CN210097370U - Absorption liquid injection system and flue gas purification system using same - Google Patents
Absorption liquid injection system and flue gas purification system using same Download PDFInfo
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- CN210097370U CN210097370U CN201920260905.0U CN201920260905U CN210097370U CN 210097370 U CN210097370 U CN 210097370U CN 201920260905 U CN201920260905 U CN 201920260905U CN 210097370 U CN210097370 U CN 210097370U
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Abstract
The utility model discloses an absorption liquid spouting system and use its gas cleaning system solves the absorption of the absorption target object that treats that promotes absorption liquid to contain in the air current. The absorption liquid injection system includes: an air flow transport passage for transporting an air flow containing an object to be absorbed; the absorption liquid injection device is used for injecting absorption liquid for absorbing the target object to be absorbed into the airflow conveying channel, and the characteristic that the target object to be absorbed is absorbed by the absorption liquid belongs to a heat release process on the whole; the airflow conveying channel is provided with a channel expansion part; the nozzle of the absorbing liquid injection device is positioned in front of the channel expansion part and close to the inlet of the channel expansion part. Since the airflow absorbs heat due to volume expansion when immediately entering the passage expansion part, the volume expansion of the airflow after entering the passage expansion part can promote the target object to be absorbed in the airflow to be more fully absorbed by the absorption liquid.
Description
Technical Field
The utility model relates to a flue gas purification technical field particularly, relates to absorption liquid spouting system and use its flue gas purification system and flue gas purification method. Furthermore, the utility model discloses still relate to an air current heat transfer tower.
Background
In a typical Blast Furnace Gas purification and TRT (Blast Furnace Top Gas recovery turbine Unit, generally called a Blast Furnace Gas excess pressure turbine generator set) power generation process system, Blast Furnace Gas firstly enters a flue Gas dust removal system for dust removal and purification (the Blast Furnace Gas after dust removal and purification is generally called clean Gas), then enters a TRT power generation device for power generation, then enters a clean Gas conveying system, and finally is distributed to subsequent relevant users as required. The clean gas often contains certain amounts of HCl and SOxAnd the condensed gas can corrode and block pipelines, therefore, a dechlorinating device is designed behind a TRT power generation device, the dechlorinating device is actually a spray tower, the lower part of the spray tower is provided with an air inlet, the upper part of the spray tower is provided with a spraying facility, spraying liquid adopts alkali liquor such as NaOH, when the spray tower runs, clean gas enters the spray tower from the air inlet at the lower part of the spray tower and moves from bottom to top, the clean gas is contacted with the spraying liquid sprayed by the spraying facility in the process, and the spraying liquid dissolves and neutralizes HCl while cooling the clean gas, SO that the aim of absorbing HCl and SO is fulfilledxThe dechlorinated clean gas is discharged from the spray tower.
Devices similar to the above dechlorination devices (which may be collectively referred to as absorption liquid spray devices) are also commonly used in the field of flue gas purification such as flue gas desulfurization. However, in general, the technical problems of such devices are mainly: the removal effect on the target to be absorbed contained in the air flow is not good; the consumption of the absorption liquid is large, and the use cost is high; the tail gas output by the spray tower needs to be heated and whitened by special heating equipment before being discharged, so that the energy consumption is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an absorption liquid spouting system and a flue gas purification method using the same are provided, which solve the technical problem of promoting the absorption of absorption liquid to a target object to be absorbed contained in the air current. The utility model discloses the technical problem that still need solve provides an air current heat transfer tower, solves the technical problem that reduces the energy consumption that heats to the air current.
In order to solve the above technical problem, according to an aspect of the present invention, there is provided an absorbent injection system. The absorption liquid injection system includes: an air flow transport passage for transporting an air flow containing an object to be absorbed; the absorption liquid injection device is used for injecting absorption liquid for absorbing the target object to be absorbed into the airflow conveying channel, and the characteristic that the target object to be absorbed is absorbed by the absorption liquid belongs to a heat release process on the whole; the airflow conveying channel is provided with a channel expansion part; the nozzle of the absorbing liquid injection device is positioned in front of the channel expansion part and close to the inlet of the channel expansion part.
Further, the absorption liquid injection device is an absorption liquid injection device which causes the absorption liquid to act on the air flow in the form of mist.
Further, the absorption liquid injection device uses a downstream jet, and the direction of the downstream jet is consistent with the direction of an airflow conveying channel where the downstream jet is located.
Furthermore, the absorption liquid injection device comprises a plurality of injection units which are uniformly distributed along the periphery of one cross section of the airflow conveying channel, and each injection unit is provided with a corresponding nozzle.
Further, at least one of the plurality of injection units is provided with a working part with a nozzle which can be extracted and inserted into the airflow conveying channel.
Further, the target to be absorbed is an acidic substance; the absorption liquid is water or alkali liquor. Further, the target to be absorbed is mainly HCl and/or SOx(ii) a The absorption liquid is water or NaOH water solution.
