CN220303612U - Spiral heat exchanger of steam generator - Google Patents

Abstract

The utility model discloses a spiral heat exchanger of a steam generator, which comprises a lower fire ring and an upper fire ring which are all in a cylinder shape, wherein the lower fire ring is communicated with the upper fire ring through a plurality of spiral fire tubes which are arranged at intervals on the periphery, and each fire tube consists of an upper spiral section, a lower spiral section and a middle tube section which is connected with the upper spiral section and the lower spiral section. The heat exchanger has the advantages that the heat exchanger has an upper layer type spiral structure and a lower layer type spiral structure, the heat exchange area can be improved in a limited volume, heat energy generated by the burner can be better exchanged with water through the lower spiral section of the fire tube, generated steam reaches the position of the upper spiral section, the generated steam is secondarily heated by the residual heat of the uninverted flue gas, the flue gas finally gathers into the upper fire ring and is heated again through the inner wall of the upper fire ring, finally, the flue gas is discharged through the smoke outlet at the top end, the temperature of the finally discharged steam is higher, and the exhaust gas discharging temperature is lower; the whole spiral heat exchanger is an integral body, and the disassembly and the subsequent cleaning are convenient.

Description

Spiral heat exchanger of steam generator

Technical Field

The utility model belongs to the field of steam generation, and particularly relates to a spiral heat exchanger of a steam generator.

Background

Steam generators, particularly gas-heated steam generators, are commonly used in the food and beverage industry to heat and boil water to generate steam, and output the steam to closed equipment such as a steaming cabinet, a steaming room, a steaming box and the like to cook food by taking the steam as a medium.

Some of the existing steam generators are gas steam generators which directly heat water into steam by heat generated by gas combustion in a water tank through a plate heat exchanger, then directly exhaust the steam, directly exhaust smoke generated by gas combustion or preheat water in a water inlet coil after entering a tail gas tank, and then heat-preserving the steam in a steam outlet coil for further exhaust, and can be particularly seen from waste heat utilization disclosed in Chinese patent No. 214745633U. The existing steam generator has the following defects: the plate heat exchanger has complex production process, too many internal welding points are easy to leak water, and the heat exchange efficiency is low due to small heat exchange area; the water tank and the tail gas tank are respectively arranged, and independent heat exchangers are respectively arranged in the two tanks, so that the structure is complex, and the installation and the maintenance are inconvenient.

Disclosure of Invention

The utility model aims to provide a spiral heat exchanger of a steam generator, and aims to overcome the defects in the prior art.

The technical scheme for solving the technical problems is as follows: the utility model provides a steam generator's spiral heat exchanger, its includes lower firering and last firering that all is the barrel form, lower firering through a plurality of firetubes that set up at the periphery upper interval with go up the firering intercommunication, every the firetube comprises last spiral section, lower spiral section and even pass through go up spiral section and lower spiral section's middle pipeline section, go up spiral section and lie in go up firering periphery and upper end with go up firering inner chamber intercommunication, lower spiral section is located lower firering periphery and lower extreme with lower firering inner chamber intercommunication, lower firering's upper end is sealed and the lower extreme communicates with fuel input pipeline, go up the lower extreme of firering and seal and upper end and exhaust pipe intercommunication.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, the lower end of the upper spiral section is communicated with the inner cavity of the upper fire ring through the lower part of the side wall of the upper fire ring, the upper end of the lower spiral section is communicated with the inner cavity of the lower fire ring through the upper part of the side wall of the lower fire ring, the upper end of the upper spiral section is communicated with the upper end of the middle pipe section, and the lower end of the lower spiral section is communicated with the lower end of the middle pipe section.

Further, the middle pipe section is a straight pipe, and the upper end and the lower end of the middle pipe section are respectively communicated with the upper spiral section and the lower spiral section through spiral fire pipes.

Further, the lower firering is located below the upper firering and the two are vertically spaced apart.

Further, the lower firering and the lower spiral section are positioned in a water containing area at the lower part in the water tank, and the upper firering and the upper spiral section are positioned in a steam area at the upper part in the water tank.

Further, 6-10 fire tubes are arranged at intervals uniformly around the lower fire ring and the upper fire ring.

