CN216619777U - Steam generator - Google Patents

Abstract

The utility model discloses a steam generator, which comprises a shell, a tube box, a tube plate and a U-shaped heat exchange tube bundle, wherein a pass partition plate is arranged in the tube box to separate a heating steam inlet tube and a drain outlet tube on the tube box, a heated water supply inlet tube and a steam outlet tube are arranged on the shell, a water inlet device positioned in the shell is arranged at a heated water supply inlet, a shell fixedly connected with the tube plate is arranged on a section of the U-shaped heat exchange tube bundle close to the drain outlet tube, a baffle plate is arranged in the shell to form a preheating space, heated water is sent into the shell through the water inlet device, and the water inlet device is a siphon device. The shell and the U-shaped heat exchange tube bundle are provided with matched roller slideways, wherein the slideways are connected on the inner wall of the shell, and the rollers are more than two groups which are arranged in parallel at intervals and are connected with the U-shaped heat exchange tube bundle. The utility model has the beneficial effects that: the energy utilization rate is improved, the system investment and the operation cost are reduced, and the maintenance is convenient.

Description

Steam generator

Technical Field

The present invention relates to a steam generator, and more particularly, to a steam generator using steam as a heat source.

Background

Steam generators are important devices in heating systems for generating saturated steam. The conventional evaporator which adopts the large container saturated boiling as the working principle heats steam in a pipe, and heats water outside the pipe by utilizing heat generated by steam condensation to generate saturated steam. In general, the outlet temperature of the hot side is the saturated temperature of the condensed water and is higher than the saturated temperature of the evaporation side outside the tube. The heat supply system often comprises a superheater, heating steam adopted by a hot side enters an evaporator after heat exchange through the superheater, the humidity of the heating steam is increased, and the enthalpy value is reduced along with the humidity, so that the required heating steam quantity can be increased to meet the heat exchange requirement. In order to improve the utilization rate of steam heated by the hot side and reduce the temperature of the outlet of the hot side, the evaporators can be considered to be arranged in parallel in a grading manner, steam condensation is adopted by the hot side of one stage of evaporator as a heat source, the temperature of condensed water at the hot side of the other stage of evaporator is further reduced into supercooled water through heat exchange, and the steam generated by the two evaporators is collected and enters the superheater.

The above conventional systems have disadvantages in that: the evaporator is arranged in a grading way, limited by the evaporation temperature of the shell side, the temperature of the outlet of the hot side can be reduced only within a certain range, the expected requirements of the system can not be completely met, one piece of equipment is added, the manufacturing cost is increased, the occupied area of the equipment is increased, and meanwhile, the system arrangement and control system becomes complicated and is not beneficial to the safe and stable operation of the whole heating system.

SUMMERY OF THE UTILITY MODEL

The steam heater is characterized in that a built-in U-shaped heat exchange tube bundle with a preheating function preheats heated feed water in advance, and can be called as a steam heater with a built-in preheating section.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the steam generator comprises a shell, a tube box, a tube plate and a U-shaped heat exchange tube bundle, wherein a pass partition plate is arranged in the tube box to separate a heating steam inlet tube and a drain outlet tube on the tube box, a heated water supply inlet tube and a heated steam outlet tube are arranged on the shell, a water inlet device positioned in the shell is arranged at a heated water supply inlet, a cladding fixedly connected with the tube plate is arranged on one section of the U-shaped heat exchange tube bundle close to the drain outlet tube to form a preheating space, and heated water is sent into the cladding by the water inlet device.

The water inlet device is a siphon device.

The shell is internally provided with a baffle plate.

The pipe box is provided with a manhole.

The shell is formed by connecting a shell section, an eccentric conical shell and a shell body in sequence, the shell section is connected with a tube plate in a welding mode, and the heated water supply inlet pipe and the water inlet device are arranged at the section of the shell section.

The steam outlet pipe is fixed on the barrel body, and a steam-water separation device is installed at a steam outlet in the barrel body.

