阅读说明：本技术 一种用于镀镍磷废液处理的负压多效蒸发装置 (Negative pressure multiple-effect evaporation device for treating nickel and phosphorus plating waste liquid ) 是由 王叶清 王强 戴宜山 李荣林 宋峰 张伟 过瑶瑶 周春华 李昭 朱登亮 季成华 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种用于镀镍磷废液处理的负压多效蒸发装置,属于蒸发浓缩技术领域,镀镍磷废液通过换热腔预热后在进入第一蒸发腔内的布气管,通过布气管均匀的进入第一蒸发腔内部,通过一螺旋式蒸发器加热至镀镍磷废液沸腾产生蒸汽,再通过第一除雾组件去除上浮的颗粒物质,从而过滤蒸汽使其通过集气管进入换热腔内部进行对不断进入的镀镍磷废液预热,通过第一真空泵将进行第一次浓缩后的镀镍磷废液抽入至第二蒸发腔内部的布气管内部,再通过该布气管进入至第二蒸发腔内部,并通过第二螺旋式蒸发器加热至镀镍磷废液沸腾产生蒸汽。(The invention discloses a negative pressure multiple-effect evaporation device for treating nickel-phosphorus-plated waste liquid, which belongs to the technical field of evaporation concentration.)

1. A negative pressure multiple-effect evaporation plant for treating nickel and phosphorus plating waste liquid is characterized in that: comprises a shell (29) and a third evaporation cavity (8), a second evaporation cavity (10) and a first evaporation cavity (11) which are sequentially arranged inside the shell (29) from bottom to top, wherein exhaust openings (28) are formed in the side tops of the third evaporation cavity (8), the second evaporation cavity (10) and the first evaporation cavity (11), the exhaust openings (28) are connected with a heat exchange cavity (14) through a gas collecting pipe (19), supporting net racks are arranged below the inside of the third evaporation cavity (8), the second evaporation cavity (10) and the first evaporation cavity (11), a gas distribution pipe (31) with one end communicated with the outer wall of the shell (29) is arranged below the supporting net racks inside the third evaporation cavity (8), the second evaporation cavity (10) and the first evaporation cavity (11), a third spiral evaporator (7) is arranged above the supporting net racks inside the third evaporation cavity (8), just third spiral evaporimeter (7) top is equipped with third defogging subassembly (9), the inside support rack top in second evaporation chamber (10) is equipped with second spiral evaporimeter (23), just second spiral evaporimeter (23) top is equipped with second defogging subassembly (12), the inside support rack top in first evaporation chamber (11) is equipped with first spiral evaporimeter (24), just first spiral evaporimeter (24) top is equipped with first defogging subassembly (13), first evaporation chamber (11) side bottom is equipped with first vacuum pump (1), just first vacuum pump (1) through first nickel-plated phosphorus waste liquid discharge pipe (4) with the gas distribution pipe (31) intercommunication of bottom in second evaporation chamber (10), second evaporation chamber (10) side bottom is equipped with second vacuum pump (5), just second vacuum pump (5) through second nickel-plated phosphorus waste liquid discharge pipe (6) with the interior nickel-plated phosphorus waste liquid discharge pipe (6) of bottom in third evaporation chamber (8) Air distribution pipe (31) intercommunication, first heater (22), second heater (21), third heater (20) are installed respectively to the side top in first evaporation chamber (11), second evaporation chamber (10), third evaporation chamber (8), the inboard termination of first spiral evaporimeter (24), second spiral evaporimeter (23) and third spiral evaporimeter (7) is installed and is run through to outside evaporation fluid-discharge tube (25) of casing (29), evaporation fluid-discharge tube (25) are located the outside one end intercommunication of casing (29) has flowing back standpipe (2).

2. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 1 is characterized in that: the utility model discloses a stirring device, including first evaporation chamber (11) outer bottom intermediate position department with the intermediate position department of second evaporation chamber (10) outer bottom all installs spiral leaf (26), the bull stick that runs through this evaporation chamber bottom is installed at spiral leaf (26) top, and stirring leaf (27) are installed to the one end that the bull stick is located this evaporation intracavity portion, just stirring leaf (27) adopt high temperature resistant flexible rod, spiral leaf (26) adopt the stainless steel blade.

3. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 1 is characterized in that: the interior top in heat transfer chamber (14) is equipped with steam gathering chamber (15), the interior bottom in heat transfer chamber (14) is equipped with steam liquefaction chamber (16), steam gathering chamber (15) with the intercommunication has helical structure's high temperature steam heat exchange tube (17) between steam liquefaction chamber (16), the outside spiral cooperation of high temperature steam heat exchange tube (17) has low temperature nickel-plated phosphorus waste liquid heat exchange tube (18), and the one end of this low temperature nickel-plated phosphorus waste liquid heat exchange tube (18) runs through the bottom of heat transfer chamber (14), the other end of low temperature nickel-plated phosphorus waste liquid heat exchange tube (18) runs through the top in heat transfer chamber (14) and with inside gas distribution pipe (31) intercommunication in first evaporation chamber (11).

4. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 1 is characterized in that: the air distribution pipe (31) comprises a main air distribution pipe (30) from one end to the other end along the inner diameter of the shell (29), auxiliary air distribution pipes (32) are communicated with the two sides of the main air distribution pipe (30) at equal intervals along the axial direction of the main air distribution pipe, and through holes are formed in the auxiliary air distribution pipes (32) and the main air distribution pipe (30).

5. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 1 is characterized in that: first defogging subassembly (13), second defogging subassembly (12) and third defogging subassembly (9) are all including installing second defogging board (38) at roof in its evaporation chamber one side and installing third defogging board (39) at roof in its evaporation chamber opposite side, second defogging board (38) with third defogging board (39) both ends welding has the dead lever, and the outside of this dead lever is equipped with first defogging board (37) along its axial equidistant, first defogging board (37) are perpendicular shape W structure, and its turn portion all is equipped with connecting chamber (3), connecting chamber (3) interior top and interior bottom all install spacing spring (40), spacing spring (40) are kept away from connect the one end of chamber (3) inner wall and install cowl (36), and this cowl (36) articulate the inboard of connecting chamber (3).

6. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 5 is characterized in that: arc baffle (36) are located it is crooked downwards to connect chamber (3) outside department, this arc baffle (36) with be connected with the rubber layer between chamber (3), third defogging board (39) are semi-circular structure, and this semi-circular structure intermediate part also is equipped with connect chamber (3) and arc baffle (36) and spacing spring (40), second defogging board (38) middle part is vertical structure, and the top and the bottom at this middle part also are equipped with connect chamber (3) and arc baffle (36) and spacing spring (40).

7. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 1 is characterized in that: the third spiral evaporator (7), the second spiral evaporator (23) and the first spiral evaporator (24) are all multiple groups of vertical pipes and are sequentially arranged through semicircular pipe body communication from top to bottom to form a spiral structure, the outer sides of the third spiral evaporator (7), the second spiral evaporator (23) and the first spiral evaporator (24) of the spiral structure are welded with heat-conducting aluminum alloy rods (35) of parallel vertical pipes, and the outer end parts of the third spiral evaporator (7), the second spiral evaporator (23) and the first spiral evaporator (24) are communicated with the outer wall of the shell (29).

8. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 3 is characterized in that: the four corners department of casing (29) bottom and the four corners department of heat transfer chamber (14) bottom all welds the supporting leg, the intermediate position department intercommunication of casing (29) bottom has concentrated nickel-plated phosphorus waste liquid discharge pipe (33), and this concentrated nickel-plated phosphorus waste liquid discharge pipe (33) are located the inside one end of casing (29) with the inside intercommunication in third evaporation chamber (8), the bottom intercommunication in steam liquefaction chamber (16) has liquefied steam discharge pipe (34).

9. The negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating of claim 5 is characterized in that: the fixed rod, the first demisting plate (37), the third demisting plate (39), the second demisting plate (38), the limiting spring (40), the connecting cavity (3) and the arc-shaped baffle (36) are all made of high-temperature-resistant stainless steel.

Technical Field

The invention relates to an evaporation device, in particular to a negative pressure multi-effect evaporation device for treating nickel and phosphorus plating waste liquid, and belongs to the technical field of evaporation and concentration.

