A calcium chloride evaporation energy-saving device

Abstract

The present application relates to a calcium chloride evaporation energy-saving device, including a multiple-effect evaporator, a flash tank, a circulation component, a feed component and a discharge component; the circulation component includes a circulation pump, a first circulation pipeline and a second circulation pipeline, the first circulation pipeline is used to connect the circulation pump and the liquid inlet of the flash tank, and the second circulation pipeline is used to connect the circulation pump and the liquid outlet of the flash tank; the feed component includes a feed pipeline and a liquid inlet regulating valve; the feed pipeline is used to connect the multiple-effect evaporator and the first circulation pipeline, the liquid inlet pipe is used to transport the calcium chloride solution from the multiple-effect evaporator to the flash tank, and the liquid inlet regulating valve is connected to the feed pipeline. In the present application, the circulation pump allows the calcium chloride to circulate continuously in the flash tank, separates water from the calcium chloride solution, and the concentration of the calcium chloride solution is continuously increased; at the same time, the overall energy consumption of the evaporation device is reduced, and the operation stability of the evaporation device is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and in particular to a calcium chloride evaporation energy-saving device. Background Art

[0002] Calcium chloride is an important inorganic chemical product, widely used in various industries. Calcium chloride is mainly used as a multi-purpose desiccant, such as for drying gases such as nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide, etc. It is used as a dehydrating agent in the production of alcohols, esters, ethers and acrylic resins. Calcium chloride aqueous solution can accelerate the hardening of concrete and increase the cold resistance of building mortar, and is an excellent building antifreeze agent.

[0003] In the calcium chloride treatment process, the low-solubility calcium chloride solution needs to be concentrated; in the prior art, the calcium chloride solution is often concentrated by a multiple-effect evaporator. The effect heating chamber is the core component of the multiple-effect evaporator, and multiple effect heating chambers can be set; the effect heating chamber can separate the water in the calcium chloride solution to achieve the purpose of concentration.

[0004] When the multi-effect evaporator uses three-effect evaporation of calcium chloride, the steam enters the effect heating chamber for heating, and the secondary steam generated in the effect heating chamber enters the next effect heating chamber as a heat source. And so on. After three effects of evaporation, the concentration of calcium chloride mother liquor with a concentration of 12-15% is concentrated to 35%.

[0005] However, as the device is running, scaling is continuously generated in the heating chamber of the effect body, which affects the heat exchange efficiency of steam, the steam energy consumption continues to rise, and the load of the evaporation device is also affected to a certain extent. As a result, the outlet solubility of the calcium chloride solution, that is, the concentration of the calcium chloride solution, is lower than 35%. If the multiple-effect evaporator is still used to concentrate the concentration of the calcium chloride solution to 35%, it will consume more energy and affect the stability of the operation of the multiple-effect evaporator. Utility Model Content

[0006] In order to reduce the overall energy consumption of the evaporation device and further improve the operating stability of the evaporation device; the present application provides a calcium chloride evaporation energy-saving device.

[0007] The present application provides a calcium chloride evaporation energy-saving device, which adopts the following technical solution:

[0008] A calcium chloride evaporation energy-saving device comprises a multiple-effect evaporator, a flash tank, a circulation component, a feeding component and a discharging component;

[0009] The circulation assembly includes a circulation pump, a first circulation pipeline and a second circulation pipeline, wherein the first circulation pipeline is used to connect the circulation pump with the liquid inlet of the flash tank, and the second circulation pipeline is used to connect the circulation pump with the liquid outlet of the flash tank;

[0010] The feed assembly includes a feed pipeline and a liquid inlet regulating valve; the feed pipeline is used to connect the multiple-effect evaporator and the first circulation pipeline, the feed pipeline is used to transport the calcium chloride solution from the multiple-effect evaporator to the flash tank, and the liquid inlet regulating valve is connected to the feed pipeline;

[0011] The discharging assembly includes a discharging pump, a discharging pipeline and a discharging regulating valve; the discharging pipeline is connected to the first circulation pipeline, and the discharging pump and the discharging regulating valve are connected to the discharging pipeline.