Further, the absorption liquid supply source connected to the absorption liquid injection device includes: a first supply flow path for supplying water to the absorbent injector, the first supply flow path including a first power unit for supplying power to the first supply flow path and a first supply amount controller for adjusting a supply amount of the first supply flow path; a second supply flow path for supplying the absorbing liquid injection device with an alkali liquid, and having a second power device for powering the second supply flow path and a second supply amount control device for adjusting the supply amount of the second supply flow path; and a third supply flow path for joining the output end of the first supply flow path and the output end of the second supply flow path and connecting the third supply flow path to the absorbent injecting device.
Further, the first supply amount control device is a control device that adjusts the supply amount of the first supply flow path by the temperature of the air flow passing through the absorbent injection system.
Further, the second supply amount control device is a control device for adjusting the supply amount of the second supply flow path by the pH of the absorbent after use in the absorbent injection system.
Further, the air flow conveying channel comprises a tower body used for conveying ascending air flow and an air inlet pipe located on the side wall of the tower body, a position in the tower body communicated with the air inlet pipe forms a channel expansion portion relative to the air inlet pipe, a nozzle of the absorption liquid injection device is located in the air inlet pipe and close to a connection position between the air inlet pipe and the tower body, and a liquid storage structure is arranged below the channel expansion portion.
Further, the centre line of the inlet duct is offset from the centre line of the tower so that the updraft entering the tower from the inlet duct is caused to perform a partial motion rotating about the centre line of the tower.
Further, a spraying device used for acting on ascending air flow is arranged in the tower body, and the spraying device uses spraying liquid capable of absorbing residual target objects to be absorbed and/or cooling the air flow.
Further, a gas-liquid separation device for performing gas-liquid separation on the ascending gas flow to be output from the tower body in the tower body is arranged in the tower body.
Further, the gas-liquid separation equipment comprises a rotational flow type separation unit group, the rotational flow type separation unit group comprises a plurality of rotational flow type separation units distributed on an ascending airflow main channel of the tower body, the rotational flow type separation units divide the ascending airflow main channel into a certain number of airflow sub-channels, each rotational flow type separation unit comprises a cylinder body used for forming the corresponding airflow sub-channel and a rotational flow guide disc arranged in the cylinder body, and the rotational flow guide disc is provided with a core part and rotational flow guide blades arranged on the core part and arranged around the core part at intervals.
Further, the tower body includes: a tower body lower portion air flow processing portion for processing an air flow to be processed containing a target object to be absorbed by an air flow processing member to output a heated air flow converted from the air flow to be processed to an upper portion of the tower body, the air flow processing member including an absorption liquid injection device and a passage enlarging portion; the tower body upper part air flow heat exchange part is used for heating the air flow to be heated output by the tower body lower part air flow processing part by using the air flow to be cooled containing the target object to be absorbed as a heat medium flow so as to output the heated air flow converted from the air flow to be heated; and the upper airflow heat exchange part and the lower airflow guide part of the tower body output the cooled airflow which is converted from the airflow to be cooled after heat exchange through the airflow conveying part and serve as the airflow to be treated containing the target object to be absorbed and input the airflow to be treated into the lower airflow treatment part of the tower body through the air inlet pipe.
Further, the heat exchange part comprises heat exchange tubes, the inner parts of the heat exchange tubes form a flow path of the heating medium, and gaps among the heat exchange tubes form a heating channel for allowing the air flow to be heated output by the air flow treatment part at the lower part of the tower body to pass through and be heated.
Furthermore, the air delivery part comprises an air delivery pipe arranged on the side surface of the tower body, the upper end of the air delivery pipe is connected with a corresponding port of the air heat exchange part on the upper part of the tower body, and the lower end of the air delivery pipe forms an air inlet pipe.
In order to solve the above technical problem, according to the utility model discloses an aspect provides a flue gas purification system. A flue gas purification system comprising: the flue gas dedusting system comprises a flue gas input channel to be dedusted, a flue gas deduster and a dedusted flue gas output channel, wherein the flue gas input channel to be dedusted is connected with a flue gas generating source, and the flue gas generating source comprises but is not limited to an industrial kiln; and the absorption liquid injection system adopts any one of the absorption liquid injection systems, wherein the airflow conveying channel of the absorption liquid injection system is connected with the dedusted flue gas output channel of the flue gas dedusting system.
In order to solve the above technical problem, according to an aspect of the present invention, a method for purifying flue gas is provided. The flue gas purification method comprises the steps of purifying flue gas by using the flue gas purification system; wherein, the flue gas that the flue gas generating source discharged carries out the primary purification through flue gas dust pelletizing system earlier, and rethread absorption liquid spouts the system and carries out the secondary purification.
Further, the flue gas generating source is a blast furnace, and the flue gas discharged by the flue gas generating source is blast furnace gas; and the blast furnace gas after primary purification passes through a TRT power generation device and then is subjected to secondary purification, and the blast furnace gas after secondary purification enters a clean gas conveying system.
The utility model discloses an above-mentioned absorption liquid injection system, flue gas purification system and flue gas purification method, through the spout that spouts the absorption liquid injection device of absorption liquid injection system set up in the place ahead of passageway expansion portion and be close to the entry of this passageway expansion portion, absorption liquid injection device spun absorption liquid can be at first fast comprehensive act on in the air current, because the air current absorbs heat because of the volume expansion when entering the passageway expansion portion immediately, and this characteristic that the target object of waiting to absorb in the air current is absorbed by the absorption liquid belongs to exothermic process again on the whole, so the air current volume expansion can promote the target object of waiting to absorb in the air current to be more abundant absorption by the absorption liquid after entering the passageway expansion portion, and, the air current volume expansion when entering the passageway expansion portion, speed reduction, be favorable to further dispersion of absorption liquid and wait to absorb more abundant contact of target object, promoting the absorption of the object to be absorbed by the absorption liquid.
