Backwashing device of heat exchanger
By designing a backwash device in the heat exchanger, the problem of shortening the use cycle and high cleaning costs caused by gray water scale is solved, and effective backwashing of gray water and extending the heat exchanger life is achieved.
Patent Information
- Application Number
- CN202421078138.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-17
AI Technical Summary
In the pressurized gasification process of pulverized coal, the black water after the gasification furnace and the scrubber are high in the heat exchanger due to the high alkalinity and hardness, which leads to the accelerated scale rate of the gray water, which affects the use cycle of the heat exchanger. Frequent and expensive.
A heat exchanger backwashing device is designed, including inlet and outlet pipelines, valves, sub-wires and backwashing pipelines. The backwashing of the grey water inside the heat exchanger is achieved through the backwashing pipelines and valves, removing precipitates and foreign matters, and extending the The service cycle of the heat exchanger.
It effectively reduces the scale rate of gray water, extends the service cycle of heat exchangers, reduces frequent cleaning and dismantling and inspection workload, and reduces costs.
Smart Images
Figure CN222257928U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, in particular to a backwashing device for a heat exchanger. Background Art
[0002] In the pulverized coal pressurized gasification process, the black water from the gasifier, cyclone separator and washing tower is flashed in the high-pressure flash tank and then enters the low-pressure flash system for further flashing. The black water flashed in the low-pressure flash tank enters the vacuum flash system, and the non-condensable gas flashed is vented. At the same time, the black water is further concentrated and flows into the sedimentation tank by gravity. In order to ensure the flocculation and sedimentation of the black water, a certain amount of flocculant is added to the outlet of the true flash liquid, so that the solid particles in the black water can be well flocculated and settled in the sedimentation tank, thereby purifying the gasification water system. Part of the cleaner water at the top of the sedimentation tank overflows into the gray water tank for circulating water; part of it is sent to the external drainage tank, and then sent to the sewage treatment station for treatment after cooling through the wastewater pump and the heat exchanger. The water temperature of the gasification gray water system is normally around 70°C, while the water temperature required by the sewage station is around 35°C. In order to meet the water quality requirements of the sewage station, a heat exchanger is added at the outlet of the wastewater pump for heat exchange and cooling. Since the gasification ash water has the characteristics of high alkalinity, high hardness and easy scaling, the resistance increases and the flow rate decreases when passing through the heat exchanger, which leads to the accelerated scaling rate of the ash water in the heat exchanger, affecting the service life of the heat exchanger, frequent cleaning of the heat exchanger, high cost and heavy workload of disassembly and cleaning of the heat exchanger. The heat exchanger is equipped with a backwash device in the circulating water pipeline, while the material ash water medium pipeline is not equipped with a backwash device, and the backwash operation cannot be performed. Therefore, the utility model proposes a backwash device for the heat exchanger. Utility Model Content
[0003] In view of the deficiencies in the prior art, the utility model provides a heat exchanger backwashing device to solve the problems of accelerated scaling rate of ash water inside the heat exchanger, affecting the service life of the heat exchanger, frequent cleaning of the heat exchanger, high cost and heavy workload for disassembly and cleaning of the heat exchanger.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heat exchanger backwash device, comprising a heat exchanger, wherein a heat exchanger inlet pipeline is fixedly installed on the front side of the heat exchanger, and a heat exchanger inlet valve is installed on the heat exchanger inlet pipeline, a heat exchanger outlet pipeline is fixedly installed on the rear side of the heat exchanger, and a heat exchanger outlet valve, an outlet main valve and a temperature measuring point are installed on the heat exchanger outlet pipeline, a heat exchanger sub-line is also connected between the heat exchanger inlet pipeline and the heat exchanger outlet pipeline, a heat exchanger backwash pipeline is installed on the heat exchanger inlet pipeline at a side of the heat exchanger inlet valve close to the heat exchanger, and a backwash control valve is installed on the heat exchanger backwash pipeline, and a heat exchanger circulating water inlet pipeline and a heat exchanger circulating water outlet pipeline are also installed on the heat exchanger.
[0005] As a preferred technical solution of the utility model, the heat exchanger sub-line is arranged before the heat exchanger inlet valve and before the outlet main valve.
[0006] As a preferred technical solution of the utility model, two bypass valves of the heat exchanger are provided, namely a first bypass valve and a second bypass valve, and the first bypass valve is provided on a side close to the inlet pipeline of the heat exchanger, and the second bypass valve is provided on a side close to the outlet pipeline of the heat exchanger.
[0007] As a preferred technical solution of the utility model, the diameter of the backwash pipeline of the heat exchanger is consistent with the diameter of the inlet pipeline of the heat exchanger.
[0008] Compared with the prior art, the beneficial effects of the utility model are:
[0009] The utility model discloses a heat exchanger backwashing device, which is easy to install and use, and solves the problems of fast scaling rate of ash water inside the heat exchanger, affecting the service life of the heat exchanger, frequent cleaning of the heat exchanger, high cost and heavy workload of heat exchanger disassembly and cleaning.