[0012] By adopting the above technical solution, the circulating pump allows the calcium chloride to circulate continuously in the flash tank, separating the water from the calcium chloride solution, and the concentration of the calcium chloride solution is continuously increased; so as to achieve the purpose of concentrating the calcium chloride solution to meet the concentration requirements of the calcium chloride solution before leaving the factory. At the same time, the overall energy consumption of the evaporation device is reduced, and the operating stability of the evaporation device is further improved.

[0013] Optionally, it also includes a vacuum component, which includes a vacuum pump and a vacuum pipe; the vacuum pump is connected to the flash tank through the vacuum pipe, and the vacuum component is used to reduce the gas pressure in the flash tank.

[0014] By adopting the above technical solution, the calcium chloride solution in the flash device itself has a certain temperature, so that gas-liquid separation can be performed under negative pressure conditions; the evaporation amount of water in the calcium chloride solution can be increased, so as to facilitate the efficiency of concentrating the calcium chloride solution.

[0015] Optionally, a condensation component is also included, which includes a condenser, a condensation pipe, an exhaust pipe and a drain pipe. The condenser is connected to the flash tank through the condensation pipe. The condenser is used to cool and separate the water vapor generated by the flash tank. The exhaust pipe and the drain pipe are both connected to the condenser. The exhaust pipe is used to discharge the separated gas, and the drain pipe is used to discharge the separated liquid water.

[0016] By adopting the above technical solution, the condensation component discharges the gaseous water in the flash tank in time, which is beneficial to the further evaporation of water in the calcium chloride solution.

[0017] Optionally, the drainage pipe is connected to the vacuum pipe.

[0018] By adopting the above technical solution, the gaseous water in the flash tank is discharged from the flash tank in time by utilizing the suction effect of the vacuum pump, which is beneficial to the further evaporation of the water in the calcium chloride solution.

[0019] Optionally, an exhaust regulating valve is provided on the exhaust pipe.

[0020] By adopting the above technical solution, when the vacuum pump is evacuating the flash tank, the staff can close the drain regulating valve to improve the vacuum pump's efficiency in evacuating the flash tank.

[0021] Optionally, a drainage regulating valve is provided on the drainage pipe.

[0022] By adopting the above technical solution, when the vacuum pump is evacuating the flash tank, the staff can close the drain regulating valve to improve the vacuum pump's efficiency in evacuating the flash tank.

[0023] Optionally, the discharge pump includes a first discharge pump and a second discharge pump, the first discharge pump is used as a working pump, and the second discharge pump is a standby pump.

[0024] By adopting the above technical solution, when the first discharge pump is damaged, the second discharge pump is started to work, so as to improve the operating stability of the evaporation device.

[0025] Optionally, the circulation pipe, the feed pipe and the discharge pipe are all made of titanium.

[0026] By adopting the above technical solution, the calcium chloride solution has a certain corrosiveness, and the circulation pipeline, the feed pipeline and the discharge pipeline are all made of titanium material, thereby improving the corrosion resistance of the pipeline to the calcium chloride solution.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The circulation pump allows the calcium chloride to circulate continuously in the flash tank, separating water from the calcium chloride solution, and the concentration of the calcium chloride solution is continuously increased; so as to achieve the purpose of concentrating the calcium chloride solution to meet the concentration requirements of the calcium chloride solution before leaving the factory; at the same time, the overall energy consumption of the evaporation device is reduced, and the operation stability of the evaporation device is further improved;

[0029] 2. The calcium chloride solution in the flash device has a certain temperature, so that it can be separated into gas and liquid under negative pressure; the evaporation of water in the calcium chloride solution can be increased, so as to increase the efficiency of concentrating the calcium chloride solution;

[0030] 3. The condensation component discharges the gaseous water in the flash tank in time, which is conducive to the further evaporation of water in the calcium chloride solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram embodying the structure of the calcium chloride evaporation energy-saving device in Example 1.

