A high-pressure feed water heater

Abstract

The high-pressure feedwater electric heater of the present invention has 8 split-type electric heaters fixed and supported in a framework in 4 layers and 2 columns. The cylinders of the 8 split-type electric heaters are fixedly connected to each other to form an integral heating chamber. The heater core of each split-type electric heater is fixedly welded through a tube sheet to the three-way port at the front end of each cylinder, which can meet the usage requirements of the high-pressure feedwater electric heater. It has a simple and compact structure, a small volume, reduces raw material consumption, lowers cost investment, improves heat exchange efficiency and thermal energy, is convenient for maintenance and repair operations, is safe and reliable, and has good usage effects.

Description

Technical Field

[0001] The present invention relates to a high-pressure feed water heater. Background Art

[0002] After the medium is heated by an electric heating tube in an electric heater, the medium needs to circulate under certain conditions to transfer heat to a heat-using device for heat supply. For example, in a feed water heater with water as the transmission medium, the water as the circulating medium needs to have a sufficiently high pressure to maintain a continuous circulating operation state. The high-pressure water flow has high requirements for the shell of the electric heater and the conveying pipeline. The electric heaters in the prior art cannot meet the use requirements of high-pressure feed water heaters, and have defects such as a complex mechanical support structure, large volume, heavy weight, high raw material consumption, high equipment cost investment, low heat exchange efficiency, inconvenient overhaul and maintenance operations, potential safety hazards, and affecting the use effect. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-pressure feed water heater that can meet the use requirements of high-pressure feed water heaters, has a simple and compact structure, small volume, low cost investment, convenient overhaul and maintenance operations, and is safe and reliable.

[0004] The high-pressure feed water heater of the present invention is characterized in that: it includes 8 split electric heaters, each split electric heater is respectively composed of a horizontal cylinder body and a heater core body fixedly installed in the cylinder body. The 8 split electric heaters are uniformly arranged in a 4-layer and 2-column form. The front ends of the cylinder bodies of the 2 split electric heaters in each layer are hermetically connected by welding through a tee. The rear ends of the cylinder bodies of the first and second split electric heaters in the right column of the 2 columns of split electric heaters are fixedly connected by welding through a semi-circular connecting pipe. The rear ends of the cylinder bodies of the second and third split electric heaters in the left column are fixedly connected by welding through a semi-circular connecting pipe, so that the cylinder bodies of the 8 split electric heaters are interconnected to form an overall heating chamber. The welding structure of the tee, the semi-circular connecting pipe and the cylinder body is: the welding surfaces of the tee, the semi-circular connecting pipe and the cylinder body are respectively inclined surfaces, forming a second double-sided groove, and the groove surface angle is 7°. The roots of the second double-sided groove are respectively provided with 1 / 4 arcs facing away from each other; the rear end of the cylinder body of the lowermost split electric heater in the left column has an open extended section, forming a medium inlet; the rear end of the cylinder body of the uppermost split electric heater in the left column has an open extended section, forming a medium outlet, and is fixedly connected with a safety valve interface, a pressure gauge interface, a thermometer interface and a thermometer interface in sequence from the middle of the cylinder body to the rear through a connecting pipe. The middle of the cylinder body of the lowermost split electric heater in the right column is fixedly connected with a blowdown port through a connecting pipe; the heater core body of each split electric heater is fixedly welded and hermetically connected to the front end of the tee through a tube sheet. The welding structure between the tube sheet and the tee is: the welding surface of the tube sheet and the welding surface of the tee are respectively inclined surfaces, forming a first double-sided groove, and the groove angle is 30°;

[0005] The electric heating tubes of the split-type electric heater are eccentrically arranged;

[0006] The eccentric directions of the electric heating tubes of the left-column split-type electric heater and the right-column split-type electric heater are symmetrically biased towards the inner side;

[0007] The middle part of the cylinder body of the lowermost split-type electric heater in the left column is also fixedly connected to the sewage outlet through a connecting pipe;

[0008] The 8 split-type electric heaters with 4 layers and 2 columns are fixedly supported and limitedly installed by a frame. An outer mounting plate is fixedly installed on the outer surface of the frame, and heat insulation materials are filled in the space between the outer mounting plate and the multiple split-type electric heaters;

[0009] The minimum distance between the outer mounting plate and the split-type electric heater is ≥300 mm, and the heat insulation material is rock wool;

[0010] The root gap of the second double-sided groove is 2.

