Evaporation system and boiler flue gas purification treatment device

Abstract

The present application belongs to wastewater treatment technical field and disclose a kind of evaporation system and boiler flue gas purification treatment device, the evaporation system includes evaporation device, spraying device, first pipeline, ash storage chamber and second pipeline, evaporation device includes shell;Spraying device includes pumping assembly and spray pipe, spray pipe is located in chamber, spray pipe is below the inlet of smoke, pumping assembly is connected with spray pipe;First pipeline is connected with the inlet of smoke of shell and the flue gas duct of boiler;Ash storage chamber is connected with the ash outlet of shell, ash storage chamber is used to store the ash and slag discharged from chamber;Second pipeline is connected with the smoke outlet of shell, dust removal assembly is provided on second pipeline, the ash outlet of dust removal assembly is connected with ash storage chamber.The evaporation system in the embodiment of the application can utilize high-temperature flue gas to directly contact with desulfurization wastewater, vaporize water in desulfurization wastewater, and collect ash and slag in desulfurization wastewater, to improve the treatment effect of desulfurization wastewater.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater treatment, and particularly relates to an evaporation system and a boiler flue gas purification treatment device. BACKGROUND

[0002] The boiler flue gas contains a large amount of pollution components, and needs to be treated before being discharged into the atmosphere. At present, the flue gas is treated by a desulfurization tower, and the desulfurization wastewater generated by the desulfurization tower needs to be further treated by a matched device. If the desulfurization wastewater is not properly treated, secondary pollution is easily caused.

[0003] In the related art, the desulfurization wastewater is treated by using a multistage evaporation method to concentrate the desulfurization wastewater, so as to reduce the total amount of the desulfurization wastewater. However, ultimately, the concentrated wastewater still needs to be further treated, and the treatment efficiency is low. SUMMARY

[0004] The present application aims to at least partially solve one of the problems in the related art.

[0005] To this end, an embodiment of the present application provides an evaporation system, which can directly contact high-temperature flue gas with desulfurization wastewater, vaporize water in the desulfurization wastewater, and collect ash in the desulfurization wastewater, thereby improving the treatment effect of the desulfurization wastewater.

[0006] An embodiment of the present application also provides a boiler flue gas purification treatment device.

[0007] The evaporation system according to an embodiment of the present application comprises:

[0008] An evaporation device, which comprises a shell having a cavity, a flue gas inlet being arranged at the top of the shell and communicating with the cavity, an ash outlet being arranged at the bottom of the shell and communicating with the cavity, and a flue gas outlet being arranged at the side of the shell and communicating with the cavity;

[0009] A spraying device, which comprises a pumping assembly and a spraying pipe, the spraying pipe being arranged in the cavity and located below the flue gas inlet, and the pumping assembly being connected with the spraying pipe and used for pumping desulfurization wastewater into the spraying pipe;

[0010] A first pipeline, one end of which is connected with the flue gas inlet of the shell, and the other end of which is connected with a flue gas discharge pipeline of a boiler, the first pipeline being used for introducing flue gas in the flue gas discharge pipeline into the cavity;

[0011] An ash storage chamber, which is connected with the ash outlet of the shell and used for storing ash discharged from the cavity;

[0012] A second pipeline is connected with the smoke outlet of the shell, and a dust removal assembly is arranged on the second pipeline, and an ash discharge port of the dust removal assembly is connected with the ash storage chamber.

[0013] The evaporation system can directly contact high-temperature flue gas with desulfurization wastewater, gasify water in the desulfurization wastewater, and collect ash in the desulfurization wastewater, thereby improving the treatment effect of the desulfurization wastewater.

[0014] In some embodiments, the pumping assembly comprises:

[0015] A main pipeline is arranged for conveying desulfurization wastewater.

[0016] A first sub-pipeline and a second sub-pipeline are arranged in parallel, a first pump body is arranged on the first sub-pipeline, an inlet end of the first sub-pipeline is connected with the main pipeline, an outlet end of the first sub-pipeline is connected with the spray pipeline, an inlet end of the second sub-pipeline is connected with the main pipeline, and an outlet end of the second sub-pipeline is connected with the first pipeline.

[0017] In some embodiments, a check valve is arranged on the second sub-pipeline; and / or

[0018] The fluid flow in the second sub-pipeline is 25% to 35% of the fluid flow in the main pipeline; and / or

[0019] The pumping assembly further comprises a first adjusting assembly for adjusting the flow in the main pipeline, the first sub-pipeline and the second sub-pipeline.