Background

The chemical nickel-phosphorus plating is suitable for plating nickel-phosphorus alloy layers on the surfaces of iron parts, steel parts, zinc alloys, aluminum alloys and copper alloys after zinc dipping treatment, is nontoxic, free of heavy metals, environment-friendly, free of electroplating equipment, only needing a constant temperature device, and good in corrosion resistance, excellent in binding force, strong in plating solution stability, and long in service life exceeding 12 periods, and is widely applied to chemical nickel-phosphorus plating on the surfaces of various metals and non-metals.

The chemical nickel-phosphorus plating base alloy plating layer can obtain uniform, compact and bright nickel-phosphorus alloy plating layer with metal luster, is widely applied to the industry due to high hardness, uniform thickness and excellent wear resistance, is suitable for plating nickel on metal surfaces (such as iron, stainless steel, aluminum, copper and the like), is also suitable for plating nickel on nonmetal surfaces, does not need expensive palladium deposition, and has low cost, such as ceramic nickel plating, glass nickel plating, diamond nickel plating, carbon sheet nickel plating, plastic nickel plating, resin nickel plating and the like; the bath solution is simple to maintain. Low cost and no need of electroplating equipment.

In the prior art, the chemical nickel-phosphorus plating bath solution needs to be scrapped and replaced with new bath solution after a certain service period, the concentration of heavy metal nickel in the scrapped bath solution reaches 3000-plus 5000mg/L, and the concentration of phosphorus reaches 30000-plus 50000mg/L, which far exceeds the national discharge standard, the traditional method cannot treat the waste solution to ensure that the waste solution is qualified to discharge, and then the refrigerator of the device for concentrating and discharging in the prior art usually consumes more energy, so that the negative pressure multi-effect evaporation device for treating the nickel-phosphorus plating waste solution is designed to optimize the problems.

Disclosure of Invention

The invention mainly aims to provide a negative-pressure multi-effect evaporation device for treating nickel-phosphorus-plated waste liquid, wherein the nickel-phosphorus-plated waste liquid enters a gas distribution pipe in a first evaporation cavity after being preheated by a heat exchange cavity, uniformly enters the first evaporation cavity through the gas distribution pipe, is heated by a spiral evaporator until the nickel-phosphorus-plated waste liquid boils to generate steam, then floating particulate matters are removed by a first demisting assembly, so that the steam is filtered to enter the heat exchange cavity through a gas collecting pipe to preheat the nickel-phosphorus-plated waste liquid which continuously enters, the nickel-phosphorus-plated waste liquid which is subjected to first concentration is pumped into the gas distribution pipe in a second evaporation cavity through a first vacuum pump, then enters the second evaporation cavity through the gas distribution pipe, is heated by a second spiral evaporator until the nickel-phosphorus-plated waste liquid boils to generate steam, and then the floating particulate matters are removed by the second demisting assembly, thereby filtering the steam to enable the steam to enter the heat exchange cavity through the gas collecting pipe to preheat the nickel and phosphorus plating waste liquid which continuously enters, pumping the nickel and phosphorus plating waste liquid which is concentrated for the second time into the gas distribution pipe inside the third evaporation cavity through the second vacuum pump, heating the nickel and phosphorus plating waste liquid through the third spiral evaporator until the nickel and phosphorus plating waste liquid boils to generate steam, removing floating particulate matters through the third demisting assembly, thereby filtering the steam to enter the heat exchange cavity through the gas collecting pipe to preheat the nickel and phosphorus plating waste liquid which continuously enters, collecting the finally generated high-concentration nickel and phosphorus plating waste liquid, discharging liquefied steam through the heat exchange cavity, thereby realizing that the steam evaporated from each effect is cooled by the heat exchange cavity and then becomes cooling water through three-stage concentration, can discharge up to standard, what discharge in the third evaporation chamber is that the water content is about 50% glues thick concentrate, and the damage of the energy has been reduced to the heat transfer through the heat transfer chamber in the second cooling steam.

