Multi-effect evaporation and concentration device for producing calcium-magnesium fertilizer by using byproduct sulfuric acid

Abstract

The invention belongs to the technical field of concentration equipment, and particularly relates to a multi-effect evaporation concentration device for producing calcium-magnesium fertilizer by using byproduct sulfuric acid, the multi-effect evaporation concentration device comprises a mounting rack, the upper part of the mounting rack is fixedly connected with a plurality of evaporation parts, and steam generated by the evaporation parts can be used as a heating source of the next evaporation part; the first evaporation part is connected with external steam generation equipment; the steam outlet of the last evaporation part, the steam connecting pipe and the condensate pipe are connected with a condensation part, the condensation part can stir surrounding air through steam discharged by the evaporation part, rapid cooling and condensation of the steam in the condensation part are accelerated, and liquid obtained after steam condensation is collected. Steam generated by the multiple evaporators can communicate with one another to form a heating source, the utilization rate of steam heat is increased, meanwhile, air around the cooling part can be stirred through pressure generated when the steam is exhausted, the temperature outside the cooling part is rapidly reduced, and the temperature difference inside and outside the cooling part is increased to accelerate steam condensation.

Description

Technical Field

[0001] The invention belongs to the technical field of concentration equipment, and in particular relates to a multi-effect evaporation concentration device for producing calcium and magnesium fertilizers by utilizing by-product sulfuric acid. Background Art

[0002] In modern industrial production, the comprehensive utilization of by-products has become an important means to achieve resource circulation and reduce environmental pollution. Among them, by-product sulfuric acid is a common chemical by-product, which is usually produced in the production process of various sulfur-containing raw materials, such as the absorption process of sulfur dioxide in smelting flue gas. Traditional treatment methods have problems such as large investment, high energy consumption, and complex operation, resulting in waste of resources and increased environmental pressure.

[0003] Calcium magnesium fertilizer is an important agricultural fertilizer that can provide crops with essential medium-element nutrients, improve soil structure, and increase crop yield and quality. Using by-product sulfuric acid to produce calcium magnesium fertilizer can not only effectively recycle sulfur resources, but also reduce environmental pollution, with good economic and social benefits.

[0004] In the process of producing calcium magnesium fertilizer with by-product sulfuric acid, a multi-effect evaporation and concentration device is required for concentration operation. The multi-effect evaporation and concentration device works in series through multiple evaporators, and each evaporator is called an effect. The raw material liquid is heated when entering the first effect evaporator to generate a large amount of steam, which is then introduced into the second effect as a heating source, and so on, ultimately achieving multiple utilization of thermal energy.

[0005] However, as the solution concentration increases, the heat transfer coefficient of the last few effects gradually decreases. This effect is more obvious when processing materials with high viscosity, resulting in reduced heat transfer efficiency, which not only affects the evaporation rate but also increases energy consumption. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid, which can interconnect the steam generated by multiple evaporators to form a heating source, thereby improving the utilization rate of steam heat, and can also use the pressure when the steam is discharged to stir the air around the cooling part, so that the outside of the cooling part is quickly cooled, and the temperature difference between the inside and outside of the cooling part is increased to accelerate the condensation of steam.

[0007] The technical solution adopted by the present invention is as follows: A multiple-effect evaporation concentration device for producing calcium-magnesium fertilizer using by-product sulfuric acid comprises a mounting frame, a plurality of evaporation parts are fixedly connected to the upper part of the mounting frame, the steam generated by the evaporation part can be used as a heating source for the next evaporation part, and the first evaporation part is connected to an external steam generating device; The evaporation part includes a liquid storage tank, a circulation pump, an evaporation tank, an evaporation seat, an air guide plate, a flow guide pipe, a steam inlet, a steam outlet, a condensate pipe, a raw liquid connecting pipe, and a steam connecting pipe. The liquid storage tank is fixedly connected to the upper part of the mounting frame, the input end of the circulation pump is connected to the lower end of the liquid storage tank through a pipeline, and the lower end of the evaporation tank is connected to the input end of the circulation pump through a pipeline. The evaporation seat is fixedly arranged inside the evaporation tank, the air guide plate is arranged inside the evaporation seat, one end of the flow guide pipe is arranged inside the upper end of the evaporation tank, and the other end of the flow guide pipe is arranged inside the upper end of the liquid storage tank. The steam inlet is arranged at the upper end of one side of the evaporation tank, and the inner The steam outlet is arranged at the lower end of the other side of the evaporation tank, and the interior of the steam outlet is connected to the lower end of the interior of the evaporation seat, the steam outlet is connected to the lower end of the evaporation seat of the other evaporation part, one end of the condensate pipe is connected to the lower end of the interior of the evaporation seat, the other end of the condensate pipe is connected to the lower end of the evaporation seat of the other evaporation part, one end of the raw liquid connecting pipe is connected to the input end of the circulation pump, the other end of the raw liquid connecting pipe is connected to the input end of the circulation pump of the other evaporation part, one end of the steam connecting pipe is connected to the upper end of the liquid storage tank, and the other end of the steam connecting pipe is connected to the steam inlet of the other evaporation part; The steam outlet, steam connecting pipe and condensate pipe of the last evaporation part are connected to the condensation part, and the condensation part can use the steam discharged from the evaporation part to stir the surrounding air, accelerate the rapid cooling and condensation of the steam inside the condensation part, and collect the liquid after the steam condenses.

