Square tube plate water electric heater

Abstract

The utility model discloses a square tube plate water electric heater, it includes: tank, tube plate, electric heating portion, circulating water heating portion, temperature monitoring portion and safety subassembly, tank includes mutually closed upper tank, middle tank and lower tank, the top of upper tank is provided with NG inlet and NG outlet, the tube plate subassembly extends into the middle tank, and the tube plate subassembly extends into the lower tank. A safety assembly communicated with the middle tank body is arranged below the NG inlet and the NG outlet, the middle tank body is provided with a circulating water heating part and a temperature monitoring part, the circulating water heating part and the temperature monitoring part are both located below the safety assembly, the electric heating part is installed in the lower tank body, the bottom of the lower tank body is connected with a drain outlet, and supporting legs are fixedly arranged at the bottom of the lower tank body. The heating device has the advantages of being reasonable in structure, safe, reliable, rapid in heating and accurate and rapid in temperature adjustment.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, specifically to a square tube plate water heater. Background Technology

[0002] The primary reason natural gas needs to be heated is to improve its efficiency and ease of transportation. At normal temperature and pressure, natural gas is a gaseous fuel; heating it converts it into a liquid state, significantly improving storage and transportation efficiency. Liquid natural gas has a much smaller volume than its gaseous counterpart, making storage and transportation more efficient. Furthermore, heating reduces the viscosity of natural gas, increasing its fluidity and facilitating smoother transport through pipelines.

[0003] In certain specific scenarios, heating natural gas is also necessary. For example, in industrial manufacturing, chemical production, and power generation, high-temperature natural gas is required to provide sufficient energy and power. Heating natural gas can meet the needs of these sectors.

[0004] Heating natural gas can also improve its safety. By heating, certain impurities and moisture in the natural gas can be removed, increasing its purity and thus reducing pollutant emissions during combustion. Furthermore, proper heating can prevent natural gas from freezing or becoming blocked due to excessively low temperatures during transportation and use, ensuring the stable operation of the gas supply system.

[0005] Current technologies for heating natural gas typically employ electric heating. While electric heating offers the advantage of rapid heating, it suffers from slow temperature regulation and significant temperature control errors. Therefore, a heater capable of both rapid heating and precise, rapid temperature control is lacking. Summary of the Invention

[0006] In order to solve the above problems, the purpose of this utility model is to provide a square tube plate water heater that is structurally reasonable, safe and reliable, heats up quickly, and adjusts temperature accurately and quickly.

[0007] According to one aspect of this utility model, a square tube sheet water-electric heater is provided, comprising: a tank, a tube sheet assembly, an electric heating unit, a circulating water heating unit, a temperature monitoring unit, and a safety component. The tank includes an upper tank, a middle tank, and a lower tank that are closed to each other. An NG inlet and an NG outlet are provided at the top of the upper tank. The tube sheet assembly extends into the middle tank. A safety component communicating with the middle tank is provided below the NG inlet and NG outlet. The circulating water heating unit and the temperature monitoring unit are provided on the middle tank, both located below the safety component. The electric heating unit is installed in the lower tank. A drain outlet is connected to the bottom of the lower tank, and support feet are fixedly provided at the bottom of the lower tank. Natural gas flows through the NG inlet and NG outlet. The natural gas is heated by the electric heating unit and the circulating water heating unit through the tube sheet assembly. The temperature monitoring unit facilitates precise control of the heating temperature. The safety component prevents excessive pressure inside the tank.

[0008] In some embodiments, the electric heating unit includes at least four sets of heating elements arranged radially along the lower tank. The multiple sets of heating elements in the electric heating unit facilitate rapid heating of the medium within the middle and lower tanks.

[0009] In some embodiments, the circulating water heating unit includes a circulating water inlet, a circulating water outlet, and an overflow outlet. The circulating water inlet and outlet are located on opposite sides of the outer wall of the intermediate tank. The height of the circulating water inlet is higher than the height of the circulating water outlet, and the overflow outlet is located above the circulating water inlet. The circulating water inlet and outlet facilitate rapid and precise temperature adjustment using circulating water.

[0010] In some embodiments, the temperature monitoring unit includes a temperature sensor port, a temperature variable port, and a temperature gauge port. The temperature gauge port, temperature variable port, and temperature sensor port are arranged sequentially from bottom to top above the circulating water outlet. A temperature sensor is installed inside the temperature sensor port, and a temperature gauge is installed inside the temperature gauge port. The temperature sensor port and temperature gauge port facilitate the detection of the temperature at the upper and lower positions within the intermediate tank, while the temperature variable port facilitates the detection of the temperature at the middle position within the intermediate tank.