The purpose of the invention can be achieved by adopting the following technical scheme:

a negative pressure multiple-effect evaporation device for treating nickel and phosphorus plating waste liquid comprises a shell, a third evaporation cavity, a second evaporation cavity and a first evaporation cavity which are sequentially arranged inside the shell from bottom to top, wherein exhaust openings are formed in the side tops of the third evaporation cavity, the second evaporation cavity and the first evaporation cavity and are connected with a heat exchange cavity through gas collecting pipes, supporting net frames are arranged below the inside of the third evaporation cavity, the second evaporation cavity and the first evaporation cavity, a gas distribution pipe with one end communicated with the outer wall of the shell is arranged below the supporting net frames inside the third evaporation cavity, the second evaporation cavity and the first evaporation cavity, a third spiral evaporator is arranged above the supporting net frames inside the third evaporation cavity, a third demisting assembly is arranged above the third spiral evaporator, a second spiral evaporator is arranged above the supporting net frames inside the second evaporation cavity, a second demisting assembly is arranged above the second spiral evaporator, a first spiral evaporator is arranged above a support net rack in the first evaporation cavity, a first demisting assembly is arranged above the first spiral evaporator, a first vacuum pump is arranged at the bottom of the side of the first evaporation cavity and is communicated with a gas distribution pipe at the bottom in the second evaporation cavity through a first nickel-plated phosphorus waste liquid discharge pipe, a second vacuum pump is arranged at the bottom of the side of the second evaporation cavity and is communicated with a gas distribution pipe at the bottom in the third evaporation cavity through a second nickel-plated phosphorus waste liquid discharge pipe, a first heater, a second heater and a third heater are respectively arranged at the top of the side of the first evaporation cavity, the second evaporation cavity and the third evaporation cavity, and an evaporation liquid discharge pipe penetrating to the outside of the shell is arranged at the end joint of the inner sides of the first spiral evaporator, the second spiral evaporator and the third spiral evaporator, and one end of the evaporation liquid discharge pipe, which is positioned outside the shell, is communicated with a liquid discharge vertical pipe.

Preferably, the middle position department of the outer bottom in first evaporation chamber with the middle position department of the outer bottom in second evaporation chamber all installs the spiral leaf, the bull stick that runs through this evaporation chamber bottom is installed at spiral leaf top, and the bull stick is located the inside one end in this evaporation chamber and installs the stirring leaf, just the stirring leaf adopts high temperature resistant flexible rod, the spiral leaf adopts the stainless steel blade.

Preferably, the interior top in heat transfer chamber is equipped with steam gathering chamber, the interior bottom in heat transfer chamber is equipped with the steam liquefaction chamber, steam gathering chamber with the intercommunication has helical structure's high-temperature steam heat exchange tube between the steam liquefaction chamber, the outside screw fit of high-temperature steam heat exchange tube has low temperature nickel-plated phosphorus waste liquid heat exchange tube, and the one end of this low temperature nickel-plated phosphorus waste liquid heat exchange tube runs through the bottom in heat transfer chamber, the other end of low temperature nickel-plated phosphorus waste liquid heat exchange tube run through the top in heat transfer chamber and with the inside gas distribution pipe intercommunication in first evaporation chamber.

Preferably, the air distribution pipe comprises a main air distribution pipe from one end to the other end along the inner diameter of the shell, auxiliary air distribution pipes are communicated with two sides of the main air distribution pipe along the axial direction of the main air distribution pipe at equal intervals, and through holes are formed in the auxiliary air distribution pipes and the main air distribution pipe.

Preferably, first defogging subassembly, second defogging subassembly and third defogging subassembly are all including installing the second defogging board of roof in its evaporation chamber one side and installing the third defogging board at roof in its evaporation chamber opposite side, the second defogging board with the welding of third defogging board both ends has the dead lever, and the outside of this dead lever is equipped with first defogging board along its axial equidistant, first defogging board is vertical W structure, and its turn portion all is equipped with the connection chamber, connect intracavity top and interior bottom and all install spacing spring, spacing spring keeps away from cowl is installed to the one end of connecting the intracavity wall, and this cowl articulates the inboard in connection chamber.