[0020] In some embodiments, the evaporation system further comprises an ammonia injection device and an SNCR device, the ammonia injection device and the SNCR device are connected to the first pipeline, the ammonia injection device comprises a third pipeline and a second adjusting assembly, the third pipeline is connected with the first pipeline, the third pipeline is arranged for conveying a medium, and the second adjusting assembly is arranged for controlling the amount of ammonia injection and / or controlling the on-off of the third pipeline; and / or

[0021] The evaporation system further comprises a fourth pipeline connected at the ash outlet of the shell, a second pump body is arranged on the fourth pipeline, and the second pump body is arranged for conveying the ash discharged from the ash outlet into the ash storage chamber; and / or

[0022] The evaporation system further comprises a first detection component arranged on the shell, and the first detection component is arranged for detecting the air pressure in the chamber; and / or

[0023] The evaporation system further comprises a second detection component arranged on the second pipeline, and the second detection component is arranged for detecting the flow of flue gas in the second pipeline; and / or

[0024] The dust removal assembly is an electric dust collector; and / or

[0025] The smoke inlet of the shell is provided with a volute, the inlet of the volute is connected with the first pipeline, the outlet of the volute is located in the chamber, and a flow guide plate corresponding to the outlet of the volute is arranged in the chamber; and / or

[0026] The ash outlet is provided with a rotary valve.

[0027] In some embodiments, the chamber has a first cavity and a second cavity, the first cavity is located between the smoke inlet and the smoke outlet, the spray pipe is located at the top of the first cavity, the second cavity is located between the smoke outlet and the ash outlet, and the second cavity is in an inverted conical shape.

[0028] In some embodiments, an evaporation assembly is further included, the evaporation assembly is arranged in the first cavity, the evaporation assembly is located below the spray pipe and above the smoke outlet, the evaporation assembly has a plurality of first plate bodies, and the plurality of first plate bodies are arranged in the first cavity to form a plurality of flow channels in the first cavity for the flue gas and the spray liquid to flow through the flow channels.

[0029] In some embodiments, the number of evaporation assemblies is multiple groups, the multiple groups of evaporation assemblies are arranged in a vertical direction, and each evaporation assembly includes a plurality of first plate bodies arranged in parallel and at intervals.

[0030] In some embodiments, the plurality of first plate bodies in the evaporation assembly are arranged in parallel and at intervals in a horizontal direction, and the first plate bodies are in an S shape or a V shape; and / or

[0031] A first opening is arranged on the side of the shell, the evaporation assembly has a second plate body, the first plate body is arranged on the second plate body, the second plate body is detachably connected to the shell corresponding to the first opening, a plurality of scrapers are arranged on the shell corresponding to the first opening, a slot corresponding to the first plate body is arranged between two adjacent scrapers, the first plate body is slidable in the slot, and the scraper abuts against the first plate body; and / or

[0032] A gas distribution hole is arranged on the side wall of the shell corresponding to the second cavity, a third pump body is connected to the gas distribution hole through a fifth pipeline, and the third pump body is used for pumping air into the second cavity.

[0033] The boiler flue gas purification treatment device in the embodiment includes:

[0034] An evaporation system, which is the evaporation system according to any one of the above embodiments, and a first pipeline of the evaporation system is connected with a flue gas pipeline of a boiler;

[0035] a desulfurization tower, a flue gas inlet of the desulfurization tower being connected with an exhaust flue of the boiler and / or a second pipeline of the evaporation system, and a desulfurization wastewater discharge outlet of the desulfurization tower being connected with the pumping assembly of the evaporation system.

[0036] In some embodiments, in use, the following steps are included:

[0037] acquiring a flue gas flow in the first pipeline, adjusting a desulfurization wastewater flow delivered by the pumping assembly into the first pipeline, so that a flue gas temperature in the first pipeline is at a first threshold value;

[0038] adjusting an air pressure in the chamber to a second threshold value;

[0039] adjusting a desulfurization wastewater flow delivered by the pumping assembly into the spray pipe, so that a flue gas temperature in the second pipeline is at a third threshold value. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic diagram of an evaporation system in an embodiment of the present application.

[0041] Figure 2 is a structural schematic diagram of an evaporation device in an embodiment of the present application.

[0042] Figure 3 is a structural schematic diagram of an evaporation assembly in an embodiment of the present application.

[0043] Figure 4 is a structural schematic diagram of a cleaning state of an evaporation assembly in an embodiment of the present application.

