Natural gas steam boiler

Abstract

A natural gas steam boiler comprises a combustion chamber and a cylindrical body arranged above the combustion chamber, a natural gas burner is arranged on one side of the combustion chamber, the interior of the body is communicated with the top of the combustion chamber through a center opening of a lower cavity, the top of the body is sealed through the bottom of an upper cavity, and a plurality of heat exchange pipes are arranged around the axis center of the body. Wherein the outermost circle of heat exchange pipes and the circle of heat exchange pipes adjacent to the outermost circle of heat exchange pipes are fixedly connected through membrane walls, an annular bottom smoke outlet is reserved below the membrane wall of the outermost circle, an annular top smoke opening is reserved in the top of the membrane wall on the inner side, a smoke exhaust pipe is arranged on one side of the top of the outer portion of the body, and a smoke outlet is formed in one side of the top of the outer portion of the body. A steam outlet is formed in the top of the upper cavity, and a water adding opening is formed in one side of the lower cavity. Natural gas burns in the independent combustion chamber, a vertically roundabout flue gas channel is formed through the membrane type wall, and the heat exchange efficiency of the heat exchange tube is improved through multiple times of heat transfer and multiple times of flue gas steering.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam boiler, in particular to a natural gas steam boiler. BACKGROUND

[0002] The steam boiler is a mechanical device which uses the heat energy of fuel or other energy to heat water into steam, and it is mainly used to convert the chemical energy of fuel into heat energy, and then transfer the heat energy to water in the boiler to heat the water into steam, and is widely used in various industries. According to the fuel classification, the steam boiler can be divided into electromagnetic steam boilers, electric steam boilers, fuel oil steam boilers, gas steam boilers and the like.

[0003] However, the current steam boiler has the following shortcomings:

[0004] 1. The boiler has a large water capacity, slow start and poor running flexibility;

[0005] 2. The installation is complex, the land occupation is large, and the initial investment is high;

[0006] 3. It needs strict safety management and high maintenance cost;

[0007] 4. The heat exchange structure design is unreasonable, and the heat energy cannot be effectively utilized.

[0008] 5. The installation needs to be installed and informed, and the use needs to be inspected annually, which is very troublesome. CONTENT OF THE UTILITY MODEL

[0009] In order to solve the above problems, the purpose of the utility model is to provide a natural gas steam boiler.

[0010] In order to achieve the above purpose, the technical scheme of the utility model is as follows: a natural gas steam boiler, comprising a combustion chamber and a cylindrical body arranged above the combustion chamber, a natural gas burner is arranged on one side of the combustion chamber, a circular upper cavity is arranged at the upper end of the body, a ring-shaped lower cavity is arranged at the lower end of the body, and the upper cavity and the lower cavity are communicated through a plurality of heat exchange pipes, the body is communicated with the top of the combustion chamber through the center opening of the lower cavity, the top of the body is sealed through the bottom of the upper cavity, the plurality of heat exchange pipes are arranged around the central axis of the body, and the heat exchange pipes are arranged in multiple circles, wherein the outermost circle and the adjacent circle of the heat exchange pipes are fixedly connected through the membrane wall, and the membrane wall below the outermost circle is provided with a ring-shaped bottom flue gas outlet, and the membrane wall on the inner side is provided with a ring-shaped top flue gas opening at the top, a flue gas discharge pipe is arranged on one side of the top of the body, a steam outlet is arranged at the top of the upper cavity, and a water inlet is arranged on one side of the lower cavity.

[0011] Further, the upper cavity and the lower cavity are respectively fixed with hollow box-shaped space eliminating elements.

[0012] Further, the outer side wall of the upper cavity and the lower cavity is communicated through a liquid level meter installation pipe.

[0013] Further, the central opening of the lower cavity is in a conical structure, and the larger opening at the bottom communicates with the top of the combustion chamber.

