CN211069599U

CN211069599U - Ammonia desulphurization system for removing chloride ions

Info

Publication number: CN211069599U
Application number: CN201921204437.1U
Authority: CN
Inventors: 王生公; 曹彦
Original assignee: Nanjing Longyuan Environment Co Ltd
Current assignee: Guoneng Longyuan environmental protection Nanjing Co.,Ltd.
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-07-24
Anticipated expiration: 2029-07-29

Abstract

The utility model discloses an ammonia desulfurization system for removing chloride ions, which comprises a cyclone separator, an evaporation concentration crystallization tower, an absorption tower and an ammonium sulfide dryer, during operation, boiler flue gas is treated by the cyclone separator and then is mixed with room temperature air conveyed by a variable frequency fan, then enters the evaporation concentration crystallization tower to carry out evaporation concentration on ammonium sulfate solution, the ammonium sulfate solution after evaporation concentration enters the ammonium sulfide dryer to carry out drying treatment, flue gas flowing out of the evaporation concentration crystallization tower enters the absorption tower to absorb sulfur dioxide gas in the flue gas, the treated flue gas passes through a second spray layer and a second demister and then is discharged from a second flue gas outlet, in the utility model, the cyclone separator is arranged to primarily remove dust from the boiler flue gas, thereby improving the work efficiency of ammonia desulfurization, the liquid sprayed by the second spray layer is external water, the phenomenon of ammonia escape is prevented in the dissolution of external water and ammonia gas, the utility model discloses simple structure, the operation of being convenient for.

Description

Ammonia desulphurization system for removing chloride ions

Technical Field

The utility model belongs to the technical field of flue gas desulfurization equipment, specifically be an ammonia process desulfurization system who gets rid of chloride ion.

Background

The flue gas refers to the mixture of gas and smoke dust, if the flue gas generated by the boiler is directly discharged into the air, harmful gas and smoke dust in the boiler cause serious pollution to the surrounding environment, and the smoke dust discharged into the air is sucked into the mouths of residents to cause serious damage to the health of the residents around, so the flue gas generated by the boiler needs to be treated firstly to be discharged into the surrounding environment;

in the prior art, when sulfur dioxide in boiler flue gas is subjected to desulfurization treatment, ammonia escape is easily caused, the boiler flue gas also contains chloride ions, fluoride ions and the like, the chloride ions, the fluoride ions and the like in the flue gas are dissolved into circulating liquid, high-concentration chloride ions and fluoride ions can be caused, and the high-concentration chloride ions and the high-concentration fluoride ions have great corrosivity on metals, so that the concentrations of the chloride ions and the fluoride ions also need to be controlled in an ammonia desulfurization device, and the concentration of the chloride ions in an ammonia desulfurization system is controlled to be less than 20000ppm, so that the corrosion on ammonia desulfurization equipment is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an ammonia process desulfurization system who gets rid of chloride ion to solve the ammonia escape that proposes among the above-mentioned background art and during chloride ion, fluoride ion etc. in the flue gas dissolve the entering circulation liquid, can cause high concentration chloride ion and fluoride ion, high concentration chloride ion and fluoride ion have very big corrosivity's problem to the metal.

In order to achieve the above object, the utility model provides a following technical scheme: an ammonia desulfurization system for removing chloride ions comprises a cyclone separator, an evaporation concentration crystallization tower, an absorption tower and an ammonium sulfide dryer, wherein the cyclone separator is connected with the evaporation concentration crystallization tower which is connected with the absorption tower;

