In-tank steam heating system

Abstract

The invention relates to the technical field of chemical or metallurgical heating, in particular to an in-tank steam heating system. The in-tank steam heating system comprises a tank body, a ring pipe and a steam inlet pipe. A cover plate is arranged at the upper part of the tank body; an air inlet and an air outlet are formed in the cover plate. And a plurality of first nozzles and a plurality of second nozzles are uniformly arranged in the circumferential direction of the annular pipe. And the first nozzle and the second nozzle are arranged at different angles in the vertical direction. One end of the steam inlet pipe is communicated with an external steam conveying pipeline, and the other end of the steam inlet pipe extends into the tank body from the air inlet and is communicated with the interior of the annular pipe. By means of the arrangement, high-pressure steam sprayed out of the first nozzle and the second nozzle can be sprayed out from different angles in the form of small bubbles, the contact area of the steam and washing water is increased, and therefore the heat exchange efficiency is improved. In addition, in the heating process, vibration and noise are obviously reduced, and the phenomena of equipment damage and personal injury caused by vibration faults of the tank body are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heating in chemical engineering or metallurgy, and particularly to a steam heating system inside a tank. Background Art

[0002] In the field of vanadium chemical production, the trough leaching process of vanadium trioxide (batch leaching with three leaching steps and four washing steps) is one of the core production links. The core lies in soaking and washing roasted clinker with high-temperature hot water (90°C) to extract qualified leaching solution.

[0003] Currently, this process relies on steam to heat the production water in a large water tank. The service life of the large heating water tank is related to the occupational health of operators, and its efficient and stable operation directly determines the key to whether the main production line of the entire trough leaching process can operate normally. However, the existing heating technology has significant defects, seriously restricting production efficiency, equipment safety, and personnel health. The specific technical pain points are as follows: (1) Low heating efficiency: The existing technology uses DN80 / DN50 stainless steel pipes to be vertically inserted into the tank body (in the middle and at the edges) for inclined steam injection. The steam distribution is uneven and the heat exchange is insufficient, resulting in a slow rise in water temperature, delaying the production rhythm of the leaching solution, and large fluctuations in the output of qualified solution. (2) Vibration and noise hazards: The steam is concentrated and ejected in the form of direct-current large-particle bubbles, generating high-frequency mechanical vibrations (amplitude exceeding 0.5 mm) and continuous noise (≥90 dB). This not only accelerates the structural fatigue of the tank body but also causes hearing damage to operators and occupational health risks. (3) Equipment cavitation and structural damage: The unidirectional steam impact causes local cavitation at the bottom / wall of the tank body, increasing the weld cracking rate of the tank wall by 60%, and frequent bottom plate breakdown accidents. At the same time, the vibration is transmitted to the cement foundation, causing foundation pulverization and settlement, further exacerbating the leakage risk. (4) Maintenance cost and safety risk. High-frequency maintenance operations (such as repair welding and replacing the bottom plate) in a confined space are difficult and time-consuming, and the leakage of high-temperature water is likely to cause scalding accidents, increasing the comprehensive maintenance cost by more than 25%.

[0004] Current industry solutions mostly focus on local improvements (such as adding buffer plates or adjusting steam pressure), but fail to systematically solve the problems of uneven steam distribution and energy dissipation. Therefore, there is an urgent need to design an assembled steam ring pipe cross-injection technology. Summary of the Invention

[0005] In view of this, the present invention provides a steam heating system inside a tank, which can at least solve the technical problems of low heating efficiency, high noise, and easy damage caused by vibration in the existing heating device.

[0006] A steam heating system proposed in the present invention comprises: a tank body, a ring pipe and a steam inlet pipe. A cover plate is provided on the upper part of the tank body, and an air inlet and an air outlet are provided on the cover plate. The ring pipe is horizontally arranged inside the tank body and is coaxially arranged with the tank body, and a plurality of first nozzles and a plurality of second nozzles are evenly arranged on the ring pipe along the circumference. The spray direction of the first nozzle forms a first angle relative to the horizontal plane, and the spray direction of the second nozzle forms a second angle relative to the horizontal plane, and the first angle is different from the second angle. One end of the steam inlet pipe is connected to an external steam delivery pipeline, and the other end of the steam inlet pipe extends from the air inlet into the interior of the tank body and is connected to the interior of the ring pipe.

