Grouped self-sustaining one-step purification equipment

Abstract

The present application discloses a grouped self-sustaining one-step purification device for purifying flue gas containing water vapor, ammonia, and acidic pollutants; the low-temperature condensation module of the purification device includes a cooling water pipe bundle vertically arranged and arranged in an array in the flue gas purification channel, and end joint assemblies connected to the upper and lower ends of the cooling water pipe bundle. The end joint assemblies and the cooling water pipe bundle together form a cooling water circulation pipeline for cooling water to flow from the cooling water inlet to the cooling water return port; the cooling water pipe bundle is divided into multiple cooling water pipe groups along the flue gas flow direction, and each cooling water pipe group includes multiple rows of cooling water pipes arranged along the flue gas flow direction; the cooling water between multiple cooling water pipe groups is not connected in the cooling water pipe bundle, and the cooling water flow rate in the cooling water pipe group decreases sequentially along the flue gas flow direction.

Description

Technical Field

[0001] The present application relates to the technical field of environmental protection equipment, and more particularly, to a grouped self-sustained one-step purification equipment. Background Art

[0002] Currently, most of the cement kiln tail gas NOx treatment technologies still use ammonia source (such as ammonia water, urea, etc.) reducing agents. Due to the limitation of the denitrification rate, there is more or less secondary air pollution caused by the phenomenon of ammonia escape due to the excessive use of reducing agents. In related technologies, when treating the cement kiln tail gas, it is necessary to cool the tail gas. Currently, the adopted method is to contact the cement kiln tail gas with a cooling water pipe and exchange heat with the cold source flowing in the cooling water pipe to cool down.

[0003] Regarding the problem of ammonia escape, a recovery and circulation system for escaped ammonia in the cement kiln ammonia-based denitrification tail gas is disclosed in related technologies. It reduces the content of escaped ammonia in the tail gas by combining a spray tower, a heat exchanger, a storage tank, a receiving tank, an absorbent, etc. However, this related technology has the disadvantages of large equipment volume, complex ammonia removal process, high cost, and large amount of wastewater treatment. Summary of the Invention

[0004] The main purpose of the present application is to provide a grouped self-sustained one-step purification equipment to solve the technical problems of large volume of ammonia removal equipment, complex ammonia removal process, high cost, and large amount of wastewater treatment in related technologies.

[0005] To achieve the above purpose, the present application provides a grouped self-sustained one-step purification equipment for purifying flue gas containing water vapor, ammonia, and acidic pollutants; the purification equipment includes:

[0006] A flue gas inlet and a flue gas outlet, and a flue gas purification channel from the flue gas inlet to the flue gas outlet;

[0007] A low-temperature condensation module disposed in the flue gas purification channel; the low-temperature condensation module includes a cooling water pipe bundle vertically disposed and arranged in an array in the flue gas purification channel and end joint assemblies connected to the upper and lower ends of the cooling water pipe bundle. The end joint assemblies and the cooling water pipe bundle together form a cooling water circulation pipeline for cooling water to flow from the cooling water inlet to the cooling water return port; the cooling water pipe bundle is divided into multiple cooling water pipe groups along the flue gas flow direction, and each cooling water pipe group includes multiple rows of cooling water pipes arranged along the flue gas flow direction; the cooling water between multiple cooling water pipe groups is not connected in the cooling water pipe bundle and the cooling water flow rate in the cooling water pipe group decreases sequentially along the flue gas flow direction;

[0008] The low-temperature condensation module cools and condenses the flue gas entering the flue gas purification channel from the flue gas inlet, condenses the water vapor into condensed water, and the ammonia and the acidic pollutants dissolve in the condensed water and undergo an acid-base neutralization reaction in the condensed water to form non-volatile salts that are easily soluble in the condensed water.

[0009] Optionally, the cooling water pipe is a circular cooling water pipe; the end joint assembly includes an upper end joint assembly and a lower end joint assembly, both including end joints with the same structure. The end joint is a circular pipe elbow that connects the ends of two adjacent circular cooling water pipes in two adjacent rows of the circular cooling water pipes.

[0010] Optionally, each cooling water pipe group is connected to a water collecting pipe and a water return pipe.

[0011] Optionally, the cooling water pipe bundle is arranged in a staggered tube bundle array, and in each cooling water pipe group, two adjacent rows of cooling water pipes are staggered in the flue gas flow direction and there is no gap between their orthographic projection surfaces.

[0012] Optionally, it includes a box body, which includes an upper box plate, a lower box plate, a front box plate and a rear box plate that are hermetically connected. The left and right sides of the box body are open as the flue gas inlet and the flue gas outlet; water pipe installation holes for installing the upper end and the lower end of the cooling water pipe bundle are opened on the upper box plate and the lower box plate, and an annular groove is formed along the circumferential direction of the hole wall of the water pipe installation hole; the end of the cooling water pipe is arranged in the water pipe installation hole, and a part of the cooling water pipe body corresponding to the annular groove is provided with an annular protrusion, and the annular protrusion is hermetically embedded in the annular groove so that the end of the cooling water pipe body forms a curved surface seal with the water pipe installation hole.

[0013] Optionally, a sealant is provided in the annular groove, and the annular groove is coaxially arranged with the water pipe installation hole; a rubber gasket is also provided in the annular groove, and the annular protrusion presses the rubber gasket tightly in the annular groove.

[0014] Optionally, the annular groove includes a plurality of grooves arranged at intervals along the circumferential direction of the hole wall of the water pipe installation hole, and the extending depths of the plurality of grooves on the hole wall are different.

[0015] Optionally, a plurality of annular grooves are provided and distributed along the axial direction of the water pipe installation hole.

[0016] Optionally, it further includes at least one demisting, water collecting and water blocking plate vertically arranged at the flue gas outlet, and the plate surface of the demisting, water collecting and water blocking plate is a zigzag surface; at least part of the demisting, water collecting and water blocking plate is formed with long round holes extending vertically along the surface of the demisting, water collecting and water blocking plate; a wire mesh is also provided outside the demisting, water collecting and water blocking plate.

[0017] Optionally, it further includes a condensate water collection device disposed at the bottom of the water-cooled low-temperature condensation module for collecting the condensate water, and the condensate water collection device is connected to a condensate water discharge port. Description of the Drawings

[0018] The drawings forming a part of this application are used to provide a further understanding of this application, making other features, objectives, and advantages of this application more obvious. The schematic embodiments and descriptions of the drawings of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0019] Figure 1A is a schematic process flow diagram of the self-sustaining one-step purification process according to an embodiment of this application;

[0020] Figure 1B is a schematic structural diagram (front view) of the self-sustaining one-step purification device according to an embodiment of this application;

[0021] Figure 1C is Figure 1B the top view of;

[0022] Figure 1D is a structural diagram (front view) of the self-sustaining one-step purification device according to an embodiment of this application;

[0023] Figure 1E is Figure 1D the side view of;

[0024] Figure 2A is a schematic structural diagram (front view) of the self-sustaining one-step purification device (round tube) according to an embodiment of this application;

[0025] Figure 2B is Figure 2A the top view of;

[0026] Figure 2C is a structural diagram (front view) of the self-sustaining one-step purification device (round tube grouped) according to an embodiment of this application;

[0027] Figure 2D is Figure 2C the top view of;

[0028] Figure 2E is a perspective view of the self-sustaining one-step purification device (round tube grouped) according to an embodiment of this application;

[0029] Figure 3A is the front view of the low-temperature condensation module (cooling water circulating along grouped water pipes) according to an embodiment of this application;

[0030] Figure 3B is Figure 3A the top view of;

[0031] Figure 3C is Figure 3A the left view of;

[0032] Figure 3D is the three - dimensional sectional view of the low - temperature condensation module (cooling water circulates along the grouped water pipes) of the embodiment of the present application;

[0033] Figure 4A is the front view of the low - temperature condensation module (cooling water in each straight - through area circulates along the grouped water pipes and the cooling water volume is adjustable) of the embodiment of the present application;

[0034] Figure 4B is Figure 4A the top view of;

[0035] Figure 4C is the left view of the low - temperature condensation module (cooling water in each straight - through area circulates along the grouped water pipes and the cooling water volume is adjustable) of the embodiment of the present application;

[0036] Figure 5A is the front view of the low - temperature condensation module (cooling water in each straight - through area is adjustable) of the embodiment of the present application;

[0037] Figure 5B is Figure 5A the top view of;

[0038] Figure 5C is Figure 5A the left view of;

[0039] Figure 6A is the front view of the low - temperature condensation module (cooling water in each straight - through area circulates along the grouped water pipes and the cooling water volume is adjustable) of the embodiment of the present application;

[0040] Figure 6B is Figure 6A the top view of;

[0041] Figure 6C is Figure 6A the left view of;

[0042] Figure 6D is the three - dimensional sectional view of the low - temperature condensation module (cooling water in each straight - through area circulates along the grouped water pipes and the cooling water volume is adjustable) of the embodiment of the present application;

[0043] Figure 7A is the top view of the arc - shaped rhombic tube of the embodiment of the present application;

[0044] Figure 7B is the front view of the arc - shaped rhombic tube of the embodiment of the present application;

[0045] Figure 7C is the sectional view of the arc - shaped rhombic tube of the embodiment of the present application;

[0046] Figure 8 It is a diagram of the arrangement of arc-rhombus tubes in an embodiment of the present application;

[0047] Figure 9A It is the front view of the arc-rhombus tube before tube expansion in an embodiment of the present application;

[0048] Figure 9B It is Figure 9A a partial enlarged view of;

[0049] Figure 10A It is the rear view of the arc-rhombus tube after tube expansion in an embodiment of the present application;

[0050] Figure 10B It is Figure 10A a partial enlarged view of;

[0051] Figure 10C It is Figure 10A the top view of;

[0052] Figure 11A It is the front view of the modular self-sustaining one-step purification equipment in an embodiment of the present application;

[0053] Figure 11B It is the top view of the modular self-sustaining one-step purification equipment in an embodiment of the present application;

[0054] Figure 11C It is the left view of the modular self-sustaining one-step purification equipment in an embodiment of the present application;

[0055] Figure 12 It is the schematic diagram of the structure of the demisting, water collecting and water blocking plate in an embodiment of the present application;

[0056] Figure 13 It is the simplified schematic diagram of the convective heat transfer of the low-temperature condensation module in an embodiment of the present application.

