A high-voltage electric heater

Abstract

This invention discloses a high-voltage electric heater, comprising: a housing, an inlet, an outlet, and a cavity, the inlet being located at the top of one end of the housing, and the outlet being located at the other end of the housing; a heating element; a support ring, the support ring fixing the heating element to the upper part of the cavity; and a power supply, the power supply being electrically connected to the heating element. Its advantage is that the support ring fixes the heating element to the upper part of the cavity, and when the oil-gas mixture is heated to 366°C, the liquid oil-gas transforms into a gaseous state and floats above the cavity of the heater, while the heating element is located at the upper part of the cavity, heating the gaseous oil-gas and avoiding the phenomenon of having nothing to heat.

Description

Technical Field

[0001] This invention relates to the field of electric heater technology, and in particular to a high-voltage electric heater. Background Technology

[0002] In petrochemicals, oil-gas mixtures need to be heated in electric heaters. The inlet pressure of the heater is as high as 16 MPa, and the temperature of the oil-gas mixture reaches 366°C during heating. Since the oil-gas mixture is a mixture of liquid and gas, as the heater temperature increases, the liquid oil and gas are converted into gas and suspended above the heater cavity, causing the heating element bundle to burn dry or even break apart. Summary of the Invention

[0003] The main objective of this invention is to provide a high-voltage electric heater to solve the problem of dry burning or even cracking of the heating element bundle in the prior art.

[0004] To achieve the above objectives, the present invention provides a high-voltage electric heater, comprising: a housing having an inlet, an outlet, and a cavity, the inlet being located at the top of one end of the housing and the outlet being located at the other end of the housing; a heating element; a support ring fixing the heating element to the cavity; and a power supply electrically connected to the heating element.

[0005] Preferably, a partition plate is provided inside the housing, which divides the cavity into an upper cavity and a lower cavity, and the heating element is located in the upper cavity.

[0006] Preferably, the heating element is U-shaped tubular.

[0007] Preferably, the heating element includes an insulating layer that covers the outer surface of the heating element.

[0008] Preferably, the insulating layer is made of crystalline magnesium oxide powder.

[0009] Preferably, there are at least 100 heating elements, and each heating element is arranged horizontally and evenly in the cavity.

[0010] Preferably, the housing includes an upper body, a lower body, and an outlet, wherein the lower body is planar, the upper body is semi-circular, and the longitudinal section of the outlet is trapezoidal.

[0011] Preferably, the bottom of the cavity is inclined from the outlet.

[0012] Preferably, the bottom of the cavity has an inclination greater than 1 degree towards the outlet.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] 1. A support ring is set to fix the heating element in the upper part of the cavity. When the oil-gas mixture is heated to 366℃, the liquid oil-gas is converted into gas and suspended above the cavity of the heater. The heating element is located in the upper part of the cavity, which heats the gaseous oil-gas, avoiding the problem of having nothing to heat and solving the problem of dry burning.

[0015] 2. Existing heating elements fill the inner cavity, with at least 200 heating elements. By fixing the heating elements to the upper part of the cavity, not only is dry burning not possible, but the number of heating elements is reduced by at least 60.

[0016] 3. Due to the partition plate, when the oil-gas mixture enters the cavity from the inlet, it flows back after being blocked by the partition plate, which increases the heating time of the oil-gas mixture, so that the oil-gas mixture is heated fully and evenly. Under the condition of constant heater power, the oil-gas mixture achieves the same heating effect.

[0017] 4. The insulation layer is made of crystalline magnesium oxide powder, which has heat insulation and fireproofing properties.

[0018] 5. The heating element adopts a U-shaped tubular design, which increases the heating area and improves the heating efficiency of the heater;

[0019] 6. The bottom of the cavity is inclined towards the outlet, which facilitates the removal of impurities from the oil-gas mixture as it flows through the cavity, thus solving the scaling problem caused by impurities lingering in the cavity. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the high-voltage electric heater according to Embodiment 1 of the present invention;

[0022] Figure 2 for Figure 1 The left view;

[0023] Figure 3 This is a schematic diagram of the high-voltage electric heater according to Embodiment 2 of the present invention;

[0024] The above-mentioned figures include the following reference numerals:

[0025] Shell 1, Inlet 11, Outlet 12, Upper cavity 13, Lower cavity 14, Upper main body 15, Lower main body 16, Reflux section 17, Heating element 2, Insulation layer 21, Support ring 3, Power supply 4, Divider plate 5. Detailed Implementation

[0026] This application provides a high-voltage electric heater to solve the problem of dry burning or even cracking of heating element bundles in the prior art.

[0027] The technical solution in this application embodiment is to solve the problem of dry burning or even cracking of the heating element bundle. The overall idea is as follows:

[0028] A support ring is installed to fix the heating element to the upper part of the cavity. When the oil-gas mixture is heated to 366°C, the liquid oil-gas is converted into gas and suspended above the cavity of the heater. The heating element is located at the upper part of the cavity, which heats the gaseous oil-gas, thus avoiding the phenomenon of having nothing to heat.

