CN113932244A - Flue gas waste heat degree of depth recovery system - Google Patents

Flue gas waste heat degree of depth recovery system Download PDF

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Publication number
CN113932244A
CN113932244A CN202111338224.XA CN202111338224A CN113932244A CN 113932244 A CN113932244 A CN 113932244A CN 202111338224 A CN202111338224 A CN 202111338224A CN 113932244 A CN113932244 A CN 113932244A
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China
Prior art keywords
flue gas
spray
temperature
water tank
assembly
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CN202111338224.XA
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Chinese (zh)
Inventor
李智林
闫泽峰
田利涛
齐咏生
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Inner Mongolia Hongrui Energy Saving Technology Co ltd
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Inner Mongolia Hongrui Energy Saving Technology Co ltd
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Priority to CN202111338224.XA priority Critical patent/CN113932244A/en
Publication of CN113932244A publication Critical patent/CN113932244A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/265—Drying gases or vapours by refrigeration (condensation)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • 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
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)

Abstract

The application relates to a flue gas waste heat degree of depth recovery system includes: the device comprises a shell, wherein a flue gas channel is arranged in the shell, and a spray assembly for spraying and cooling the flue gas is arranged in the flue gas channel; the bottom of the shell is provided with a water tank for receiving spray water, and the water tank is connected with a circulating heat exchange assembly through a pipeline. Through the spraying assembly who directly sprays the cooling to the flue gas that sets up, constituted the heat transfer of flue gas, can be with the heat recovery in the flue gas to spraying the aquatic, effectively improved heat transfer efficiency through the form of direct gas-liquid contact, can release the heat in the flue gas more fully. Spray water after the flue gas sprays the cooling is saved through the water tank, has realized the heat accumulation function, and the circulation heat exchange assembly who connects through the water tank can form the secondary heat transfer, makes spray water's heat accumulation energy shift to the outside through the form of circulation heat transfer, has effectively reduced the temperature of spray water behind the transfer heat, is favorable to the direct recovery to the flue gas heat, has ensured the recovery effect of flue gas waste heat.

Description

Flue gas waste heat degree of depth recovery system
Technical Field
The application relates to the technical field of waste heat recovery, in particular to a flue gas waste heat deep recovery system.
Background
The heat loss of coal-fired and gas-fired boilers mainly includes heat loss of exhaust gas, heat loss of pollution discharge, heat loss of incomplete combustion, heat loss of heat dissipation and the like. The boiler has large influence on the thermal efficiency of the boiler, and is easy to recycle the heat loss of the exhaust smoke and the heat loss of the exhaust pollution. At present, the exhaust gas temperature of a gas-fired boiler is generally about 200 ℃, and the heat loss of the exhaust gas is more than 10%; when the exhaust gas temperature is higher, the water vapor can not be condensed to release latent heat energy, and the latent heat energy is discharged along with the exhaust gas, so that the heat energy is wasted. And a large amount of sensible heat is also carried, and is also discharged along with smoke, namely the phenomenon of so-called 'white smoke'.
In the prior art, a plurality of flue gas waste heat recovery devices are arranged, but a heat conduction system which is not in direct contact is adopted in the aspect of heat exchange, so that the heat exchange effect is low; the flue gas waste heat recovery device generally only comprises a circulating heat exchange system, and the heat utilization rate is not high.
In addition, most of the existing flue gas waste heat recovery technologies of gas boilers and coal-fired boilers have high cold source temperature, cannot deeply cool flue gas, and have serious problems of corrosion of heat exchangers.
Disclosure of Invention
An object of the embodiment of this application is to provide a flue gas waste heat degree of depth recovery system, has realized automatic waste heat recovery function, thermal recovery efficiency in the very big improvement flue gas.
The invention provides a flue gas waste heat deep recovery system, which comprises: a shell body, a plurality of first connecting rods and a plurality of second connecting rods,
a flue gas channel is arranged in the shell, and a spray assembly for spraying and cooling flue gas is arranged in the flue gas channel;
the bottom of the shell is provided with a water tank for receiving spray water, and the water tank is connected with a circulating heat exchange assembly through a pipeline.
