A device for recycling high-temperature condensate to prepare desalinated water and achieve efficient utilization of water resources.

Abstract

This utility model discloses a device for efficiently utilizing water resources by recovering high-temperature condensate to prepare demineralized water. It includes a high-temperature condensate output unit, a heat exchange and cooling unit, a demineralized water unit, and a demineralized water supply unit. The heat exchange and cooling unit includes a primary heat exchanger connected to the high-temperature condensate output unit via a pipeline, a secondary heat exchanger connected to the outlet of the primary heat exchanger via a pipeline, and a tertiary heat exchanger connected to the outlet of the secondary heat exchanger via a pipeline. The outlet of the tertiary heat exchanger is connected to the demineralized water unit via a pipeline, and the outlet of the demineralized water unit is connected to the demineralized water supply unit via a pipeline. In this application, after multi-stage efficient heat recovery treatment of the high-temperature condensate, the temperature of the high-temperature condensate is reduced to the design temperature range of 35-45℃ for the demineralized water unit. The cooled condensate is then transported to the demineralized water unit to prepare demineralized water, thus replenishing the demineralized water supply unit.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature condensate cooling technology, specifically to a device for recycling high-temperature condensate to prepare desalinated water and achieve efficient utilization of water resources. Background Technology

[0002] In the existing industrial production process, the phosphoric acid concentration unit continuously produces high-temperature condensate, with a stable temperature of around 107℃ and an average annual flow rate of 180 t / h. Currently, the concentrated high-temperature condensate first passes through the deaerator in the boiler of the sulfuric acid unit. A heat exchanger on the feedwater pipe heats the concentrated high-temperature condensate, lowering its temperature to 80-90℃. The condensate is then directly fed into a 300-ton condensate tank, from which it is pumped to the concentration unit for cooling. A portion of the condensate enters the industrial water pool in the industrial park, and a small portion enters a 750-ton low-temperature demineralized water preparation unit for the preparation of demineralized water.

[0003] In existing technologies, a 750t demineralized water unit can only handle condensate at temperatures of 35-45℃. Due to the excessively high temperature, only a small amount of high-temperature condensate can be utilized by the unit, resulting in significant heat loss. Concentrated high-temperature condensate cannot be directly treated and must be neutralized and temperature-adjusted with the raw water, with a usage rate of approximately 30t / h. The industrial water tank has a capacity of 50t / h, and the concentration unit's cooling and circulation rate is 100t / h. This situation not only wastes a large amount of high-quality condensate resources, but also raises the temperature of the condensate in the industrial water tank, affecting other production equipment that relies on the industrial water tank's condensate for cooling. This leads to low exchange efficiency and poor cooling effect, and in the long run, can cause related equipment malfunctions and leaks, posing a significant challenge to production systems that use industrial water tank condensate. Summary of the Invention

[0004] The purpose of this invention is to provide a device for efficiently utilizing water resources by recovering high-temperature condensate to prepare desalinated water, addressing the aforementioned technical problems.

[0005] The technical solution of this utility model: A device for recycling high-temperature condensate to prepare demineralized water for efficient water resource utilization includes a high-temperature condensate output unit, a heat exchange and cooling unit, a demineralized water unit, and a demineralized water supply unit. The heat exchange and cooling unit includes a primary heat exchanger connected to the high-temperature condensate output unit via a pipeline, a secondary heat exchanger connected to the outlet of the primary heat exchanger via a pipeline, and a tertiary heat exchanger connected to the outlet of the secondary heat exchanger via a pipeline. The outlet of the tertiary heat exchanger is connected to the demineralized water unit via a pipeline, and the outlet of the demineralized water unit is connected to the demineralized water supply unit via a pipeline.

[0006] The high-temperature condensate output unit includes a condensate storage tank connected to the inlet of the primary heat exchanger, a concentrated condensate tank whose inlet is connected to the condensate storage tank via a pipeline, and a heat exchanger connected to the outlet of the concentrated condensate tank via a pipeline. The heat exchanger is connected to the inlet of the condensate storage tank.

[0007] A concentrated water pump is installed between the primary heat exchanger and the condensate storage tank; a condensate pump is installed between the concentrated condensate tank and the condensate storage tank; and a condensate pump is installed between the concentrated condensate tank and the heat exchanger.

[0008] The demineralized water supply unit includes several boilers that are connected to the outlet of the demineralized water unit via pipelines.

[0009] The primary heat exchanger is a liquid ammonia evaporator that uses a slurry method to perform primary heat exchange on high-temperature condensate. The secondary heat exchanger is a liquid ammonia evaporator that uses a conventional method to perform secondary deep heat exchange on high-temperature condensate. The tertiary heat exchanger is a liquid ammonia evaporator that performs tertiary heat exchange on high-temperature condensate.

