Heat exchange furnace body of steam boiler

Abstract

An air inlet device and an exhaust mechanism are connected to the two sides of the recuperative boiler body respectively, and the recuperative boiler body comprises a water inlet bin, a combustion layer and a steam storage bin which are sequentially arranged from bottom to top. The combustion layer comprises a combustion bin communicated with the air inlet device and the exhaust mechanism, and an isolation bin for isolating the combustion bin from the outer wall; a plurality of steam guide pipes which vertically communicate with the water inlet bin and the steam storage bin and are arranged at intervals are arranged in the combustion bin; two membrane walls for separating the isolation bin from the combustion bin are arranged in the combustion layer; the membrane wall guides high-temperature airflow to flow to the exhaust mechanism; and the combustion bin is provided with a convex inner cavity which is gradually expanded close to the exhaust mechanism. According to the utility model, the structural design is reasonable, the convex space is arranged in the combustion bin, the narrower air duct is arranged at the ignition port to guide high-temperature air flow to quickly pass through, and the larger space is arranged at the position far away from the ignition port, so that the retention time of the high-temperature air flow is prolonged, and the balance of the heating efficiency of the front space and the rear space in the combustion bin is realized; and equipment loss caused by local high temperature is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steam equipment technology, and in particular to a heat exchange furnace body for a steam boiler. Background Technology

[0002] A steam boiler is a mechanical device that uses the thermal energy of fuel or other energy sources to heat water into hot water or steam. Currently, most of the boilers in use are gas-fired steam boilers. Chinese patent document CN222143016U discloses a novel once-through steam generator, relating to the field of steam generator technology. It includes a boiler body, a condenser, and a feedwater pump, with the condenser located on the left side of the boiler body. This invention uses a circulating water pump to deliver soft water to the condenser. The water in the condenser is preheated and deoxygenated by hot flue gas before entering the boiler body, where it is heated by a burner. The burner, through thorough mixing of air and natural gas, ensures more complete combustion. This solves the safety issues of steam saturation and boiler overheating present in most existing once-through gas-fired steam generators. Furthermore, the condenser, often a pressure-bearing component, has high pressure requirements and poses certain safety hazards. This invention achieves this by using a condenser as an atmospheric pressure component, reducing safety risks, and employing a special separation device to achieve a steam saturation of over 98%, significantly reducing boiler overheating. However, most existing steam boilers have uniformly spaced heating tubes in the chamber, and the heat exchange is concentrated on the side near the ignition end. The heat exchange efficiency is unevenly distributed, which can easily cause local high temperature, poor airflow, and uneven heating. Utility Model Content

[0003] The purpose of this utility model is to provide a heat exchange furnace body for a steam boiler, which solves the problems of local high temperature, uneven heating, and high energy consumption of the heat exchange furnace body in existing steam boilers.

[0004] To address the aforementioned problems, this utility model provides a heat exchanger body for a steam boiler, with an air inlet device and an exhaust mechanism connected to both sides respectively. It includes a water inlet chamber, a combustion layer, and a steam storage chamber arranged sequentially from bottom to top. The combustion layer includes a combustion chamber connecting the air inlet device and the exhaust mechanism, and an isolation chamber separating the combustion chamber from the outer wall. The combustion chamber contains multiple vertically arranged steam guide pipes connecting the water inlet chamber and the steam storage chamber. The combustion layer contains two membrane walls separating the isolation chamber and the combustion chamber. The membrane walls guide high-temperature airflow towards the exhaust mechanism. The combustion chamber has a convex inner cavity that gradually expands towards the exhaust mechanism.

[0005] The heat exchange furnace body of the steam boiler provided by this utility model also has the following technical features:

[0006] Furthermore, the combustion chamber is arranged in sequence along the direction close to the exhaust mechanism as a combustion section, a gap section, and a tail heat section; the spacing between adjacent steam pipes increases sequentially along the direction of the combustion section, the gap section, and the tail heat section.

[0007] Furthermore, the outer wall of the steam guide pipe in the combustion section and the gap section is a smooth wall; the outer wall of the steam guide pipe in the tail heat section is provided with spiral fins.

[0008] Furthermore, the membrane wall consists of the steam pipe placed on the side and a sealing plate connecting two adjacent steam pipes.

