Steam generator

Abstract

The utility model belongs to the technical field of steam devices, and particularly relates to a steam generator which comprises a combustor and a heat exchanger, the heat exchanger comprises an outer side calandria set and an upper calandria set, the outer side calandria set is in an n shape and is composed of a left calandria set, a right calandria set and a rear calandria set, and the upper calandria set is connected with the combustor. The left tube bank and the right tube bank are communicated through the rear tube bank to form an n-shaped outer tube bank, and the upper tube bank is located in the outer tube bank and communicated with the left tube bank and the right tube bank. The combustor is located at an opening in the front end of the outer side calandria set and sprays flames inwards through the front end of the outer side calandria set, and the flames can make contact with the outer side calandria set and the upper calandria set. The whole heat exchanger is of a surrounding type structure, the front portion, the left rear portion and the upper portion of flame are all surrounded, and therefore heat loss can be effectively avoided. Meanwhile, heat can be absorbed through the structural arrangement of the outer side calandria set, excessive heat is prevented from being transmitted to the heat preservation layer, and the effect of protecting the heat preservation layer can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam devices, and in particular relates to a steam generator. Background Art

[0002] A steam generator, also known as a steam heat source machine or commonly known as a boiler, is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into hot water or steam. This device usually consists of a water tank, electric heating elements, control devices, and safety devices.

[0003] During the operation of the steam generator, water is added to the water tank and the electric heating element converts electrical energy into thermal energy, heating the water to boiling state, thereby generating steam. The steam then enters the application system through the steam outlet to provide the required heat energy.

[0004] Steam generators are widely used in many fields, including food processing, chemical industry, pharmaceutical field, medical care, experimental research, textile printing and dyeing, cleaning and disinfection, etc.

[0005] Some steam generators use gas combustion to heat the heat exchanger to generate steam; however, the existing heat exchanger structure cannot fully absorb heat, causing the heat to easily diffuse around. Although it is possible to achieve heat preservation by setting up insulation cotton to avoid heat dissipation, the heat generated by gas combustion is large, and the insulation cotton cannot withstand long-term high temperatures. Moreover, the steam generated by the existing steam generator has a large water content. Utility Model Content

[0006] In view of the above technical problems, the utility model provides a steam generator, in which a heat exchanger is arranged in an enclosing structure, which can fully absorb heat and prevent the heat from diffusing through the surroundings.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0008] A steam generator comprises a burner and a heat exchanger, wherein the heat exchanger comprises an outer tube group and an upper tube group, wherein the outer tube group is in an "n" shape and consists of a left tube group, a right tube group and a rear tube group, wherein the left tube group and the right tube group are connected through the rear tube group to form an "n"-shaped outer tube group.

[0009] The upper tube group is located inside the outer tube group and is connected to the left tube group and the right tube group; the burner is located at the front end opening of the outer tube group, and the burner sprays flames inward through the front end of the outer tube group, and the flames can contact the outer tube group and the upper tube group;

[0010] The heat exchanger is provided with a water inlet and a steam outlet. Water enters the heat exchanger through the water inlet, and steam generated in the heat exchanger is discharged through the steam outlet.

[0011] The left and right row of pipe groups have the same structure, both comprising an upper transverse tube and a lower transverse tube, wherein the upper transverse tube is connected to the lower transverse tube via a plurality of vertical tubes; the steam port is arranged on the upper transverse tube in the left and / or right row of pipe groups; the water inlet is arranged on the lower transverse tube in the left and / or right row of pipe groups.

[0012] The inner diameters of the upper transverse tube and the lower transverse tube are the same, and the inner diameter of the vertical tube is smaller than the inner diameter of the upper transverse tube.

[0013] The rear pipe group includes an upper connecting pipe and a lower connecting pipe, and the upper connecting pipe and the lower connecting pipe are connected by a plurality of vertical connecting pipes. The two ends of the upper connecting pipe are respectively connected to the upper transverse pipes in the left pipe group and the right pipe group, and the two ends of the lower connecting pipe are respectively connected to the lower transverse pipes in the left pipe group and the right pipe group.

[0014] The inner diameters of the upper connecting pipe and the lower connecting pipe are the same, and the inner diameter of the vertical connecting pipe is larger than the inner diameter of the upper connecting pipe.

