Steam heater device

Abstract

The utility model provides a steam heater device which comprises a water tank, and a steam inlet pipe and a water return pipe which are arranged in the water tank, and is characterized in that the steam inlet pipe is arranged in the water return pipe, a sleeve is arranged between the steam inlet pipe and the water return pipe, and steam dissipation holes are formed in the periphery of the pipe wall of the steam inlet pipe. Heat exchange pieces are arranged in the water return pipe, and the heat exchange pieces are in a spiral surrounding shape in the water return pipe. Through the sleeve arrangement mode that the steam inlet pipe is arranged in the water return pipe, steam can be directly released into the water return pipe, makes contact with pretreatment liquid flowing in the water return pipe and then is brought into the water tank, two times of heat exchange between the steam and the pretreatment liquid is completed, the heat exchange efficiency is greatly improved, and the heat exchange efficiency is improved. Meanwhile, the problem that in the prior art, due to the steam negative pressure and section-by-section output, the heating surge phenomenon is formed, and consequently the water tank structure is damaged by vibration is solved.

Description

Technical Field

[0001] The utility model relates to a steam heater device, in particular to a device for directly heating a pre-treatment liquid of a metal plate and strip production line by using steam. Background Art

[0002] In the prior art, in the device for direct steam heating of the pretreatment liquid of the metal sheet and strip production line, the steam inlet pipe is directly inserted into the liquid in the water tank. At the same time, in order to avoid the steam from dissipating when the liquid level in the water tank is low, the steam inlet pipe is usually inserted into the very bottom of the water tank. After the steam is ejected from the inlet pipe, it directly contacts the liquid in the water tank to heat the liquid. The steam condenses into hot water and merges into the water tank, thereby increasing the temperature of the liquid in the water tank and achieving the purpose of heating.

[0003] However, in actual application, since the steam inlet pipeline goes directly to the bottom of the liquid surface, the steam pipeline is directly connected to the external liquid, and the external liquid will flow back into the steam inlet pipeline. When the steam heats the liquid in the water tank, it needs to rely on the pressure of the steam itself to press the liquid in the entire pipe out of the pipeline before heating the liquid. At the moment the liquid in the steam inlet pipeline is pressed out of the pipeline, the steam pressure will also be released, and negative pressure will be instantly generated in the pipeline. The liquid in the water tank will be sucked back into the steam inlet pipeline again. This reciprocating process will cause the liquid in the water tank to surge constantly, and at the same time cause heating surge. The vibration caused by surge will damage the water tank structure.

[0004] At the same time, due to the surging phenomenon of heating, steam enters the pre-treatment liquid in waves, causing uneven temperature of the liquid in the water tank. Utility Model Content

[0005] In order to solve the problems in the above-mentioned prior art that when the steam heating device injects steam into the pre-treatment liquid, surging occurs, which causes the water tank to be easily damaged, loud noise, and uneven heating temperature of the pre-treatment liquid, the utility model provides a steam heater device, including a water tank, and a steam inlet pipe and a return pipe arranged inside the water tank, characterized in that the steam inlet pipe is arranged in the return pipe, and a sleeve is arranged between the two pipes.

[0006] By setting the steam inlet pipe in the casing inside the return pipe, the steam can be directly released into the return pipe, and then brought into the water tank after contacting the pre-treatment liquid flowing in the return pipe, so as to complete the double heat exchange between the steam and the pre-treatment liquid, which greatly improves the thermal efficiency of the prior art of directly inserting the steam into the pre-treatment liquid in the water tank for one heat exchange, and the heat exchange is uniform, avoiding the local temperature difference of the pre-treatment liquid in the water tank. In addition, the steam is directly released in the return pipe through the steam inlet pipe. Due to the limitation of the space of the return pipe, the diffusion caused by the direct release of steam in the water tank is avoided, thereby preventing the occurrence of heat loss.

[0007] Preferably, steam escape holes are arranged around the pipe wall of the steam inlet pipe, and a plug is arranged at the bottom position of the other end of the steam inlet pipe.

[0008] By setting multiple escape holes on the circumference of the pipe wall of the steam inlet pipe, the steam is released from the escape holes around the steam inlet pipe into the return pipe, further increasing the contact area between the steam and the pre-treatment liquid in the return pipe, so that the two can fully contact and fully exchange heat, thereby improving the heat exchange efficiency. A plug is set at the bottom of the steam inlet pipe, and the opening and closing size of the plug can be set according to the amount of steam to ensure that the steam is fully released and relieve the pressure in the steam inlet pipe.

[0009] Preferably, a heat exchange fin is arranged inside the water return pipe, and the heat exchange fin is spirally wound inside the water return pipe.

[0010] The used pre-treatment liquid is transported to the water tank again through the return pipe. By setting a spiral heat exchange plate inside the return pipe, the pre-treatment liquid is guided to descend in a spiral shape along the heat exchange plate in the return pipe. In this process, it can further fully contact with the steam released from the multiple escape holes of the steam inlet pipe, thereby further improving its heat exchange efficiency. After the steam and the pre-treatment liquid are fully contacted in the return pipe, they are directly brought into the water tank by the pre-treatment liquid, and heat exchange is performed again with the pre-treatment liquid in the water tank to complete the secondary heat exchange.

[0011] Preferably, the water return pipe can be arranged below the liquid level of the water tank, or above the liquid level of the water tank.