[0009] Furthermore, an isolation chamber is provided on each side of the combustion chamber; each isolation chamber is provided with at least one settling pipe that vertically connects the steam storage chamber and the water inlet chamber.

[0010] Furthermore, the top of the steam storage chamber is connected to a steam-water separator via a vertical vent pipe; the steam-water separator is equipped with an inverted V-shaped flow-gathering plate fixed to its top wall by a hanger; the flow-gathering plate is inclined upward along the direction close to the exhaust mechanism; the bottom of the steam-water separator is equipped with a guide pipe connected to the water inlet chamber on the side close to the air inlet device.

[0011] Furthermore, the top of the gas storage chamber is provided with an arc-shaped dome.

[0012] This utility model has the following beneficial effects: The structure is reasonable and simple. By designing a convex space within the combustion chamber and a narrow air duct at the ignition port, high-temperature airflow is guided to pass quickly. A larger space is provided away from the ignition port, increasing the residence time of the high-temperature airflow and the contact time between the high-temperature airflow and the steam pipe. This achieves balanced heating efficiency between the front and rear spaces within the combustion chamber, ensuring even heating of steam and achieving balanced heat distribution within the combustion chamber, fully utilizing heat and reducing damage to the equipment caused by localized high temperatures. By gradually widening the gap of the heat-conducting pipe away from the ignition port inlet of the combustion chamber, the airflow is ensured to be unobstructed, allowing the high-temperature airflow to flow quickly backward, preventing the accumulation of high-temperature airflow that could cause localized high temperatures at the ignition port and excessive damage to the equipment. The smooth-walled steam pipe within the combustion section creates short-term contact with the high-temperature airflow, ensuring sufficient heating of the water flow within the steam pipe while simultaneously ensuring rapid transmission of the high-temperature airflow backward, reducing the risk of high-temperature airflow accumulating at the ignition port and causing localized high temperatures. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the internal structure of an embodiment of the present utility model;

[0014] Figure 2 This is a cross-sectional schematic diagram of the combustion layer in an embodiment of the present invention;

[0015] Figure 3 This is a structural diagram showing the usage state of an embodiment of the present utility model;

[0016] Figure 4 This is a structural diagram showing the usage state of an embodiment of the present utility model;

[0017] Figure 5 This is a schematic cross-sectional view of the structure in use according to an embodiment of the present invention;

[0018] Figure 6 This is a schematic diagram of the internal structure of the flue in use according to an embodiment of this utility model;

[0019] In the diagram: 1-furnace body, 11-water inlet chamber, 12-combustion layer, 121-combustion chamber, 1211-combustion section, 1212-gap section, 1213-tail heat section, 122-isolation chamber, 1221-settling pipe, 123-steam guide pipe, 124-membrane wall, 1241-sealing plate, 13-steam storage chamber, 131-vent pipe, 2-air inlet device, 21-premixed fan, 22-air inlet pipe, 23-air inlet, 24-filter, 3-exhaust mechanism, 31-flue, 32-bend, 4-steam-water separator, 41-flow concentrator, 42-hanger, 43-flow guide pipe, 5-preheating device, 51-preheating finned tube, 52-water inlet pipe, 53-water outlet pipe, 54-water inlet. Detailed Implementation

[0020] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0021] like Figures 1 to 6In one embodiment of the heat exchange furnace body of the steam boiler of this utility model, an air inlet device 2 and an exhaust mechanism 3 are respectively connected to both sides. The furnace body 1 includes a water inlet chamber 11, a combustion layer 12, and a steam storage chamber 13 arranged sequentially from bottom to top. The combustion layer 12 includes a combustion chamber 121 connecting the air inlet device 2 and the exhaust mechanism 3, and an isolation chamber 122 separating the combustion chamber 121 from the outer wall. The combustion chamber 121 is provided with a plurality of vertically arranged steam guide pipes 123 that connect the water inlet chamber 11 and the steam storage chamber 13 and are spaced apart. The combustion layer 12 is provided with two membrane walls 124 that separate the isolation chamber 122 and the combustion chamber 121. The membrane walls 124 guide the high-temperature airflow to flow towards the exhaust mechanism 3. The combustion chamber 121 is provided with a convex inner cavity that gradually expands near the exhaust mechanism 3. By designing a convex space within the combustion chamber and a narrow air duct at the ignition port to guide the high-temperature airflow through quickly, and by creating a larger space away from the ignition port to increase the residence time of the high-temperature airflow and the contact time between the high-temperature airflow and the steam pipe, the heating efficiency of the front and rear steam pipes within the combustion chamber is balanced, ensuring uniform heating of the steam before and after the combustion chamber, making full use of the heat, and reducing the damage to the equipment caused by localized high temperatures.