[0008] In a preferred embodiment, a plurality of shunt pipes are vertically arranged inside the evaporation seat, and the shunt pipes connect the upper and lower ends of the evaporation tank.

[0009] In a preferred embodiment, the air guide plate is configured to be in the shape of a spiral blade, and the outer edge of the air guide plate is fixedly connected to the inner side of the evaporation tank.

[0010] In a preferred embodiment, the condensate pipe is arranged in a "X" shape, and the condensate pipe is arranged at the lower end of the steam outlet.

[0011] In a preferred embodiment, a conical nozzle is fixedly provided on the other end of the flow guide tube.

[0012] In a preferred embodiment, the condensation part includes an air inlet pipe, a mounting seat, a turbine, an external fan, a cooling pipe and a liquid collecting seat, one end of the air inlet pipe is connected to the corresponding steam outlet and the steam connecting pipe, the interior of the mounting seat is connected to the other end of the air inlet pipe, the turbine is rotatably arranged on the inner side of the mounting seat, the external fan is rotatably arranged inside the mounting seat, the upper end of the cooling pipe is fixedly connected to the lower end of the mounting seat, the interior of the cooling pipe cooperates with the turbine, the upper end of the liquid collecting seat is fixedly connected to the lower end of the cooling pipe, and the interior of the liquid collecting seat is connected to the interior of the condensate pipe.

[0013] In a preferred embodiment, the other end of the air inlet pipe cooperates with a wheel blade on one side of the outer edge of the turbine, and the exhaust port is opened at the lower end of the mounting seat to cooperate with the other side of the turbine.

[0014] In a preferred embodiment, a magnet is fixedly provided inside the turbine, and a magnet that attracts the magnet inside the turbine is fixedly provided on the inner side of the outer fan.

[0015] In a preferred embodiment, the cooling tube is divided into an inner tube and an outer tube, and the inner tube and the outer tube are matched with the steam exhaust port inside the mounting seat.

[0016] In a preferred embodiment, a plurality of fins are fixedly provided on the outer edges of the inner tube and the outer tube.