[0007] In some embodiments, the first angle is 0°~5°, the second angle is 30°~60°, the spray direction of the first nozzle is along the horizontal plane or inclined upward relative to the horizontal plane, the spray direction of the second nozzle is inclined upward relative to the horizontal plane, and the spray directions of the first nozzle and the second nozzle are toward the axis of the tank body.

[0008] In some embodiments, the installation position of the first nozzle is located inside the annular tube, and the installation position of the second nozzle is located between the top of the annular tube and the installation position of the first nozzle.

[0009] In some embodiments, the first nozzles and the second nozzles are alternately arranged along the circumference of the annular tube, and the circumferential distance from any first nozzle to two adjacent second nozzles is the same.

[0010] In some embodiments, the annular tube includes multiple pipe sections, each of which is detachable, and the multiple pipe sections are butt-jointed via connecting sleeves.

[0011] In some embodiments, the steam inlet pipe includes a main pipe and multiple branch pipes. The main pipe runs through the air inlet and is located in the middle of the tank body. The multiple branch pipes are connected to the lower end of the main pipe, and the lower end of each branch pipe is connected to the inside of a pipe section of the ring pipe.

[0012] In some embodiments, the steam heating system further comprises a fixed bracket, the fixed bracket is mounted on the bottom of the tank body, and the ring pipe is detachably mounted on the upper portion of the fixed bracket.

[0013] In some embodiments, the inner diameter of the ring formed by the annular tube is 1 / 3 to 2 / 3 of the inner diameter of the tank body.

[0014] In some embodiments, the steam heating system further includes a hot water discharge pump, which is disposed on the outside of the tank body and connected to the tank body for pumping out the hot water in the tank body.

[0015] In some embodiments, an inspection opening is provided at the lower side of the tank body, and a shielding plate is provided at the inspection opening.

[0016] The beneficial effects of the present invention are as follows: By evenly distributing a plurality of first nozzles and second nozzles in the annular pipe, the high-pressure steam ejected from the first nozzles and the second nozzles can be ejected from different angles in the form of small bubbles, increasing the contact area between the steam and the washing water, enabling it to contact the washing water in the tank more evenly and fully, thereby improving the heat exchange efficiency and achieving rapid heating. For example, the heating time is reduced from the original one hour to half an hour. And during the heating process, the vibration and noise are significantly reduced (the noise drops from the original 120 decibels directly to 30 decibels), and the equipment damage and personal injury phenomena caused by the vibration failure of the tank are also significantly reduced, ensuring the stable operation of the large water tank steam heating of the enterprise from a technical perspective. The steam heating tank method adopted in this application can provide a feasible heating system for the enterprise to save energy and reduce consumption, and achieve efficient, stable and safe operation, and has feasible promotion value in the same industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of an in-tank steam heating system provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of an annular pipe of an in-tank steam heating system provided by an embodiment of the present invention; Figure 3 It is a split schematic diagram of an annular pipe of an in-tank steam heating system provided by an embodiment of the present invention; Figure 4 It is a structural cooperation diagram of a pipe section and a connecting sleeve of an in-tank steam heating system provided by an embodiment of the present invention; Figure 5 It is a cross-sectional schematic diagram of a connecting sleeve of an in-tank steam heating system provided by an embodiment of the present invention; Figure 6 It is a distribution diagram of first nozzles and second nozzles on a pipe section of an in-tank steam heating system provided by an embodiment of the present invention; Figure 7 It is a cross-sectional schematic diagram of a first nozzle or a second nozzle of an in-tank steam heating system provided by an embodiment of the present invention.

