Flashing desulfurization wastewater zero discharge circulating treatment device based on glass steel pipeline

Abstract

The application discloses a flash evaporation desulfurization wastewater zero discharge circulating treatment device based on a glass steel pipeline, which comprises a flash tank and a heating evaporation tank, and a glass steel sleeve pipe is fixedly sleeved in the flash tank; the glass steel sleeve pipe is additionally arranged at the upper end of the flash tank based on the operation principle of the conventional flash tank, so that the original single flash evaporation space is divided into double flash evaporation spaces of an inner flash evaporation chamber and an outer flash evaporation chamber, and a stirring diffusion assembly driven and installed in rotation is additionally arranged in the inner flash evaporation chamber; the stirring diffusion assembly improves the diffusion degree of the desulfurization wastewater at the top of the inner flash evaporation chamber, slows down the falling speed of the desulfurization wastewater, improves the flash evaporation effect, and makes the desulfurization wastewater that is not evaporated in time in the inner flash evaporation chamber flow to the outer flash evaporation chamber and move downward through a flow distribution groove and a heat exchange gap; in the process, the hot air supplemented and diffused upward is used for secondary heating and evaporation of the desulfurization wastewater, so that the water in the desulfurization wastewater is evaporated again in the narrow heat exchange space, and the crystallization rate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial wastewater flash treatment, more particularly to a flash desulfurization wastewater zero-emission circulating treatment device based on a glass steel pipeline. BACKGROUND

[0002] Thermal power generation occupies an important position in the field of power production in China, and more than 90% of coal-fired power plants in China currently use limestone-gypsum wet flue gas desulfurization technology. In the wet flue gas desulfurization process, desulfurization wastewater is generated.

[0003] The current flash system is one of the mainstream processes for treating desulfurization wastewater. For example, patent No. CN108314119A discloses a desulfurization wastewater phase change flash crystallization zero-emission system and a desulfurization wastewater treatment method. The system uses boiler flue gas waste heat as a heat source to heat exchange the desulfurization wastewater, and then evaporates and concentrates the wastewater in a flash evaporator under negative pressure conditions. However, in the traditional flash system, the wastewater enters the flash tank from the upper part, and the wastewater introduced into the flash tank is rapidly partially evaporated to form water vapor, which immediately overflows from the liquid phase, taking away a large amount of latent heat. This simple straight-through water distribution method cannot achieve uniform distribution of the wastewater at the top of the flash tank under high-temperature conditions, and the liquid that does not form water vapor in time flows downward naturally under the action of gravity after gradually exchanging heat and cooling, resulting in a large amount of waste liquid being discharged, and the crystallization rate being reduced because part of the dissolved solids cannot be fully crystallized.

[0004] Therefore, we propose a flash desulfurization wastewater zero-emission circulating treatment device based on a glass steel pipeline to solve the actual problem. SUMMARY

[0005] The present application aims to solve the problem in the prior art that straight-through water distribution cannot achieve uniform distribution and diffusion at the top of the flash tank under high-temperature conditions, thereby reducing the flash effect, and provides a flash desulfurization wastewater zero-emission circulating treatment device based on a glass steel pipeline.

[0006] The purpose of the present application can be achieved by the following technical solution: a flash desulfurization wastewater zero-emission circulating treatment device based on a glass steel pipeline, comprising a flash tank and a heating evaporation tank for heating and treating desulfurization wastewater. The flash tank is provided with a liquid inlet pipe on one side of the upper end, and a steam discharge pipe is arranged at the top end of the flash tank. A glass steel sleeve is fixedly sleeved in the flash tank, and an inner flash chamber is formed in the glass steel sleeve. An outer flash chamber is formed between the outer wall of the glass steel sleeve and the inner wall of the flash tank. A dehumidifier is fixedly connected to the top end of the flash tank and communicates with the outer flash chamber and the inner flash chamber. A plurality of flow discharge ports are formed in the lower end wall of the glass steel sleeve and communicate with the inner flash chamber and the outer flash chamber.

[0007] The inner end of the liquid inlet pipe penetrates to the top end of the inner flash chamber and is fixed with a water distribution ring pipe. The lower end of the inner flash chamber is fixed with a water distribution cone located inside the multiple drainage ports. The water distribution cone is rotatably driven and mounted with an agitating diffusion assembly. The lower end of the outer flash chamber is sequentially distributed with a distribution table, a gas distribution ring pipe and a solid-liquid separation tank from top to bottom. The distribution table is located below the multiple drainage ports.

