TW451054B - Cleaning method and device for heat exchanger - Google Patents

Abstract

This invention provides a cleaning method and device for a heat exchanger. A close-type cleaning liquid reservoir is linked to circulation valve and return valve which are connected to the circulation circuit and return tube via inlet tube and return tube of the heat exchanger to form a closed-type circulation cleaning device. By closing the washing water stop valves and return water stop valve and then opening cleaning valve and air valve, the cleaning liquid in the reservoir is removed. The residual air in the reservoir is removed by adding cleaning liquid into the reservoir, closing the input valve, opening the second water stop valve and then slowly opening the return valve. After closing air valve, fully opening circulation valve, return valve, cleaning water stop valve, the heat exchanger can be washed by activating circulation pump to enable circulation of cleaning liquid within pipeline, heat exchanger and cleaning liquid reservoir. This can achieve effective circulating for cleaning heat exchanger and prevent overflow of cooling water, dilution of cleaning liquid and sudden injection of gases and thus effectively conserve cleaning liquid.

Description

05 4 Five 'invention description (1) [invention description] The present invention is a heat exchanger cleaning method and device, which is mainly provided with a circulating valve on a closed cleaning liquid storage tank. The return valve is respectively connected to the circulating pipe. Circuit and return pipe in the heat exchanger's water inlet pipe and return pipe to form a closed cycle cleaning device 'by closing the cleaning water stop valve, return water stop valve' and then opening the cleaning valve and air valve 'to remove the cleaning liquid Feed the cleaning liquid in the storage tank, and then feed the cleaning liquid into the cleaning liquid storage tank, and close the feeding valve, open the return water stop valve and slowly open the return valve to eliminate the residual air in the cleaning liquid storage tank. Finally close the air Valve and fully open the circulation valve, return valve, cleaning water stop valve 'restart the circulation pump, so that the cleaning liquid circulates between the pipeline, the heat exchanger and the cleaning liquid storage tank' The heat exchanger is cleaned cyclically, and it can prevent the overflow of cooling water, the dilution of cleaning liquid and the lack of gas burst, and effectively save the effect of cleaning liquid. [Background of the Invention] According to the conventional cleaning method and device of the hot parent converter, please refer to FIG. 1, which is mainly connected to an open cleaning liquid storage tank i 〇, connected with a circulation pipeline 20 and a return pipe. Road 30, in the heat exchanger 40, when cleaning the heat exchanger, first close the cleaning water stop valve 2 2 ′, the water inlet pipe 41, the upper water stop valve 43, the return water pipe 42, and the upper water stop valve 44. Then, put a certain amount of cleaning liquid in the open cleaning liquid storage tank i 〇, and finally start the circulation pump 21 to make the cleaning liquid in the circulation pipeline £ 0, the water inlet pipe 41, and the return pipeline 30 The heat exchanger 40, the return water pipe 42, and the open cleaning liquid storage tank 10 are circulated to clean the heat exchanger 40 ', but the disadvantages are as follows:

45105 4_ V. Description of the invention (2) (1) When the internal water pressure of the cooling water inlet pipe 41 'and return pipe 42' is very large, the water stop valves 43 'and 44' cannot completely stop the water, resulting in an open cleaning process. The amount of water in the cleaning liquid storage tank 10 'is increasing, and eventually overflows. As a result, the cleaning liquid is infinitely diluted, the cleaning effect is not good, or the cost of the cleaning liquid is increased; (2) The heat exchange tube of the heat exchanger 40 'is often poorly radiated due to fouling and' required to be cleaned '. Generate a chemical reaction with scale 'causes a large amount of carbon dioxide gas to be generated. The carbon dioxide gas generated by such a violent and instant chemical reaction will penetrate the cleaning liquid through the return water stop valve 31 and self-open the cleaning liquid storage tank 1 〇' The burst spray is caused by the fact that the cleaning solution is often a strong acid. This burst spray phenomenon often poses a threat to the operator's work safety. [Improved technology and application methods] In view of the conventional cleaning methods of heat exchangers and their use, The above-mentioned various defects of the device, the present inventors set out to conceive, after painstaking research, the present invention finally came out, which is provided in the closed cleaning liquid storage tank with a circulation valve and a return valve to connect the circulation pipeline and the return pipeline In the heat exchanger, first close the cleaning water stop valve and the return water stop valve, and then open the cleaning valve and the air valve to clear the cleaning in the cleaning liquid storage tank. 'Close the cleaning valve and open the feeding valve to feed a certain amount of cleaning liquid in the cleaning liquid storage tank, and then close the feeding valve and open the return water stop valve (the valve and slowly open the return valve' to exclude the cleaning liquid storage tank. Residual air, finally close the air valve and fully open the circulation valve, return valve, and cleaning water valve 'restart the circulation pump to circulate the cleaning liquid between the pipeline, the heat exchanger and the cleaning liquid storage tank' to clean the heat exchanger Can indeed achieve effective recycling

