Crystallization system and crystallization method for desulfurization wastewater solidification

Abstract

The invention provides a crystallization system and a crystallization method for curing desulfurization wastewater. The crystallization system comprises a crystallizer, a high-pressure bypass pipeline, a flue gas pipeline, a liquid inlet unit, a compressed air inlet unit and an ash discharge unit; the crystallizer comprises a steam feeding valve and a tower body, the tower body comprises an inner tower body and an outer tower body, and a steam channel is formed between the inner tower body and the outer tower body; the steam feeding valve is arranged at the top of the tower body; a steam inlet and a steam outlet are respectively connected to the high-pressure bypass pipeline and the steam channel; the liquid inlet unit is connected to the desulfurization wastewater inlet, the compressed air inlet unit is connected to the compressed air inlet, and the ash discharge unit is connected to the ash discharge port; a flue gas uniform distribution area, a dry spraying area, a particle crushing area and a cyclone separation area are sequentially arranged in the inner tower body from top to bottom; and the crystallizer is provided with a flue gas inlet, a feeding pipe, a spray gun, a rotary crushing structure and a cyclone separation structure corresponding to each area. According to the crystallization system and the crystallization method, energy of high-pressure wet steam is transferred and recycled by coupling a high-pressure bypass pipeline.

Description

Technical Field

[0001] This invention belongs to the field of desulfurization wastewater treatment engineering, and specifically relates to a crystallization system and crystallization method for solidifying desulfurization wastewater. Background Technology

[0002] Currently, the standards for wastewater discharge are very stringent. Power plants, as major water and wastewater users, account for 20% of total industrial water consumption. From multiple perspectives, cascade utilization, concentration and reduction, and water conservation are of great significance for power plants to achieve zero discharge of desulfurization wastewater. With the increasing national standards for wastewater discharge in the environmental protection industry, zero-discharge treatment of desulfurization wastewater is urgently needed.

[0003] When a coal-fired power plant unit starts up, high-pressure wet steam from the boiler needs to be discharged through the high-pressure bypass valve of the high-pressure bypass system to prevent damage to the turbine from the high-temperature, high-pressure steam. The high-pressure bypass system is mainly used to protect the safe operation of the turbine and boiler during unit startup, shutdown, or abnormal situations. When the unit load decreases or a boiler malfunction causes a reduction in steam flow, the high-pressure bypass opens, directing excess steam directly from the high-pressure cylinder inlet to the reheater inlet or condenser to prevent turbine overspeed or overheating. Additionally, the high-pressure bypass can also be used to regulate the unit load, improving the unit's flexibility and stability. However, current high-pressure bypass technology typically introduces spray water to lower the temperature of the high-pressure steam. A large amount of spray water is vaporized within the high-pressure bypass valve, further reducing the temperature of the wet steam, thus significantly wasting the energy of the high-pressure steam.

[0004] Currently, when crystallizers used for desulfurization wastewater are started up, the high-temperature flue gas (usually above 300 ℃) from the crystallizer inlet "warms" the crystallizer and is directly discharged from the bottom of the crystallizer into the bag filter. However, the temperature tolerance of the bag filter bags is usually no higher than 190 ℃. Such a high flue gas temperature poses a great risk to the safe use of the bag filter bags. Existing technologies often solve this problem by introducing cold air, resulting in energy waste.

[0005] Currently, there are no reports of effective solutions to the aforementioned technical problems. Summary of the Invention

[0006] The first objective of this invention is to provide a crystallization system for solidifying desulfurization wastewater, which can solve at least one of the aforementioned technical problems; A second objective of this invention is to provide a crystallization method for solidifying desulfurization wastewater using the aforementioned crystallization system.

[0007] To achieve the first objective of this invention, the following technical solution is adopted: A crystallization system for solidifying desulfurization wastewater includes a crystallizer, a high-pressure bypass pipeline from a boiler in a coal-fired power plant unit, a liquid inlet unit, a flue gas pipeline from the boiler in the coal-fired power plant unit, a compressed air inlet unit, and an ash discharge unit connected in series; wherein, The crystallizer includes a steam feed valve and a tower body; the tower body includes an inner tower body and an outer tower body, which are spaced apart to form a steam channel. The steam feed valve is located at the top of the tower body, and its steam inlet is connected to the high-pressure bypass pipeline of the boiler in the coal-fired power plant unit, and its steam outlet is connected to the steam channel. It is used to control the steam from the high-pressure bypass pipeline to be introduced into the steam channel to provide heat and form cooling steam when the tower is heated. The lower part of the outer tower body is provided with a cooling steam outlet for outputting the cooling steam from the steam channel. The inner tower body is arranged from top to bottom as follows: a flue gas distribution zone, a drying spray zone, a particle crushing zone, and a cyclone separation zone; wherein, The crystallizer is equipped with a feed pipe and a spray gun corresponding to the drying spray zone. The feed pipe has an inner channel and an outer channel. The inner channel has a desulfurization wastewater inlet, and the outer channel has a compressed air inlet. The compressed air inlet is connected to the compressed air intake unit, and the desulfurization wastewater inlet is connected to the liquid inlet unit, for introducing desulfurization wastewater and compressed air into the drying spray zone, respectively. The spray gun is connected to the feed pipe and is used to introduce compressed air and desulfurization wastewater from the feed pipe to atomize the desulfurization wastewater into desulfurization wastewater droplets for spraying out. The crystallizer is provided with a flue gas inlet at the upper part of the flue gas uniform distribution area, and is connected to the flue gas pipeline of the boiler in the coal-fired power plant unit through the flue gas inlet. It is used to sequentially introduce flue gas from the flue gas pipeline into the flue gas uniform distribution area and the drying spray area, so as to use the heat of the flue gas in the drying spray area to evaporate and solidify the desulfurization wastewater droplets to generate ash particles, and output cooling flue gas. The crystallizer is equipped with a rotary crushing structure in the particle crushing zone to crush ash particles from the drying spray zone into ash powder. The crystallizer has a cooling flue gas outlet at the upper part and an ash discharge port at the bottom corresponding to the cyclone separation zone, and is connected to the ash discharge unit through the ash discharge port; the cyclone separation zone is provided with a cyclone separation structure, and its inlet is connected to the discharge port of the particle crushing zone, for cyclone separation of ash powder and cooling flue gas from the particle crushing zone, and outputs cooling flue gas from the cooling flue gas outlet and ash powder from the ash discharge port to the ash discharge unit.

[0008] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a liquid inlet unit comprising a desulfurization wastewater raw material tank and a liquid inlet pipeline. The inlet end of the liquid inlet pipeline is connected to the lower part of the desulfurization wastewater raw material tank, and the outlet end is connected to the desulfurization wastewater inlet. A feed pump is provided on the liquid inlet pipeline.

[0009] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a liquid inlet unit further comprising a circulation return pipeline, wherein the inlet end of the circulation return pipeline is connected to the outlet end of the feed pump and the outlet end is connected to the top inlet of the desulfurization wastewater raw material tank.

[0010] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a compressed air intake unit comprising a dry air compressor and a dry compressed air storage tank connected in series, wherein the dry compressed air storage tank is connected to the compressed air inlet via a compressed air intake pipeline.

[0011] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a bypass discharge port near the ash discharge port in the crystallizer. The ash discharge unit includes a silo pump and an ash warehouse connected by pipelines; the silo pump includes a side balance exhaust port and a top feed port, the side balance exhaust port is connected to the bypass discharge port via a balance air pipeline to exhaust the silo pump, and the top feed port is connected to the ash discharge port via a discharge pipeline to receive ash powder from the crystallizer.

[0012] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes an ash discharge unit that further includes an ash discharge pipeline. The feed end of the ash discharge pipeline is connected to a balance gas pipeline, and the discharge end is connected to the ash warehouse. This pipeline is used to directly send the ash powder from the crystallizer to the ash warehouse when the warehouse pump fails.

[0013] The crystallization system for solidifying desulfurization wastewater of the present invention preferably further includes a soot blowing unit, which includes a soot blowing air compressor and a soot blowing compressed air storage tank connected by pipelines. The soot blowing compressed air storage tank is connected to the silo pump through a soot blowing pipeline for supplying soot blowing compressed air to the silo pump for soot blowing. Preferably, the silo pump is provided with a first soot blowing port, a second soot blowing port, and a third soot blowing port at its upper, lower, and bottom parts, respectively. The outlet end of the soot blowing pipeline branches into three branches, which are respectively connected to the first soot blowing port, the second soot blowing port, and the third soot blowing port. Preferably, the ash conveying pipeline from the silo pump to the ash warehouse is also provided with the air replenishment ring, and the air aid pipeline is provided from the inlet end of the soot blowing pipeline to the air replenishment ring for supplying soot blowing compressed air to the ash conveying pipeline for air aiding blowing.

[0014] In the crystallization system for solidifying desulfurization wastewater of the present invention, preferably, the steam feed valve is a hydraulic valve; The crystallization system further includes a hydraulic control unit, which includes an oil tank and an oil pump connected by pipelines, as well as a first solenoid valve. The oil pump's outlet is connected to the telescopic end within the hydraulic structure of the steam feed valve via a first oil supply pipeline. The hydraulic cylinder end within the hydraulic structure of the steam feed valve is connected to the oil tank via a first return oil pipeline. The first solenoid valve is positioned on the first oil supply pipeline and the first return oil pipeline near the steam feed valve, and is used to control the flow of hydraulic oil within the hydraulic structure of the steam feed valve, thereby controlling the opening degree of the steam feed valve.

[0015] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a hydraulic control unit further comprising a throttle valve disposed at the inlet end of the first oil pipeline; the hydraulic control unit further comprises an overflow pipeline, the inlet and outlet ends of which are respectively connected to the inlet end of the throttle valve and the oil tank, and an overflow valve is disposed thereon for hydraulic oil return.

