CN112023593A - Multi-product recovery system and method for wet flue gas working medium containing solid particles - Google Patents
Multi-product recovery system and method for wet flue gas working medium containing solid particles Download PDFInfo
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- CN112023593A CN112023593A CN202010960305.2A CN202010960305A CN112023593A CN 112023593 A CN112023593 A CN 112023593A CN 202010960305 A CN202010960305 A CN 202010960305A CN 112023593 A CN112023593 A CN 112023593A
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- 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
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Abstract
The invention provides a multi-product recovery system and method of wet flue gas working media containing solid particles, which comprises an ash removal device for primary ash removal, wherein the working media subjected to the primary ash removal enter a first heat exchange device and a second heat exchange device which are sequentially connected for sectional settlement condensation, and the lower parts of the ash removal device, the first heat exchange device and the second heat exchange device are connected with a separation device for separating and recovering particles and condensate. The multi-product recovery system can be used for recovering wet flue gas of particles, can recover low-grade preheating, can realize separation and recovery of condensate and solid particles, can simultaneously recover various products such as waste heat, water, solid particles and the like, and realizes efficient utilization and emission reduction of the flue gas.
Description
Technical Field
The invention relates to the technical field of wet flue gas recovery, in particular to a multi-product recovery system and method for wet flue gas working media containing solid particles.
Background
The wet flue gas containing particles is widely used in industrial scenes such as power generation system boilers, various industrial furnace types, high-energy-consumption industries of smelting chemical industry and the like, various drying system exhaust gases and the like. The flue gas contains a large amount of heat, moisture and solid particles, and the adoption of a proper heat exchanger can realize the multi-product recovery of the flue gas waste heat, the moisture and the solid particles, thereby obtaining greater effects of energy conservation, water conservation and emission reduction. However, because the latent heat of the water vapor is released in the process of deeply recovering heat, a large amount of condensate is generated. The condensate liquid can lead solid particles to be easy to adhere to, and a large amount of wet deposited dust is easy to accumulate, so that a flow passage is blocked, and the operation of the heat exchanger is influenced. In severe cases, the heat exchanger can become completely plugged. Meanwhile, the sludge-like condensate and the solid particle mixture are not easy to discharge, and the condensate and the particle mixture are difficult to separate and recycle effectively.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a multi-product recovery system and a multi-product recovery method for a wet flue gas working medium containing solid particles, which aim to solve the problems that in the process of deeply recovering heat, a large amount of condensate generated easily adheres to the solid particles, a large amount of wet accumulated dust is easily accumulated to block a flow channel, and a heat exchanger is also blocked under severe conditions, so that the smooth discharge of the condensate and the particulate matters is influenced, and the working medium cannot be effectively recycled.
In order to solve the technical problem, the invention provides a multi-product recovery system of wet flue gas working media containing solid particles, which comprises an ash removal device for preliminary ash removal, wherein the working media subjected to preliminary ash removal enter a first heat exchange device and a second heat exchange device which are sequentially connected for fractional settlement and condensation, and the lower part of the ash removal device, the lower part of the first heat exchange device and the lower part of the second heat exchange device are connected with a separation device for separating and recovering particles and condensate.
The multi-product recovery system greatly improves the heat exchange efficiency through the partition design and the sectional design of the heat exchanger, simultaneously effectively reduces the blocking risk, can smoothly discharge condensate and particulate matters, enables the system to operate efficiently, and effectively separates and recovers the condensate and the particulate matters through the separation device, thereby realizing the efficient utilization of flue gas and reducing the discharge.
Further, the first heat exchange device adopts a double-H-shaped heat exchange tube heat exchanger; the second heat exchange device adopts a spiral tube heat exchanger. Still remain the minor part deposition in the working medium behind the dust arrester, get into two H type heat exchange tube heat exchangers and further condense and subside afterwards, because two H type heat exchange tube heat exchangers have two H type fin structures, the gap in the middle of two fins is favorable to the flow of wet flue gas and the washing away to the deposition, because there is higher velocity of flow in gap department flue gas, the pipe is arranged in the same direction as the row, and the resistance is little, and wearing and tearing are also little, conveniently the ash arrester, so first heat transfer device adopts two H type heat exchange tube heat exchangers that have anti deposition and wearability. The content of particulate matters in the working medium after passing through the double-H-shaped heat exchange tube heat exchanger is very low, the moisture content is reduced, and the heat exchange requirement is reduced, so that the second heat exchange device selects a spiral tube heat exchanger, and the spiral tube heat exchanger has the advantages of high production efficiency, good heat transfer performance, compact structure, simplicity in installation and the like. Through the sectional type heat exchange design, the heat exchange efficiency can be greatly improved, the abrasion of the finned tubes is effectively reduced, and the sludge-like condensate and solid particle mixture can be smoothly discharged to enter a subsequent recycling process.