[0011] In some embodiments, the safety components include: an installation pipe, a safety valve, a first level gauge, and a second level gauge. The installation pipe communicates with the intermediate tank, and its top extends below the NG inlet. The first and second level gauges are installed on the installation pipe, with the second level gauge positioned above the first level gauge. A safety valve is installed between the first and second level gauges. The first and second level gauges facilitate monitoring of the liquid levels in the intermediate and lower tanks, and the safety valve automatically releases gas generated during heating that causes excessive pressure within the tank.

[0012] In some implementations, a first valve is provided on the overflow outlet and a second valve is provided on the drain outlet.

[0013] In some embodiments, the tube sheet assembly includes a tube sheet, heat exchange tubes, and seals. The tube sheet is connected to an upper tank and an intermediate tank via seals on both sides. Multiple sets of heat exchange tubes are provided and connected to the tube sheet. The heat exchange tubes communicate with the upper tank and extend to the bottom of the intermediate tank, being installed axially along the intermediate tank. Natural gas is heated by passing through the intermediate and lower tanks via the tube sheet and heat exchange tubes.

[0014] In some implementations, lifting lugs are fixedly installed on the top outer side of the upper tank.

[0015] This invention features a reasonable structure, high safety and reliability, rapid heating, and precise and rapid temperature control. The natural gas flows through the NG inlet and outlet, and is heated by an electric heating unit and a circulating water heating unit via a tube sheet assembly. A temperature monitoring unit facilitates precise temperature control, and a safety component prevents excessive pressure within the tank. Multiple electric heating elements in the electric heating unit facilitate rapid heating of the medium in the middle and lower tanks. A circulating water inlet and outlet allow for rapid and precise temperature adjustment using circulating water. Temperature sensors and gauges allow for temperature monitoring at the upper and lower positions within the middle tank, while a temperature variable port allows for monitoring of the temperature at the middle position. A first and second level gauge monitor the liquid levels in the middle and lower tanks, and a safety valve automatically releases gas generated during heating to prevent excessive pressure within the tank. The tube sheet and heat exchange tubes allow natural gas to pass through the middle and lower tanks for heating. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a square tube plate water heater according to the present invention;

[0017] Figure 2 This is a top view of a square tube plate water heater according to the present invention;

[0018] Figure 3 This is a schematic diagram of the safety component of a square tube plate hydroelectric heater according to the present invention. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present invention.

[0020] In the description of this utility model, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the terms according to the specific circumstances.

[0021] like Figure 1 and Figure 2 As shown, the square tube plate water heater of this utility model includes: a tank 1, a tube plate 21 assembly 2, an electric heating part 3, a circulating water heating part 4, a temperature monitoring part 5, and a safety component 6. The tank 1 includes an upper tank 11, a middle tank 12, and a lower tank 13 that are closed to each other. The top of the upper tank 11 is provided with an NG inlet 14 and an NG outlet 15. The tube plate 21 assembly 2 extends into the middle tank 12. The safety component 6, which communicates with the middle tank 12, is provided below the NG inlet 14 and the NG outlet 15. The circulating water heating part 4 and the temperature monitoring part 5 are provided on the middle tank 12. The circulating water heating part 4 and the temperature monitoring part 5 are both located below the safety component 6. The electric heating part 3 is installed in the lower tank 13. The bottom of the lower tank 13 is connected to a drain outlet 9. The bottom of the lower tank 13 is fixedly provided with a support foot 7. The natural gas flows through the NG inlet 14 and NG outlet 15. The natural gas is heated by the electric heating unit 3 and the circulating water heating unit 4 through the tube sheet 21 assembly 2. The temperature monitoring unit 5 facilitates precise control of the heating temperature. The safety component 6 prevents excessive pressure inside the tank 1.

[0022] The tube sheet assembly 21 includes a tube sheet 21, heat exchange tubes 22, and a seal 23. The tube sheet 21 is connected to the upper tank 11 and the middle tank 12 on both sides via the seal 23. Multiple sets of heat exchange tubes 22 are provided and connected to the tube sheet 21. The heat exchange tubes 22 communicate with the upper tank 11 and extend to the bottom of the middle tank 12, installed along the axial direction of the middle tank 12. The tube sheet 21 and heat exchange tubes 22 allow hot air to be heated through the middle tank 12 and the lower tank 13.

[0023] In practice, the upper tank 11 is divided into two sealed areas by a partition and a bottom tube sheet 21. One side of the upper tank 11 is used for natural gas intake, and the other side is used for heated natural gas exhaust. The heat exchange tubes 22 are U-shaped, with one end connected to the tube sheet 21 of the intake space and the other end connected to the tube sheet 21 of the exhaust space. During use, natural gas enters from the NG inlet 14 and flows into the heat exchange tubes 22. After being heated by the circulating water heating section 4 of the middle tank 12 and the electric heating section 3 of the lower tank 13, it flows out to the NG outlet 15, completing the heating of the natural gas.