[0022] Specifically, the combustion chamber 121, along the direction closest to the exhaust mechanism 3, consists of a combustion section 1211, a gap section 1212, and a tail heat section 1213. The spacing between adjacent heat pipes 123 increases sequentially along the direction of the combustion section 1211, the gap section 1212, and the tail heat section 1213. By gradually widening the gap between the heat pipes away from the ignition port at the combustion chamber inlet, the airflow is ensured to be smooth, allowing the high-temperature airflow to flow rapidly backward, thus preventing the accumulation of high-temperature airflow that could cause localized high temperatures at the ignition port and result in excessive localized wear of the equipment.

[0023] Specifically, the outer walls of the steam guide pipes 123 in the combustion section 1211 and the gap section 1212 are smooth; the outer walls of the steam guide pipes 123 in the tail section 1213 are equipped with spiral fins. By setting the steam guide pipes with smooth walls in the combustion section, a short-term contact of high-temperature airflow is formed, ensuring sufficient heating of the water flow in the steam guide pipes, and at the same time ensuring that the high-temperature airflow is rapidly transmitted backward, reducing the risk of high-temperature airflow accumulating at the ignition port and causing local high temperatures.

[0024] Specifically, the membrane wall 124 consists of a steam pipe 123 placed on the side and a sealing plate 1241 connecting two adjacent steam pipes 123. The steam pipe and the sealing plate work together to form an isolation, further reducing the efficiency of heat exchange from the combustion chamber to the outside and ensuring efficient backward flow of high-temperature airflow in the combustion chamber.

[0025] Specifically, an isolation chamber 122 is provided on each side of the combustion chamber 121; each isolation chamber 122 is provided with at least one settling pipe 1221 that vertically connects the steam storage chamber 13 and the water inlet chamber 11.

[0026] Specifically, the top of the steam storage chamber 13 is connected to the steam-water separator 4 through a vertical vent pipe 131; the steam-water separator 4 is provided with an inverted V-shaped flow-gathering plate 41 fixed to its top wall by a hanger 42; the flow-gathering plate 41 is inclined upward along the direction close to the exhaust mechanism 3; the bottom of the steam-water separator 4 is provided with a guide pipe 43 connected to the water inlet chamber 11 on the side close to the air inlet device 2.

[0027] Specifically, the top of the steam storage chamber 13 is equipped with an arc-shaped roof.

[0028] The combustion chamber 121 inlet uses a common ignition method in the prior art, such as using a combustion rod and an ignition needle for ignition; the steam pipe 123 inside the tail heat section 1213 is a finned tube.

[0029] The water inlet chamber 11 is located at the bottom of the combustion layer 12 and is connected to the bottom end of the steam pipe 123. The water inlet chamber 11 is connected to the water outlet pipe 53 through a pipeline. The sewage pipe assembly with a control valve in the prior art is used for sewage discharge inside the water inlet chamber 11. The steam storage chamber 13 is located at the top of the combustion layer 12. The top surface of the arc-shaped steam storage chamber 13 forms a good pressure bearing effect to meet the steam storage requirements. At the same time, the steam-water separator 4 separates the moisture in the steam at the top of the steam storage chamber 13.