[0057] Among them, 1 is a low-temperature condensation module, 101 is a box body, 1011 is an upper box plate, 1012 is a lower box plate, 1013 is a front box plate, 1014 is a rear box plate, 102 is a cooling water pipe bundle, 102a is a cooling water pipe, 1020 is a cooling water pipe body, 1020b is a large arc end, 1020a is a small arc end, 1020c is a straight edge, 1022 is a plug, 103 is a cooling water inlet pipe, 1031 is a flow regulating valve, 1032 is a cooling water inlet main pipe, 1033 is a water distribution pipe, 104 is a cooling water return pipe, 105 is a round pipe elbow, 2 is a spraying device, 3 is an atomizing device, 4 is a flue gas inlet, 5 is a flue gas outlet, 9 is a water pump, 10 is a condensate discharge port, 11 is an upper water tank, 111 is an upper water tank section, 12 is a lower water tank, 121 is a lower water tank section, 13 is a demisting, water collecting and water blocking plate, 14 is a wire mesh, 15 is a rubber gasket, 16 is a sealant, 17 is an annular groove, 18 is an annular protrusion, 19 is an annular clamping protrusion, 20 is an installation foundation, 21 is a lower joint, 211 is a plug, 212 is a sealing ring, 213 is a joint, 22 is an upper joint, 23 is a condensate collecting device, 24 is a cooling water pipe area, 103a is a cooling water inlet, 104a is a cooling water return port, 102b is a water pipe installation hole. Detailed implementation manners

[0058] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0059] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of this application described herein.

[0060] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0061] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0062] In addition, terms such as "arranged", "provided with", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0063] In addition, the meaning of the term "plurality" should be two or more.

[0064] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0065] Currently, for the treatment of high-temperature flue gas, such as the NOx treatment technology for cement kiln flue gas, the vast majority still uses ammonia source (such as ammonia water, urea, etc.) as the reducing agent. Due to the limitation of the denitrification rate, there is more or less secondary air pollution caused by the phenomenon of ammonia escape due to the excessive use of the reducing agent.

[0066] The known prior art discloses a recovery and recycling system for escaped ammonia in cement kiln ammonia-based denitrification flue gas and its control method. The recovery and recycling system includes a spray tower, a heat exchanger, a storage tank, and a receiving tank. The denitrification flue gas is first transported by a fan to the heat exchanger for cooling, then enters the tower from the bottom of the spray tower, and then the absorbent in the storage tank is pumped to the spray tower by a pump to contact and react with the upward denitrification flue gas, obtaining ammonia-containing absorbent and ammonia-removed flue gas. After that, the ammonia-containing absorbent flows into the receiving tank, and the supernatant after precipitation is pumped and recycled into the spray tower to repeatedly contact the denitrification flue gas until a saturated ammonia absorbent is formed. The slurry settled at the bottom of the receiving tank is regularly pumped to the cement kiln through a pump. The saturated ammonia absorbent is pumped to an ammonia water storage tank and mixed with ammonia water for denitrification reaction. Ammonium salts decompose ammonia during the SNCR (Selective Non-Catalytic Reduction) denitrification process as part of the ammonia source to react with nitrogen oxides, thereby realizing the recycling of escaped ammonia.

[0067] Although this prior art can solve the problem of ammonia escape, it has the defects of low ammonia removal efficiency, large equipment volume, and high cost. The specific analysis is as follows:

[0068] 1. This prior art requires heat exchange first, then spraying, then collection, and then recycling for flue gas treatment. The multiple treatment steps lead to a complex ammonia removal process and low ammonia removal efficiency. Moreover, due to the complex process, heat exchangers, spray towers, storage tanks, receiving tanks, etc. are required, resulting in a large overall ammonia removal equipment volume and high cost.

[0069] 2. The prior art discloses that flue gas is first transported to a heat exchanger for cooling. However, it can be understood from the entire technical solution disclosed in the prior art that the purpose of using a pre-positioned heat exchanger to cool the flue gas in the prior art is, on the one hand, to avoid the situation that volatile high-temperature ammonia is not easily absorbed by the absorbent in the subsequent spray tower process. By performing limited cooling of the high-temperature flue gas through the pre-positioned heat exchanger, the absorption efficiency of ammonia in the spray tower can be improved. On the other hand, pre-cooling the high-temperature ammonia through the heat exchanger can reduce the working pressure of the spray tower. However, the prior art still uses a spray tower, indicating that the means for solving the ammonia escape problem in the prior art is still the traditional idea of ammonia absorption in a spray tower. Using a spray tower has problems such as a large amount of spray water and a large amount of subsequent sewage purification treatment.

[0070] 3. The ammonia-containing absorbent in the prior art needs a long time to precipitate when flowing into the receiving tank, which further leads to low ammonia removal efficiency in the prior art.

[0071] Therefore, overall, the ammonia escape recovery and circulation system in the prior art has problems such as complex processes, low ammonia removal efficiency, large equipment volume, high cost, and a large amount of wastewater treatment.

[0072] To solve the problems of ammonia escape and the complex processes, low ammonia removal efficiency, large equipment volume, high cost, and large amount of wastewater treatment in the above-known prior art, the present application proposes a self-sustaining one-step purification device and purification method in which the components in the flue gas to be treated can complete physical and chemical reactions by themselves to achieve ammonia absorption (self-sustaining), with a small equipment volume (compact), simple process (one-step method), low cost, and a small amount of wastewater treatment. The purification device provided by the present application can not only be applied to the purification scenario of cement kiln flue gas, but also can be applied to scenarios such as flue gas purification in power plants or coal yards. However, it should be noted that the purification device provided by the present application can only be applicable to the purification treatment of flue gas containing water vapor, ammonia, and acidic pollutants.

[0073] As a preferred embodiment of the present application, the purification device is applied to the purification of ammonia-based denitrification flue gas in a cement kiln. Currently, ammonia escape generally exists in the flue gas of cement kilns. The flue gas emitted by cement kilns is high-temperature flue gas containing water vapor, ammonia, and acidic pollutants.

[0074] The purification device of this embodiment has a flue gas inlet 4, a flue gas outlet 5, and a flue gas purification channel from the flue gas inlet 4 to the flue gas outlet 5. The purification device further includes a low-temperature condensation module 1, and the low-temperature condensation module 1 is arranged in the flue gas purification channel.

[0075] The main structure of the above purification device can achieve the purification treatment of cement kiln flue gas, and its purification principle is as follows:

[0076] The flue gas from the cement kiln enters the flue gas purification channel through the flue gas inlet 4 of the purification device. The low-temperature condensation module 1 in the flue gas channel cools and condenses the incoming flue gas, cooling the water vapor in the flue gas to condense it into condensed water (ideally, it is desired to condense all the water vapor into condensed water). The ammonia and acidic pollutants (such as SO2 and CO2) contained in the flue gas dissolve in the condensed water (physical purification). This is the first layer of purification achieved by the purification device of this application. However, due to the high temperature of the flue gas, the ammonia or acidic pollutants dissolved in the condensed water are likely to volatilize from the condensed water. But the innovation of the purification device of this application is that at the same time, the ammonia and acidic pollutants dissolve in the condensed water to undergo an acid-base neutralization reaction (chemical purification) to generate salts with non-volatile properties that are easily soluble in the condensed water.

[0077] There can be various types of low-temperature condensation modules 1 in the purification device of this application, such as oil-immersed self-cooled low-temperature condensation, refrigerated low-temperature condensation, etc. As a preferred embodiment of this application, the low-temperature condensation module 1 adopts water-cooled low-temperature condensation. The purification device is provided with a cooling water inlet 103a and a cooling water return port 104a. The low-temperature condensation module 1 is connected to the cooling water inlet 103a and the cooling water return port 104a. The low-temperature condensation module 1 includes a cooling water pipe bundle 102 vertically arranged and arranged in an array in the flue gas purification channel, and an end joint assembly connected to the upper and lower ends of the cooling water pipe bundle 102. The end joint assembly and the cooling water pipe bundle 102 together form a cooling water circulation pipeline for the cooling water to flow from the cooling water inlet to the cooling water return port.

[0078] After the flue gas enters the flue gas purification channel from the flue gas inlet 4, it comes into full contact with the surface of the cooling water pipe bundle 102 through which the cooling water is flowing. The water vapor in the flue gas condenses into condensed water on the surface of the water pipes of the cooling water pipe bundle 102 and flows down along the surface of the cooling water pipes to the bottom of the purification device. Since the cooling water in this application is not in direct contact with the flue gas, the cooling water in the cooling water pipe bundle 102 is not contaminated and is continuously recycled after being cooled. Moreover, through calculation, the water consumption and consumption of the cooling water in the cooling water pipe bundle 102 are much smaller than the water consumption and consumption in the spray tower in the prior art, and the condensed water purified and recycled by this purification device can completely make up for the evaporated water volume during the cooling process of the cooling water.

[0079] Figure 1BThe working principle of the purification equipment of the present application is shown. The purification equipment of the present application can be used in conjunction with a water pump 9, a cooling water circulation pipeline, and a cooling tower. The water pump 9 provides driving force for the cooling water entering from the cooling water inlet 103a through the cooling water inlet pipeline 103 of the cooling water circulation pipeline. The cooling water flows in the cooling water circulation pipeline and then flows out from the cooling water outlet 104a into the cooling tower. The water in the cooling tower then flows back to the water pump 9 to achieve the cooling water circulation. The flue gas of the cement kiln enters the interior of the low-temperature condensation module 1 through the flue gas inlet 4 of the low-temperature condensation module 1 and exchanges heat fully with the cooling water pipe bundle 102. The cooling water pipe bundle 102 quickly cools the flue gas. Importantly, the cooling water pipe bundle 102 condenses the water vapor in the high-temperature flue gas into condensed water, and the condensed water adsorbs alkaline ammonia molecules (ammonia gas), cement raw material dust (calcium-containing), and acidic SO2 and CO2 and other gases contained in the flue gas. The alkaline ammonia molecules and cement raw material dust react with acidic SO2 and CO2 in the condensed water to form non-volatile salts such as ammonium bisulfate, ammonium bicarbonate, calcium sulfate, and calcium carbonate.

[0080] The purification equipment of the present application further includes a condensed water collection device 23, which is arranged at the bottom of the low-temperature condensation module 1. The condensed water collection device 23 is connected to the condensed water discharge port 10. The condensed water generated on the surface of the cooling water pipe bundle 102 flows down the surface of the pipe to the bottom of the purification equipment, and then is collected by the condensed water collection device 23. Finally, the condensed water discharge port 10 discharges the condensed water externally.