In a further embodiment, the spray assembly comprises a high-temperature section spray assembly and a low-temperature section spray assembly, and a flue gas baffle plate is arranged in front of the high-temperature section spray assembly and the low-temperature section spray assembly.
In a further embodiment, a flue gas inlet is arranged on the side of the shell, a flue gas outlet is arranged on the top of the shell, the high-temperature section spraying assembly is arranged on the inner side of the flue gas inlet, and the low-temperature section spraying assembly is arranged on the lower portion of the flue gas outlet.
In a further embodiment, a gas-liquid mixing assembly is further arranged between the high-temperature stage spraying assembly and the low-temperature stage spraying assembly, the gas-liquid mixing assembly comprises a bubble nozzle and a gas-liquid mixing sieve plate, the bubble nozzle is mounted on the side wall of the shell, and the gas-liquid mixing sieve plate is located below the bubble nozzle and arranged in the flue gas channel.
In a further embodiment, the two flue gas baffle plates are staggered at intervals, each flue gas baffle plate is arranged obliquely relative to a horizontal plane, one flue gas baffle plate is connected with the bottom of the gas-liquid mixing sieve plate, and the other flue gas baffle plate is connected to the water tank.
In a further embodiment, the water tank includes a high-temperature water tank and a low-temperature water tank for receiving the spray water of the high-temperature spray assembly and the spray water of the low-temperature spray assembly, and the circulating heat exchange assembly includes a circulating pump and a heat exchanger respectively corresponding to the high-temperature water tank and the low-temperature water tank.
In a further embodiment, a spray pipe is connected between the heat exchanger and the shell, the spray assembly comprises a spray branch pipe connected to the spray pipe and a nozzle installed on the spray branch pipe, and the spray branch pipe is detachably connected with the spray pipe through a flange.
In a further embodiment, the spray pipe is connected with a gas-liquid mixing branch pipe, the bubble nozzle is connected to the gas-liquid mixing branch pipe, a plurality of through holes are uniformly distributed on the gas-liquid mixing sieve plate, and the bubble nozzle comprises a butterfly nozzle arranged below the low-temperature section spray assembly.
In a further embodiment, the heat exchanger comprises a high-temperature section heat exchanger and a low-temperature section heat exchanger, and the spray pipe comprises a high-temperature section spray pipe and a low-temperature section spray pipe which are respectively connected to the high-temperature section heat exchanger and the low-temperature section heat exchanger;
the heat exchanger is connected with a tap water inlet pipeline and a tap water outlet pipeline, an electric control valve is installed on the tap water inlet pipeline, a temperature sensor is installed on the tap water outlet pipeline, and the electric control valve and the temperature sensor are electrically connected with the control module.
In a further embodiment, the device further comprises a dosing device, a dosing pipeline is connected between the dosing device and the water tank, a pH value sensor is installed in the water tank, and the pH value sensor is electrically connected with the control module.
According to the deep recovery system for the waste heat of the flue gas, the spray assembly which is used for directly spraying and cooling the flue gas is arranged, so that primary heat exchange of the flue gas is formed, the heat in the flue gas can be recovered into spray water, the heat transfer efficiency is effectively improved in a direct gas-liquid contact mode, and the heat in the flue gas can be more fully released.
Spray water after the flue gas sprays the cooling is saved through the water tank, has realized the heat accumulation function, and the circulation heat exchange assembly who connects through the water tank can form the secondary heat transfer, makes spray water's heat accumulation energy shift to the outside through the form of circulation heat transfer, has effectively reduced the temperature of spray water behind the transfer heat, and spray water after the heat transfer can the secondary cycle to spray assembly, more is favorable to more retrieving the thermal direct of flue gas, has ensured the recovery effect of flue gas waste heat.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a deep flue gas waste heat recovery system provided in an embodiment of the present application;
FIG. 2 is a schematic view of an internal structure of a housing and a water tank provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a spray assembly provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a bubble nozzle of a gas-liquid mixing device provided in an embodiment of the present application.