[0008] Further, an annular heat exchanger is installed inside the heating and evaporation tank. An air inlet pipe and an air outlet pipe connected with the annular heat exchanger are respectively installed at the upper and lower ends of the heating and evaporation tank. The air inlet pipe is connected with the flue gas exhaust pipe of the boiler. A water inlet pipe for introducing desulfurization wastewater is externally connected to the top end of the heating and evaporation tank. A water outlet pipe for discharging heated desulfurization wastewater and connected with the liquid inlet pipe is arranged at the bottom end of the heating and evaporation tank. The boiler flue gas waste heat is used as a heat source to heat treat the desulfurization wastewater, which is then introduced into the flash tank under negative pressure conditions for evaporation and concentration.

[0009] Further, the agitating diffusion assembly includes a stirring shaft rotatably installed on the water distribution cone. A water distribution cover is fixed to the upper end of the stirring shaft and located below the water distribution ring pipe. An overflow port is formed in the middle of the bottom end of the water distribution cover. An upper driving motor for rotatably driving the stirring shaft is installed in the bottom of the glass steel sleeve.

[0010] Further, the water distribution cover is a hollow conical structure with the opening facing upwards and the width narrowing from top to bottom. The water distribution cone is a conical structure with the width narrowing from top to bottom and the bottom edge connected and communicated with the drainage port. A plurality of scraping strips are fixed to the bottom end of the stirring shaft and movably attached to the outer wall of the water distribution cone.

[0011] Further, a plurality of downwardly arranged atomizing nozzles are installed on the water distribution ring pipe in an annular array manner with the center point of the flash tank. A plurality of upwardly arranged air injection nozzles are installed on the gas distribution ring pipe in an annular array manner with the center point of the tower body flash tank.

[0012] Further, a heating box connected with the gas distribution ring pipe is arranged outside the flash tank. The other end of the liquid inlet pipe is connected to the heating box. A shunt pipe is externally connected to the steam discharge pipe.

[0013] Further, a plurality of shunt grooves are formed on the distribution table in an interlaced distribution manner from inside to outside and penetrating from top to bottom. An annular heat exchange gap is reserved between the outer edge of the distribution table and the flash tank.

[0014] Further, a salt collection tank is formed inside the solid-liquid separation tank. A discharge hopper in communication with the inner bottom of the salt collection tank and a drainage pipe in communication with the inner bottom of the flash tank are respectively arranged on the bottom wall of the flash tank from top to bottom.

[0015] Further, a discharge port in communication with the discharge hopper is formed on one side of the bottom end of the salt collection tank. A raking blade is rotatably installed inside the salt collection tank. A lower driving motor for rotatably driving the raking blade is installed at the middle position of the solid-liquid separation tank.

[0016] Compared with the prior art, the present application has the advantages of:

[0017] (1) The present scheme is based on the operating principle of a conventional flash tank, a glass steel sleeve is additionally arranged at the upper end of the inside of the flash tank, so as to realize the separation of the original single flash space into the double flash space of the inner flash chamber and the outer flash chamber distributed inside and outside, and a stirring diffusion assembly driven by rotation is additionally arranged in the inner flash space, which on the one hand improves the diffusion degree of the desulfurization wastewater at the top of the inner flash chamber, and on the other hand is beneficial to slow down the falling speed of the desulfurization wastewater, and improve the flash effect, the desulfurization wastewater that is not evaporated in time from the inner flash chamber flows to the shunt table of the outer flash space, in this process, the hot gas diffused upward contacts the desulfurization wastewater, realizing secondary heating and evaporation, and improving the crystallization rate.