[0010] The desalination unit includes a pretreatment module, an ion exchange module, and a desalination module. The pretreatment module is connected to the three-stage heat exchanger via a pipeline. The inlet of the ion exchange module is connected to the outlet of the pretreatment module. The outlet of the ion exchange module is connected to the inlet of the desalination system. The outlet of the desalination module is connected to the inlet of the desalination replenishment unit.

[0011] The pretreatment module includes a valveless filter, a clean water tank, a clean water pump, and a high-efficiency filter connected in sequence by pipes. The inlet of the valveless filter is connected to the outlet of the three-stage heat exchanger, and the outlet of the high-efficiency filter is connected to the inlet of the ion exchange module.

[0012] The ion exchange module includes a cation exchanger, a carbon dioxide remover, an intermediate water tank, an intermediate water pump, an anion exchanger, and a mixed ion exchanger connected in sequence. The inlet of the cation exchanger is connected to the outlet of the pretreatment module, and the outlet of the mixed ion exchanger is connected to the inlet of the desalination module.

[0013] The desalination module includes a desalination tank whose inlet end is connected to the outlet end of the ion exchange module, and a desalination pump whose inlet end is connected to the outlet end of the desalination tank. The outlet end of the desalination pump is connected to the inlet end of the desalination water supply unit.

[0014] The beneficial effects of this utility model are: In this application, the high-temperature condensate undergoes multi-stage, high-efficiency heat recovery treatment via primary, secondary, and tertiary heat exchangers, reducing its temperature to the design temperature range of 35-45℃ for the demineralized water unit. The cooled condensate is then transported to the demineralized water unit to prepare demineralized water, thus supplying demineralized water to the demineralized water replenishment unit. This application achieves efficient water resource utilization through recycling and reuse, effectively reducing production costs, alleviating pressure on wastewater treatment plants, and lowering overall costs.

[0015] This application's technical solution achieves multiple benefits by constructing a closed-loop system of "heat recovery - process cooling - heat recycling," specifically as follows: Technically, it adopts mature liquid ammonia evaporator heat exchange equipment recovery technology, with strong equipment compatibility and high system operational stability. Environmentally, it effectively reduces thermal pollution caused by direct discharge of high-temperature water, lowers industrial water temperature, and contributes to a reduction in carbon emission intensity. Economically, condensate recycling saves on demineralized water preparation costs, reducing production costs. Socially, it significantly enhances energy conservation and emission reduction achievements. The implementation risk of this technical solution is controllable, it forms a high degree of synergy with existing liquid ammonia evaporation system heat exchangers, has low equipment modification costs, and combines technical feasibility with economic rationality. It is of great significance for achieving cost reduction and efficiency improvement, green transformation, and enhancing core competitiveness. Attached Figure Description

[0016] Fig. 1 This is a module diagram of this utility model; Fig. 2 This is a module diagram of the desalination unit of this utility model.

[0017] Attached reference numerals: 1-High-temperature condensate output unit, 2-Heat exchange and cooling unit, 3-Demineralized water unit, 4-Demineralized water supply unit, 5-First-stage heat exchanger, 6-Second-stage heat exchanger, 7-Third-stage heat exchanger, 8-Condensate storage tank, 9-Concentrated condensate tank, 10-Heat exchanger, 11-Concentrated water pump, 12-Condensate pump one, 13-Condensate pump two, 14-Demineralized water pump, 15-Valveless filter, 16-Clear water tank, 17-Clear water pump, 18-High-efficiency filter, 19-Cation exchanger, 20-Carbon dioxide remover, 21-Intermediate water tank, 22-Intermediate water pump, 23-Anion exchanger, 24-Mixed ion exchanger, 25-Demineralized water tank. Detailed Implementation

[0018] Example 1: Reference Figs. 1-2As shown, a device for efficiently utilizing water resources by recovering high-temperature condensate to prepare demineralized water includes a high-temperature condensate output unit 1, a heat exchange and cooling unit 2, a demineralized water unit 3, and a demineralized water supply unit 4. The heat exchange and cooling unit 2 includes a primary heat exchanger 5 connected to the high-temperature condensate output unit 1 via a pipeline, a secondary heat exchanger 6 connected to the outlet of the primary heat exchanger 5 via a pipeline, and a tertiary heat exchanger 7 connected to the outlet of the secondary heat exchanger 6 via a pipeline. The outlet of the tertiary heat exchanger 7 is connected to the demineralized water unit 3 via a pipeline, and the outlet of the demineralized water unit 3 is connected to the demineralized water supply unit 4 via a pipeline. The high-temperature condensate output unit 1 is a phosphoric acid concentration device that can continuously produce high-temperature condensate with a stable temperature of approximately 107°C.