[0044] Figure 5 is a structural schematic diagram of an evaporation assembly in an embodiment of the present application.

[0045] REFERENCE NUMERALS:

[0046] 1, evaporation device; 11, chamber; 111, first cavity; 112, second cavity; 12, flue gas inlet; 13, flue gas outlet; 14, ash outlet; 141, fourth pipeline; 142, second pump body; 143, rotary valve; 15, first detection component; 16, volute; 17, guide plate;

[0047] 2, spray device; 21, spray pipe; 22, first pump body; 23, main pipeline; 24, first branch pipeline; 25, second branch pipeline; 26, check valve; 27, first adjusting assembly;

[0048] 3, first pipeline; 31, ammonia injection device; 311, third pipeline; 312, second adjusting assembly; 32, SNCR device;

[0049] 4. Second pipe; 41. Second detection component; 42. Dust removal assembly;

[0050] 5. Ash storage chamber;

[0051] 6. Evaporation assembly; 61. First plate body; 62. Second plate body; 63. Scraper;

[0052] 7. Third pump body;

[0053] 8. Boiler; 81. Coal economizer. DETAILED DESCRIPTION

[0054] The embodiments of the present application will be described in detail below with reference to the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0055] As shown in Figure 1 and Figure 2 The evaporation system of the embodiment of the present application includes an evaporation device 1 and a spraying device 2. The evaporation device 1 includes a shell having a chamber 11. The top of the shell is provided with a smoke inlet 12 communicating with the chamber 11. The bottom of the shell is provided with an ash outlet 14 communicating with the chamber 11. The side of the shell is provided with a smoke outlet 13 communicating with the chamber 11.

[0056] The spraying device 2 includes a pumping assembly and a spraying pipe 21. The spraying pipe 21 is arranged in the chamber 11 and is located below the smoke inlet 12. The pumping assembly is connected with the spraying pipe 21 and is used to pump desulfurization wastewater into the spraying pipe 21.

[0057] The first pipe 3 is connected with the smoke inlet 12 of the shell and is connected with the smoke exhaust pipe of the boiler 8. The first pipe 3 is used to introduce the flue gas in the smoke exhaust pipe into the chamber 11. The high-temperature flue gas discharged by the boiler 8 enters the chamber 11 through the first pipe 3 and directly contacts with the desulfurization wastewater sprayed by the spraying pipe 21. The moisture in the desulfurization wastewater is vaporized and evaporated by the heat, and the ash in the desulfurization wastewater is settled at the bottom of the chamber 11.

[0058] The ash outlet 14 of the shell is connected with the ash storage chamber 5. The ash storage chamber 5 is used to store the ash discharged from the chamber 11.

[0059] The smoke outlet 13 of the shell is connected with the second pipe 4. The second pipe 4 is provided with the dust removal assembly 42. The ash outlet of the dust removal assembly 42 is connected with the ash storage chamber 5. The dust removal assembly 42 is used to filter the flue gas discharged from the second pipe 4 and to deliver the filtered ash to the ash storage chamber 5, so as to facilitate the subsequent centralized treatment of the ash.

[0060] The evaporation system in the embodiment of the present application can directly contact the high-temperature flue gas with the desulfurization wastewater, gasify the water in the desulfurization wastewater, and collect the ash in the desulfurization wastewater, thereby improving the treatment effect of the desulfurization wastewater. In the embodiment of the present application, the high-temperature flue gas generated by the boiler 8 is used to treat the desulfurization wastewater. Normally, the high-temperature flue gas generated by the boiler 8 is discharged after passing through the economizer 81. The first pipeline 3 in the embodiment of the present application is connected to the inlet end of the economizer 81 to obtain the flue gas with a higher temperature.

[0061] As shown in Figure 1 and Figure 2 In some embodiments, the pumping assembly includes a main pipeline 23 for conveying the desulfurization wastewater, a first branch pipeline 24 and a second branch pipeline 25 connected in parallel. The first branch pipeline 24 is provided with a first pump body 22. The inlet end of the first branch pipeline 24 is connected to the main pipeline 23, and the outlet end of the first branch pipeline 24 is connected to the spray pipeline 21. The inlet end of the second branch pipeline 25 is connected to the main pipeline 23, and the outlet end of the second branch pipeline 25 is connected to the first pipeline 3.