[0081] Furthermore, the externally discharged condensed water can be treated by membrane separation into reusable or externally discharged purified water (about 90%) and about 10% of high-salt concentrated water (salt dust content less than 3%). The high-salt concentrated water is pumped and sprayed onto the clinker grate cooler at the kiln head of the cement kiln. On the one hand, it can quickly cool the clinker. On the other hand, substances such as calcium sulfate and calcium carbonate in the water adhere to the surface of the clinker and are carried out to become part of the cement. The ammonium salts in the water are quickly heated and decomposed into ammonia and SO2 by the clinker and then enter the decomposition furnace of the cement kiln with the tertiary air. Among them, the ammonia molecules play a denitrification function in the decomposition furnace and are utilized, and SO2 reacts with CaO to form calcium sulfate and enters the clinker. The whole process has no secondary pollution, and all substances are recycled.

[0082] In the prior art known above, although it also discloses using a heat exchanger to cool the denitrified flue gas, the role of its heat exchanger in the above prior art is completely different from the role of the low-temperature condensation module 1 in the present application. The specific differences are as follows:

[0083] 1. Different inventive concepts

[0084] The above-mentioned prior art mainly removes ammonia by spraying absorbent through a spray tower, and the purpose of setting up the heat exchanger is to reduce the load of the spray tower; the present application creatively utilizes the characteristic that cement kiln flue gas contains water vapor, and cools and condenses the water vapor in the high-temperature flue gas into condensed water through the low-temperature condensation module 1. Ammonia and acidic gases such as SO2 and CO2 are easily dissolved in the condensed water under the low-temperature environment of the low-temperature condensation module 1 (physical process). At the same time, alkaline ammonia molecules react with acidic and alkaline substances in acidic SO2 and CO2 to form non-volatile substances such as ammonium bisulfate, ammonium bicarbonate, calcium sulfate and calcium carbonate (chemical process) and are discharged with the condensed water, so that the problem of ammonia escape in cement kilns is effectively solved; the present application directly undergoes a deamination reaction in the heat exchanger without the need to add any absorbent.

[0085] 2. The role played by the heat exchanger in the prior art is objectively different from that of the low-temperature condensation module 1 of the present application.

[0086] 1) Although the prior art records that the heat exchanger can cool the flue gas to 50 degrees, it does not disclose that deamination is performed in the heat exchanger. From the full text of the prior art, the heat exchanger has no deamination effect. This is because, based on the inventive concept, the denitrified flue gas after cooling by the heat exchanger enters the spray tower, and the spray tower absorbs ammonia by spraying absorbent. For designers, it is not intentional to divide the ammonia absorption into two steps, that is, ammonia absorption in the heat exchanger part and ammonia absorption in the subsequent spray tower, which will only increase the difficulty of ammonia recovery;

[0087] 2) Based on the inventive concept of the prior art, the heat exchanger does not need to play a deamination role, because deamination is still required by spraying absorbent. If the heat exchanger can achieve deamination, there is no need for spray tower treatment.

[0088] 3) It is very important that for traditional heat exchangers, the general goal is to avoid generating condensed water as much as possible during the heat exchange process, because condensed water will corrode the pipes of the heat exchanger over a long period of time, resulting in a reduction in the service life of the heat exchanger. Therefore, it can be concluded that the heat exchanger of the prior art is not intended to generate condensed water.

[0089] 3. The above-mentioned known prior art has many defects

[0090] 1) There is a risk of absorbent escape. The ammonia absorbent used is formic acid. The volatilization and escape of the absorbent also require further treatment, and formic acid is also a flammable substance;

[0091] 2) The amount of wastewater treated after the absorbent absorbs ammonia is large, and the treatment cost is high;

[0092] 3) Since the method of spraying the absorbent cannot fully utilize the absorbent, in order to improve the absorbent utilization rate, the absorbent has to be recycled. Not only does it require a long precipitation period, but the reflux pipeline for recycling will also suffer serious corrosion, making it difficult to implement the solution.

[0093] 4) It is difficult to detect whether the absorbent is saturated, and ineffective absorption is likely to occur, resulting in ammonia escape.

[0094] The purification equipment of the present application is different from the heat exchangers in the prior art. Since the applicable scenario of the purification equipment of the present application is limited to the purification of flue gas containing water vapor, ammonia, and acidic pollutants, and it aims to generate more condensed water during the cooling process to achieve the purification of physical and chemical processes, this is completely different from the concept of existing heat exchangers. In addition, the purification equipment of the present application realizes self-sustaining and one-step ammonia removal, with the advantages of simple ammonia removal process, small equipment volume, and low cost.

[0095] In addition, the purification equipment of the present application is not only applicable to ammonia removal. Since in the condensed water generated in the low-temperature condensation module 1, alkaline ammonia, cement raw material dust react with acidic substances such as SO2, CO2, and NOx in the flue gas to undergo neutralization reactions, the purification equipment of the present application can also be used for SO2 removal, CO2 removal, and NOx removal.

[0096] The cooling water pipe bundle 102 of the low-temperature condensation module 1 of the present application is arranged in a staggered tube bundle array. Specifically, as Figure 2B shown, the cooling water pipe bundle 102 includes multiple rows of cooling water pipes 102a arranged along the flue gas flow direction. Adjacent two rows of cooling water pipes 102a are staggered in the flue gas flow direction and there is no gap between their positive projection planes in the flue gas flow direction.

[0097] As a preferred embodiment of the present application, there is an intersection between the positive projection planes of adjacent two rows of cooling water pipes 102a in the multiple rows of cooling water pipes 102a in the flue gas flow direction. This setting method enables the flue gas entering the flue gas purification channel to move forward tortuously in the gaps of the cooling water pipe bundle 102, maximizing the heat exchange contact area between the flue gas and the cooling water pipe bundle 102, and ensuring the normal flow of the flue gas without affecting the purification treatment of the continuously newly entering flue gas.

[0098] As a deformation of the arrangement method of the cooling water pipe bundle 102, in other embodiments, the boundaries of the positive projection planes of adjacent two rows of cooling water pipes 102a in the multiple rows of cooling water pipes 102a coincide in the flue gas flow direction. That is, the maximum width dimension of a cooling water pipe 102a in the previous row is exactly equal to the gap width between two adjacent cooling water pipes 102a in the subsequent row. This setting method can also avoid the situation where some flue gas directly passes through the gap existing between adjacent two rows of cooling water pipes 102a in the front-back direction without contacting the surface of the cooling water pipes 102a for heat exchange.

[0099] In the present application, the cooling water pipe 102a can be in the shape of a circular pipe, an elliptical pipe, a rectangular pipe, a rhombic pipe, etc. However, considering how to minimize the resistance encountered by the flue gas in the cooling water pipe bundle 102 as much as possible, maximize the heat exchange contact area between the flue gas and the cooling water pipe bundle 102, and maximize the heat exchange efficiency between the cooling water pipe 102 and the flue gas, it is necessary to carry out refined design on the shape of the cooling water pipe 102.

[0100] For this reason, as a preferred embodiment of the present application, an arc rhombic cooling water pipe is proposed, as Figures 7A - 7C shown. The arc rhombic cooling water pipe includes: a cooling water pipe body 1020, the cross-section of the cooling water pipe body 1020 is in the shape of an arc rhombus, and the two ends of the short diagonal of the cross-section of the cooling water pipe body 1020 are respectively large arc ends 1020b, and the two ends of the long diagonal are respectively small arc ends 1020a;

[0101] The large arc ends 1020b at both ends of the short diagonal and the small arc ends 1020a at both ends of the long diagonal are respectively connected by straight edges 1020c, and the straight edges 1020c are tangent to the arc lines of the large arc ends 1020b.

[0102] As Figures 7A - 7C shown, the radius of curvature of the large arc end 1020b is much larger than that of the small arc end 1020a, that is, the curvature of the large arc end 1020b is much smaller than that of the small arc end 1020a. Since the curvature of the small arc end 1020a is large, it forms an acute angle together with the two straight edges 1020c.

[0103] The cooling water pipe body 1020 is in a long strip structure, and its interior is a hollow structure for the flow of cooling water. When the cooling water pipe 102a is applied to a low-temperature condensation device, the small arc ends 1020a of the cooling water pipe body 1020 are horizontally arranged along the flue gas inlet 4 to the flue gas outlet 5 direction, that is, horizontally arranged along the left-right direction of the low-temperature condensation device, and the midpoint connection line of the two large arc ends 1020b is perpendicular to the connection line of the two small arc ends 1020a, that is, the two large arc ends 1020b are horizontally arranged along the front-back direction of the low-temperature condensation device.

[0104] In the embodiment of the present application, the cooling water pipe body 1020 with a cross-section in the shape of an arc rhombus is defined as an arc rhombic pipe. Compared with the cooling water pipe with a circular, elliptical, rhombic, etc. cross-section, it can achieve a larger heat exchange contact area between the flue gas and the cooling water pipe and a smaller flue gas resistance. The specific analysis is as follows:

[0105] Comparison with a circular pipe:

[0106] The length of the short diagonal of the arc-rhombus tube is the same as the diameter of the original circular cooling water pipe, while the length of the long diagonal is greater than the diameter of the original circular cooling water pipe. This makes the surface area of the improved arc-rhombus tube at both ends larger than that of the original circular cooling water pipe, thereby increasing the contact area between the cooling water pipe and the cement kiln flue gas, that is, increasing the heat exchange area.

[0107] In addition, since the curvature radius of the small arc end 1020a of the cooling water pipe body 1020 is much smaller than that of the large arc end, that is, the two ends of the cooling water pipe body 1020 are acute angles with a smaller included angle. Compared with the shape of the two ends of the circular cooling water pipe, the arc-rhombus-shaped cooling water pipe body 1020 has a smaller wind resistance at both ends. Therefore, the arc-rhombus shape achieves resistance reduction compared to the circle.