[0012] In view of the fact that the steam has already undergone a heat exchange with the pretreatment liquid in the return pipe, and the steam has been integrated into the pretreatment liquid, and thus flows into the tank body along with the pretreatment liquid, the return pipe can be inserted below the liquid level of the water tank. Similarly, according to working conditions, when the water level of the water tank is lowered, the end of the return pipe is exposed above the liquid level of the water tank, and the pretreatment liquid directly falls into the water tank, which also does not affect the heat exchange effect of the steam on the pretreatment liquid in the return pipe. Therefore, the limitation of the prior art that the return pipe must be set to the bottom of the water tank to ensure its position below the liquid level of the water tank is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention provides a schematic structural diagram of a steam heater device. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. This description is only used to explain the utility model, but not to limit the utility model.

[0015] like Figure 1 As shown, the pretreatment liquid steam heating device includes a water tank 1, which is filled with pretreatment liquid to be used, and a return pipe 2 is arranged, which is inserted into the water tank 1, and a steam inlet pipe 3 is arranged inside the return pipe 2. The steam inlet pipe 3 and the return pipe 2 are arranged in a sleeve, and a plurality of escape holes 4 are arranged on the circumference of the pipe wall of the steam inlet pipe 3, and a plug 5 is arranged at the bottom port position of the steam inlet pipe 3, and a spirally wrapped heat exchange plate 6 is arranged inside the return pipe 2, and at the same time, it can be ensured that the steam inlet pipe 3 passes through the middle position inside the return pipe 2.

[0016] On the metal strip deep processing production line, the pretreatment liquid is sprayed onto the surface of the metal strip to remove oil and rust from the surface of the strip. The used pretreatment liquid flows into the pretreatment liquid recovery pool, and the return pipe 2 of the steam heating device is connected to the pretreatment liquid recovery pool. When the pretreatment liquid steam heating device is working, the heat source steam is introduced into the steam inlet pipe 3, and the heat source steam is released into the return pipe 2 through the escape hole 4 set on the wall of the steam inlet pipe 3. At the same time, the used pretreatment liquid is introduced into the water tank 1 through the return pipe 2. In this process, the pretreatment liquid passes through the heat exchange plate 6 inside the return pipe 2 and descends in a spiral shape. At this time, it contacts the heat source steam released from the escape hole 4. In this process, the steam directly merges into the pretreatment liquid, forming the first heat exchange between the heat source steam and the pretreatment liquid. At the same time, the pretreatment liquid carries the steam into the water tank 1, and forms a secondary heat exchange with the pretreatment liquid in the water tank 1, so as to achieve the purpose of the heat source steam heating the pretreatment liquid. At the same time, an outlet pipeline is connected to the box 1, and the pretreatment liquid in the box 1 is pumped into the spraying device on the metal sheet production line by a pump to complete the spraying of the pretreatment liquid on the surface of the metal sheet. At the same time, the used pretreatment liquid flows into the return pipe 2 again, contacts with the heat source steam for heat exchange, and flows back to the box 1 through the return pipe 2, thereby completing the circulation heating utilization of the pretreatment liquid.

[0017] The setting of the escape hole 4 refines and disperses the steam and releases it into the return pipe 2, so that it can fully contact with the pre-treatment liquid in the return pipe 2, thereby improving the heat exchange efficiency. At the same time, the setting of the spirally wrapped heat exchange plate 6 in the return pipe 2 can guide the pre-treatment liquid to spirally descend around the pipe wall in the return pipe 2, thereby increasing the running distance and running time in the return pipe 2, further increasing the contact time and area between the steam and the pre-treatment liquid, and further enhancing its heat exchange efficiency.

[0018] In view of the fact that the steam and the pre-treatment liquid have undergone sufficient heat exchange in the return pipe 2, the return pipe 2 can be inserted below the liquid level in the water tank 1, and can also be set above the liquid level without affecting the heat exchange effect between the steam and the pre-treatment liquid. At the same time, a plug 5 is set at the bottom port of the steam inlet pipe 3 to meet the large heat exchange amount. When the amount of heat source steam is large, the opening and closing degree of the plug 5 can be adjusted to ensure that the steam is fully released, avoiding the risk of excessive pressure in the steam inlet pipe 3 due to insufficient release of the escape hole 4.

[0019] The above description is merely an exemplary description of the technical concept of the present invention, and a person skilled in the art of the present invention may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments shown in this specification and the accompanying drawings are not intended to limit the technical concept of the present invention, but are intended to illustrate the present invention, and the scope of the technical concept of the present invention is not limited to these embodiments. The scope of protection of the present invention shall be interpreted by the claims, and all technical concepts within the equivalent scope thereof shall be interpreted as included within the scope of the present invention.

Claims

1. A steam heater device, comprising a water tank, and a steam inlet pipe and a water return pipe arranged inside the water tank, characterized in that The steam inlet pipe is arranged in the water return pipe, and a sleeve is arranged between the two pipes.

2. A steam heater device according to claim 1, characterized in that Steam escape holes are arranged around the pipe wall of the steam inlet pipe, and a plug is arranged at the bottom position of the other end of the steam inlet pipe.

3. A steam heater device according to claim 1, characterized in that A heat exchange plate is arranged inside the water return pipe, and the heat exchange plate is spirally wound inside the water return pipe.

4. A steam heater device according to claim 1, characterized in that The water return pipe can be arranged below the liquid level of the water tank, or above the liquid level of the water tank.

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