[0062] Specifically, the pumping assembly is not only used to convey the desulfurization wastewater to the spray pipeline 21, but also used to convey a part of the desulfurization wastewater to the first pipeline 3. By arranging the first branch pipeline 24 and the second branch pipeline 25 in parallel on the main pipeline 23, and conveying a certain amount of desulfurization wastewater to the first pipeline 3 through the second branch pipeline 25, the temperature of the flue gas entering the chamber 11 can be reduced. For example, the temperature of the flue gas generated by the boiler 8 is about 550℃. After a certain amount of desulfurization wastewater is added, the temperature of the flue gas can be reduced to 400℃-450℃, for example, 400℃, 420℃ or 450℃, which facilitates the control of the temperature of the smoke outlet 13 of the shell and improves the treatment capacity of the desulfurization wastewater.

[0063] As shown in Figure 1 and Figure 2 In some embodiments, the second branch pipeline 25 is provided with a check valve 26. The arrangement of the check valve 26 can prevent the desulfurization wastewater from flowing back due to excessive air pressure in the first pipeline 3 and failing to enter the first pipeline 3.

[0064] In some embodiments, the fluid flow in the second branch pipeline 25 is 25%-35% of the fluid flow in the main pipeline 23.

[0065] That is, 25%-35% of the total flow of the desulfurization wastewater in the main pipeline 23 enters the first pipeline 3 through the second branch pipeline 25, and the remaining desulfurization wastewater is sprayed into the chamber 11 by the spray pipeline 21 through the first branch pipeline 24, so that the spray liquid contacts the flue gas. The embodiment of the present application can improve the utilization rate of the preheating of the flue gas, improve the heat exchange effect, reduce the temperature of the flue gas at the smoke outlet 13 to about 130℃, improve the temperature drop effect of the flue gas, and increase the treatment capacity of the desulfurization wastewater.

[0066] As shown in Figure 1 and Figure 2 In some embodiments, the pumping assembly further comprises a first regulating assembly 27 for regulating the flow in the main pipe 23, the first branch pipe 24 and the second branch pipe 25. The first regulating assembly 27 comprises flow meters and control valves, which can be digital valves, for regulating the flow in the pipes of the pumping assembly by a control system.

[0067] For example, a first control valve is arranged on the main pipe 23 for regulating the flow in the main pipe 23 to adapt the flow in the main pipe 23 to the flow of the flue gas to ensure that the flue gas introduced into the chamber 11 evaporates the water in the desulfurization wastewater sufficiently. A second control valve and a third control valve can also be arranged on the first branch pipe 24 and the second branch pipe 25, respectively, for regulating the flow in the branch pipes. The flow meters can be arranged on the main pipe 23, the first branch pipe 24 and / or the second branch pipe 25 as needed.

[0068] As shown in Figure 1 and Figure 2 In some embodiments, the evaporation system further comprises an ammonia injection device 31 and an SNCR device 32, which are connected to the first pipe 3. The ammonia injection device 31 comprises a third pipe 311 and a second regulating assembly 312. The third pipe 311 is connected to the first pipe 3 and is used to transport a medium. The second regulating assembly 312 is used to control the amount of ammonia injection and / or to control the on-off of the third pipe 311. The ammonia injection device 31 and the SNCR device 32 are used to perform denitration treatment on the flue gas.

[0069] The amount of ammonia injection in the ammonia injection device 31 is controlled by the second regulating assembly 312. The second regulating assembly 312 comprises flow meters and control valves, which are used to adjust the amount of ammonia injection according to the flow of the flue gas in the first pipe 3. Specifically, the flow meters and the control valves are used to adjust the flow of the medium in the third pipe 311. The SNCR device 32 is used to perform further denitration treatment on the flue gas.

[0070] As shown in Figure 1 and Figure 2As shown in the drawings, in some embodiments, the evaporation system further comprises a fourth pipeline 141 connected at the ash outlet 14 of the shell, and a second pump body 142 is arranged on the fourth pipeline 141, and the second pump body 142 is used to transport the ash discharged from the ash outlet 14 into the ash storage chamber 5. Since the large-particle-size ash after evaporation of the desulfurization wastewater will settle at the bottom of the cavity 11, and a part of the small-particle-size ash will flow out of the smoke outlet 13 with the flue gas, in order to facilitate the transportation of the large-particle-size ash after being discharged from the ash outlet 14, the second pump body 142 is arranged on the fourth pipeline 141 in the embodiment of the application, the second pump body 142 is a pneumatic conveying pump, and the ash discharged from the ash outlet 14 is conveyed by pneumatic conveying, thereby realizing long-distance transportation and improving the transportation efficiency.