[0032] Figure 2 It is a schematic diagram embodying the structure of the calcium chloride evaporation energy-saving device in Example 2.

[0033] Explanation of the reference numerals: 1. Multi-effect evaporator; 2. Flash tank; 3. Circulation assembly; 31. Circulation pump; 32. First circulation pipeline; 33. Second circulation pipeline; 4. Feed assembly; 41. Feed pipeline; 42. Liquid inlet regulating valve; 5. Discharge assembly; 51. Discharge pump; 511. First discharge pump; 512. Second discharge pump; 52. Discharge pipeline; 53. Discharge regulating valve; 6. Condensation assembly; 61. Condenser; 62. Condensation pipeline; 63. Exhaust pipe; 631. Exhaust regulating valve; 64. Drain pipe; 641. Drain regulating valve; 7. Vacuum assembly; 71. Vacuum pump; 72. Vacuum pipeline; 8. Storage tank; 9. Water storage tank. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-2 This application is described in further detail.

[0035] The present application embodiment discloses a calcium chloride evaporation energy-saving device. Figure 1 The calcium chloride evaporation energy-saving device includes a multiple-effect evaporator 1, a flash tank 2 (also called a flash tank), a circulation component 3, a feed component 4, a discharge component 5 and a condensation component 6.

[0036] Reference Figure 1 , the multiple-effect evaporator 1 contains a plurality of effect body heating chambers. In the present embodiment, the multiple-effect evaporator 1 contains a plurality of effect body heating chambers to carry out a concentration operation on a calcium chloride mother liquor with a concentration of 12-15%. However, since scaling is continuously generated in the effect body heating chamber, the heat exchange efficiency of the steam is affected, the steam energy consumption is continuously increased, and the load of the evaporation device is also affected to a certain extent. As a result, the liquid solubility of the calcium chloride solution, that is, the concentration of the calcium chloride solution is lower than 35%, generally around 33%. If the multiple-effect evaporator 1 is still used to concentrate the concentration of the calcium chloride solution to 35%, more energy needs to be consumed, and the stability of the operation of the multiple-effect evaporator 1 will be affected.

[0037] Therefore, in the embodiment of the present application, the multiple-effect evaporator 1 concentrates the calcium chloride mother liquor with a concentration of 12-15% to a calcium chloride solution with a concentration of 33%; the flash tank 2 and the circulation component 3 concentrate the calcium chloride solution with a concentration of 33% to a calcium chloride solution with a concentration of 35%, so as to reduce the overall energy consumption of the evaporation device and further improve the operating stability of the evaporation device.

[0038] Reference Figure 1 The circulation assembly 3 includes a circulation pump 31, a first circulation pipe 32 and a second circulation pipe 33. The first circulation pipe 32 is used to connect the circulation pump 31 with the liquid inlet of the flash tank 2, and the second circulation pipe 33 is used to connect the circulation pump 31 with the liquid outlet of the flash tank 2.

[0039] Reference Figure 1The feed assembly 4 includes a feed pipeline 41 and a liquid inlet regulating valve 42. The feed pipeline 41 is used to connect the multiple-effect evaporator 1 with the first circulation pipeline 32, and the feed pipeline 41 is used to transport the calcium chloride solution from the multiple-effect evaporator 1 to the flash tank 2. The liquid inlet regulating valve 42 is connected to the feed pipeline 41 and is used to control the connection or closing of the feed pipeline 41.

[0040] Reference Figure 1 The discharge assembly 5 includes a discharge pump 51, a discharge pipe 52 and a discharge regulating valve 53; the discharge pipe 52 is connected to the first circulation pipe 32, and the discharge pump 51 and the discharge regulating valve 53 are connected to the discharge pipe 52. The end of the liquid discharge pipe is connected to the storage tank 8.