[0108] Comparison with elliptical tubes:

[0109] The arc-rhombus tube has two differences compared with the elliptical tube. The first difference is that in the cooling water pipe body 1020 of the present application, the large arc end 1020b and the small arc end 1020a are connected by a straight edge 1020c, while the elliptical tube is connected by an arc edge. When two cooling water pipes 102a are arranged in a staggered manner, the flow space formed between the two elliptical tubes is a structure with a large middle and small ends, while the flow space formed between the two arc-rhombus tubes is more flat in size. Therefore, it is more conducive to the flow of the tail gas and can avoid the influence on the tail gas flow caused by the change of the flow space size.

[0110] The second difference is that in the present application, in order to form an arc-rhombus structure, when the size of the large arc end 1020b with a large curvature radius is unified, the curvature radius of the other small arc end 1020a is necessarily larger for the elliptical tube than for the arc-rhombus tube. Therefore, the arc-rhombus tube has a smaller wind resistance at both ends compared with the elliptical tube, and the technical effect of resistance reduction can also be achieved.

[0111] Comparison with conventional rhombus tubes:

[0112] Compared with the rhombus tube, the cross-sectional shape of the arc-rhombus tube is equivalent to replacing the upper and lower sharp corners of the rhombus tube cross-section with large arc ends 1020b with a small curvature, and replacing the left and right sharp corners with small arc ends with a large curvature. The upper and lower ends of the arc-rhombus tube are large arc ends 1020b. Compared with the upper and lower ends of the rhombus tube being obtuse ends, using an arc transition can make the flow of the flue gas more stable. In addition, replacing the left and right sharp corners with small arc ends with a large curvature can prevent the flue gas from separating at the rear end.

[0113] In addition, a diamond-shaped pipe with pointed corners at both the left and right ends will cause excessive deformation at both ends, making it prone to breakage. And due to structural limitations, the thickness at both ends of the diamond-shaped pipe is generally greater than that of other parts, resulting in an increased heat conduction path for the cooling water at both ends inside the diamond-shaped pipe, which will reduce the heat exchange efficiency. However, setting it into a small arc structure can make the thickness at both ends of the arc diamond-shaped pipe close to that of other parts, preventing the heat conduction path of the cooling water from increasing at both ends and thus not affecting the heat exchange efficiency.

[0114] This embodiment achieves the purpose of increasing the heat exchange area at both ends of the cooling water pipe body 1020, and using the large arc ends 1020b and small arc ends 1020a to reduce the resistance suffered when the cement kiln tail gas flows, enabling the smooth flow of the cement kiln tail gas. Thus, it realizes the technical effect of enhancing the contact area between the cement kiln tail gas and the cooling water pipe body 1020, enabling the smooth flow of the cement kiln tail gas, and improving the cooling efficiency of the cement kiln tail gas. Furthermore, it solves the problem in the related art that the cooling water pipe has a relatively small heat exchange area and a large resistance to the flow of the cement kiln tail gas, and cannot effectively improve the cooling efficiency of the cement kiln tail gas.

[0115] The midpoint connection line of the large arc ends 1020b at both ends of the short diagonal is perpendicular to the connection line of the small arc ends 1020a at both ends of the long diagonal.

[0116] Both the large arc ends 1020b and small arc ends 1020a include inner fillets and outer fillets. To avoid the problem of thickness change caused by the fillet setting at the upper and lower ends and left and right ends of the cooling water pipe body 1020, in this embodiment, the inner fillet and outer fillet of the large arc ends 1020b are concentrically arranged, and the inner fillet and outer fillet of the small arc ends 1020a are concentrically arranged.

[0117] Since the cross-sectional dimensions of the cooling water pipe body 1020 still have a great influence on the heat exchange efficiency, in order to rationally utilize space and improve the heat exchange efficiency, the applicable ranges of the dimensions of the cross-section of the cooling water pipe body 1020 in this embodiment are as follows:

[0118] A = 20 - 100 mm;

[0119] B = A - 2A;

[0120] R1 = 1 / 2 × A;

[0121] R2 = R1 - t;

[0122] r1 = 6 - 1 / 2 × R1;

[0123] r2 = r1 - t;

[0124] Wherein, A is the length of the short diagonal of the cooling water pipe body 1020; B is the length of the long diagonal of the cooling water pipe body 1020; R1 is the outer diameter of the large arc end 1020b; R2 is the inner diameter of the small arc end 1020a; t is the wall thickness of the cooling water pipe body 1020; r1 is the outer diameter of the small arc end 1020a; r2 is the inner diameter of the large arc end 1020b.

[0125] Since the cooling water pipe 102a in this application is an arc-shaped rhombus pipe, compared with a circular pipe, it is more difficult to install, it is difficult to ensure the sealing performance of its connection, and it is not convenient to connect with the inlet and return water pipelines. Therefore, the cooling water pipe 102a provided in this embodiment further includes an upper joint 22 and a lower joint 21 respectively arranged at both ends of the cooling water pipe body 1020; wherein, the upper joint 22 and the lower joint 21 have the same structure, and both include a plug 211 and a joint 213. The plug 211 is hermetically fixed at both ends of the cooling water pipe body 1020, and the first end of the joint 213 is hermetically fixed on the plug 211 and communicated with the inside of the cooling water pipe body 1020, and the second end extends out of the plug 211.

[0126] Specifically, it should be noted that the two ends of the cooling water pipe body 1020 are blocked by the plug 211. The cross-section of the plug 211 can be equal to or larger than the cross-section of the cooling water pipe body 1020, and the two ends of the cooling water pipe body 1020 are sealed through the plug 211. The plug 211 can provide an installation position for the joint 213, so that the joint 213 can be installed on the plug 211, and then the joint 213 is connected with the inlet and return water pipelines. The joint 213 can be set to a structure convenient for connection, such as circular. Through the setting of the plug 211 and the joint 213, the technical effect of improving the sealing performance of the cooling water pipe body 1020 and being convenient for connecting with the inlet and return water pipelines is achieved, and thus the problems in the related art that it is difficult to ensure the sealing performance of the connection of a non-circular cooling water pipe during installation and it is not convenient to connect with the inlet and return water pipelines, resulting in troublesome installation, are solved.

[0127] Furthermore, the cross-section of the plug 211 is set to the same arc-shaped rhombus shape as the cross-section of the cooling water pipe body 1020. An adapter installation hole is axially formed in the plug 211, and the adapter installation hole is communicated with the inside of the cooling water pipe; the first end of the joint 213 is hermetically fixed in the adapter installation hole.

[0128] To improve the sealing performance between the joint 213 and the adapter installation hole, the first end of the joint 213 is threadedly connected to the adapter installation hole, and thread sealant can be injected to improve the sealing performance. To facilitate the connection between the joint 213 and external equipment, an internal thread or an external thread is further provided at the end of the joint 213 away from the plug 211.

[0129] An annular groove is provided in the joint mounting hole, and a sealing ring 212 is embedded in the annular groove. The joint 213 is threadedly connected to the joint mounting hole and presses the sealing ring 212 tightly in the annular groove, thereby improving the sealing performance between the joint 213 and the joint mounting hole.

[0130] In this application, as Figure 8 shown, the adjacent two rows of the cooling water pipe bodies 1020 and the three adjacent cooling water pipe bodies 1020 form a cooling water pipe unit arranged in a triangular pattern. The layout dimension range of the cooling water pipe unit is:

[0131] C = 1.8A~2A;

[0132] D = 0.8B~1.5B;

[0133] wherein, A is the maximum width dimension of the pipe cross-section; B is the maximum length dimension of the pipe cross-section; C is the center distance dimension of the pipe cross-sections of two adjacent cooling water pipe bodies 1020 in the same row; D is the center distance dimension of the pipe cross-sections of the cooling water pipe bodies 1020 in adjacent rows.

[0134] When the cooling water pipe 102a is an arc rhombus pipe, A is the maximum width of the short diagonal of the arc rhombus pipe; B is the maximum length of the long diagonal of the arc rhombus pipe; C is the center distance between two adjacent arc rhombus pipes in the same row; D is the horizontal center distance between two arc rhombus pipes in adjacent rows.

[0135] Figure 13 A simplified diagram of the convective heat transfer of the low-temperature condensation module of this application is shown. In the figure, s1 is the row pitch of the staggered tube bundle, and s2 is the column pitch of the staggered tube bundle.

[0136] The heat transfer on the flue gas side of the low-temperature condensation module of this application is that the fluid flows across the staggered tube bundle, and its surface average heat transfer coefficient h The relationship with the dimensionless heat transfer coefficient Nu is:

[0137] ;

[0138] where l is the characteristic length, is the thermal conductivity of the fluid.

[0139] For the flue gas heat transfer conditions studied, the Reynolds number range of its flow is approximately Re = 10 3 ~2×10 5 , Nu can be expressed as:

[0140] ;

[0141] where s1 is the row pitch of the staggered tube bundle, and s2 is the column pitch of the staggered tube bundle. Re f is the Reynolds number of the flue gas flow, Pr fis the Prandtl number of the flue gas, Pr w is the Prandtl number of the flue gas with the wall temperature as the characteristic temperature.

[0142] In engineering calculations, if the logarithmic mean temperature difference of convective heat transfer is given as , then according to the heat transfer equation, the overall heat transfer amount is:

[0143] ;

[0144] Among them, k is the comprehensive heat transfer coefficient, and A is the heat transfer area.

[0145] As can be seen from the above analysis, the heat transfer area of the arc rhombus tube is larger than that of the circular tube. Therefore, using the arc rhombus tube as the cooling water pipe 102a in this application can increase the overall heat transfer amount of the equipment.

[0146] Using the arc rhombus tube will also affect the flow resistance of the flue gas. The circular tube and the preferred arc rhombus tube of this application will be compared and analyzed below.

[0147] The flow resistance relationship formula for the circular tube in staggered arrangement is:

[0148] When the gas flows around the tube bundle, the flow resistance is a function of the fluid velocity, the tube bundle arrangement, the fluid physical properties, and the number of rows. Its correlation formula is

[0149] ;

[0150] Among them, is the correction coefficient for the staggered tube bundle, which is the relationship formula of the pipeline parameters s1 and s2, is the number of rows of the pipeline, f is the resistance coefficient, f is a value that depends on the change of the flow Reynolds number Re.

[0151] The flow resistance relationship formula for the arc rhombus tube in staggered arrangement is:

[0152] The long side of the arc rhombus tube is l 1, and the short side is l 2. With the design correction coefficient ε, the flow resistance relationship formula for the arc rhombus tube in staggered arrangement is:

[0153] ;

[0154] Among them, is the correction coefficient related to the side length of the arc rhombus tube compared with the circular tube in staggered tube bundle, is greater than 1. The meanings of the remaining parameters are the same as those in the above formula.