[0024] The electric heating unit 3 includes at least four heating elements 31 arranged radially along the lower tank 13. The multiple sets of heating elements 31 in the electric heating unit 3 facilitate rapid heating of the media within the middle tank 12 and the lower tank 13.

[0025] The circulating water heating unit 4 includes a circulating water inlet 41, a circulating water outlet 42, and an overflow outlet 43. The circulating water inlet 41 and the circulating water outlet 42 are located on both sides of the outer wall of the intermediate tank 12. The height of the circulating water inlet 41 is higher than the height of the circulating water outlet 42, and the overflow outlet 43 is located above the circulating water inlet 41. The circulating water inlet 41 and the circulating water outlet 42 facilitate rapid and precise temperature adjustment using circulating water.

[0026] The temperature monitoring unit 5 includes a temperature sensor port 51, a temperature variable port 52, and a temperature gauge port 53. The temperature gauge port 53, temperature variable port 52, and temperature sensor port 51 are arranged sequentially from bottom to top above the circulating water outlet 42. A temperature sensor is installed in the temperature sensor port 51, and a temperature gauge is installed in the temperature gauge port 53. The temperature sensor port 51 and temperature gauge port 53 facilitate the detection of the temperature at the upper and lower positions within the intermediate tank 12, while the temperature variable port 52 facilitates the detection of the temperature at the middle position within the intermediate tank 12. A thermometer also needs to be installed in the temperature variable port 52. Since the medium heated by the heating element 31 heats up rapidly, but the temperature is higher near the heating element 31 and lower further away, the temperature inside the intermediate tank 12 can be quickly regulated by introducing water through the circulating water inlet 41 above the intermediate tank 12, which drives the flow of the heat exchange medium within the intermediate tank 12. Thus, the temperature of the heat exchange medium at various locations within the intermediate tank 12 is accurately fed back through the temperature sensor port 51, the temperature change port 52, and the temperature gauge port 53.

[0027] like Figure 3 As shown, safety component 6 includes: an installation pipe 61, a safety valve 62, a first level gauge 63, and a second level gauge 64. The installation pipe 61 is connected to the intermediate tank 12, and its top extends below the NG inlet 14. The first level gauge 63 and the second level gauge 64 are installed on the installation pipe 61, with the second level gauge 64 positioned above the first level gauge 63. The safety valve 62 is installed between the first level gauge 63 and the second level gauge 64. The first level gauge 63 and the second level gauge 64 facilitate monitoring of the liquid levels in the intermediate tank 12 and the lower tank 13. The safety valve 62 automatically releases gas generated during heating that causes excessive pressure inside the tank 1. The pressure of the safety valve 62 needs to be set according to the installation design parameters. An automatic vent valve is also installed at the top of the installation pipe 61.

[0028] A first valve 44 is installed on the overflow port 43, and a second valve 91 is installed on the drain port 9. The overflow port 43 facilitates the discharge of liquid, while the drain port 9 facilitates the discharge of impurities that have settled due to heating.

[0029] Lifting lugs 8 are fixedly installed on the top outer side of the upper tank body 11. The lifting lugs 8 facilitate the transportation and lifting of this utility model.

[0030] During processing, the following should be noted: The Class B welded joints between the pipe with a nominal diameter <250mm and the necked weld neck flange shall be subject to 100% MT testing in accordance with the requirements of NB / T47013.4-2015, and shall be qualified at Level I.

[0031] After installation, this utility model should be electrostatic grounded, and the grounding resistance should not be greater than 1 ohm.

[0032] After the water pressure test, use dry air to blow away the moisture and impurities in the pipe cavity, and then wrap and seal the inlet and outlet of the pipe.

[0033] All butt welds and fillet welds must be full penetration welds, and the weld surface should be smoothly transitioned to the base metal, free from defects such as cracks, porosity, slag inclusions and undercut.

[0034] Bolt holes should be aligned with the mid-span of the corresponding axis. All pipes must be degreased, and the surface grease residue rate of oil-sensitive parts should be <125mg / m. 2 ;

[0035] 16Mn forgings must meet the requirements of NB / T47008-2017 "Carbon steel and alloy steel forgings for low-temperature pressure equipment" and undergo low-temperature impact testing at -20℃ with a KV≥41. One sample is allowed to be lower than 41, but not less than 29J.

[0036] The screw base of 35CrMOA shall be subjected to impact at -10℃ in accordance with the provisions of GB / T150.2-2014, section 7.1.4. The impact energy requirement is that a single sample may be lower than 41 J, but shall not be less than 29 J.