[0071] As shown in the drawings, Figure 1 and Figure 2 In some embodiments, the ash outlet 14 is provided with a rotary valve 143. The rotary valve 143 can reduce the overflow of flue gas from the ash outlet 14 while ensuring that the ash outlet 14 can normally discharge materials.

[0072] As shown in the drawings, Figure 1 and Figure 2 In some embodiments, the evaporation system further comprises a first detection component 15 arranged on the shell, and the first detection component 15 is used to detect the air pressure in the cavity 11. The first detection component 15 is a pressure gauge. By detecting the pressure in the cavity 11, the stability of the internal environment of the cavity 11 is ensured, and the normal operation of the evaporation process of the desulfurization wastewater is ensured.

[0073] As shown in the drawings, Figure 1 and Figure 2 In some embodiments, the evaporation system further comprises a second detection component 41 arranged on the second pipeline 4, and the second detection component 41 is used to detect the flue gas flow in the second pipeline 4. The second detection component 41 is a flow meter. By detecting the flue gas flow in the second pipeline 4, the running condition of the evaporation process can be judged to ensure the normal operation of the evaporation process.

[0074] As shown in the drawings, Figure 1 and Figure 2 In some embodiments, the dust removal assembly 42 is an electric dust collector. The electric dust collector can remove dust from the flue gas in the second pipeline 4, facilitate the subsequent process treatment of the flue gas in the second pipeline 4, and avoid secondary pollution caused by pollutants in the desulfurization wastewater in the form of fine particle fly ash.

[0075] As shown in the drawings, Figure 1 and Figure 2As shown in the drawings, in some embodiments, the smoke inlet 12 of the shell is provided with a volute 16, the inlet of the volute 16 is connected with the first pipeline 3, the outlet of the volute 16 is located in the chamber 11, and a guide plate 17 corresponding to the outlet of the volute 16 is arranged in the chamber 11. The volute 16 can guide and pressurize the flue gas entering the chamber 11, so that the flue gas enters the chamber 11 more uniformly, and the guide plate 17 can further guide the flue gas, improve the uniformity of the distribution of the flue gas in the chamber 11, and reduce the airflow dead angle in the chamber 11.

[0076] As shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, in some embodiments, the chamber 11 has a first cavity 111 and a second cavity 112, the first cavity 111 is located between the smoke inlet 12 and the smoke outlet 13, the spray pipe 21 is located at the top of the first cavity 111, and the second cavity 112 is located between the smoke outlet 13 and the ash outlet 14, and the second cavity 112 is in an inverted conical shape.

[0077] Specifically, the chamber 11 in the embodiment of the present application is divided into two parts, the first cavity 111 is used for the contact of flue gas and spray liquid, so that the flue gas and the spray liquid can be fully heat exchanged in the first cavity 111, the second cavity 112 is used for storing ash, so that the ash can be settled in the second cavity 112, the smoke outlet 13 is an intermediate region between the first cavity 111 and the second cavity 112, which reduces the disturbance of the flue gas to the ash settled in the second cavity 112, and the second cavity 112 is in an inverted conical shape, so that the cross-sectional area of the second cavity 112 gradually decreases from top to bottom, facilitating the gathering and discharge of the ash.

[0078] As shown in the drawings, Figure 2 to Figure 5 As shown in the drawings, in some embodiments, the evaporation system further comprises an evaporation assembly 6, the evaporation assembly 6 is arranged in the first cavity 111, the evaporation assembly 6 is located below the spray pipe 21 and above the smoke outlet 13, the evaporation assembly 6 has a plurality of first plate bodies 61, and the plurality of first plate bodies 61 are arranged in the first cavity 111 to form a plurality of flow channels in the first cavity 111, so that the flue gas and the spray liquid can flow through the flow channels.

[0079] In the embodiment of the present application, the setting of multiple flow channels can make the flue gas and the spray liquid of desulfurization wastewater flow in each flow channel, thereby improving the evaporation effect. The flue gas heats the first plate body 61 while heating the spray liquid of desulfurization wastewater, and part of the spray liquid can flow along the first plate body 61, thereby evaporating the part of the spray liquid. The first plate body 61 can also divide the first cavity 111 into regions, thereby improving the stability of the flow of flue gas and spray liquid, reducing flow dead angles, and improving the contact effect of the spray liquid and the flue gas. In this way, the different airflow velocities, different flow rates, and large temperature differences in the central region and the peripheral region of the chamber 11 are solved. The first plate body 61 is heated by the flue gas and can resist the fluctuations in the temperature of the flue gas, thereby ensuring the evaporation effect of the spray liquid.