Page 5 45105 4 V. Description of the invention (3) Washing heat exchanger ’can prevent the overflow of cooling water, the dilution of cleaning liquid and the lack of gas burst, and effectively save the cleaning liquid. [Objective of the Invention] Therefore, the main purpose of the present invention is to provide a method and a device for cleaning a heat exchanger, which are mainly provided with a circulation valve and a return valve on a closed cleaning liquid storage tank to connect the circulation pipeline and The return pipe is connected to the heat exchanger, so that it forms a recirculating closed heat-parent heat exchanger cleaning device. By starting the circulation pump, the cleaning liquid is circulated between the pipeline, the heat exchanger and the cleaning liquid storage tank to clean the heat. The exchanger can indeed achieve effective circulating cleaning of the heat exchanger, and effectively save cleaning fluid. A secondary object of the present invention is to provide a method and a device for cleaning a heat exchanger, which can be used to remove cleaning liquid by providing a cleaning water stop valve, a return water stop valve, a cleaning valve, and an air valve * on a closed cleaning liquid storage tank. The cleaning liquid in the storage tank and the residual air in the cleaning liquid storage tank are excluded, and the overflow of cooling water, the dilution of the cleaning liquid and the absence of gas bursts are prevented, and the effect of the cleaning liquid is effectively saved. [Embodiment] The other objects and detailed manufacturing methods and devices of the present invention will be made more detailed by the following detailed description. It is clear that referring to the attached circles at the same time, the technical content of the present invention can be further improved. It is further revealed. "First, please refer to the second figure. The heat exchanger cleaning device of the present invention mainly includes a cleaning liquid storage tank 10, a circulation pipeline 20, a return pipeline 30, and a heat exchanger. 40 and other components, the cleaning liquid storage tank 10 is 1 closed type, and has a circulation valve 11 and a return valve 12 at both ends to connect

451 05 4 V. Description of the invention (4) Connected to the circulation line 20 and the return line 3 0 'and provided with a feeding valve 13 to feed the cleaning liquid, and an air valve 14 and a cleaning valve 15; The circulation pipeline 20 is connected to the water inlet pipe 4 1 of the heat exchanger 40, and a circulation pump 21 is provided at an appropriate place of the circulation pipeline 20, and the water stop valve 2 2 is cleaned; the return pipeline 30 is connected to the return pipe 42 of the heat exchanger 40, and a return water stop valve 3 1 is provided at the appropriate place; the heat exchanger 40 is connected to the cooling water tower by the return pipe 42 and the water inlet pipe 41. 50 'and the return pipe 4 2, the water inlet pipe 4 1 is provided with a water stop valve 4 3, 44 at the appropriate place. The closed type cleaning liquid storage tank 10 is provided with a circulation valve 11 and a return valve 12 to connect the circulation pipeline 2 0 and the return pipeline 3 0 to the water inlet pipe 4 of the heat exchanger 4 1 and the return water pipe 4 2. In order to form a circulating closed heat exchanger cleaning device, when the circulating pump 21 is started, the cleaning liquid is placed in the closed cleaning liquid storage tank 10 through the circulation pipeline 2 and the water inlet 41 into the heat exchange. The heat exchanger 40 is cleaned in the device 40, and the cleaning liquid after the cleaning is returned to the closed cleaning liquid storage tank 10 through the return pipe 42, and the heat exchanger 40 is cleaned in a closed circulation; and the circulation pipeline 2 is cleaned. 〇 and the return line 30 are provided with a cleaning water stop valve 2 2. The return water stop valve 3 1 is closed before cleaning to prevent cooling water from flowing to the cleaning liquid storage tank 10; and a cleaning valve 1 is provided. 5 and air valve 1 4. When opened, the cleaning liquid in the cleaning liquid storage tank 丄 〇 can be completely removed; when cooling water is allowed to flow into the cleaning liquid storage tank i 〇, the residual air in the cleaning liquid storage tank i 〇 The air valve 14 is discharged. In addition, please refer to the heat exchanger cleaning method of the present invention shown in the third figure at the same time. The main steps are as follows: (a) Water stop: Close the flow of the cleaning water stop valve 22 and the return water stop valve 451054