One end of the cylinder body far away from the eccentric conical shell is provided with a weir plate.

The shell and the U-shaped heat exchange tube bundle are provided with matched roller slideways, wherein the slideways are connected on the inner wall of the shell, and the rollers are more than two groups which are arranged in parallel at intervals and are connected with the U-shaped heat exchange tube bundle.

The utility model has the beneficial effects that: the supercooling degree of the condensed water at the hot side can be further reduced, the temperature is lower than the saturation temperature of the evaporation side outside the pipe, and the energy utilization rate of the heating steam is further improved. The preheating section is built in, so that the number of equipment is reduced, the system arrangement and control requirements are simplified, and the system investment and the operation cost are reduced. The roller slideway support is arranged between the shell and the tube bundle, so that the assembly is time-saving and labor-saving, the tube bundle is prevented from being scratched and the heat exchange tubes at the tube plates are prevented from being damaged by shearing, and the tube bundle is convenient to draw out when being overhauled.

Drawings

Fig. 1 is a schematic view illustrating a structure of a steam generator according to the present invention.

Fig. 2 is a schematic view of a roller skid provided to the steam generator of fig. 1.

FIG. 3 is a schematic shell side media flow diagram of FIG. 1.

Labeled as: 1-heating steam inlet pipe, 2-pipe box, 3-pipe plate, 4-cylindrical shell, 5-eccentric conical shell, 6-U-shaped heat exchange pipe bundle, 7-cylindrical body, 8-steam outlet pipe, 9-weir plate, 10-supporting plate, 11-baffle plate, 12-cladding, 13-heated feed water inlet pipe, 14-water inlet device, 15-hydrophobic outlet pipe, 16-split partition plate, 17-slideway, 18-roller, 19-steam-water separation device and 20-manhole.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1, 2 and 3, the steam generator of the present invention includes a shell body composed of a shell section 4, an eccentric cone shell 5 and a shell body 7 in sequence, a tube box 2, a tube plate 3, a U-shaped heat exchange tube bundle 6, the tube box 2 and the tube plate 3 are welded, the tube box 2 is provided with a heating steam inlet, a condensation drain outlet, a manhole 20, an exhaust port (the exhaust port is omitted in the figure) and other connection tubes, a split-pass partition 16 is arranged in the tube box 2, and the shell section 4 is provided with a heated feed water inlet. In the steam generator, a water inlet device 14 positioned in a shell is arranged at a heated water supply inlet, and an enclosure 12 fixedly connected with a tube plate 3 is arranged on a section of U-shaped heat exchange tube bundle 6 close to a hydrophobic outlet pipe 15 to form a preheating space. On the shell side, heated feed water is fed into the shell 12 through a water inlet device 14, is preheated in the preheating space and then enters the large space of the shell in the shell, is heated by a medium on the tube side to generate steam, and enters the next-stage equipment through a steam outlet pipe 8. On the tube side, heating steam enters the tube box 2 through the heating steam inlet tube 1, enters the upper half U-shaped heat exchange tube bundle 6 under the action of the pass partition plate 16, exchanges heat with the large evaporation space and the medium of the built-in preheating section, and then drain water is discharged out of the evaporator tube box through the outlet tube 15 and enters the next-stage equipment.

As shown in fig. 1 and 3, the preheating section is defined by the tube plate 3 and the cladding 12, and a plurality of baffles 11 are arranged in the preheating section, so that a relatively independent and small heat exchange space is divided at the bottom of the steam generator. The section is full countercurrent heat exchange, the heat exchange efficiency is high, the heat of heating steam can be fully utilized, the condensed water in the pipe is heated to feed water entering the preheating section of the steam generator, the outlet temperature of the condensed water can be lower than the saturation temperature, and a certain supercooling degree requirement is met.

The preheating section plays a role of a first-stage steam generator in the scheme, one steam generator is reduced compared with the conventional arrangement of two-stage steam generators, the system arrangement and control requirements are simplified, and the system investment and the operation cost are reduced.

