Calcium chloride solution concentration production method and device

Abstract

The invention discloses a calcium chloride solution concentration production method and device, and the method comprises the following steps: respectively preheating a calcium chloride solution through a concentrated solution preheater, a condensate water preheater and a steam preheater, and feeding the preheated calcium chloride solution into an evaporator; live steam enters an evaporator to carry out heat exchange on the preheated calcium chloride solution, and the calcium chloride solution subjected to heat exchange enters a separator; the calcium chloride solution after heat exchange is subjected to gas-liquid separation in a separator until the concentration of the calcium chloride solution reaches the target concentration, and generated heat is input into a concentrated solution preheater to preheat the calcium chloride solution needing to be preheated. Therefore, the calcium chloride solution is preheated through the concentrated solution preheater, the condensate water preheater, the steam preheater, the evaporator and the separator, and the steam consumption is reduced, so that the energy consumption is reduced, and the energy waste is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of calcium chloride solution concentration, in particular to a calcium chloride solution concentration production method and device. Background Art

[0002] In the integrated removal process of low-temperature flue gas pollutants, calcium chloride solution is generally used to directly exchange heat with the flue gas in the spray section of the sub-zero temperature zone of the spray tower. However, as the operation time increases, the calcium chloride solution will be diluted by the water in the flue gas, which will increase the freezing point of the calcium chloride solution. Based on this, it is necessary to supplement or replace the initial concentration of calcium chloride solution.

[0003] In the prior art, the diluted calcium chloride solution can be concentrated to avoid the freezing point of the calcium chloride solution rising after long-term use. The diluted calcium chloride solution can be directly heated to form water vapor in the calcium chloride solution and discharge it, thereby achieving the concentration of the calcium chloride solution. However, the method of using the heated solution to concentrate not only consumes a large amount of energy such as electric energy, but also causes a large amount of energy waste in the concentration process. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the present invention proposes a calcium chloride solution concentration production method, which can preheat the calcium chloride solution through a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator, reduce steam consumption, thereby reducing energy consumption and avoiding energy waste.

[0006] Another object of the present invention is to provide a calcium chloride solution concentration production device.

[0007] To achieve the above object, the present invention provides a method for concentrating a calcium chloride solution, which is applied to an MVR evaporation concentration system. The MVR evaporation concentration system includes a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator. The method includes:

[0008] After the calcium chloride solution is preheated by the concentrate preheater, the condensate preheater and the steam preheater respectively, the preheated calcium chloride solution enters the evaporator;

[0009] The raw steam enters the evaporator to perform heat exchange on the preheated calcium chloride solution, and the heat-exchanged calcium chloride solution enters the separator;

[0010] The heat-exchanged calcium chloride solution is subjected to gas-liquid separation in the separator until the concentration of the calcium chloride solution reaches the target concentration, and the generated heat is input into the concentrated liquid preheater to preheat the calcium chloride solution that needs to be preheated.

[0011] The calcium chloride solution concentration production method of the embodiment of the present invention may also have the following additional technical features:

[0012] In one embodiment of the present invention, the MVR evaporation concentration system further includes a heater; the method further includes:

[0013] The heater opens the steam switch valve of the evaporator, allowing the raw steam to enter the evaporator to preheat the evaporator;

[0014] When the evaporator is preheated to a first preset temperature, the heater closes the steam switching valve and switches to an automatic control mode.

[0015] In one embodiment of the present invention, the preheating of the calcium chloride solution by the concentrate preheater, the condensate preheater and the steam preheater respectively comprises preheating the calcium chloride solution by the steam preheater; the preheating of the calcium chloride solution by the steam preheater comprises:

[0016] In the automatic control mode, after the raw steam enters the steam preheater, determine whether the feed liquid in the pipe is flowing;

[0017] If the liquid in the tube flows, the opening size of the steam regulating valve is controlled based on the temperature of the calcium chloride solution in the steam preheater to control the temperature of the calcium chloride solution at a second preset temperature when it enters the evaporator.

[0018] In one embodiment of the present invention, the MVR evaporation concentration system further includes a secondary separator and a compressor, and the method further includes:

[0019] The secondary steam generated by the separator enters the compressor after being subjected to secondary foam capture by the secondary separator;

[0020] The compressor uses the secondary steam to enter the evaporator as a heat source to heat and concentrate the calcium chloride solution in the evaporator.