[0030] Working principle: When the equipment is in use, external clean water enters the inlet pipe 52 through the inlet 54, passes through the preheated finned tube 51 connected end to end, and then enters the inlet chamber 11 through the pipeline. The liquid level gauge and control valve in the existing technology control the opening and closing of the loop according to the liquid level in the inlet chamber 11. After the water level in the inlet chamber 11 reaches the preset position, the equipment is ignited. The premixed blower 21 blows the gas mixed with the outside air into the combustion chamber 121, directly igniting the steam guide pipe 123 in the combustion section 121. Heating is performed in the combustion chamber 121, which has a sealed top and bottom. The internal inlet of the combustion chamber 121 uses a common combustion rod and ignition needle for ignition. The combustion chamber 121 contains multiple vertically connected steam pipes 123 linking the water inlet chamber 11 and the steam storage chamber 13. The outer walls of the steam pipes 123 within the combustion chamber 1211 are smooth and evenly distributed, with gaps between them for air circulation. This ensures good contact between the steam pipes 123 and the air, resulting in high temperatures after ignition. The airflow converts the water inside the steam pipe 123 into steam through heat exchange. In the gap section 1212, the gaps in the steam pipe 123 widen, increasing the airflow space and reducing the resistance to airflow from the dense steam pipes 123, ensuring smooth airflow. The airflow temperature decreases as it enters the tail section 1213. In this section, the airflow velocity is slowed down by the airflow stagnation space. Furthermore, the spiral fins on the outer wall of the steam pipe 123 ensure sufficient contact between the steam pipe 123 and the high-temperature airflow, achieving a sufficient duration of heat exchange. The process ensures efficient steam generation. After the high-temperature airflow enters the steam storage chamber 13 with an arc-shaped dome, the airflow initially condenses and falls from the cooler settling pipe 1221 into the water inlet chamber 12. Most of the airflow enters the steam-water separator 4 through the vent pipe 131. Guided and gathered by the inverted V-shaped concentrator 41, the water vapor in the airflow gathers and falls into the guide pipe 43 and re-enters the water inlet chamber 11 for reuse. The steam after separating the water vapor is discharged from the outlet at the top of the steam-water separator 4 for use.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat exchange furnace body for a steam boiler, wherein an air inlet device (2) and an exhaust mechanism (3) are respectively connected to both sides, characterized in that: The furnace body (1) includes a water inlet chamber (11), a combustion layer (12), and a steam storage chamber (13) arranged sequentially from bottom to top; the combustion layer (12) includes a combustion chamber (121) connecting the air inlet device (2) and the exhaust mechanism (3), and an isolation chamber (122) separating the combustion chamber (121) from the outer wall; the combustion chamber (121) is provided with a plurality of vertically connected steam guide pipes (123) connecting the water inlet chamber (11) and the steam storage chamber (13) and spaced apart; the combustion layer (12) is provided with two membrane walls (124) separating the isolation chamber (122) and the combustion chamber (121); the membrane walls (124) guide the high-temperature airflow to flow towards the exhaust mechanism (3); the combustion chamber (121) is provided with a convex inner cavity that gradually expands near the exhaust mechanism (3).

2. The heat exchange furnace body of the steam boiler according to claim 1, characterized in that: The combustion chamber (121) is arranged in sequence along the direction close to the exhaust mechanism (3) as a combustion section (1211), a gap section (1212), and a tail heat section (1213); the spacing between adjacent steam pipes (123) increases sequentially along the direction of the combustion section (1211), the gap section (1212), and the tail heat section (1213).

3. The heat exchange furnace body of the steam boiler according to claim 2, characterized in that: The outer wall of the steam pipe (123) in the combustion section (1211) and the gap section (1212) is a smooth wall; the outer wall of the steam pipe (123) in the tail heat section (1213) is provided with spiral fins.

4. The heat exchange furnace body of the steam boiler according to claim 1, characterized in that: The membrane wall (124) consists of the steam pipe (123) placed on the side and the sealing plate (1241) connecting two adjacent steam pipes (123).

5. The heat exchange furnace body of the steam boiler according to claim 1, characterized in that: An isolation chamber (122) is provided on each side of the combustion chamber (121); each isolation chamber (122) is provided with at least one settling pipe (1221) that vertically connects the steam storage chamber (13) and the water inlet chamber (11).

6. The heat exchange furnace body of the steam boiler according to claim 1, characterized in that: The top of the steam storage chamber (13) is connected to the steam-water separator (4) through a vertical vent pipe (131); the steam-water separator (4) is provided with an inverted V-shaped flow-gathering plate (41) fixed to its top wall by a hanger (42); the flow-gathering plate (41) is inclined upward along the direction close to the exhaust mechanism (3); the bottom of the steam-water separator (4) is provided with a guide pipe (43) connected to the water inlet chamber (11) on the side close to the air inlet device (2).

7. The heat exchange furnace body of the steam boiler according to claim 1, characterized in that: The top of the gas storage compartment (13) is provided with an arc-shaped top.

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