the inside of the evaporation concentration crystallization tower is provided with a first spraying layer, a first demister and an evaporation concentration chamber, the first demister is positioned at the upper part of the first spraying layer, the evaporation concentration chamber is positioned at the lower part of the first spraying layer, the side surface of the evaporation concentration crystallization tower is provided with a first flue gas inlet, a first ammonia adding pipeline and a first flue gas outlet, the first flue gas outlet is positioned at the upper side of the first demister, the first ammonia adding pipeline and the first flue gas inlet are both positioned at the side surface of the evaporation concentration chamber, the outlet of a cyclone separator is connected with the first flue gas inlet through a first pipeline, a variable frequency fan is arranged on the first pipeline connecting the cyclone separator and the first flue gas inlet, the evaporation concentration chamber and the first demister are connected through a first circulating pipeline, the first circulating pipeline is provided with a first circulating pump, and the first circulating pipeline is also connected with an ammonium sulfide dryer;

a second spraying layer, a second demister, a third spraying layer and an absorption chamber are arranged in the absorption tower, a second flue gas inlet is arranged on the side surface of the absorption tower, second adds ammonia pipeline and adds oxygen pipeline, absorption tower upper portion is equipped with the second exhanst gas outlet, second exhanst gas outlet and the inside intercommunication of absorption tower, the absorption chamber is located the absorption tower lower part, from the top down is equipped with the second defroster between second exhanst gas outlet and the absorption chamber in proper order, the second sprays layer and third and sprays the layer, the second flue gas entry, second adds ammonia pipeline and adds oxygen pipeline and is located the absorption chamber side, absorption chamber and third spray and pass through second circulation pipe connection between the layer, be equipped with the second circulating pump on the second circulation pipe, the second sprays layer and outside water and links to each other, first flue gas outlet and second flue gas entry pass through the pipe connection, pass through the second pipe connection between absorption chamber and the first defroster, be equipped with the third circulating pump on the second pipeline.

As optimization, a first PH meter, a liquid level meter and a defogging differential pressure meter are further arranged in the evaporation concentration crystallization tower.

And optimally, a second PH meter is arranged inside the absorption tower.

As optimization, the second circulating pump and the third spraying layer are respectively provided with three or more than three.

Preferably, the first demister and the second demister are folded plate demisters.

Compared with the prior art, the beneficial effects of the utility model are that: in the utility model, the cyclone separator is arranged to primarily remove dust from the boiler flue gas, remove particles in the boiler flue gas, improve the efficiency of the subsequent evaporative concentration chamber for the evaporative concentration crystallization of ammonium sulfate solution, and improve the efficiency of the desulfurization reaction in the absorption chamber, the first circulating pump is connected with the washing port of the first demister through a pipeline, the liquid pumped by the first circulating pump flows in from the washing port of the first demister, wash the first demister, reduce the temperature of the first demister, prevent the first demister from being easily damaged by the influence of the temperature of the boiler flue gas, the liquid sprayed by the second spraying layer is the outside water, the outside water and ammonia gas are dissolved, prevent the ammonia escape phenomenon, the first demister and the second demister are folded plate demisters, the folded plate demisters are compared with other demisters, the folded plate demisters are shaped like sine curves, and have smooth surfaces, the device is easy to wash, and the blocking risk is reduced; the folded plate demister blades are designed by adopting hooks and ribs, so that very tiny fog drops can be intercepted; and the folded plate defroster is maintained conveniently, ammonium sulfate liquid after absorbing sulfur dioxide in the absorption tower, liquid such as high concentration ammonium salt solution containing chlorine radical and high concentration ammonium salt liquid containing fluorine radical enter the evaporative concentration crystallization tower through the third circulating pump and carry out evaporative concentration crystallization, the solid that produces is ammonium sulfate and a very small amount of ammonium chloride, ammonium fluoride, ammonium sulfate, ammonium chloride and ammonium fluoride not only can be used as fertilizer, also can detach chloride ion and fluoride ion in the system, prevent that high concentration chloride ion and fluoride ion from corroding the equipment in the ammonia process desulfurization system, reduce the life of equipment.

Drawings

FIG. 1 is a schematic view of the overall structure of an ammonia desulfurization system for removing chloride ions according to the present invention.