[0015] The upper tube group includes a first upper tube group and a second upper tube group, the first upper tube group and the second upper tube group are provided in plurality, and the first upper tube group and the second upper tube group are arranged side by side with an interval between them;

[0016] The first upper tube group and the second upper tube group have the same structure, both comprising an upper steam tube and a lower heating tube, the steam tube and the lower heating tube are connected via a plurality of vertical flue gas heating tubes, the lower heating tube is connected with a circulation tube, and the circulation tube is arranged obliquely;

[0017] The upper steam pipe in the first upper tube group is connected to the upper transverse pipe in the left tube group; the circulation pipe in the first upper tube group is connected to the lower transverse pipe in the right tube group;

[0018] The upper steam pipe in the second upper tube group is connected to the upper transverse pipe in the right tube group; the circulation pipe in the second upper tube group is connected to the lower transverse pipe in the left tube group.

[0019] The outer surface of the vertical flue gas heating pipe is provided with a plurality of spiral grooves; the inner diameters of the upper steam pipe and the lower heating pipe are the same, and the inner diameter of the vertical flue gas heating pipe is larger than the inner diameter of the upper steam pipe.

[0020] The lower horizontal pipe is connected with a sewage pipe.

[0021] The upper row of tubes is located in the upper middle portion of the outer row of tubes.

[0022] It also includes a shell, the heat exchanger is arranged in the shell, and the burner is fixedly connected to the shell; heat insulation cotton is arranged in the shell; and the burner is arranged horizontally.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The left and right tube groups are connected through the rear tube group to form an "n"-shaped outer tube group, and the upper tube group is located inside the outer tube group. That is, the entire heat exchanger forms an enclosed structure, and the front, left rear, and top of the flame are all surrounded, thereby effectively preventing heat loss. At the same time, the structural setting of the outer tube group can absorb heat, prevent excessive heat from being transferred to the insulation layer, and also play a role in protecting the insulation layer.

[0025] The first upper row of tube groups and the second upper row of tube groups are arranged side by side with intervals, and the steam generated by them is finally gathered through the upper connecting pipe. That is, the upper horizontal pipe is a steam pipe, and the steam generated in each row of tube groups must first be gathered into the upper horizontal pipe before it can be discharged; the generated steam is discharged after flowing and converging, and the water vapor in the steam will flow down to each vertically arranged pipe to be heated again. Therefore, the generated steam will not flow out directly, but will flow out after flowing and converging, so that the moisture in the steam will converge in this process and flow down under the action of gravity, thereby effectively reducing the water content of the steam. At the same time, the pipe diameters of each pipeline are set differently, which can form a shrinking structure, so that the flow cross-section is suddenly reduced during the steam flow, and the water droplets contained in the steam or compressed air are separated, thereby further reducing the water content.

[0026] The circulation pipes are arranged obliquely, and the circulation pipes are staggered in a ^ shape to ensure that they can be fully heated by the outer flame of the flame; and the water temperature in the circulation pipe is high and the density is low, while the water temperature in the vertical pipe is low and the density is high, thereby realizing water circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model in one direction;

[0028] Figure 2 It is a schematic diagram of the overall structure of the utility model in another direction;

[0029] Figure 3 It is a schematic diagram of the structure of the heat exchanger of the utility model in one direction;

[0030] Figure 4 It is a schematic structural diagram of the heat exchanger of the utility model in another direction;

[0031] Figure 5 This is a structural schematic diagram of the heat exchanger of the utility model in another direction;

[0032] Figure 6It is a front view of the heat exchanger of the utility model;

[0033] Figure 7 It is a rear view of the heat exchanger of the utility model;

[0034] Figure 8 It is a left side view of the heat exchanger of the utility model;

[0035] Fig. 9 It is a structural schematic diagram of the upper row of pipe groups of the utility model;

[0036] Among them: 1 is a burner, 2 is a heat exchanger, 20 is a left row of pipes, 200 is an upper horizontal pipe, 201 is a lower horizontal pipe, 202 is a vertical pipe, 21 is a right row of pipes, 22 is a rear row of pipes, 220 is an upper connecting pipe, 221 is a lower connecting pipe, 222 is a vertical connecting pipe, 23 is an upper row of pipes, 230 is a first upper row of pipes, 231 is a second upper row of pipes, 24 is an upper steam pipe, 25 is a lower heating pipe, 26 is a vertical flue gas heating pipe, 260 is a spiral groove, 27 is a circulation pipe, 28 is a sewage pipe, 3 is a water inlet, 4 is a steam outlet, 5 is an outer shell, 50 is an air inlet, and 51 is a flue gas outlet. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0038] like Figure 1-9 As shown, a steam generator includes a burner 1 and a heat exchanger 2, wherein the heat exchanger 2 includes an outer tube group and an upper tube group 23, wherein the outer tube group is in an "n" shape and is composed of a left tube group 20, a right tube group 21 and a rear tube group 22, wherein the left tube group 20 and the right tube group 21 are connected through the rear tube group 22 to form an "n"-shaped outer tube group. The left tube group 20, the right tube group 21 and the rear tube group 22 can form a left, right and rear enclosure.