Preferably, the arc baffle is located the connection chamber outside department is crooked downwards, this arc baffle with be connected with the rubber layer between the connection chamber, the third defogging board is semi-circular structure, and this semi-circular structure intermediate part also is equipped with connect the chamber and arc baffle and spacing spring, second defogging board middle part is vertical structure, and the top and the bottom at this middle part also are equipped with connect the chamber and arc baffle and spacing spring.

Preferably, the third spiral evaporator, the second spiral evaporator and the first spiral evaporator are all multiple groups of vertical pipes and are sequentially arranged through semicircular pipe body communication from top to bottom to form a spiral structure, the outer sides of the third spiral evaporator, the second spiral evaporator and the first spiral evaporator of the spiral structure are connected with heat-conducting aluminum alloy rods welded with the parallel vertical pipes, and the outer end parts of the third spiral evaporator, the second spiral evaporator and the first spiral evaporator are communicated with the outer wall of the shell.

Preferably, the four corners of the bottom of the shell and the four corners of the bottom of the heat exchange cavity are all welded with supporting legs, a concentrated nickel-phosphorus plating waste liquid discharge pipe is communicated with the middle position of the bottom of the shell, one end of the concentrated nickel-phosphorus plating waste liquid discharge pipe, which is positioned inside the shell, is communicated with the inside of the third evaporation cavity, and a liquefied steam discharge pipe is communicated with the bottom of the steam liquefaction cavity.

Preferably, the fixed rod, the first demisting plate, the third demisting plate, the second demisting plate, the limiting spring, the connecting cavity and the arc-shaped baffle are all made of high-temperature-resistant stainless steel.

The invention has the beneficial technical effects that:

the invention provides a negative pressure multiple-effect evaporation device for treating nickel-phosphorus-plated waste liquid, wherein the nickel-phosphorus-plated waste liquid enters a gas distribution pipe in a first evaporation cavity after being preheated by a heat exchange cavity, uniformly enters the first evaporation cavity through the gas distribution pipe, is heated by a spiral evaporator until the nickel-phosphorus-plated waste liquid boils to generate steam, then floating particulate matters are removed by a first demisting assembly, so that the steam is filtered to enter the heat exchange cavity through a gas collecting pipe to preheat the continuously entering nickel-phosphorus-plated waste liquid, the nickel-phosphorus-plated waste liquid subjected to primary concentration is pumped into the gas distribution pipe in a second evaporation cavity through a first vacuum pump, then enters the second evaporation cavity through the gas distribution pipe, is heated by a second spiral evaporator until the nickel-phosphorus-plated waste liquid boils to generate steam, then floating particulate matters are removed by a second demisting assembly, so that the steam is filtered to enter the heat exchange cavity through the gas collecting pipe to preheat the continuously entering nickel-phosphorus-plated waste liquid, the second vacuum pump pumps the concentrated nickel-phosphorus-plated waste liquid for the second time into a gas distribution pipe inside a third evaporation cavity, the third spiral evaporator is heated until the nickel-phosphorus-plated waste liquid boils to generate steam, floating particulate matters are removed through a third demisting assembly, the steam is filtered to enable the steam to enter a heat exchange cavity through a gas collecting pipe to preheat the continuously entering nickel-phosphorus-plated waste liquid, the finally generated high-concentration nickel-phosphorus-plated waste liquid is collected, liquefied steam is discharged through the heat exchange cavity, the steam evaporated in each effect is cooled through the heat exchange cavity to become cooling water through three-level concentration, the steam can be discharged up to standard, the third evaporation cavity is thick concentrated liquid with the water content of about 50%, and the steam is cooled through the heat exchange of the heat exchange cavity to reduce the damage of energy.

Drawings

FIG. 1 is a side sectional view of a preferred embodiment of the negative pressure multi-effect evaporation device for nickel and phosphorus plating waste liquid treatment according to the invention;

FIG. 2 is an enlarged view of the structure at the A position of a preferred embodiment of the negative pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating according to the invention;

FIG. 3 is a top view of a water distribution pipe of a preferred embodiment of the negative pressure multi-effect evaporation device for treating waste liquid of nickel and phosphorus plating according to the invention;

FIG. 4 is a top view of an evaporator of a preferred embodiment of the negative pressure multi-effect evaporation device for treating waste liquid of nickel and phosphorus plating according to the invention;

