Descaling device of alkali liquor condensation device

Abstract

The utility model discloses a descaling device of an alkali liquor condensation device, and mainly relates to indigo production. The descaling device is arranged on the outer wall of a heat exchange pipe of the heat exchange evaporation device, and a plurality of semicircular grooves are formed in the heat exchange pipe in an array mode. The descaling device comprises a negative pressure adsorption assembly and a plurality of descaling assemblies connected with the negative pressure adsorption assembly, and each descaling assembly is provided with a plurality of runner cavities; the negative pressure airflow generated by the negative pressure assembly sucks cigarette ash from the flow channel cavity, meanwhile, air flows through the narrow flow channel cavity at a high speed, and the negative pressure airflow rubs on the suction inlet of the flow channel cavity and the wall face to generate vibration. The device disclosed by the utility model has the beneficial effects that the device is used for removing scale generated on the surface of the heat exchange tube when the alkali liquor condensation device is used for concentrating alkali liquor and removing soot generated in the heat exchange part of the alkali liquor condensation device due to accumulation of flue gas, and the soot is adsorbed while the scale is removed; therefore, the influence of other factors on the heat exchange efficiency of the alkali liquor condensation device is reduced.

Description

Technical Field

[0001] The utility model relates to the field of indigo production, in particular to a descaling device for an alkali solution condensation device. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] A large amount of alkali liquid is needed in the indigo production line. From the perspective of environmental protection, the low-concentration alkali liquid produced after use needs to be recycled and reused. The alkali liquid is evaporated and concentrated before recycling. The existing concentration method is to heat the bottom of the steamer through a burner to evaporate the excess water in the alkali liquid inside the steamer. For the evaporation process, since the heat exchange area of ​​the steamer is only the bottom of the steamer, the overall evaporation efficiency is not high and the energy waste is serious. In addition, the existing steamer of the production line is open. After heating the alkali liquid, it not only pollutes the environment but also causes heat loss.

[0004] Therefore, in order to further improve the efficiency of alkali liquid concentration and environmental protection in the production line, the flue gas generated by the combustion of the burner is utilized, so that the alkali liquid enters the tube and is heated by the flue gas. However, there are now two problems that need to be solved. First, due to the hardness of water in the alkali liquid, after the alkali liquid is heated and evaporated for a long time, a scale layer will appear in the heat exchange tube. If the scale layer accumulates too thick, it will affect the heat exchange efficiency, reducing the overall heat exchange efficiency of the production line by 20%. Therefore, it is necessary to clean the scale layer inside the heat exchange tube, but the internal space of the existing heat exchange device is limited and closed, and many internal parts of the heat exchange device will be corroded by chemical reagents, so many cleaning methods are limited. Second, because the flue gas heats the tubes in a unique space, after heating for too long, a large amount of smoke will be formed in this space, which will adhere to the surface of the heat exchange tube and affect the heat exchange, and will also accumulate in the independent space to affect the fluidity of the flue gas, so that the heat exchange tubes of each part are heated unevenly. After long-term accumulation, the heat exchange efficiency is greatly affected, so the above problems need to be solved urgently. Utility Model Content

[0005] The utility model aims to provide a descaling device for an alkali liquid condensation device, which is used to remove scale produced on the surface of a heat exchange tube when the alkali liquid condensation device is used to concentrate the alkali liquid, and to remove soot produced due to the accumulation of flue gas inside the heat exchange part of the alkali liquid condensation device, and to adsorb the soot synchronously when removing the scale, thereby reducing the influence of other factors on the heat exchange efficiency of the alkali liquid condensation device.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A descaling device for an alkali liquid condensation device, the descaling device is arranged on the outer wall of a heat exchange tube of a heat exchange evaporation device, and a plurality of semicircular grooves are arranged in an array on the heat exchange tube; the descaling device comprises a negative pressure adsorption component and a plurality of descaling components connected to the negative pressure adsorption component, and the descaling component is provided with a plurality of flow channel cavities; the negative pressure airflow generated by the negative pressure component sucks the ash from the flow channel cavity, and at the same time, the air flows through the narrow flow channel cavity at a high speed, and the negative pressure airflow generates vibration by friction at the suction port and the wall surface of the flow channel cavity, so that the descaling components at different positions resonate on the heat exchange tube, and the plurality of semicircular grooves on the heat exchange tube destroy the complete surface to which the scale is attached, so that the connection layer formed by the scale on the inner wall of the heat exchange tube is easily destroyed, thereby descaling multiple positions of the heat exchange tube.