In order to solve the above technical problem, according to the utility model discloses an aspect provides an air current heat exchange tower. A gas stream heat exchange column comprising: the tower body lower part air flow processing part is used for processing the air flow to be processed through the air flow processing part so as to output the air flow to be heated converted from the air flow to be processed to the upper part of the tower body; the tower body upper part air flow heat exchange part is used for heating the air flow to be heated output by the tower body lower part air flow processing part through a heat exchange part taking the air flow to be cooled as a heating medium flow so as to output heated air flow converted from the air flow to be heated; and the upper airflow guide part and the lower airflow guide part of the tower body are used for inputting the cooled airflow which is output by the upper airflow heat exchange part of the tower body and is converted after the heat exchange of the airflow to be cooled and is used as the airflow to be processed into the lower airflow processing part of the tower body through the airflow conveying part.
Further, the gas flow treatment member includes an absorption liquid injection device for injecting an absorption liquid into a gas flow to be treated containing a target to be absorbed to absorb the target to be absorbed.
Further, the target to be absorbed is an acidic substance; the absorption liquid is water or alkali liquor. Further, the target to be absorbed is mainly HCl and/or SOx(ii) a The absorption liquid is water or NaOH water solution.
Further, the absorption liquid injection device is an absorption liquid injection device which enables absorption liquid to act on the gas flow to be treated in a fog drop mode.
The gas-liquid separation equipment comprises a cyclone separation unit group, wherein the cyclone separation unit group comprises a plurality of cyclone separation units distributed on an ascending airflow main channel of the tower body, and the cyclone separation units subdivide the ascending airflow main channel into a certain number of airflow sub-channels; the cyclone type separation unit comprises a cylinder body and a cyclone guide disc, wherein the cylinder body is used for forming corresponding airflow sub-channels, the cyclone guide disc is arranged in the cylinder body, and the cyclone guide disc is provided with a core part and cyclone guide blades which are arranged on the core part and are arranged around the core part at intervals.
Further, the heat exchange part comprises heat exchange tubes, the inner parts of the heat exchange tubes form a flow path of the heating medium, and gaps among the heat exchange tubes form a heating channel for allowing the air flow to be heated output by the air flow treatment part at the lower part of the tower body to pass through and be heated.
Furthermore, the air delivery part comprises an air delivery pipe arranged on the side surface of the tower body, the upper end of the air delivery pipe is connected with a corresponding port of the air heat exchange part on the upper part of the tower body, and the lower end of the air delivery pipe is connected with a corresponding port of the air treatment part on the lower part of the tower body.
The utility model discloses above-mentioned air current heat transfer tower moves, according to the air current direction of motion, the air current through this air current heat transfer tower is in proper order as waiting to cool down the air current, cooled down the air current, pending air current, waiting to heat the air current and heated the air current, utilizes the air current of waiting to cool down promptly and waits to heat the temperature difference between the air current and realize the heat exchange, cancels or has reduced follow-up energy consumption that heats to heated the air current again.
The present invention will be further described with reference to the accompanying drawings and the detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part of the disclosure, are included to assist in understanding the disclosure, and the description provided herein and the accompanying drawings, which are related thereto, are intended to explain the disclosure, but do not constitute an undue limitation on the disclosure. In the drawings:
fig. 1 is a schematic structural view of an embodiment of the absorption liquid injection system of the present invention.
Fig. 2 is a schematic structural view of an embodiment of the absorption liquid injection device of the absorption liquid injection system of the present invention.
Fig. 3 is a schematic structural view of an embodiment of an absorption liquid supply source of the absorption liquid injection system of the present invention.
Fig. 4 is a schematic structural diagram of an embodiment of the absorption liquid injection system (also referred to as an air flow heat exchange tower) according to the present invention.
Fig. 5 is a schematic diagram of an embodiment of the flue gas purification system of the present invention.
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before the present invention is described with reference to the accompanying drawings, it is to be noted that:
in the present invention, the technical solutions and the technical features provided in each part including the following description can be combined with each other without conflict.
Furthermore, the embodiments of the present invention mentioned in the following description are generally only a partial embodiment of the present invention, and not all embodiments, therefore, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention based on the embodiments of the present invention.
With respect to the terms and units of the present invention: the terms "comprising," "including," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions. In addition, other related terms and units in the present invention can be reasonably explained based on the related content of the present invention.
Fig. 1 is a schematic structural diagram of an embodiment of an absorption liquid injection system 100 according to the present invention. As shown in fig. 1, the absorbent injection system 100 includes an air flow transport channel 110 and an absorbent injection device 120.
Wherein the airflow transport channel 110 is used for transporting the airflow 200 containing the target object to be absorbed, and the airflow transport channel 110 has a channel expansion part 111. By "channel enlargement" is generally understood a space in which the radial dimension (e.g., diameter, width) of the channel increases in the transport path of the airflow delivery channel.