[0155] The edges of the arc rhombus are similar to the streamlined properties of the airfoil. Compared with the circular pipe, the separation area of the flow boundary layer at the tail is reduced, and the adverse pressure gradient is decreased. Therefore, the overall resistance will be reduced.

[0156] As Figures 3A - 3B shown, the box structure of the purification device of the present application preferably adopts a rectangular box structure. Specifically, the box 101 includes an upper box plate 1011, a lower box plate 1012, a front box plate 1013, and a rear box plate 1014. The upper box plate 1011, the front box plate 1013, the lower box plate 1012, and the rear box plate 1014 are hermetically connected in sequence. The left and right sides of the box 101 are open to form a flue gas inlet 4 and a flue gas outlet 5 for the flue gas to flow through, and a flue gas passage from the flue gas inlet 4 to the flue gas outlet 5. The flue gas passage is used to accommodate the vertically arranged and arrayed cooling water pipe bundles 102. A plurality of pipe installation holes 102b for hermetically assembling the ends of the cooling water pipes 102a are opened on the upper box plate 1011 and the lower box plate 1012. Spaces for assembling the end joint components for connecting the upper and lower ends of the cooling water pipe bundles 102 are left above the upper box plate 1011 and below the lower box plate 1012. However, the present application does not limit that the box structure must be a rectangular structure. Those skilled in the art should understand that in some special application scenarios, the box structure can be appropriately deformed, such as an arc-shaped box structure with a certain curvature, or a trapezoidal box structure with different sizes of flue gas inlets and flue gas outlets.

[0157] In the present application, the upper and lower ends of the cooling water pipe bundles 102 are installed on the upper box plate 1011 and the lower box plate 1012. Considering that the purification device needs to operate for a long time, when the low-temperature condensation module 1 works, the cooling water pipes 102a will be frequently vibrated by the impact of the flue gas, which is likely to cause the problem of flue gas leakage at the joints between the upper and lower ends of the cooling water pipes 102a and the upper and lower box plates. To solve this problem, as Figures 9A to 10B shown, the present application proposes a sealed installation structure for the cooling water pipe and the box plate. The sealed installation structure includes an installation base 20 and a cooling water pipe body 1020. Among them,

[0158] a pipe installation hole 102b is opened on the installation base 20, and an annular groove 17 is opened along the circumferential direction of the hole wall of the pipe installation hole 102b. In this embodiment, the installation base 20 is the upper box plate 1011 and the lower box plate 1012 of the box 101.

[0159] The end of the cooling water pipe body 1020 is arranged in the pipe installation hole 102b. A part of the cooling water pipe body 1020 corresponding to the annular groove 17 is provided with an annular protrusion 18, and the annular protrusion 18 is hermetically embedded in the annular groove 17 so that the end of the cooling water pipe body 1020 and the pipe installation hole 102b form a curved surface seal.

[0160] In this embodiment, the cooling water pipe body 1020 has a long strip structure and is hollow inside, which can be used for the flow of cooling water. The installation base 20 is the upper box plate 1011 or the lower box plate 1012 of this application. In the prior art, in order to improve the sealing performance between the cooling water pipe body 1020 and the installation base 20, generally a sealing ring is fixed on the installation base 20, and the cooling water pipe body 1020 is fixed inside the sealing ring, and the sealing ring is used to improve the sealing performance at the connection between the cooling water pipe body 1020 and the installation base 20.

[0161] However, since the outer side of the cooling water pipe body 1020 is still a straight curved surface structure, and the corresponding positions of the sealing ring and the installation base 20 are also straight curved surface structures, when the cooling water pipe body 1020 is installed on the sealing ring and the installation base 20, it is still difficult for the straight curved surface structure to maintain the sealing performance for a long time, resulting in an unsatisfactory sealing effect.

[0162] Therefore, to solve this problem, as Figure 9B and 10B shown, in this embodiment, a water pipe installation hole 102b is opened on the installation base 20, and an annular groove 17 is opened in the water pipe installation hole 102b. The end of the cooling water pipe body 1020 is sleeved in the water pipe installation hole 102b. To make the cooling water pipe body 1020 fit with the annular groove 17, an annular protrusion 18 can be provided on the outer side of the cooling water pipe body 1020, and the annular protrusion 18 is hermetically embedded in the annular groove 17, so that a curved surface seal is formed between the annular protrusion 18 and the annular groove 17.

[0163] Due to the setting of the annular groove 17, the inner surface of the water pipe installation hole 102b on the installation base 20 is changed from a straight curved surface structure to a zigzag curved surface structure, and the outer surface of the end of the cooling water pipe body 1020 is changed from a straight curved surface structure to a zigzag curved surface structure. It can be understood that when the cooling water pipe body 1020 is installed in the water pipe installation hole 102b, the connection between the cooling water pipe body 1020 and the water pipe installation hole 102b is also changed from a straight curved surface structure to a zigzag curved surface structure, thereby improving the sealing performance at the connection between the cooling water pipe body 1020 and the water pipe installation hole 102b. And an interference fit can be adopted between the annular protrusion 18 and the annular groove 17 to further improve the sealing performance.

[0164] This embodiment realizes the technical effect of improving the sealing performance between the cooling water pipe body 1020 and the installation base 20 and preventing the tail gas from leaking from the connection between the two, and further solves the problem that in the related art, only sealant 16 or a sealing ring is generally used for sealing between the cooling water pipe and the installation base 20, and the sealing performance still hardly meets the use requirements.

[0165] As Figure 9B and10B As shown, the annular groove 17 in the water pipe installation hole 102b can be formed by grooving with a special tooling. The width of the cross-section of the annular groove 17 can gradually decrease from the inside to the outside, so as to form a small arc end structure with a smaller diameter at its outermost end. Compared with a rectangular groove or a groove structure of other shapes, the structure of the annular groove 17 has better sealing performance when the annular protrusion 18 cooperates with it. The annular protrusion 18 on the cooling water pipe body 1020 can be realized by expanding the pipe. Specifically, the cooling water pipe body 1020 can be sleeved in the water pipe installation hole where the annular groove 17 has been opened. Through a special pipe expanding tooling, an outward expanding pressure is applied to the corresponding part of the cooling water pipe body 1020 and the annular groove 17, so that the cooling water pipe body 1020 deforms at the corresponding part, forms the first annular protrusion 18 and is pressed and fixed in the annular groove 17.

[0166] To further improve the sealing performance at the connection between the cooling water pipe body 1020 and the installation base 20, a sealant 16 is provided in the annular groove 17. The sealant 16 can be applied in the annular groove 17 before installing the cooling water pipe body 1020. When the cooling water pipe body 1020 is expanded to form the annular protrusion 18 and is embedded in the annular groove 17, the sealing performance is improved under the action of the sealant 16.

[0167] To improve the uniformity of the opening depth of the annular groove 17, the annular groove 17 is coaxially arranged with the water pipe installation hole.

[0168] As Figure 9B and 10B shown, a rubber gasket 15 is also provided in the annular groove 17, and the annular protrusion 18 presses the rubber gasket 15 tightly in the annular groove 17. The shape of the rubber gasket 15 matches the shape of the annular groove 17. The rubber gasket 15 can be first embedded in the annular groove 17, then the sealant 16 is injected into the annular groove 17, and finally the cooling water pipe body 1020 is sleeved in the water pipe installation hole 102b.

[0169] The annular groove 17 includes a plurality of grooves arranged at intervals circumferentially along the inner wall of the water pipe installation hole 102b, and the extension depths of the plurality of grooves on the inner wall are the same or different. The plurality of grooves can increase the contact points between the cooling water pipe body 1020 and the inner wall of the water pipe installation hole 102b. When the extension depths of the plurality of grooves are different, the sealing performance between different contact points can be different, and the depth of the grooves can be adjusted according to the actual exhaust gas flow situation to improve the scope of use.

[0170] To further improve the sealing performance at the connection between the cooling water pipe body 1020 and the installation base 20, the annular groove 17 is provided in multiple and distributed along the axial direction of the water pipe installation hole 102b, so as to form a multi-stage seal, and the sealing method of each stage is the same.

[0171] To further improve the sealing performance, as Figure 10B shown, in this embodiment, two annular grooves 17 are provided, including a first annular groove 171 and a second annular groove 172. The groove opening direction of the first annular groove 171 and the groove opening direction of the second annular groove 172 are inclined in opposite directions along the axial direction of the water pipe installation hole; correspondingly, the annular protrusion 18 includes a first annular protrusion 18 and a second annular protrusion 18, and the protrusion directions of the first annular protrusion 18 and the second annular protrusion 18 are inclined in opposite directions along the axial direction of the water pipe installation hole.

[0172] Specifically, it should be noted that the first annular groove 171 and the second annular groove 172 are arranged in sequence from inside to outside. The groove opening direction of the first annular groove 171 can be inclined towards the inside of the installation base 20, while the groove opening direction of the second annular groove 172 can be inclined towards the outside of the installation base 20, so that the connection between the cooling water pipe body 1020 and the water pipe installation hole 102b is sealed in different directions.

[0173] Moreover, in this embodiment, the depth of the second annular groove 172 is greater than the depth of the first annular groove 171. Through this setting method, the second annular groove 172 forms a secondary seal with better sealing performance, further improving the sealing performance of the overall connection.

[0174] After the annular groove 17 and the annular groove 17 in the water pipe installation hole 102b are matched, the sealing performance of the part in the water pipe installation hole 102b is effectively improved. However, the parts at both ends of the water pipe installation hole 102b are still straight curved surface structures, and their sealing performance still needs to be improved. Therefore, as Figure 10B shown, in this embodiment, two annular clamping protrusions 19 are further provided on the cooling water pipe body 1020. The two annular clamping protrusions 19 are located on the inner side and the outer side of the installation base 20, that is, at both ends of the water pipe installation hole 102b. The opposite surfaces of the two annular clamping protrusions 19 are respectively abutted against the inner side surface and the outer side surface of the installation base 20. The two annular clamping protrusions 19 are respectively used to form the first seal and the last seal at the connection between the cooling water pipe body 1020 and the installation base 20, which can further enhance the sealing performance and also improve the connection strength between the cooling water pipe body 1020 and the installation base 20.