[0037] 16MnDR plates shall meet the requirements of GB / T 3531-2014 "Steel Plates for Low Temperature Pressure Vessels", with an impact test temperature of -40℃ and an impact absorbed energy (KV2) / U>47. A single value of a specimen is allowed to be lower than the specified value, but shall not be less than 70% of the specified value.

[0038] Hot water circulation rate: 10.5T / H (adjusted according to actual working conditions), supply and return water temperature 80 / 60℃; the gas-free standard should meet the requirements of GB17820-2018 "Gas-free", H2S content +20mg / m³, and there is no H2S stress corrosion.

[0039] After the shell-side hydrostatic test is passed, an air leakage test shall also be conducted in accordance with the relevant provisions of Appendix HG / T20584-2020.

[0040] This equipment shall be inspected periodically in accordance with the requirements of SG2-2016. If the corrosion rate reaches the specified value prematurely during use, the equipment should be stopped immediately.

[0041] Stainless steel surfaces should be cleaned of oil and subjected to pickling and passivation treatment. Carbon steel and low-alloy copper surfaces should be thoroughly sandblasted to remove rust. Rust removal should meet the requirements of Sa2.5 in GB / T892, with a color code of RAL7O5.17. The welded joint between heat exchanger tube 22 and tube sheet 21 should also undergo 100% penetrant testing and meet the Class I qualification requirements specified in NB / T47013.5-2015.

[0042] When the equipment uses circulating water as a heat source, it is advisable to remove the four electric heating tubes 31. When the equipment uses an electric heater, the first valve 44 of the overflow port 43 should be opened first to connect it with the external environment. At the same time, the liquid level in the liquid level gauge should be observed to avoid the electric heating tubes 31 from burning dry and causing a safety accident.

[0043] The above descriptions are merely some embodiments of this utility model. It should be noted that those skilled in the art can make other modifications and improvements without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A square tube plate water electric heater, characterized by, include: The system comprises a tank body, a tube sheet assembly, an electric heating unit, a circulating water heating unit, a temperature monitoring unit, and a safety component. The tank body consists of an upper tank, a middle tank, and a lower tank that are closed to each other. The top of the upper tank body is provided with an NG inlet and an NG outlet. The tube sheet assembly extends into the middle tank body. Below the NG inlet and NG outlet, a safety component communicating with the middle tank body is provided. The middle tank body is provided with a circulating water heating unit and a temperature monitoring unit, both located below the safety component. The electric heating unit is installed in the lower tank body. The bottom of the lower tank body is connected to a drain outlet, and a support foot is fixedly provided at the bottom of the lower tank body.

2. A square tube plate water electric heater according to claim 1, characterized in that, The electric heating section includes at least four sets of electric heating tubes, which are arranged radially along the lower tank.

3. A square tube plate water electric heater according to claim 2, characterized in that, The circulating water heating unit includes a circulating water inlet, a circulating water outlet, and an overflow outlet. The circulating water inlet and the circulating water outlet are located on both sides of the outer wall of the middle tank. The height of the circulating water inlet is higher than the height of the circulating water outlet, and the overflow outlet is located above the circulating water inlet.

4. A square tube plate water electric heater according to claim 3, characterized in that, The temperature monitoring unit includes a temperature sensor port, a temperature variable port, and a temperature gauge port. The temperature gauge port, the temperature variable port, and the temperature sensor port are arranged sequentially from bottom to top above the circulating water outlet. A temperature sensor is installed in the temperature sensor port, and a temperature gauge is installed in the temperature gauge port.

5. A square tube plate water electric heater according to any one of claims 1-4, characterized in that, The safety components include: an installation pipe, a safety valve, a first level gauge, and a second level gauge. The installation pipe is connected to the intermediate tank body, and the top of the installation pipe extends below the NG inlet. The first level gauge and the second level gauge are installed on the installation pipe, with the second level gauge located above the first level gauge. A safety valve is installed between the first level gauge and the second level gauge.

6. A square tube plate water electric heater according to claim 4, characterized in that, A first valve is installed on the overflow port, and a second valve is installed on the sewage outlet.

7. A square tube plate water electric heater according to claim 6, characterized in that, The tube sheet assembly includes a tube sheet, heat exchange tubes, and seals. The two sides of the tube sheet are connected to the upper tank and the middle tank through the seals. Multiple sets of heat exchange tubes are provided and connected to the tube sheet. The heat exchange tubes are in communication with the upper tank and extend to the bottom of the middle tank and are installed along the axial direction of the middle tank.

8. A square tube plate water electric heater according to claim 7, characterized in that, Lifting lugs are fixedly installed on the top outer side of the upper tank.

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