[0021] In one embodiment of the present invention, the MVR evaporation concentration system further includes a condensate tank and a condensate pump, and the method further includes:

[0022] After the secondary steam enters the evaporator, it is condensed into high-temperature water;

[0023] The high-temperature water enters the condensate tank, is pumped into the condensate preheater through the condensate pump, exchanges heat with the calcium chloride solution, and is sent to the production device for reuse.

[0024] In one embodiment of the present invention, the method further comprises:

[0025] The discharge liquid is discharged into the solution pool to reduce the temperature of the concentrated liquid to avoid excessively high reuse temperature.

[0026] To achieve the above object, the present invention provides a calcium chloride solution concentration production device on the other hand, which is applied to an MVR evaporation concentration system. The MVR evaporation concentration system includes a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator. The device includes:

[0027] A preheating module, used for preheating the calcium chloride solution through the concentrated liquid preheater, the condensed water preheater and the steam preheater respectively, and then allowing the preheated calcium chloride solution to enter the evaporator;

[0028] A heat exchange module, used for generating steam to enter the evaporator to exchange heat with the preheated calcium chloride solution, and the heat-exchanged calcium chloride solution enters the separator;

[0029] The separation module is used for performing gas-liquid separation of the calcium chloride solution after heat exchange in the separator until the concentration of the calcium chloride solution reaches the target concentration, and inputting the generated heat into the concentrated liquid preheater to preheat the calcium chloride solution that needs to be preheated.

[0030] Another object of the present invention is to provide an electronic device, comprising:

[0031] at least one processor; and

[0032] a memory communicatively connected to the at least one processor; wherein,

[0033] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of the methods described in the above aspect.

[0034] Another object of the present invention is to provide a computer storage medium, wherein the computer storage medium stores computer executable instructions; after the computer executable instructions are executed by a processor, the computer executes any one of the methods described in the above aspect.

[0035] The calcium chloride solution concentration production method and device of the embodiment of the present invention can preheat the calcium chloride solution through a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator, thereby reducing steam consumption, thereby reducing energy consumption and avoiding energy waste.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0038] Figure 1 is a flow chart of a method for concentrating and producing a calcium chloride solution according to an embodiment of the present invention;

[0039] Figure 2 1 is a structural diagram of a calcium chloride solution concentration production device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] The following describes the calcium chloride solution concentration production method and device proposed according to the embodiments of the present invention with reference to the accompanying drawings.

[0043] Figure 1 It is a flow chart of the method for concentrating and producing calcium chloride solution according to an embodiment of the present invention.

[0044] like Figure 1 As shown, the method includes:

[0045] S1, preheating the calcium chloride solution through a concentrate preheater, a condensate preheater and a steam preheater respectively, and then passing the preheated calcium chloride solution into an evaporator;

[0046] In one embodiment of the present invention, the above-mentioned calcium chloride solution concentration production method is applied to an MVR evaporation concentration system, which may include a concentrate preheater, a condensate preheater, a steam preheater, an evaporator, a separator, a heater, a secondary separator, a compressor, a condensate tank and a condensate pump.

[0047] In one embodiment of the present invention, the initial concentration of the calcium chloride solution can be 20%, the temperature is about -8°C, the pH is 1.5-2.0, and the feed rate is 9t / h.

[0048] In one embodiment of the present invention, after obtaining the calcium chloride solution to be concentrated, the calcium chloride solution can be sequentially passed through a concentrate preheater, a condensate preheater and a steam preheater to preheat the calcium chloride solution, and the preheated calcium chloride solution is introduced into an evaporator.

[0049] And, in one embodiment of the present invention, in response to the initial startup of the MVR evaporation concentration system, the method may further include: the heater opens the steam switch valve of the evaporator, allows raw steam to enter the evaporator to preheat the evaporator, and when the evaporator is preheated to a first preset temperature, the heater closes the steam switch valve and switches to the automatic control mode. The first preset temperature may be set as needed, for example, 90°C.