[0175] As a preferred embodiment of the present application, the water pipe installation hole 102b is an arc-rhombus hole that is consistent with the cross-sectional contour and dimensions of the end of the arc-rhombus pipe. The annular groove 17 includes a plurality of grooves that are arranged in sequence on the four straight sides 1020c and the two large arc ends 1020b of the arc-rhombus hole. Correspondingly, the annular protrusion 18 includes a plurality of protrusions that are arranged on the four straight sides 1020c and the two large arc ends 1020b of the end of the arc-rhombus pipe. The plurality of grooves and the plurality of protrusions are in a fitting and sealing cooperation. By combining the fitting depths of different grooves and protrusions and with the special-shaped arc-rhombus shape, the sealing performance at the connection between the cooling water pipe 102a and the installation base 20 (the upper box plate 1011 and the lower box plate 1012) can meet the requirement that the purification equipment can work for a long time without flue gas leakage.

[0176] In the present application, the structural form of the end joint assembly will affect the flow form of the cooling water from the cooling water inlet 103a to the cooling water return port 104a. Five embodiments of the low-temperature condensation module 1 with different end joint assemblies are proposed in the present application.

[0177] Figures 2C - 2E An embodiment of the low-temperature condensation module with a circular pipe elbow as the end joint is shown. As can be seen from the figure, the end joint assembly is a circular pipe elbow assembly that sequentially connects the ends of two adjacent cooling water pipes 102a. Along the direction from the flue gas inlet 4 to the flue gas outlet 5, the ends of two adjacent rows of cooling water pipes 102 are connected by a circular pipe elbow 105 located outside the box plate.

[0178] In this embodiment, the cooling water circulation pipeline is arranged above the box body 101 of the low-temperature condensation module 1. In other embodiments, it can also be arranged below, and the specific position is set according to actual needs. The cooling water circulation pipeline is set in two groups. The cooling water pipe bundle 102 is divided into two front and rear cooling water pipe areas 24 along the flue gas inlet 4 to the outlet direction in the box body 101. The cooling water inlet pipeline 103 and the cooling water return pipeline 104 of the two groups of cooling water circulation pipelines are respectively communicated with the inlet cooling water pipeline and the outlet cooling water pipeline of the front and rear two cooling water pipe areas 24. Since the temperature of the flue gas near the flue gas inlet 4 is high, a large cooling temperature drop of the cooling water pipe 102a near the flue gas inlet 4 is required. On the basis of the cooling of the cooling water pipe 102a on the front side, the requirement for the cooling temperature drop of the cooling water pipe 102a near the flue gas outlet 5 is small. Therefore, in this embodiment, the cooling water flow rate in the cooling water pipe area 24 near the outlet side can be reduced, which can save the amount of cooling water used. Specifically, the way to reduce the cooling water flow rate in the cooling water pipe area 24 near the outlet side can be to reduce the pipe diameter (i.e., the cross-sectional area size) of the cooling water pipe 102a or to reduce the inlet flow rate of the cooling water inlet pipeline 103. In other embodiments, the cooling water flow rate in the cooling water pipe area 24 on the outlet side may not be reduced, that is, the amount of cooling water used in the cooling water pipe area 24 on the inlet side is the same as the flow rate in the cooling water pipe area 24 on the outlet side. In addition, it should be noted that the present application does not limit the number of the cooling water pipe areas 24. In other embodiments, it can also be set to three, four, five, etc. according to actual needs.

[0179] In the above embodiment, since the number of the cooling water pipes 102 is large, the same number of round pipe elbows 105 are required. However, a large number of round pipe elbows 105 will cause kinetic energy resistance loss of the cooling water at the turning points, reducing the heat exchange efficiency of the low-temperature condensation module 1. At the same time, in order to reduce the overall volume of the low-temperature condensation module 1, the arrangement spacing of the cooling water pipes 102 is small. To connect the ends of two cooling water pipes 102 with the round pipe elbow 105, the radian of the round pipe elbow 105 is small, and the processing difficulty is large.

[0180] To solve the problems of large kinetic energy resistance loss of the cooling water at the round pipe elbow 105 and large processing difficulty of the round pipe elbow 105, as Figures 3A - 6D shown in the embodiment of using a water tank to replace the round pipe elbow 105 as the end joint assembly.

[0181] Specifically, the end joint assembly includes an upper end joint assembly 25 and a lower end joint assembly 26. The upper end joint assembly 25 and the lower end joint assembly 26 are alternately arranged above and below the cooling water pipe bundle 102 in the flue gas flow direction, and each end joint penetrates the ends of multiple rows of cooling water pipes 102a to form a parallel pipeline in the cooling water pipe bundle 102 for at least two rows of parallel water flows to flow in the same direction. Specifically, the upper end assembly 25 is an upper water tank 11, and the lower end assembly 26 is a lower water tank 12. The upper water tank 11 includes a plurality of upper water tank sub-parts 111 arranged in the flue gas flow direction above the cooling water pipe bundle 102 as the end joints. The lower water tank 12 includes a plurality of lower water tank sub-parts 121 arranged in the flue gas flow direction below the cooling water pipe bundle 102 as the end joints. The multiple rows of cooling water pipes 102a penetrated by each water tank sub-part include an inlet water pipeline and an outlet water pipeline arranged side by side in the flue gas flow direction, and the number of rows of the inlet water pipeline and the outlet water pipeline is the same.

[0182] Figures 3A - 3D An embodiment showing the circulation of cooling water along the grouped water pipes is illustrated. In this embodiment, water tanks are provided on the outer sides of the upper and lower box plates of the box body 101 to replace the round pipe elbows 105 in Embodiment 1 to achieve the connection of the ends of the cooling water pipes 102. An upper water tank 11 is provided above the upper box plate 1011, and a lower water tank 12 is provided below the lower box plate 1012. A number of partition plates are provided in the upper water tank 11 to divide the upper water tank 11 into the 1st to the Nth upper water tank sub-parts 111, and a number of partition plates are provided in the lower water tank 12 to divide the lower water tank 12 into the 1st to the Nth lower water tank sub-parts 121. Each upper water tank sub-part 111 or lower water tank sub-part 121 correspondingly connects the ends of at least two rows of cooling water pipes 102. The cooling water inlet pipeline 103 is connected to the 1st lower water tank sub-part 121 close to the flue gas inlet 4, and the cooling water return pipeline 104 is connected to the Nth upper water tank sub-part 111 farthest from the flue gas inlet 4. The 2nd to the Nth lower water tank sub-parts 121 of the lower water tank 121 are respectively arranged in an interleaved manner with the 1st to the (N - 1)th upper water tank sub-parts 111 of the upper water tank 111. Specifically, as Figure 3AAs shown in the figure, the cooling water enters the first lower water tank section 121 of the lower water tank from the cooling water inlet. The first lower water tank section 121 corresponds to 4 rows of cooling water pipes 102a. Driven by the pressure of the water pump 9, the cooling water flows upward along these 4 rows of cooling water pipes 102a and flows out from the first 4 rows of cooling water pipes 102a of the first upper water tank section 111. As can be seen from the figure, the first upper water tank section 111 corresponds to and is connected to 8 rows of cooling water pipes 102a. The cooling water flowing in from the first 4 rows turns after passing through the first upper water tank section 111 and then flows downward into the last 4 rows of cooling water pipes 102a. The second lower water tank section 121 corresponds to and is connected to 8 rows of cooling water pipes 102a. The cooling water in the 4 rows of cooling water pipes 102a flowing down from the first upper water tank section 111 turns after passing through the second lower water tank section 121 and then flows upward out from the last 4 rows of cooling water pipes 102a. The second to N-1 upper water tank sections 111 and the third to Nth lower water tank sections 121 are arranged in sequence according to the above rules. The cooling water circulates in sequence in the lower water tank section 121, the cooling water pipes 102a, and the upper water tank section 111, and finally flows out from the cooling water return port on the Nth upper water tank section 11 of the upper water tank 11.

[0183] In this embodiment, the water tank section replaces the circular pipe elbow in the above embodiment, enabling the cooling water routing to change from 1-way turning in the above embodiment to multi-way turning, reducing the number of turns, also reducing the resistance loss of the cooling water turning, and improving the heat exchange efficiency of the cooling water pipe bundle; secondly, the water tank also reduces the processing difficulty and processing cost compared with the circular pipe elbow.

[0184] Regarding the flow resistance of water, since it flows inside the pipe, its flow resistance consists of the frictional resistance along the straight pipe section and the local resistances such as those flowing through elbows, joints, and sudden changes.

[0185] The frictional resistance is expressed as: ,

[0186] where is the frictional resistance coefficient, l is the pipe length, d is the inner diameter of the pipe, is the flow velocity inside the pipe, g is the acceleration due to gravity;

[0187] The local resistance is expressed as: ,

[0188] where is the local resistance coefficient, and N is the number of local resistance components.

[0189] From the above two formulas, the longer the pipe length l , the greater it is, and the greater N is, The greater it is. When changing from the elbow form to the integral water tank, the distance of the water flow from one side to the other side is greatly reduced, and the flow resistance is only composed of a small section of frictional resistance and two local resistances. Since the tube bundle array changes from a series arrangement to a parallel arrangement, at this time, the flow resistances of each channel are the same and are greatly reduced.

[0190] It should be noted that the water tank subsections in this application can also be independently arranged, that is, the water tank subsections are independently formed, and the water tank subsections can be fixed to each other through a fixing structure. In addition, the shape of the water tank subsection is not limited to the rectangular shape in the embodiments of this application. In other embodiments, in order to further reduce the resistance loss of the cooling water turning, the outer right angle of the rectangular water tank subsection can also be processed into a rounded corner.

[0191] Considering that the flue gas temperature is high near the flue gas inlet 4 and the cooling water consumption is large, while the flue gas temperature is low far from the flue gas inlet 4 and the cooling water consumption is small. In order to further reduce the cooling water consumption, as the best embodiment of the low-temperature condensation module 1 of this application, Figures 4A - 4C An embodiment is shown in which the cooling water in each straight-through area circulates along the grouped water pipes and the cooling water volume is adjustable. Based on the above embodiment in which the cooling water circulates along the grouped water pipes, the cooling water pipes 102 are divided into the 1st to the Nth areas, and a set of cooling water inlets 103a and cooling water outlets 104a are correspondingly arranged for each area of the cooling water pipes 102. A plurality of cooling water pipe areas are isolated from each other and the cooling water circulates independently. This application achieves the purpose of saving the overall water consumption of the low-temperature condensation module 1 by reducing the water inflow of the cooling water pipe area far from the flue gas inlet 4 side. Specifically, in this embodiment, the cooling water pipes 102 are divided into three areas, and the cooling water consumption of the 1st area to the 3rd area is set to decrease in sequence. The number of areas for dividing the cooling water pipes 102 in this application is not limited. In other embodiments, according to actual needs, the cooling water pipes 102 can be set to two areas, four areas, five areas, etc. Correspondingly, the cooling water inlets 103a and the cooling water outlets 104a are also set to two groups, four groups, five groups, etc.