[0017] The technical effects achieved by the present invention are: The present invention adopts the design of an evaporation seat and an air guide plate, and can divert the raw liquid flowing through the evaporation seat through a plurality of diversion pipes, thereby increasing the contact area between the evaporation seat and the raw liquid, and increasing the efficiency of the steam heat of the evaporation seat being transferred to the raw liquid. At the same time, the spiral air guide plate can not only increase the contact area between the air guide plate and the steam, but also increase the retention time of the steam inside the evaporation seat, so that the air guide plate can better absorb the heat of the steam and transfer it to the evaporation seat, further increasing the utilization rate of the steam. The present invention adopts the design of turbine and outer fan, and through the magnets that attract each other between the inner side of the outer fan and the inner side of the turbine, the turbine can drive the outer fan to rotate through the mounting seat, so that the interior of the mounting seat becomes an integrally closed whole, which can prevent steam from leaking from the interior of the mounting seat and ensure the transportation of steam; The present invention adopts a cooling tube design, and the contact area between the cooling tube and the steam and the external air can be effectively increased through the design of the inner tube and the outer tube. The large-area contact between the inner tube and the outer tube and the steam can better absorb the heat of the steam and accelerate the efficiency of steam condensation. At the same time, the large-area contact between the inner tube and the outer tube and the air can better dissipate the heat into the air, so that a temperature difference is formed inside and outside the cooling tube, thereby accelerating the efficiency of steam condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is an overall schematic diagram of an embodiment of the present invention; Figure 2 is a schematic diagram of an evaporation section of an embodiment of the present invention; Figure 3 is a side cross-sectional view of an evaporation portion of an embodiment of the present invention; Figure 4 is a side cross-sectional view of an evaporation tank according to an embodiment of the present invention; Figure 5 Schematic diagram of an evaporation seat and an air guide plate according to an embodiment of the present invention; Figure 6 is a cross-sectional view of a flow guide tube according to an embodiment of the present invention; Figure 7 is an exploded view of a cooling portion of an embodiment of the present invention; Figure 8 is a side cross-sectional view of a cooling portion of an embodiment of the present invention; Fig. 9 is a top view of the interior of a mounting base according to an embodiment of the present invention; Fig.10 Schematic diagram of a cooling tube according to an embodiment of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Mounting frame; 2. Evaporation part; 201. Liquid storage tank; 202. Circulation pump; 203. Evaporation tank; 204. Evaporation seat; 2041. Diverter pipe; 205. Air guide plate; 206. Flow guide pipe; 2061. Nozzle; 207. Steam inlet; 208. Steam outlet; 209. Condensate pipe; 2010. Raw liquid connecting pipe; 2011. Steam connecting pipe; 3. Condensation part; 301. Air inlet pipe; 302. Mounting seat; 303. Turbine; 304. External fan; 305. Cooling pipe; 3051. Inner pipe; 3052. Outer pipe; 306. Liquid collecting seat. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0023] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0024] See also Figures 1 to 10 As shown, the present invention provides a multiple-effect evaporation concentration device for producing calcium-magnesium fertilizer using by-product sulfuric acid, comprising a mounting frame 1, a plurality of evaporation parts 2 are fixedly connected to the upper part of the mounting frame 1, and the first evaporation part 2 is connected to an external steam generating device; The evaporation part 2 includes a liquid storage tank 201, a circulation pump 202, an evaporation tank 203, an evaporation seat 204, an air guide plate 205, a flow guide pipe 206, a steam inlet 207, a steam outlet 208, a condensate pipe 209, a raw liquid connecting pipe 2010, and a steam connecting pipe 2011. The liquid storage tank 201 is fixedly connected to the upper part of the mounting frame 1, the input end of the circulation pump 202 is connected to the lower end of the liquid storage tank 201 through a pipeline, the lower end of the evaporation tank 203 is connected to the input end of the circulation pump 202 through a pipeline, the evaporation seat 204 is fixedly arranged inside the evaporation tank 203, the air guide plate 205 is arranged inside the evaporation seat 204, one end of the flow guide pipe 206 is arranged inside the upper end of the evaporation tank 203, the other end of the flow guide pipe 206 is arranged inside the upper end of the liquid storage tank 201, the steam inlet 207 is arranged at the upper end of one side of the evaporation tank 203, and the steam The interior of the steam inlet 207 is connected to the upper end of the interior of the evaporation seat 204, the steam outlet 208 is arranged at the lower end of the other side of the evaporation tank 203, and the interior of the steam outlet 208 is connected to the lower end of the interior of the evaporation seat 204, the steam outlet 208 is connected to the lower end of the evaporation seat 204 of another evaporation part 2, one end of the condensate pipe 209 is connected to the lower end of the interior of the evaporation seat 204, the other end of the condensate pipe 209 is connected to the lower end of the evaporation seat 204 of another evaporation part 2, one end of the raw liquid connecting pipe 2010 is connected to the input end of the circulation pump 202, the other end of the raw liquid connecting pipe 2010 is connected to the input end of the circulation pump 202 of another evaporation part 2, one end of the steam connecting pipe 2011 is connected to the upper end of the liquid storage tank 201, and the other end of the steam connecting pipe 2011 is connected to the steam inlet 207 of another evaporation part 2; The steam outlet 208, steam connecting pipe 2011 and condensate pipe 209 of the last evaporation section 2 are connected to the condensation section 3. The condensation section 3 can use the steam discharged from the evaporation section 2 to stir the surrounding air, accelerate the rapid cooling and condensation of the steam inside the condensation section 3, and collect the condensed liquid.