[0008] The descaling assembly comprises a shell, a connecting port arranged on the shell, and a plurality of suction ports arranged on the shell, wherein gaps are left at the suction ports.

[0009] The heat exchange tube is provided with a baffle, and the descaling component is mirror-imaged with the baffle as a symmetry plane.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] It is used to remove scale produced on the surface of the heat exchange tube when the alkali solution condensation device is used to concentrate the alkali solution, and to remove the soot produced by the accumulation of flue gas inside the heat exchange part of the alkali solution condensation device, and to adsorb the soot synchronously when removing the scale, so as to reduce the influence of other factors on the heat exchange efficiency of the alkali solution condensation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 This is a view of the alkali solution condensation device of the utility model.

[0013] Attached Figure 2 It is a production line flow chart of the utility model.

[0014] Attached Figure 3 This is a view of the heat exchange part in the utility model.

[0015] Attached Figure 4 This is a heat exchange tube arrangement diagram in the utility model.

[0016] Attached Figure 5 It is a distribution diagram of the descaling device on a single heat exchange tube in the utility model.

[0017] Attached Figure 6 This is a view of the descaling device in the utility model.

[0018] Attached Figure 7 It is a cross-sectional view of the descaling device in the utility model.

[0019] Numbers shown in the accompanying drawings:

[0020] 1. Heat exchange tube; 2. Semicircular groove; 3. Flow channel cavity; 4. Shell; 5. Connection port; 6. Suction port; 7. Baffle; 8. Air inlet; 9. Air outlet; 10. Burner; 11. Fixing plate; 12. Fixed distance tube. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0022] The utility model is a descaling device for an alkali liquid condensation device. First, the heat exchange process of the heat exchange tube 1 is described: Figure 1 — Figure 4 The heat exchange part includes an air inlet 8 at the bottom of the heat exchange part and an air outlet 9 at the top of the heat exchange part. A plurality of heat exchange tubes 1 are arranged in the heat exchange part. A plurality of semicircular grooves 2 are arranged in an array on the heat exchange tubes 1. The bottom of the heat exchange tubes 1 is connected to the heat receiving part, and the top of the heat exchange tubes 1 is connected to the feed part. Alkali liquid flows inside the heat exchange tubes 1. A plurality of baffles 7 are arranged in a staggered manner in the heat exchange part. The air inlet 8 is used to recover the flue gas generated by the combustion of the burner 10. Because the flue gas also has heat when the burner 10 is burning, in order to make full use of energy, the flue gas generated by the burner 10 is introduced into the air inlet 8 of the heat exchange part, and the alkali liquid in the heat exchange tube 1 is heated by the heat of the flue gas. In order to make the flue gas stay in the heat exchange part for a long time and flow in an orderly manner, and further improve the heat exchange efficiency, the flow direction of the flue gas is controlled by a plurality of baffles 7 arranged in a staggered manner, and the flue gas flows upward according to the flow direction arranged by the baffles 7.

[0023] As attached Figure 1 — Figure 4 As for the fixation of the heat exchange tube 1, the heat exchange part is also provided with a fixing part for fixing multiple heat exchange tubes 1, and the fixing part includes a fixing plate 11 and multiple distance tubes 12; the fixing plate 11 is divided into two upper and lower parts, and the fixing plate 11 is used for the two ends of the multiple heat exchange tubes 1, and both ends of the heat exchange tubes 1 are exposed on the fixing plate 11, the heat exchange tube 1 and the fixing plate 11 are welded, and the multiple baffles 7 are arranged on the distance tubes 12.