[0050] Further, in one embodiment of the present invention, in the above-mentioned automatic control mode, the method for preheating the calcium chloride solution by the steam preheater may include: in the automatic control mode, after the raw steam enters the steam preheater, determining whether the liquid in the tube is flowing; if the liquid in the tube is flowing, controlling the opening size of the steam regulating valve based on the temperature of the calcium chloride solution in the steam preheater, so as to control the temperature of the calcium chloride solution when entering the evaporator at a second preset temperature, thereby ensuring the thermal balance of the entire system. Wherein, the above-mentioned second preset temperature can be set as needed, for example, 95°C.

[0051] S2, raw steam enters the evaporator to exchange heat with the preheated calcium chloride solution, and the heat-exchanged calcium chloride solution enters the separator;

[0052] S3, the calcium chloride solution after heat exchange is subjected to gas-liquid separation in a separator until the concentration of the calcium chloride solution reaches a target concentration, and the generated heat is input into a concentrated liquid preheater to preheat the calcium chloride solution that needs to be preheated.

[0053] In one embodiment of the present invention, the target concentration may be 30%.

[0054] In one embodiment of the present invention, the method may further include: the secondary steam generated by the separator enters the compressor after secondary foam capture through the secondary separator, and the compressor uses the secondary steam to enter the evaporator as a heat source to heat and concentrate the calcium chloride solution in the evaporator.

[0055] And, in one embodiment of the present invention, the above method may further include: after the secondary steam enters the evaporator, it is condensed into high-temperature water, and the high-temperature water enters the condensate tank, and is pumped into the condensate preheater through the condensate pump to exchange heat with the calcium chloride solution and sent to the production device for reuse. The temperature of the high-temperature water may be 110°C.

[0056] Furthermore, in one embodiment of the present invention, the method may further include: discharging the discharge liquid into a solution pool to reduce the temperature of the concentrated liquid to avoid excessively high reuse temperature.

[0057] According to the calcium chloride solution concentration production method of the embodiment of the present invention, the method can preheat the calcium chloride solution through a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator, reduce the steam consumption, thereby reducing energy consumption and avoiding energy waste.

[0058] In order to implement the above embodiment, Figure 2 As shown, this embodiment also provides a calcium chloride solution concentration production device 10, which is applied to an MVR evaporation concentration system. The MVR evaporation concentration system includes a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator. The device includes:

[0059] A preheating module 201 is used to preheat the calcium chloride solution through a concentrate preheater, a condensate preheater and a steam preheater, respectively, and then the preheated calcium chloride solution enters the evaporator;

[0060] Heat exchange module 202, used for generating steam to enter the evaporator to exchange heat with the preheated calcium chloride solution, and the heat-exchanged calcium chloride solution enters the separator;

[0061] The separation module 203 is used to separate the gas and liquid of the calcium chloride solution after heat exchange in a separator until the concentration of the calcium chloride solution reaches the target concentration, and input the generated heat into the concentrated liquid preheater to preheat the calcium chloride solution that needs to be preheated.

[0062] In one embodiment of the present invention, the above device is further used for:

[0063] The heater opens the steam switch valve of the evaporator, allowing raw steam to enter the evaporator to preheat the evaporator;

[0064] When the evaporator is preheated to the first preset temperature, the heater closes the steam switching valve and switches to the automatic control mode.

[0065] Furthermore, in one embodiment of the present invention, the preheating module 201 is specifically used for:

[0066] In the automatic control mode, after the raw steam enters the steam preheater, determine whether the liquid in the pipe is flowing;

[0067] If the liquid in the tube flows, the opening size of the steam regulating valve is controlled based on the temperature of the calcium chloride solution in the steam preheater to control the temperature of the calcium chloride solution at the second preset temperature when it enters the evaporator.

[0068] Furthermore, in one embodiment of the present invention, the above device is also used for:

[0069] The secondary steam generated by the separator enters the compressor after being subjected to secondary foam capture by the secondary separator;

[0070] The compressor sends the secondary steam into the evaporator as a heat source to heat and concentrate the calcium chloride solution in the evaporator.

[0071] Furthermore, in one embodiment of the present invention, the above device is also used for:

[0072] After the secondary steam enters the evaporator, it condenses into high-temperature water;

[0073] The high-temperature water enters the condensate tank, is pumped into the condensate preheater through the condensate pump, exchanges heat with the calcium chloride solution, and is sent to the production unit for reuse.

[0074] Furthermore, in one embodiment of the present invention, the above device is also used for:

[0075] The discharge liquid is discharged into the solution pool to reduce the temperature of the concentrated liquid to avoid excessively high reuse temperature.