[0039] The upper tube group 23 is located inside the outer tube group and is connected to the left tube group 20 and the right tube group 21 , that is, it can form an upper, left, right and rear surround to fully absorb the heat of the flame.

[0040] The burner 1 is located at the front end opening of the outer tube group. The burner 1 sprays flames inward through the front end of the outer tube group. The flames can contact the outer tube group and the upper tube group 23, thereby heating the water in the outer tube group and the upper tube group 23 to generate steam.

[0041] Specifically, a water inlet 3 and a steam outlet 4 are provided on the heat exchanger 2 , and water enters the heat exchanger 2 through the water inlet 3 ; and steam generated after heating is discharged through the steam outlet 4 .

[0042] Further, the left pipe group 20 and the right pipe group 21 have the same structure, both including an upper transverse pipe 200 and a lower transverse pipe 201, and the upper transverse pipe 200 and the lower transverse pipe 201 are connected through a plurality of vertical pipes 202. The steam port 4 is arranged on the upper transverse pipe 200 in the left pipe group 20 and / or the right pipe group 21, and the water inlet 3 is arranged on the lower transverse pipe 201 in the left pipe group 20 and / or the right pipe group 21; that is, one or two steam ports 4 and water inlets 3 can be arranged, which are arranged according to actual conditions.

[0043] Water enters the lower horizontal pipe 201 and the vertical pipe 202 through the water inlet 3; the upper horizontal pipe 200 is a steam pipe, and the generated steam flows into the steam pipe and is discharged through the steam port 4; the water in the steam flows into the vertical pipe 202 and the lower horizontal pipe 201 under the action of gravity.

[0044] Furthermore, the inner diameters of the upper transverse tube 200 and the lower transverse tube 201 are the same, and the inner diameter of the vertical tube 202 is smaller than the inner diameter of the upper transverse tube 200. This setting of the tube diameters can ensure that the water in the steam can gather at the bottom of the upper transverse tube 200 and flow into the vertical tube 202.

[0045] Furthermore, the rear pipe group 22 includes an upper connecting pipe 220 and a lower connecting pipe 221, and the upper connecting pipe 220 and the lower connecting pipe 221 are connected by a plurality of vertical connecting pipes 222, and the two ends of the upper connecting pipe 220 are respectively connected to the upper transverse pipe 200 in the left pipe group 20 and the right pipe group 21, and the two ends of the lower connecting pipe 221 are respectively connected to the lower transverse pipe 201 in the left pipe group 20 and the right pipe group 21.

[0046] Since both ends of the lower connecting pipe 221 are connected to the lower horizontal pipe 201 in the left and right pipe groups 20 and 21, respectively, water flows into the lower connecting pipe 221 and each vertical connecting pipe 222 through the lower horizontal pipe 201. That is, after water is added, the water level in the vertical connecting pipe 222 is consistent with the water level in the left and right pipe groups 21 (vertical pipe 202). The steam generated in the rear pipe group 22 flows into the upper horizontal pipe 200 through the upper connecting pipe 220, and is finally discharged through the steam port 4 of the upper horizontal pipe 200.

[0047] Furthermore, the inner diameters of the upper connecting pipe 220 and the lower connecting pipe 221 are the same, and the inner diameter of the vertical connecting pipe 222 is larger than the inner diameter of the upper connecting pipe 220. The setting of the pipe diameter forms a constriction structure at the connection point between the vertical connecting pipe 222 and the upper connecting pipe 220, so that the flow cross section is suddenly reduced during the steam flow, and the water droplets contained in the steam or compressed air are separated (flowing down along the vertical connecting pipe 222), thereby further reducing the water content.