V. Description of the invention (5)

The pipeline valve to the closed cleaning liquid storage tank 1 〇 to prevent cold-. Flow to the cleaning liquid storage tank 1 〇; i (b) clear the cleaning liquid storage tank 10: open the cleaning valve 15 and the air valve operator 4 'make the cleaning liquid The cleaning liquid in the storage tank 10 is completely removed: (c) Loading the cleaning liquid: Close the cleaning valve 15 and open the feeding valve 丄 3 Feed a certain amount of cleaning liquid in the cleaning liquid storage tank i 〇; (d) Exhaust residual air: Close the feed valve 13 and open the return water stop valve 31 and slowly open the return valve 12 to make the cooling water flow into the cleaning liquid storage tank 10 and force the residual air in it to be discharged from the air valve 14; (e) Cleaning: Close the air valve 14 and fully open the return valve 12, the circulation valve 1 1. Clean the water stop valve 22, and then start the circulation pump 2 1 so that the cleaning liquid is in the circulation pipeline 2 0 and the return pipeline 3 0 , Heat exchanger 40 and cleaning liquid storage tank 10 cycles * to clean the heat exchanger 40. By first closing the cleaning water stop valve 2 2, the return water stop valve 3 1 and the line valve to the closed cleaning liquid storage tank 10, the cooling water will not flow to the cleaning liquid storage tank 10, so there is no need to worry about The problem of overflow or dilution of the cleaning liquid caused by the water valve 4 3, 4 4 not being tightly closed, has a better cleaning effect and can save the amount of cleaning liquid. When the cleaning valve 15 and the air valve 14 are opened, the The cleaning liquid in the cleaning liquid storage tank 10 is completely removed: Secondly, close the feeding valve 13 and open the return water stop valve 31 and slowly open the return valve 12 to allow cooling water to flow into the cleaning liquid storage tank 1 〇 'It can force the residual air in it to be discharged from the air valve 14;

451054 V. Description of the invention (6) and fully open the circulation valve 1 1. Return valve 1 2. After cleaning the water stop valve 2 2 'restart the circulation pump 2 1 to make the cleaning liquid in the pipeline, the heat exchanger 40 and The cleaning liquid storage tank is circulated between 10 to clean the heat exchanger 40, and the carbon dioxide generated by the chemical reaction between the cleaning liquid and scale is naturally discharged to the outside through the return water pipe 42, so no gas burst is generated. Phenomenon. In summary, the method and device for cleaning a heat exchanger according to the present invention are pumped at the start cycle to circulate the cleaning liquid between the pipeline, the heat exchanger, and the cleaning liquid storage tank. Achieving effective cycle cleaning of the heat exchanger 'can prevent the overflow of cooling water, the dilution of the cleaning liquid and the lack of gas bursts, and effectively save the cleaning liquid. The present invention indeed has the effect of increasing the efficiency and increasing the value of the product. , It completely improved the lack of structure of the stationery 'and has not disclosed it before the application, it is indeed novel and progressive, and it is in line with the elements of the invention patent. It has submitted an application in accordance with the law. However, the above are only the preferred embodiments of the present invention, and have achieved a wide range of practical effects, that is, all equal changes and modifications made in accordance with the scope of the patent application of the present invention should still be within the scope of the patent covered by the present invention. .

451054_ Simple description of the circle type [Simple illustration of the figure] The first one is a schematic diagram of a conventional open heat exchanger cleaning device. The second figure is a schematic diagram of the heat exchanger cleaning device of the present invention. The third figure is a flowchart of the heat exchanger cleaning method of the present invention. [Illustration of drawing number] 10 Cleaning liquid storage tank 10 'Open type cleaning liquid storage tank 11 Circulating valve 12 Return valve 13 Feed valve 14 Air valve 15 Cleaning width 20, 20' Circulating pipeline 2 1, 2 1 'Circulating pump 2 2 '22' Cleaning water stop valve 3 0, 3 0 'Return line 31, 31' Return water stop valve 4 0, 4 0 'Heat exchanger 4 1, 4 1' Inlet pipe 4 2, 4 2 'Back Water pipes 43, 43 ', 44, 44' Water stop valve 5 0 Cooling water tower

Claims (1)

45 彳 05 4 VI. Application for patent scope 1. A heat exchanger cleaning method, the main steps are as follows: (a) Water stop: Close the pipeline valve flowing to the closed cleaning liquid storage tank to prevent cooling water from flowing to the cleaning liquid storage tank . (b) Clearing the cleaning liquid storage tank: Open the cleaning valve and air valve to completely remove the cleaning liquid in the cleaning liquid storage tank. (c) Fill the cleaning liquid: Close the cleaning valve and open the feeding valve to feed a certain amount of cleaning liquid into the closed cleaning liquid storage tank. (d) Excluding residual air: Close the feed valve and open the return water stop valve and slowly open the return valve, so that the cooling water flows into the cleaning liquid storage tank, forcing the residual air in it to be discharged from the air valve. (e) Cleaning: Close the air valve and fully open the circulation valve, return valve, and cleaning water stop valve, and then start the circulation pump to circulate the cleaning liquid between the pipeline, the heat exchange Is, and the cleaning liquid storage tank to clean the heat exchange.器 ^ 2 · A heat exchanger cleaning device, which mainly includes: The cleaning liquid storage tank is closed type, and has a circulation chamber and a return valve at both ends to connect to the circulation pipeline and the return pipeline, It is also equipped with a feeding valve to feed the cleaning liquid, and an air valve and a cleaning valve; a water inlet pipe, which is a valve of the circulation pipeline; a return water pipe, which is connected to the cooling water tower where appropriate, and has a water stop. The circulation pipeline is connected to the appropriate place of the heat exchanger, which is provided with a circulating pump, and the water stop is cleaned. The return pipeline is connected to the heat exchanger, which is provided with a return water stop valve and a return valve. The return pipe and the inlet pipe are provided separately. Page 11