Cleaning device of heater

Abstract

The utility model belongs to the technical field of chemical production, and particularly relates to a heater cleaning device which comprises an acid pickling pipeline and a water washing pipeline, the acid pickling pipeline comprises a hydrochloric acid storage tank, an acid pickling circulating pump, a first-stage heater, a first-stage evaporator, a second-stage heater and a second-stage evaporator, the hydrochloric acid storage tank is connected with the first-stage heater and the second-stage heater through the pickling circulating pump and the acid supply pipeline, the first-stage heater and the second-stage heater are connected with the first-stage evaporator and the second-stage evaporator respectively, and the first-stage evaporator and the second-stage evaporator are connected with the hydrochloric acid storage tank through the acid return pipeline; the washing pipeline comprises a condensed water tank, a washing circulating pump, a liquid seal tank, a backwashing pipeline and a water conveying pipeline, the condensed water tank is connected with an upper shell pass inlet of the primary heater through the washing circulating pump and the backwashing pipeline, and a lower shell pass outlet of the primary heater is connected with the liquid seal tank through the water conveying pipeline. The device solves the problem that the shell pass of the first-stage heater and graphite holes of the first-stage heater and the second-stage heater are seriously scaled.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and particularly relates to a cleaning device for a heater. Background Art

[0002] Polyferric sulfate is an inorganic polymer flocculant with excellent performance, and is widely used in the fields of water purification treatment such as drinking water, industrial water, various industrial wastewaters and urban sewage.

[0003] The process flow of concentrating low-concentration polyferric sulfate is as follows: the initial product liquid of low-concentration polyferric sulfate is pumped into the first-stage circulation loop by a feeding pump, after evaporation and concentration in the first-stage circulation loop, it is pumped into the second-stage circulation loop by a series pump, after being concentrated by the second-stage evaporator, the liquid overflows to the third-stage evaporator, after further concentration by the third-stage evaporation, the qualified liquid overflows to the transfer tank, and finally is pumped into the finished product tank by the transfer tank.

[0004] The existing polyferric sulfate production process uses artificial rutile mother liquor and concentrated sulfuric acid as the main raw materials. After the raw materials are mixed in a certain proportion, hydrolysis and polymerization reactions are carried out in a reaction kettle to produce the initial product liquid of polyferric sulfate. The initial product liquid of polyferric sulfate is then concentrated by a multi-effect concentration device to produce qualified polyferric sulfate liquid. This process can maximize the utilization of artificial rutile mother liquor, reduce the external discharge amount and the neutralization slag output. However, the total iron content of the initial product liquid of polyferric sulfate is relatively low and cannot meet the production index requirements, and qualified polyferric sulfate liquid can only be produced after concentration by a multi-effect concentration device.

[0005] However, the current multi-effect concentration device has the following defects in the actual production process: 1) Since the polyferric sulfate liquid has unstable properties, solid precipitates are easily precipitated during the concentration process, blocking the graphite holes of the first-stage and second-stage heaters and affecting the normal operation of the system; 2) During the concentration process, the first-stage heater uses the secondary steam from the second-stage evaporator as the heat source, and a small amount of liquid-phase polyferric sulfate in the secondary steam is easily precipitated as solid precipitates, blocking the shell side of the first-stage heater and affecting the concentration heat exchange effect; 3) In order to ensure the normal operation of production, it is necessary to frequently stop the machine, disassemble and clean the first-stage and second-stage heaters as a whole, resulting in a large amount of maintenance work, low equipment utilization rate, high operation cost, high labor intensity and very troublesome operation.