[0010] Other features and advantages of the present invention will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0012] In the figure: 1. heat exchanger, 2. heat exchanger inlet pipeline, 3. heat exchanger inlet valve, 4. heat exchanger outlet pipeline, 5. heat exchanger outlet valve, 6. outlet main valve, 7. heat exchanger bypass line, 8. first bypass line valve, 9. second bypass line valve, 10. heat exchanger backwash pipeline, 11. backwash control valve, 12. heat exchanger circulating water inlet pipeline, 13. heat exchanger circulating water outlet pipeline, 14. temperature measuring point. DETAILED DESCRIPTION
[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0014] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0015] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0016] See also Figure 1 In this embodiment, a heat exchanger backwashing device is provided, including a heat exchanger 1, a heat exchanger inlet pipeline 2 is fixedly installed on the front side of the heat exchanger 1, and a heat exchanger inlet valve 3 is installed on the heat exchanger inlet pipeline 2, a heat exchanger outlet pipeline 4 is fixedly installed on the rear side of the heat exchanger 1, and a heat exchanger outlet valve 5, an outlet main valve 6 and a temperature measuring point 14 are installed on the heat exchanger outlet pipeline 4, a heat exchanger sub-line 7 is also connected between the heat exchanger inlet pipeline 2 and the heat exchanger outlet pipeline 4, and the heat exchanger A heat exchanger backwash pipeline 10 is installed on the inlet pipeline 2 at a side of the heat exchanger inlet valve 3 close to the heat exchanger 1, and a backwash control valve 11 is installed on the heat exchanger backwash pipeline 10. A heat exchanger circulating water inlet pipeline 12 and a heat exchanger circulating water outlet pipeline 13 are also installed on the heat exchanger 1. After the heat exchanger 1 runs for a certain period of time, the heat exchanger 1 is backwashed through the backwash pipeline and valve to remove foreign matter such as dust and scale deposited inside, thereby improving the heat exchange effect of the heat exchanger 1 and extending the service life.
[0017] Furthermore, the heat exchanger sub-line 7 is arranged before the heat exchanger inlet valve 3 and before the outlet main valve 6 .
[0018] Furthermore, two bypass valves are provided in the heat exchanger, namely the first bypass valve 8 and the second bypass valve 9, and the first bypass valve 8 is provided on a side close to the heat exchanger inlet pipeline 2, and the second bypass valve 9 is provided on a side close to the heat exchanger outlet pipeline 4, so as to avoid or reduce dust accumulation and scaling.
[0019] Furthermore, the diameter of the heat exchanger backwash pipeline 10 is consistent with the diameter of the heat exchanger inlet pipeline 2. According to the change of the heat exchanger outlet temperature, a regular backwashing system is formulated to ensure the backwashing effect.
[0020] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0021] When in use, open the heat exchanger bypass valves 8 and 9 to allow the gray water to flow from the bypass line to the outlet pipeline; close the heat exchanger inlet valve 3, open the backwash control valve 11, and finally close the heat exchanger outlet master control valve 6 to allow the gray water to backwash from the outlet of the heat exchanger 1 to the inlet, thereby achieving backwashing of the heat exchanger 1. In order to prevent the gray water from scaling and becoming solid in the heat exchanger tubes, a reasonable backwash cycle is formulated according to the water quality characteristics and the heat exchanger outlet temperature to ensure the backwash effect, extend the heat exchanger operation cycle, and reduce the disassembly and inspection workload and cleaning costs.
[0022] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A heat exchanger backwashing device, characterized in that: The invention comprises a heat exchanger (1), wherein a heat exchanger inlet pipeline (2) is fixedly installed on the front side of the heat exchanger (1), and a heat exchanger inlet valve (3) is installed on the heat exchanger inlet pipeline (2); a heat exchanger outlet pipeline (4) is fixedly installed on the rear side of the heat exchanger (1), and a heat exchanger outlet valve (5), an outlet main valve (6) and a temperature measuring point (14) are installed on the heat exchanger outlet pipeline (4); and the heat exchanger inlet pipeline (2) and the heat exchanger inlet valve (3) are fixedly installed on the rear side of the heat exchanger (1). A heat exchanger secondary line (7) is also connected between the heat exchanger outlet pipeline (4); a heat exchanger backwash pipeline (10) is installed on the heat exchanger inlet pipeline (2) at a position on the side of the heat exchanger inlet valve (3) close to the heat exchanger (1), and a backwash control valve (11) is installed on the heat exchanger backwash pipeline (10); and a heat exchanger circulating water inlet pipeline (12) and a heat exchanger circulating water outlet pipeline (13) are also installed on the heat exchanger (1).
2. A heat exchanger backwashing device according to claim 1, characterized in that: The heat exchanger secondary line (7) is arranged before the heat exchanger inlet valve (3) and before the outlet main valve (6).
3. A heat exchanger backwashing device according to claim 1, characterized in that: The heat exchanger has two bypass valves, namely a first bypass valve (8) and a second bypass valve (9), and the first bypass valve (8) is arranged at a side position close to the heat exchanger inlet pipeline (2), and the second bypass valve (9) is arranged at a side position close to the heat exchanger outlet pipeline (4).
4. A heat exchanger backwashing device according to claim 1, characterized in that: The diameter of the heat exchanger backwash pipeline (10) is consistent with the diameter of the heat exchanger inlet pipeline (2).