[0014] Further, the membrane wall is in a bent plate structure with a bending position in the middle part, and the bending position faces the axis of the body, and the membrane wall is welded to two heat exchange pipes at two sides.

[0015] Further, a vertical cylindrical cavity structure is vertically arranged in the upper cavity, the upper end of the cylindrical cavity structure is closed, and a water vapor connecting pipe is horizontally arranged in the cylindrical cavity structure, and the front and rear ends of the water vapor connecting pipe respectively communicate with the front and rear of the upper cavity.

[0016] The natural gas is combusted in the independent combustion chamber, and then the high-temperature flue gas enters the flue gas passage formed by the heat exchange pipe and the membrane wall in the body to perform convection heat transfer, and the flue gas passage is formed in a zigzag manner by the membrane wall, the heat exchange efficiency of the heat exchange pipe is improved through multiple heat transfer and multiple flue gas turning, in addition, the steam connecting pipe and the water pressing strip can be arranged, the water content of the steam is reduced, the box-shaped space elimination element is arranged in the upper and lower cavities, the water volume is less than 50L, the water resource can be effectively utilized, the heat exchange area is larger, the structure is more stable, and even annual inspection is not needed, and the installation and use costs are saved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described in combination with the drawings.

[0018] Figure 1 It is the front view structure schematic drawing of the utility model;

[0019] Figure 2 It is the horizontal section structure schematic drawing of the heat exchange pipe part of the utility model;

[0020] Figure 3 It is the horizontal section structure schematic drawing of the cylindrical cavity structure of the utility model. DETAILED DESCRIPTION

[0021] As Figures 1-3As shown, a natural gas steam boiler comprises a combustion chamber 1 and a cylindrical body 2 arranged above the combustion chamber 1, so that the combustion chamber 1 is separated from the heating surface (i.e. the cylindrical body 2), a natural gas burner is arranged on one side of the combustion chamber 1, the upper end of the body 2 is provided with a circular upper cavity 3, the lower end of the body 2 is provided with an annular lower cavity 4, and the upper cavity 3 and the lower cavity 4 are communicated through a plurality of heat exchange pipes 5, and a vertical water compression strip can be arranged in each heat exchange pipe 5 to facilitate steam-water separation, the body 2 is communicated with the top of the combustion chamber 1 through the central opening of the lower cavity 4, the top of the body 2 is sealed through the bottom of the upper cavity 3, the plurality of heat exchange pipes 5 are arranged around the central axis of the body 2, and the heat exchange pipes 5 are arranged in multiple circles, wherein the outermost circle and the circle adjacent to the outermost circle (i.e. the second circle from the outside to the inside) are fixedly connected through the membrane walls 6, and the membrane wall 6 of the outermost circle is provided with an annular bottom flue gas outlet 7 below, and the membrane wall 6 on the inner side is provided with an annular top flue gas opening 8 at the top, and a flue gas discharge pipe 9 is arranged on one side of the top of the body 2, the top of the upper cavity 3 is provided with a steam outlet 10, and one side of the lower cavity 4 is provided with a water inlet 11.

[0022] The upper cavity 3 and the lower cavity 4 are respectively fixed with hollow box-shaped space elimination members 12, which are used to fill the space of the upper and lower cavities, so that the water volume of the upper and lower cavities of the body 2 is not greater than 50L, the outer side walls of the upper cavity 3 and the lower cavity 4 are communicated through liquid level meter installation pipes 13, the central opening of the lower cavity 4 is in a conical structure, the larger opening at the bottom is communicated with the top of the combustion chamber 1, the membrane wall 6 is in a bent plate structure with a bending position in the middle part, and the bending position faces the central axis of the body 2, and the membrane wall 6 is welded with two heat exchange pipes 5 on both sides.