FIG. 5 is a side view of a demisting structure of a preferred embodiment of the negative-pressure multi-effect evaporation device for treating waste liquid of nickel and phosphorus plating according to the invention;

FIG. 6 is a schematic diagram of a first demister structure of a preferred embodiment of the negative pressure multi-effect evaporation apparatus for treating waste liquid of nickel and phosphorus plating;

FIG. 7 is an enlarged view of the structure at the position B of a preferred embodiment of the negative-pressure multi-effect evaporation device for treating the waste liquid of nickel and phosphorus plating according to the invention;

FIG. 8 is a schematic diagram of a second demister structure of a preferred embodiment of the negative pressure multi-effect evaporation apparatus for treating waste liquid of nickel and phosphorus plating;

fig. 9 is a schematic diagram of a third demister structure of a preferred embodiment of the negative pressure multi-effect evaporation apparatus for treating waste liquid of nickel and phosphorus plating.

In the figure: 1-a first vacuum pump, 2-a liquid discharge standpipe, 3-a connecting cavity, 4-a first nickel-phosphorus plating waste liquid discharge pipe, 5-a second vacuum pump, 6-a second nickel-phosphorus plating waste liquid discharge pipe, 7-a third spiral evaporator, 8-a third evaporation cavity, 9-a third demisting component, 10-a second evaporation cavity, 11-a first evaporation cavity, 12-a second demisting component, 13-a first demisting component, 14-a heat exchange cavity, 15-a steam gathering cavity, 16-a steam liquefaction cavity, 17-a high-temperature steam heat exchange pipe, 18-a low-temperature nickel-phosphorus plating waste liquid heat exchange pipe, 19-a gas collecting pipe, 20-a third heater, 21-a second heater, 22-a first heater, 23-a second spiral evaporator and 24-a first spiral evaporator, 25-evaporator liquid discharge pipe, 26-spiral blade, 27-stirring blade, 28-exhaust port, 29-shell, 30-main gas distribution pipe, 31-gas distribution pipe, 32-auxiliary gas distribution pipe, 33-concentrated nickel-phosphorus plating waste liquid discharge pipe, 34-liquefied steam discharge pipe, 35-heat conduction aluminum alloy rod, 36-arc baffle, 37-first demisting plate, 38-second demisting plate, 39-third demisting plate and 40-limiting spring.

Detailed Description

In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1-9, the negative pressure multiple-effect evaporation device for treating nickel-phosphorus plating waste liquid provided in this embodiment includes a housing 29, and a third evaporation chamber 8, a second evaporation chamber 10 and a first evaporation chamber 11 sequentially arranged from bottom to top inside the housing 29, the lateral tops of the third evaporation chamber 8, the second evaporation chamber 10 and the first evaporation chamber 11 are all provided with an exhaust port 28, the exhaust port 28 is connected with a heat exchange chamber 14 through a gas collecting pipe 19, the lower parts inside the third evaporation chamber 8, the second evaporation chamber 10 and the first evaporation chamber 11 are all provided with a support net rack, the lower parts of the support net racks inside the third evaporation chamber 8, the second evaporation chamber 10 and the first evaporation chamber 11 are all provided with a gas distribution pipe 31 having one end communicated with the outer wall of the housing 29, the upper part of the support net rack inside the third evaporation chamber 8 is provided with a third spiral evaporator 7, and the upper part of the third spiral evaporator 7 is provided with a third defogging assembly 9, a second spiral evaporator 23 is arranged above a support net rack in the second evaporation cavity 10, a second demisting component 12 is arranged above the second spiral evaporator 23, a first spiral evaporator 24 is arranged above the support net rack in the first evaporation cavity 11, a first demisting component 13 is arranged above the first spiral evaporator 24, a first vacuum pump 1 is arranged at the bottom of the side of the first evaporation cavity 11, the first vacuum pump 1 is communicated with a gas distribution pipe 31 at the bottom in the second evaporation cavity 10 through a first nickel-phosphorus-plated waste liquid discharge pipe 4, a second vacuum pump 5 is arranged at the bottom of the side of the second evaporation cavity 10, the second vacuum pump 5 is communicated with the gas distribution pipe 31 at the bottom in the third evaporation cavity 8 through a second nickel-phosphorus-plated waste liquid discharge pipe 6, a first heater 22, a second heater 21 and a third heater 20 are respectively arranged at the top of the sides of the first evaporation cavity 11, the second evaporation cavity 10 and the third evaporation cavity 8, the inner side ends of the first spiral evaporator 24, the second spiral evaporator 23 and the third spiral evaporator 7 are connected with an evaporation liquid discharge pipe 25 penetrating to the outside of the shell 29, and one end of the evaporation liquid discharge pipe 25 positioned at the outside of the shell 29 is communicated with a liquid discharge vertical pipe 2.