[0080] Further, the setting of the flow channels can reduce the disturbance of the smoke outlet 13 to the airflow in the chamber 11, so that the flue gas and the spray liquid can flow stably and uniformly in a long enough distance, thereby improving the evaporation effect and avoiding the uneven collection of the airflow in the first cavity 111 due to the guiding effect of the smoke outlet 13, which causes the spray liquid in some regions to be unable to be effectively evaporated.

[0081] As shown in FIG. 1, Figure 2 to Figure 5 In some embodiments, the number of evaporation assemblies 6 is multiple groups, and the multiple groups of evaporation assemblies 6 are arranged in the vertical direction. Each evaporation assembly 6 includes multiple first plate bodies 61 arranged in parallel and at intervals.

[0082] That is, in the vertical direction, as the height in the first cavity 111 gradually decreases, the temperature in the first cavity 111 also gradually decreases. The change characteristics of the spray liquid in different temperature intervals are different. For example, in the region of the first cavity 111 close to the spray pipe 21, the spray liquid and the flue gas just contact, and the spray liquid is in the heat absorption evaporation stage. In the region of the first cavity 111 close to the second cavity 112, the spray liquid of desulfurization wastewater has been fully evaporated. The flue gas contains fly ash and ash, and the fly ash and ash are in the settling stage. In the heat absorption evaporation stage and the settling stage, a stable airflow environment needs to be provided. The arrangement of the first plate body 61 in the embodiment of the present application can make the airflow flow relatively stably in the flow channel, thereby improving the evaporation effect.

[0083] Further, according to the different height positions in the first cavity 111, the density, arrangement mode, structure shape, and maintenance frequency of the first plate body 61 will be different. Therefore, the evaporation assembly 6 is set to multiple groups to meet the process stage requirements of different height positions in the first cavity 111.

[0084] As shown in FIG. 1, Figure 2 to Figure 5As shown, in some embodiments, a plurality of first plates 61 in the evaporation assembly 6 are arranged in parallel and spaced apart along the horizontal direction, and the first plates 61 are S-shaped or V-shaped. Setting the first plates 61 as S-shaped or V-shaped can, on the one hand, increase the length of the flue gas flow path, and on the other hand, allow at least part of the flue gas to impact the first plates 61, and at least part of the spray liquid can also impact the first plates 61. The flue gas heats the first plates 61, and the spray liquid can be evaporated by the temperature of the first plates 61 when impacting the first plates 61. The first plates 61 are used as evaporation surfaces to achieve sufficient evaporation of the spray liquid.

[0085] Optionally, the evaporation assembly 6 is in three groups. The first plate 61 in the top and bottom two groups of evaporation assemblies 6 are both flat plate structures, and the first plate 61 in the middle evaporation assembly 6 is an S-shaped plate or a V-shaped plate.

[0086] like Figure 2 to Figure 5 As shown, in some embodiments, a first opening is provided on the side of the housing, the evaporation assembly 6 has a second plate 62, a first plate 61 is arranged on the second plate 62, the second plate 62 is detachably connected to the housing corresponding to the first opening, a plurality of scrapers 63 are provided on the housing corresponding to the first opening, a groove corresponding to the first plate 61 is provided between two adjacent scrapers 63, the first plate 61 can slide in the groove, and the scraper 63 abuts against the first plate 61.

[0087] Specifically, the evaporation assembly 6 can be disassembled from the first opening, facilitating cleaning of the first opening and replacement of the evaporation assembly 6, thus improving its practicality. Multiple scrapers 63 are provided on the shell at the first opening, with grooves corresponding to the first plate 61 formed between adjacent scrapers 63. The first plate 61 slides within the grooves, and the scrapers 63 on both sides of the grooves abut against the two walls of the first plate 61. When disassembling the evaporation assembly 6, as the first plate 61 is pulled out of the chamber 11, the scrapers 63 can clean the ash and slag adhering to the first plate.

[0088] During operation, the evaporation component 6 does not need to be completely disassembled. By pulling out the second plate 62, the first plate 61 can be moved back and forth in the slot several times, and the scraper 63 can be used to clean the ash and slag on the first plate 61.

[0089] like Figure 2 to Figure 5As shown, in some embodiments, a gas distribution hole is arranged on the side wall of the shell corresponding to the second cavity 112, and a third pump body 7 is connected to the gas distribution hole through a fifth pipeline, and the third pump body 7 is used to pump air into the second cavity 112. The third pump body 7 is an air pump, which is used to pump air into the second cavity 112. On the one hand, the air can cool the ash settled in the second cavity 112, and on the other hand, it can replace the flue gas in the ash, reduce the amount of flue gas discharged with the ash, and at the same time, it can also reduce the exhaust temperature of the smoke outlet 13.