And a diameter-expanding flue is arranged between the supercharging device and the ash removal device and is used for reducing the flow speed of the working medium after the working medium is supercharged. The cross section area of the expanding flue is changed from small to large, the flow speed of the working medium can be reduced, the abrasion of the working medium to the ash removal device and the heat exchanger is reduced, and the ash removal effect can be improved.
Furthermore, an ash deposition monitoring device is arranged on the expanding flue and used for monitoring the ash deposition amount on the ash removal device; and an ash deposition monitoring device is arranged between the first heat exchange device and the second heat exchange device and is used for monitoring the ash deposition amount contained in the working medium after the working medium is condensed and settled by the first heat exchange device. The dust deposition monitoring device can monitor the dust deposition amount on the dust removing device in real time, and the supercharging device and the dust removing device can be dynamically adjusted in real time according to the dust deposition monitoring device, so that the economic operation of the system is realized.
Furthermore, the dust deposition monitoring device is composed of a polar plate hanging frame, an upper polar plate and a lower polar plate, the upper polar plate is connected with the polar plate hanging frame through a spring, the lower polar plate is connected with the polar plate hanging frame through an insulating rope, and the polar plate hanging frame is connected to the flue through an insulating rod. The influence of the particles on the capacitance between the upper polar plate and the lower polar plate is superposed, so that the capacitance change of the two polar plates can be amplified, the precision is high, the structure is simple, and the rotating-free structure does not depend on other power devices, so that the reliability is high.
Further, separator includes collecting tank and mud holding vessel, the mud holding vessel sets up the below of collecting tank, just mud storage tank open-top. After the bottom of the liquid collecting tank is opened, sludge falls into the sludge storage tank for recycling due to the action of gravity.
Further, a liquid outlet is formed in the side wall of the liquid collecting tank; the bottom of the liquid collecting groove is provided with a movable inclined plate, and the movable inclined plate can rotate towards one side far away from the liquid outlet relative to the top of the liquid collecting groove so as to open the bottom of the liquid collecting groove. The bottom of the liquid collecting tank is set to be an inclined plane, so that condensate and moist solid particles can be smoothly discharged.
Furthermore, the movable inclined plate is provided with a tension sensor, and the tension sensor is connected with an automatic control system. Set up the pulling force change that tension sensor can the perception bottom, when the pulling force surpassed a definite value, automatic control system acted, opened the collecting tank bottom for mud falls into in the sludge storage tank.
Furthermore, the dust removing device comprises a dust blowing device and a dust deposition coarse steel mesh which are sequentially connected, and the dust blowing device is used for blowing the dust on the dust deposition coarse steel mesh into the liquid collecting tank for separation and recovery. Dust on the ash deposition rough steel mesh can be gradually accumulated, and the ash deposition containing a small amount of liquid drops on the ash deposition rough steel mesh is swept into a liquid collecting tank by a soot blowing device at regular time for separation and recovery.
And the spraying device is connected with the second heat exchange device to be used for spraying and cooling the working medium subjected to heat exchange. After the sectional heat exchange, the working medium almost does not contain particles, and can be recycled after being sprayed and cooled.
In addition, the invention also provides a method for recovering the multi-product of the wet flue gas working medium containing the particles, which comprises the following steps:
after primary ash removal, the working medium is subjected to sectional settling condensation to obtain condensate containing particulate matters;
and separating and recovering the condensate containing the particles.
Compared with the prior art, the invention has the beneficial effects that:
the multi-product recovery system greatly improves the heat exchange efficiency through the partition design and the sectional design of the heat exchanger, effectively reduces the blocking risk, smoothly discharges condensate and particulate matters, enables the system to operate efficiently, and effectively separates and recovers the condensate and the particulate matters through the separation device, thereby realizing the efficient utilization and the reduction of the emission of flue gas;
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a multi-product recovery system according to the present invention;
fig. 2 is an enlarged schematic view of the structure of the ash deposition monitor according to the present invention.
Description of reference numerals:
1-a dust removal device; 11-a soot blower;
12-ash deposition coarse steel mesh; 2-a first heat exchange device;
3-a second heat exchange device; 4-a separation device;
41-a liquid collecting tank; 42-sludge storage tank;
401-a liquid outlet; 402-a tension sensor;
5-a supercharging device; 6-expanding the flue;
7-dust deposition monitoring device; 71-pole plate hanging frame;
72-upper pole plate; 73-lower pole plate;
701-a spring; 702-an insulating rope;
703-an insulating rod; 8-spraying device.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-2, the multi-product recycling system of wet flue gas working medium containing solid particles provided by the invention comprises an ash removal device 1 for preliminary ash removal, the working medium subjected to preliminary ash removal enters a first heat exchange device 2 and a second heat exchange device 3 which are sequentially connected to perform fractional settlement condensation, and the lower part of the ash removal device 1, the lower part of the first heat exchange device 2 and the lower part of the second heat exchange device 3 are connected with a separation device 4 for separating and recycling particulate matters and condensate.