[0016] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a flue gas equalization component at the bottom of the crystallizer corresponding to the flue gas equalization zone. The flue gas equalization component is coaxially disposed in the inner tower body and fixed to the inner wall of the inner tower body by its edge, and is used to evenly distribute the flue gas entering the flue gas equalization zone and then output it to the drying spray zone.

[0017] The crystallization system for solidifying desulfurization wastewater according to the present invention preferably includes a flue gas uniform distribution component comprising a first uniform distribution disk and a second uniform distribution disk coaxial with the tower body and spaced apart, wherein the first uniform distribution disk and the second uniform distribution disk are respectively fixed to the inner wall of the inner tower body by their edges; the first uniform distribution disk is provided with a first uniform distribution hole and the second uniform distribution disk is provided with a second uniform distribution hole, wherein the first uniform distribution hole and the second uniform distribution hole are staggered.

[0018] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes, in the crystallizer, the spray gun in the drying spray zone includes an elbow and a spray gun assembly; the elbow includes an inner elbow and an outer elbow spaced apart to form an inner bend channel and an outer bend channel, and the inner bend channel is connected to the inner channel of the feed pipe for introducing desulfurization wastewater, and the outer bend channel is connected to the outer channel of the feed pipe for introducing compressed air.

[0019] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a spray gun assembly comprising a housing, and a swirl feeding assembly, a swirl atomizing assembly, and a spraying assembly arranged sequentially from top to bottom within the housing, forming a feeding section, an atomizing section, and a spraying section connected sequentially from top to bottom within the housing, for sequentially feeding desulfurization wastewater and compressed air, atomizing the desulfurization wastewater to form desulfurization wastewater droplets, and spraying out the desulfurization wastewater droplets.

[0020] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes an inner shell, a swirling component, a first baffle plate, and a second baffle plate. The gap between the inner shell and the outer shell forms a first inner flow channel and a first outer flow channel. The first inner flow channel is connected to the inner bend channel of the elbow, and the first outer flow channel is connected to the outer bend channel of the elbow, for respectively introducing desulfurization wastewater and compressed air to the atomization section. The swirling component is disposed at the bottom of the inner shell and is provided with swirling holes. The inlet of the swirling holes is located at the top of the swirling component and is connected to the first inner flow channel. The outlet of the swirling holes is located at the bottom of the swirling component and is connected to the rotary atomizing assembly. It is used to swirl the desulfurization wastewater from the inner curved channel through the first inner flow channel and the swirling holes into the rotary atomizing assembly. The first baffle plate is sleeved on the upper end of the swirl component, and the second baffle plate is sleeved on the lower end of the swirl component; the first baffle plate and the second baffle plate are arranged in parallel and are respectively fixed to the inner wall of the housing through their outer edges; the first baffle plate is provided with a first baffle hole, and the second baffle plate is provided with a second baffle hole, and the first baffle hole and the second baffle hole are staggered to allow compressed air from the outer curved channel to be introduced into the swirl cutting atomizing component in sequence through the first outer flow channel, the first baffle hole and the second baffle hole.

[0021] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a rotary cutting atomizing component comprising an atomizing cylinder, an isolation disk, and a rotary cutting structure; The top of the atomizing cylinder is fixed to the bottom of the swirling component and communicates with the swirling hole. The bottom of the atomizing cylinder is provided with a bottom plate to form a swirling atomization space. The rotary cutting structure is coaxially arranged inside the atomizing cylinder, with its first end fixed to the bottom of the swirling component and its second end fixed to the top of the base plate, for rotary cutting the incoming desulfurization wastewater to form a desulfurization wastewater cone-shaped plate; The isolation disc is sleeved on the outside of the atomizing cylinder and fixed to the inner wall of the housing by its outer edge, dividing the atomizing cylinder into a connected upper cylinder and a lower cylinder. The upper cylinder has an air inlet hole on its wall to allow compressed air from the feeding section to be introduced into the atomizing cylinder to atomize the formed desulfurization wastewater conical plate into desulfurization wastewater droplets. The lower cylinder has a mist outlet slit on its wall to output the desulfurization wastewater droplets from the atomizing cylinder.

[0022] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a spray assembly comprising a spray cylinder, the spray cylinder being fixed to the bottom of a base plate via its top; a housing being connected to the outer wall of the spray cylinder via a first truncated conical housing, dividing the spray cylinder into a connected upper spray cylinder and a lower spray cylinder; the outer wall of the upper spray cylinder, the first truncated conical housing, the housing, and the rotary atomizing assembly forming a first space for receiving desulfurization wastewater droplets from the lower cylinder; and a spray hole being provided on the cylinder wall of the upper spray cylinder for spraying desulfurization wastewater droplets from the first space into the spray cylinder and out from its bottom nozzle.

[0023] The crystallization system for solidifying desulfurization wastewater of the present invention, preferably, in the crystallizer, The spray gun assembly is further provided with an outer shell at the position corresponding to the atomizing section, and the outer shell is fitted onto the housing to form a first external spray slit. The spray gun assembly is further provided with an outer spray cylinder and a third truncated conical shell at the position corresponding to the spray section. The outer spray cylinder is gapped in the middle of the lower spray cylinder, and the third truncated conical shell is gapped in the first truncated conical shell, forming a second outer spray slit. The top of the outer shell is connected to the lower outer wall of the shell corresponding to the feeding section via a second truncated conical shell, and the bottom is connected to the outer spray cylinder via a third truncated conical shell, for connecting the first outer spray slit and the second outer spray slit; The housing is provided with a protective air hole at the position corresponding to the second truncated cone housing, for the compressed air introduced through the first external flow channel to be sprayed out sequentially through the first external spray slit and the second external spray slit.

[0024] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a partition plate in the crystallizer corresponding to the particle crushing zone, and the rotary crushing structure is fixed on the top surface of the partition plate; the partition plate is fixed to the inner wall of the inner tower body by its edge, and has a discharge port thereon for crushing ash particles from the drying spray zone to form ash powder for output.

[0025] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes a rotary crushing structure comprising a fixed frame and a rotating component; The fixing frame includes support columns, a fixing disk, and a fixing ring plate; the fixing disk has a fixing hole at its center for fixing the rotating component; there are at least three support columns, which are arranged in a ring around the bottom edge of the fixing disk to support the fixing disk; the fixing ring plate is fixed to the top edge of the fixing disk by its bottom ring edge, and its top ring edge forms a feed inlet for feeding ash particles; the fixing ring plate has ash discharge holes on its wall for outputting the ash powder obtained after crushing the ash particles; The rotating component includes a drive motor, a drive shaft, a rotating disk, and blades; the drive shaft passes through the fixing hole onto the fixed disk, with its bottom end fixed to the drive motor and its top end fixed to the bottom of the rotating disk, for driving the rotating disk to rotate using the drive motor; there are at least two blades, which are respectively arranged radially around the upper surface of the rotating disk for rotary cutting and crushing the incoming ash particles.

[0026] The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes, in the crystallizer, a cyclone separation structure in the cyclone separation zone comprising a cyclone separator corresponding to the discharge port; the cyclone separator comprises a feed pipe, a flue gas outlet pipe, and an ash outlet; the feed pipe is disposed on its side wall and connected to the discharge port of the particle crushing zone, for introducing ash powder along with the flue gas to perform cyclone separation of flue gas and ash powder; one end of the flue gas outlet pipe is disposed at its top, and the other end passes through the inner tower body and the outer tower body in sequence and connects to the cooling flue gas outlet, for discharging the separated flue gas; the ash outlet is disposed at its bottom and connects to the ash discharge port, for discharging the separated ash powder; The crystallization system for solidifying desulfurization wastewater of the present invention preferably includes an annular flue along the circumference of the outer tower body at a position corresponding to the cyclone separator, and the cooling flue gas outlet is located on the annular flue; the flue gas outlet pipe is located inside the annular flue at the point of exiting the outer tower body, and is used to concentrate the separated flue gas through the annular flue and then output it through the cooling flue gas outlet.

[0027] The crystallization system for solidifying desulfurization wastewater of the present invention further includes a distributor in the cyclone separation zone. The distributor is an inverted funnel-shaped distributor with its handle fixed to the middle of the bottom surface of the partition and its bucket extending to the bottom of the cyclone separator, for guiding and distributing ash powder from the cyclone separator.

[0028] To achieve the second objective of the present invention, a crystallization method for solidifying desulfurization wastewater using the aforementioned crystallization system is also provided.

[0029] The beneficial effects of this invention are as follows: (1) The crystallization system and method for solidifying desulfurization wastewater of the present invention connects the high-pressure bypass pipeline of the boiler in the coal-fired power plant unit to the steam channel via a steam feed valve (or directly the bypass valve of the high-pressure bypass pipeline), thereby coupling the high-pressure bypass pipeline to the crystallizer. The huge tower body of the crystallizer (usually with a diameter of 8 meters or more and a height of more than 10 meters) is used to cool the high-pressure wet steam from the high-pressure bypass pipeline, thereby realizing the transfer of energy of the high-pressure wet steam. The heat energy of the high-pressure wet steam is transferred to the tower body of the crystallizer, which greatly increases the tower body temperature. At the same time, it solves the problem that when the crystallizer is started up, the high-temperature flue gas (usually above 300°C) from the crystallizer inlet "warms" the crystallizer and is directly discharged from the bottom of the crystallizer into the bag filter, causing the filter bags to burn out. Since the temperature tolerance of the filter bags of the bag filter is usually no higher than 190°C, such a high flue gas temperature poses a great risk to the safe use of the filter bags of the bag filter. The existing technology often solves this problem by introducing cold air. This application's crystallizer eliminates the need for "tower warming" with high-temperature flue gas. Instead, it uses steam from a high-pressure bypass pipeline for tower warming, significantly reducing the risk of damage to the filter bags inside the baghouse dust collector caused by high-temperature flue gas. Therefore, this crystallizer fully realizes the energy transfer and reuse of high-pressure wet steam from the high-pressure bypass pipeline of the power plant boiler, solving the problem of damage to the filter bags inside the baghouse dust collector caused by tower warming in existing projects.