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0030] like Figure 1 and 2As shown, a high-pressure electric heater, wherein the high pressure refers to the inlet pressure of the heater reaching 16 MPa, includes a shell 1, a heating element 2, a support ring 3, and a power supply 4. The shell 1 is made of INCOLOY 800 and has an inlet 11, an outlet 12, and a cavity. The inlet 11 is located at the top of one end of the shell 1, and the outlet 12 is located at the other end of the shell 1. A partition plate 5 is provided inside the shell 1, which divides the cavity into an upper cavity 13 and a lower cavity 14. The support ring 3 fixes the heating element 2 to the upper cavity 13. The power supply 4 is electrically connected to the heating element 2. The heating element 2 is a U-shaped tube with an outer diameter of Φ12. Its outer surface is covered with an insulating layer 21, which is made of crystalline magnesium oxide powder. In existing technologies, heating elements 2 fill the inner cavity, with at least 200 heating elements 2. However, in this embodiment, because the partition plate 5 divides the cavity into an upper cavity 13 and a lower cavity 14, with the lower cavity 14 being an empty cavity, the heating elements 2 are fixed in the upper cavity 13, saving at least 60 heating elements 2. This embodiment uses 141 heating elements 2, each of which is evenly and parallelly arranged laterally in the upper cavity 13. The heating elements are welded using computer-controlled deep-hole argon arc welding, and the heating elements 2 are deeply welded to the flange using deep-hole welding technology to fix the electric heating tube to the shell 1. Inside the cavity, high-temperature wires are used to connect the heating elements 2 and the terminals. The connection between the lead rod and the resistance wire of the electric heating element 2 is a flexible connection and argon arc welding. The sealing material of the heating elements uses a high-temperature resistant secondary curing insulation sealing method. At the same time, the bends of the heating elements 2 are flattened twice to restore the density of the insulation material. The insulation resistance of a single heating element 2 is not less than 500 megohms. The electric heater in this embodiment is small in size and has a high heating power, and can heat various media in various occasions. The heater is controlled by a DCS system. Example 2

[0031] Figure 3 As shown, a high-pressure electric heater includes a housing 1, a heating element 2, a support ring 3, and a power supply 4. The housing 1 is provided with an inlet 11, an outlet 12, and a cavity. The inlet 11 is located at the top of one end of the housing 1, and the outlet 12 is located at the other end of the housing 1. The housing 1 includes an upper body 15, a lower body 16, and a return section 17. The lower body 16 is planar, and the upper body 15 is semi-circular. The upper body 15 and the lower body 16 are installed by a flange. Various flowing and stationary liquids and gases are heated by forced convection or natural convection. The longitudinal section of the outlet 12 is trapezoidal, and the bottom of the cavity is inclined at a greater than 1 degree towards the outlet 12.

[0032] The working process of the high-pressure electric heater is as follows: the oil-gas mixture or various media enter the cavity through the inlet, the power of the heater is turned on to heat the heating element, the media impacts the separator and generates backflow, the heating element heats the media. Since the heating element is fixed in the upper part of the cavity, when the oil-gas mixture is heated to 366°C, the liquid oil-gas is converted into gas and suspended above the cavity of the heater, and the heating element is in the upper part of the cavity, which continuously heats the gaseous oil-gas. The media flows to the outlet, carrying away the heat.

[0033] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations may be apparent to those skilled in the art. Any modifications, substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-voltage electric heater, characterized in that, include: A housing having an inlet, an outlet, and a cavity, the inlet being located at the top of one end of the housing, and the outlet being located at the other end of the housing; A partition plate is provided inside the housing, which divides the cavity into an upper cavity and a lower cavity. The lower cavity is hollow, and the bottom of the cavity slopes from the outlet. A heating element, wherein the heating element is located within the upper cavity; A support ring, which fixes the heating element to the upper part of the cavity; A power supply, which is electrically connected to the heating element.

2. A high-voltage electric heater according to claim 1, characterized in that, The heating element is U-shaped tubular.

3. A high-voltage electric heater according to claim 2, characterized in that, The heating element includes an insulating layer that covers the outer surface of the heating element.

4. A high-voltage electric heater according to claim 3, characterized in that, The insulating layer is made of crystalline magnesium oxide powder.

5. A high-voltage electric heater according to any one of claims 1 to 4, characterized in that, The heating element comprises at least 100 elements, each of which is arranged horizontally and evenly in parallel within the cavity.

6. A high-voltage electric heater according to any one of claims 1 to 4, characterized in that, The housing includes an upper body, a lower body, and a reflux section. The lower body is planar, the upper body is semi-circular, and the reflux section has a trapezoidal longitudinal section.

7. A high-voltage electric heater according to claim 1, characterized in that, The bottom of the cavity is inclined at an angle greater than 1 degree relative to the outlet direction.

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