Vertical stainless steel steam boiler

Abstract

According to the vertical stainless steel steam boiler, the third-stage steam chamber is arranged at the top of the hearth, the steam heating pipe is additionally arranged in the third-stage steam chamber, steam in the third-stage steam chamber can be secondarily heated, meanwhile, liquid water separated from the third-stage steam chamber flows back to the lower water cavity through the condensation water return pipe, and secondary heating circulation is conducted; under the condition that the volume of the steam chamber is not increased, the water content of steam is greatly reduced, the water volume of the boiler is reduced, the heat utilization rate of the boiler is increased, the safety of the boiler is improved, and the manufacturing, mounting and using cost of the boiler is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating equipment, in particular to a vertical stainless steel steam boiler. BACKGROUND

[0002] As a kind of special pressure equipment, water volume is an important parameter affecting the index of steam generator, especially steam boiler, and the safety level of small water volume boiler production, installation and use is low.According to TSG 11-2020 "Special Equipment Safety Technology Specification", boilers below 30 liters do not need to handle use registration, do not implement periodic inspection, and boiler operators do not need to obtain "Special Equipment Operator Certificate".In order to reduce the cost of production, installation and use, and improve the safety of boiler, the pursuit goal of boiler design and manufacture is to reduce the water volume to the maximum extent under the condition of ensuring normal use of boiler, and reducing the water volume will inevitably reduce the volume of steam chamber, but too low steam chamber volume will affect the dryness of water vapor, which cannot meet the requirements of high demand users.Although some manufacturers add water vapor separators to improve the dryness of water vapor, it will increase the cost of equipment, and at the same time, the water separated by the water vapor separator will take away a lot of heat, which will also cause a lot of energy waste. SUMMARY

[0003] One object of the present application is to provide a vertical stainless steel steam boiler to solve the problems in the background art, which can meet the requirements of steam dryness under the condition of low water volume of the boiler.

[0004] According to one object of the present application, the present application provides a vertical stainless steel steam boiler, which comprises a combustion system composed of a combustion rod, a hearth, a steam heating pipe, a flue gas collection chamber, a flue gas outlet hole and a smoke outlet, and a steam generating system composed of a water inlet, a lower water cavity, a finned tube, a primary steam chamber, a secondary steam chamber, a tertiary steam chamber, a condensate return pipe and a steam outlet, wherein the combustion rod is located at the center of the hearth, the lower water cavity is located at the lower part of the hearth, the primary steam chamber, the secondary steam chamber, the tertiary steam chamber and the flue gas collection chamber are located at the upper part of the hearth, the steam heating pipe is located in the tertiary steam chamber, the smoke outlet is located at the upper part of the boiler, the water inlet is connected with the lower water cavity and located at the lower part of the boiler, and the steam outlet is connected with the tertiary steam chamber and located at the top of the boiler.

[0005] Further, the finned tube is uniformly distributed around the boiler axis as the center line, can form one or more circles, and connects the lower water cavity and the primary steam chamber.

[0006] Further, the tertiary steam chamber is located at the top of the hearth.

[0007] Further, the steam heating pipe is located in the tertiary steam chamber and arranged uniformly.

[0008] Further, the condensing backwater pipe is located at the side of the boiler, and connects the third steam chamber and the water cavity.

[0009] Further, the first steam chamber and the second steam chamber are connected in series by the uniformly distributed steam through holes.

[0010] Further, the flue gas collecting chamber is located at the upper part of the third steam chamber and is connected with the hearth through the flue gas outlet hole.

[0011] The technical scheme of the present application provides a vertical stainless steel steam boiler, the third steam chamber is arranged at the top of the hearth, the steam heating pipe is additionally arranged inside, the steam in the third steam chamber can be secondarily heated, the liquid water separated from the third steam chamber flows back to the water cavity through the condensing backwater pipe to be secondarily heated and circulated, the water content of the steam is greatly reduced without increasing the volume of the steam chamber, the water volume of the boiler is reduced, the heat utilization rate of the boiler is improved, the safety of the boiler is improved, and the manufacturing, installation and use costs of the boiler are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present application or the technical scheme in the prior art, the drawings needed to be used in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0013] Figure 1 is a structural schematic view of an embodiment of the present application;

[0014] Figure 2 is an A-A sectional view of Figure 1

[0015] In the figure: 1, steam outlet; 2, smoke exhaust port; 3, hearth; 4, finned tube; 5, combustion rod; 6, water cavity; 7, water inlet; 8, premixed gas; 9, condensing backwater pipe; 10, flue gas; 11, water vapor; 12, first steam chamber; 13, steam through hole; 14, second steam chamber; 15, steam heating pipe; 16, flue gas outlet hole; 17, third steam chamber; 18, flue gas collecting chamber. DETAILED DESCRIPTION

[0016] The technical scheme of the present application will be clearly and completely described below by combining with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0017] ​In the description of the present application, it is to be understood that the terms ″ The orientation or positional relationship indicated by "center", "upper", "lower", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0018] In addition, in the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0019] Embodiment 1