The absorbent injecting means 120 is, as the name implies, a means capable of injecting an absorbent for absorbing an object to be absorbed contained in an air stream, outward, and an outlet of the absorbent injecting means 120 is located in front of the passage enlarging portion 111 and near an entrance of the passage enlarging portion 111.
In addition, the following conditions between the absorption liquid and the object to be absorbed need to be satisfied, namely: this property of the absorption object by the absorption liquid is entirely an exothermic process.
For example, when Cl is present-Is the target to be absorbed, water is the absorption liquid, Cl-Dissolution in water is an exothermic process overall; as another example, when SO3Is the target to be absorbed, water is the absorption liquid, SO3The reaction with water to form sulfuric acid is an overall exothermic process; when another example is SO2Is the target to be absorbed, NaOH aqueous solution is the absorption liquid, SO2The process of dissolving in water and generating sulfurous acid is an exothermic process, and the sulfurous acid and NaOH are neutralized to generate sodium sulfite and water, namely SO2The absorption by aqueous NaOH is overall an exothermic process. Of course, the above-described scenarios are merely examples and do not cover all scenarios.
Since the outlet of the absorbent injection means 120 is disposed in front of the passage-enlarging portion 111 instead of in the passage-enlarging portion 111, the absorbent injected from the absorbent injection means 120 can rapidly and completely act on the airflow 200.
The outlet of the absorbent injection device 120 is close to the inlet of the channel-enlarging portion 111, the injected absorbent will enter the channel-enlarging portion 111 rapidly along with the airflow 200, and since the airflow 200 will expand in volume to absorb heat when entering the channel-enlarging portion 111, and the characteristic that the object to be absorbed in the airflow 200 is absorbed by the absorbent is a heat-releasing process as a whole, the volume expansion of the airflow 200 entering the channel-enlarging portion 111 can promote the object to be absorbed in the airflow 200 to be absorbed more fully by the absorbent.
In addition, when the airflow 200 enters the channel expansion part 111, the volume is expanded and the speed is reduced, which is beneficial to further dispersion of the absorption liquid and more sufficient contact between the absorption liquid and the object to be absorbed, and promotes the object to be absorbed by the absorption liquid.
As shown in fig. 1, in an embodiment of the absorption liquid injection system 100 of the present invention, the air transportation channel 110 includes a tower 112 for transporting the ascending air current and an air inlet pipe 113 located on a side wall of the tower 112, a portion of the tower 112 communicating with the air inlet pipe 113 forms the channel expansion portion 111 corresponding to the air inlet pipe 113, the nozzle of the absorption liquid injection device 120 is located in the air inlet pipe 113 and near a connection between the air inlet pipe 113 and the tower 112, and a liquid storage structure 130 is located below the channel expansion portion 111.
As an optimization of the relationship between the air inlet pipe 113 and the tower 112, the center line of the air inlet pipe 113 is perpendicular to but not intersecting with the center line of the tower 112, so that the center line of the air inlet pipe 113 is actually deviated from the center line of the tower 112 and the ascending air flow entering the tower from the air inlet pipe 113 generates partial motion rotating around the center line of the tower 112, thereby increasing the staying time of the air flow in the passage enlarging portion 111, and further dispersing the absorption liquid by using the rotating centrifugal force, thereby promoting the object to be absorbed to be more fully absorbed by the absorption liquid.
As an optimization of the structure in the tower body 112, as shown in fig. 1, a spraying device 140 for acting on the ascending air flow is arranged in the tower body 112, and the spraying device 140 may use a spraying liquid capable of absorbing the residual target object to be absorbed and/or cooling the air flow. The remaining target object to be absorbed may be the same substance as the target object to be absorbed or a substance different from the target object to be absorbed. The spray liquid can be determined according to the residual target object to be absorbed or the spray cooling requirement.
The utility model discloses an in the obvious not only application scene of absorption liquid injection system 100, treat that the absorption target object is HCl, the absorption liquid is NaOH aqueous solution, spray liquid is water, when the system operation, the air current that contains HCl accesss to tower body 112 through intake pipe 113, before just entering passageway expansion part 111, absorption liquid injection device 120 injects NaOH aqueous solution into the air current, NaOH aqueous solution gets into tower body 112 with the air current that contains HCl together when absorbing HCl immediately, in the updraft in tower body 112, HCl further dissolves in aquatic and takes place neutralization reaction with NaOH, and spray device 140 does not spray water in succession, but detects when updraft temperature surpasss and sets for the threshold value when the system just starts the water spray, consequently, spray device 140 is the equipment of an emergent cooling in fact.
As another optimization of the structure in the tower body 112, as shown in fig. 1, a gas-liquid separation device 150 for performing gas-liquid separation on the ascending gas flow to be output from the tower body 112 in the tower body 112 is provided in the tower body 112. It will be appreciated that the gas-liquid separation device 150 is capable of removing liquid from the gas stream for subsequent processing.
After the gas-liquid separation device 150 is installed, the humidity of the gas flow entering the subsequent pipeline of the tower body 112 is reduced, and HCl and SO are addedxThe acidic substances (when the acidic substances are taken as the target substances to be absorbed) are removed from the airflow as much as possible, so that the problems of pipeline corrosion and the like can be greatly reduced.