[0018] (2) The present scheme opens a plurality of shunt grooves distributed inside and outside alternately on the shunt table, and a ring-shaped heat exchange gap is reserved between the outer edge of the shunt table and the flash tank, the desulfurization wastewater that is not evaporated in time from the inner flash chamber flows along the inclined end face of the water distribution cone table and the drainage port to the shunt table, and moves downward through the plurality of shunt grooves and the heat exchange gap, at this time, the hot gas diffused upward at high speed from the plurality of air nozzles contacts the desulfurization wastewater, realizing the rapid evaporation of the water in the desulfurization wastewater again in the narrow heat exchange space. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 It is a sectional view of the flash tank of the present application;

[0021] Figure 3 It is a partial sectional view of the combination of the glass steel sleeve and the dehumidifier of the present application;

[0022] Figure 4 It is an internal sectional view of the glass steel sleeve of the present application;

[0023] Figure 5 It is a bottom view of the combination of the glass steel sleeve and the shunt table and the air distribution ring tube of the present application;

[0024] Figure 6 It is a schematic diagram of the structure of the solid-liquid separation tank of the present application;

[0025] Figure 7 It is a schematic diagram of the structure of the solid-liquid separation tank of the present application when discharging by using the discharging piece;

[0026] Figure 8 It is a sectional view of the present application when working.

[0027] Explanation of the reference numerals in the drawings:

[0028] 1, flash tank; 101, liquid inlet pipe; 102, steam exhaust pipe; 2, heating evaporation tank; 201, water inlet pipe; 202, water outlet pipe; 203, air inlet pipe; 204, air exhaust pipe; 3, glass steel sleeve; 301, drainage port; 4, water distribution ring pipe; 401, atomizing nozzle; 5, water distribution cone; 6, stirring shaft; 601, scraping strip; 7, water distribution cover; 8, dehumidifier; 9, distribution table; 901, distribution groove; 10, protective cover; 11, air distribution ring pipe; 111, air jet nozzle; 12, heating box; 13, distribution pipe; 14, solid-liquid separation tank; 141, salt collection tank; 142, discharge port; 15, stirring blade; 16, drainage pipe; 17, discharge hopper. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments; based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Embodiment 1: The present application discloses a flash desulfurization wastewater zero discharge circulating treatment device based on a glass steel pipeline, please refer to Figure 1 , which comprises a flash tank 1 and a heating evaporation tank 2 for heating treatment of desulfurization wastewater, the flash tank 1 is provided with a liquid inlet pipe 101 on one side of the upper end for heating desulfurization wastewater to pass in, and the flash tank 1 is provided with a steam exhaust pipe 102 at the top end.

[0031] The heating evaporation tank 2 is internally provided with an annular heat exchanger, and the heating evaporation tank 2 is provided with an air inlet pipe 203 and an air exhaust pipe 204 connected with the annular heat exchanger at the upper and lower ends respectively, the air inlet pipe 203 is connected with a boiler flue exhaust pipe, the heating evaporation tank 2 is externally connected with a water inlet pipe 201 at the top end for passing in desulfurization wastewater, and the heating evaporation tank 2 is provided with a water outlet pipe 202 at the bottom end for heating desulfurization wastewater to pass out and connected with the liquid inlet pipe 101, so that the boiler flue gas waste heat is used as a heat source to heat treat the desulfurization wastewater, then the desulfurization wastewater is passed into the flash tank 1 under negative pressure condition to evaporate and concentrate, and the water vapor obtained by evaporation is discharged by the steam exhaust pipe 102.

[0032] Please refer to Figure 2 , the flash tank 1 is internally provided with a glass steel sleeve 3, the glass steel sleeve 3 forms an inner flash chamber inside, and an outer flash chamber between the outer wall of the glass steel sleeve 3 and the inner wall of the flash tank 1, the flash tank 1 is fixedly provided with a dehumidifier 8 at the top end, which is in communication with the outer flash chamber and the inner flash chamber, and the lower end wall of the glass steel sleeve 3 is provided with a plurality of drainage ports 301 in communication with the inner flash chamber and the outer flash chamber.

[0033] Please refer to Figure 3 , Figure 4The inner end of the liquid inlet pipe 101 penetrates to the top end of the inner flash chamber and is fixed with a water distribution ring pipe 4. A plurality of downwardly arranged atomizing nozzles 401 are installed on the water distribution ring pipe 4 in an annular array manner with the center point of the flash tank 1. A water distribution cone 5 is fixed at the lower end of the inner flash chamber and is located inside the plurality of drainage ports 301. An agitating and diffusing assembly extending below the water distribution ring pipe 4 is rotatably driven and installed on the water distribution cone 5. The agitating and diffusing assembly includes a stirring shaft 6 rotatably installed on the water distribution cone 5. A water distribution cover 7 is fixed at the lower end of the stirring shaft 6 and is located below the water distribution ring pipe 4. An overflow port is formed at the middle position of the bottom end of the water distribution cover 7. An upper driving motor for rotating and driving the stirring shaft 6 is installed at the inner bottom of the glass steel sleeve pipe 3.