[0030] (2) The crystallization system and crystallization method for desulfurization wastewater evaporation of the present invention, in the crystallizer, through the dual-channel arrangement of the spray gun assembly in the drying spray zone, the desulfurization wastewater is formed into a swirling flow by its swirling component and enters the atomization section, and is swirled and atomized by the swirling atomizing component of the atomization section. The swirling desulfurization wastewater is cut into thin conical pieces by high-speed contact with the swirling atomizing component, namely desulfurization wastewater conical pieces. The desulfurization wastewater conical pieces collide with the compressed air flow in the atomization section and are atomized to form desulfurization wastewater droplets. When the desulfurization wastewater is cut and atomized by the rotary cutting and atomizing component, the desulfurization wastewater is deflected outward by the upstream surface of the spiral slice in the rotary cutting structure into a thin conical slice. At the same time, the compressed air that enters after two turbulences collides with the desulfurization wastewater conical slice at high speed and in a turbulent state, causing the desulfurization wastewater conical slice to be atomized by the compressed air to form desulfurization wastewater droplets.

[0031] (3) The crystallization system and crystallization method for desulfurization wastewater evaporation of the present invention, in the crystallizer, by setting a rotary crushing structure in the particle crushing zone, the centrifugal force generated by the blades when the rotating parts rotate at high speed is used to draw ash particles from the drying spray zone into the rotating disk, so that they become ash powder under the cutting of the high-speed rotating blades, and are discharged from the ash discharge hole on the fixed ring plate, and enter the cyclone separation zone with the flue gas under the action of flue gas flow.

[0032] (4) In the current crystallization system of engineering projects, most of the solidified dry ash enters the bag filter with the flue gas, where it is intercepted and turned into dry ash. Dry ash is currently a building material on the market. However, chloride ions and various heavy metal ions in the desulfurization wastewater enter the bag filter with the dry ash, which poses a potential danger to the environmentally friendly use of building materials in the future. The crystallization system and method for desulfurization wastewater evaporation of the present invention, through a built-in cyclone separation structure in the crystallizer, separates flue gas from ash. The discharged flue gas does not carry harmful substances from the desulfurization wastewater, and is therefore clean flue gas, thus not affecting the dry ash quality of the bag filter in the coal-fired power plant. The ash discharged from the bottom of this device can be collected separately and processed into solid building materials such as paving bricks for sidewalks.

[0033] (5) The crystallization system and crystallization method for solidifying desulfurization wastewater of the present invention, by coupling the high-pressure bypass pipeline of the boiler in the coal-fired power plant unit and setting up the liquid inlet unit, the flue gas pipeline of the boiler in the coal-fired power plant unit, the compressed air inlet unit and the ash discharge unit, can effectively realize the solidification and separation of desulfurization wastewater on the basis of realizing the transfer of steam energy in the high-pressure bypass pipeline.

[0034] (6) The crystallization system and crystallization method for solidifying desulfurization wastewater of the present invention can control the opening of the steam feed valve and adjust the steam feed flow rate by setting a hydraulic control unit. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the crystallization system for solidifying desulfurization wastewater according to one embodiment of the present invention.

[0036] Figure 2 This is a partially cross-sectional three-dimensional structural diagram of the crystallizer in a crystallization system for solidifying desulfurization wastewater according to one embodiment of the present invention.

[0037] Figure 3 This is a partially cross-sectional three-dimensional structural diagram of the spray gun of the crystallizer in the crystallization system for solidifying desulfurization wastewater according to one embodiment of the present invention.

[0038] Figure 4 This is a three-dimensional structural schematic diagram of the rotary crushing structure of the crystallizer in the crystallization system for solidifying desulfurization wastewater according to the present invention, in another embodiment.

[0039] Figure 5 This is a three-dimensional structural schematic diagram of the fixing frame of the rotary crushing structure in the crystallizer of the crystallizer in the crystallization system for solidification of desulfurization wastewater of the present invention.

[0040] Figure 6This is a three-dimensional structural schematic diagram of the rotating component of the rotary crushing structure in the crystallizer of the crystallizer in the crystallization system for solidifying desulfurization wastewater according to the present invention.

[0041] Figure 7 This is a schematic diagram of the combined structure of the partition plate and cyclone separation structure of the crystallizer in the crystallization system for solidification of desulfurization wastewater according to one embodiment of the present invention.

[0042] Figure 8 This is a schematic diagram of the flue gas distribution component of the crystallizer in the crystallization system for solidifying desulfurization wastewater according to one embodiment of the present invention.

[0043] Figure 9 This is a schematic diagram of the swirling component in the swirling feed assembly of the crystallizer in the crystallization system for solidifying desulfurization wastewater according to the present invention, in one embodiment. Detailed Implementation

[0044] The technical solution and its effects of the present invention will be further described below with reference to specific embodiments / examples. The following embodiments / examples are only for illustrating the content of the present invention, and the invention is not limited to the following embodiments or examples. Simple modifications made to the present invention based on the concept of the present invention are all within the scope of protection claimed by the present invention.

[0045] like Figure 1-9 As shown, a crystallization system for solidifying desulfurization wastewater includes a crystallizer S1, a high-pressure bypass pipeline S2 from the boiler in a coal-fired power plant unit, a liquid inlet unit S3, a flue gas pipeline S4 from the boiler in the coal-fired power plant unit, a compressed air inlet unit S5, and an ash discharge unit S6 connected to each other; wherein, The crystallizer S1 includes a steam feed valve 3 and a tower body; the tower body includes an inner tower body 1 and an outer tower body 2, which are spaced apart to form a steam channel. The steam feed valve 3 is located at the top of the tower body, and its steam inlet 301 is connected to the high-pressure bypass pipeline S2 of the boiler in the coal-fired power plant unit, and its steam outlet is connected to the steam channel. It is used to control the steam from the high-pressure bypass pipeline S2 to be introduced into the steam channel to provide heat and form cooling steam when the tower is heated. The lower part of the outer tower body 2 is provided with a cooling steam outlet 101 for outputting the cooling steam from the steam channel. The inner tower body 1 is provided with, from top to bottom, a connected flue gas distribution zone, a drying spray zone, a particle crushing zone, and a cyclone separation zone; wherein, The crystallizer S1 is equipped with a feed pipe 5 and a spray gun 6 corresponding to the drying spray zone. The feed pipe 5 has an inner channel and an outer channel. The inner channel has a desulfurization wastewater inlet 103, and the outer channel has a compressed air inlet 111. The compressed air inlet 111 is connected to the compressed air intake unit S5, and the desulfurization wastewater inlet 103 is connected to the liquid inlet unit S3, for introducing desulfurization wastewater and compressed air into the drying spray zone, respectively. The spray gun 6 is connected to the feed pipe 5 and is used to introduce compressed air and desulfurization wastewater from the feed pipe 5 to atomize the desulfurization wastewater into desulfurization wastewater droplets for spraying out. The crystallizer S1 is provided with a flue gas inlet 102 at the upper part of the flue gas uniform distribution area, and is connected to the flue gas pipeline S4 of the boiler in the coal-fired power plant unit through the flue gas inlet 102. The flue gas from the flue gas pipeline S4 is introduced into the flue gas uniform distribution area and the drying spray area in sequence, so as to use the heat of the flue gas in the drying spray area to evaporate and solidify the desulfurization wastewater droplets to generate ash particles, and output the cooled flue gas. The crystallizer S1 is provided with a rotary crushing structure 10 in the corresponding particle crushing zone, which is used to crush the ash particles from the drying spray zone to form ash powder. The crystallizer S1 has a cooling flue gas outlet 104 at the upper part and an ash discharge port 105 at the bottom in the cyclone separation zone, and is connected to the ash discharge unit S6 through the ash discharge port 105; the cyclone separation zone is provided with a cyclone separation structure, and its inlet is connected to the discharge port of the particle crushing zone, for cyclone separation of ash powder and cooling flue gas from the particle crushing zone, and outputting cooling flue gas from the cooling flue gas outlet 104 and ash powder from the ash discharge port 105 to the ash discharge unit S6.

[0046] In this invention, the steam temperature from the high-pressure bypass line S2 of the boiler in the coal-fired power plant unit is 530-550℃, and the pressure is approximately 20 MPa (20±2 MPa). The flue gas temperature from the boiler in the coal-fired power plant unit is 300-350℃. The steam temperature output from the cooling steam outlet 101 of the crystallizer S1 of this invention is approximately 300℃ (300±10℃), and the pressure is approximately 4 MPa (4±1 MPa). The flue gas temperature output from the cooling flue gas outlet 104 of the crystallizer S1 of this invention is 160-180℃.

[0047] In one embodiment, the steam feed valve 3 is a bypass valve on the high-pressure bypass pipeline S2 of the boiler in a coal-fired power plant unit.

[0048] Those skilled in the art will understand that the steam feed valve can be a newly installed bypass valve on the high-pressure bypass line S2 of the boiler in a coal-fired power plant unit, or it can be an existing bypass valve on the high-pressure bypass line S2 of the boiler in a coal-fired power plant unit.

[0049] Those skilled in the art understand that during the startup of a coal-fired power plant unit, high-pressure wet steam from the boiler needs to be discharged through the high-pressure bypass valve of the high-pressure bypass line S2 to prevent damage to the turbine from the high-temperature, high-pressure steam. The high-pressure bypass line S2 is mainly used to protect the safe operation of the turbine and boiler during unit startup, shutdown, or abnormal situations. When the unit load decreases or a boiler malfunction causes a reduction in steam flow, the high-pressure bypass line S2 opens, directing excess steam directly from the outlet of the high-pressure cylinder to the inlet of the reheater or the condenser to prevent turbine overspeed or overheating. Additionally, the high-pressure bypass line S2 can also be used to regulate the unit load, improving the unit's flexibility and stability. However, current high-pressure bypass lines S2 often introduce cooling spray water to lower the temperature of the high-pressure steam. A large amount of cooling spray water is vaporized within the high-pressure bypass valve, further reducing the temperature of the wet steam.