[0192] Furthermore, in the embodiments of this application, the method for sequentially reducing the cooling water consumption on the side far from the flue gas inlet 4 is as follows: by setting a flow regulating valve 1031 at the cooling water inlet 103a of the first lower water tank subsection 121 in each cooling water pipe area, the cooling water consumption of each cooling water pipe area can be adjusted by adjusting the inlet area of the flow regulating valve 1031. Specifically, a water distribution pipe 1033 communicating with the first lower water tank subsection 121 is provided on the first lower water tank subsection 121 in each cooling water pipe area, and a flow regulating valve 1031 is provided on the water distribution pipe 1033.

[0193] Furthermore, a main cooling water inlet pipe 1032 is provided below the lower water tank 12 in each cooling water pipe area and is respectively communicated with each branch water pipe 1033. Cooling water enters from the main cooling water inlet pipe 1032. The main cooling water inlet pipe 1032 distributes the cooling water into each branch water pipe 1033 according to the opening sizes of the respective flow regulating valves 1031. In the embodiment of the present application, in order to save the overall water consumption of the cooling water, the openings of the flow regulating valves 1031 far from the flue gas inlet 4 are gradually reduced. In this way, the amount of cooling water distributed by the main cooling water inlet pipe to the branch water pipes 1033 far from the flue gas inlet 4 is gradually reduced, reducing the overall water consumption of the cooling water on the basis of meeting the condensation efficiency of the low-temperature condensation module 1.

[0194] As an alternative embodiment of the low-temperature condensation module 1 of the present application, the upper end component is an upper water tank that penetrates the upper ends of all the cooling water pipes, and the lower end component is a lower water tank. The lower water tank includes a plurality of lower water tank sub-parts arranged along the flue gas flow direction. Each lower water tank sub-part penetrates multiple rows of the cooling water pipes; the upper water tank is communicated with a cooling water return port, and each lower water tank sub-part is communicated with a cooling water inlet. It further includes a main cooling water inlet pipe, and the main cooling water inlet pipe is communicated with each cooling water inlet through a flow regulating valve. Specifically, as Figures 5A - 5C shown in the straight-through type adjustable cooling water embodiment for each area, a plurality of partition plates are provided in the lower water tank 12 to divide the lower water tank 12 into a plurality of lower water tank sub-parts 121. The number of cooling water pipes 102a corresponding to each group of lower water tank sub-parts 121 can be the same or different, which is specifically set according to actual needs. There are no partition plates in the upper water tank 11, and the upper water tank is a return water tank that covers and communicates with the 1st to Nth rows of cooling water pipes 102.

[0195] The cooling water enters from the main cooling water inlet pipe 1032 and is distributed to the corresponding lower water tank sub-parts 121 through the flow regulating valves 1031 of each branch water pipe 1033. In this embodiment, each lower water tank sub-part 121 is an inlet water tank. The cooling water flows from each sub-part upward along the cooling water pipe 102a into the upper water tank 11, and finally flows out from the cooling water return port 104a provided at the Nth row of cooling water pipes 102a.

[0196] Furthermore, considering that the flue gas temperature is high and the cooling water consumption is large near the flue gas inlet 4, and the flue gas temperature is low and the cooling water consumption is small far from the flue gas inlet 4, in order to further reduce the cooling water consumption of the low-temperature condensation module 1 in the embodiment of the present application, the cooling water amount of the sub-parts far from the flue gas inlet 4 side is set to be less than that of the sub-parts near the flue gas inlet 4 side. Specifically, along the direction from the flue gas inlet 4 to the outlet, the openings of the flow regulating valves 1031 of the branch water pipes 1033 of each sub-part are gradually reduced.

[0197] As a replaceable embodiment of the low-temperature condensation module 1 of the present application, the upper-end component 25 is an upper water tank 11 that penetrates through the upper ends of all the cooling water pipes 102a, and the lower-end component 26 is a lower water tank 12 that penetrates through the lower ends of all the cooling water pipes 102a. One of the upper water tank 11 and the lower water tank 12 is connected to the cooling water inlet 103a, and the other is connected to the cooling water return port 104a. Specifically, as shown in Figures 6A - 6D the embodiment where the cooling water in each straight-through zone circulates along the grouped water pipes and the cooling water volume is adjustable, there is no partition in the upper water tank 11, and the upper water tank 11 is a return water tank connected to the cooling water return port 104a; there is no partition in the lower water tank 12, and the lower water tank 12 is a water inlet tank connected to the cooling water inlet 103a. Both the upper water tank 11 and the lower water tank 12 cover and are connected to the 1st to Nth rows of cooling water pipes 102a. The cooling water enters the lower water tank 12 from the cooling water inlet 103a, then flows upward from each row of cooling water to the upper water tank 11, and finally flows out from the cooling water return port 104a provided at the Nth row of cooling water pipes 102a.

[0198] Furthermore, considering that the flue gas temperature is high near the flue gas inlet 4 and the cooling water consumption is large, while the flue gas temperature is low far from the flue gas inlet 4 and the cooling water consumption is small. In order to further reduce the cooling water consumption of the low-temperature condensation module 1 in the embodiment of the present application, along the direction from the flue gas inlet 4 to the outlet, the opening sizes of the connections between the lower water tank 12 and each row of cooling water pipes 102a are gradually reduced, so that the cooling water volumes of each row of cooling water pipes 102a from the flue gas inlet 4 to the outlet direction are gradually reduced, thereby realizing the overall water consumption of the low-temperature condensation module 1.

[0199] In addition, as shown in Figure 3C 、 4C 、5C, and 6C, the cooling water inlet 103a and the cooling water return port 104a are both arranged on opposite sides, so that the travel distances and resistances of the cooling water in each parallel-flow branch water pipe 1033 are the same, to ensure that the water flow rates in each parallel branch water pipe 1033 are the same and their cooling efficiencies for the corresponding flue gas are the same.

[0200] In addition, in order to ensure the overall aesthetic appearance of the purification equipment in the present application, a closed grille cover is installed on the outer side of the lower box plate 1012 to cover the water tank or elbow 105 exposed at the bottom of the box body 101.

[0201] The embodiment of the present application also provides a low-temperature condensation module 1 with a demisting, water collecting, and water blocking plate structure.

[0202] The flue gas velocity of the flue gas discharged from the cement kiln is high, and the heat exchange and condensation time through the low-temperature condensation module 1 is short. If the ammonia-containing condensate in the flue gas does not completely flow along the cooling water pipe 102a to the bottom of the device for external discharge, the ammonia-containing condensate will be discharged to the outside from the flue gas outlet 5, causing pollution. Therefore, in this embodiment, a demisting, water-collecting and water-blocking plate 13 is arranged at the flue gas outlet to further collect the moisture in the flue gas cooled to the dew point.

[0203] In order to further ensure that the ammonia-containing condensate will not be discharged to the outside from the flue gas outlet 5, in the embodiment of the present application, as Figure 3A shown, a plurality of vertically arranged demisting, water-collecting and water-blocking plates 13 are arranged at the flue gas outlet 5. The plate surface of the demisting, water-collecting and water-blocking plate 13 is a folding plate with a plurality of folding angles. After the flue gas is discharged from the last row of cooling water pipes 102a, it will pass through the demisting, water-collecting and water-blocking plate 13. Under the action of the folding surface of the folding plate, the velocity of the flue gas will decrease, and the condensate in the flue gas will adhere to the surface of the demisting, water-collecting and water-blocking plate 13 and flow down along the surface of the demisting, water-collecting and water-blocking plate 13 to the bottom of the device. By arranging the demisting, water-collecting and water-blocking plate 13, the condensate in the flue gas can be blocked from being discharged to the outside from the flue gas port.

[0204] Furthermore, the folding plate at least includes a pair of folding angles bent in opposite directions. In this way, the travel distance of the flue gas on the folding plate can be increased, which is beneficial to the collection of the moisture mixed in the flue gas.

[0205] As a preferred embodiment, a straight plate section is provided at a section of the folding plate close to the flue gas outlet, and its function is to guide the flue gas to flow along the demisting, water-collecting and water-blocking plate 13. Furthermore, at least part of the demisting, water-collecting and water-blocking plate 13 is formed with oblong holes extending vertically along the surface of the demisting, water-collecting and water-blocking plate 13 as drainage holes. The condensate adhering to the surface of the demisting, water-collecting and water-blocking plate 13 will flow down along the oblong holes to the bottom of the device for external discharge. Preferably, the oblong holes extend from the upper end to the lower end of the folding plate.

[0206] In order to further improve the safety of flue gas discharge, a wire mesh 14 is arranged outside the demisting, water-collecting and water-blocking plate 13 to provide a final barrier to the condensate in the flue gas.

[0207] In summary, the self-sustaining one-step purification equipment provided by the present application is applied to flue gas purification treatment scenarios such as cement kilns, power plants or coal yards, and can effectively reduce the contents of escaped ammonia, SO2, NOx, CO2 and dust content in the discharged flue gas.

[0208] In an embodiment of the purification equipment of the present application, when the flue gas temperature at the flue gas inlet is 105 °C, the moisture content of the flue gas is 9.5%, the escaped ammonia is 20 mg / m 3 , the SO2 content is 15 mg / m 3 , and the NOx content is 38 mg / m 3, CO2 concentration 20.5%, dust content 6 mg / m 3 , when the inlet water temperature of the cooling water is 28 °C,

[0209] (1) The flue gas outlet temperature is 60 °C, the moisture content of the flue gas is 6.5%, the escaped ammonia is 6 mg / m 3 , SO2 content 5 mg / m 3 , NOx content 34 mg / m 3 , CO2 concentration 18.5%, dust content 3 mg / m 3 , the outlet water temperature of the cooling water is 46 °C.