The nickel-phosphorus-plated waste liquid enters the gas distribution pipe 31 in the first evaporation cavity 11 after being preheated by the heat exchange cavity 14, and uniformly enters the first evaporation cavity 11 through the gas distribution pipe 31, and is heated to boil the nickel-phosphorus-plated waste liquid through a spiral evaporator 24 to generate steam, floating particulate matters are removed through the first demisting assembly 13, so that the steam is filtered to enter the heat exchange cavity 14 through the gas collecting pipe 19 to preheat the nickel-phosphorus-plated waste liquid which continuously enters, the nickel-phosphorus-plated waste liquid which is subjected to the first concentration is pumped into the gas distribution pipe 31 in the second evaporation cavity 10 through the first vacuum pump 1, then enters the second evaporation cavity 10 through the gas distribution pipe 31, is heated to boil the nickel-phosphorus-plated waste liquid through the second spiral evaporator 23 to generate steam, the floating particulate matters are removed through the second demisting assembly 12, so that the steam is filtered to enter the heat exchange cavity 14 through the gas collecting pipe 19 to preheat the nickel-phosphorus-plated waste liquid which continuously enters, the second vacuum pump 5 pumps the concentrated waste liquid into the gas distribution pipe 31 in the third evaporation cavity 8, the third spiral evaporator 7 heats the waste liquid to boil to generate steam, and the third demisting assembly 9 removes floating particulate matters, so that the steam is filtered to enter the heat exchange cavity 14 through the gas collecting pipe 19 to preheat the continuously entering waste liquid, the finally generated high-concentration waste liquid is collected, and liquefied steam is discharged through the heat exchange cavity 14.

In this embodiment, the spiral blades 26 are installed at the middle position of the outer bottom of the first evaporation cavity 11 and the middle position of the outer bottom of the second evaporation cavity 10, the rotating rod penetrating through the bottom of the evaporation cavity is installed at the top of the spiral blade 26, the stirring blade 27 is installed at one end of the rotating rod located inside the evaporation cavity, the stirring blade 27 is a high temperature resistant flexible rod, and the spiral blade 26 is a stainless steel blade.

Drive spiral leaf 26 through high temperature steam behind exhaust opening 28 and rotate, drive the bull stick through spiral leaf 26 and rotate, drive stirring leaf 27 through the bull stick and rotate to the function of nickel phosphorus waste liquid stirring is plated to the realization in corresponding evaporation cavity, thereby has improved evaporation efficiency.

In this embodiment, the interior top in heat transfer chamber 14 is equipped with steam gathering chamber 15, the interior bottom in heat transfer chamber 14 is equipped with steam liquefaction chamber 16, the intercommunication has helical structure's high temperature steam heat exchange tube 17 between steam gathering chamber 15 and the steam liquefaction chamber 16, the outside spiral cooperation of high temperature steam heat exchange tube 17 has low temperature nickel-phosphorus plating waste liquid heat exchange tube 18, the bottom of heat transfer chamber 14 is run through to the one end of this low temperature nickel-phosphorus plating waste liquid heat exchange tube 18, the other end of low temperature nickel-phosphorus plating waste liquid heat exchange tube 18 run through the top in heat transfer chamber 14 and communicate with the inside gas distribution pipe 31 in first evaporation chamber 11.

The high-temperature steam enters a steam gathering cavity 15 in the heat exchange cavity 14 and then exchanges heat with a low-temperature nickel-phosphorus plating waste liquid heat exchange pipe 18 flowing with the nickel-phosphorus plating waste liquid through a high-temperature steam heat exchange pipe 17, and the liquefied high-temperature steam is gathered in a steam liquefying cavity 16 and then discharged.