The gas-liquid separation apparatus 150 preferably employs the following gas-liquid separation apparatuses: the cyclone type separation unit group comprises a plurality of cyclone type separation units distributed on an ascending air flow main channel of a tower body 112, the cyclone type separation units subdivide the ascending air flow main channel into a certain number of air flow sub-channels, each cyclone type separation unit comprises a cylinder body used for forming the corresponding air flow sub-channel and a cyclone guide disc arranged in the cylinder body, and each cyclone guide disc is provided with a core part and cyclone guide blades arranged on the core part and distributed around the core part at intervals.
The above-mentioned gas-liquid separation apparatus is disclosed in patent application (hereinafter referred to as CN108479201A) with publication number CN108479201A and name "apparatus for separating liquid phase and/or solid phase from gas phase", which was previously filed by the applicant of the present invention, and therefore, the detailed structure and operation principle of the gas-liquid separation apparatus will not be described in the present invention. However, it should be noted that the present invention preferably provides a gas-liquid separation apparatus improved from the above-described gas-liquid separation apparatus disclosed in CN 108479201A.
As shown in fig. 1, the liquid storage structure 130 is used for storing the absorption liquid used by the absorption liquid injection system 100 and the spraying liquid used by the spraying device 140 (if any). The liquid storage structure 130 may generally be formed by the tower bottom and lower shell of the tower 112 and may be provided with a liquid drainage structure. If necessary, the liquid storage structure 130 and the spraying device 140 can be connected through a circulation pipeline assembly, so that the spraying liquid can be recycled.
Preferably, a liquid level control mechanism 160 is disposed at the liquid storage structure 130 to ensure that the liquid level at the lower portion of the tower body 112 is relatively stable, so as to reduce the influence of the liquid level change at the lower portion of the tower body 112 on the air inlet pipe 113 and the air pressure in the tower body 112.
As shown in FIG. 1, the level control mechanism 160 preferably employs the following level control mechanisms: the liquid level control device comprises an overflow groove 162 and a communication pipe 161 connected between the liquid storage structure 130 and the overflow groove 162, wherein a communicating vessel with the same liquid level is formed between the overflow groove 162 and the liquid storage structure 130, so that when the liquid levels in the overflow groove 162 and the liquid storage structure 130 reach the overflow liquid level of the overflow groove 162, the liquid levels in the overflow groove 162 and the liquid storage structure 130 reach a stable state.
The communicating pipe 161 is preferably an inclined pipe, and one end of the communicating pipe connected to the liquid storage structure 130 is lower than one end of the communicating pipe connected to the overflow trough 162, so that when the liquid levels in the overflow trough 162 and the liquid storage structure 130 are stable, a water seal is still formed at the lower end of the communicating pipe 161 (as shown in fig. 1), which plays a role in preventing gas leakage in the tower body 112, thereby simplifying measures for preventing gas flow in the tower body 112 from leaking.
Fig. 2 is a schematic structural view of an embodiment of the absorption liquid injection device of the absorption liquid injection system of the present invention. As shown in fig. 1 to 2, in an embodiment of the absorbent solution injector 120 of the absorbent solution injection system 100 of the present invention, the absorbent solution injector 120 includes a plurality of injector units 121 uniformly distributed along a periphery of a cross section of the air transportation channel 110, each injector unit 121 having a corresponding nozzle; moreover, these injection units 121 each employ an atomizing head (commercially available) so that the absorbing liquid acts on the air stream in the form of mist droplets; in addition, the nozzles of the atomizing nozzles of the injection units 121 are all downstream nozzles, and the direction of the downstream nozzles is consistent with the direction of the airflow conveying channel 110 where the downstream nozzles are located; finally, the working parts of the injector units 121 on which the atomizing heads are mounted are inserted into the air flow duct 110 in a removable manner.
Since the absorbing liquid jetting device 120 includes a plurality of jetting units 121 uniformly distributed along the periphery of a cross section of the air flow conveying channel 110, and each jetting unit 121 has a corresponding jet, the absorbing liquid jetted from the absorbing liquid jetting device 120 can be more rapidly distributed on the whole cross section.
The atomizing nozzle can enable the absorption liquid to act on the air flow in the form of fog drops, so that the consumption of the absorption liquid is saved, the absorption liquid can be fully dispersed in the air flow in the form of fog drops with small particle sizes (preferably, the atomizing nozzle with the particle sizes mainly distributed between 10 and 500 micrometers), and the contact area between the absorption liquid and the air flow is increased.
The combination of the structure of the multiple injection units 121 and the injection manner of the atomizer creates more favorable conditions for the target object to be absorbed to be fully absorbed by the absorption liquid.
The airflow nozzle adopted by the scheme can reduce the resistance of the absorption liquid sprayed by the absorption liquid spraying device 120 to the airflow, reduce the pipeline pressure fluctuation in the system operation process, and improve the accuracy of automatic control on the whole system. Particularly, when the structure of the multiple injection units 121 is adopted, so that the absorption liquid can be distributed on the whole cross section more quickly, the adoption of the downstream nozzles can effectively avoid air embolism caused by accumulation of the absorption liquid on the cross section.