[0210] (2) When increasing the cooling water volume in the low-temperature condensation module to make the flue gas outlet temperature of the purification equipment 50 °C, the moisture content of the flue gas is 5.0%, the escaped ammonia is 3 mg / m 3 , SO2 content 2 mg / m 3 , NOx content 32 mg / m 3 , CO2 concentration content 17.5%, dust content 2 mg / m 3 , the outlet water temperature of the cooling water is 41 °C.

[0211] In another embodiment of the purification equipment of the present application, when the flue gas inlet temperature of the flue gas is 150 °C, the moisture content of the flue gas is 7.5%, the escaped ammonia is 80 mg / m 3 , SO2 content 150 mg / m 3 , NOx content 40 mg / m 3 , CO2 concentration 21.0%, dust content 5 mg / m 3 , when the inlet water temperature of the cooling water is 28 °C,

[0212] The flue gas outlet temperature is 65 °C, the moisture content of the flue gas is 6.0%, the escaped ammonia is 15 mg / m 3 , SO2 content 42 mg / m 3 , NOx content 36 mg / m 3 , CO2 concentration 19.0%, dust content 3 mg / m 3 , at this time the outlet water temperature of the cooling water is 65 °C.

[0213] For the case where the flue gas inlet temperature is relatively high, or the moisture content of the flue gas is relatively low, or the escaped ammonia content at the flue gas inlet is relatively high, in order to further improve the purification efficiency of the escaped ammonia, such as Figure 1B and Figure 2AAs shown in the figure, an embodiment of the present application provides a self-sustaining one-step purification device with an atomization device. The atomization device 3 is used to spray atomized water towards the flue gas inlet 4. The installation position of the atomization device 3 is at the flue gas inlet 4. More specifically, the atomization device 4 is installed at the trapezoidal joint of the connection position between the flue gas discharge port of the cement kiln and the flue gas inlet 4 of the purification device. However, it should be noted that the installation position of the atomization device 3 is not limited to the flue gas inlet 4. For example, in some other embodiments, the atomization device 3 can also be installed at the flue gas discharge port of the cement kiln or a more forward position. Spraying atomized water towards the flue gas inlet can increase the water content in the flue gas. The specific principle is as follows: Since the temperature of the flue gas is high, the atomized water will be evaporated into water vapor by the high temperature of the flue gas after entering the flue gas, thus increasing the water vapor content in the flue gas. When the water vapor content in the flue gas is low, spraying atomized water through the atomization device 3 can increase the water vapor content in the flue gas, thereby improving the ammonia removal efficiency. In addition, a reagent (a reagent helpful for ammonia removal, denitration, and desulfurization) can also be added to the atomized water. Adding the reagent in the form of atomized water can allow the reagent to fully contact the flue gas, further improving the cleanliness of the discharged flue gas. Finally, the atomized water can also cool the flue gas, reducing the working pressure of the subsequent low-temperature condensation module 1.

[0214] When the flue gas temperature at the flue gas inlet is greater than 120 °C, or the moisture content of the flue gas at the flue gas inlet is less than 8%, or the escaped ammonia at the flue gas inlet is 100 mg / m 3 , start the atomization device.

[0215] When the SO2 content at the flue gas inlet is greater than 100 mg / m 3 , start the atomization device and add a desulfurization reagent to the atomized water; and / or, when the Nox content at the flue gas inlet is greater than 50 mg / m 3 , start the atomization device and add a denitration reagent to the atomized water.

[0216] In an embodiment of the purification device of the present application, when the flue gas temperature at the flue gas inlet is 150 °C, the moisture content of the flue gas is 7.5%, the escaped ammonia is 80 mg / m 3 , the SO2 content is 150 mg / m 3 , the NOx content is 40 mg / m 3 , the CO2 concentration is 21.0%, the dust content is 5 mg / m 3 , and the water temperature at the cooling water inlet is 28 °C,

[0217] Enable the atomization device 3, adjust the moisture content of the inlet flue gas to 9.0%, reduce the inlet flue gas temperature to 128 °C, and increase the cooling water volume so that the flue gas temperature at the flue gas outlet of the purification device is 55 degrees Celsius, the moisture content of the flue gas is 5.0%, the escaped ammonia is 4 mg / m 3 、SO2 18 mg / m3 , NOx content is 34 mg / m 3 , CO2 concentration is 17.8%, dust content is 1.5 mg / m 3 , and the water temperature at the outlet of the cooling water is 48 °C at this time.

[0218] As a preferred embodiment of the present application, the purification device further includes a spray cleaning device 2. Since the flue gas contains particulate matter, the particulate matter will adhere to the surface of the cooling water pipes 102 of the low-temperature condensation module 1 and is difficult to remove due to long-term contact with the flue gas, reducing the heat exchange efficiency (i.e., the cooling efficiency of the flue gas) of the low-temperature condensation module 1. Therefore, as Figure 1B shown in the figure, water is sprayed through the spraying device 2 at the connection between the outlet 5 of the cement kiln flue gas and the deammoniation device. The sprayed water is in a columnar shape and is sprayed onto the flue gas port, and is washed onto the surface of the cooling water pipe fittings by the rapidly flowing flue gas blown out from the outlet 5 of the cement kiln flue gas, washing away the particulate matter adhered to the surface of the pipe fittings.

[0219] The embodiment of the present application also provides a modular purification device, which modularizes the purification device in the above embodiment. The modular purification device includes several purification device sub-modules, and several purification device sub-modules can be arranged in parallel and / or in series. Standardize the sub-modules, and determine the number of sub-modules and the connection method between the sub-modules according to the requirements and on-site layout.

[0220] Specifically, in an embodiment of the present application, one purification device can be made into two purification device sub-modules. When installed on-site, the two purification device sub-modules are placed side by side. Further, in order to ensure the connection reliability between the two sub-modules, the two purification device sub-modules can be connected by bolts or welding.

[0221] In addition, the sub-modules can also be placed at intervals. The outlet 5 of the cement kiln flue gas is divided into each branch pipe and enters each sub-module respectively, and finally the flue gas of all sub-modules is collectively discharged.

[0222] Since the sub-modules are of standardized design, when the actual application scenario exceeds the purification capacity of the sub-modules, several sub-modules can be connected in series along the flue gas flow direction for use.

[0223] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A grouped self-sustaining one-step purification device, characterized in that, It is used for purifying flue gas containing water vapor, ammonia, and acidic pollutants; the purification equipment includes: A flue gas inlet and a flue gas outlet, and a flue gas purification channel from the flue gas inlet to the flue gas outlet; A low-temperature condensation module, arranged in the flue gas purification channel; the low-temperature condensation module includes a cooling water pipe bundle vertically arranged and arranged in an array in the flue gas purification channel and an end joint assembly connected to the upper and lower ends of the cooling water pipe bundle. The end joint assembly and the cooling water pipe bundle together form a cooling water circulation pipeline for cooling water to flow from the cooling water inlet to the cooling water return outlet; the cooling water pipe bundle is divided into multiple cooling water pipe groups along the flue gas flow direction, and each cooling water pipe group includes multiple rows of cooling water pipes arranged along the flue gas flow direction; the cooling water between multiple cooling water pipe groups is not connected in the cooling water pipe bundle and the cooling water flow rate in the cooling water pipe group decreases sequentially along the flue gas flow direction; The low-temperature condensation module cools and condenses the flue gas entering the flue gas purification channel from the flue gas inlet, condenses the water vapor into condensed water, and the ammonia and the acidic pollutants dissolve in the condensed water and undergo an acid-base neutralization reaction in the condensed water to generate non-volatile salts that are easily soluble in the condensed water; The cooling water pipe is a circular cooling water pipe; the end joint assembly includes an upper end joint assembly and a lower end joint assembly, both of which include end joints with the same structure. The end joint is a circular pipe elbow that connects the ends of two adjacent circular cooling water pipes in two adjacent rows of the circular cooling water pipes; The cooling water pipe bundle is arranged in a staggered tube bundle array, and the adjacent two rows of cooling water pipes in each cooling water pipe group are staggered in the flue gas flow direction and there is no gap between the orthographic projection surfaces; It also includes at least one demisting, water collecting, and water blocking plate vertically arranged at the flue gas outlet.

2. The grouped self-sustaining one-step purification device according to claim 1, wherein Each cooling water pipe group is connected to a water collecting pipe and a return pipe.

3. The grouped self-sustaining one-step purification device according to claim 1, characterized in that, It includes a box body, the box body includes a top box plate, a bottom box plate, a front box plate, and a rear box plate that are hermetically connected. The left and right sides of the box body are openings for the flue gas inlet and the flue gas outlet; water pipe installation holes for installing the upper and lower ends of the cooling water pipe bundle are opened on the top box plate and the bottom box plate, and an annular groove is opened on the inner wall of the water pipe installation hole along its circumferential direction; the end of the cooling water pipe is arranged in the water pipe installation hole, and a part of the cooling water pipe body corresponding to the annular groove is provided with an annular protrusion, and the annular protrusion is hermetically embedded in the annular groove so that the end of the cooling water pipe body forms a curved surface seal with the water pipe installation hole.

4. The grouped self-sustaining one-step purification device according to claim 3, wherein, Sealant is arranged in the annular groove, and the annular groove is coaxially arranged with the water pipe installation hole; a rubber gasket is also arranged in the annular groove, and the annular protrusion presses the rubber gasket tightly in the annular groove.

5. The grouped self-sustaining one-step purification device according to claim 4, wherein, The annular groove includes multiple grooves arranged at intervals along the circumferential direction of the inner wall of the water pipe installation hole, and the extension depths of the multiple grooves on the inner wall are different.

6. The grouped self-sustaining one-step purification device according to claim 5, characterized in that, The annular grooves are provided in plurality and distributed along the axial direction of the water pipe mounting hole.

7. The grouped self-sustaining one-step purification device according to claim 1, wherein, The plate surface of the demisting, water collecting and water blocking plate is a zigzag surface; at least part of the demisting, water collecting and water blocking plate is formed with oblong holes extending vertically along the surface of the demisting, water collecting and water blocking plate; a wire mesh is further arranged outside the demisting, water collecting and water blocking plate.

8. The grouped self-sustaining one-step purification device according to claim 1, wherein It further includes a condensate water collecting device arranged at the bottom of the low-temperature condensation module for collecting the condensate water, and the condensate water collecting device is connected to a condensate water discharge port.

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