Further, the upper fire ring and the lower fire ring are both cylindrical in vertical arrangement.

Further, the inner diameters of the upper fire ring and the lower fire ring are the same and are 6-12 times of the inner diameter of the fire tube.

Further, the upper fire ring, the lower fire ring and the fire tube are all made of a fireproof heat-conducting material, and the fireproof heat-conducting material is copper, iron stainless steel or ceramic.

Further, the lower part of the side wall of the lower fire ring is provided with a fire viewing port, the fire viewing port is communicated with one end of a fire viewing pipe, and the other end of the fire viewing pipe is blocked by a glass sheet. The fuel input in the fuel input pipeline is fuel gas mixed with air with a set proportion.

Further, the combustion head is positioned in the middle of the lower fire ring and is vertically upwards.

Compared with the prior art, the utility model has the technical effects and advantages that:

the spiral heat exchanger is provided with an upper fire ring and a lower fire ring which are communicated through a fire tube, the fire tube is provided with an upper spiral section and a lower spiral section which are communicated through a middle tube section, the lower fire ring and the lower spiral section are immersed in water in a water tank to heat water, the upper fire ring and the upper spiral section are positioned above the water surface in the water tank to reheat steam, the heat exchanger is provided with the two-layer structure, the heat exchange area can be improved in a limited volume, the effect of waste heat recovery is achieved, heat energy generated by a burner can be better exchanged with water to reheat generated steam, and the temperature of the finally discharged steam is ensured to be higher; the whole spiral heat exchanger is an integral body, and the disassembly and the subsequent cleaning are convenient.

Drawings

Fig. 1 is an isometric view of a spiral heat exchanger of a steam generator according to the present utility model;

FIG. 2 is a front view of the spiral heat exchanger of FIG. 1;

FIG. 3 is a top view of the spiral heat exchanger of FIG. 1;

FIG. 4 is a left side view of the spiral heat exchanger of FIG. 1;

fig. 5 is an isometric view of a fire tube in the spiral heat exchanger of fig. 1.

In the drawings, the list of components represented by the various numbers is as follows:

1. a fire ring is arranged; 2. a fire ring is arranged; 3. a fire tube; 4. an upper helical section; 5. a lower helical section; 6. a middle pipe section; 7. a smoke exhaust pipe; 8. and a fire observation tube.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, if terms indicating orientations such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are used, the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a specific orientation, be configured and operated in the specific orientation, and thus are not to be construed as limiting the present utility model.

As shown in fig. 1 to 5, the present utility model provides a spiral heat exchanger of a steam generator, which comprises a lower fire ring 1 and an upper fire ring 2 which are all in a cylindrical shape, wherein the lower fire ring 1 is communicated with the upper fire ring 2 through a plurality of fire tubes 3 which are arranged at intervals on the periphery, each fire tube 3 consists of an upper spiral section 4, a lower spiral section 5 and a middle tube section 6 which is communicated with the upper spiral section 4 and the lower spiral section 5, the upper spiral section 4 is positioned on the periphery of the upper fire ring 2, the upper end of the upper spiral section is communicated with the inner cavity of the upper fire ring 2, the lower spiral section 5 is positioned on the periphery of the lower fire ring 1, the lower end of the lower fire ring 1 is communicated with the inner cavity of the lower fire ring 1, the upper end of the lower fire ring 1 is closed, the lower end of the lower fire ring 2 is communicated with a fuel input pipeline, and the upper end of the upper fire ring 2 is closed, and the upper end of the lower fire ring is communicated with a smoke exhaust pipe 7.

The lower fire ring is internally provided with a combustion head for fuel (such as natural gas, atomized fuel oil or alcohols and the like) to spray and burn, flames generated during combustion directly bake the side wall of the lower fire ring, water in an outer water tank of the lower fire ring is directly heated by the side wall of the lower fire ring, meanwhile, part of flames can be flushed into a lower spiral section of a fire tube, so that the lower spiral section is directly baked by internal flames, water in the water tank can be heated, the heat exchange area is large, water in the water tank can be heated and boiled faster to generate steam, high-temperature flue gas generated by combustion enters an upper spiral section through a middle pipe section and finally is converged in the upper fire ring, finally is discharged in a concentrated mode, the upper spiral section and the upper fire ring can reheat the steam at the upper part in the water tank, the steam temperature is improved, meanwhile, waste heat of the high-temperature flue gas is absorbed by the steam, and the discharge temperature of the discharged flue gas is lower.