In the figure: 1-a cyclone separator, 2-an evaporation concentration crystallization tower, 21-a first flue gas inlet, 22-a first ammonia adding pipeline, 23-a first spraying layer, 24-a first demister, 25-a first flue gas outlet, 26-a first circulating pump, 27-a first PH meter, 28-a liquid level meter, 29-a demisting pressure difference meter, 30-an evaporation concentration chamber and 3-an absorption tower, 31-a second flue gas inlet, 32-a second ammonia adding pipeline, 33-a second spraying layer, 34-a second demister, 35-a second flue gas outlet, 36-a second circulating pump, 37-a third spraying layer, 38-an oxygen adding pipeline, 39-an absorption chamber, 40-a second PH meter, a 4-variable frequency fan, a 5-ammonium sulfide dryer and 6-a third circulating pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the utility model provides an ammonia desulfurization system for removing chloride ions, which comprises a cyclone separator 1, an evaporation concentration crystallization tower 2, an absorption tower 3 and an ammonium sulfide dryer 5, wherein the cyclone separator 1 is connected with the evaporation concentration crystallization tower 2, the evaporation concentration crystallization tower 2 is connected with the absorption tower 3, the evaporation concentration crystallization tower 2 is connected with the ammonium sulfide dryer 5, the cyclone separator 1 is, for example, a separator with the model of FH-10S, the cyclone separator 1 can remove dust in introduced flue gas to facilitate the subsequent reaction, and the ammonium sulfide dryer 5 is, for example, a dryer with the model of ZDG7.5 × 0.60.60, for drying ammonium sulfate liquid in the evaporation concentration crystallization tower 2;

a first spraying layer 23, a first demister 24 and an evaporation concentration chamber 30 are arranged in the evaporation concentration crystallization tower 2, the first demister 24 is positioned at the upper part of the first spraying layer 23, the evaporation concentration chamber 30 is positioned at the lower part of the first spraying layer 23, a first flue gas inlet 21, a first ammonia adding pipeline 22 and a first flue gas outlet 25 are arranged on the side surface of the evaporation concentration crystallization tower 2, the first flue gas outlet 25 is positioned at the upper side of the first demister 24, the first ammonia adding pipeline 22 and the first flue gas inlet 21 are both positioned on the side surface of the evaporation concentration chamber 30, the outlet of the cyclone separator 1 is connected with the first flue gas inlet 21 through a first pipeline, a variable frequency fan 4 is arranged on the first pipeline connecting the cyclone separator 1 with the first flue gas inlet 21, the evaporation concentration chamber 30 and the first demister 24 are connected through a first circulating pipeline, a first circulating pump 26 is arranged on the first circulating pipeline, and an ammonium sulfide dryer 5 is further connected on the first circulating pipeline, the liquid sprayed by the first spraying layer 23 is liquid such as sodium sulfate solution extracted by the first circulating pump 26 from the evaporation concentration chamber 30, the first circulating pump 26, the second circulating pump 36 and the fourth circulating pump 6 are pumps with models of 300UFB-ZK-900-34, for example, the design of the first ammonia adding pipeline 22 is adopted, ammonia gas is introduced into the evaporation concentration chamber 30, so that the PH of the liquid in the evaporation concentration chamber 30 is adjusted to be 5-6, the design of the first spraying layer 23 and the first circulating pump 26 is adopted, the contact area between the liquid sprayed by the first spraying layer 23 and the ammonia water is increased, the liquid in the evaporation concentration chamber 30 and the ammonia water are uniformly mixed, the first circulating pump 26 is connected with the washing port of the first demister 24 through a pipeline, the liquid extracted by the first circulating pump 26 flows in from the washing port of the first demister 24, the first demister 24 is washed, the temperature of the first demister 24 is reduced, the first demister 24 is prevented from being easily damaged by the influence of the temperature of the boiler flue gas, the boiler flue gas passing through the cyclone separator 1 is mixed with the room temperature air introduced by the variable frequency fan 4, so that the temperature range of the mixed flue gas is 140-240 ℃, a temperature sensor is arranged on a pipeline for mixing the flue gas passing through the cyclone separator 1 and the variable frequency fan 4, the temperature sensor is selected from a sensor with the model number of WZP-187, the mixed temperature is monitored in real time, the temperature of the flue gas coming out of the first flue gas outlet 25 is controlled to be 60-70 ℃, a temperature sensor is also arranged on a pipeline of the first flue gas outlet 25, the temperature sensor is selected from a temperature sensor with the model number of WZP-187, the flue gas flowing into the absorption tower 3 from the second flue gas inlet 31 is controlled to be 60-70 ℃, and the absorption of the absorption tower 3 on the sulfur dioxide in the flue gas, the liquid absorbing sulfur dioxide from the absorption tower 3 flows into the evaporation concentration crystallization tower through the third circulating pump 6, when the absorption tower 3 absorbs sulfur dioxide, the liquid is continuously circulated through the second circulating pump 36, a certain amount of high-concentration ammonium salt solution containing chlorine radical and high-concentration ammonium salt solution containing fluorine radical are led out, the liquid absorbing sulfur dioxide, the high-concentration ammonium salt solution containing chlorine radical and the high-concentration ammonium salt solution containing fluorine radical enter the evaporation concentration crystallization tower 2 through the third circulating pump 6, the ammonium sulfate, the high-concentration ammonium salt containing chlorine radical and the high-concentration ammonium salt containing fluorine radical are evaporated, concentrated and crystallized, the generated solid is ammonium sulfate and a small amount of ammonium chloride and ammonium fluoride, the ammonium sulfate, the ammonium chloride and the ammonium fluoride not only can be used as fertilizer, but also can remove chloride ions and fluorine ions, and the corrosion of equipment in the ammonia desulphurization system by the high-concentration chloride ions and the fluorine ions is prevented, the service life of the equipment is reduced, and when the high-concentration ammonium salt solution is treated by evaporation and drying, impurities such as fly ash and the like in the absorption tower 3 are practically and forcibly removed, so that the ammonium sulfate crystallization environment in the ammonia desulphurization device can be obviously improved, and the absorption of sulfur dioxide is promoted;