[0025] Specifically, a mixed solution consisting of by-product sulfuric acid and a certain proportion of calcined dolomite, magnesite and marble is pumped into the liquid storage tank 201, and at the same time, an external steam generator introduces steam into the evaporation seat 204 through the steam inlet 207 to complete the preliminary preparation; The circulation pump 202 of the first evaporation section 2 draws the liquid at the bottom of the liquid storage tank 201 to the bottom of the evaporation tank 203. In the process of the output end of the circulation pump 202 delivering the liquid to the inside of the evaporation tank 203, a part of the liquid flows into the circulation pump 202 of the next evaporation section 2 through the stock liquid connecting pipe 2010, and the stock liquid is replenished in the inside of the next evaporation section 2. Then, the liquid in the evaporation tank 203 is injected, so that the liquid flows into the upper end of the evaporation tank 203 through the inside of the evaporation seat 204, until the liquid flows back into the inside of the liquid storage tank 201 through the guide pipe 206, so that the liquid forms a first circulation in the inside of the liquid storage tank 201 and the evaporation tank 203; When the raw liquid flows to the inside of the evaporation seat 204, since the inside of the evaporation seat 204 is filled with heated steam and is in a high temperature state, the raw liquid can absorb the heat of the evaporation seat 204 when flowing through the evaporation seat 204, thereby heating the raw liquid so that the water in the raw liquid forms high-temperature steam after being discharged through the inside of the guide tube 206 due to the high temperature, so that the raw liquid undergoes the first evaporation of water, and the raw liquid flows through the inside of multiple evaporation parts 2 for multiple evaporation concentrations to obtain the final concentrated raw liquid; After the water in the original liquid forms steam due to the high temperature, the newly generated steam enters the steam inlet 207 of another evaporation part 2 through the steam connecting pipe 2011 at the upper end of the liquid storage tank 201, and then enters the evaporation seat 204 of another evaporation part 2. The newly generated steam participates in the heating of the original liquid of the next evaporation part 2. After the water in the stock solution evaporates, it is discharged to the external precipitation device for precipitation and condensation into calcium magnesium fertilizer; It should be noted that the steam inside the first evaporation section 2 is generated by an external steam generator and is referred to as original steam below. The original steam is first injected from the upper end of the evaporation seat 204 and guided by the air guide plate 205 to move to the lower end of the evaporation seat 204. Then, the original steam is discharged to the lower end of the evaporation seat 204 of the next evaporation section 2 through the steam outlet 208. At this time, the evaporation seat 204 of the next evaporation section 2 contains original steam and new steam as heating sources, which can fully utilize the heat of the original steam and new steam to pass enough heat to the next evaporation seat 204, thereby improving the steam utilization rate. When the steam is inside the evaporation seat 204, due to heat conduction, the steam condenses into liquid inside the evaporation seat 204, and the liquid is gathered at the lower end of the evaporation seat 204 due to gravity, so that the liquid can flow through the condensation pipe 209 at the lower end of each evaporation seat 204 to the inside of the condensation part 3 and be discharged.

[0026] See also Figure 5 As shown, a plurality of shunt pipes 2041 are vertically arranged inside the evaporation seat 204, and the shunt pipes 2041 connect the upper and lower ends of the interior of the evaporation tank 203. The raw liquid flowing through the evaporation seat 204 can be shunt through the plurality of shunt pipes 2041, thereby increasing the contact area between the evaporation seat 204 and the raw liquid, thereby increasing the efficiency of transferring the steam heat from the evaporation seat 204 to the raw liquid, and improving the heating rate of the raw liquid.

[0027] See also Figure 5 As shown, the air guide plate 205 is configured to be in the shape of a spiral blade, and the outer edge of the air guide plate 205 is fixedly connected to the inner side of the evaporation tank 203. The spiral path formed by the steam passing through the air guide plate 205 can not only increase the contact area between the air guide plate 205 and the steam, but also increase the residence time of the steam inside the evaporation seat 204, so that the air guide plate 205 can better absorb the heat of the steam and conduct it to the evaporation seat 204, thereby further increasing the utilization rate of the steam.

[0028] See also Figure 2 and Figure 4 As shown, the condensate pipe 209 is arranged in a "J" shape, and the condensate pipe 209 is arranged at the lower end of the steam outlet 208, so that the condensate pipe 209 can be closed at both ends after being filled with condensed liquid, so that only the steam outlet 208 and the steam connecting pipe 2011 inside the corresponding evaporator 203 can serve as steam discharge outlets, which can prevent the external cold air from entering the interior of the evaporation seat 204 through the interior of the condensate pipe 209 after the condensed liquid is discharged, causing the heat inside the evaporation seat 204 to be lost, thereby ensuring the steam utilization rate.