[0090] Optionally, the third pump body 7 works intermittently. When it is necessary to discharge ash from the ash outlet 14, the third pump body 7 works to replace the flue gas in the ash and cool the ash. When ash is not discharged, the third pump body 7 stops working.

[0091] The boiler flue gas purification treatment device in the embodiment of the present application comprises an evaporation system and a desulfurization tower. The evaporation system is the evaporation system in any one of the above embodiments. The first pipeline 3 of the evaporation system is connected with the flue gas discharge pipeline of the boiler 8. The flue gas inlet of the desulfurization tower is connected with the flue gas discharge pipeline of the boiler 8 and / or the second pipeline 4 of the evaporation system. The desulfurization wastewater discharge port of the desulfurization tower is connected with the pumping assembly of the evaporation system.

[0092] The flue gas needs to pass through the desulfurization tower for desulfurization. The desulfurization tower uses a spraying method for flue gas desulfurization. A large amount of desulfurization wastewater is generated. The evaporation system of the embodiment of the present application can fully evaporate the water in the desulfurization wastewater, solving the problem of low work efficiency caused by the multiple concentration treatment process of the desulfurization wastewater in the related art. The high-temperature flue gas generated by the boiler 8 is used to realize the recycling of heat energy. The desulfurization wastewater treatment capacity is large, and the application prospect is good.

[0093] In some embodiments, in use, the following steps are included:

[0094] S101, acquire the flue gas flow in the first pipeline 3, and adjust the flow of the desulfurization wastewater delivered to the first pipeline 3 by the pumping assembly, so that the flue gas temperature in the first pipeline 3 is at a first threshold value. Since the temperature of the flue gas discharged by the boiler 8 is about 550℃, in order to fully utilize the temperature of the flue gas, the desulfurization wastewater is divided into two parts in the embodiment of the present application. One part is sprayed into the chamber 11, and the other part is sent into the first pipeline 3 for flue gas cooling. The evaporation of the part of the desulfurization wastewater is also realized at the same time.

[0095] For example, by delivering the desulfurization wastewater into the first pipeline 3, the flue gas temperature in the first pipeline 3 is reduced to 400℃-450℃, for example, 400℃, 420℃ or 450℃.

[0096] S102, adjust the air pressure in the chamber 11 to a second threshold value, the air pressure in the chamber 11 is related to the boiling point of water, in order to ensure the normal operation of the evaporation process, the air pressure in the chamber 11 needs to be maintained in a stable and reasonable range.

[0097] S103, adjust the flow of desulfurization wastewater pumped into the spray pipe 21 by the pumping assembly, so that the flue gas temperature in the second pipeline 4 is at a third threshold value. Under the premise of ensuring that the desulfurization wastewater can be fully evaporated and realizing zero discharge of the desulfurization wastewater, the flow of the desulfurization wastewater is increased, so that the flue gas temperature in the second pipeline 4 is at a third threshold value, for example, the flue gas temperature of the second pipeline 4 is controlled at 110-150 DEG C, for example, 110 DEG C, 120 DEG C, 130 DEG C or 150 DEG C, the temperature drop efficiency is improved, and the treatment capacity of the desulfurization wastewater is improved.

[0098] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0099] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0100] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0101] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0102] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the specification are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0103] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An evaporation system, characterized in that, include: An evaporation device includes a housing with a chamber, a smoke inlet communicating with the chamber at the top of the housing, an ash outlet communicating with the chamber at the bottom of the housing, and a smoke outlet communicating with the chamber at the side of the housing. A spraying device, comprising a pumping assembly and a spraying pipe, wherein the spraying pipe is disposed in the chamber and located below the flue gas inlet, and the pumping assembly is connected to the spraying pipe, the pumping assembly being used to pump desulfurization wastewater into the spraying pipe; A first pipe, one end of which is connected to the flue gas inlet of the housing, and the other end of which is connected to the flue gas exhaust pipe of the boiler, the first pipe being used to introduce the flue gas in the flue gas exhaust pipe into the chamber; An ash storage chamber is connected to the ash outlet of the shell and is used to store ash and slag discharged from the chamber. The second pipe is connected to the smoke outlet of the housing, and a dust removal component is provided on the second pipe. The ash discharge port of the dust removal component is connected to the ash storage chamber. The pumping assembly includes: The main pipeline is used to transport desulfurization wastewater; The first branch pipe and the second branch pipe are connected in parallel. The first branch pipe is equipped with a first pump body. The inlet end of the first branch pipe is connected to the main pipe, and the outlet end of the first branch pipe is connected to the spray pipe. The inlet end of the second branch pipe is connected to the main pipe, and the outlet end of the second branch pipe is connected to the first pipe.