[0034] The water distribution cover 7 is a hollow conical structure with the opening upwardly arranged and the width of the upper part being wider than that of the lower part. The water distribution cone 5 is a conical structure with the width of the upper part being narrower than that of the lower part and the bottom edge being connected and communicated with the drainage port 301. A plurality of scraping strips 601 are fixed at the bottom end of the stirring shaft 6 and are movably attached to the outer wall of the water distribution cone 5. The desulfurization wastewater heated in the liquid inlet pipe 101 is introduced into the inner flash chamber. The desulfurization wastewater is sprayed downwardly by the plurality of atomizing nozzles 401 and is diffused by the water distribution cover 7.

[0035] On the one hand, the diffusion degree of the desulfurization wastewater at the top of the inner flash chamber is improved. On the other hand, the falling speed of the desulfurization wastewater is slowed down, the flash evaporation effect is improved, the water vapor evaporated once is dehumidified upwardly by the dehumidifier 8 and is discharged by the steam discharge pipe 102. The scraping strips 601 are additionally arranged to rotate synchronously. The water solution attached to the water distribution cone 5 is discharged outwardly to the drainage port 301 so as to prevent the residual water solution from being crystallized at the water distribution cone 5 at low temperature.

[0036] Please refer to Figure 2 and Figures 5-8 The lower end of the outer flash chamber is sequentially distributed from top to bottom with a flow distribution table 9, a gas distribution ring pipe 11 and a solid-liquid separation tank 14. The flow distribution table 9 is located below the plurality of drainage ports 301. The gas distribution ring pipe 11 is installed with a plurality of upwardly arranged air nozzles 111 in an annular array manner with the center point of the tower body flash tank 1. The desulfurization wastewater not evaporated in time in the inner flash chamber flows to the flow distribution table 9 of the outer flash chamber. In this process, the hot gas supplied and diffused upwardly contacts the desulfurization wastewater to realize secondary heating and evaporation. The water vapor evaporated twice is also dehumidified upwardly by the dehumidifier 8 and is discharged by the steam discharge pipe 102.

[0037] The solid-liquid separation tank 14 is internally provided with a salt collection tank 141. The bottom wall of the flash tank 1 is provided from top to bottom with a discharge hopper 17 communicated with the inner bottom of the salt collection tank 141 and a drainage pipe 16 communicated with the inner bottom of the flash tank 1. The last condensed water enters the salt collection tank 141 and is subjected to solid-liquid separation by the solid-liquid separation tank 14. The clean condensed water after separation is discharged by the drainage pipe 16. The crystalline body is retained in the salt collection tank 141 and is finally discharged by the discharge hopper 17.

[0038] In this embodiment, the secondary flash evaporation process is optimized based on the embodiment 1, and the specific process is as follows:

[0039] Please refer to Figure 5 A plurality of inner-outer staggered distribution and up-down through distribution grooves 901 are arranged on the distribution platform 9, and a ring-shaped heat exchange gap is reserved between the outer edge of the distribution platform 9 and the flash tank 1. A protective cover 10 is further fixed on the lower end wall of the glass fiber reinforced plastic sleeve 3 and located between the distribution platform 9 and the gas distribution ring pipe 11. The protective cover 10 is a tapered sleeve structure with a wide upper part and a narrow lower part.

[0040] A gas rising gap is reserved between the bottom end edge of the protective cover 10 and the flash tank 1. The desulfurization wastewater that is not evaporated in time in the inner flash evaporation chamber flows along the inclined end surface of the water distribution cone platform 5, the drainage port 301, and the distribution platform 9, and moves downward through the plurality of distribution grooves 901 and the heat exchange gap.

[0041] At this time, the hot gas moving upward from the plurality of air nozzles 111 diffuses to the lower part of the distribution platform 9 through the gas rising gap, fully contacts with the desulfurization wastewater, and heats the desulfurization wastewater again. The protective cover 10 plays a corrosion protection role on the gas distribution ring pipe 11 and the plurality of air nozzles 111. In this process, the water in the desulfurization wastewater is rapidly evaporated again in the narrow heat exchange space, the steam moves upward, and the condensed water is concentrated and gathered in the solid-liquid separation tank 14.