In the present embodiment, the air distribution pipe 31 includes a main air distribution pipe 30 extending from one end to the other end along the inner diameter of the housing 29, auxiliary air distribution pipes 32 are connected to both sides of the main air distribution pipe 30 at equal intervals along the axial direction thereof, and through holes are provided in the auxiliary air distribution pipes 32 and the main air distribution pipe 30.

The nickel-phosphorus-plated waste liquid enters the main gas distribution pipe 30 and then is dispersed to the auxiliary gas distribution pipe 32 through the main gas distribution pipe 30, so that the nickel-phosphorus-plated waste liquid can uniformly enter the nickel-phosphorus-plated waste liquid, the heating area is further increased, and the evaporation efficiency is improved.

In this embodiment, first defogging subassembly 13, second defogging subassembly 12 and third defogging subassembly 9 are all including installing the second defogging board 38 of roof in its evaporation chamber one side and installing the third defogging board 39 of roof in its evaporation chamber opposite side, second defogging board 38 has the dead lever with the welding of third defogging board 39 both ends, the outside of this dead lever is equipped with first defogging board 37 along its axial equidistant, first defogging board 37 is vertical W structure, its turn portion all is equipped with connects chamber 3, connect chamber 3 interior top and interior bottom and all install spacing spring 40, spacing spring 40 keeps away from the one end of connecting the intracavity 3 inner wall and installs cowl 36, this cowl 36 articulates the inboard at connecting chamber 3.

High temperature steam passes through behind the defogging board and realizes filtering after realizing blockking of particulate matter under cowl 36's cooperation, designs first defogging board 37 for perpendicular shape W structure, has further improved filterable ability, articulates the inboard that connects chamber 3 through spacing spring 40 and cowl 36 and has realized that the atress wobbling blocks the function.

In this embodiment, the arc baffle 36 is located outside the connecting chamber 3 and bends downward, a rubber layer is connected between the arc baffle 36 and the connecting chamber 3, the third defogging plate 39 is of a semicircular structure, the middle part of the semicircular structure is also provided with the connecting chamber 3, the arc baffle 36 and the limiting spring 40, the middle part of the second defogging plate 38 is of a vertical structure, and the top end and the bottom end of the middle part are also provided with the connecting chamber 3, the arc baffle 36 and the limiting spring 40.

In this embodiment, the third spiral evaporator 7, the second spiral evaporator 23 and the first spiral evaporator 24 are all multiple groups of vertical pipes and are sequentially arranged through the communication of semicircular pipes to form a spiral structure, the outer sides of the third spiral evaporator 7, the second spiral evaporator 23 and the first spiral evaporator 24 of the spiral structure are welded with heat-conducting aluminum alloy rods 35 parallel to the vertical pipes, and the outer end parts of the third spiral evaporator 7, the second spiral evaporator 23 and the first spiral evaporator 24 are communicated with the outer wall of the shell 29.

Arrange in proper order through semi-circular body intercommunication from top to bottom through adopting the vertical body of multiunit and constitute helical structure and improved the area of contact with the waste liquid, and then improved evaporation efficiency to heat conduction aluminum alloy pole 35 through parallel vertical body still has the function of heat conduction when realizing fixing.

In this embodiment, the four corners of the bottom of the casing 29 and the four corners of the bottom of the heat exchange cavity 14 are welded with support legs, the middle position of the bottom of the casing 29 is communicated with a concentrated nickel-phosphorus plated waste liquid discharge pipe 33, one end of the concentrated nickel-phosphorus plated waste liquid discharge pipe 33 inside the casing 29 is communicated with the inside of the third evaporation cavity 8, and the bottom of the vapor liquefaction cavity 16 is communicated with a liquefied vapor discharge pipe 34.

In this embodiment, the fixing rods, the first defogging plate 37, the third defogging plate 39, the second defogging plate 38, the limiting spring 40, the connecting cavity 3 and the arc-shaped baffle 36 are all made of high temperature resistant stainless steel.

The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.