[0006] Therefore, there is an urgent need for a cleaning device for a heater to solve the above problems. Summary of the Utility Model

[0007] In view of the above-mentioned defects existing in the prior art, the present utility model provides a cleaning device for a heater, which includes a pickling pipeline and a water washing pipeline. The pickling pipeline includes a hydrochloric acid storage tank, a pickling circulating pump, a primary heater, a primary evaporator, a secondary heater, a secondary evaporator, an acid supply pipeline and an acid return pipeline. The acid outlet of the hydrochloric acid storage tank is connected to the inlet end of the pickling circulating pump. The outlet end of the pickling circulating pump is respectively connected to the feed inlets of the primary heater and the secondary heater through the acid supply pipeline. The discharge outlet of the primary heater is connected to the feed inlet of the primary evaporator, and the discharge outlet of the secondary heater is connected to the feed inlet of the secondary evaporator. The discharge outlets of the primary evaporator and the secondary evaporator are respectively connected to the acid inlet of the hydrochloric acid storage tank through the acid return pipeline.

[0008] The water washing pipeline includes a condensate tank, a water washing circulating pump, a liquid seal tank, a backwashing pipeline and a water conveying pipeline. The water outlet of the condensate tank is connected to the inlet end of the water washing circulating pump. The outlet end of the water washing circulating pump is connected to the inlet of the upper shell side of the primary heater through the backwashing pipeline. The outlet of the lower shell side of the primary heater is connected to the water inlet of the liquid seal tank through the water conveying pipeline.

[0009] Optionally, an electric control valve is provided on the acid supply pipeline.

[0010] Optionally, the backwashing pipeline and the inlet of the upper shell side of the primary heater are connected by a flange.

[0011] Optionally, a booster pump and a filter are further provided on the acid return pipeline. The filter includes a housing. One end of the housing is provided with a filter inlet, and the other end is provided with a filter outlet. The top of the housing is provided with a top cover, and a filter assembly is arranged inside the housing.

[0012] Optionally, the filter assembly includes a first filter screen, a filter membrane and a second filter screen. The first filter screen is arranged at one end close to the filter inlet, the second filter screen is arranged at one end close to the filter outlet, and the filter membrane is arranged between the first filter screen and the second filter screen. The pore diameters of the first filter screen, the filter membrane and the second filter screen decrease in sequence.

[0013] Optionally, both the first filter screen and the second filter screen are made of stainless steel filter screens resistant to acid and alkali corrosion, and the material of the filter membrane is polytetrafluoroethylene, polypropylene or polyvinylidene fluoride.

[0014] The present utility model further includes other components that can enable the normal use of the cleaning device for a heater, all of which are conventional technical means in the art. In addition, the devices or components not defined in the present utility model all adopt conventional technical means in the art.

[0015] The working principle of the present utility model is as follows: during pickling, hydrochloric acid in the hydrochloric acid storage tank enters the primary heater and the secondary heater through the pickling circulation pump and the acid supply pipeline, so as to pickle the interiors of the primary heater and the secondary heater, and use hydrochloric acid to remove the solid polyferric sulfate adhering to the inner walls of the primary heater and the secondary heater. Subsequently, the hydrochloric acid enters the primary evaporator and the secondary evaporator, so as to pickle the interiors of the primary evaporator and the secondary evaporator, and use hydrochloric acid to remove the solid polyferric sulfate adhering to the inner walls of the primary evaporator and the secondary evaporator. Finally, the hydrochloric acid returns to the hydrochloric acid storage tank through the acid return pipeline; the filter can filter the hydrochloric acid flowing back after pickling and filter out the solid impurities therein, facilitating the recycling of hydrochloric acid; in addition, the primary heater and the secondary heater can be cleaned separately. During water washing, the hot water in the condensate tank enters the upper shell pass of the primary heater through the water washing circulation pump and the backwashing pipeline, and then flows out from the outlet of the lower shell pass to clean the entire shell pass of the primary heater and wash away the solid polyferric sulfate adhering thereto. Subsequently, the hot water flows into the liquid seal tank through the water conveying pipeline, and the liquid seal tank is used to create a negative pressure in the primary evaporator.