[0011] For the high-pressure feed water electric heater of the present invention, 8 split-type electric heaters are divided into 4 layers and 2 columns and fixedly supported in the frame. The cylinder bodies of the 8 split-type electric heaters are fixedly connected to each other to form an integral heating chamber, which can meet the use requirements of the high-pressure feed water electric heater, has a simple and compact structure, a small volume, reduces the consumption of raw materials, reduces the cost investment, improves the heat exchange efficiency and heat energy, is convenient for overhaul and maintenance operations, is safe and reliable, and has a good use effect. Description of the Drawings

[0012] Figure 1 is the schematic plan view of the high-pressure feed water electric heater according to the embodiment of the present invention;

[0013] Figure 2 is Figure 1 the left view of

[0014] Figure 3 is Figure 1 the top view of

[0015] Figure 4 is the schematic plan view of the on-site installation position of the high-pressure feed water electric heater according to the embodiment of the present invention;

[0016] Figure 5 is the schematic plan view of the integral structure formed by the cylinder bodies of the high-pressure feed water electric heater according to the embodiment of the present invention being connected to each other;

[0017] Figure 6 is Figure 5 the left view of

[0018] Figure 7 is Figure 5 the top view of

[0019] Figure 8 It is a schematic plan view of the high-pressure feed water heater in the embodiment of the present invention after removing the frame and the outer plate;

[0020] Figure 9 is Figure 8 the left view of;

[0021] Figure 10 is Figure 8 the top view of;

[0022] Figure 11 It is a schematic diagram of the welding structure between the tube sheet and the tee of the high-pressure feed water heater in the embodiment of the present invention;

[0023] Figure 12 It is a schematic diagram of the welding structure between the tee and the cylinder body, and between the semi-circular connecting pipe and the cylinder body of the high-pressure feed water heater in the embodiment of the present invention. Specific embodiments

[0024] As shown in the figure, a high-pressure feed water heater has the overall planning scheme as follows: multiple split-type electric heaters are provided, and the small cavities of the split-type electric heaters are interconnected and combined to form an overall heating cavity, which is convenient for maintaining a high-pressure environment to meet the use requirements of the high-pressure feed water heater, and improve the heat exchange efficiency and energy utilization rate, reduce costs, and have a small volume.

[0025] In this embodiment, 8 split-type electric heaters 2 are provided. Each split-type electric heater is respectively composed of a horizontal cylinder body 22 and a heater core 27 fixedly installed in the cylinder body 22. The junction box only needs to be selected as non-explosion-proof; the 8 split-type electric heaters are uniformly arranged, fixedly supported and limitedly installed in the form of 4 layers and 2 columns through the frame 1, and an outer plate 3 is fixedly installed on the outer surface of the frame 1. Heat insulation materials are filled in the space between the outer plate 3 and the multiple split-type electric heaters 2 to form a heat insulation layer to prevent heat loss and further improve the energy utilization rate; the minimum distance between the outer plate 3 and the split-type electric heater 2 is ≥300 mm, and rock wool is selected as the heat insulation material, which has good heat insulation effect.

[0026] The specific connection structure of the 8 split-type electric heaters 2 is as follows:

[0027] The front ends of the cylinders 22 of the two split electric heaters 2 in each layer are hermetically connected by welding through tees 21. Among the two columns of split electric heaters 2, the rear ends of the cylinders of the first and second split electric heaters in the right column are fixedly connected by welding through a semi-circular connecting pipe 28, and the rear ends of the cylinders of the second and third split electric heaters in the left column are fixedly connected by welding through a semi-circular connecting pipe 28, so that the cylinders 22 of the eight split electric heaters are interconnected to form an integral heating chamber. The welding structures of the tee 21, the semi-circular connecting pipe 28 and the cylinder 22 are as follows: the welding surfaces of the tee 21, the semi-circular connecting pipe 28 and the cylinder 22 are respectively inclined surfaces, forming a second double-sided groove, the groove surface angle of which is 7°, and 1 / 4 arcs facing away from each other are respectively arranged at the roots of the second double-sided groove, and the root gap of the second double-sided groove is 2; a section of open extension section extending to the outside is arranged at the rear end of the cylinder of the lowermost split electric heater in the left column, forming a medium inlet N1; a section of open extension section extending to the outside is provided at the rear end of the cylinder of the uppermost split electric heater in the left column, forming a medium outlet N2, and above the cylinder of the uppermost split electric heater in the left column, a safety valve interface N3, a pressure gauge interface N4, a thermometer interface N6 and a thermometer interface N7 are fixedly connected through connecting pipes in sequence along the direction from the middle of the cylinder to the rear. Two safety valve interfaces N3a and N3b are arranged side by side, which can monitor the pressure in real time, double-monitor the real-time temperature, and are safe and reliable.

[0028] A blowdown port N5 is fixedly connected through a connecting pipe in the middle of the cylinder of the lowermost split electric heater in the right column. To improve the blowdown capacity, blowdown ports are respectively arranged in the middle parts of the cylinders of the two lowermost split electric heaters and are connected through a pipeline to the blowdown port N5.