[0050] The crystallization system and method for solidifying desulfurization wastewater of this invention connects the high-pressure bypass pipeline of the boiler in a coal-fired power plant unit to the steam channel via a steam feed valve (or directly the bypass valve of the high-pressure bypass pipeline), thus coupling the high-pressure bypass pipeline to the crystallizer. The crystallizer's massive tower (typically over 8 meters in diameter and over 10 meters in height) cools the high-pressure wet steam from the high-pressure bypass pipeline, achieving energy transfer from the high-pressure wet steam. The heat energy of the high-pressure wet steam is transferred to the tower body of the crystallizer, significantly increasing the tower temperature. Simultaneously, it solves the problem in current technologies where, during crystallizer startup, high-temperature flue gas (typically above 300°C) from the crystallizer inlet "warms" the crystallizer and directly discharges from the bottom into the bag filter, causing filter bag burnout. Since the temperature tolerance of bag filter bags is typically no higher than 190°C, such high flue gas temperatures pose a significant risk to the safe use of bag filter bags. Existing technologies often address this issue by introducing cold air. This application's crystallizer eliminates the need for "tower warming" with high-temperature flue gas. Instead, it uses steam from a high-pressure bypass pipeline for tower warming, significantly reducing the risk of damage to the filter bags inside the baghouse dust collector caused by high-temperature flue gas. Therefore, this crystallizer fully realizes the energy transfer and reuse of high-pressure wet steam from the high-pressure bypass pipeline of the power plant boiler, solving the problem of damage to the filter bags inside the baghouse dust collector caused by tower warming in existing projects.

[0051] The crystallization system for solidifying desulfurization wastewater of the present invention, by coupling the high-pressure bypass pipeline S2 of the boiler in the coal-fired power plant unit, and setting up a liquid inlet unit S3, a flue gas pipeline S4 of the boiler in the coal-fired power plant unit, a compressed air inlet unit S5 and an ash discharge unit S6, can effectively achieve solidification and separation of desulfurization wastewater based on the transfer of steam energy in the high-pressure bypass pipeline.

[0052] In one embodiment, the liquid inlet unit S3 includes a desulfurization wastewater raw material tank S31 and a liquid inlet pipeline S32. The inlet end of the liquid inlet pipeline S32 is connected to the lower part of the desulfurization wastewater raw material tank S31, and the outlet end is connected to the desulfurization wastewater inlet 103. A feed pump S33 is provided on the liquid inlet pipeline S32.

[0053] Those skilled in the art will understand that a stirrer is installed inside the desulfurization wastewater raw material tank S31 and an inlet control valve is installed on the inlet pipeline S32.

[0054] In one implementation, such as Figure 1 As shown, the liquid inlet unit S3 also includes a circulation return pipeline S34, the water inlet of which is connected to the water outlet of the feed pump S33, and the water outlet is connected to the top inlet of the desulfurization wastewater raw material tank S31.

[0055] Those skilled in the art will understand that a recirculation valve is provided on the recirculation line S34.

[0056] In one implementation, such as Figure 1 As shown, the compressed air intake unit S5 includes a dry air compressor S51 and a dry compressed air storage tank S51 connected together. The dry compressed air storage tank S51 is connected to the compressed air inlet 111 via a compressed air intake pipeline S53.

[0057] Those skilled in the art will understand that an intake control valve is provided on the compressed air intake pipe S53.

[0058] In one implementation, such as Figure 1 As shown, the crystallizer S1 is also provided with a bypass discharge port near the ash discharge port 105; The ash discharge unit S6 includes a silo pump S61 and an ash silo S62 connected by pipelines; the silo pump S61 includes a side balance exhaust port and a top feed port, the side balance exhaust port is connected to the bypass discharge port via a balance air pipeline S64 to exhaust the silo pump S61, and the top feed port is connected to the ash discharge port 105 via a discharge pipeline S65 to receive ash powder from the crystallizer S1.

[0059] In this invention, the side balance exhaust port is provided via the balance air pipeline S64 mainly to exhaust air at the same time when material is fed into the silo pump S61, thereby facilitating material feeding.

[0060] To ensure timely output of ash powder separated from the crystallizer even when the silo pump S61 malfunctions, in a preferred embodiment, the ash discharge unit S6 further includes an ash discharge pipeline S63. The feed end of the ash discharge pipeline S63 is connected to the balance gas pipeline S64, and the discharge end is connected to the ash storage warehouse S62. This pipeline is used to directly send the ash powder from the crystallizer S1 to the ash storage warehouse S62 when the silo pump S61 malfunctions.

[0061] To prevent ash powder from accumulating in the ash removal unit S6 and clogging the conveying pipeline, in one embodiment, such as Figure 1 As shown, the crystallization system also includes a soot blowing unit S7, which includes a soot blowing air compressor S71 and a soot blowing compressed air storage tank S72 connected by pipelines. The soot blowing compressed air storage tank S72 is connected to the silo pump S61 through a soot blowing pipeline S73, and is used to provide soot blowing compressed air to the silo pump S61 for soot blowing, thereby ensuring that the ash discharge unit S6 is unobstructed.

[0062] In a preferred embodiment, such as Figure 1 As shown, the upper, lower and bottom parts of the silo pump S61 are respectively provided with a first ash blowing port, a second ash blowing port and a third ash blowing port. The outlet end of the ash blowing pipeline S73 has three branches, which are respectively connected to the first ash blowing port, the second ash blowing port and the third ash blowing port, so as to blow ash from the upper, middle and lower positions respectively, avoiding the accumulation of ash powder at the bottom or other positions.

[0063] In a preferred embodiment, such as Figure 1 As shown, an air replenishment ring S74 is also provided on the ash conveying pipeline from the silo pump S61 to the ash warehouse S62. An auxiliary blowing pipeline S75 is provided from the inlet end of the soot blowing pipeline S73 to the air replenishment ring S74. It is used to provide compressed air for soot blowing to the ash conveying pipeline to assist blowing, thereby providing soot blowing assistance during the long pipeline ash conveying process and ensuring the smooth flow of the ash conveying pipeline.

[0064] In one embodiment, the steam feed valve 3 is a hydraulic valve; like Figure 1As shown, the crystallization system also includes a hydraulic control unit S8. The hydraulic control unit S8 includes an oil tank S81 and an oil pump S82 connected by pipelines, as well as a first solenoid valve S83. The oil outlet of the oil pump S82 is connected to the telescopic end in the hydraulic structure of the steam feed valve 3 through a first oil supply pipeline S84. The hydraulic cylinder end in the hydraulic structure of the steam feed valve 3 is connected to the oil tank S81 through a first return oil pipeline S87. The first solenoid valve S83 is located on the first oil supply pipeline S84 and the first return oil pipeline S87 near the steam feed valve 3, and is used to control the flow of hydraulic oil in the hydraulic structure of the steam feed valve 3, thereby controlling the opening degree of the steam feed valve 3.

[0065] Those skilled in the art will understand that the flow of hydraulic oil within a hydraulic structure can control its expansion and contraction. In this invention, the hydraulic control unit S8 controls the expansion and contraction of the hydraulic structure by controlling the flow of hydraulic oil within it, thereby controlling the opening of the steam feed valve 3 and thus controlling the steam feed flow rate.

[0066] In one implementation, such as Figure 1 As shown, the hydraulic control unit S8 further includes a throttle valve S85, which is located at the inlet end of the first oil supply line S84; the hydraulic control unit S8 also includes an overflow line S86, the inlet and outlet ends of which are connected to the inlet end of the throttle valve S85 and the oil tank S81, respectively, and an overflow valve is provided on it for hydraulic oil return.

[0067] In one implementation, such as Figure 2 , 8 As shown, in the crystallizer S1, a flue gas equalization component 4 is also provided at the bottom corresponding to the flue gas equalization zone. The flue gas equalization component 4 is coaxially arranged in the inner tower body 1 and fixed to the inner wall of the inner tower body 1 by its edge. It is used to evenly distribute the flue gas entering the flue gas equalization zone and then output it to the drying spray zone.

[0068] In one implementation, such as Figure 2 , 8As shown, the flue gas uniform distribution assembly 4 includes a first uniform distribution disk 41 and a second uniform distribution disk 42 that are coaxial with the tower body and spaced apart. The first uniform distribution disk 41 and the second uniform distribution disk 42 are respectively fixed to the inner wall of the inner tower body 1 by their edges. The first uniform distribution disk 41 is provided with a first uniform distribution hole 411, and the second uniform distribution disk 42 is provided with a second uniform distribution hole 421. The first uniform distribution hole 411 and the second uniform distribution hole 421 are staggered, so that the flue gas entering the flue gas uniform distribution area is uniformly distributed and turbulent twice before being introduced into the drying spray area, ensuring its uniform distribution in the drying spray area, and making full use of its heat to dry and solidify the desulfurization wastewater droplets in the drying spray area to form ash particles.

[0069] To improve the uniformity of distribution, in one embodiment, the aperture of the first uniform distribution hole 411 is larger than the aperture of the second uniform distribution hole 421, so that the flue gas first passes through the larger aperture for uniform distribution and then through the smaller aperture for uniform distribution, thereby improving the uniformity of the flue gas when it enters the drying spray zone.

[0070] In order to improve the efficient flow of flue gas, in one embodiment, the total area of ​​the first uniform distribution holes 411 on the first uniform distribution disk 41 is S1 and the total area of ​​the second uniform distribution holes 421 on the second uniform distribution disk 42 is S2. Then S1=S2, so that the total flow of the two is the same, avoiding flue gas blockage and insufficient flue gas.