[0041] Since calcium chloride solution is corrosive to a certain extent, it is easy to scale and adhere to the surface of the pipeline during the concentration process. Therefore, the feed port and the discharge port of the flash tank 2 and the circulating pump 31 are both DN300 pipes; this reduces the impact of pipeline scaling on the flash device and improves the stable operation of the device. The discharge pipe 52, the circulation pipe and the feed pipe 41 are made of titanium material to improve the corrosion resistance of the pipe to the calcium chloride solution.

[0042] The implementation principle of a calcium chloride evaporation energy-saving device in the embodiment of the present application is:

[0043] Reference Figure 1 When the multi-effect evaporator 1 concentrates the calcium chloride mother liquor with a concentration of 12-15% to a calcium chloride solution with a concentration of about 33%, the staff opens the feed regulating valve and closes the discharge regulating valve 53, so that the calcium chloride solution in the multi-effect evaporator 1 flows into the flash tank 2 under pressure. Then, the staff closes the feed regulating valve, so that the flash tank 2 can dissolve and concentrate the calcium chloride.

[0044] The working principle of the flash tank 2 is based on the physical properties of the fluid, that is, the boiling point of the liquid decreases with the decrease of pressure. When the high-pressure and high-temperature calcium chloride solution enters the flash tank 2, due to the sudden decrease of the pressure in the tank, the temperature of the calcium chloride solution exceeds the boiling point of the calcium chloride solution under the pressure, which causes the calcium chloride solution to boil and vaporize rapidly, and perform two-phase separation, that is, gaseous water vapor is generated, thereby reducing the water content in the calcium chloride solution and improving the concentration of the calcium chloride solution. And the advantage of the flash tank 2 is that it can effectively recycle heat energy, improve energy utilization efficiency, and reduce energy waste.

[0045] Reference Figure 1Then, the circulation pump 31 is turned on to make the calcium chloride circulate continuously in the flash tank 2, separating the water from the calcium chloride solution, and the concentration of the calcium chloride solution is continuously increased; so as to achieve the concentration of calcium chloride solution of about 33% to about 35%, so as to meet the concentration requirements of the calcium chloride solution before leaving the factory. At the same time, the overall energy consumption of the evaporation device is reduced, and the operation stability of the evaporation device is further improved.

[0046] Finally, the staff opens the discharge regulating valve 53 and starts the discharge pump 51, thereby conveying the calcium chloride solution concentrated to 35% to the storage tank 8 for storage.

[0047] Reference Figure 1 The condensation assembly 6 includes a condenser 61, a condensation pipe 62, an exhaust pipe 63 and a drain pipe 64. The condenser 61 is connected to the flash tank 2 through the condensation pipe 62, and the condenser 61 is used to cool and separate the water vapor generated by the flash tank 2. The exhaust pipe 63 and the drain pipe 64 are both connected to the condenser 61. An exhaust regulating valve 631 is provided on the exhaust pipe 63, and the exhaust pipe 63 is used to discharge the separated gas. A drain regulating valve 641 is provided on the drain pipe 64, and the drain pipe 64 is used to discharge the separated liquid water; the end of the drain pipe 64 is connected to the water storage tank 9, and the water storage tank 9 is used to store the separated liquid water. When the vacuum pump 71 evacuates the flash tank 2, the staff can close the drain regulating valve 641 and the exhaust regulating valve 631 to improve the efficiency of the vacuum pump 71.

[0048] Example 2

[0049] The difference between this embodiment 2 and embodiment 1 is that:

[0050] Reference Figure 2 The calcium chloride evaporation energy-saving device also includes a vacuum component 7.

[0051] Reference Figure 2 , the vacuum assembly 7 includes a vacuum pump 71 and a vacuum pipe 72; the vacuum pump 71 is connected to the flash tank 2 through the vacuum pipe 72, and the vacuum assembly 7 is used to reduce the gas pressure in the flash tank 2. In this embodiment, the vacuum pump 71 controls the pressure in the flash tank 2 to about -65kpa, and the boiling point of the calcium chloride solution decreases as the gas pressure decreases. The calcium chloride solution in the flash device itself has a certain temperature, so that it can perform gas-liquid separation under negative pressure conditions; the evaporation amount of water in the calcium chloride solution can be increased, so as to facilitate the efficiency of concentrating the calcium chloride solution.