[0029] See also Figure 3 and Figure 6As shown, a conical nozzle 2061 is fixedly provided at the other end of the guide tube 206. The heated raw liquid is dispersed and sprayed out through the interior of the nozzle 2061, thereby increasing the contact area between the raw liquid and the air, so that the heated water in the raw liquid can form steam and separate from the raw liquid more quickly, thereby improving the production efficiency of new steam and the concentration efficiency of the raw liquid.

[0030] See also Figure 7 As shown, the condensation part 3 includes an air inlet pipe 301, a mounting seat 302, a turbine 303, an external fan 304, a cooling pipe 305 and a liquid collecting seat 306. One end of the air inlet pipe 301 is connected to the corresponding steam outlet 208 and the steam connecting pipe 2011, the interior of the mounting seat 302 is connected to the other end of the air inlet pipe 301, the turbine 303 is rotatably arranged on the inner side of the mounting seat 302, the external fan 304 is rotatably arranged inside the mounting seat 302, the upper end of the cooling pipe 305 is fixedly connected to the lower end of the mounting seat 302, the interior of the cooling pipe 305 cooperates with the turbine 303, the upper end of the liquid collecting seat 306 is fixedly connected to the lower end of the cooling pipe 305, and the interior of the liquid collecting seat 306 is connected to the interior of the condensate pipe 209; The steam outlet 208 and the steam connecting pipe 2011 transport the high-pressure steam to the inside of the air inlet pipe 301. The high-pressure steam contacts the outer edge of the turbine 303 to drive the turbine 303 to rotate until the turbine 303 rotates to the discharge port inside the mounting seat 302. The high-pressure steam is discharged to the inside of the cooling pipe 305, so that the steam contacts the inside of the cooling pipe 305, so that the steam is condensed into liquid inside the cooling pipe 305 and then discharged. During the rotation of the turbine 303, the external fan 304 inside the mounting base 302 can be driven to rotate. The rotation of the external fan 304 can stir the outside air to blow to the outside of the cooling pipe 305, accelerate the cooling of the outside of the cooling pipe 305, and form a temperature difference between the inside and outside of the cooling pipe 305, thereby increasing the steam condensation efficiency inside the cooling pipe 305.

[0031] See also Fig. 9 As shown, the other end of the air inlet pipe 301 cooperates with the wheel on one side of the outer edge of the turbine 303, and the exhaust port at the lower end of the mounting seat 302 cooperates with the other side of the turbine 303. When the steam is discharged from the air inlet pipe 301, it is blown toward the turbine on one side of the turbine 303, applying oblique power to the turbine 303, which is convenient for the steam to drive the turbine 303, until the turbine 303 carrying the steam rotates to the other side of 303 and the exhaust port opened at the lower end of the mounting seat 302, so that the steam is discharged, thereby improving the utilization efficiency of the steam.

[0032] See also Fig. 9As shown, a magnet is fixedly provided inside the turbine 303, and a magnet that attracts the magnet inside the turbine 303 is fixedly provided on the inner side of the outer fan 304. The turbine 303 can drive the outer fan 304 to rotate through the mounting base 302 through magnetic attraction, so that the interior of the mounting base 302 becomes an integrally closed whole, which can ensure that the turbine 303 can use the magnetic force to drive the outer fan 304 to rotate together when rotating, and can also prevent steam from leaking from the inside of the mounting base 302, thereby ensuring the transportation of steam.

[0033] See also Figures 7 to 10 As shown, the cooling tube 305 is divided into an inner tube 3051 and an outer tube 3052. The inner tube 3051 and the outer tube 3052 cooperate with the steam exhaust port inside the mounting base 302. The design of the inner tube 3051 and the outer tube 3052 can effectively increase the contact area between the cooling tube 305 and the steam and the external air. The large-area contact between the inner tube 3051 and the outer tube 3052 and the steam can better absorb the heat of the steam and accelerate the efficiency of steam condensation. The large-area contact between the inner tube 3051 and the outer tube 3052 and the air can better dissipate the heat into the air, so that a temperature difference is formed between the inside and outside of the cooling tube 305, thereby accelerating the efficiency of steam condensation.