[0016] The beneficial effects of the present utility model are as follows: the structure is simple, the design is reasonable, and the operation is convenient; by arranging the pickling pipeline and the water washing pipeline, the problem of serious scaling in the shell pass of the primary heater, the graphite holes of the primary heater and the secondary heater is solved, and the scaling on the inner walls of the primary heater, the primary evaporator, the secondary heater and the secondary evaporator can be removed, improving the production efficiency and reducing the workload of workers. Brief Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0019] Figure 2 It is a schematic diagram of the structure of the filter of the present utility model.

[0020] In the figure: 1. Hydrochloric acid storage tank, 2. Pickling circulation pump, 3. Primary heater, 4. Primary evaporator, 5. Secondary heater, 6. Secondary evaporator, 7. Acid supply pipeline, 8. Acid return pipeline, 9. Electric control valve, 10. Booster pump, 11. Filter, 12. Shell, 13. Filter inlet, 14. Filter outlet, 15. Top cover, 16. First filter screen, 17. Filter membrane, 18. Second filter screen, 19. Condensate tank, 20. Water washing circulation pump, 21. Liquid seal tank, 22. Backwashing pipeline, 23. Water conveying pipeline. Detailed Embodiments

[0021] The present utility model will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present utility model and specific embodiments. The description here is only used to explain the present utility model, but not to limit the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present utility model.

[0022] Embodiment

[0023] As Figure 1-2 shown, the embodiment of the present utility model provides a cleaning device for a heater, including a pickling pipeline and a water washing pipeline. The pickling pipeline includes a hydrochloric acid storage tank 1, a pickling circulation pump 2, a primary heater 3, a primary evaporator 4, a secondary heater 5, a secondary evaporator 6, an acid supply pipeline 7 and an acid return pipeline 8. The acid outlet of the hydrochloric acid storage tank 1 is connected to the inlet end of the pickling circulation pump 2. The outlet end of the pickling circulation pump 2 is respectively connected to the feed inlets of the primary heater 3 and the secondary heater 5 through the acid supply pipeline 7. The discharge outlet of the primary heater 3 is connected to the feed inlet of the primary evaporator 4, and the discharge outlet of the secondary heater 5 is connected to the feed inlet of the secondary evaporator 6. The discharge outlets of the primary evaporator 4 and the secondary evaporator 6 are respectively connected to the acid inlet of the hydrochloric acid storage tank 1 through the acid return pipeline 8. An electric control valve 9 is arranged on the acid supply pipeline 7.

[0024] A booster pump 10 and a filter 11 are also arranged on the acid return pipeline 8. The filter 11 includes a housing 12. One end of the housing 12 is provided with a filter inlet 13, and the other end is provided with a filter outlet 14. The top of the housing 12 is provided with a top cover 15. A filter assembly is arranged inside the housing 12. The filter assembly includes a first filter screen 16, a filter membrane 17 and a second filter screen 18. The first filter screen 16 is arranged at one end close to the filter inlet 13, the second filter screen 18 is arranged at one end close to the filter outlet 14, and the filter membrane 17 is arranged between the first filter screen 16 and the second filter screen 18. The mesh pore diameters of the first filter screen 16, the filter membrane 17 and the second filter screen 18 decrease in sequence. Among them, both the first filter screen 16 and the second filter screen 18 are made of stainless steel filter screens resistant to acid and alkali corrosion, and the filter membrane 17 is made of a polytetrafluoroethylene filter membrane.

[0025] The water washing pipeline includes a condensate tank 19, a water washing circulation pump 20, a liquid seal tank 21, a backwashing pipeline 22 and a water delivery pipeline 23. The water outlet of the condensate tank 19 is connected to the inlet end of the water washing circulation pump 20. The outlet end of the water washing circulation pump 20 is connected to the upper shell side inlet of the primary heater 3 through the backwashing pipeline 22. The lower shell side outlet of the primary heater 3 is connected to the water inlet of the liquid seal tank 21 through the water delivery pipeline 23. The backwashing pipeline 22 and the upper shell side inlet of the primary heater 3 are connected by a flange.