[0071] In one implementation, such as Figure 2 , 3 As shown, in the crystallizer S1, the spray gun 6 in the drying spray zone includes an elbow 61 and a spray gun assembly 62; the elbow 61 includes an inner elbow 611 and an outer elbow 612 spaced apart, forming an inner bend channel and an outer bend channel, and its inner bend channel is connected to the inner channel of the feed pipe 5 for introducing desulfurization wastewater, and its outer bend channel is connected to the outer channel of the feed pipe 5 for introducing compressed air, so as to realize the separate introduction of desulfurization wastewater and compressed air.

[0072] In one implementation, such as Figure 3 As shown, the spray gun assembly 62 includes a housing 621, and a swirl feeding assembly, a swirl atomizing assembly, and a spraying assembly arranged sequentially from top to bottom within the housing 621. The housing 621 forms a feeding section, an atomizing section, and a spraying section that are connected sequentially from top to bottom, for feeding desulfurization wastewater and compressed air in sequence, atomizing the desulfurization wastewater to form desulfurization wastewater droplets, and spraying out the desulfurization wastewater droplets.

[0073] In one implementation, such as Figure 3 As shown, the cyclone feeding assembly includes an inner shell 6211, a cyclone component 6223, a first baffle 6224, and a second baffle 6225; The inner shell 6211 and the shell 621 are separated to form a first inner flow channel and a first outer flow channel. The first inner flow channel is connected to the inner bend channel of the elbow 61, and the first outer flow channel is connected to the outer bend channel of the elbow 61, for respectively introducing desulfurization wastewater and compressed air to the atomization section. The swirl component 6223 is disposed at the bottom of the inner shell 6211 and is provided with a swirl hole. The inlet of the swirl hole is located at the top of the swirl component 6223 and is connected to the first inner flow channel. The outlet of the swirl hole is located at the bottom of the swirl component 6223 and is connected to the swirl cutting atomizing assembly. It is used to swirl the desulfurization wastewater from the inner curved channel through the first inner flow channel and the swirl hole into the swirl cutting atomizing assembly. The first baffle plate 6224 is sleeved on the upper end of the swirl component 6223, and the second baffle plate 6225 is sleeved on the lower end of the swirl component 6223. The first baffle plate 6224 and the second baffle plate 6225 are arranged in parallel and are respectively fixed to the inner wall of the housing 621 by their outer edges. The first baffle plate 6224 is provided with a first baffle hole, and the second baffle plate 6225 is provided with a second baffle hole. The first baffle hole and the second baffle hole are staggered and arranged to allow compressed air from the outer curved channel to be introduced into the swirl atomizing component in sequence through the first outer flow channel, the first baffle hole and the second baffle hole, thereby disrupting the laminar flow of the compressed air and forming a turbulent state, thereby enhancing the mixing and atomization effect with the desulfurization wastewater.

[0074] In one embodiment, the swirl component 6223 is an n-channel swirl orifice component, where n ≥ 2.

[0075] In one implementation, such as Figure 3 , 9 As shown, the swirl component 6223 is a four-channel swirl flow hole component.

[0076] In one implementation, such as Figure 3 , 9 As shown, the swirl component 6223 includes a first swirl channel, a second swirl channel, a third swirl channel, and a fourth swirl channel; The first swirl channel includes an inlet A and an outlet a; The second swirl channel includes an inlet B and an outlet b; The third swirl channel includes an inlet C and an outlet c; The fourth vortex channel includes an inlet D and an outlet d; Inlet A, inlet B, inlet C and inlet D are arranged in a ring-like pattern on the upper surface of the swirl component 6223, with intervals between them; preferably, they are arranged uniformly. Outlets a, b, c, and d are arranged in a ring-like pattern on the lower surface of the swirl component 6223, with intervals between them; preferably, they are arranged uniformly. Inlet A and outlet d are respectively provided on the upper and lower surfaces of the swirl component 6223; Inlet B and outlet a are respectively provided on the upper and lower surfaces of the swirl component 6223; Inlet C and outlet b are respectively provided on the upper and lower surfaces of the swirl component 6223; The inlet D and outlet c are respectively provided on the upper and lower surfaces of the swirl component 6223.

[0077] The crystallization system and method for desulfurization wastewater evaporation of the present invention, in the crystallizer, by setting a swirling feed component in the drying spray zone, can feed compressed air and desulfurization wastewater separately, and make the compressed air turbulent feed and the desulfurization wastewater swirling feed, so that the two can fully atomize the desulfurization wastewater when entering the atomization section.

[0078] In one implementation, such as Figure 3 As shown, the rotary cutting atomizing assembly includes an atomizing cylinder, an isolation disk 6226, and a rotary cutting structure 6227; The top of the atomizing cylinder is fixed to the bottom of the swirl component 6223 and is connected to the swirl hole. The bottom of the atomizing cylinder is provided with a bottom plate 6230 to form a swirl atomization space. The rotary cutting structure 6227 is coaxially disposed inside the atomizing cylinder, with its first end fixed to the bottom of the swirling component 6223 and its second end fixed to the top of the base plate 6230, for rotary cutting the incoming desulfurization wastewater to form a desulfurization wastewater cone-shaped plate. The isolation disc 6226 is sleeved on the outside of the atomizing cylinder and fixed to the inner wall of the housing 621 by its outer edge, dividing the atomizing cylinder into a connected upper cylinder 6228 and a lower cylinder 6229; the upper cylinder 6228 is provided with an air inlet hole on its cylinder wall for introducing compressed air from the feeding section into the atomizing cylinder to atomize the formed desulfurization wastewater conical plate into desulfurization wastewater droplets; the lower cylinder 6229 is provided with a mist outlet slit on its cylinder wall for outputting the desulfurization wastewater droplets in the atomizing cylinder.

[0079] In one implementation, such as Figure 3 As shown, the spiral cutting structure 6227 is a spiral slicing ring column, preferably an equilateral triangular spiral slicing ring column, that is, the cross-section of the spiral slicing ring column is an equilateral triangle.

[0080] In one implementation, such as Figure 3As shown, the spray assembly includes a spray cylinder 6231, which is fixed to the bottom of the base plate 6230 via its top. The housing 621 is connected to the outer wall of the spray cylinder 6231 via a first truncated conical housing 6330, dividing the spray cylinder 6231 into a connected upper spray cylinder and a lower spray cylinder. The outer wall of the upper spray cylinder, the first truncated conical housing 6330, the housing 621, and the rotary atomizing assembly form a first space to receive desulfurization wastewater droplets from the lower cylinder 6229. The cylinder wall of the upper spray cylinder is provided with a spray hole 6233 for spraying desulfurization wastewater droplets from the first space into the spray cylinder 6231 and out from its bottom nozzle.

[0081] The crystallization system and method for desulfurization wastewater evaporation of the present invention, in crystallizer S1, through the dual-channel arrangement of the swirling feed component in the spray gun assembly in the drying spray zone, desulfurization wastewater is formed into a swirling flow and enters the atomization section through its swirling component, and compressed air is formed into a turbulent flow and enters the atomization section through its first and second baffles, and is swirled and atomized by the swirl-cutting atomization component in the atomization section. The swirling desulfurization wastewater is cut into thin conical pieces, i.e., desulfurization wastewater conical pieces, by high-speed contact with the swirl-cutting atomization component. The desulfurization wastewater conical pieces collide with the compressed air flow in the atomization section and are atomized, forming desulfurization wastewater droplets that are ejected from the bottom nozzle of the spray cylinder 6231. When the desulfurization wastewater is cut and atomized by the rotary cutting and atomizing component, the desulfurization wastewater is deflected outward by the upstream surface of the spiral slice in the rotary cutting structure into a thin conical slice. At the same time, the compressed air that enters after two turbulences collides with the desulfurization wastewater conical slice at high speed and in a turbulent state, causing the desulfurization wastewater conical slice to be atomized by the compressed air to form desulfurization wastewater droplets.

[0082] In one implementation, such as Figure 3 As shown, the spray gun assembly 62 is also provided with an outer shell 6222 at the position corresponding to the atomizing section. The outer shell 6222 is fitted onto the housing 621 with a gap to form a first external spray slit. The spray gun assembly 62 is further provided with an outer spray cylinder 6232 and a third truncated conical shell 6333 connected to each other at the position corresponding to the spray section. The outer spray cylinder 6232 is gapped in the middle of the lower spray cylinder, and the third truncated conical shell 6333 is gapped in the first truncated conical shell 6330, forming a second outer spray slit. The top of the outer shell 6222 is connected to the lower outer wall of the shell 621 corresponding to the feeding section via the second truncated conical shell 6331, and the bottom is connected to the outer spray cylinder 6232 via the third truncated conical shell 6333, for connecting the first outer spray slit and the second outer spray slit; The housing 621 is provided with a protective air hole 6332 at the position corresponding to the second truncated cone housing 6331, which is used to spray the compressed air introduced through the first external flow channel out through the first external spray slit and the second external spray slit in sequence.

[0083] In one embodiment, there are at least two protective vents 6332, which are distributed around the periphery of the housing 621, preferably evenly distributed, for example, 2-30, such as 5, 10, 15, 20, 25 and 30, and any value and range within this range.

[0084] In this invention, the desulfurization wastewater droplets ejected from the bottom nozzle of the spray cylinder 6231 in the crystallizer S1 contain calcium sulfate crystals. These calcium sulfate crystals cause wear to the nozzle, and long-term operation leads to severe wear, resulting in a larger nozzle angle and thus a larger ejection area for the desulfurization wastewater droplets. This inevitably causes ash particles formed by the solidification of the desulfurization wastewater droplets to be sprayed onto the inner wall of the inner tower body 1, damaging the tower and hindering the aggregation of ash particles by the rotary crushing structure in the particle crushing zone. This invention addresses this by introducing compressed air through the first and second external spray slits, which then exit around the periphery of the bottom nozzle of the spray cylinder, forming a protective air curtain. This suppresses the spray angle, minimizing the increase in nozzle angle caused by nozzle wear, and thus minimizing the spraying of ash particles onto the inner wall of the inner tower body 1. This, in turn, minimizes damage to the tower and facilitates the aggregation of ash particles by the rotary crushing structure in the particle crushing zone.