[0042] Please refer to Figures 6-8 A discharge port 142 is arranged on one side of the bottom end of the salt collection tank 141 and is connected with the discharge hopper 17. A dislodging piece 15 is rotatably installed in the salt collection tank 141. A lower driving motor is installed at the middle position of the solid-liquid separation tank 14 and is used to rotatably drive the dislodging piece 15. The dislodging piece 15 is a trapezoidal structure with a narrow upper part and a wide lower part, and the width of the bottom end of the dislodging piece 15 is greater than the width of the discharge port 142.

[0043] In the normal flash evaporation work, the dislodging piece 15 is located above the discharge port 142. When the crystallization amount in the salt collection tank 141 is large, the dislodging piece 15 is driven to rotate by the lower driving motor, the crystallization in the salt collection tank 141 is discharged through the discharge port 142, the deposition and scaling phenomenon of the wastewater in the tank is reduced, and the subsequent solid-liquid separation effect is improved.

[0044] The flash tank 1 is further provided with a heating box 12 connected with the gas distribution ring pipe 11. The other end of the liquid inlet pipe 101 is connected to the heating box 12. The steam discharge pipe 102 is further connected with a distribution pipe 13, directly connects the steam discharge pipe 102 with the heating box 12, and introduces the heated gas into the gas distribution ring pipe 11, so as to effectively recycle the water vapor.

[0045] A flow meter is additionally arranged at the steam exhaust pipe 102 and the communication position between the heating tank 12 and the gas distribution ring pipe 11 for monitoring the gas flow, and a shunt pipe 13 is additionally arranged at the end of the steam exhaust pipe 102, when the amount of the desulfurization waste water is certain, the amount of the heated gas discharged into the gas distribution ring pipe 11 by the heating tank 12 is certain, which is beneficial to determine the amount of the gas discharged by the shunt pipe 13 according to the actual amount of the gas discharged by the steam exhaust pipe 102, so as to ensure that the amount of the heated gas discharged into the gas distribution ring pipe 11 by the heating tank 12 is a constant value, and the heated gas discharged by the shunt pipe 13 can be used for preheating the desulfurization waste water or other heat energy recovery.

[0046] In summary: the scheme is based on the operation principle of the conventional flash tank, a glass steel sleeve 3 is additionally arranged at the upper end inside, the original single flash space is divided into the inner flash chamber and the outer flash chamber, and the stirring diffusion assembly driven and installed in rotation is additionally arranged in the inner flash space, which is beneficial to improve the diffusion degree of the desulfurization waste water at the top of the inner flash chamber and slow down the falling speed of the desulfurization waste water, and improve the flash effect;

[0047] The desulfurization waste water not evaporated in time in the inner flash chamber moves to the outer flash chamber and moves downward through the multiple shunt grooves and the heat exchange gaps, in this process, the heated gas diffused upward contacts the desulfurization waste water and is heated and evaporated again, so that the water in the desulfurization waste water is evaporated again in the narrow heat exchange space, and the crystallization rate is improved;

[0048] It should be noted that, in order to improve the corrosion resistance of the flash tank 3, the inner sleeve of the flash tank 3, the glass steel sleeve 3 and other tubular structures inside the flash tank 3 can be made of glass steel according to actual needs, the glass steel has excellent chemical corrosion resistance and low thermal conductivity, which can resist the corrosion of various acids, alkalis, salts and organic solvents, prolong the service life of the equipment, and help to maintain the stability of the temperature in the flash process, improve the evaporation efficiency, and perform well in the treatment of corrosive waste water.

[0049] The above; only for the preferred specific embodiments of the present application; but the protection scope of the present application is not limited to this; any skilled person in the art within the technical scope disclosed by the present application; according to the technical scheme and the improvement concept of the present application; equivalent replacement or change; should be covered in the protection scope of the present application.