In one embodiment of the present utility model, as shown in fig. 1 and 2, the lower end of the upper spiral section 4 is communicated with the inner cavity of the upper firering 2 through the lower part of the side wall of the upper firering 2, the upper end of the lower spiral section 5 is communicated with the inner cavity of the lower firering 1 through the upper part of the side wall of the lower firering 1, the upper end of the upper spiral section 4 is communicated with the upper end of the middle pipe section 6, and the lower end of the lower spiral section 5 is communicated with the lower end of the middle pipe section 6.

It should be noted that, the above-mentioned structural design can guarantee to coil the upper screw section and the lower screw section more circles in limited space to effectively increase heat transfer area. When the fuel in the lower fire ring burns, flame and smoke can naturally rush upwards, so that the upper end of the lower spiral section is communicated with the upper part of the side wall of the lower fire ring, which is beneficial to the flame and smoke to rush in and the fuel in the combustion head to burn more fully.

In one embodiment of the present utility model, as shown in fig. 5, the middle pipe section 6 is a straight pipe, and the upper and lower ends of the middle pipe section are respectively communicated with the upper spiral section 4 and the lower spiral section 5 through bends.

It should be noted that all the sections of one fire tube can be formed by winding and processing materials with good heat conduction and high temperature resistance such as the same copper tube or stainless steel tube, and of course, different sections of the same fire tube can also be independent, namely, the same fire tube can be formed by connecting and assembling an upper spiral section, a lower spiral section and a middle section through joints.

In one embodiment of the utility model, as shown in fig. 2, the lower firering 1 is located below the upper firering 2 with the two being vertically spaced apart.

In one embodiment of the utility model, the lower firering 1 and the lower helical section 5 are located in a water containing region in the lower part of the tank, and the upper firering 2 and the upper helical section 4 are located in a steam region in the upper part of the tank.

It will be appreciated that the lower portion of the intermediate pipe section is immersed in the water containing zone and the upper portion extends into the steam zone.

In one embodiment of the utility model, 6-10 fire tubes 3 are arranged at equal intervals on the periphery of the lower fire ring 1 and the upper fire ring 2.

In this case, as shown in fig. 1 to 3, the number of fire tubes is 8, and the fire tubes are circumferentially uniformly spaced around the upper and lower fire rings.

In one embodiment of the present utility model, the upper firering 2 and the lower firering 1 are both vertically arranged cylinders.

It will be appreciated that the upper and lower firearms need not be cylindrical, but may be circular, elliptical, or even polygonal if desired.

In one embodiment of the utility model, the inner diameters of the upper firering 2 and the lower firering 1 are the same and 6-12 times the inner diameter of the firetube 3.

It should be noted that, the upper fire ring and the lower fire ring are the functions of collecting fire and smoke respectively, so the inner diameter of the fire tube is obviously larger than that of the fire tube which plays the role of dispersing and increasing the heat exchange area. In addition, the inner diameters of the upper and lower firerings are not necessarily the same.

In one embodiment of the utility model, the upper firering 2, lower firering 1 and firetube 3 are all made of a refractory and thermally conductive material, which is copper, stainless steel or ceramic.

The materials of the upper burner ring, the lower burner ring and the fire tube are not limited to the above-mentioned refractory heat conductive materials, and materials having good heat conductive effect can be used as long as they can withstand the high temperature effect for a long time.

In one embodiment of the utility model, the lower part of the side wall of the lower fire ring is provided with a fire viewing port, the fire viewing port is communicated with one end of a fire viewing pipe 8, and the other end of the fire viewing pipe 8 is blocked by a glass sheet. The fuel input in the fuel input pipeline is fuel gas mixed with air with a set proportion.