[0020] As Figure 1 shown, a vertical stainless steel steam boiler includes a combustion system composed of a combustion rod 5, a hearth 3, a steam heating pipe 15, a flue gas collecting chamber 18, a flue gas outlet hole 16, and a smoke exhaust port 2, and a steam generating system composed of a water inlet 7, a lower water cavity 6, a finned tube 4, a primary steam chamber 12, a secondary steam chamber 14, a tertiary steam chamber 17, a condensate return pipe 9, and a steam outlet 1. The combustion rod 5 is located at the center of the hearth 3, the lower water cavity 6 is located at the lower part of the hearth 3, the primary steam chamber 12, the secondary steam chamber 14, the tertiary steam chamber 17, and the flue gas collecting chamber 18 are located at the upper part of the hearth, the steam heating pipe 15 is located in the tertiary steam chamber 17, connecting the hearth 3 and the flue gas collecting chamber 18, the smoke exhaust port 2 is located at the upper part of the boiler, the water inlet 7 is located at the lower part of the boiler and connected to the lower water cavity 6, the steam outlet 1 is located at the top of the boiler and connected to the tertiary steam chamber 17, and the condensate return pipe 9 is located at the side of the boiler.

[0021] When the present application is in normal operation, as a combustion system, the premixed gas 8 composed of natural gas and air enters the combustion rod 5 at the bottom of the boiler, ignites and burns on the surface of the combustion rod 5, and the generated heat is conducted to the finned tube 4. Then the high-temperature flue gas 10 flows upwards along the outer wall 19 of the boiler, further heats the water vapor 11 in the steam chambers when flowing through the primary steam chamber 12 and the secondary steam chamber 14, and reduces the water content of the water vapor 11. The flue gas 10 that does not pass through the finned tube 4 flows to the upper part of the furnace, and transfers the heat carried to the water vapor 11 in the tertiary steam chamber 17 when passing through the steam heating pipe 15, further reducing the water content of the water vapor 11. At this time, the flue gas 10 converges in the flue gas collection chamber 18, and finally flows out of the boiler through the flue gas outlet 16 and the flue gas 10 flowing upwards along the outer wall 19 of the boiler. The solid arrows shown by the solid arrows indicate the flow direction of the flue gas 10.

[0022] At the same time, the cold water 20 of a certain pressure flows into the lower water cavity 6 through the water inlet 7 in the steam generating system. Due to the water pressure, the cold water 20 flows upwards along the finned tube 4. At this time, a large amount of heat generated by the premixed gas 8 burning in the combustion rod 5 is fully absorbed by the cold water 20. As the cold water 20 flows upwards, the temperature of the cold water 20 gradually rises until it boils, and the generated steam-water mixture rushes into the primary steam chamber 12. Since the primary steam chamber 12 is provided with steam holes 13, the water flow rushing into the primary steam chamber 12 will be blocked and flow back into the finned tube 4. The water vapor 11 will flow into the secondary steam chamber 14 through the steam holes 13. Since the outer side of the primary steam chamber 12 and the secondary steam chamber 14 is high-temperature flue gas, the water vapor 11 in the steam chamber further absorbs heat, greatly reducing the water content of the water vapor 11, and improving the dryness of the water vapor 11. After the water vapor 11 flows out of the secondary steam chamber 14, it immediately enters the tertiary steam chamber 17. Since the tertiary steam chamber 17 is penetrated by a large number of steam heating pipes 15, the high-temperature flue gas in the heating pipes will further heat the water vapor 11 flowing into the tertiary steam chamber 17, further reducing the water content of the water vapor in the tertiary steam chamber 17. Finally, the water vapor flows out of the boiler through the steam outlet 1. After a long time of operation, the primary steam chamber, the secondary steam chamber and the tertiary steam chamber will separate out some liquid water. Part of the liquid water will be re-vaporized into water vapor by heating with the flue gas 10, and the other part will enter the reflux channel. The liquid water separated by the tertiary steam chamber 17 flows back to the lower water cavity through the condensation backwater pipe 9. The liquid water separated by the secondary steam chamber 14 flows back to the primary steam chamber 12 through the steam holes 13. The liquid water separated by the primary steam chamber 12 flows back to the finned tube 4. The reflux water will enter the next heating cycle. The dashed arrows shown by the dashed arrows indicate the flow direction of the cold water 7 changing into water vapor 11.

[0023] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A vertical stainless steel steam boiler, characterized by, The combustion system comprises a combustion rod, a furnace, a steam heating pipe, a flue gas collecting chamber, a flue gas outlet hole and a smoke outlet, and the steam generating system comprises a water inlet, a water cavity, a finned pipe, a first steam chamber, a second steam chamber, a third steam chamber, a condensing backwater pipe and a steam outlet.

2. A vertical stainless steel steam boiler according to claim 1, characterized in that The finned pipe is evenly distributed along the axis of the boiler and can form one or more circles.

3. A vertical stainless steel steam boiler according to claim 1, characterized in that The first steam chamber and the second steam chamber are connected in series by evenly distributed steam through holes.

4. A vertical stainless steel steam boiler according to claim 1, characterized in that The flue gas collecting chamber is located at the upper part of the third steam chamber and is connected with the furnace through the flue gas outlet hole.

5. A vertical stainless steel steam boiler according to claim 1, characterized in that The condensing backwater pipe is located at the side of the boiler and connects the third steam chamber and the water cavity.

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