2. The evaporation system according to claim 1, characterized in that, The second branch pipe is equipped with a check valve; The fluid flow rate in the second branch pipe is 25% to 35% of the fluid flow rate in the main pipe; The pumping assembly further includes a first regulating assembly, which is used to regulate the flow rate in the main pipe, the first branch pipe, and the second branch pipe.

3. The evaporation system according to any one of claims 1 to 2, characterized in that, It also includes an ammonia injection device and an SNCR device, which are connected to the first pipeline. The ammonia injection device includes a third pipeline and a second regulating component. The third pipeline is connected to the first pipeline and is used to transport the medium. The second regulating component is used to control the amount of ammonia injected and / or control the on / off state of the third pipeline. It also includes a fourth pipe, which is connected to the ash outlet of the shell. The fourth pipe is equipped with a second pump body, which is used to transport the ash and slag discharged from the ash outlet to the ash storage chamber. It also includes a first detection component, which is disposed on the housing and is used to detect the air pressure inside the cavity; It also includes a second detection component, which is disposed on the second pipe and is used to detect the flue gas flow rate in the second pipe; The dust removal component is an electrostatic precipitator; The smoke inlet of the housing is provided with a volute, the inlet of the volute is connected to the first pipe, the outlet of the volute is located in the cavity, and a guide plate corresponding to the outlet of the volute is provided in the cavity; The ash outlet is equipped with a rotary valve.

4. The evaporation system according to any one of claims 1 to 2, characterized in that, The chamber has a first chamber and a second chamber. The first chamber is located between the smoke inlet and the smoke outlet, and the spray pipe is located at the top of the first chamber. The second chamber is located between the smoke outlet and the ash outlet, and the second chamber is in the shape of an inverted cone.

5. The evaporation system according to claim 4, characterized in that, It also includes an evaporation assembly disposed in the first cavity. The evaporation assembly is located below the spray pipe and above the smoke outlet. The evaporation assembly has a plurality of first plates disposed in the first cavity to form a plurality of flow channels in the first cavity for the flow of flue gas and spray liquid.

6. The evaporation system according to claim 5, characterized in that, The number of evaporation components is multiple sets, and the multiple sets of evaporation components are arranged in a vertical direction. Each evaporation component includes multiple first plates arranged in parallel and at intervals.

7. The evaporation system according to claim 6, characterized in that, The plurality of first plates in the evaporation assembly are arranged in parallel and spaced apart along the horizontal direction, and the first plates are S-shaped or V-shaped. The side of the housing is provided with a first opening, the evaporation assembly has a second plate, the first plate is arranged on the second plate, the second plate is detachably connected to the housing corresponding to the first opening, a plurality of scrapers are provided on the housing corresponding to the first opening, a groove corresponding to the first plate is provided between two adjacent scrapers, the first plate can slide in the groove, and the scraper abuts against the first plate. An air distribution hole is provided on the side wall of the housing corresponding to the second cavity. The air distribution hole is connected to a third pump body through a fifth pipe. The third pump body is used to pump air into the second cavity.

8. A boiler flue gas purification and treatment device, characterized in that, include: An evaporation system, wherein the evaporation system is the evaporation system according to any one of claims 1-7, and the first pipe of the evaporation system is connected to the flue gas pipe of the boiler; The desulfurization tower has its flue gas inlet connected to the boiler's exhaust pipe and / or the second pipe of the evaporation system, and its desulfurization wastewater discharge outlet connected to the pumping assembly of the evaporation system.

9. The boiler flue gas purification and treatment device according to claim 8, characterized in that, The following steps are included in its use: The flow rate of flue gas in the first pipeline is obtained, and the flow rate of desulfurized wastewater delivered to the first pipeline by the pumping component is adjusted so that the flue gas temperature in the first pipeline is at a first threshold. Adjust the air pressure inside the chamber to the second threshold; Adjust the flow rate of desulfurized wastewater delivered to the spray pipe by the pumping assembly so that the flue gas temperature in the second pipe is at the third threshold.

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