Vertical water bath type vaporizer

Abstract

The utility model relates to a vertical water bath type vaporizer which comprises an open type shell, the open type shell is in a vertical cylindrical shape, a U-shaped heat exchange tube bundle and a hearth are arranged in the open type shell side by side left and right, a partition plate is arranged between the U-shaped heat exchange tube bundle and the hearth, and a circulating water pump is arranged outside the open type shell. A circulating water outlet is formed in the hearth side of the open type shell, a circulating water inlet is formed in the heat exchange tube bundle side of the open type shell, a water tank is arranged at the top of the open type shell, the water tank is communicated with the open type shell, and an atmosphere communication port is formed in the top of the water tank. According to the utility model, the open type shell is designed into a vertical cylindrical shape, so that the occupied area can be reduced by more than 50%; the water tank communicated with the open type shell is arranged at the top of the open type shell, a heated surface is prevented from being exposed in air and easily corroded or damaged, and meanwhile, a part of gas phase space is reserved in the water tank and serves as a buffer space of the shell when a tube bundle leaks and a nitrogen sealing space when equipment is shut down.

Description

Technical Field

[0001] The utility model relates to the technical field of vaporizers, in particular to a vertical water bath vaporizer. Background Art

[0002] With the rapid development of the economy, the demand for gas products in the steel and coal chemical industries is increasing continuously, and the liquid vaporization gas supply system in the air separation system has also developed rapidly. The currently widely used liquid vaporization gas supply system mainly consists of a cryogenic liquid storage tank, a liquid booster pump, a vaporizer and a pipe network system. Among them, the vaporizer is one of the key devices. It vaporizes the liquid oxygen or liquid nitrogen stored in the cryogenic liquid storage tank to ensure that the air separation equipment can supply gas externally during emergency shutdown or short-term failure, ensuring the stability of gas supply. For on-site gas production in large air separation plants, a vaporizer is configured as a backup system for emergency or peak shaving. Generally, it is continuously used for several hours to two or three days, with a low usage frequency but is indispensable.

[0003] For example, a Chinese patent with the publication number CN212777954U discloses a water bath vaporizer for fuel gas, which includes an open shell. An internal U-shaped tube heat exchanger is arranged above the interior of the open shell, and a liquid inlet pipe and a gas outlet pipe are arranged on the tube box of the U-shaped tube heat exchanger; a burner is arranged at the front of the open shell, and an explosion-proof door is arranged at the rear. An atmospheric connection pipe is arranged at the top of the open shell, and a circulating water outlet, a circulating water pump and a circulating water inlet are also arranged outside; a corrugated furnace liner, a recirculation chamber, a front smoke chamber, a smoke pipe and a rear smoke chamber are arranged below the interior of the open shell; the high-temperature flue gas of the burner enters the corrugated furnace liner, passes through the recirculation chamber, the front smoke chamber, the smoke pipe and the rear smoke chamber in sequence, exchanges heat with the water in the open shell, and then is discharged from the flue gas outlet. This structure uses oil and gas fuels such as natural gas as the heat source, water as the heat transfer medium, and vaporizes the low-temperature medium in the heat exchange tube. The setting of the circulating water pump makes the temperature field distribution of the water in the shell more uniform, the heat exchange more sufficient, and reduces the thickness of the ice layer on the outer wall of the U-shaped tube heat exchange tube. However, this structure adopts a horizontal cylindrical structure design, which occupies a large area and cannot provide enough space to arrange the water bath vaporizer for some factories with tight land planning. Summary of the Utility Model

[0004] The purpose of the present utility model is to overcome the above deficiencies and provide a vertical water bath vaporizer, which can reduce the floor area by more than 50% compared with a horizontal water bath vaporizer with the same performance.

[0005] The purpose of the present utility model is achieved as follows:

[0006] A vertical water bath vaporizer, comprising an open shell, the open shell being in the shape of a vertical cylinder. Inside the open shell, a U-shaped heat exchange tube bundle and a furnace are arranged side by side from left to right. A partition is provided between the U-shaped heat exchange tube bundle and the furnace. A circulating water pump is provided outside the open shell. A circulating water outlet corresponding to the circulating water pump is arranged on the furnace side of the open shell, and a circulating water inlet corresponding to the circulating water pump is arranged on the heat exchange tube bundle side of the open shell. A water tank is arranged at the top of the open shell, the water tank is communicated with the open shell, and an atmospheric communication port is arranged at the top of the water tank.