[0034] See also Figure 7 , Fig. 9 and Fig.10 As shown, the outer edges of the inner tube 3051 and the outer tube 3052 are fixedly provided with a plurality of fins, and the contact areas of the inner tube 3051 and the outer tube 3052 with steam and air can be further increased through the fins, thereby further improving the condensation efficiency of the steam.

[0035] The working principle of the present invention is as follows: a mixed stock solution consisting of by-product sulfuric acid and a certain proportion of calcined dolomite, magnesite and marble is pumped into the interior of the liquid storage tank 201, and at the same time, an external steam generator introduces steam into the interior of the evaporation seat 204 through the steam inlet 207 to complete the preliminary preparation; The circulation pump 202 of the first evaporation section 2 draws the liquid at the bottom of the liquid storage tank 201 to the bottom of the evaporation tank 203. In the process of the output end of the circulation pump 202 delivering the liquid to the inside of the evaporation tank 203, a part of the liquid flows into the circulation pump 202 of the next evaporation section 2 through the stock liquid connecting pipe 2010, and the stock liquid is replenished in the inside of the next evaporation section 2. Then, the liquid in the evaporation tank 203 is injected, so that the liquid flows into the upper end of the evaporation tank 203 through the inside of the evaporation seat 204, until the liquid flows back into the inside of the liquid storage tank 201 through the guide pipe 206, so that the liquid forms a first circulation in the inside of the liquid storage tank 201 and the evaporation tank 203; When the raw liquid flows to the inside of the evaporation seat 204, since the inside of the evaporation seat 204 is filled with heated steam and is in a high temperature state, the raw liquid can absorb the heat of the evaporation seat 204 when flowing through the evaporation seat 204, thereby heating the raw liquid so that the water in the raw liquid forms high-temperature steam after being discharged through the inside of the guide tube 206 due to the high temperature, so that the raw liquid undergoes the first evaporation of water, and the raw liquid flows through the inside of multiple evaporation parts 2 for multiple evaporation concentrations to obtain the final concentrated raw liquid; After the water in the original liquid forms steam due to the high temperature, the newly generated steam enters the steam inlet 207 of another evaporation part 2 through the steam connecting pipe 2011 at the upper end of the liquid storage tank 201, and then enters the evaporation seat 204 of another evaporation part 2. The newly generated steam participates in the heating of the original liquid of the next evaporation part 2. After the water in the stock solution evaporates, it is discharged to the external precipitation device for precipitation and condensation into calcium magnesium fertilizer; It should be noted that the steam inside the first evaporation section 2 is generated by an external steam generator and is referred to as original steam below. The original steam is first injected from the upper end of the evaporation seat 204 and guided by the air guide plate 205 to move to the lower end of the evaporation seat 204. Then, the original steam is discharged to the lower end of the evaporation seat 204 of the next evaporation section 2 through the steam outlet 208. At this time, the evaporation seat 204 of the next evaporation section 2 contains original steam and new steam as heating sources, which can fully utilize the heat of the original steam and new steam to pass enough heat to the next evaporation seat 204, thereby improving the steam utilization rate. When the steam is inside the evaporation seat 204, due to heat conduction, the steam condenses into liquid inside the evaporation seat 204, and the liquid is gathered at the lower end of the evaporation seat 204 due to gravity, so that the liquid can flow through the condensation pipe 209 at the lower end of each evaporation seat 204 to the inside of the condensation part 3 and be discharged.