the absorption tower 3 is internally provided with a second spraying layer 33, a second demister 34, a third spraying layer 37 and an absorption chamber 39, the side surface of the absorption tower 3 is provided with a second flue gas inlet 31, a second ammonia adding pipeline 32 and an oxygen adding pipeline 38, the upper part of the absorption tower 3 is provided with a second flue gas outlet 35, the second flue gas outlet 35 is communicated with the inside of the absorption tower 3, the absorption chamber 39 is positioned at the lower part of the absorption tower 3, the second demister 34, the second spraying layer 33 and the third spraying layer 37 are sequentially arranged from top to bottom between the second flue gas outlet 35 and the absorption chamber 39, the second flue gas inlet 31, the second ammonia adding pipeline 32 and the oxygen adding pipeline 38 are positioned at the side surface of the absorption chamber 39, the absorption chamber 39 is connected with the third spraying layer 37 through a second circulating pipeline, the second circulating pump 36 is arranged on the second circulating pipeline, the second spraying layer 33 is connected with an external water, the first flue gas outlet 25 is connected with the second flue gas inlet 31 through a pipeline, the absorption chamber 39 is connected with the first demister 24 through a second circulating pump, the third spraying layer 6 is arranged on the second pipeline, the third spraying layer 33 is connected with an external water, the first flue gas outlet 33, the third spraying layer 37 is designed to increase the absorption chamber 39, the absorption efficiency of the ammonium sulfite solution and the ammonium sulfite solution, the ammonium sulfite solution is designed to increase of the ammonium sulfite solution, the ammonium sulfite solution is designed to increase of the ammonium sulfite solution in the ammonium sulfite solution and the ammonium sulfite solution, the ammonium sulfite solution in the ammonium sulfite solution, the ammonium sulfite solution is designed for the ammonium sulfite solution, the ammonium sulfite solution is designed for the ammonium sulfite solution.