Icon:
1-a shell; 2-a circulating heat exchange assembly; 3-a dosing device; 4-a flue gas outlet; 5-a flue gas channel; 6-a flue gas baffle plate; 6-1-high temperature flue gas baffle plate; 6-2-low temperature flue gas baffle plate; 7-a flue gas inlet; 8-a spray assembly; 9-cover plate of water tank; 10-high temperature water tank; 11-a low-temperature water tank; 12-a lance body; 13-spray gun nozzle; 14-a blind flange; 15-a spray pipe; 16-an electric regulating valve; 17-a temperature sensor; 18-the mains water pipe; 18-1-tap water inlet pipe; 18-2-tap water outlet pipe; 19-a heat exchanger; 20-a circulating pump; 21-a flange; 22-a dosing pipeline; 23-a dosing pump; 24-a liquid medicine tank; 25-a stirring pump; 26-a bubble nozzle; 27-a screw; 28-a butterfly nozzle; 29-a nut; 30-a nozzle support block; 31-gas-liquid mixing sieve plate; 32-gas-liquid mixing manifold.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1 to 4, the deep flue gas waste heat recovery system provided in the embodiment of the present application includes: the device comprises a shell 1, wherein a flue gas channel 5 is arranged in the shell 1, and a spray assembly 8 for spraying and cooling flue gas is arranged in the flue gas channel 5; the bottom of the shell 1 is provided with a water tank for receiving spray water, and the water tank is connected with a circulating heat exchange assembly 2 through a pipeline.
Flue gas waste heat degree of depth recovery system in this application, mainly used carries out waste heat recovery to the heat in the flue gas to when solving the fume emission white smoke problem, guarantee to retrieve thermal effective utilization.
Through spray assembly 8 in this application, can directly retrieve the waste heat in the flue gas to the form of the primary heat transfer that sprays to the flue gas with the shower water, can greatly improve heat exchange efficiency through the form of gas-liquid direct contact. Meanwhile, secondary emission reduction of the flue gas can be realized by directly spraying the flue gas, and the phenomenon of white smoke emission is basically eliminated along with a large amount of condensation of moisture in the flue gas cooling process.
Set up the water tank that is used for accepting the shower water in 1 bottom of casing, can carry out the secondary heat transfer to the heat that sprays the aquatic and retrieve, through being connected water tank and circulation heat exchange assembly 2, can make the heat accumulation of shower water in the water tank utilize through the form of extrinsic cycle, can carry out the heat accumulation through supplying water to the outside like the form of running water heating and utilize on the one hand in the extrinsic cycle heat transfer process, on the other hand can also reduce the temperature of shower water when the circulation returns to spray assembly 8, thereby reach circulation output low temperature cold source, promote the technical purpose of once spraying the heat transfer effect.
The spray assembly 8 specifically comprises a high-temperature section spray assembly and a low-temperature section spray assembly, and a flue gas baffle plate 6 is arranged between the high-temperature section spray assembly and the low-temperature section spray assembly. The flue gas baffle plate 6 can distinguish the high-temperature section and the low-temperature section of the flue gas, and a two-stage circulating heat exchange system of the high-temperature section and the low-temperature section is formed, so that the heat in the flue gas can be more fully utilized, the energy is saved, and the heat exchange efficiency is effectively improved.
In this embodiment, two flue gas baffle plates 6 arranged at an interval up and down are specifically adopted to divide the flue gas channel 5 into a high temperature section and a low temperature section, and the flue gas baffle plate 6 specifically comprises a high temperature flue gas baffle plate 6-1 located below and a low temperature flue gas baffle plate 6-2 located above.