[0076] According to the calcium chloride solution concentration production device of the embodiment of the present invention, the device can preheat the calcium chloride solution through a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator, thereby reducing steam consumption, thereby reducing energy consumption and avoiding energy waste.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A method for producing a concentrated calcium chloride solution, characterized in that: Applied to an MVR evaporation and concentration system, the MVR evaporation and concentration system includes a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator, and the method includes: After the calcium chloride solution is preheated by the concentrate preheater, the condensate preheater and the steam preheater respectively, the preheated calcium chloride solution enters the evaporator; The raw steam enters the evaporator to perform heat exchange on the preheated calcium chloride solution, and the heat-exchanged calcium chloride solution enters the separator; The heat-exchanged calcium chloride solution is subjected to gas-liquid separation in the separator until the concentration of the calcium chloride solution reaches the target concentration, and the generated heat is input into the concentrated liquid preheater to preheat the calcium chloride solution that needs to be preheated.

2. The method according to claim 1, characterized in that The MVR evaporation concentration system further includes a heater; the method further includes: In response to the initial startup of the MVR evaporation concentration system, the heater opens the steam switch valve of the evaporator to allow the raw steam to enter the evaporator to preheat the evaporator; When the evaporator is preheated to a first preset temperature, the heater closes the steam switching valve and switches to an automatic control mode.

3. The method according to claim 2, characterized in that The preheating of the calcium chloride solution by the concentrated liquid preheater, the condensed water preheater and the steam preheater respectively comprises preheating the calcium chloride solution by the steam preheater; the preheating of the calcium chloride solution by the steam preheater comprises: In the automatic control mode, after the raw steam enters the steam preheater, determine whether the feed liquid in the pipe is flowing; If the liquid in the tube flows, the opening size of the steam regulating valve is controlled based on the temperature of the calcium chloride solution in the steam preheater to control the temperature of the calcium chloride solution at a second preset temperature when it enters the evaporator.

4. The method according to claim 1, characterized in that: The MVR evaporation and concentration system further includes a secondary separator and a compressor, and the method further includes: The secondary steam generated by the separator enters the compressor after being subjected to secondary foam capture by the secondary separator; The compressor uses the secondary steam to enter the evaporator as a heat source to heat and concentrate the calcium chloride solution in the evaporator.

5. The method according to claim 4, characterized in that The MVR evaporation and concentration system further includes a condensate tank and a condensate pump, and the method further includes: After the secondary steam enters the evaporator, it is condensed into high-temperature water; The high-temperature water enters the condensate tank, is pumped into the condensate preheater through the condensate pump, exchanges heat with the calcium chloride solution, and is sent to the production device for reuse.

6. The method according to claim 1, characterized in that The method further comprises: The discharge liquid is discharged into the solution pool to reduce the temperature of the concentrated liquid to avoid excessively high reuse temperature.

7. A calcium chloride solution concentration production device, characterized in that, Applied to MVR evaporation and concentration system, the MVR evaporation and concentration system includes a concentrate preheater, a condensate preheater, a steam preheater, an evaporator and a separator, and the device includes: A preheating module, used for preheating the calcium chloride solution through the concentrated liquid preheater, the condensed water preheater and the steam preheater respectively, and then allowing the preheated calcium chloride solution to enter the evaporator; A heat exchange module, used for generating steam to enter the evaporator to exchange heat with the preheated calcium chloride solution, and the heat-exchanged calcium chloride solution enters the separator; The separation module is used for performing gas-liquid separation of the calcium chloride solution after heat exchange in the separator until the concentration of the calcium chloride solution reaches the target concentration, and inputting the generated heat into the concentrated liquid preheater to preheat the calcium chloride solution that needs to be preheated.

8. The device according to claim 7, characterized in that The MVR evaporation concentration system also includes a heater, and the device is also used for: The heater opens the steam switch valve of the evaporator, allowing the raw steam to enter the evaporator to preheat the evaporator; When the evaporator is preheated to a first preset temperature, the heater closes the steam switching valve and switches to an automatic control mode.

9. An electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 5.

10. A computer storage medium, wherein: The computer storage medium stores computer executable instructions; after the computer executable instructions are executed by the processor, the method according to any one of claims 1 to 5 can be implemented.

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