The first pipeline, the second pipeline, the pipeline between the first circulation pipeline and the first spray tower 23, the pipeline between the first circulation pipeline and the ammonium sulfide dryer 5 and the second circulation pipeline are all provided with switch valves, the design of the switch valves on the first pipeline, the second pipeline and the second circulation pipeline can control the flow of liquid, the pipelines between the first circulation pipeline and the first spray tower 23 and the pipelines between the first circulation pipeline and the ammonium sulfide dryer 5 are all provided with switch valves, the rotation directions of the switch valves on the pipelines between the first circulation pipeline and the first spray tower 23 and the switch valves on the pipelines between the first circulation pipeline and the ammonium sulfide dryer 5 are opposite, so that the liquid is controlled to flow to the evaporation concentration chamber 30 or flow to the ammonium sulfide dryer 5.

The evaporation concentration crystallization tower 2 is also internally provided with a first PH meter 27, a liquid level meter 28 and a defogging differential pressure meter 29, the first PH meter 27 and the second PH meter 40 are selected from PH meters with the models of PH-1186, the liquid level meter 28 is selected from a liquid level meter with the model of TM-UHZ, the defogging differential pressure meter 29 is selected from a meter with the model of CYW-100B, ammonia water is continuously introduced into the evaporation concentration crystallization tower 2, the PH value in the evaporation concentration chamber 30 is adjusted to be 3-4, the PH value is in the range of 3-4, thereby being beneficial to evaporation concentration crystallization of ammonium sulfate, the setting of the liquid level meter 28 is used for controlling the liquid level in the evaporation concentration chamber 30, and the setting of the defogging differential pressure meter 29 is used for controlling the flushing time of the first defogger 24.

Inside second PH meter 40 that is equipped with of absorption tower 3, continuous letting in the aqueous ammonia in to second ammonia adding pipeline 32, the PH of adjusting absorption chamber 39 is 5-6, can increase the desulfurization reaction to sulfur dioxide and the oxidation reaction of ammonium bisulfite in the absorption chamber 39, be equipped with control panel on the box 1, first PH meter 27, level gauge 28, defogging differential pressure meter 29, second PH meter 40 and temperature sensor all with control panel electric connection, control panel is used for monitoring first PH meter 27, level gauge 28, defogging differential pressure meter 29, the data change of second PH meter 40 and temperature sensor, and real-time analysis, according to the result of analysis, control opening and closing of ooff valve on each pipeline.

The second circulating pump 36 and the third spraying layer 37 are respectively provided with three or more than three, one second circulating pump 36 and one third spraying layer 37 are matched for use, the ammonium sulfite solution extracted from the absorption chamber flows out of the absorption chamber 39 from the third spraying layer 37 through the second circulating pump 36, the flow speed of the ammonium sulfite liquid, the ammonium bisulfite liquid and other liquids in the absorption chamber 39 can be increased through the quantity design of the second circulating pump 36 and the third spraying layer 37, and the absorption efficiency of sulfur dioxide and ammonia water in the flue gas is increased.

The first demister 24 and the second demister 34 are folded plate demisters, each folded plate demister is composed of two layers of folded plate demister blades and three layers of flushing water pipes, the first layer of demisters removes coarse particle fog droplets, the second layer of demisters removes fine particle fog droplets, and compared with other demisters, the folded plate demister has the advantages that the blades of the folded plate demister are similar to sine curves in shape, the surface is smooth, the washing is easy, the blocking risk is reduced, and the like; the folded plate demister blades are designed by adopting hooks and ribs, so that very tiny fog drops can be intercepted; and the folded plate demister is convenient to maintain.

