Waste heat energy recycling device of steam boiler

Abstract

The utility model relates to a waste heat recycling device of a steam boiler. Comprising a boiler and a heat exchange assembly, an air inlet pipe is arranged at the upper end of the boiler, an air return pipe is arranged at the lower end of the boiler, the heat exchange assembly comprises a box and a heat exchange pipe, a heat exchange cavity is formed in the box, an air inlet and an air outlet which are communicated with the heat exchange cavity are formed in the outer side wall of the box, and the heat exchange pipe is vertically arranged in the heat exchange cavity and located between the air inlet and the air outlet. The upper ends of the heat exchange pipes communicate with the air inlet pipe, the lower ends of the heat exchange pipes communicate with the air return pipe, and heat exchange fins are arranged on the outer side walls of the heat exchange pipes. Waste heat in boiler flue gas is guided into the heat exchange assembly, high-temperature flue gas is used for heating air in the box body through the heat exchange pipe, and the heated air is fed into a working procedure needing the high-temperature air through the air blower, so that heat energy is recycled, and the production cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of boiler technology, specifically relating to a waste heat energy recycling device for a steam boiler. Background Technology

[0002] Gas-fired steam boilers are steam boilers that use gas combustion for heating. Vertical steam boilers adopt a bottom-mounted burner and a two-pass structure, ensuring complete fuel combustion, stable boiler operation, and minimal space occupation. Additionally, baffles are inserted into the flue tubes to slow down the exhaust gas velocity, increase heat exchange, and result in high boiler thermal efficiency and reduced user operating costs. Horizontal steam boilers feature a shell-type, fully wet-back, co-current, three-pass fire-tube structure. The flame burns under slight positive pressure in the large combustion chamber, allowing for full extension, low combustion heat load, and high combustion thermal efficiency. This effectively reduces exhaust gas temperature, saving energy and reducing consumption, making them more economical to use. The corrugated furnace and threaded flue tube structure improves the boiler's heat absorption intensity and meets the needs of thermal expansion of the heat exchange surface, making it scientifically sound, durable, and long-lasting.

[0003] Boilers produce a large amount of flue gas during operation. This flue gas is hot and comes in large quantities. Directly releasing it into the air will result in a significant waste of energy. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a waste heat energy recycling device for a steam boiler. By introducing the waste heat in the boiler flue gas into the heat exchange component, the high-temperature flue gas is heated by the heat exchange tubes to heat the air inside the box. The heated air is then sent to the process requiring high-temperature air by a blower, thereby realizing the recycling and utilization of heat energy and reducing production costs.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A waste heat energy recycling device for a steam boiler includes a boiler and a heat exchange assembly. The boiler has an inlet pipe at its upper end and a return pipe at its lower end. The heat exchange assembly includes a housing and heat exchange tubes. The housing has a heat exchange chamber. The outer wall of the housing has an inlet and an outlet that are respectively connected to the heat exchange chamber. The heat exchange tubes are vertically placed in the heat exchange chamber and located between the inlet and the outlet. The upper end of the heat exchange tubes is connected to the inlet pipe, and the lower end of the heat exchange tubes is connected to the return pipe. The outer wall of the heat exchange tubes has heat exchange fins.

[0007] The chamber is further provided with a first partition and a second partition. The first partition is horizontally placed at the upper end of the heat exchange chamber and divides the upper end of the heat exchange chamber into a gas collecting chamber. The upper end of the gas collecting chamber is connected to the air inlet pipe, and the lower end of the gas collecting chamber is connected to the heat exchange pipe. The second partition is horizontally placed at the lower end of the heat exchange chamber and divides the lower end of the heat exchange chamber into a gas collecting chamber. The upper end of the gas collecting chamber is connected to the heat exchange pipe, and the lower end of the gas collecting chamber is connected to the return pipe. The heat exchange pipe includes several groups, which are arranged vertically in an array in the heat exchange chamber. The lower half of the heat exchange chamber is sunken. The air inlet and air outlet are both distributed on the upper half of the heat exchange chamber. The heat exchange chamber is provided with two sets of buffer sections, which are respectively located between the air inlet / air outlet and the heat exchange pipe.