[0085] In one implementation, such as Figure 2 , 7 As shown, the crystallizer S1 is also provided with a partition 9 corresponding to the particle crushing zone. The rotary crushing structure 10 is fixed on the top surface of the partition 9. The partition 9 is fixed to the inner wall of the inner tower body 1 by its edge and is provided with a discharge port 91 for crushing the ash particles from the drying spray zone to form ash powder for output.

[0086] In one embodiment, the diameter of the discharge port 91 gradually decreases along the material flow direction, preferably a funnel-shaped discharge port or an inverted cone-shaped discharge port.

[0087] In one embodiment, the discharge port 91 has 2 to 6 outlets, such as 2, 3, 4, 5, and 6.

[0088] In one implementation, such as Figure 2-6 As shown, the rotary crushing structure 10 includes a fixed frame 7 and a rotating component 8; The fixing frame 7 includes support columns 71, a fixing disk 72, and a fixing ring plate 73; the fixing disk 72 has a fixing hole 721 at its center for fixing the rotating component 8; there are at least three support columns 71, which are arranged in a ring around the bottom edge of the fixing disk 72 for supporting the fixing disk 72; the fixing ring plate 73 is fixed to the top edge of the fixing disk 72 by its bottom ring edge, and its top ring edge forms a feed inlet for feeding ash particles; the fixing ring plate 73 has an ash discharge hole 731 on its plate wall for outputting the ash powder obtained after crushing the ash particles; The rotating component 8 includes a drive motor 81, a drive shaft 82, a rotating disk 83, and blades 84. The drive shaft 82 passes through the fixing hole 721 onto the fixed disk 72, and its bottom end is fixed to the drive motor 81, while its top end is fixed to the bottom of the rotating disk 83, for driving the rotating disk 83 to rotate using the drive motor 81. There are at least two blades 84, which are arranged radially around the upper surface of the rotating disk 83 for rotary cutting and crushing the incoming ash particles.

[0089] The crystallization system and crystallization method for desulfurization wastewater evaporation of the present invention, wherein the crystallizer S1 is provided with a rotary crushing structure in the particle crushing zone, and the centrifugal force generated by the blades when the rotating component rotates at high speed is used to draw ash particles from the drying spray zone into the rotating disk, so that they are cut into ash powder by the high-speed rotating blades, and discharged from the ash discharge hole on the fixed ring plate, and enter the cyclone separation zone with the flue gas under the action of flue gas flow.

[0090] In one implementation, such as Figure 2 , 7 As shown, in the cyclone separation zone, the cyclone separation structure includes a cyclone separator 116 corresponding to the discharge port 91; the cyclone separator 116 includes a feed pipe 1161, a flue pipe 1162, and an ash outlet 1163; its feed pipe 1161 is located on its side wall and connected to the discharge port 91 of the particle crushing zone, for introducing ash powder along with the flue gas to perform cyclone separation of flue gas and ash powder; one end of its flue pipe 1162 is located at its top, and the other end passes through the inner tower body 1 and the outer tower body 2 in sequence and connects to the cooling flue gas outlet 104, for discharging the separated flue gas; its ash outlet 1163 is located at its bottom and connects to the ash discharge port 105, for discharging the separated ash powder.

[0091] Those skilled in the art understand that in current engineering projects, most of the solidified dry ash from crystallization systems enters the baghouse dust collector along with the flue gas. The baghouse dust collector intercepts the falling material, turning it into dry ash, which is currently used as a building material on the market. However, chloride ions and various heavy metal ions in the desulfurization wastewater subsequently enter the baghouse dust collector along with the dry ash, posing a potential danger to the future environmentally friendly use of building materials.

[0092] The crystallization system for solidifying desulfurization wastewater of the present invention separates flue gas from ash within the crystallizer S1 by incorporating a built-in cyclone separation structure in the cyclone separation zone. The discharged flue gas does not carry harmful substances such as heavy metal ions and chloride ions from the desulfurization wastewater, resulting in clean flue gas. This prevents dry ash containing large amounts of heavy metal ions and chloride ions from entering the bag filter, thus avoiding any impact on the quality of the dry ash from the bag filter in coal-fired power plants. Furthermore, it avoids the potential environmental risks associated with using dry ash collected from the bag filter to manufacture building materials, benefiting both the country and its people. The ash discharged from the bottom of the crystallizer S1 can be collected separately and processed into solid building materials such as paving bricks for sidewalks, preventing any impact on the quality of the dry ash output from the bag filter in coal-fired power plants.

[0093] In one implementation, such as Figure 2 As shown, the crystallizer is provided with an annular flue 117 along the circumference of the outer tower body 2 at the position corresponding to the cyclone separator 116, and the cooling flue gas outlet 104 is provided on the annular flue 117; the flue gas outlet pipe 1162 is located inside the annular flue 117 at the exit position of the outer tower body 2, and is used to concentrate the separated flue gas through the annular flue 117 and output it through the cooling flue gas outlet 104.

[0094] In this invention, the annular flue 117 is disposed on the outer wall of the outer tower body 2 and is arranged circumferentially along the outer wall of the outer tower body 2.

[0095] In one implementation, such as Figure 2 As shown, the cyclone separation zone is also provided with a distributor 118, which is an inverted funnel-shaped distributor. Its handle is fixed to the middle of the bottom surface of the partition 9, and its bucket extends to the bottom of the cyclone separator 116. It is used to guide and distribute the ash powder from the cyclone separator 116 to avoid accumulation.

[0096] like Figure 1-9 As shown, the operation flow of the crystallization system for solidifying desulfurization wastewater according to the present invention is as follows: The opening of the steam feed valve 3 is controlled by the hydraulic control unit S8, and the steam from the high-pressure bypass pipeline S2 of the boiler in the coal-fired power plant unit is introduced into the steam channel in the crystallizer S1 through the steam inlet 301 to warm the tower, and the cooling steam is output from the cooling steam outlet 101. The desulfurization wastewater from the liquid inlet unit S3 is introduced into the drying spray zone of the crystallizer S1 through the desulfurization wastewater inlet 103; Compressed air from the compressed air intake unit S5 is introduced into the drying spray zone of the crystallizer S1 through the compressed air inlet 111 to atomize the introduced desulfurization wastewater and form desulfurization wastewater droplets. Flue gas from the boiler in the coal-fired power plant unit is introduced into the drying spray zone of the crystallizer S1 through the flue gas inlet 102. The desulfurization wastewater droplets in the drying spray zone are evaporated and solidified to generate ash particles, and then cooled flue gas is output. The ash discharge unit S6 is connected to the ash discharge port 105 and is used to discharge the ash powder discharged from the crystallizer S1. In the crystallizer S1, Compressed air from the compressed air intake unit S5 and desulfurization wastewater from the liquid inlet unit S3 are respectively introduced into the outer and inner channels of the feed pipe 5 through the compressed air inlet 111 and the desulfurization wastewater inlet 103, and then into the outer and inner curved channels of the elbow 61 in the spray gun 6, and then into the spray gun assembly 62, and are processed by the swirl feed assembly, the swirl cutting atomization assembly and the spray assembly in sequence to spray out desulfurization wastewater droplets; Flue gas from the boiler in the coal-fired power plant unit is sequentially introduced from the flue gas inlet 102 into the flue gas distribution area and the drying spray area, so as to evaporate and solidify the desulfurization wastewater droplets sprayed from the spray gun 6 in the drying spray area and output ash particles. The ash particles in the drying spray zone are collected and crushed by the rotary crushing structure 10 in the particle crushing zone, and output as ash powder with the flue gas. The ash powder from the particle crushing zone enters the cyclone separation structure of the cyclone separation zone along with the flue gas for cyclone separation, outputting clean flue gas and ash powder; wherein... The cyclone separation zone uses a cyclone separator 116 to cyclone the ash powder fed in with the flue gas. The separated clean flue gas is transported to the annular flue 117 through its flue pipe 1162 and output through the cooled flue gas outlet 104. The separated ash powder is discharged sequentially through the ash outlet 1163, the distributor 118 and the ash discharge port 105.

[0097] The present invention also provides a crystallization method for solidifying desulfurization wastewater using the aforementioned crystallization system.

[0098] In one embodiment, the crystallization method includes: The opening degree of the steam feed valve 3 is controlled by the hydraulic control unit S8; Steam from the high-pressure bypass line S2 of the boiler in the coal-fired power plant unit is introduced into the steam channel of the crystallizer S1 to heat the tower. In the drying spray zone of the crystallizer S1, compressed air from the compressed air intake unit S5 is used to atomize the desulfurization wastewater from the liquid inlet unit S3 to form desulfurization wastewater droplets. Flue gas from the flue gas pipeline S4 of the boiler in the coal-fired power plant unit is sequentially passed into the flue gas distribution area and the drying spray area, and the desulfurization wastewater droplets are evaporated and solidified in the drying spray area to generate ash particles, and then cooled flue gas is output. In the particle crushing zone of the crystallizer S1, ash particles and cooling flue gas from the drying spray zone are received, and the ash particles from the drying spray zone are crushed by the rotary crushing structure 10 to form ash powder. In the cyclone separation zone of the crystallizer S1, ash powder and cooling flue gas from the particle crushing zone are separated by cyclone separation, and cooling flue gas is output from the cooling flue gas outlet 104 and ash powder is output from the ash discharge port 105. The ash removal unit S6 is used to remove ash powder from the crystallizer S1; The soot blowing unit S7 is used to blow soot onto the ash discharge unit S6 to prevent the accumulation of ash powder.

[0099] The crystallization system and crystallization method for solidifying desulfurization wastewater of the present invention have the following advantages: (1) By coupling the high-pressure bypass pipeline S2 of the boiler in the coal-fired power plant unit, the high-pressure steam heat from the boiler in the coal-fired power plant unit is transferred to the crystallizer S1 used for desulfurization wastewater evaporation. Compared with the existing technology of cooling by water spray, this technology not only achieves energy transfer, but also avoids the damage to the filter bags of the bag filter when the high-temperature flue gas in the crystallizer S1 is heated.