[0019] Description of the reference numerals: 1. Cover plate; 2. Steam inlet pipe; 201. Main pipe; 202. Branch pipe; 3. Tank body; 4. Ring pipe; 401. Connecting sleeve; 402. Pipe section; 5. Inspection port; 6. Shielding plate; 7. Exhaust pipe; 8. First nozzle; 9. Second nozzle; 10. Fixed bracket; 11. Hot water discharge pump; 12. Convection circuit. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0021] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0022] One embodiment of the present invention provides a steam heating system in a tank, such as Figure 1 As shown, it includes: a tank body 3, a ring pipe 4 and a steam inlet pipe 2. Specifically, the tank body 3 is cylindrical, and its diameter can be 4 meters and its height can be 6 meters. A cover plate 1 is provided on the top of the tank body 3, and an air inlet and an exhaust port are provided on the cover plate 1, wherein the air inlet is used to introduce high-temperature steam into the tank body 3, and the exhaust port is connected to an exhaust pipe 7, which is used to naturally discharge the waste bubbles generated after heating from the exhaust pipe 7. The ring pipe 4 is made of high-temperature resistant material, which is annular. The ring pipe 4 is horizontally arranged inside the tank body 3 and is coaxially arranged with the tank body 3. One end of the steam inlet pipe 2 is connected to the external steam delivery pipeline, and the other end of the steam inlet pipe 2 extends from the air inlet into the tank body 3 and is connected to the inside of the ring pipe 4 to inject high-temperature steam into the ring pipe 4. A plurality of first nozzles 8 and a plurality of second nozzles 9 are evenly arranged on the circumference of the ring tube 4; the spray direction of the first nozzle 8 forms a first angle relative to the horizontal plane, and the spray direction of the second nozzle 9 forms a second angle relative to the horizontal plane, and the first angle is different from the second angle, so that the steam sprayed from the first nozzle 8 and the second nozzle 9 is sprayed at high pressure from different angles in the form of small bubbles. The small steam bubbles sprayed from different angles form a complex fluid flow path in the tank body 3, generating a strong convection phenomenon, which can fully mix the washing water molecules, accelerate the transfer of heat in the washing water, and further improve the heating effect.

[0023] Compared with the prior art, in this application, a plurality of first nozzles 8 and second nozzles 9 are evenly distributed in the loop pipe 4, so that the high-pressure steam ejected from the first nozzles 8 and the second nozzles 9 can be ejected from different angles in the form of small bubbles, increasing the contact area between the steam and the washing water, and enabling it to contact the washing water in the tank body 3 more evenly and fully, thereby improving the heat exchange efficiency and achieving rapid heating. For example, compared with the traditional water tank direct-insert steam pipeline injection heating method and facilities with many disadvantages, the heating time is also reduced from the original 1 hour to half an hour. And during the heating process, not only are the vibration and noise significantly reduced (the noise drops directly from the original 120 decibels to 30 decibels), but also the equipment damage and personal injury phenomena caused by the vibration failure of the tank body 3 are significantly reduced, ensuring the stable operation of the large water tank steam heating of the enterprise from a technical perspective. The steam heating tank body method adopted in this application can provide a feasible heating system for enterprises to save energy and reduce consumption, and achieve efficient, stable and safe operation, and has feasible promotion value in the same industry.

[0024] In some embodiments, as Figure 2 shown, the installation position of the first nozzle 8 is inside the loop pipe 4, the installation position of the second nozzle 9 is between the top of the loop pipe 4 and the installation position of the first nozzle 8, the first angle is 0° to 5°, for example, approximately 0°, and the second angle is 30° to 60°, for example, approximately 45°. The spraying direction of the first nozzle 8 is along the horizontal plane or inclined upward relative to the horizontal plane, the spraying direction of the second nozzle 9 is inclined upward relative to the horizontal plane, and the spraying directions of the first nozzle 8 and the second nozzle 9 are towards the axis of the tank body 3. That is, spraying inward. As Figure 6 shown, the first nozzle 8 is horizontally arranged and faces the axis of the tank body 3; the second nozzle 9 forms an angle of 45° with the horizontal plane. When heating the washing water in the tank body 3, the bubbles generated after the high-temperature and high-pressure steam is split by the first nozzle 8 and the second nozzle 9 can form a convection line 12, and the washing water in the tank body 3 can be heated rapidly and continuously in a circulating manner. And while heating the washing water, the vibration impact and noise of the evenly distributed convection circulating bubbles are significantly reduced. Preferably, as Figure 7 shown, the structures of the first nozzle 8 and the second nozzle 9 are the same, and both are high-pressure nozzles.

[0025] In some embodiments, as Figure 2 shown, the first nozzle 8 and the second nozzle 9 are alternately arranged along the circumferential direction of the loop pipe 4, and the circumferential distance from any first nozzle 8 to the adjacent two second nozzles 9 is the same. In this embodiment, there are 12 first nozzles 8 and 12 second nozzles 9 respectively. The design of the 12 nozzles not only ensures uniform distribution but also optimizes the hydrodynamic characteristics. The number and arrangement of the nozzles can maximize the diffusion area of the steam, reduce dead corners, and enable the washing water in the tank body 3 to reach the required temperature more quickly and evenly.