[0024] For the connection between the fixing plate 11 and the heat exchange tube 1, as shown in the attached Figure 3As described above, the heat exchange tube 1 leaks out of the upper fixed plate 11 for a distance, and the alkali liquid flows into the upper fixed plate 11 through the liquid inlet described below. When the stored liquid level of the upper fixed plate 11 is higher than the distance of the heat exchange tube 1 leaking out of the upper fixed plate 11, the alkali liquid slowly flows into the heat exchange tube 1. Since the length of the heat exchange tube 1 is relatively long, after the alkali liquid flows into multiple heat exchange tubes 1, the low-concentration alkali liquid in the heat exchange tube 1 is heated by the flue gas, and falling film evaporation is formed in the heat exchange tube 1. The steam overflows from the feed part and is recovered. After evaporation, the high-concentration alkali liquid has a greater density than water and flows into the heat receiving part by its own weight. The principle of falling film evaporation is to use liquid to form a thin film on the tube wall, and complete the heat transfer process through evaporation and condensation. The heat receiving part is provided with a discharge pipeline, which directly passes through the bottom of the heat receiving part, and flows from the heat exchange tube 1 to the high-concentration alkali liquid at the bottom of the heat receiving part. After convergence, the discharge pipeline discharges the heated alkali liquid. Specifically, after the high-concentration alkali liquid enters the heat exchange tube 1, the alkali liquid forms a thin film on the wall of the heat exchange tube 1. At this time, the heat exchange tube 1 is heated by the flue gas, which increases the temperature of the liquid and generates steam. The steam rises inside the pipe and contacts the external cooling medium, causing the steam to condense into liquid, releasing a large amount of heat. Through the continuous cycle, the high-concentration alkali liquid completes the evaporation process inside the heat exchange tube 1, and finally achieves the purpose of concentration. During the whole process, the formation of the alkali liquid film and the alternation of evaporation and condensation are continuously carried out, so that the heat can be fully utilized and the heat transfer efficiency is improved.

[0025] It should be noted that, for the factors affecting the formation of the above-mentioned film, it is necessary to control the flow rate of the alkali solution when it enters the interior of the heat exchange tube 1, and the flow rate cannot be too fast. In order to control the flow rate of the alkali solution when it enters the interior of the heat exchange part, the heat exchange tube 1 is further improved: a plurality of semicircular grooves 2 are arranged in an array on the heat exchange tube 1, and the protruding direction of the semicircular grooves 2 can be toward the inside and outside of the pipeline, but for the convenience of processing, the protrusion toward the inside of the pipeline is selected. When the alkali solution flows slowly in the heat exchange tube 1, since the wall of the heat exchange tube 1 is not a flat surface, the semicircular grooves 2 change the flow direction of the alkali solution when the alkali solution flows through the semicircular grooves 2, thereby blocking the flow of the alkali solution, so that the flow rate of the alkali solution is further slowed down when it flows downstream.

[0026] The two problems that affect the heat exchange efficiency of the alkali liquid condensation device described in the background technology are: 1. scale inside the heat exchange tube 1, and 2. soot accumulated in the flue gas in the heat exchange part. These problems are solved by a descaling device:

[0027] Descaling device:

[0028] As attached Figure 5 — Figure 7The descaling device includes a negative pressure adsorption component and multiple descaling components connected to the negative pressure adsorption component. Multiple descaling components are vertically arranged on the outer wall of the heat exchange tube 1, and the descaling component is provided with multiple flow channel cavities 3; the descaling component includes a shell 4, a connecting port 5 arranged on the shell 4, and multiple suction ports 6 arranged on the shell 4, and the suction ports 6 have gaps.

[0029] The negative pressure adsorption component is a vacuum pump, which is connected to the connection port 5 of the descaling component through a pipeline. Since there are many descaling components, an adapter is required to connect multiple pipelines together so that the vacuum pump generates a negative pressure airflow that flows through each descaling component from the suction port 6, so that the generated negative pressure airflow flows through each suction port 6 on the shell 4.