[0007] Preferably, a burner, a smoke box and a flue gas outlet are arranged at the bottom of the open shell. The high-temperature flue gas generated by the burner exchanges heat with the water bath inside the open shell through the furnace and the smoke tubes, and finally is discharged from the flue gas outlet through the smoke box.

[0008] Preferably, the internal flue gas flow of the open shell adopts a two-pass design. The furnace adopts a corrugated furnace liner, and the smoke tubes adopt threaded tubes.

[0009] Preferably, there are two circulating water pumps, and the two circulating water pumps are arranged in parallel.

[0010] Preferably, nozzles are distributed at intervals along the length direction of the heat exchange tube bundle at the circulating water inlet.

[0011] Preferably, there are two groups of U-shaped heat exchange tube bundles, and each group of U-shaped heat exchange tube bundles has a separate medium inlet and outlet.

[0012] Preferably, the U-shaped heat exchange tube bundle is connected to the open shell by a flange.

[0013] Preferably, a perforated plate is arranged at the inlet tube sheet of the U-shaped heat exchange tube bundle.

[0014] Preferably, an explosion-proof door is also arranged at the top of the open shell corresponding to the furnace.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The open shell is in the shape of a vertical cylinder. Compared with a horizontal fuel gas water bath vaporizer with the same performance, the floor area can be reduced by more than 50%. A water tank communicated with it is arranged at the top of the open shell to increase the liquid level, avoid the heating surface being easily corroded or damaged when exposed to the air. At the same time, a part of the gas phase space is reserved in the water tank, which is used as the buffer space of the shell when the tube bundle leaks and the nitrogen sealing space when the equipment stops running;

[0017] The internal structure of the shell is optimized. A partition is arranged between the tube bundle and the furnace, and nozzles are arranged along the length direction of the tube bundle. The water bath is forced to circulate through an external circulating water pump, and the tube bundle is transversely washed, strengthening heat transfer and reducing the ice layer on the outer side of the tube bundle;

[0018] Several independent U-shaped heat exchange tube bundles can be arranged inside the shell to meet the process requirements of different media;

[0019] At the inlet tube sheet of the U-shaped heat exchange tube bundle, a perforated plate is provided to reduce the fluctuations of the outlet medium pressure and temperature;

[0020] The detachable tube bundle is adopted, which is convenient for maintenance or replacement;

[0021] The flue gas flow adopts two return paths, the furnace chamber adopts a corrugated furnace lining, and the smoke tubes adopt threaded tubes. While strengthening heat transfer, the flue gas discharge temperature is reasonably controlled at 150°C - 170°C to avoid dew point corrosion of the heating surface by flue gas; the smoke box and the flue gas outlet are located at the bottom of the shell, which is convenient for the discharge of flue gas condensate. The above design can effectively reduce the corrosion of the heating surface and extend the service life of the water bath type vaporizer. Brief Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of a vertical water bath type vaporizer of the present utility model.

[0023] Figure 2 For Figure 1 Top view.

[0024] Wherein:

[0025] U-shaped heat exchange tube bundle 1; open shell 2; water tank 3; atmosphere connection port 4; burner 5; furnace chamber 6; smoke tube 7; smoke box 8; flue gas outlet 9; explosion-proof door 10; circulating water pump 11; partition plate 12; nozzle 13. Detailed Description of the Invention

[0026] Referring to Figure 1 And Figure 2 , the present utility model relates to a vertical water bath type vaporizer, which includes an open shell 2. The open shell 2 is in a vertical cylindrical shape. Inside the open shell 2, a U-shaped heat exchange tube bundle 1, a furnace chamber 6 and a smoke tube 7 are arranged side by side from left to right. A partition plate 12 is arranged between the U-shaped heat exchange tube bundle 1 and the furnace chamber 6. A circulating water pump 11 is arranged outside the open shell 2. A circulating water outlet is arranged on the furnace side of the open shell 2, and a circulating water inlet is arranged on the heat exchange tube bundle side of the open shell 2. Nozzles 13 are distributed at intervals along the length direction of the heat exchange tube bundle at the circulating water inlet. The circulating water pump 11 forces the circulating water bath to flow horizontally across the U-shaped heat exchange tube bundle 1 to strengthen heat transfer and reduce the ice layer on the outer side of the tube bundle. The arrangement of the partition plate 12 can change the flow direction of the circulating water and flow horizontally across the tube bundle to enhance heat transfer.