[0100] (2) The opening of the steam feed valve 3 is adjusted by hydraulic control unit S8, so that steam can be introduced on demand.

[0101] (3) By setting up a dual-channel system for the spray gun assembly in the drying spray zone, the desulfurization wastewater is formed into a swirling flow by its swirling component and enters the atomization section. The swirling desulfurization wastewater is then cut and atomized by the swirling atomization component in the atomization section. The swirling desulfurization wastewater is cut into thin conical pieces by high-speed contact with the swirling atomization component, i.e., desulfurization wastewater conical pieces. The desulfurization wastewater conical pieces collide with the compressed air flow in the atomization section and are atomized to form desulfurization wastewater droplets.

[0102] (4) By setting a rotary crushing structure in the particle crushing zone, the centrifugal force generated by the blades when the rotating parts are rotating at high speed is used to draw the ash particles from the drying spray zone into the rotating disk, so that they are cut into ash powder by the high-speed rotating blades and discharged from the ash discharge hole on the fixed ring plate, and enter the swirl separation zone with the flue gas under the action of flue gas flow.

[0103] (5) By incorporating a cyclone separation structure within the cyclone separation zone, flue gas and ash are separated. The discharged flue gas does not carry harmful substances such as heavy metals and chloride ions from the desulfurization wastewater, resulting in clean flue gas. This avoids the entry of dry ash containing large amounts of heavy metal ions and chloride ions into the bag filter, thus not affecting the quality of the dry ash from the bag filter of the coal-fired power plant. Consequently, it avoids the potential environmental risks arising when the dry ash collected from the bag filter is used to manufacture building materials, benefiting both the country and the people. The ash discharged from the bottom of this device (desulfurization wastewater solidified into dry ash) can be collected separately and processed into solid building materials such as paving bricks for sidewalks.

[0104] (6) The ash discharge unit S6 and the soot blowing unit S7 help to smoothly discharge the ash powder obtained by solidification of desulfurization wastewater from the crystallizer S1.

[0105] (7) The setting of the hydraulic control unit S8 helps to adjust the flow rate of feed steam and feed flue gas.

[0106] Although the present invention has been described in detail through the preferred embodiments described above, it should be understood that the above description should not be considered as limiting the invention. Those skilled in the art will understand that modifications and adjustments can be made to the invention based on the teachings of this specification. These modifications and adjustments should also be within the scope defined by the claims of the present invention.

Claims

1. A crystallization system for solidification of desulfurization wastewater, characterized by, The crystallization system comprises a crystallizer (S1), a high-pressure bypass pipeline (S2) of a boiler in a coal-fired power plant unit, a liquid inlet unit (S3), a flue gas pipeline (S4) of the boiler in the coal-fired power plant unit, a compressed air inlet unit (S5) and an ash discharge unit (S6) in communication; wherein, The crystallizer (S1) comprises a steam feeding valve (3) and a tower body; the tower body comprises an inner tower body (1) and an outer tower body (2), and a steam passage is formed between the inner tower body (1) and the outer tower body (2); The steam feeding valve (3) is arranged at the top of the tower body, and a steam inlet (301) of the steam feeding valve (3) is connected to the high-pressure bypass pipeline (S2) of the boiler in the coal-fired power plant unit, and a steam outlet of the steam feeding valve (3) is communicated to the steam passage, for controlling the steam from the high-pressure bypass pipeline (S2) to be introduced into the steam passage to provide heat and then form cooling steam when the tower is warmed up; a cooling steam outlet (101) is arranged at the lower part of the outer tower body (2) for outputting the cooling steam from the steam passage; The inner tower body (1) comprises, from top to bottom, a flue gas uniform distribution area, a drying and spraying area, a particle crushing area and a cyclone separation area in communication; wherein, The crystallizer (S1) is provided with a feeding pipe (5) and a spray gun (6) corresponding to the drying and spraying area; the feeding pipe (5) is provided with an inner passage and an outer passage, the inner passage is provided with a desulfurization wastewater inlet (103), and the outer passage is provided with a compressed air inlet (111) communicated to the compressed air inlet unit (S5) through the compressed air inlet (111) and to the liquid inlet unit (S3) through the desulfurization wastewater inlet (103), for introducing the desulfurization wastewater and the compressed air into the drying and spraying area, respectively; the spray gun (6) is connected to the feeding pipe (5) for introducing the compressed air and the desulfurization wastewater from the feeding pipe (5) to atomize the desulfurization wastewater to form desulfurization wastewater mist droplets for spraying; The crystallizer (S1) is provided with a flue gas inlet (102) corresponding to the upper part of the flue gas uniform distribution area, and the flue gas inlet (102) is connected to the flue gas pipeline (S4) of the boiler in the coal-fired power plant unit, for sequentially introducing the flue gas from the flue gas pipeline (S4) into the flue gas uniform distribution area and the drying and spraying area, so that the flue gas is used to evaporate and solidify the desulfurization wastewater mist droplets in the drying and spraying area to generate ash particles, and cooling flue gas is outputted; The crystallizer (S1) is provided with a rotating crushing structure (10) corresponding to the particle crushing area, for crushing the ash particles from the drying and spraying area to form ash powder; The crystallizer (S1) is provided with a cooling flue gas outlet (104) at the upper part of the cyclone separation zone and an ash outlet (105) at the bottom, and is connected to the ash removal unit (S6) through the ash outlet (105); the cyclone separation zone is provided with a cyclone separation structure, and the inlet thereof is connected to the discharge outlet of the particle crushing zone, for cyclone separation of the ash powder and the cooling flue gas from the particle crushing zone, and output of the cooling flue gas from the cooling flue gas outlet (104) and the ash powder from the ash outlet (105) to the ash removal unit (S6).

2. The crystallization system according to claim 1, characterized in that, the liquid inlet unit (S3) comprises a desulfurization wastewater raw material tank (S31) and a liquid inlet pipeline (S32), the water inlet end of the liquid inlet pipeline (S32) is connected to the lower part of the desulfurization wastewater raw material tank (S31), the water outlet end is connected to the desulfurization wastewater inlet (103), and a feed pump (S33) is arranged on the liquid inlet pipeline (S32); and / or, the compressed air inlet unit (S5) comprises a drying air compressor (S51) and a drying compressed air storage tank (S52) connected in communication, and the drying compressed air storage tank (S52) is connected to the compressed air inlet (111) through a compressed air inlet pipeline (S53).

3. The crystallization system according to claim 1 or 2, characterized in that, the crystallizer (S1) is further provided with a bypass discharge outlet adjacent to the ash outlet (105); the ash removal unit (S6) comprises a bin pump (S61) and a slag bin (S62) connected in communication through pipelines; the bin pump (S61) comprises a side balance exhaust port and a top feed port, the side balance exhaust port is connected to the bypass discharge outlet through a balance gas pipeline (S64) to exhaust the bin pump (S61), and the top feed port is connected to the ash outlet (105) through a discharge pipeline (S65) to receive the ash powder from the crystallizer (S1); Preferably, the ash removal unit (S6) further comprises an ash falling pipeline (S63), the feed end of the ash falling pipeline (S63) is connected to the balance gas pipeline (S64), and the discharge end is connected to the slag bin (S62), for directly sending the ash powder from the crystallizer (S1) to the slag bin (S62) when the bin pump (S61) fails. Preferably, the crystallization system further comprises a soot blowing unit (S7), the soot blowing unit (S7) comprising a soot blowing air compressor (S71) and a soot blowing compressed air tank (S72) connected in communication through pipelines, the soot blowing compressed air tank (S72) being connected to the bin pump (S61) through a soot blowing pipeline (S73) for providing soot blowing compressed air to the bin pump (S61) for soot blowing; preferably, the upper part, lower part and bottom part of the bin pump (S61) are respectively provided with a first soot blowing port, a second soot blowing port and a third soot blowing port, the outlet end of the soot blowing pipeline (S73) is branched into three branches and is respectively connected to the first soot blowing port, the second soot blowing port and the third soot blowing port; preferably, the air supplementing ring (S74) is further provided on the ash conveying pipeline from the bin pump (S61) to the ash bin (S62), and a soot blowing assisting pipeline (S75) is provided from the inlet end of the soot blowing pipeline (S73) to the air supplementing ring (S74) for providing soot blowing compressed air to the ash conveying pipeline for soot blowing assisting.

4. The crystallization system according to any one of claims 1-3, characterized in that, the steam feeding valve (3) is a hydraulic valve; the crystallization system further comprises a hydraulic control unit (S8), the hydraulic control unit (S8) comprising an oil tank (S81) and an oil pump (S82) connected through pipelines, and a first electromagnetic valve (S83), the oil outlet end of the oil pump (S82) being connected to the telescopic end in the hydraulic structure of the steam feeding valve (3) through a first oil conveying pipeline (S84), the hydraulic cylinder end in the hydraulic structure of the steam feeding valve (3) being connected to the oil tank (S81) through a first oil return pipeline (S87), the first electromagnetic valve (S83) being arranged on the first oil conveying pipeline (S84) and the first oil return pipeline (S87) near the steam feeding valve (3) for controlling the flow of hydraulic oil in the hydraulic structure of the steam feeding valve (3) to control the opening degree of the steam feeding valve (3); Preferably, the hydraulic control unit (S8) further comprises a throttle valve (S85) arranged at the inlet end of the first oil conveying pipeline (S84); the hydraulic control unit (S8) further comprises an overflow pipeline (S86), the inlet and outlet ends of the overflow pipeline (S86) being respectively connected to the inlet end of the throttle valve (S85) and the oil tank (S81), and an overflow valve being arranged thereon for hydraulic oil backflow.