For the means that the working parts of the injection units 121 are inserted into the airflow transport channel 110 in an extractable manner in the above scheme, when the relevant injection unit 121 is subjected to continuous action of hot airflow in the airflow transport channel 110, so that the absorption liquid is evaporated and scaled on the injection unit 121 to cause a blockage problem, the blockage part on the injection unit 121 can be conveniently repaired and replaced.
Fig. 3 is a schematic structural view of an embodiment of an absorption liquid supply source of the absorption liquid injection system of the present invention. As shown in fig. 3, in an embodiment of the absorbent supply source 170 of the absorbent injection system 100 of the present invention, the absorbent supply source 170 connected to the absorbent injection device 120 includes a first supply flow path 171, a second supply flow path 172, and a third supply flow path 173.
The first supply channel 171 is used to supply water to the absorbent injector 120, and includes a first power unit for powering the first supply channel 171 and a first supply amount control unit for adjusting the supply amount of the first supply channel 171. Specifically, the first power unit preferably employs a centrifugal pump 171A (of a backup design in fig. 3), and the actuator of the first supply amount control device preferably includes a flow control mechanism, specifically a flow meter 171B and associated flow control valves.
The first supply amount control means is also preferably a control means that adjusts the supply amount of the first supply flow path by the temperature of the air flow passing through the absorbent injection system 100. In this case, a temperature sensor may be installed at a suitable position of the absorption liquid injection system 100 (for example, on the air flow output channel at the top of the tower body 112 in fig. 1), and the flow rate of the first supply flow path 171 may be controlled by a detection signal of the temperature sensor. Generally, the flow rate of the first supply flow path 171 is increased when the temperature sensor detects that the temperature of the airflow exceeds a set certain threshold, and the flow rate of the first supply flow path 171 is decreased when the temperature sensor detects that the temperature of the airflow is below the set certain threshold.
The second supply flow path 172 is used for supplying the alkali solution to the absorbing solution injector 120, and includes a second power unit for supplying power to the second supply flow path 172 and a second supply amount control unit for adjusting the supply amount of the second supply flow path 172. Specifically, the second power unit preferably employs a metering pump 172A (also configured to be used in fig. 3) that also serves as an actuator of the second supply amount control unit. In addition, a relief valve 172B may be provided in the second supply flow path 172 in parallel with the metering pump 172A to enhance the safety of the second supply flow path 172.
The second supply amount control device is also preferably a control device for adjusting the supply amount of the second supply flow path by the pH of the absorbent after use in the absorbent injection system 100. At this time, a pH sensor may be installed at a suitable position (for example, in the reservoir structure 130 or the overflow tank 162 in fig. 1) of the absorption liquid injection system 100, and the operating frequency of the metering pump 172A may be controlled according to a detection signal of the pH sensor. Generally, the operating frequency of the metering pump 172A is increased when the pH sensor detects that the pH of the used absorbent liquid is below a set threshold, and the operating frequency of the metering pump 172A is decreased when the pH sensor detects that the pH of the used absorbent liquid is above a set threshold.
The third supply channel 173 is used to connect the output end of the first supply channel 171 and the output end of the second supply channel 172 to the absorbent injector 120. Specifically, the third supply channel 173 includes an absorbent supply manifold connected to the output end of the first supply channel 171 and the output end of the second supply channel 172, respectively.
The absorption liquid supply source 170 can independently supply water and alkali solution and control the supply amount respectively, thereby enhancing the control flexibility of the absorption liquid injection system 100. In addition, the absorption liquid supply source 170 can simultaneously adjust the temperature of the air flow passing through the absorption liquid injection system 100 and the pH of the absorption liquid used by the absorption liquid injection system 100 in an optimized manner, which is beneficial to saving the consumption of the absorption liquid and improving the use efficiency of the absorption liquid.
Of course, the above-mentioned embodiment of the absorption liquid supply source 170 is directed to the case where the absorption liquid is water or alkali solution, but does not mean that the absorption liquid supply source 170 can only be used for supplying water or alkali solution.
Fig. 4 is a schematic structural diagram of another embodiment of the absorption liquid injection system (which is also an airflow heat exchange tower) according to the present invention. As shown in fig. 4, the airflow transport channel 110 of the absorption liquid injection system 100 includes a tower 112 for transporting an ascending airflow and an air inlet pipe 113 located on a side wall of the tower 112, a channel expansion portion 111 corresponding to the air inlet pipe 113 is formed in a portion of the tower 112 that communicates with the air inlet pipe 113, an injection port of the absorption liquid injection device 120 is located in the air inlet pipe 113 and near a connection between the air inlet pipe 113 and the tower 112, and a liquid storage structure 130 is located below the channel expansion portion 111; the tower body 112 includes a tower lower airflow processing portion 112A, a tower upper airflow heat exchanging portion 112B, and a tower upper and lower airflow guiding portion 112C.
The tower body lower airflow processing part 112A processes the airflow to be processed 203 containing the target object to be absorbed through an airflow processing component, which includes the absorbing liquid injection device 120 and the passage enlarging part 111, so as to output the airflow to be heated 204 converted from the airflow to be processed 201 to the upper part of the tower body 112.