[0019] In this application, control valves are installed on the pipes between each component for ease of maintenance.

[0020] The high-temperature condensate output unit 1 includes a condensate storage tank 8 connected to the inlet of the primary heat exchanger 5, a concentrated condensate tank 9 whose inlet is connected to the condensate storage tank 8 via a pipe, and a heat exchanger 10 connected to the outlet of the concentrated condensate tank 9 via a pipe. The heat exchanger 10 is connected to the inlet of the condensate storage tank 8.

[0021] A concentrate pump 11 is installed between the primary heat exchanger 5 and the condensate storage tank 8; a condensate pump 12 is installed between the concentrated condensate tank 9 and the condensate storage tank 8; and a condensate pump 13 is installed between the concentrated condensate tank 9 and the heat exchanger 10. This arrangement is mainly to facilitate the extraction and unblocking of high-temperature condensate, ensuring normal pipeline operation.

[0022] The demineralized water supply unit 4 includes several boilers connected to the outlet of the demineralized water unit 3 via pipelines. In practical applications, six boilers are preferred, mainly for supplying demineralized water.

[0023] The primary heat exchanger 5 is a liquid ammonia evaporator that uses a slurry method for primary heat exchange of high-temperature condensate. The secondary heat exchanger 6 is a liquid ammonia evaporator that uses a conventional method for secondary deep heat exchange of high-temperature condensate. The tertiary heat exchanger 7 is a liquid ammonia evaporator that uses a tertiary heat exchange of high-temperature condensate. This application utilizes a slurry-based liquid ammonia evaporator for primary heat exchange of 107°C high-temperature condensate, initially recovering heat energy. Subsequently, a conventional liquid ammonia evaporator achieves secondary deep heat exchange. Finally, the condensate is introduced into a large-capacity liquid ammonia evaporator for tertiary heat exchange. After multiple stages of efficient heat recovery, the condensate temperature is reduced to the design temperature range of 35-45°C for the 750t demineralized water unit.

[0024] The desalination unit 3 includes a pretreatment module, an ion exchange module, and a desalination module. The pretreatment module is connected to the three-stage heat exchanger 7 via a pipeline. The inlet of the ion exchange module is connected to the outlet of the pretreatment module. The outlet of the ion exchange module is connected to the inlet of the desalination system. The outlet of the desalination module is connected to the inlet of the desalination replenishment unit 4.

[0025] The pretreatment module includes a valveless filter 15, a clean water tank 16, a clean water pump 17, and a high-efficiency filter 18, which are connected sequentially by pipelines. The inlet of the valveless filter 15 is connected to the outlet of the three-stage heat exchanger 7, and the outlet of the high-efficiency filter 18 is connected to the inlet of the ion exchange module. The pretreatment module is mainly used to remove suspended solids, colloids, organic matter, and residual chlorine from the high-temperature condensate.

[0026] The ion exchange module includes a cation exchanger 19, a carbon dioxide remover 20, an intermediate water tank 21, an intermediate water pump 22, an anion exchanger 23, and a mixed ion exchanger 24 connected in sequence. The inlet of the cation exchanger 19 is connected to the outlet of the pretreatment module, and the outlet of the mixed ion exchanger 24 is connected to the inlet of the desalination module.

[0027] The desalination module includes a desalination tank 25 whose inlet end is connected to the outlet end of the ion exchange module, and a desalination pump 14 whose inlet end is connected to the outlet end of the desalination tank 25. The outlet end of the desalination pump 14 is connected to the inlet end of the desalination water supply unit 4.

[0028] The desalination unit 3 is mainly used to prepare desalinated water; the pretreatment module is mainly used to remove suspended solids, colloids, organic matter and residual chlorine from high-temperature condensate to protect downstream equipment; the ion exchange module is mainly used to remove ions from the water to achieve preliminary desalination; and the desalination module is used to further improve water quality to meet high purity requirements.

[0029] In this application, the high-temperature condensate is treated by multi-stage high-efficiency heat recovery through primary heat exchanger 5, secondary heat exchanger 6 and tertiary heat exchanger 7, so that the temperature of the high-temperature condensate is reduced to the design water temperature range of 35-45℃ of the demineralized water unit 3. The cooled condensate is then transported to the demineralized water unit 3 to prepare demineralized water, thereby realizing the demineralized water supply of the demineralized water supply unit 4.

[0030] This application utilizes water resources efficiently through recycling and reuse, effectively reducing production costs, alleviating pressure on wastewater treatment plants, and lowering overall costs.