[0008] This waste heat energy recycling device for a steam boiler uses this structure. The boiler is a steam boiler, and during its operation, the flue gas it generates is guided through the inlet pipe and sent to the heat exchange assembly. The flue gas first enters the gas collection chamber separated by the first partition at the upper end of the heat exchange chamber inside the casing for temporary storage. Then, the flue gas disperses into several sets of heat exchange tubes within the gas collection chamber. Because the heat exchange tubes are vertically arranged, the heat carried by the flue gas as it flows downwards is conducted to the air outside the heat exchange fins through the heat exchange fins on the outer wall of the heat exchange tubes. In the air exchange chamber, since the heat exchange tubes are located between the air inlet and the air outlet, a blower or other equipment that can increase airflow is installed at the air inlet. The heated air is then blown out from the air outlet and used as a preheating heat source for other processes. To improve the heat exchange efficiency, several sets of heat exchange tubes are arranged in an array. Increasing the number of heat exchange tubes can improve the heat exchange efficiency. After leaving the heat exchange tubes, the flue gas enters the gas collection chamber separated by the second partition at the lower end of the heat exchange chamber. The cooled flue gas is then collected and gathered, and then re-enters the boiler through the return gas pipe at the lower end.

[0009] Since the heat exchange tubes rely on their heat exchange fins for heat exchange, the length of the heat exchange tubes should not be too short. If the length is too short, the flue gas will enter the gas collection chamber before the heat exchange is fully completed. Therefore, by increasing the length of the heat exchange tubes, the heat exchange efficiency can be effectively increased. However, the inlet and outlet should not be enlarged due to the increase in the length of the heat exchange tubes. Therefore, the inlet and outlet are distributed in the upper half of the heat exchange chamber, and the lower half of the heat exchange chamber is sunken to accommodate the extended heat exchange tubes, thereby improving the heat exchange efficiency.

[0010] Furthermore, the heat exchange chamber is provided with a first guide plate and a second guide plate. The first guide plate is inclined from the air inlet toward the lower half of the heat exchange chamber, and the second guide plate is inclined from the lower half of the heat exchange chamber toward the air outlet.

[0011] Compared with the prior art, the advantages of this utility model are as follows: by introducing flue gas from the top of the boiler into the heat exchange tubes inside the box, the heat of the flue gas is transferred from the vertically placed heat exchange tubes to the heat exchange fins. The air completes the heat exchange after passing through several vertically placed heat exchange tubes at the air inlet and is discharged from the air outlet. The heat exchange operation is carried out in the form of vertical heat exchange and horizontal heat conduction, realizing the recycling of residual heat energy. In order to improve the heat exchange efficiency, the heat exchange tubes are lengthened, and the lower half of the heat exchange chamber is set to a sunken shape to increase the contact area between the heat exchange fins and the air, thereby improving the heat exchange efficiency. Attached Figure Description

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a three-dimensional diagram of the utility model;

[0014] Figure 2 This is a top view of the present invention;

[0015] Figure 3 For the present utility model Figure 2 AA sectional view.

[0016] The components are: 1. Boiler; 11. Inlet pipe; 12. Return pipe; 2. Heat exchange assembly; 21. Housing; 211. Heat exchange chamber; 2111. Gas collection chamber; 2112. Gas gathering chamber; 2113. Buffer section; 2114. First guide plate; 2115. Second guide plate; 212. Inlet; 213. Outlet; 214. First partition; 215. Second partition; 22. Heat exchange tube. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] The specific embodiments of this utility model will now be described with reference to the accompanying drawings:

[0019] like Figure 1-3As shown, a waste heat energy recycling device for a steam boiler includes a boiler 1 and a heat exchange assembly 2. The boiler 1 has an air inlet pipe 11 at its upper end and a return air pipe 12 at its lower end. The heat exchange assembly 2 includes a housing 21 and a heat exchange tube 22. The housing 21 has a heat exchange chamber 211 inside. The outer wall of the housing 21 has an air inlet 212 and an air outlet 213 that are respectively connected to the heat exchange chamber 211. The heat exchange tube 22 is vertically placed in the heat exchange chamber 211 and located between the air inlet 212 and the air outlet 213. The upper end of the heat exchange tube 22 is connected to the air inlet pipe 11, and the lower end of the heat exchange tube 22 is connected to the return air pipe 12. The outer wall of the heat exchange tube 22 is provided with heat exchange fins.

[0020] The housing 21 is further provided with a first partition 214 and a second partition 215. The first partition 214 is horizontally placed at the upper end of the heat exchange chamber 211 and divides the upper end of the heat exchange chamber 211 into a gas collecting chamber 2111. The upper end of the gas collecting chamber 2111 is connected to the air inlet pipe 11, and the lower end of the gas collecting chamber 2111 is connected to the heat exchange pipe 22. The second partition 215 is horizontally placed at the lower end of the heat exchange chamber 211 and divides the lower end of the heat exchange chamber 211 into a gas collecting chamber 2112. The upper end of the gas collecting chamber 2112 is connected to the heat exchange pipe. 22, the lower end of the gas collection chamber 2112 is connected to the return gas pipe 12; the heat exchange pipe 22 includes several groups, and the several groups of heat exchange pipes 22 are arranged vertically in the heat exchange chamber 211 in an array; the lower half of the heat exchange chamber 211 is sunken, and the air inlet 212 and air outlet 213 are both distributed on the upper half of the heat exchange chamber 211. The heat exchange chamber 211 is provided with two sets of buffer sections 2113, and the two sets of buffer sections 2113 are respectively located between the air inlet 212 / air outlet 213 and the heat exchange pipe 22.

[0021] Furthermore, the heat exchange chamber 211 is provided with a first guide plate 2114 and a second guide plate 2115. The first guide plate 2114 is inclined from the air inlet 212 toward the lower half of the heat exchange chamber 211, and the second guide plate 2115 is inclined from the lower half of the heat exchange chamber 211 toward the air outlet 213.

[0022] Description of the working principle of this utility model:

[0023] The waste heat energy recycling device of the steam boiler adopts this structure. Boiler 1 is a steam boiler. The operation process of boiler 1 is existing technology, so it will not be described in detail here. During its operation, the flue gas generated is led out through the air inlet pipe 11 on the boiler 1 and sent into the heat exchange assembly 2. The flue gas first enters the gas collection chamber 2111 separated by the first partition 214 at the upper end of the heat exchange chamber 211 inside the housing 21 for temporary storage. Then, the flue gas is dispersed into several sets of heat exchange tubes 22 in the gas collection chamber 2111. Since the heat exchange tubes 22 are arranged vertically, the flue gas carries its own heat through heat exchange on the outer wall of the heat exchange tubes 22 as it moves downward. The heat exchanger conducts heat to the air outside the fins. Since the heat exchanger tube 22 is located between the air inlet 212 and the air outlet 213, a blower or other equipment that can increase airflow is installed at the air inlet 212. The heated air is blown out from the air outlet 213 and used as a preheating heat source for other processes. In order to improve the heat exchange efficiency, several sets of heat exchanger tubes 22 are arranged in an array. Increasing the number of heat exchanger tubes 22 can improve the heat exchange efficiency. After the flue gas leaves the heat exchanger tube 22, it enters the gas collection chamber 2112 separated by the second partition 215 at the lower end of the heat exchange chamber 211. The cooled flue gas is collected and then re-enters the boiler 1 through the return gas pipe 12 at the lower end.