[0026] In some embodiments, as Figure 1 shown, an inspection opening 5 is provided below the side of the tank body 3, and a shielding plate 6 is provided at the inspection opening 5. Specifically, according to the size of the tank body 3, an inspection opening 5 allowing only one person to pass through is provided on the side of the tank body 3, which is convenient for maintenance personnel to enter the tank body 3 for maintenance. Preferably, the diameter of the inspection opening 5 is 0.5 meters.

[0027] In some embodiments, as Figure 3 shown, the annular pipe 4 is an assembled annular pipe. The annular pipe 4 includes multiple pipe segments 402, such as two, three, or four sections. Each pipe segment 402 is detachable, and the multiple pipe segments 402 are butt-jointed through a connecting sleeve 401. Due to the narrow inspection opening 5 and the large diameter of the annular pipe 4, the annular pipe 4 is designed to be disassembled into multiple sections and enter the tank body 3 through the inspection opening 5, and each pipe segment 402 is connected and assembled together under the connection of the connecting sleeve 401, which is convenient for installation and replacement (as Figure 4 shown). Figure 5 The cross-sectional structure of the connecting sleeve 401 is shown. The connecting sleeve 401 can be a threaded connection type connecting sleeve, a flange connection type connecting sleeve, a clamp connection type connecting sleeve, a ferrule connection type connecting sleeve, etc., so that the multiple pipe segments 402 of the annular pipe 4 can be quickly and hermetically connected, and the installation is convenient.

[0028] In some embodiments, as Figure 1 shown, the steam inlet pipe 2 includes a main pipe 201 and a plurality of shunt pipes 202. The main pipe 201 penetrates through the air inlet, and is located in the middle of the tank body 3. The upper end of the main pipe 201 is communicated with the steam conveying pipeline of an external steam generator, and a plurality of shunt pipes 202 are connected to the lower end of the main pipe 201, and the lower end of each shunt pipe 202 is communicated with the inside of a pipe segment 402 of the annular pipe 4, which is convenient for uniformly introducing steam into each pipe segment 402.

[0029] In some embodiments, as Figure 1 shown, the in-tank steam heating system further includes a fixing bracket 10. The fixing bracket 10 is installed at the bottom of the tank body 3, and the annular pipe 4 is detachably installed on the upper part of the fixing bracket 10. As required, the fixing bracket 10 can be set as a bracket type fixing bracket 10, which is composed of a plurality of brackets and support columns. The brackets are used to support the annular pipe 4, and the support columns are used to fix the brackets at the bottom of the tank body 3. The brackets are fixed to the support columns by welding or bolts, and the support columns are fixed to the bottom of the tank body 3 by anchor bolts.

[0030] In some embodiments, as Figure 1As shown, the inner diameter of the annular shape formed by the annular pipe 4 is 1 / 3 to 2 / 3 of the inner diameter of the tank body 3. Such a dimensional ratio of the annular pipe 4 helps to form a complex fluid flow path inside the tank body 3. When the fluid jets out from the annular pipe 4, a swirl flow and a convection will be generated inside the tank body 3, enabling the washing water to mix more fully with the detergent or steam, thereby improving the washing effect. And the setting of such a ratio can enable the high-temperature and high-pressure steam inside the annular pipe 4 to form a convection line 12 inside the tank body 3 after being shunted through the first nozzle 8 and the second nozzle 9, quickly heating the washing water. When the inner diameter ratio of the annular pipe 4 is appropriate, it can ensure that the steam is more evenly distributed inside the tank body 3, thereby improving the heat conduction efficiency and enabling the washing water to reach the required temperature faster.

[0031] In some embodiments, as Figure 1 shown, the steam heating system further includes a hot water discharge pump 11. The hot water discharge pump 11 is arranged outside the tank body 3 and is connected to the tank body 3 for pumping out the hot water in the tank body 3 and pumping it into each leaching tank for high-temperature washing operations.

[0032] In some embodiments, a temperature sensor (not shown in the figure) is arranged inside the tank body 3 for detecting the temperature of the washing water inside the tank body 3, thereby judging whether the washing water meets the discharge standard. For example, when the temperature sensor detects that its temperature reaches 90 °C, the hot water discharge pump 11 can be started to discharge the heated washing water.