A flue gas inlet 7 is formed in the side portion of a shell 1, a flue gas outlet 4 is formed in the top portion of the shell 1, a high-temperature flue gas baffle plate 6-1 is arranged at a position close to the flue gas inlet 7, a high-temperature section spraying assembly 6-2 is arranged on the inner side of the shell 1 of the flue gas inlet 7 and is specifically arranged between the two flue gas baffle plates 6, a low-temperature section spraying assembly 8 is arranged on the lower portion of the flue gas outlet 4 and is located above the low-temperature flue gas baffle plate 6-2, and the low-temperature flue gas baffle plate 6-2 and the high-temperature flue gas baffle plate 6-1 are obliquely arranged with an included angle of 30 degrees with the horizontal plane. Through this kind of mode of setting, on the one hand can promote to form the two-stage of high temperature section and low temperature section and spray, on the other hand can make two-stage shower water fall respectively to the high temperature water tank 10 and the low temperature water tank 11 of casing 1 bottom in.
In order to strengthen the contact between spray water and the flue gas, make the heat in the flue gas can obtain absorbing more fully, still be provided with the gas-liquid mixture subassembly between high temperature section spray assembly and low temperature section spray assembly, can constitute the irregular torrent of gas-liquid mixture through the gas-liquid mixture subassembly, strengthen the contact between flue gas and the spray water, concretely, the gas-liquid mixture subassembly includes bubble nozzle 26 and gas-liquid mixture sieve 31, form the torrent of gas-liquid through the cooperation between the two and mix, its main objective is the integration of the more abundant flue gas and water of realization, produce turbulent motion in the gas-liquid mixture field, promotion gas-liquid heat exchange that can be better, raise the efficiency more than 20%. Wherein the bubble jet nozzles 26 are mounted on the side wall of the housing 1 and the gas-liquid mixing sieve plate 31 is located below the bubble jet nozzles 26 and is arranged in the flue gas channel 5.
In the embodiment, the low-temperature flue gas baffle plates 6-2 and the high-temperature flue gas baffle plates 6-1 are arranged at intervals in a staggered manner, the low-temperature flue gas baffle plates 6-2 are connected with the gas-liquid mixing sieve plate 31, specifically, the side edges of the low-temperature flue gas baffle plates 6-2 are connected with the side edges of the gas-liquid mixing sieve plate 31 and are simultaneously connected to the inner side wall of the shell 1; the high-temperature flue gas baffle plate 6-1 is connected above the water tank, a flue gas baffle plate is vertically arranged on the position, opposite to the flue gas inlet 7, of the water tank, the high-temperature flue gas baffle plate 6-1 is obliquely connected to the top end of the flue gas baffle plate, the low-temperature flue gas baffle plate 6-2 and the high-temperature flue gas baffle plate 6-1 can play a good role in guiding flow, and two stages of spray water are respectively guided into the two water tanks with different temperatures.
The combination of two flue gas baffling boards 6 that the slope set up can make the shower water that high temperature section spray assembly 8 produced flow into high temperature water tank 10 in, make the shower water that low temperature section spray assembly 8 produced simultaneously flow into low temperature water tank 11 in, further carry out the cooling of circulation retrieval and utilization shower water respectively through extrinsic cycle heat exchange assembly 2 and cool down.
The circulating heat exchange assembly 2 specifically comprises two sets of circulating pumps 20 and heat exchangers 19, wherein each set of circulating pump 20 and each set of heat exchanger 19 correspond to the high-temperature water tank 10 and the low-temperature water tank 11 respectively. A spray pipe 15 is connected between the heat exchanger 19 and the shell 1 and used for returning spray water after heat exchange and cooling to the spray assembly 8 again, the spray assembly 8 comprises a spray branch pipe connected to the spray pipe 15 and a nozzle installed on the spray branch pipe, and the spray branch pipe is detachably connected with the spray pipe 15 through a flange 21. Spray branch pipe in this embodiment specifically is connected through blind flange 21 before with shower 15, and spray branch pipe is far less than flange 21 diameter with spray 15's pipe diameter, can dismantle the form of connection through blind flange 21, has made things convenient for spray set 8's dismouting on the one hand, and more importantly can adjust the jet direction of nozzle, combines the incline direction of flue gas baffling board 6, can make spray water lead-in respectively in high temperature water tank 10 and the low temperature water tank 11 when carrying out accurate cooling to getting into the flue gas and spraying.