[0048] Further, the upper row of tube groups 23 includes a first upper row of tube groups 230 and a second upper row of tube groups 231. There are a plurality of first upper row of tube groups 230 and second upper row of tube groups 231, and the first upper row of tube groups 230 and the second upper row of tube groups 231 are arranged side by side with intervals between them; that is, they are arranged in the manner of first upper row of tube groups 230, second upper row of tube groups 231, first upper row of tube groups 230, second upper row of tube groups 231...

[0049] The first upper tube group 230 and the second upper tube group 231 have the same structure, both including an upper steam pipe 24 and a lower heating pipe 25, the steam pipe and the lower heating pipe 25 are connected through a plurality of vertical flue gas heating pipes 26, the lower heating pipe 25 is connected with a circulation pipe 27, and the circulation pipe 27 is inclined. Water flows into the vertical flue gas heating pipe 26 through the lower horizontal pipe 201, the circulation pipe 27, and the lower heating pipe 25; that is, after water is added, the water levels in the vertical pipe 202, the vertical connecting pipe 222, and the vertical flue gas heating pipe 26 are consistent.

[0050] Specifically, in the first upper tube group 230, the upper steam pipe 24 is connected to the upper transverse pipe 200 in the left tube group 20; the circulation pipe 27 in the first upper tube group 230 is connected to the lower transverse pipe 201 in the right tube group 21. That is, the steam generated in the first tube group is uniformly discharged into the upper transverse pipe 200 in the left tube group 20 through the steam pipe.

[0051] The overall flow direction is water in the lower horizontal pipe 201 (right pipe group 21) → circulation pipe 27 → lower heating pipe 25 → vertical flue gas heating pipe 26 → upper steam pipe 24 → upper horizontal pipe 200 (left pipe group 20).

[0052] In the second upper tube group 231, the upper steam pipe 24 is connected to the upper transverse pipe 200 in the right tube group 21; the circulation pipe 27 in the second upper tube group 231 is connected to the lower transverse pipe 201 in the left tube group 20. That is, the steam generated in the second tube group is uniformly discharged into the upper transverse pipe 200 in the right tube group 21 through the steam pipe.

[0053] The overall flow direction is water in the lower horizontal pipe 201 (left pipe group 20) → circulation pipe 27 → lower heating pipe 25 → vertical flue gas heating pipe 26 → upper steam pipe 24 → upper horizontal pipe 200 (right pipe group 21).

[0054] This structural setting can effectively increase the flow length of the water channel so that it can fully absorb heat; and the steam will not be discharged directly after it is generated, but will change its flow direction and converge, thereby discharging the water suspended in the steam. At the same time, the discharged water can flow back to the heat exchanger 2 to continue heating.

[0055] Furthermore, a plurality of spiral grooves 260 are provided on the outer surface of the vertical flue gas heating pipe 26, and the flue gas can flow along the spiral grooves 260, thereby increasing the contact area with the flue gas and fully absorbing the heat of the flue gas.

[0056] Furthermore, the inner diameters of the upper steam pipe 24 and the lower heating pipe 25 are the same, and the inner diameter of the vertical flue gas heating pipe 26 is larger than the inner diameter of the upper steam pipe 24. That is, the vertical flue gas heating pipe 26 and the upper steam pipe 24 can also form a constriction structure at the connection point, so that the flow cross section is suddenly reduced during the steam flow, and the water droplets (water) contained in the steam or compressed air are separated (flowing down along the vertical flue gas heating pipe 26), thereby further reducing the water content.

[0057] Furthermore, a drain pipe 28 is connected to the lower horizontal pipe 201 ; a valve is provided at the drain pipe 28 , and after long-term operation, the valve can be opened to discharge water in the heat exchanger 2 through the drain pipe 28 .

[0058] Furthermore, the upper tube group 23 is preferably located in the upper middle portion of the outer tube group.

[0059] Furthermore, it also includes a shell 5, the heat exchanger 2 is arranged in the shell 5, and the burner 1 is fixedly connected to the shell 5. The bottom of the shell 5 is provided with an air inlet 50 for supplying air to the burner 1; the top of the shell 5 is provided with a smoke outlet 51, through which the smoke inside can be discharged.

[0060] Furthermore, thermal insulation cotton is arranged inside the outer shell 5 .

[0061] Furthermore, the burner 1 is preferably arranged horizontally, and specifically a methanol burner in the prior art may be used.

[0062] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments.