[0031] This application's technical solution achieves multiple benefits by constructing a closed-loop system of "heat recovery - process cooling - heat recycling," specifically as follows: Technically, it adopts mature liquid ammonia evaporator heat exchange equipment recovery technology, with strong equipment compatibility and high system operational stability. Environmentally, it effectively reduces thermal pollution caused by direct discharge of high-temperature water, lowers industrial water temperature, and contributes to a reduction in carbon emission intensity. Economically, condensate recycling saves on demineralized water preparation costs, reducing production costs. Socially, it significantly enhances energy conservation and emission reduction achievements. The implementation risk of this technical solution is controllable, it forms a high degree of synergy with existing liquid ammonia evaporation system heat exchangers, has low equipment modification costs, and combines technical feasibility with economic rationality. It is of great significance for achieving cost reduction and efficiency improvement, green transformation, and enhancing core competitiveness.

Claims

1. A device for recycling high-temperature condensate to prepare desalinated water for efficient water resource utilization, comprising a high-temperature condensate output unit (1), a heat exchange and cooling unit (2), a desalination unit (3), and a desalination water supply unit (4), characterized in that... The heat exchange and cooling unit (2) includes a primary heat exchanger (5) connected to the high-temperature condensate output unit (1) via a pipe, a secondary heat exchanger (6) connected to the outlet of the primary heat exchanger (5) via a pipe, and a tertiary heat exchanger (7) connected to the outlet of the secondary heat exchanger (6) via a pipe. The outlet of the tertiary heat exchanger (7) is connected to the demineralized water unit (3) via a pipe, and the outlet of the demineralized water unit (3) is connected to the demineralized water supply unit (4) via a pipe.

2. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 1, characterized in that: The high-temperature condensate output unit (1) includes a condensate storage tank (8) connected to the inlet of the first-stage heat exchanger (5), a concentrated condensate tank (9) whose inlet is connected to the condensate storage tank (8) via a pipe, and a heat exchanger (10) connected to the outlet of the concentrated condensate tank (9) via a pipe. The heat exchanger (10) is connected to the inlet of the condensate storage tank (8).

3. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 2, characterized in that: A concentrated water pump (11) is provided between the primary heat exchanger (5) and the condensate storage tank (8), a condensate pump (12) is provided between the concentrated condensate tank (9) and the condensate storage tank (8), and a condensate pump (13) is provided between the concentrated condensate tank (9) and the heat exchanger (10).

4. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 1, characterized in that: The demineralized water supply unit (4) includes several boilers that are connected to the outlet of the demineralized water unit (3) via pipelines.

5. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 1, characterized in that: The first-stage heat exchanger (5) is a liquid ammonia evaporator that uses a slurry method to perform first-stage heat exchange on high-temperature condensate. The second-stage heat exchanger (6) is a liquid ammonia evaporator that uses a traditional method to perform second-stage deep heat exchange on high-temperature condensate. The third-stage heat exchanger (7) is a liquid ammonia evaporator that performs third-stage heat exchange on high-temperature condensate.

6. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 1, characterized in that: The desalination unit (3) includes a pretreatment module, an ion exchange module and a desalination module. The pretreatment module is connected to the three-stage heat exchanger (7) through a pipeline. The inlet of the ion exchange module is connected to the outlet of the pretreatment module. The outlet of the ion exchange module is connected to the inlet of the desalination system. The outlet of the desalination module is connected to the inlet of the desalination supply unit (4).

7. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 6, characterized in that: The pretreatment module includes a valveless filter (15), a clean water tank (16), a clean water pump (17), and a high-efficiency filter (18) connected in sequence by pipes. The inlet of the valveless filter (15) is connected to the outlet of the three-stage heat exchanger (7), and the outlet of the high-efficiency filter (18) is connected to the inlet of the ion exchange module.

8. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 6, characterized in that: The ion exchange module includes a cation exchanger (19), a carbon dioxide remover (20), an intermediate water tank (21), an intermediate water pump (22), an anion exchanger (23), and a mixed ion exchanger (24) connected in sequence. The inlet of the cation exchanger (19) is connected to the outlet of the pretreatment module, and the outlet of the mixed ion exchanger (24) is connected to the inlet of the desalination module.

9. The device for recovering high-temperature condensate to prepare desalinated water and achieving efficient utilization of water resources according to claim 6, characterized in that: The desalination module includes a desalination tank (25) whose inlet end is connected to the outlet end of the ion exchange module, and a desalination pump (14) whose inlet end is connected to the outlet end of the desalination tank (25). The outlet end of the desalination pump (14) is connected to the inlet end of the desalination water supply unit (4).

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