[0024] Since the heat exchange tube 22 relies on its heat exchange fins for heat exchange, its length should not be too short. An excessively short length would cause the flue gas to enter the gas collection chamber 2112 before complete heat exchange. Therefore, increasing the length of the heat exchange tube 22 can effectively increase heat exchange efficiency. However, the inlet 212 and outlet 213 should not be enlarged due to the increase in the length of the heat exchange tube 22. Therefore, the inlet 212 and outlet 213 are distributed in the upper half of the heat exchange chamber 211, while the lower half of the heat exchange chamber 211 is recessed to accommodate the extended heat exchange tube 22. However, because the heat exchange chamber 211... The lower half of 11 is sunken. The air entering from the air inlet 212 tends to flow in a straight line. The air flow at the lower end of the heat exchange chamber 211 is slow. Therefore, a first guide plate 2114 is added to distribute the air entering from the air inlet 212 evenly, so that some of the air flows downward and contacts the heat exchange fins on the heat exchange tube 22. After heat exchange, the air passes through the heat exchange tube 22 and then moves upward through the second guide plate 2115 and is discharged from the air outlet 213. At the same time, a buffer section 2113 is added between the air inlet 212 / air outlet 213 and the heat exchange tube 22 to make the air flow smoother.

[0025] The beneficial effects of this utility model are as follows: by introducing flue gas from the upper end of the boiler 1 into the heat exchange tube 22 inside the housing 21, the heat of the flue gas is transferred from the vertically placed heat exchange tube 22 through the heat exchange fins. The air completes the heat exchange after passing through several vertically placed heat exchange tubes 22 at the air inlet 212 and is discharged from the air outlet 213. The heat exchange operation is carried out in the form of vertical heat exchange and horizontal heat conduction, so as to realize the recycling of residual heat energy. In order to improve the heat exchange efficiency, the heat exchange tube 22 is lengthened, and the lower half of the heat exchange chamber 211 is set to a sunken shape to increase the contact area between the heat exchange fins and the air, thereby improving the heat exchange efficiency.

[0026] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waste heat energy recycling device for a steam boiler, characterized in that: The system includes a boiler and a heat exchange assembly. The boiler has an inlet pipe at its upper end and a return pipe at its lower end. The heat exchange assembly includes a housing and heat exchange tubes. The housing contains a heat exchange chamber. The outer wall of the housing has an inlet and an outlet that are respectively connected to the heat exchange chamber. The heat exchange tubes are vertically placed in the heat exchange chamber and located between the inlet and outlet. The upper end of the heat exchange tubes is connected to the inlet pipe, and the lower end is connected to the return pipe. The outer wall of the heat exchange tubes has heat exchange fins. The lower half of the heat exchange chamber is sunken. The inlet and outlet are both located on the upper half of the heat exchange chamber. The heat exchange chamber has two sets of buffer sections, which are located between the inlet / outlet and the heat exchange tubes, respectively. The heat exchange chamber has a first guide plate and a second guide plate. The first guide plate is inclined from the inlet towards the lower half of the heat exchange chamber, and the second guide plate is inclined from the lower half of the heat exchange chamber towards the outlet.

2. The waste heat energy recycling device for a steam boiler according to claim 1, characterized in that: The chamber is also provided with a first partition and a second partition. The first partition is horizontally placed at the upper end of the heat exchange chamber and divides the upper end of the heat exchange chamber into a gas collecting chamber. The upper end of the gas collecting chamber is connected to the air inlet pipe, and the lower end of the gas collecting chamber is connected to the heat exchange pipe. The second partition is horizontally placed at the lower end of the heat exchange chamber and divides the lower end of the heat exchange chamber into a gas gathering chamber. The upper end of the gas gathering chamber is connected to the heat exchange pipe, and the lower end of the gas gathering chamber is connected to the return gas pipe.

3. The waste heat energy recycling device for a steam boiler according to claim 2, characterized in that: The heat exchange tubes include several groups, which are arranged vertically in an array in the heat exchange cavity.

Images