The tower upper-portion gas flow heat exchanging portion 112B heats the gas flow to be heated 204 output from the tower lower-portion gas flow processing portion 112A by a heat exchanging member using the gas flow to be cooled 201 containing the target object to be absorbed as a heating medium flow, thereby outputting a heated gas flow 205 converted from the gas flow to be heated 204.
The tower upper and lower airflow guiding part 112C outputs the cooled airflow 202, which is converted from the airflow 201 to be cooled after heat exchange, from the tower upper airflow heat exchanging part 112B through the airflow conveying part, as the airflow 203 to be treated containing the target object to be absorbed, and inputs the airflow to be treated into the tower lower airflow treating part 112A through the air inlet pipe 113.
The heat exchange component preferably adopts the following structure: i.e. comprising heat exchange tubes, the interiors of which constitute flow paths for the heating medium, the gaps between the heat exchange tubes constituting heating channels through which the gas stream 204 to be heated output from the tower lower gas stream treatment section 112A is passed and heated.
The air flow conveying component preferably adopts the following structure: that is, the air flow duct is disposed at the side of the tower body 112, the upper end of the air flow duct is connected to the corresponding port of the air flow heat exchanging portion 112B at the upper portion of the tower body, and the lower end of the air flow duct forms an air inlet pipe 113.
In addition, the gas flow treatment part may further include the above-described shower device 140 and/or the gas-liquid separation apparatus 150 in the tower lower gas flow treatment part 112A. Obviously, when the above-described spray device 140 and the gas-liquid separation apparatus 150 are provided in the tower lower gas flow processing section 112A, the gas-liquid separation apparatus 150 should be located above the spray device 140.
When the absorption liquid injection system 100 (also referred to as an air flow heat exchange tower) operates, according to the moving direction of the air flow, the air flow passing through the air flow heat exchange tower is sequentially used as the air flow 201 to be cooled, the cooled air flow 202, the air flow 203 to be processed, the air flow 204 to be heated, and the heated air flow 205, that is, the heat exchange is realized by using the temperature difference between the air flow 201 to be cooled and the air flow 204 to be heated, so that the temperature of the heated air flow 205 is increased, and the energy consumption of subsequently heating the heated air flow 205 (for example, heating and whitening before being discharged to the atmosphere) is cancelled or reduced.
The present invention will be further described with reference to a flue gas purification system and a flue gas purification method to which the absorption liquid injection system of the present invention is applied.
Fig. 5 is a schematic diagram of an embodiment of the flue gas purification system of the present invention. As shown in fig. 5, the flue gas purification system includes a blast furnace 200, a flue gas dust removal system 300, a TRT power generation device 400, and an absorption liquid injection system 100, wherein the flue gas dust removal system 300 includes a flue gas input channel to be dedusted, a flue gas deduster, and a dedusted flue gas output channel, the flue gas input channel to be dedusted is connected with a furnace top raw gas output pipeline of the blast furnace 200, the dedusted flue gas output channel is connected with an airflow input end of the TRT power generation device 400, an airflow output end of the TRT power generation device 400 is connected with an airflow conveying channel 110 of the absorption liquid injection system 100 (specifically, the complete absorption liquid injection system shown in fig. 1 is adopted), and the purified gas output by the absorption liquid injection system 100 enters a purified gas pipe network.
The flue gas dust remover consists of a gravity dust remover and a filter bag dust remover which are connected in front and back. Wherein, the filter-bag dust remover has adopted by the utility model discloses a tectorial membrane filter bag that the applicant provided, the surface attachment of this tectorial membrane filter bag has high accuracy and high gas permeability polymer fiber membrane, and it is high to the dust collection efficiency of flue gas, ensures that only minute quantity of dust gets into TRT power generation facility 400 and absorption liquid injection system 100 to the long-term normal operating of TRT power generation facility 400 and absorption liquid injection system 100 has been ensured.
The flue gas purification method of the flue gas purification system comprises the following steps: the blast furnace gas discharged from the blast furnace 200 is firstly purified by the flue gas dust removal system 300 and then enters the TRT power generation device 400 to participate in power generation, the purified gas discharged from the TRT power generation device 400 is secondarily purified by the absorption liquid injection system, and the target objects to be absorbed during secondary purification mainly comprise HCl and SOx(mainly sulfur dioxide and sulfur trioxide) and the absorption liquid is NaOH aqueous solution.
The situation that the flue gas purification method is applied to the actual blast furnace gas purification and TRT power generation process is improved. The blast furnace gas purification and TRT power generation process adopts the spray tower introduced in the background technology before, the gas leakage phenomenon caused by corrosion and thinning of the pipeline frequently occurs in the clean gas pipeline behind the spray tower, the gas leakage is mainly concentrated at the pipeline welding part, the flange and the stainless steel corrugated pipe expansion joint, and the potential safety hazard is high. And sampling a certain condensed water sampling point on the clean gas pipeline behind the spray tower for three months continuously, and finding that the condensed water sampling point is acidic. And then, transforming the spray tower into an absorption liquid injection system shown in figure 1, and then using NaOH aqueous solution as the absorption liquid. The front and rear overall use effect pairs are shown in table 1.