[0033] A heating method of a steam heating system inside a tank proposed in an embodiment of the present invention is as follows: The steam is introduced into the tank body 3 through the main pipe 201 of the steam inlet pipe 2. A large amount of steam flow passes downward through the multiple shunt pipes 202 of the steam inlet pipe 2 and is shunted into the annular pipe 4. The steam flow entering the annular pipe 4 is blown through 12 first nozzles 8 arranged horizontally at 0° and 12 second nozzles 9 arranged obliquely at 45° on the pipe wall of the circular closed-loop annular pipe 4. A large amount of high-temperature and high-pressure steam escapes in the form of small bubbles from different positions to the middle and the upper oblique direction of the annular pipe 4. The bubbles shunted by the first nozzle 8 and the second nozzle 9 continuously circulate along the convection line 12 to quickly heat the washing water inside the tank body 3. The used steam bubbles generated after heating are naturally discharged from the exhaust pipe 7, and the qualified high-temperature washing water is pumped into each leaching tank through the hot water discharge pump 11 below the tank body 3 for high-temperature washing operations.

[0034] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0035] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A steam heating system, characterized in that: include: A tank body (3), wherein a cover plate (1) is provided on the upper part of the tank body (3), and an air inlet and an air outlet are provided on the cover plate (1); an annular tube (4), the annular tube (4) being horizontally arranged inside the tank body (3) and being coaxially arranged with the tank body (3), the annular tube (4) being evenly arranged with a plurality of first nozzles (8) and a plurality of second nozzles (9) along the circumferential direction; the spraying direction of the first nozzles (8) being at a first angle relative to the horizontal plane, the spraying direction of the second nozzles (9) being at a second angle relative to the horizontal plane, the first angle being different from the second angle; A steam inlet pipe (2), one end of which is connected to an external steam delivery pipeline, and the other end of which extends from the air inlet into the interior of the tank body (3) and is connected to the interior of the annular pipe (4).

2. The steam heating system according to claim 1, characterized in that: The first angle is 0° to 5°, the second angle is 30° to 60°, the spraying direction of the first nozzle (8) is along a horizontal plane or is inclined upward relative to the horizontal plane, the spraying direction of the second nozzle (9) is inclined upward relative to the horizontal plane, and the spraying directions of the first nozzle (8) and the second nozzle (9) are toward the axis of the tank body (3).

3. The steam heating system according to claim 1, characterized in that: The installation position of the first nozzle (8) is located inside the annular tube (4), and the installation position of the second nozzle (9) is located between the top of the annular tube (4) and the installation position of the first nozzle (8).

4. The steam heating system according to claim 1, characterized in that: The first nozzles (8) and the second nozzles (9) are alternately arranged along the circumference of the annular tube (4), and the circumferential distance from any first nozzle (8) to two adjacent second nozzles (9) is the same.

5. The steam heating system according to claim 4, characterized in that: The annular pipe (4) comprises a plurality of pipe sections (402), each pipe section (402) is detachable, and the plurality of pipe sections (402) are butt-jointed via a connecting sleeve (401).

6. The steam heating system according to claim 5, characterized in that: The steam inlet pipe (2) comprises a main pipe (201) and a plurality of branch pipes (202); the main pipe (201) passes through the air inlet and is located in the middle of the tank body (3); the plurality of branch pipes (202) are connected to the lower end of the main pipe (201), and the lower end of each branch pipe (202) is in communication with the interior of a pipe section (402) of the ring pipe (4).

7. The steam heating system according to claim 1, characterized in that: It also comprises a fixing bracket (10), wherein the fixing bracket (10) is mounted on the bottom of the tank body (3), and the annular tube (4) is detachably mounted on the upper part of the fixing bracket (10).

8. The steam heating system according to claim 1, characterized in that: The inner diameter of the ring formed by the annular tube (4) is 1 / 3 to 2 / 3 of the inner diameter of the tank body (3).

9. The steam heating system according to claim 1, characterized in that: It also comprises a hot water discharge pump (11), which is arranged outside the tank body (3) and connected to the tank body (3) and is used to pump out the hot water in the tank body (3).

10. The steam heating system according to claim 1, characterized in that: An inspection opening (5) is provided at the lower side of the tank body (3), and a shielding plate (6) is provided at the inspection opening (5).

Images