The working principle is as follows: the utility model provides a get rid of ammonia process desulfurization system of chloride ion, this ammonia process desulfurization system includes cyclone 1, evaporation concentration crystallization tower 2, absorption tower 3 and ammonium sulfide desiccator 5, when ammonia process desulfurization system worked, boiler flue gas first through cyclone 1 carry out preliminary treatment to the flue gas after with the room temperature air that variable frequency fan 4 conveyed mixes, keep the temperature at 140-.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An ammonia desulfurization system for removing chloride ions is characterized in that: the ammonia desulfurization system comprises a cyclone separator (1), an evaporation concentration crystallization tower (2), an absorption tower (3) and an ammonium sulfide dryer (5), wherein the cyclone separator (1) is connected with the evaporation concentration crystallization tower (2), the evaporation concentration crystallization tower (2) is connected with the absorption tower (3), and the evaporation concentration crystallization tower (2) is connected with the ammonium sulfide dryer (5);

the device is characterized in that a first spraying layer (23), a first demister (24) and an evaporation concentration chamber (30) are arranged in the evaporation concentration crystallization tower (2), the first demister (24) is positioned at the upper part of the first spraying layer (23), the evaporation concentration chamber (30) is positioned at the lower part of the first spraying layer (23), a first flue gas inlet (21), a first ammonia adding pipeline (22) and a first flue gas outlet (25) are arranged on the side surface of the evaporation concentration crystallization tower (2), the first flue gas outlet (25) is positioned at the upper side of the first demister (24), the first ammonia adding pipeline (22) and the first flue gas inlet (21) are both positioned on the side surface of the evaporation concentration chamber (30), the outlet of the cyclone separator (1) is connected with the first flue gas inlet (21) through a first pipeline, a variable frequency fan (4) is arranged on the first pipeline connected with the cyclone separator (1) and the first flue gas inlet (21), the evaporation concentration chamber (30) is connected with the first demister (24) through a first circulating pipeline, a first circulating pump (26) is arranged on the first circulating pipeline, and an ammonium sulfide dryer (5) is connected to the first circulating pipeline;

the absorption tower is characterized in that a second spraying layer (33), a second demister (34), a third spraying layer (37) and an absorption chamber (39) are arranged inside the absorption tower (3), a second flue gas inlet (31), a second ammonia adding pipeline (32) and an oxygen adding pipeline (38) are arranged on the side surface of the absorption tower (3), a second flue gas outlet (35) is arranged on the upper portion of the absorption tower (3), the second flue gas outlet (35) is communicated with the inside of the absorption tower (3), the absorption chamber (39) is positioned on the lower portion of the absorption tower (3), the second demister (34), the second spraying layer (33) and the third spraying layer (37) are sequentially arranged between the second flue gas outlet (35) and the absorption chamber (39) from top to bottom, the second flue gas inlet (31), the second ammonia adding pipeline (32) and the oxygen adding pipeline (38) are positioned on the side surface of the absorption chamber (39), and the absorption chamber (39) and the third spraying layer (37) are connected through a second circulation pipeline, the second circulating pipeline is provided with a second circulating pump (36), the second spraying layer (33) is connected with external water, the first flue gas outlet (25) is connected with the second flue gas inlet (31) through a pipeline, the absorption chamber (39) is connected with the first demister (24) through a second pipeline, and the second circulating pipeline is provided with a third circulating pump (6).

2. The ammonia desulfurization system for removing chloride ions according to claim 1, wherein: the evaporation concentration crystallization tower (2) is also internally provided with a first pH meter (27), a liquid level meter (28) and a demisting differential pressure meter (29).

3. The ammonia desulfurization system for removing chloride ions according to claim 2, wherein: and a second pH meter (40) is arranged in the absorption tower (3).

4. The ammonia desulfurization system for removing chloride ions according to claim 3, wherein: the second circulating pump (36) and the third spraying layer (37) are respectively provided with three or more than three.

5. The ammonia desulfurization system for removing chloride ions according to claim 4, wherein: the first demister (24) and the second demister (34) are folded plate demisters.