The spray water of the gas-liquid mixing component is supplemented through the spray pipe 15, the spray pipe 15 is connected with a gas-liquid mixing branch pipe 32, the bubble nozzle 26 is connected on the gas-liquid mixing branch pipe 32, a plurality of through holes are uniformly distributed on the gas-liquid mixing sieve plate 31, and the bubble nozzle 26 comprises a butterfly nozzle 28 arranged below the low-temperature section spray component 8.
The heat exchanger 19 comprises a high-temperature section heat exchanger and a low-temperature section heat exchanger, the spray pipe 15 comprises a high-temperature section spray pipe 15 and a low-temperature section spray pipe 15 which are respectively connected with the high-temperature section heat exchanger and the low-temperature section heat exchanger, and the gas-liquid mixing branch pipe is specifically connected with the low-temperature section spray pipe 15 positioned above.
From the perspective of utilizing the heat of spray water in the secondary heat exchange water tank, a tap water inlet pipeline 18-1 and a tap water outlet pipeline 18-2 are connected to the heat exchanger 19 to heat externally supplied tap water, an electric regulating valve 16 is installed on the tap water inlet pipeline 18-1 and used for supplying external water to the system, a temperature sensor 17 is installed on the tap water outlet pipeline 18-2 and used for monitoring the temperature of the heated tap water, and the electric regulating valve 16 and the temperature sensor 17 are both electrically connected with a control module of the flue gas waste heat deep recovery system and used for automatically adjusting whether the electric regulating valve 16 is opened or not through the control module and feeding back the temperature of the heated tap water.
Based on the structure of the deep recovery system for flue gas waste heat, the composition and the working principle of each part are explained below.
In the spraying part of the primary heat exchange, pressure type liquid level meters are respectively arranged inside the high-temperature water tank 10 and the low-temperature water tank 11 for liquid level measurement. And water conveying pipelines are connected between the two groups of water tanks and the circulating pump 20 respectively, and the water in the water tanks is self-circulated through the circulating pump 20. The water tank upside that is located the casing 1 outside is provided with water tank cover plate 9, and the water tank top that is located the casing inside is provided with the opening that directly communicates flue gas passageway 5, and the lateral part that is located the casing 1 below is provided with inlet for flue gas 7, and exhanst gas outlet 4 has been seted up at casing 1 top, and inlet for flue gas 7 and exhanst gas outlet 4 are open wide-mouthed structure, through the collection and the emission of the flue gas of being convenient for of wide-mouthed design. Two groups of heat exchange spray assemblies 8 are embedded in the flue gas channel 5, and two flue gas baffle plates 6 forming an included angle of 30 degrees with the horizontal plane are arranged in the middle of the flue gas channel.
The inside of the shell 1 is respectively provided with: a flue gas low-temperature section, a low-temperature flue gas baffle plate 6-2, a flue gas high-temperature section, a low-temperature water tank 11 and a high-temperature water tank 10. The high-temperature heat exchange area and the low-temperature heat exchange area are divided by a flue gas baffle plate 6, high-temperature flue gas enters a high-temperature section in a flue gas channel 5 through a flue gas inlet 7, first cooling is realized under the water drop spraying effect of a high-temperature section spraying assembly 8, and water with higher temperature flows into a high-temperature water tank 10 along the high-temperature flue gas baffle plate 6-1. The flue gas then enters the low temperature section, in order to realize more sufficient fusion of the flue gas and the water and enable the flue gas and the water to generate turbulent fusion, a gas-liquid mixing assembly formed by the bubble nozzle 26 and the gas-liquid mixing sieve plate 31 is arranged in the low temperature region, and the turbulent fusion device is formed by matching the gas-liquid mixing assembly and the gas-liquid mixing assembly, so that the gas-liquid heat exchange can be better promoted, and the efficiency is improved by more than 20%.