[0027] A water tank 3 is arranged at the top of the open shell 2. The water tank 3 is communicated with the open shell 2. An atmosphere connection port 4 is arranged at the top of the water tank 3 to ensure that all heating surfaces are completely immersed in the water bath. At the same time, a partial gas phase space is reserved in the water tank as a buffer space for the shell when the tube bundle leaks and a nitrogen sealing space when the equipment stops.

[0028] The bottom of the open shell 2 is provided with a burner 5, a smoke box 8 and a flue gas outlet 9. The burner 5 is arranged at the bottom of the furnace chamber 6. The high-temperature flue gas generated by the burner 5 exchanges heat with the water bath in the open shell 2 through the furnace chamber 6 and the smoke pipes 7, and finally is discharged from the flue gas outlet 9 through the smoke box 8, indirectly heating the medium in the U-shaped heat exchange tube bundle 1.

[0029] There are two circulating water pumps 11, which are arranged in parallel and one is used while the other is in standby to ensure the stable operation of the equipment.

[0030] There are two groups of U-shaped heat exchange tube bundles 1, and each group of U-shaped heat exchange tube bundles 1 is provided with separate medium inlets and outlets to meet the process requirements of different media.

[0031] The U-shaped heat exchange tube bundle 1 and the open shell 2 are connected by a flange, which is detachable. When the tube bundle leaks, it is convenient for maintenance or replacement.

[0032] A perforated plate 14 is arranged at the inlet tube plate of the U-shaped heat exchange tube bundle 1 to ensure that when the flow rate of the low-temperature medium is small, it can enter the heat exchange tubes evenly, reducing the fluctuations of the outlet medium pressure and temperature.

[0033] The internal flue gas flow of the open shell 2 adopts two return paths. The furnace chamber 6 adopts a corrugated furnace liner, and the smoke pipes 7 adopt threaded pipes. While strengthening heat transfer, the flue gas exhaust temperature is reasonably controlled at 150°C - 170°C to avoid dew point corrosion of the heating surface by the flue gas. The smoke box 8 and the flue gas outlet 9 are located at the bottom of the open shell, which is beneficial to the discharge of flue gas condensate water. The above design can effectively reduce the corrosion of the heating surface and extend the service life of the water bath type vaporizer.

[0034] An explosion-proof door 10 is also provided at the top of the open shell 2 corresponding to the furnace chamber 6.

[0035] In addition to the above embodiments, the present invention also includes other implementation manners. All technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present invention.

Claims

1. A vertical water bath vaporizer, characterized in that: It includes an open shell which is in a vertical cylindrical shape. Inside the open shell, a U-shaped heat exchange tube bundle and a furnace are arranged side by side from left to right. A partition is provided between the U-shaped heat exchange tube bundle and the furnace. A circulating water pump is provided outside the open shell. A circulating water outlet corresponding to the circulating water pump is arranged on the furnace side of the open shell, and a circulating water inlet corresponding to the circulating water pump is arranged on the heat exchange tube bundle side of the open shell. A water tank is provided at the top of the open shell, and the water tank is communicated with the open shell. An atmospheric communication port is provided at the top of the water tank.

2. The vertical water-bath vaporizer according to claim 1, wherein: A burner, a smoke box and a flue gas outlet are provided at the bottom of the open shell. The high-temperature flue gas generated by the burner exchanges heat with the water bath inside the open shell through the furnace and the smoke pipes, and finally is discharged from the flue gas outlet through the smoke box.

3. The vertical water bath vaporizer according to claim 2, wherein: The internal flue gas flow of the open shell adopts a two-pass design. The furnace adopts a corrugated furnace lining, and the smoke pipes adopt threaded pipes.

4. The vertical water-bath vaporizer according to claim 1, characterized in that: There are two circulating water pumps, and the two circulating water pumps are arranged in parallel.

5. The vertical water bath vaporizer according to claim 1, wherein: Nozzles are distributed at intervals along the length direction of the heat exchange tube bundle at the circulating water inlet.

6. The vertical water bath vaporizer according to claim 1, wherein: There are two groups of U-shaped heat exchange tube bundles, and each group of U-shaped heat exchange tube bundles has independent medium inlets and outlets.

7. A vertical water-bath vaporizer according to claim 1 or 6, characterized in that: The U-shaped heat exchange tube bundle is connected to the open shell by a flange.

8. The vertical water bath vaporizer according to claim 1, characterized in that: A perforated plate is arranged at the inlet tube sheet of the U-shaped heat exchange tube bundle.

9. The vertical water-bath vaporizer according to claim 1, characterized in that: An explosion-proof door is also provided at the top of the open shell corresponding to the furnace.

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