[0023] The upper cavity 3 is vertically penetrated by a cylindrical cavity structure 14, the upper end of the cylindrical cavity structure 14 is closed, and a water vapor connecting pipe 15 is horizontally penetrated in the cylindrical cavity structure 14, the front and rear ends of the water vapor connecting pipe 15 respectively communicate the front and rear of the upper cavity 3, and the water vapor connecting pipe 15 is fully heat-absorbed to reduce the water-carrying rate of steam.

[0024] Working principle of the utility model

[0025] The flame sprayed by the natural gas burner is fully combusted in the combustion chamber, the high-temperature flue gas enters the central part of the body, rises along the central part of the body, passes through the top flue gas opening 8 after rising to the top, then enters the annular cavity formed by the inner membrane wall and the outer membrane wall 6, then continues to rise along the inner side wall of the body 2 from the bottom flue gas outlet 7, and finally is discharged from the flue gas discharge pipe 9. Figure 1The high-temperature flue gas flows through the path indicated by the middle arrow, and in the process, each heat exchange pipe 5 is heated. Since the upper cavity 3 and the lower cavity 4 are connected through a plurality of heat exchange pipes 5, a heat exchange structure is formed. Water enters the lower cavity 4, and the water in the upper cavity 3, the lower cavity 4 and the heat exchange pipe 5 can be quickly heated, thereby forming steam. The steam and water are heated and rise, and under the action of the water pressing strip, the steam and the water are separated, the dry steam continues to rise into the upper cavity 3, and finally the steam is discharged from the steam outlet 10.

[0026] The above merely illustrates the specific implementation of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. A natural gas steam boiler comprising a combustion chamber (1) and a cylindrical body (2) arranged above the combustion chamber (1), the combustion chamber (1) being provided with a natural gas burner on one side, characterized in that: The upper end of the body (2) is provided with a circular upper cavity (3), the lower end of the body (2) is provided with an annular lower cavity (4), and the upper cavity (3) and the lower cavity (4) are communicated through a plurality of heat exchange pipes (5), the body (2) is communicated with the top of the combustion chamber (1) through the central opening of the lower cavity (4), the top of the body (2) is sealed through the bottom of the upper cavity (3), the plurality of heat exchange pipes (5) are arranged around the central axis of the body (2), and the heat exchange pipes (5) are arranged in multiple circles, wherein the outermost circle and the heat exchange pipes (5) in the adjacent circle are fixedly connected through the membrane wall (6), and the membrane wall (6) of the outermost circle is provided with a ring-shaped bottom flue gas outlet (7) below, and the membrane wall (6) on the inner side is provided with a ring-shaped top flue gas opening (8) on the top, one side of the top of the body (2) is provided with a flue gas discharge pipe (9), the top of the upper cavity (3) is provided with a steam outlet (10), and one side of the lower cavity (4) is provided with a water inlet (11).

2. A natural gas steam boiler as claimed in claim 1, characterized in that: The upper cavity (3) and the lower cavity (4) are respectively fixed with hollow box-shaped space elimination members (12).

3. A natural gas steam boiler as claimed in claim 1, characterized in that: The outer side walls of the upper cavity (3) and the lower cavity (4) are communicated through liquid level meter installation pipes (13).

4. A natural gas steam boiler as defined in claim 1, characterized in that: The central opening of the lower cavity (4) is a conical structure, and the larger opening at the bottom is communicated with the top of the combustion chamber (1).

5. A natural gas steam boiler as defined in claim 1, characterized in that: The membrane wall (6) is a bent plate structure with a bent middle part, and the bent part faces the central axis of the body (2), and the two sides of the membrane wall (6) are welded with two heat exchange pipes (5).

6. A natural gas steam boiler as defined in claim 1, characterized in that: The upper cavity (3) is vertically penetrated by a cylindrical cavity structure (14), the upper end of the cylindrical cavity structure (14) is closed, and a water vapor connecting pipe (15) is horizontally penetrated in the cylindrical cavity structure (14), and the front and rear ends of the water vapor connecting pipe (15) are communicated with the front and rear of the upper cavity (3) respectively.

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