Claims

1. A flash desulfurization wastewater zero discharge circulating treatment device based on a glass steel pipeline, comprising a flash tank (1) and a heating evaporation tank (2) for heating treatment of desulfurization wastewater, the flash tank (1) is provided with a liquid inlet pipe (101) and a steam discharge pipe (102), characterized in that: The flash tank (1) is internally fixed with a glass steel sleeve (3), the glass steel sleeve (3) forms an inner flash chamber, and the outer flash chamber is formed between the outer wall of the glass steel sleeve (3) and the inner wall of the flash tank (1); the top end of the flash tank (1) is fixed with a dehumidifier (8) which is connected with the outer flash chamber and the inner flash chamber; the lower end wall of the glass steel sleeve (3) is provided with a plurality of drainage ports (301) which are connected with the inner flash chamber and the outer flash chamber; The inner end of the liquid inlet pipe (101) penetrates to the top end of the inner flash chamber and is fixed with a water distribution ring pipe (4); the lower end of the inner flash chamber is fixed with a water distribution cone (5) which is located inside the plurality of drainage ports (301); the water distribution cone (5) is rotatably driven and mounted with an agitation and diffusion assembly; the lower end of the outer flash chamber is sequentially provided from top to bottom with a flow distribution table (9), a gas distribution ring pipe (11) and a solid-liquid separation tank (14); the flow distribution table (9) is located below the plurality of drainage ports (301). The agitation and diffusion assembly comprises a stirring shaft (6) which is rotatably mounted on the water distribution cone (5); the upper end of the stirring shaft (6) is fixed with a water distribution cover (7) which is located below the water distribution ring pipe (4); the bottom end of the water distribution cover (7) is provided with an overflow port; the water distribution cover (7) is a hollow conical structure which is arranged with the opening facing upward and is wide at the top and narrow at the bottom; the water distribution cone (5) is a conical structure which is narrow at the top and wide at the bottom and the bottom edge is connected with the drainage port (301); the bottom end of the stirring shaft (6) is fixed with a plurality of scraping strips (601) which are movably attached to the outer wall of the water distribution cone (5).

2. The glass steel pipe based flash desulfurization wastewater zero discharge circulating treatment device according to claim 1, characterized in that: The heating and evaporation tank (2) is internally provided with an annular heat exchanger; the upper and lower ends of the heating and evaporation tank (2) are respectively provided with an air inlet pipe (203) and an air outlet pipe (204) which are connected with the annular heat exchanger; the air inlet pipe (203) is connected with the flue gas exhaust pipe of the boiler; the top end of the heating and evaporation tank (2) is externally connected with a water inlet pipe (201) for introducing desulfurization wastewater; the bottom end of the heating and evaporation tank (2) is provided with a water outlet pipe (202) for discharging heated desulfurization wastewater and is connected with the liquid inlet pipe (101).

3. The glass steel pipe based flash desulfurization wastewater zero discharge circulating treatment device according to claim 1, characterized in that: A plurality of downwardly arranged atomizing nozzles (401) are annularly arranged on the water distribution ring pipe (4) with the center point of the flash tank (1) as the center; a plurality of upwardly arranged air injection nozzles (111) are annularly arranged on the gas distribution ring pipe (11) with the center point of the tower body flash tank (1) as the center.

4. The glass steel pipe based flash desulfurization wastewater zero discharge circulating treatment device according to claim 3, characterized in that: The flash tank (1) is further provided with a heating box (12) which is connected with the gas distribution ring pipe (11); the other end of the liquid inlet pipe (101) is connected with the heating box (12); and the steam exhaust pipe (102) is further externally connected with a flow distribution pipe (13).

5. The glass steel pipe based flash desulfurization wastewater zero discharge circulating treatment device according to claim 1, characterized in that: A plurality of flow distribution grooves (901) which are arranged in an inner-outer staggered manner and penetrate upward and downward are formed in the flow distribution table (9); and an annular heat exchange gap is reserved between the outer edge of the flow distribution table (9) and the flash tank (1).

6. The glass steel pipe based flash desulfurization wastewater zero discharge circulating treatment device according to claim 1, characterized in that: The solid-liquid separation tank (14) is internally provided with a salt collection tank (141); the bottom end wall of the flash tank (1) is provided from top to bottom with a discharge hopper (17) which is connected with the inner bottom of the salt collection tank (141) and a drainage pipe (16) which is connected with the inner bottom of the flash tank (1).

7. The glass steel pipe based flash desulfurization wastewater zero discharge circulating treatment device according to claim 6, characterized in that: The salt collecting groove (141) is provided with a discharge opening (142) at one side of the bottom end, which is communicated with the discharge hopper (17), and the salt collecting groove (141) is internally rotatably provided with a raking piece (15).

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