[0030] As for the setting position of the descaling component, after the flue gas is introduced into the heat exchange part, the flow direction of the flue gas will be controlled by the baffle 7, so the smoke dust is mostly accumulated on the upper and lower surfaces of the baffle 7 and the outer wall of the heat exchange tube 1. Therefore, when setting the descaling component, the baffle 7 is used as the symmetry plane for mirror setting to suck away the smoke in the heat exchange part as soon as possible through negative pressure.

[0031] Due to the hardness of water in the alkaline solution, scale will be generated on the inner wall of the heat exchange tube 1. If it is not removed for a long time, it will affect the heat exchange effect, so the scale also needs to be removed. Since the internal space of the heat exchange part and the heat exchange tube 1 is limited and closed, and many parts in the heat exchange part will be corroded by chemical reagents, many cleaning methods are limited, and only mechanical vibration descaling can be used. In this way, it is combined with smoke removal. Using the Bernoulli principle, the faster the flow rate, the smaller the pressure. Therefore, when air flows through the narrow flow channel cavity 3 at high speed, the negative pressure airflow is compressed. At the same time, the negative pressure airflow will continuously rub against the suction port 6 and the wall of the flow channel cavity 3 to generate vibration, so that it resonates with the heat exchange tube 1 while inhaling smoke. As the flow rate of the negative pressure airflow increases, the vibration frequency and vibration amplitude will also increase. Another important factor for removing scale using the above method is that the heat exchange tube 1 described above is arrayed with a plurality of semicircular grooves 2. The semicircular grooves make the inner wall of the heat exchange tube 1 a non-continuous smooth surface, which not only has a blocking effect on the flow of alkali solution, but also can destroy the complete surface of the scale when scale is attached to the inner wall of the heat exchange tube 1, thereby reducing the degree of scale adhesion. At the same time, when the descaling component vibrates, the stress generated by the vibration of the descaling component is transmitted from multiple surfaces to the inner wall of the heat exchange tube 1, so that the connecting layer formed by the scale is easily destroyed, thereby making the scale on the inner wall of the heat exchange tube 1 easier to peel off.

[0032] Since the descaling component is disposed on the outer wall of the heat exchange tube 1 , in order to reduce the impact of the descaling component on the heat exchange efficiency of the heat exchange tube 1 , the shell 4 of the corresponding descaling component is made of aluminum, which has better thermal conductivity than iron and is light in weight.

[0033] In summary, the device is used to remove scale generated on the surface of the heat exchange tube 1 when the alkali solution condensation device is concentrating the alkali solution, and to remove the soot generated by the accumulation of flue gas inside the heat exchange part of the alkali solution condensation device, and to adsorb the soot synchronously when removing the scale, thereby reducing the influence of other factors on the heat exchange efficiency of the alkali solution condensation device.

Claims

1. A descaling device for an alkali solution condensation device, characterized in that: The descaling device is arranged on the outer wall of a heat exchange tube (1) of an alkali solution condensation device, and a plurality of semicircular grooves (2) are arranged in an array on the heat exchange tube (1); The descaling device comprises a negative pressure adsorption component and a plurality of descaling components connected to the negative pressure adsorption component, wherein the descaling component is provided with a plurality of flow channel cavities (3); The negative pressure airflow generated by the negative pressure adsorption component sucks the ash from the flow channel cavity (3), while the air flows through the narrow flow channel cavity (3) at a high speed. The negative pressure airflow rubs against the suction port (6) and the wall surface of the flow channel cavity (3) to generate vibration, so that the descaling components at different positions resonate on the heat exchange tube (1). The multiple semicircular grooves (2) on the heat exchange tube (1) destroy the complete surface where the scale is attached, so that the connection layer formed by the scale on the inner wall of the heat exchange tube (1) is easily destroyed, thereby descaling multiple positions of the heat exchange tube (1).

2. The descaling device of the alkali solution condensation device according to claim 1, characterized in that: The descaling assembly comprises a shell (4), a connecting port (5) arranged on the shell (4), and a plurality of suction ports (6) arranged on the shell (4), wherein gaps are left at the suction ports (6).

3. The descaling device of the alkali solution condensation device according to claim 2, characterized in that: The heat exchange tube (1) is provided with a baffle (7), and the descaling component is mirror-imaged with the baffle (7) as a symmetric plane.

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