The working principle of the low-temperature spraying water tank is the same as that of the high-temperature area, and the low-temperature spraying water with a certain temperature obtained through spraying heat exchange flows into the low-temperature water tank 11 under the action of the low-temperature section spraying assembly 8. Through carrying out the separation of high temperature section and low temperature section with 1 inside science of casing, realize high temperature and microthermal demand heat transfer, guaranteed energy-conserving effect more, internally designed's gas-liquid mixture subassembly and spray assembly 8 have realized the direct contact of flue gas with spray water simultaneously, compare in traditional indirect heat transfer's form, have greatly improved heat exchange efficiency, also make waste heat utilization rate increase substantially.
High temperature section spray assembly 8 and low temperature section spray assembly 8 equally divide and respectively include spray gun body of a gun 12, spray gun nozzle and blind flange 14 by spray branch pipe formation, and every group spray assembly 8 respectively is equipped with two spray gun bodies of a gun 12, respectively installs two spray gun nozzles 13 on every spray gun body of a gun 12, and the material of spray gun nozzle 13 is 316L stainless steel, and the injection angle design is 105, can cover flue gas passageway 5 more fully, promotes and sprays the effect. The spray gun body 12 is connected with the spray pipe 15 through the blind flange 14 and is fixed through bolts, so that the spray gun is convenient to detach and clean, the sealing performance is good, and the spray angle of the spray gun nozzle 13 can be adjusted conveniently.
The spray gun nozzle 13 of the invention is in a solid cone shape consisting of small water drops, and compared with the traditional virtual cone, the spray effect has better spray effect, and the contact area of the small water drops and the flue gas can be increased, thereby realizing the reduction of the flue gas temperature. 4 spray gun nozzles 13 are respectively arranged in the low-temperature heat exchange area and the high-temperature heat exchange area, so that the whole low-temperature heat exchange area and the whole high-temperature heat exchange area can be effectively covered, the effect that the heat exchange area has no dead angle is achieved, and the heat exchange efficiency of the flue gas and the water can be further improved.
The gas-liquid mixing device of the primary heat exchange part mainly comprises a bubble nozzle 26 and a gas-liquid mixing sieve plate 31, wherein the bubble nozzle 26 is connected with a gas-liquid mixing branch pipe, the bubble nozzle 26 is connected to the tail end of the gas-liquid mixing branch pipe and is fixed through a nozzle supporting block 30, the bubble nozzle 26 in the embodiment is specifically a butterfly nozzle 28 and is fixed on the nozzle supporting block 30 through a screw 27 and a nut 29, and the bubble nozzle 26 mainly sprays spray water in the horizontal direction.
The main structure of the gas-liquid mixing sieve plate 31 is a metal plate, the metal plate is evenly provided with the air holes in the form of through holes, the flue gas continuously rises at the low-temperature section of the flue gas and passes through the gas-liquid mixing sieve plate 31 to be mixed with the spray water in the horizontal direction of certain pressure sprayed by the bubble nozzle 26 to form irregular turbulence, so that the two fluids are prevented from flowing respectively, the flue gas and the spray water cannot form respective channels, and the gas-liquid contact effect is ensured more. In addition, turbulence increases the mixing area, allowing for more efficient heat exchange.
The gas-liquid mixing sieve plate 31 is made of acid and alkali resistant 316L stainless steel, a numerical control laser cutting machine is adopted to process circular through holes, the diameter of each through hole is 15mm, and the center distance between the through holes is 17 mm. The through-hole supplies flue gas and spray water to pass through, the spray water is by spray gun nozzle and bubble nozzle 26 blowout, solution descends to gas-liquid mixture sieve 31 and the reciprocal contact of flue gas, the spray water forms the splash state of similar splash in the collision zone and splashes all around, the tiny water droplet that splashes and form contacts with the flue gas that passes the through-hole, adsorb the particulate matter in the flue gas, and absorb the heat in the flue gas to the spray water liquid droplet, make spray water and flue gas mix fully, thereby realize more abundant heat exchange.
