A device for improving the preparation efficiency of chemical water by using circulating water waste heat

Abstract

The utility model discloses a device of utilizing circulating water waste heat to improve water preparation efficiency, including machine force ventilation cooling tower device, condenser and plate heat exchanger, the machine force ventilation cooling tower in machine force ventilation cooling tower device, cooling tower pool all are connected on the condenser through the pipeline of installation, the water outlet pipeline of condenser is connected on the plate heat exchanger through the condenser circulating water outlet pipeline of installation, the utility model discloses for utilizing power plant circulating water waste heat to heat the raw water of chemical water treatment system, namely, recovers the waste heat, and the energy consumption of water system has been reduced, and the overall water production efficiency has been improved, and the energy consumption needed for circulating water cooling can be reduced simultaneously.

Description

Technical Field

[0001] This utility model relates to a technical measure to improve the efficiency of water preparation by utilizing the waste heat of circulating water; specifically, it relates to a device for improving the efficiency of water preparation by utilizing the waste heat of circulating water. Background Technology

[0002] The power plant's chemical water treatment system filters, softens, deoxygenates, and removes ions from the incoming water to ensure it meets boiler feedwater requirements. Currently, boiler feedwater treatment often employs ultrafiltration + two-stage reverse osmosis (RO) + EDI. In the RO and EDI stages, lower water temperatures in winter significantly impact the effluent from the RO membrane and the EDI electro-desalination process, reducing RO permeate yield and EDI ion exchange rate. The high-temperature water outlet temperature from the steam turbine condenser is typically 33-43°C; directly returning it to the cooling tower not only wastes heat energy but also consumes cooling tower energy. Although the circulating water temperature is lower in winter, the large volume of circulating water means the residual heat can still meet the heating needs of the raw water for boiler treatment. Summary of the Invention

[0003] Purpose of the utility model: The purpose of this utility model is to provide a device that utilizes the waste heat of circulating water to improve the efficiency of water preparation by reducing heat energy waste, reducing cooling tower energy consumption, recovering waste heat and reducing the energy consumption of the water treatment system, and improving the overall water production efficiency.

[0004] Technical solution: The device for improving water preparation efficiency by utilizing waste heat from circulating water according to this utility model includes a mechanically ventilated cooling tower device, a condenser, and a plate heat exchanger; The mechanical ventilation cooling tower and cooling tower water tank in the mechanical ventilation cooling tower device are both connected to the condenser through installed pipes; The condenser's outlet water pipe is connected to the plate heat exchanger via an installed condenser circulating water outlet water pipe.

[0005] Furthermore, the outlet of the plate heat exchanger is connected to the cooling tower water tank via an installed pipe.

[0006] Furthermore, a circulating water pump is installed on the pipe connecting the cooling tower water tank to the condenser.

[0007] Furthermore, the pressure of the condenser's outlet water pipe is 0.10~0.15MPa.

[0008] Furthermore, a regulating valve is installed on the condenser circulating water outlet pipe of the condenser connected to the plate heat exchanger.

[0009] Furthermore, a filter is installed on the plate heat exchanger to prevent impurities in the circulating water from clogging the heat exchanger.

[0010] Furthermore, the plate heat exchanger is made of 304 stainless steel.

[0011] Beneficial Effects: Compared with existing technologies, this utility model has the following significant advantages: 1. It fully utilizes the waste heat of circulating water, recovers the waste heat of circulating water, and heats the raw water for treatment by plate heat exchangers, raising the temperature of the raw water by 10-15℃; at the same time, it utilizes the residual pressure at the outlet of the condenser's circulating water to still send the circulating water to the cooling tower's collection pool. The entire utilization process requires no power or energy consumption; 2. In winter, the raw water temperature can be increased from 5-10℃ to 15-25℃, at which time the reverse osmosis and EDI electro-desalination water production rates and treatment effects in the water treatment system will be significantly improved; 3. The reverse osmosis membrane flux increases with the increase of water temperature (for every 1℃ increase, the water production increases by about 3%), reducing operating pressure and energy consumption; 4. It reduces the regeneration frequency of ion exchange resins (high temperature can accelerate the reaction rate); 5. It reduces the problem of decreased treatment efficiency caused by low raw water temperature in winter. Attached Figure Description

[0012] Figure 1 This is a diagram of the waste heat recovery system for circulating water according to this utility model; In the diagram, 1 is a mechanical ventilation cooling tower, 2 is a circulating water pump, 3 is a condenser, and 4 is a plate heat exchanger. Detailed Implementation

[0013] The specific technical solution of this utility model will be further described in detail below with reference to specific examples.