[0036] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid, characterized in that: It comprises a mounting frame (1), a plurality of evaporating parts (2) being fixedly connected to the upper part of the mounting frame (1), the steam generated by the evaporating parts (2) being capable of serving as a heating source for the next evaporating part (2), the first evaporating part (2) being connected to an external steam generating device; The evaporation part (2) comprises a liquid storage tank (201), a circulation pump (202), an evaporation tank (203), an evaporation seat (204), an air guide plate (205), a flow guide pipe (206), a steam inlet (207), a steam outlet (208), a condensate pipe (209), a raw liquid connecting pipe (2010), and a steam connecting pipe (2011); the liquid storage tank (201) is fixedly connected to the upper part of the mounting frame (1); the input end of the circulation pump (202) is connected to the lower end of the liquid storage tank (201) via a pipeline. The lower end of the evaporation tank (203) is connected to the input end of the circulation pump (202) through a pipeline, the evaporation seat (204) is fixedly arranged inside the evaporation tank (203), the air guide plate (205) is arranged inside the evaporation seat (204), one end of the flow guide pipe (206) is arranged inside the upper end of the evaporation tank (203), the other end of the flow guide pipe (206) is arranged inside the upper end of the liquid storage tank (201), and the steam inlet (207) is arranged on the upper side of one side of the evaporation tank (203). The evaporation tank (203) is provided with a steam inlet (207) and an inner portion thereof is connected to an upper end of the inner portion of the evaporation seat (204); the steam outlet (208) is arranged at a lower end of the other side of the evaporation tank (203); the inner portion of the steam outlet (208) is connected to a lower end of the inner portion of the evaporation seat (204); the steam outlet (208) is connected to a lower end of the inner portion of the evaporation seat (204) of another evaporation portion (2); one end of the condensate pipe (209) is connected to a lower end of the inner portion of the evaporation seat (204); the other end of the condensate pipe (209) is connected to a lower end of the inner portion of the evaporation seat (204); One end of the raw liquid connecting pipe (2010) is connected to the lower end of the evaporation seat (204) of the other evaporation part (2), one end of the raw liquid connecting pipe (2010) is connected to the input end of the circulation pump (202), the other end of the raw liquid connecting pipe (2010) is connected to the input end of the circulation pump (202) of the other evaporation part (2), one end of the steam connecting pipe (2011) is connected to the upper end of the liquid storage tank (201), and the other end of the steam connecting pipe (2011) is connected to the steam inlet (207) of the other evaporation part (2); The steam outlet (208), the steam connecting pipe (2011) and the condensate pipe (209) of the last evaporation section (2) are connected to a condensation section (3). The condensation section (3) can use the steam discharged from the evaporation section (2) to stir the surrounding air, accelerate the rapid cooling and condensation of the steam inside the condensation section (3), and collect the liquid after the steam condenses.

2. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 1, characterized in that: A plurality of shunt pipes (2041) are vertically arranged inside the evaporation seat (204), and the shunt pipes (2041) connect the upper and lower ends of the interior of the evaporation tank (203).

3. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 1, characterized in that: The air guide plate (205) is configured in the shape of a spiral blade, and the outer edge of the air guide plate (205) is fixedly connected to the inner side of the evaporation tank (203).

4. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 1, characterized in that: The condensate pipe (209) is arranged in a "J" shape, and the condensate pipe (209) is arranged at the lower end of the steam outlet (208).

5. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 1, characterized in that: A conical nozzle (2061) is fixedly provided at the other end of the flow guide pipe (206).

6. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 1, characterized in that: The condensation section (3) comprises an air inlet pipe (301), a mounting seat (302), a turbine (303), an external fan (304), a cooling pipe (305) and a liquid collecting seat (306); one end of the air inlet pipe (301) is connected to a corresponding steam outlet (208) and a steam connecting pipe (2011); the interior of the mounting seat (302) is connected to the other end of the air inlet pipe (301); the turbine (303) is rotatably arranged on the inner side of the mounting seat (302); the external fan (304) is rotatably arranged inside the mounting seat (302); the upper end of the cooling pipe (305) is fixedly connected to the lower end of the mounting seat (302); the interior of the cooling pipe (305) cooperates with the turbine (303); the upper end of the liquid collecting seat (306) is fixedly connected to the lower end of the cooling pipe (305); and the interior of the liquid collecting seat (306) is connected to the interior of the condensate pipe (209).

7. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 6, characterized in that: The other end of the air inlet pipe (301) cooperates with a wheel sheet on one side of the outer edge of the turbine (303), and the lower end of the mounting seat (302) is provided with an exhaust port which cooperates with the other side of the turbine (303).

8. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 6, characterized in that: A magnet is fixedly arranged inside the turbine (303), and a magnet that attracts the magnet inside the turbine (303) is fixedly arranged on the inner side of the outer fan (304).

9. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 6, characterized in that: The cooling pipe (305) is divided into an inner pipe (3051) and an outer pipe (3052), and the inner pipe (3051) and the outer pipe (3052) are matched with the steam discharge port inside the mounting seat (302).

10. A multiple-effect evaporation and concentration device for producing calcium and magnesium fertilizers using by-product sulfuric acid according to claim 9, characterized in that: The outer edges of the inner tube (3051) and the outer tube (3052) are both fixedly provided with a plurality of fins.

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