The water inlet device 14 is a siphon device, and has the advantages that: the medium entering the preheating section is ensured to be feed water with a certain supercooling degree, and the water in a boiling state at the shell side is prevented from entering the cladding and generating reverse heat transfer.

As shown in fig. 1 and 3, a steam-water separation device 19 is installed at the steam outlet 8 inside the barrel 7 to ensure that outlet steam meets certain dryness requirement, so that the steam generator integrates preheating, evaporation and steam-water separation functions.

As shown in fig. 1 and 3, a manhole 20 is provided on the tube box 2 to facilitate maintenance.

As shown in fig. 1 and 3, one end of the barrel 7 far away from the eccentric conical shell 5 is provided with a weir plate 9 to control the upper limit of the liquid level of the large evaporation space, which has the advantages that: the heater pipe bundle is completely immersed in boiling water, liquid at an outlet can be well separated from steam, and meanwhile, the stability of liquid level measurement can be guaranteed.

Like a conventional steam generator, the upper part of the barrel body 7 can be provided with a shell side air release port, a safety valve, a drain outlet, a liquid level control connecting pipe and the like (the shell side air release port, the safety valve, the drain outlet, the liquid level control connecting pipe are omitted in the figure).

As shown in fig. 2, a roller slideway is arranged between the U-shaped heat exchange tube bundle 6 and the shell, wherein the slideway 17 is connected on the inner wall of the shell, the rollers 18 are more than two groups which are arranged in parallel at intervals and are all connected with the U-shaped heat exchange tube bundle 6, the assembly is time-saving and labor-saving, the tube bundle is prevented from scratching the inner wall of the tube body and shearing and damaging the heat exchange tubes at the tube plate, and the tube bundle is convenient to draw out during maintenance.

It should be noted that the orientation and position of the bottom, upper half, etc. as referred to herein, as well as the orientation and position of the components of the steam generator in the normal use state, will be understood by those skilled in the art.

Claims (8)

1. Steam generator, including casing, pipe case (2), tube sheet (3), U-shaped heat exchanger tube bundle (6), set up in pipe case (2) and divide pass baffle (16) to separate heating steam inlet pipe (1) and hydrophobic outlet pipe (15) on pipe case (2), be provided with on the casing by heating feedwater inlet pipe (13) and steam outlet pipe (8), characterized by: a water inlet device (14) positioned in the shell is arranged at a heated feed water inlet, an enclosure (12) fixedly connected with the tube plate (3) is arranged on a section of U-shaped heat exchange tube bundle (6) close to a hydrophobic outlet pipe (15) to form a preheating space, and heated feed water is sent into the enclosure (12) by the water inlet device (14).

2. The steam generator of claim 1, further comprising: the water inlet device (14) is a siphon device.

3. The steam generator of claim 1, further comprising: a baffle plate (11) is arranged in the enclosure (12).

4. The steam generator of claim 1, wherein: the pipe box (2) is provided with a manhole (20).

5. The steam generator of claim 1, further comprising: the shell is formed by sequentially connecting a shell section (4), an eccentric cone shell (5) and a shell body (7), the shell section (4) is connected with a tube plate (3) in a welding manner, and a heated water supply inlet pipe (13) and a water inlet device (14) are arranged at the section of the shell section (4).

6. The steam generator of claim 5, further comprising: the steam outlet pipe (8) is fixed on the barrel body (7), and a steam-water separation device (19) is arranged at a steam outlet in the barrel body (7).

7. The steam generator of claim 5, further comprising: a weir plate (9) is arranged at one end of the cylinder body (7) far away from the eccentric conical shell (5).

8. The steam generator of any one of claims 1 to 7, further comprising: the shell and the U-shaped heat exchange tube bundle (6) are provided with matched roller slideways, wherein the slideways (17) are connected on the inner wall of the shell, and the rollers (18) are more than two groups which are arranged in parallel at intervals and are connected with the U-shaped heat exchange tube bundle (6).

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