying system adopting solution absorption-vapor compression combined cycle |
| CN112979139B (en) * | 2021-02-26 | 2022-06-28 | 徐敬玉 | Zero-emission sludge drying system adopting solution absorption-vapor compression combined cycle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103721538A (en) | Integrated treatment and utilizing device for recovering and denitrating smoke waste heat and condensate water of natural gas | |
| CN106474860A (en) | Wet desulfurization flue gas processing system and processing method | |
| CN108970369A (en) | A kind of multisection type high-humidity gas fume device for deep cleaning and its purification process | |
| CN110124465B (en) | Low-energy-consumption wet flue gas water-receiving and white-removing device and method | |
| CN202482236U (en) | Drying device for soya bean protein powder | |
| CN206430578U (en) | A kind of vent gas treatment tower | |
| CN112239242B (en) | Desulfurization wastewater zero-discharge system for gradient utilization of flue gas waste heat and working method thereof | |
| CN110124347B (en) | Water-saving energy-saving type flue gas purifying device and method | |
| CN209576258U (en) | A kind of multisection type high-humidity gas fume device for deep cleaning | |
| CN108939889A (en) | A kind of solution deep dehumidifying smoke processing system | |
| CN111578558A (en) | Multistage heat pump coupling flue gas waste heat recovery system | |
| CN107726831A (en) | A kind of low temperature exhaust heat processing method of dry tail gas | |
| CN210512728U (en) | Flue gas waste heat recovery utilizes system after wet flue gas desulfurization | |
| CN107606928A (en) | A kind of low temperature exhaust heat processing equipment of dry tail gas | |
| CN110550847A (en) | Energy-saving heat pump sludge drying system | |
| CN208742284U (en) | A kind of single column washing Wet fume sweetening dust remover of no stock tank secondary cycle | |
| CN108178213A (en) | Calcium chloride wastewater is concentrated and dried thermal energy coupling device | |
| CN211084113U (en) | Energy-saving and water-saving smoke white-eliminating system | |
| CN110772938A (en) | Intensive smoke plume treatment and purification system and method | |
| CN203653403U (en) | Dyeing sludge drying equipment | |
| CN203959868U (en) | Strong brine processing system | |
| CN215365442U (en) | Sludge drying system | |
| CN212227549U (en) | Device for condensation, dehumidification, drying and condensate recovery after evaporation | |
| CN115419907A (en) | Waste heat recovery takes off white clean system | |
| CN210267297U (en) | Flue gas treatment device |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180223 |