Claims

1. A steam generator, characterized in that: The invention comprises a burner (1) and a heat exchanger (2), wherein the heat exchanger (2) comprises an outer row of pipes and an upper row of pipes (23), wherein the outer row of pipes is in the shape of an "n" and comprises a left row of pipes (20), a right row of pipes (21) and a rear row of pipes (22), wherein the left row of pipes (20) and the right row of pipes (21) are connected via the rear row of pipes (22) to form an outer row of pipes in the shape of an "n". The upper tube group (23) is located inside the outer tube group and is connected to the left tube group (20) and the right tube group (21); the burner (1) is located at the front end opening of the outer tube group, and the burner (1) sprays flames inward through the front end of the outer tube group, and the flames can contact the outer tube group and the upper tube group (23); The heat exchanger (2) is provided with a water inlet (3) and a steam outlet (4); water enters the heat exchanger (2) through the water inlet (3); and steam generated in the heat exchanger (2) is discharged through the steam outlet (4).

2. A steam generator according to claim 1, characterized in that: The left pipe group (20) and the right pipe group (21) have the same structure, both comprising an upper transverse pipe (200) and a lower transverse pipe (201), wherein the upper transverse pipe (200) and the lower transverse pipe (201) are connected via a plurality of vertical pipes (202); the steam port (4) is arranged on the upper transverse pipe (200) in the left pipe group (20) and / or the right pipe group (21); and the water inlet (3) is arranged on the lower transverse pipe (201) in the left pipe group (20) and / or the right pipe group (21).

3. A steam generator according to claim 2, characterized in that: The upper transverse tube (200) and the lower transverse tube (201) have the same inner diameter, and the inner diameter of the vertical tube (202) is smaller than the inner diameter of the upper transverse tube (200).

4. A steam generator according to claim 2, characterized in that: The rear pipe group (22) comprises an upper connecting pipe (220) and a lower connecting pipe (221); the upper connecting pipe (220) and the lower connecting pipe (221) are connected via a plurality of vertical connecting pipes (222); the two ends of the upper connecting pipe (220) are connected to the upper transverse pipes (200) in the left pipe group (20) and the right pipe group (21), respectively; and the two ends of the lower connecting pipe (221) are connected to the lower transverse pipes (201) in the left pipe group (20) and the right pipe group (21), respectively.

5. A steam generator according to claim 4, characterized in that: The upper connecting tube (220) and the lower connecting tube (221) have the same inner diameter, and the inner diameter of the vertical connecting tube (222) is greater than the inner diameter of the upper connecting tube (220).

6. A steam generator according to claim 2, characterized in that: The upper row of tube groups (23) comprises a first upper row of tube groups (230) and a second upper row of tube groups (231), wherein a plurality of the first upper row of tube groups (230) and the second upper row of tube groups (231) are provided, and the first upper row of tube groups (230) and the second upper row of tube groups (231) are arranged side by side with an interval between them; The first upper tube group (230) and the second upper tube group (231) have the same structure, both comprising an upper steam tube (24) and a lower heating tube (25); the steam tube and the lower heating tube (25) are connected via a plurality of vertical flue gas heating tubes (26); the lower heating tube (25) is connected to a circulation tube (27); and the circulation tube (27) is arranged obliquely; The upper steam pipe (24) in the first upper tube group (230) is connected to the upper transverse pipe (200) in the left tube group (20); the circulation pipe (27) in the first upper tube group (230) is connected to the lower transverse pipe (201) in the right tube group (21); The upper steam pipe (24) in the second upper tube group (231) is connected to the upper transverse pipe (200) in the right tube group (21); and the circulation pipe (27) in the second upper tube group (231) is connected to the lower transverse pipe (201) in the left tube group (20).

7. A steam generator according to claim 6, characterized in that: The outer surface of the vertical flue gas heating pipe (26) is provided with a plurality of spiral grooves (260); the inner diameters of the upper steam pipe (24) and the lower heating pipe (25) are the same, and the inner diameter of the vertical flue gas heating pipe (26) is larger than the inner diameter of the upper steam pipe (24).

8. A steam generator according to claim 2, characterized in that: The lower horizontal pipe (201) is connected to a sewage discharge pipe (28).

9. A steam generator according to claim 1, characterized in that: The upper row of tubes (23) is located in the middle and upper part of the outer row of tubes.

10. A steam generator according to claim 1, characterized in that: It also comprises an outer shell (5), the heat exchanger (2) is arranged in the outer shell (5), and the burner (1) is fixedly connected to the outer shell (5); thermal insulation cotton is arranged in the outer shell (5); and the burner (1) is arranged horizontally.

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