[0052] Reference Figure 2 The exhaust pipe 63 is connected to the vacuum pipe 72, so that the gaseous water in the flash tank 2 is discharged from the flash tank 2 in time by utilizing the suction of the vacuum pump 71, which is beneficial to the further evaporation of the water in the calcium chloride solution.

[0053] Reference Figure 2 In addition, the discharge pump 51 includes a first discharge pump 511 and a second discharge pump 512. The first discharge pump 511 is used as a working pump, and the second discharge pump 512 is a standby pump. Under normal circumstances, only the first discharge pump 511 is working, and the second discharge pump 512 is used as a standby pump; when the first discharge pump 511 is damaged, the second discharge pump 512 is started to work to improve the stability of the operation of the evaporation device.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A calcium chloride evaporation energy-saving device, characterized in that: It comprises a multiple-effect evaporator (1), a flash tank (2), a circulation component (3), a feed component (4) and a discharge component (5); The circulation assembly (3) comprises a circulation pump (31), a first circulation pipeline (32) and a second circulation pipeline (33), wherein the first circulation pipeline (32) is used to connect the circulation pump (31) with the liquid inlet of the flash tank (2), and the second circulation pipeline (33) is used to connect the circulation pump (31) with the liquid outlet of the flash tank (2); The feed assembly (4) comprises a feed pipeline (41) and a liquid inlet regulating valve (42); the feed pipeline (41) is used to connect the multiple-effect evaporator (1) and the first circulation pipeline (32); the feed pipeline (41) is used to transport the calcium chloride solution from the multiple-effect evaporator (1) to the flash tank (2); and the liquid inlet regulating valve (42) is connected to the feed pipeline (41); The discharge assembly (5) comprises a discharge pump (51), a discharge pipeline (52) and a discharge regulating valve (53); the discharge pipeline (52) is connected to the first circulation pipeline (32), and the discharge pump (51) and the discharge regulating valve (53) are connected to the discharge pipeline (52).

2. The calcium chloride evaporation energy-saving device according to claim 1, characterized in that: It also comprises a vacuum component (7), the vacuum component (7) comprising a vacuum pump (71) and a vacuum pipe (72); the vacuum pump (71) is connected to the flash tank (2) via the vacuum pipe (72), and the vacuum component (7) is used to reduce the gas pressure in the flash tank (2).

3. The calcium chloride evaporation energy-saving device according to claim 2, characterized in that: The invention also comprises a condensation assembly (6), wherein the condensation assembly (6) comprises a condenser (61), a condensation pipe (62), an exhaust pipe (63) and a drain pipe (64); the condenser (61) is connected to the flash tank (2) via the condensation pipe (62); the condenser (61) is used to cool and separate water vapor generated by the flash tank (2); the exhaust pipe (63) and the drain pipe (64) are both connected to the condenser (61); the exhaust pipe (63) is used to discharge the separated gas; and the drain pipe (64) is used to discharge the separated liquid water.

4. The calcium chloride evaporation energy-saving device according to claim 3, characterized in that: The exhaust pipe (63) is in communication with the vacuum pipe (72).

5. The calcium chloride evaporation energy-saving device according to claim 3, characterized in that: An exhaust regulating valve (631) is provided on the exhaust pipe (63).

6. The calcium chloride evaporation energy-saving device according to claim 3, characterized in that: The drainage pipe (64) is provided with a drainage regulating valve (641).

7. The calcium chloride evaporation energy-saving device according to claim 1, characterized in that: The discharge pump (51) comprises a first discharge pump (511) and a second discharge pump (512), wherein the first discharge pump (511) is used as a working pump, and the second discharge pump (512) is a standby pump.

8. The calcium chloride evaporation energy-saving device according to claim 1, characterized in that: The circulation pipeline, the feed pipeline (41) and the discharge pipeline (52) are all made of titanium.

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