The secondary heat exchange part mainly comprises a water conveying pipeline, a plate type heat exchanger 19, a circulating pump 20, a tap water pipeline 18 and a spraying pipe 15, wherein the tap water pipeline 18 comprises a tap water inlet pipeline 18-1 and a tap water outlet pipeline 18-2, an electric regulating valve 16 is installed on the tap water inlet pipeline 18-1, and a temperature sensor 17 is installed on the tap water outlet pipeline 18-2.
Two groups of parallel circulating pumps 20 are connected with a plate heat exchanger 19 through pipelines and are connected and sealed through a flange 21, and one end of the plate heat exchanger 19 is connected with a spray assembly 8 through a spray pipe 15 to provide spray water; the other end of the water inlet pipe is connected with a tap water pipe 18, an electric regulating valve 16 is installed on the tap water inlet pipe 18-1, and a temperature sensor 17 is installed on the tap water outlet pipe 18-2, wherein the temperature sensor 17 in the embodiment is a platinum thermal resistor of PT100 type, and is used for controlling the supply of tap water and monitoring the outlet water temperature of the tap water after secondary heat exchange.
The high-temperature water tank 10 and the low-temperature water tank 11 are respectively provided with a pressure type liquid level meter, a current signal of 4-20 mA of the liquid level is transmitted to a PLC (programmable logic controller), an output signal is given through a PLC program parameter set value, and the output signal is transmitted to an automatic water replenishing electric regulating valve 16 for water replenishing. The water in the water tank is pumped to the plate heat exchanger 19 through the circulating pump 20 for heat energy replacement, and the residual heat is used for heating tap water, so that the secondary utilization of the heat of the flue gas is realized. Meanwhile, part of the heated water is conveyed to the spraying component 8 through the spraying pipe 15 to carry out spraying heat exchange in the primary heat exchange process.
The deep recovery system for the flue gas waste heat further comprises a dosing device 3, wherein the dosing device 3 is specifically a liquid medicine tank 24, the top of the liquid medicine tank is provided with a stirring pump 25, and a dosing pipeline 22 is connected between the liquid medicine tank 24 and a water tank.
The lower side of the liquid medicine tank 24 is connected with a medicine feeding pump 23 through a medicine feeding pipeline 22, and two branches are arranged at the output port of the medicine feeding pipeline 22 and respectively communicated with the high-temperature water tank 10 and the low-temperature water tank 11.
The water tank chemical adding device 3 transmits the pH value data measured by an invasive pH value sensor (not shown in the figure) arranged in the water tank to the PLC controller in real time, the PLC program controls the setting of the parameters and gives out control signals to start the electric regulating valve 16, the liquid medicine in the liquid medicine tank 24 is pumped to the water tank through the chemical adding pump 23 after being uniformly mixed by the stirring pump 25, and the automatic chemical adding function is completed to balance the pH value of the water.
The deep recovery system for the waste heat of the flue gas can reduce the temperature of the flue gas to 20 ℃ based on secondary heat absorption of primary heat exchange of spray type heat exchange and external circulation heat exchange, and improve the energy utilization rate of the original system by 7-10%; meanwhile, the direct contact type spraying form is utilized, secondary emission reduction of the flue gas can be realized, and the phenomenon of white smoke emission is basically eliminated at last along with the condensation of a large amount of moisture in the flue gas cooling process.
It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. The utility model provides a flue gas waste heat degree of depth recovery system which characterized in that includes: a shell body, a plurality of first connecting rods and a plurality of second connecting rods,
a flue gas channel is arranged in the shell, and a spray assembly for spraying and cooling flue gas is arranged in the flue gas channel;
the bottom of the shell is provided with a water tank for receiving spray water, and the water tank is connected with a circulating heat exchange assembly through a pipeline.