[0014] As shown in the figure, the device for improving the efficiency of water preparation by utilizing the waste heat of circulating water according to this utility model includes a mechanical ventilation cooling tower device 1, a condenser 3 and a plate heat exchanger 4. The mechanical ventilation cooling tower and cooling tower water tank in the mechanical ventilation cooling tower device 1 are both connected to the condenser 3 through installed pipes; The outlet water pipe of the condenser 3 is connected to the plate heat exchanger 4 through the installed condenser circulating water outlet water pipe. Specifically, by adding a branch line to the outlet pipe of the traditional condenser 3, the high-temperature circulating water is led to the heat medium inlet end of the plate heat exchanger 4, and the heat medium outlet of the heat exchanger is connected to the cooling tower water pool using residual pressure. At the same time, it is necessary to avoid affecting the operation of the main circulating water pipeline.

[0015] The outlet of the plate heat exchanger 4 is connected to the cooling tower water tank 1 via an installed pipe.

[0016] A circulating water pump 2 is installed on the pipe connecting the cooling tower water tank to the condenser 3.

[0017] The pressure of the outlet water pipe of the condenser 3 is 0.10~0.15MPa, which can meet the inlet water pressure requirements of the plate heat exchanger 4.

[0018] A regulating valve is installed on the condenser circulating water outlet pipe of the condenser 3 connected to the plate heat exchanger 4; a regulating valve is installed on the newly added branch outlet pipe of the condenser, and the opening of the regulating valve is controlled according to the outlet temperature of the heated water of the heat exchanger, which can be controlled manually or automatically.

[0019] A filter is installed on the plate heat exchanger 4 to prevent impurities in the circulating water from clogging the heat exchanger.

[0020] The plate heat exchanger 4 is made of 304 stainless steel. The heat exchanger selected is plate heat exchanger 4, which has high heat transfer efficiency, compact structure, and is suitable for heat exchange with small temperature difference (temperature difference between circulating water and raw water is 10-20℃).

[0021] In this invention, the circulating water waste heat is as follows: During the operation of the steam turbine, the circulating water exchanges heat with the steam discharged from the turbine's end, causing the steam to condense into condensate, thereby maintaining the pressure difference between the turbine's inlet and outlet steam and ensuring that the steam effectively expands and performs work within the turbine. After completing the cooling process, the circulating water temperature rises, carrying a large amount of low-temperature heat energy that is difficult to utilize directly, which is usually released through a cooling tower (mechanical ventilation cooling tower). This portion of waste heat carried by the circulating water and not effectively utilized during normal operation is called circulating water waste heat. Recovering and utilizing this waste heat is of great significance for improving the overall energy efficiency of power plants and realizing the cascade utilization of energy. Condenser 3: A heat exchanger that condenses turbine exhaust steam into water; Chemical water systems refer to water treatment using chemical methods to meet the requirements of production and domestic water use; they mainly include flocculation, sedimentation, filtration, softening, deoxygenation, and desalination.

[0022] The key points of this utility model are: (1) Set a branch pipe at a suitable position in the condenser circulating water outlet pipe so as not to affect the operation of the circulating water. At the same time, the heat exchanger should be set as close as possible to the condenser 3; (2) The area of ​​the heat exchanger must fully consider the influence of the temperature fluctuation of the circulating water in winter, and the heat exchanger tube loss should ensure that the pressure can flow back to the cooling tower water collection pool by gravity.

[0023] This invention utilizes the waste heat from power plant circulating water to heat the raw water in a chemical water treatment system. This not only recovers the waste heat but also reduces the energy consumption of the water treatment system, improves the overall water production efficiency, and reduces the energy consumption required for circulating water cooling.

Claims

1. A device for improving water preparation efficiency by utilizing waste heat from circulating water, characterized in that, This includes mechanically ventilated cooling towers, condensers, and plate heat exchangers. The mechanical ventilation cooling tower and cooling tower water tank in the mechanical ventilation cooling tower device are both connected to the condenser through installed pipes; The condenser's outlet water pipe is connected to the plate heat exchanger via an installed condenser circulating water outlet water pipe.

2. The apparatus for improving water treatment efficiency using waste heat from circulating water according to claim 1, characterized in that, The outlet of the plate heat exchanger is connected to the cooling tower water tank via an installed pipe.

3. The apparatus for improving water treatment efficiency using waste heat from circulating water according to claim 1, characterized in that, A circulating water pump is installed on the pipeline connecting the cooling tower water tank to the condenser.

4. The apparatus for improving water treatment efficiency using waste heat from circulating water according to claim 1, characterized in that, The pressure of the condenser's outlet water pipe is 0.10~0.15MPa.

5. The apparatus for improving water treatment efficiency using waste heat from circulating water according to claim 1, characterized in that, A regulating valve is installed on the condenser circulating water outlet pipe of the condenser connected to the plate heat exchanger.

6. The apparatus for improving water treatment efficiency by utilizing waste heat from circulating water according to claim 1, characterized in that, A filter is installed on the plate heat exchanger to prevent impurities in the circulating water from clogging the heat exchanger.

7. The apparatus for improving water treatment efficiency using waste heat from circulating water according to claim 1, characterized in that, The plate heat exchanger is made of 304 stainless steel.

Images