Specifically, the device also comprises a supercharging device 5, an expanding flue 6 is arranged between the supercharging device 5 and the ash removal device 1 and used for reducing the flow velocity of the working medium after the working medium is supercharged, the cross section area of the expanding flue 6 is increased from small to large, the flow velocity of the working medium can be reduced, the abrasion of the working medium on the ash removal device 1 and a heat exchanger is reduced, and the ash removal effect can be improved. Preferably, the expanding flue 6 is also provided with an ash deposition monitoring device 7 for monitoring the ash deposition amount on the ash removal device 1, and the supercharging device 5 and the ash removal device 1 can be dynamically adjusted in real time according to the ash deposition monitoring device 7, so that the economic operation of the system is realized. In addition, an ash deposition monitoring device 7 is arranged between the first heat exchange device 2 and the second heat exchange device 3 and used for monitoring the ash deposition amount contained in the working medium after the working medium is condensed and settled by the first heat exchange device 2.
The dust deposition monitoring device 7 is composed of a pole plate hanging frame 71, an upper pole plate 72 and a lower pole plate 73, the upper pole plate 72 is connected with the pole plate hanging frame 71 through a spring 701, the lower pole plate 73 is connected with the pole plate hanging frame 71 through an insulating rope 702, and the pole plate hanging frame 71 is connected to a flue through an insulating rod 703. The influence of the particles on the capacitance between the upper pole plate 72 and the lower pole plate 73 is superposed, so that the capacitance change of the two pole plates can be amplified, the precision is high, the structure is simple, and no rotating structure is adopted, and the reliability is high.
In addition, in the embodiment, the first heat exchange device 2 adopts a double-H-shaped heat exchange tube heat exchanger; the second heat exchange device 3 adopts a spiral tube heat exchanger. Still remain the minor part deposition in the working medium behind dust arrester installation 1, get into two H type heat exchange tube heat exchangers afterwards and carry out further condensation subsides again, because two H type heat exchange tube heat exchangers have two H type fin structures, the gap in the middle of two fins is favorable to the flow of wet flue gas and the washing away to the deposition, because there is higher velocity of flow in gap department flue gas, the pipe is arranged in the same direction as the row, and the resistance is little, and wearing and tearing are also little, the convenient dust arrester, so first heat transfer installation 2 adopts two H type heat exchange tube heat exchangers that have anti deposition and resistance to wear performance. The content of particulate matters in the working medium after passing through the double-H-shaped heat exchange tube heat exchanger is very low, the moisture content is reduced, and the heat exchange requirement is reduced, so that the second heat exchange device 3 is a spiral tube heat exchanger which has the advantages of high production efficiency, good heat transfer performance, compact structure, simple installation and the like. Through the sectional type heat exchange design, the heat exchange efficiency can be greatly improved, the abrasion of the finned tubes is effectively reduced, and the sludge-like condensate and solid particle mixture can be smoothly discharged to enter a subsequent recycling process.
With continued reference to fig. 1, the separation device 4 of the present embodiment includes a liquid collecting tank 41 and a sludge storage tank 42, the top of the sludge storage tank 42 is open and disposed below the liquid collecting tank 41, and after the bottom of the liquid collecting tank 41 is opened, the sludge falls into the sludge storage tank for recycling due to gravity.
Wherein, the side wall of the liquid collecting groove 41 is provided with a liquid outlet 401; the bottom of the liquid collecting groove 41 is provided with a movable inclined plate, the movable inclined plate can rotate towards one side far away from the liquid outlet 401 relative to the top of the liquid collecting groove 41 so as to open the bottom of the liquid collecting groove 41, the bottom of the liquid collecting groove 41 is set to be an inclined plane, and condensate and wet solid particles can be smoothly discharged.
On the basis of the scheme, as preferred, the movable swash plate is provided with the tension sensor 402, the tension sensor 402 is connected with an automatic control system, the tension sensor 402 is arranged to sense the tension change of the bottom, and when the tension exceeds a certain value, the automatic control system acts to open the bottom of the liquid collecting tank 41, so that sludge falls into the sludge storage tank 42.
In this embodiment, the dust removing device 1 includes the soot blower 11 and the coarse steel mesh 12, and the soot blower is used for sweeping the accumulated dust on the coarse steel mesh 12 into the liquid collecting tank 41 for separation and recovery, and the dust on the coarse steel mesh 12 can be gradually accumulated, and the soot blower 11 is used for sweeping the accumulated dust containing a small amount of liquid drops on the coarse steel mesh 12 into the liquid collecting tank 41 for separation and recovery at regular time.