TABLE 1
| Scheme(s) | Consumption of absorption liquid | pH value of condensed water at sampling point |
| Spray tower scheme | Multiple purpose | ＜5.5 |
| Scheme of absorption liquid injection system | Chinese character shao (a Chinese character of 'shao') | 6.5-7.5 |
The contents of the present invention have been explained above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the above disclosure of the present invention, all other preferred embodiments and examples obtained by a person skilled in the art without any creative effort shall fall within the protection scope of the present invention.
Claims (10)
1. An absorption liquid injection system comprising:
an air flow transport passage for transporting an air flow containing an object to be absorbed; and
the absorption liquid injection device is used for injecting absorption liquid for absorbing the target object to be absorbed into the airflow conveying channel, and the characteristic that the target object to be absorbed is absorbed by the absorption liquid belongs to a heat release process on the whole;
the method is characterized in that:
the airflow conveying channel is provided with a channel expansion part; and is
The nozzle of the absorbing liquid injection device is positioned in front of the channel expansion part and close to the inlet of the channel expansion part.
2. The absorbent injection system according to claim 1, wherein: the absorption liquid injection device is an absorption liquid injection device which enables absorption liquid to act on the air flow in a fog drop mode.
3. The absorbent injection system according to claim 1, wherein: the absorption liquid injection device uses a downstream jet, and the direction of the downstream jet is consistent with the direction of an airflow conveying channel where the downstream jet is located.
4. The absorbent injection system according to claim 1, wherein: the absorption liquid jetting device comprises a plurality of jetting units which are uniformly distributed along the periphery of one cross section of the airflow conveying channel, and each jetting unit is provided with a corresponding jet.
5. The absorbent injection system according to claim 1, wherein: the target object to be absorbed is an acidic substance; the absorption liquid is water or alkali liquor.
6. The absorbent injection system according to claim 5, wherein: the target substance to be absorbed is mainly HCl and/or SOx(ii) a The absorption liquid is water or NaOH water solution.
7. The absorbent injection system according to claim 5, wherein the absorbent supply source connected to said absorbent injection means comprises:
a first supply flow path for supplying water to the absorbent injector, the first supply flow path including a first power unit for supplying power to the first supply flow path and a first supply amount controller for adjusting a supply amount of the first supply flow path;
a second supply flow path for supplying the absorbing liquid injection device with an alkali liquid, and having a second power device for powering the second supply flow path and a second supply amount control device for adjusting the supply amount of the second supply flow path; and
a third supply flow path for joining the output end of the first supply flow path and the output end of the second supply flow path and connecting the third supply flow path to the absorbent injecting device;
the first supply amount control device is a control device that adjusts the supply amount of the first supply flow path by the temperature of the air flow passing through the absorbent liquid injection system;
the second supply amount control means is a control means for adjusting the supply amount of the second supply flow path by the pH of the absorbent after use in the absorbent injection system.
8. The absorbent injection system according to claim 1, wherein: the air flow conveying channel comprises a tower body used for conveying ascending air flow and an air inlet pipe located on the side wall of the tower body, the part inside the tower body communicated with the air inlet pipe forms a channel expansion part relative to the air inlet pipe, a nozzle of the absorption liquid injection device is located in the air inlet pipe and close to the connection part between the air inlet pipe and the tower body, and a liquid storage structure is arranged below the channel expansion part.
9. The absorbent injection system of claim 8, wherein: the tower body is internally provided with a gas-liquid separation device for carrying out gas-liquid separation on the ascending gas flow to be output out of the tower body; the gas-liquid separation equipment comprises a cyclone separation unit group, the cyclone separation unit group comprises a plurality of cyclone separation units distributed on an ascending air flow main channel of the tower body, the cyclone separation units subdivide the ascending air flow main channel into a certain number of air flow sub-channels, each cyclone separation unit comprises a cylinder body used for forming the corresponding air flow sub-channel and a cyclone guide disc arranged in the cylinder body, and each cyclone guide disc is provided with a core part and cyclone guide blades arranged on the core part and arranged around the core part at intervals.
10. Flue gas purification system, its characterized in that includes:
the flue gas dedusting system comprises a flue gas input channel to be dedusted, a flue gas deduster and a dedusted flue gas output channel, wherein the flue gas input channel to be dedusted is connected with a flue gas generating source, and the flue gas generating source comprises but is not limited to an industrial kiln;
an absorbing liquid injection system, which adopts the absorbing liquid injection system as claimed in any one of claims 1 to 9, wherein the airflow conveying channel of the absorbing liquid injection system is connected with the dedusted flue gas output channel of the flue gas dedusting system.
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| CN201920260905.0U CN210097370U (en) | 2019-02-28 | 2019-02-28 | Absorption liquid injection system and flue gas purification system using same |
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| CN109833765A (en) * | 2019-02-28 | 2019-06-04 | 成都瑞柯林工程技术有限公司 | Absorbing liquid injection system and the flue gas purification system and flue gas purifying method for applying it |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109833765A (en) * | 2019-02-28 | 2019-06-04 | 成都瑞柯林工程技术有限公司 | Absorbing liquid injection system and the flue gas purification system and flue gas purifying method for applying it |
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