5. The crystallization system of claim 4, wherein, In the crystallizer (S1), a flue gas uniform distribution assembly (4) is further arranged at the bottom corresponding to the flue gas uniform distribution area, the flue gas uniform distribution assembly (4) being coaxially arranged in the inner tower body (1) and being fixed to the inner wall of the inner tower body (1) through its edge for uniformly distributing the flue gas entering the flue gas uniform distribution area and outputting the flue gas to the drying and spraying area; Preferably, the flue gas uniform distribution assembly (4) comprises a first uniform distribution disc (41) and a second uniform distribution disc (42) which are coaxial with the tower body and are arranged at intervals, the first uniform distribution disc (41) and the second uniform distribution disc (42) are respectively fixed on the inner wall of the inner tower body (1) through edges; the first uniform distribution disc (41) is arranged with first uniform distribution holes (411), and the second uniform distribution disc (42) is arranged with second uniform distribution holes (421), the first uniform distribution holes (411) and the second uniform distribution holes (421) are arranged in a staggered manner.

6. The crystallization system of claim 5, wherein, In the crystallizer (S1), The spray gun (6) of the drying spray zone comprises an elbow (61) and a spray gun assembly (62); the elbow (61) comprises an inner elbow (611) and an outer elbow (612) arranged at intervals, forming an inner elbow channel and an outer elbow channel, and is connected to the inner channel of the feed pipe (5) through the inner elbow channel for passing in desulfurization wastewater, and is connected to the outer channel of the feed pipe (5) through the outer elbow channel for passing in compressed air; Preferably, the spray gun assembly (62) comprises a shell (621), and a cyclone feed assembly, a rotary cutting atomization assembly and a spray assembly are sequentially arranged in the shell (621) from top to bottom, forming a feed section, an atomization section and a spray section which are sequentially connected in the shell (621) for sequentially feeding desulfurization wastewater and compressed air, atomizing the desulfurization wastewater to form desulfurization wastewater droplets, and spraying the desulfurization wastewater droplets out; Preferably, the cyclone feed assembly comprises an inner shell (6211), a cyclone part (6223), a first baffle plate (6224) and a second baffle plate (6225); The inner shell (6211) is arranged at an interval with the shell (621) to form a first inner flow channel and a first outer flow channel, and is connected to the inner elbow channel of the elbow (61) through the first inner flow channel and is connected to the outer elbow channel of the elbow (61) through the first outer flow channel for passing in desulfurization wastewater and compressed air respectively into the atomization section; The cyclone part (6223) is arranged at the bottom of the inner shell (6211) and is provided with a cyclone hole, the inlet of the cyclone hole is located at the top end of the cyclone part (6223) and is connected to the first inner flow channel, and the outlet of the cyclone hole is located at the bottom end of the cyclone part (6223) and is connected to the rotary cutting atomization assembly, for sequentially passing in the desulfurization wastewater from the inner elbow channel into the rotary cutting atomization assembly through the first inner flow channel and the cyclone hole; The first spoiler (6224) is sleeved on the upper end of the cyclone component (6223), and the second spoiler (6225) is sleeved on the lower end of the cyclone component (6223); the first spoiler (6224) and the second spoiler (6225) are arranged in parallel and are respectively fixed on the inner wall of the shell (621) through the outer edges; the first spoiler (6224) is provided with a first spoiler hole, and the second spoiler (6225) is provided with a second spoiler hole, and the first spoiler hole and the second spoiler hole are arranged in a staggered manner, for sequentially passing the compressed air from the outer bending channel into the rotary cutting atomization assembly through the first outer flow channel, the first spoiler hole and the second spoiler hole; And / or, The rotary cutting atomization assembly comprises an atomization cylinder, a separation disc (6226) and a rotary cutting structure (6227); The top of the atomization cylinder is fixed to the bottom of the cyclone component (6223) and communicates with the cyclone hole, and the bottom of the atomization cylinder is provided with a bottom plate (6230) for forming a rotary cutting atomization space; The rotary cutting structure (6227) is coaxially arranged in the atomization cylinder, and a first end thereof is fixed to the bottom of the cyclone component (6223) and a second end thereof is fixed to the top of the bottom plate (6230), for performing rotary cutting on the entering desulfurization wastewater to form desulfurization wastewater conical pieces; The separation disc (6226) is sleeved on the outside of the atomization cylinder and is fixed to the inner wall of the shell (621) through the outer edge, so as to separate the atomization cylinder into an upper cylinder body (6228) and a lower cylinder body (6229) in communication; the cylinder wall of the upper cylinder body (6228) is provided with an air inlet hole for passing the compressed air from the feeding section into the atomization cylinder to atomize the formed desulfurization wastewater conical pieces into desulfurization wastewater droplets; the cylinder wall of the lower cylinder body (6229) is provided with an outlet slot for outputting the desulfurization wastewater droplets in the atomization cylinder; And / or, The spray assembly comprises a spray cylinder (6231), and the spray cylinder (6231) is fixed to the bottom of the bottom plate (6230) through the top thereof; the shell (621) is connected to the outer wall of the spray cylinder (6231) through a first truncated cone-shaped shell (6330), so as to separate the spray cylinder (6231) into an upper spray cylinder and a lower spray cylinder in communication; the outer wall of the upper spray cylinder, the first truncated cone-shaped shell (6330), the shell (621) and the rotary cutting atomization assembly form a first space for receiving the desulfurization wastewater droplets from the lower cylinder body (6229); the cylinder wall of the upper spray cylinder is provided with a spray hole (6233) for spraying the desulfurization wastewater droplets from the first space into the spray cylinder (6231) and spraying them out from the bottom nozzle of the spray cylinder (6231).

7. The crystallization system of claim 6, wherein, In the crystallizer (S1), The lance assembly (62) is further provided with an outer shell (6222) at a position corresponding to the atomization section, the outer shell (6222) is gap-sleeved on the shell (621) to form a first outer spray slot; The spray gun assembly (62) is also provided with an outer spray barrel (6232) and a third truncated cone shell (6333) connected at the position corresponding to the spray section, the outer spray barrel (6232) is gap-suitingly arranged on the middle part of the lower spray barrel, and the third truncated cone shell (6333) is gap-suitingly arranged on the first truncated cone shell (6330), forming a second outer spray gap; The top of the outer shell (6222) is connected to the shell (621) on the lower part of the outer wall corresponding to the feeding section through the second truncated cone shell (6331), and the bottom is connected to the outer spray barrel (6232) through the third truncated cone shell (6333), for communicating the first outer spray gap and the second outer spray gap; The shell (621) is provided with a protection air hole (6332) at the position corresponding to the second truncated cone shell (6331), for sequentially spraying the compressed air entering through the first outer flow channel out of the first outer spray gap and the second outer spray gap.

8. The crystallization system of any one of claims 1-7, wherein, In the crystallizer (S1), A partition plate (9) is further arranged at the position corresponding to the particle crushing area, and the rotary crushing structure (10) is fixed to the top surface of the partition plate (9); the partition plate (9) is fixed to the inner wall of the inner tower body (1) through its edge, and an outlet (91) is arranged on the partition plate (9) for outputting the ash powder obtained by crushing the ash particles from the dry spray area; Preferably, the rotary crushing structure (10) comprises a fixing frame (7) and a rotating part (8); The fixing frame (7) comprises a support column (71), a fixing disc (72) and a fixing ring plate (73); the center of the fixing disc (72) is provided with a fixing hole (721) for fixing the rotating part (8); the support column (71) is at least three, and is annularly and dispersedly arranged at the bottom edge of the fixing disc (72) for supporting the fixing disc (72); the fixing ring plate (73) is fixed to the top edge of the fixing disc (72) through its bottom ring edge, and the top ring edge forms a feeding port for feeding ash particles; the plate wall of the fixing ring plate (73) is provided with an ash discharge hole (731) for outputting the ash powder obtained by crushing the ash particles; The rotating part (8) comprises a driving motor (81), a driving shaft (82), a rotating disc (83) and a blade (84); the driving shaft (82) is arranged through the fixing hole (721) in the fixing disc (72), and the bottom end thereof is fixed to the driving motor (81), and the top end thereof is fixed to the bottom of the rotating disc (83) for driving the rotating disc (83) to rotate by the driving motor (81); the blade (84) is at least two, and is annularly and dispersedly arranged on the upper surface of the rotating disc (83) along the radial direction of the rotating disc (83) for rotary cutting and crushing the entering ash particles.

9. The crystallization system of claim 8, wherein, In the crystallizer (S1), The cyclone separation zone, the cyclone separation structure comprises a cyclone separator (116) arranged corresponding to the discharge port (91); the cyclone separator (116) comprises a feed pipe (1161), a smoke outlet pipe (1162) and an ash outlet (1163); the feed pipe (1161) is arranged on the side wall of the cyclone separator (116) and connected to the discharge port (91) of the particle crushing zone, for passing the ash powder with the flue gas to separate the flue gas and the ash powder; one end of the smoke outlet pipe (1162) is arranged on the top of the cyclone separator (116), and the other end sequentially penetrates the inner tower body (1) and the outer tower body (2) and is communicated to the cooling flue gas outlet (104), for discharging the separated flue gas; The ash outlet (1163) is arranged on the bottom of the cyclone separator (116) and is communicated to the ash discharge port (105), for discharging the separated ash powder; Preferably, the crystallizer (S1) is provided with an annular flue (117) along the circumference of the outer tower body (2) at a position corresponding to the cyclone separator (116), and the cooling flue gas outlet (104) is arranged on the annular flue (117); the smoke outlet pipe (1162) is located in the annular flue (117) at the penetration position of the outer tower body (2), for collecting the separated flue gas through the annular flue (117) and then outputting the flue gas through the cooling flue gas outlet (104); and / or, The cyclone separation zone is also provided with a distributor (118), which is an inverted funnel type distributor, and the handle is fixed to the middle part of the bottom surface of the partition plate (9), and the bucket extends below the cyclone separator (116), for guiding and distributing the ash powder from the cyclone separator (116).

10. A crystallization method for solidifying desulfurization wastewater by using the crystallization system according to any one of claims 1-9.

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