The flame condition generated by the combustion of the fuel at the combustion head in the lower fire ring can be observed through the fire observation pipe, so that whether the fuel is combusted, whether the fuel is sufficiently combusted and the like can be conveniently judged.

According to the utility model, heat energy generated by the burner can be better exchanged with heat generated by the lower spiral section of the fire tube, generated steam reaches the position of the upper spiral section, the generated steam is secondarily heated by residual heat of the smoke which is not exchanged, the smoke finally gathers into the upper fire ring, the steam is heated again by the inner wall of the upper fire ring, and finally the smoke is discharged through the smoke outlet at the top end. In addition, the traditional steam generator in the market is generally provided with a combustion head or a fire grate positioned below the water container (namely positioned outside the heat exchanger), and the fire is isolated from water when scale is generated and falls to the bottom of the water container, so that the water container is burnt by the combustion head at the bottom, and the water container is burnt to generate faults; in the utility model, the combustion head is positioned in the middle position in the lower fire ring and is vertically upwards, so that the problems can be effectively avoided.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims (10)

1. The utility model provides a steam generator's spiral heat exchanger, its characterized in that, including lower fire circle (1) and last fire circle (2) that all are the barrel form, lower fire circle (1) through a plurality of firetube (3) that set up in the periphery upwards interval with go up fire circle (2) intercommunication, every firetube (3) are by last helical segment (4), lower helical segment (5) and intercommunication go up helical segment (4) and lower helical segment (5) middle pipeline section (6) is constituteed, go up helical segment (4) and be located go up fire circle (2) periphery and upper end with go up fire circle (2) inner chamber intercommunication, lower helical segment (5) are located lower fire circle (1) periphery and lower extreme with lower fire circle (1) inner chamber intercommunication, the upper end of lower fire circle (1) is sealed and the lower extreme is communicated with fuel input pipeline, the lower extreme of going up fire circle (2) is sealed and upper end and is discharged fume pipe (7) intercommunication.

2. A spiral heat exchanger of a steam generator according to claim 1, wherein the lower end of the upper spiral section (4) is communicated with the inner cavity of the upper firering (2) through the lower part of the side wall of the upper firering (2), the upper end of the lower spiral section (5) is communicated with the inner cavity of the lower firering (1) through the upper part of the side wall of the lower firering (1), the upper end of the upper spiral section (4) is communicated with the upper end of the middle pipe section (6), and the lower end of the lower spiral section (5) is communicated with the lower end of the middle pipe section (6).

3. A spiral heat exchanger for a steam generator according to claim 2, wherein the intermediate pipe section (6) is a straight pipe and the upper and lower ends are respectively connected to the upper spiral section (4) and the lower spiral section (5) by bends.

4. A spiral heat exchanger of a steam generator according to claim 1, characterized in that the lower firering (1) is located below the upper firering (2) and the two are vertically spaced apart.

5. A spiral heat exchanger for a steam generator according to claim 1, characterized in that the lower burner (1) and the lower spiral section (5) are located in a water-containing zone in the lower part of the tank, and the upper burner (2) and the upper spiral section (4) are located in a steam zone in the upper part of the tank.

6. A spiral heat exchanger of a steam generator according to claim 1, characterized in that the number of fire tubes (3) is 6-10 and evenly spaced around the periphery of the lower and upper fire rings (1, 2).

7. A spiral heat exchanger of a steam generator according to claim 1, characterized in that the upper and lower firerings (2, 1) are both vertically arranged cylinders.

8. A spiral heat exchanger of a steam generator according to claim 7, characterized in that the inner diameters of the upper and lower firerings (2, 1) are the same and 6-12 times the inner diameter of the firetube (3).

9. A spiral heat exchanger of a steam generator according to any one of claims 1 to 8, wherein the upper burner ring (2), the lower burner ring (1) and the burner tube (3) are each made of a refractory heat conducting material, which is copper, iron, stainless steel or ceramic.

10. The spiral heat exchanger of a steam generator according to claim 9, wherein the lower part of the side wall of the lower fire ring is provided with a fire viewing port, the fire viewing port is communicated with one end of a fire viewing pipe (8), and the other end of the fire viewing pipe (8) is plugged by a glass sheet.