In the above embodiment, the heat exchanger further comprises a spraying device 8, and the spraying device 8 is connected with the second heat exchange device 3 to be used for spraying and cooling the heat-exchanged working medium. After sectional heat exchange, the working medium almost does not contain particles, and can be recycled after being sprayed and cooled.
The working process and principle of the multi-product recovery system containing the solid particle wet flue gas working medium of the invention are briefly explained below.
The working medium enters the expanding flue 6 after being pressurized by the pressurizing device 5, the cross section area of the expanding flue 6 is increased from small to large, the flow velocity of the working medium is reduced, the working medium with the reduced flow velocity enters the dust removing device 1 for preliminary dust removal, the blowing device 11 blows dust accumulated on the dust-deposition coarse steel mesh 12 at regular time, and the dust containing a small amount of liquid drops is blown into the liquid collecting tank 41 for separation and recovery. The working medium after preliminary dust removal also contains a small part of particles, the particles enter the first heat exchange device 2 for settlement and condensation, then enter the second heat exchange device 3 for further condensation, and the condensate containing the particles enters the separation device 4 for separation of the particles and the condensate.
The multi-product recovery system containing the solid particle wet flue gas working medium greatly improves the heat exchange efficiency through the partition design and the sectional design of the heat exchanger, effectively reduces the blocking risk, smoothly discharges condensate and particles, enables the system to operate efficiently, and effectively separates and recovers the condensate and the particles through the separation device, thereby realizing the efficient utilization and the reduction of the emission of the flue gas;
finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a many products recovery system that contains wet flue gas working medium of solid particle which characterized in that, is including the ash handling equipment who is used for preliminary ash handling, and the working medium after preliminary ash handling gets into the first heat transfer device and the second heat transfer device that connect gradually in order to carry out the segmentation and subside the condensation, ash handling equipment's lower part, first heat transfer device's lower part and second heat transfer device's lower part all are connected with separator and are used for separating particulate matter and condensate and retrieve.
2. The multi-product recovery system of claim 1, wherein the first heat exchange means employs a double H-type heat exchange tube heat exchanger; the second heat exchange device adopts a spiral tube heat exchanger.
3. The multi-product recovery system of claim 1, further comprising a pressurizing device, wherein an expanded diameter flue is arranged between the pressurizing device and the ash removal device for reducing the flow rate of the pressurized working medium.
4. The multi-product recovery system of claim 3, wherein the expanded diameter flue is provided with an ash deposition monitoring device for monitoring the ash deposition amount on the ash removal device; and an ash deposition monitoring device is arranged between the first heat exchange device and the second heat exchange device and is used for monitoring the ash deposition amount contained in the working medium after the working medium is condensed and settled by the first heat exchange device.
5. The multi-product recovery system of claim 4, wherein the ash deposition monitoring device comprises a plate hanger frame, an upper plate and a lower plate, the upper plate and the plate hanger frame are connected by a spring, the lower plate and the plate hanger frame are connected by an insulating rope, and the plate hanger frame is connected to the flue by an insulating rod.
6. The multi-product recovery system of claim 1, wherein the separation device comprises a sump and a sludge storage tank, the sludge storage tank is disposed below the sump, and the sludge storage tank is open at a top.
7. The multi-product recovery system of claim 6 wherein the sump side wall is provided with a liquid outlet; the bottom of the liquid collecting groove is provided with a movable inclined plate, and the movable inclined plate can rotate towards one side far away from the liquid outlet relative to the top of the liquid collecting groove so as to open the bottom of the liquid collecting groove.
8. The multi-product recovery system of claim 7, wherein the movable tilt plate is provided with a tension sensor connected to an automatic control system.
9. The multi-product recovery system of claim 6, wherein the ash removing device comprises a soot blower and a coarse ash-depositing steel net which are connected in sequence, and the soot blower is used for blowing the ash on the coarse ash-depositing steel net into a liquid collecting tank for separation and recovery.
10. A method for multi-product recovery of wet flue gas working medium containing solid particles by using the recovery system of any one of claims 1 to 10, which is characterized by comprising the following steps:
after primary ash removal, the working medium is subjected to sectional settling condensation to obtain condensate containing particulate matters;
and separating and recovering the condensate containing the particles.
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| CN202010960305.2A CN112023593A (en) | 2020-09-14 | 2020-09-14 | Multi-product recovery system and method for wet flue gas working medium containing solid particles |
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| CN202010960305.2A CN112023593A (en) | 2020-09-14 | 2020-09-14 | Multi-product recovery system and method for wet flue gas working medium containing solid particles |
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Application publication date: 20201204 |