2. The deep recovery system of flue gas waste heat according to claim 1, wherein the spray assembly comprises a high-temperature section spray assembly and a low-temperature section spray assembly, and a flue gas baffle plate is arranged between the high-temperature section spray assembly and the low-temperature section spray assembly.
3. The deep recycling system for flue gas waste heat according to claim 2, wherein a flue gas inlet is arranged on the side of the casing, a flue gas outlet is arranged on the top of the casing, the high-temperature section spraying assembly is arranged on the inner side of the flue gas inlet, and the low-temperature section spraying assembly is arranged on the lower portion of the flue gas outlet.
4. The deep recovery system of waste heat from flue gas of claim 2, wherein a gas-liquid mixing assembly is further disposed between the high-temperature stage spray assembly and the low-temperature stage spray assembly, the gas-liquid mixing assembly comprises a bubble nozzle and a gas-liquid mixing sieve plate, the bubble nozzle is mounted on a side wall of the housing, and the gas-liquid mixing sieve plate is located below the bubble nozzle and disposed in the flue gas channel.
5. The deep recovery system of flue gas waste heat according to claim 4, wherein the flue gas baffle plates comprise two staggered baffles, each baffle is arranged obliquely relative to a horizontal plane, one baffle is connected with the bottom of the gas-liquid mixing sieve plate, and the other baffle is connected above the water tank.
6. The deep recycling system for flue gas waste heat according to claim 4, wherein the water tank comprises a high-temperature water tank and a low-temperature water tank for receiving the spray water of the high-temperature stage spray assembly and the spray water of the low-temperature stage spray assembly, and the circulating heat exchange assembly comprises a circulating pump and a heat exchanger which are respectively arranged corresponding to the high-temperature water tank and the low-temperature water tank.
7. The deep recovery system of flue gas waste heat according to claim 6, wherein a spray pipe is connected between the heat exchanger and the shell, the spray assembly comprises a spray branch pipe connected to the spray pipe and a nozzle installed on the spray branch pipe, and the spray branch pipe is detachably connected with the spray pipe through a flange.
8. The deep recovery system for flue gas waste heat according to claim 7, wherein a gas-liquid mixing branch pipe is connected to the spray pipe, the bubble nozzle is connected to the gas-liquid mixing branch pipe, a plurality of through holes are uniformly distributed on the gas-liquid mixing sieve plate, and the bubble nozzle comprises a butterfly nozzle arranged below the low-temperature section spray assembly.
9. The deep recovery system for flue gas waste heat according to claim 7, wherein the heat exchanger comprises a high-temperature section heat exchanger and a low-temperature section heat exchanger, and the spray pipe comprises a high-temperature section spray pipe and a low-temperature section spray pipe which are respectively connected to the high-temperature section heat exchanger and the low-temperature section heat exchanger;
the heat exchanger is connected with a tap water inlet pipeline and a tap water outlet pipeline, an electric control valve is installed on the tap water inlet pipeline, a temperature sensor is installed on the tap water outlet pipeline, and the electric control valve and the temperature sensor are electrically connected with the control module.
10. The deep recycling system for flue gas waste heat according to claim 9, further comprising a dosing device, wherein a dosing pipeline is connected between the dosing device and the water tank, a pH value sensor is installed in the water tank, and the pH value sensor is electrically connected with the control module.
CN202111338224.XA 2021-11-12 2021-11-12 Flue gas waste heat degree of depth recovery system Pending CN113932244A (en)

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Application Number Priority Date Filing Date Title
CN202111338224.XA CN113932244A (en) 2021-11-12 2021-11-12 Flue gas waste heat degree of depth recovery system

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Application Number Priority Date Filing Date Title
CN202111338224.XA CN113932244A (en) 2021-11-12 2021-11-12 Flue gas waste heat degree of depth recovery system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116850750A (en) * 2023-07-07 2023-10-10 苏州绿仕环保科技有限公司 Organic waste gas treatment method and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116850750A (en) * 2023-07-07 2023-10-10 苏州绿仕环保科技有限公司 Organic waste gas treatment method and device

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