[0029] The fixed connection structure of the heater core is as follows: the heater cores 27 of each split electric heater 2 are fixedly welded and hermetically connected to the front ends of the tees 21 through tube sheets 29 respectively. The welding structure between the tube sheet 29 and the tee 21 is as follows: the welding surfaces of the tube sheet 29 and the tee 21 are respectively inclined surfaces, forming a first double-sided groove, and the groove angle is 30°.

[0030] The split electric heater needs to pass a hydrostatic test, and the test pressure is 36 MPa.

[0031] Furthermore, the electric heating tubes of the eight split electric heaters 2 are eccentrically arranged. The specific eccentric structure is as follows: the eccentric directions of the electric heating tubes of the split electric heaters in the left column and the right column are symmetrically biased towards the inner side direction, that is, the electric heating tubes of the split electric heaters in the left column are eccentric to the right, and the electric heating tubes of the split electric heaters in the right column are eccentric to the left, which can better improve the heat exchange efficiency and prevent energy waste.

[0032] The high-pressure feed water heater of the present invention has 8 split-type electric heaters, which are fixedly supported in a frame in 4 layers and 2 columns. The cylinders of the 8 split-type electric heaters are fixedly connected to each other to form an integral heating chamber. The structure is simple and compact, with a small volume, reducing the consumption of raw materials, lowering the cost investment, improving the heat exchange efficiency and heat energy, being convenient for overhaul and maintenance operations, being safe and reliable, and having good use effects.

[0033] During on-site installation, a maintenance space needs to be reserved around. Specifically, a 600mm inspection passage needs to be reserved on each of the left and right sides and the rear, and a 5000mm maintenance and inspection area needs to be reserved in the front.

Claims

1. A high-pressure feed water electro-heater, characterized in that: it includes 8 split electro-heaters, each split electro-heater is respectively composed of a horizontal cylinder body and a heater core body fixedly installed in the cylinder body. The 8 split electro-heaters are uniformly arranged in a form of 4 layers and 2 columns. The front ends of the cylinder bodies of the 2 split electro-heaters in each layer are hermetically connected by welding through a tee. The rear ends of the cylinder bodies of the first and second split electro-heaters in the right column of the 2 columns of split electro-heaters are fixedly connected by welding through a semi-circular connecting pipe. The rear ends of the cylinder bodies of the second and third split electro-heaters in the left column are fixedly connected by welding through a semi-circular connecting pipe, so that the cylinder bodies of the 8 split electro-heaters are interconnected to form an integral heating chamber. The welding structures of the tee, the semi-circular connecting pipe and the cylinder body are as follows: the welding surfaces of the tee, the semi-circular connecting pipe and the cylinder body are respectively inclined surfaces, forming a second double-sided groove, the groove surface angle of which is 7°. The roots of the second double-sided groove are respectively provided with 1 / 4 arcs facing away from each other; the rear end of the cylinder body of the lowermost split electro-heater in the left column has an open extension section, forming a medium inlet; the rear end of the cylinder body of the uppermost split electro-heater in the left column has an open extension section, forming a medium outlet, and is fixedly connected with a safety valve interface, a pressure gauge interface, a temperature gauge interface and a thermometer interface in sequence from the middle of the cylinder body backward through a connecting pipe. The middle of the cylinder body of the lowermost split electro-heater in the right column is fixedly connected with a blowdown port through a connecting pipe; the heater core bodies of each split electro-heater are respectively fixedly welded and hermetically connected to the front end of the tee through a tube sheet. The welding structure between the tube sheet and the tee is as follows: the welding surface of the tube sheet and the welding surface of the tee are respectively inclined surfaces, forming a first double-sided groove, the groove angle of which is 30°; the electric heating tubes of the split electro-heaters are eccentrically arranged; the eccentric directions of the electric heating tubes of the split electro-heaters in the left column and the right column are symmetrically biased toward the inner side direction.

2. The high-pressure feed water electro-heater according to claim 1, characterized in that: the middle of the cylinder body of the lowermost split electro-heater in the left column is also fixedly connected to the blowdown port through a connecting pipe.

3. The high-pressure feed water electro-heater according to claim 1 or 2, characterized in that: the 8 split electro-heaters in 4 layers and 2 columns are fixedly supported, limited and installed by a frame. An outer mounting plate is fixedly installed on the outer surface of the frame, and heat-insulating materials are filled in the space between the outer mounting plate and the multiple split electro-heaters.

4. The high-pressure feed water electro-heater according to claim 3, characterized in that: the minimum distance between the outer mounting plate and the split electro-heater is ≥300 mm, and the heat-insulating material is rock wool.

Images