[0026] The working principle of the present utility model is as follows. During pickling, hydrochloric acid in the hydrochloric acid storage tank 1 enters the primary heater 3 and the secondary heater 5 through the pickling circulation pump 2 and the acid supply pipeline 7, so as to pickle the interiors of the primary heater 3 and the secondary heater 5, and use hydrochloric acid to remove the solid polyferric sulfate adhering to the inner walls of the primary heater 3 and the secondary heater 5. Subsequently, the hydrochloric acid enters the primary evaporator 4 and the secondary evaporator 6, so as to pickle the interiors of the primary evaporator 4 and the secondary evaporator 6, and use hydrochloric acid to remove the solid polyferric sulfate adhering to the inner walls of the primary evaporator 4 and the secondary evaporator 6. Finally, the hydrochloric acid returns to the hydrochloric acid storage tank 1 through the acid return pipeline 8; the filter 11 can filter the hydrochloric acid flowing back after pickling, and filter out the solid impurities therein, facilitating the recycling of hydrochloric acid; in addition, the primary heater 3 and the secondary heater 5 can be cleaned separately. During water washing, hot water in the condensate tank 19 enters the upper shell side of the primary heater 3 through the water washing circulation pump 20 and the backwashing pipeline 22, and then flows out from the outlet of the lower shell side, cleaning the entire shell side of the primary heater 3 and flushing the solid polyferric sulfate adhering thereto. Subsequently, the hot water flows into the liquid seal tank 21 through the water conveying pipeline 23, and the liquid seal tank 21 is used to create a negative pressure in the primary evaporator 4.

[0027] The embodiments of the present utility model have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A cleaning device for a heater, comprising an acid cleaning pipeline and a water cleaning pipeline, characterized in that: The pickling pipeline includes a hydrochloric acid storage tank, a pickling circulation pump, a primary heater, a primary evaporator, a secondary heater, a secondary evaporator, an acid supply pipeline and an acid return pipeline. The acid outlet of the hydrochloric acid storage tank is connected to the inlet end of the pickling circulation pump, the outlet end of the pickling circulation pump is respectively connected to the feed inlets of the primary heater and the secondary heater through the acid supply pipeline, the discharge port of the primary heater is connected to the feed inlet of the primary evaporator, and the discharge port of the secondary heater is connected to the feed inlet of the secondary evaporator, and the discharge ports of the primary evaporator and the secondary evaporator are respectively connected to the acid inlet of the hydrochloric acid storage tank through the acid return pipeline; The water washing pipeline includes a condensate tank, a water washing circulation pump, a liquid seal tank, a backwash pipe and a water supply pipe. The water outlet of the condensate tank is connected to the inlet of the water washing circulation pump, the outlet of the water washing circulation pump is connected to the upper shell inlet of the first-stage heater through the backwash pipe, and the lower shell outlet of the first-stage heater is connected to the water inlet of the liquid seal tank through the water supply pipe.

2. The cleaning device for a heater according to claim 1, characterized in that: An electric regulating valve is provided on the acid supply pipeline.

3. The cleaning device for a heater according to claim 2, characterized in that: The backwash pipe is connected to the upper shell inlet of the first-stage heater through a flange.

4. The cleaning device for a heater according to claim 3, characterized in that: A booster pump and a filter are also provided on the acid return pipeline. The filter comprises a shell, one end of the shell is provided with a filter inlet, the other end is provided with a filter outlet, a top cover is provided on the top of the shell, and a filter assembly is provided inside the shell.

5. The cleaning device for a heater according to claim 4, characterized in that: The filter assembly includes a first filter screen, a filter membrane and a second filter screen. The first filter screen is arranged at one end close to the filter inlet, the second filter screen is arranged at one end close to the filter outlet, the filter membrane is arranged between the first filter screen and the second filter screen, and the mesh apertures of the first filter screen, the filter membrane and the second filter screen decrease in sequence.

6. The cleaning device for a heater according to claim 5, characterized in that: The first filter screen and the second filter screen are both made of acid- and alkali-resistant stainless steel filter screens, and the filter membrane is made of polytetrafluoroethylene, polypropylene or polyvinylidene fluoride.

Images