A boiler room waste heat recovery system

Abstract

This utility model relates to the field of waste heat recovery technology, and particularly to a boiler room waste heat recovery system, comprising: a boiler room main body with a chimney and functional chambers on the outside; a boiler module including several boiler bodies and a makeup water tank; a flue gas duct disposed within the functional chambers; an air circulation module including an induced draft unit, an exhaust air unit, and a circulation channel, wherein the induced draft unit is disposed at the top of the boiler room main body, the exhaust air unit is disposed above the boiler module, and the circulation channel is disposed within the functional chamber and above the flue gas duct, and the circulation channel is connected to the induced draft unit and the exhaust air unit; and a heat exchange module disposed within the functional chamber, including an evaporation unit and a condensation unit, wherein the evaporation unit exchanges heat and cools the gas in the circulation channel and the flue gas duct; and the condensation unit is disposed below the flue gas duct and exchanges heat with the liquid in the makeup water tank. This utility model can efficiently recover waste heat from the boiler room and provide a good working environment.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a waste heat recovery system for boiler rooms. Background Technology

[0002] In the traditional boiler room environment, the boiler's insulation shell inevitably generates a large amount of heat during operation. In addition, the boiler and its auxiliary equipment also release significant heat dissipation during continuous operation. The combined effect of these two factors results in a significant increase in the overall temperature inside the boiler room, creating a harsh working environment for the operators.

[0003] In such high-temperature environments, attempting to cool down using traditional air conditioning systems not only reveals that their actual cooling effect is unsatisfactory and fails to achieve the intended cooling purpose, but also consumes electricity to power the air conditioning system. Furthermore, the boiler's heat dissipates directly into the environment and cannot be recycled, resulting in high overall energy consumption and low energy efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a boiler room waste heat recovery system to solve the problems of high temperature, poor cooling effect and low energy utilization efficiency in existing boiler rooms.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a boiler room waste heat recovery system, comprising: The main body of the boiler room has a chimney and functional chambers on the outside. The boiler module includes several boiler bodies and a water supply tank. The boiler bodies are located inside the main boiler room, and the water supply tanks are located in the functional chambers. The boiler bodies and the water supply tanks are connected. The flue gas duct is located in the functional chamber and above the makeup water tank. It is connected to the boiler body through the flue gas pipeline and transports the flue gas generated by the boiler to the chimney for discharge. The air circulation module includes an induced draft unit, an exhaust air unit, and a circulation channel. The induced draft unit is located at the top of the main body of the boiler room, the exhaust air unit is located above the boiler module, and the circulation channel is located in the functional chamber and above the flue gas duct. The circulation channel is connected to the induced draft unit and the exhaust air unit. The heat exchange module, located in the functional chamber, includes an evaporation unit and a condensation unit. The evaporation unit is located at the junction of the circulating flow channel and the flue gas flow channel, and performs heat exchange and cooling on the gas in the circulating flow channel and the flue gas flow channel. The condensation unit is located below the flue gas flow channel and performs heat exchange with the liquid in the makeup water tank.

[0006] Specifically, the heat exchange module uses a compressor to drive the heat exchange medium to evaporate and condense in the evaporation and condensation units, thereby completing heat absorption and release. Those skilled in the art can adjust this according to actual conditions, without making specific limitations. Specifically, the compressor can be located within the functional chamber.

[0007] In this embodiment, the heat exchange module also includes a waste heat recovery unit, which is installed between the flue gas pipeline and the flue gas flow channel. The waste heat recovery unit is connected to the makeup water tank through a heat exchange pipeline. The heat exchange pipeline transports the liquid in the makeup water tank to the waste heat recovery unit to exchange heat with the flue gas and then transports it back to the makeup water tank.

[0008] In this embodiment, the supplementary water tank is equipped with an overflow baffle, which divides the overflow baffle into a first heat exchange zone and a second heat exchange zone. The first heat exchange zone and the second heat exchange zone are connected through an overflow notch at the top of the overflow baffle. The first heat exchange zone is connected to an external pipeline, and the liquid in the first heat exchange zone exchanges heat with the condensing unit. The liquid in the second heat exchange zone enters the waste heat recovery unit through the heat exchange pipeline for heat exchange and then returns. The second heat exchange zone is connected to the boiler body through a supplementary pipeline.

[0009] In this embodiment, a liquid level sensor is provided in the second heat exchange zone.

[0010] In this embodiment, the circulation channel includes a conveying section and a bending section. The bending section is S-shaped. The two ends of the conveying section are connected to the air intake unit and the bottom end of the bending section, respectively. The other end of the bending section is connected to the air outlet unit. The evaporation unit exchanges heat with the air in the bending section.

[0011] In this embodiment, a condensate storage tank is provided at the bottom of the bend, and the condensate storage tank is connected to the outside through a discharge pipe, and a one-way valve is provided on the discharge pipe.

[0012] In this embodiment, the air circulation module further includes a drive unit, which is disposed in the circulation channel. The drive unit drives the air in the circulation channel to flow, so that the air in the circulation channel flows from the induced draft unit to the exhaust unit.

[0013] In this embodiment, the drive unit includes an induced draft fan and an expelling draft fan. The induced draft fan is disposed in the conveying section, and the expelling draft fan is disposed in the bending section.

[0014] In this embodiment, the air intake unit includes an air inlet, a gas collection hood, and a collection pipeline. The air inlets are spaced apart on the top of the main body of the boiler room. The air inlets are connected to the circulation channel through the collection pipeline, and the gas collection hood is installed at the air inlet.

[0015] In this embodiment, the air outlet unit includes an air outlet duct, an air outlet, and a diffuser. The air outlet duct is located between the air outlet and the circulation channel. The air outlets are spaced apart in the upper middle part of the boiler room body, and the diffuser is located at the air outlet.

[0016] The beneficial effects of this utility model are as follows: Traditional boiler room waste heat includes flue gas waste heat and ambient waste heat. Currently, ambient waste heat is mainly cooled by air conditioning systems or by fans to exhaust the hot air from the boiler room. Both methods consume a lot of energy and have little cooling effect, and cannot recover the waste heat from the air in the boiler room, resulting in high overall energy consumption and low energy utilization efficiency of the boiler room.

[0017] Therefore, this invention employs an air circulation module and a heat exchange module. Utilizing the rising property of hot air, high-temperature air from the top of the boiler room is introduced into the circulation channel via an induced draft unit. Within the circulation channel, the high-temperature air exchanges heat with the evaporation unit, cooling down. The cooled air is then returned to the boiler room via an exhaust unit, where it descends, further promoting the rise of hot air within the boiler room. This creates air circulation within the boiler room, effectively reducing the temperature at the bottom of the boiler room and significantly improving the working environment for operators. Simultaneously, after absorbing heat, the evaporation unit releases it in the replenishment water tank via the condensation unit, heating the replenishment water and reusing the heat. This reduces energy consumption, saves energy, reduces emissions, and improves the working environment.

[0018] Meanwhile, traditional boiler rooms cool the flue gas generated by the boiler system before releasing it to meet environmental protection requirements, thus wasting the waste heat of the flue gas. Setting up a separate cooling system not only requires a lot of space but also results in low equipment utilization. Therefore, this invention, by setting up a separate flue gas duct, ensures that the flue gas does not mix with air and leak, and places the flue gas duct in close proximity to the circulation duct. This allows the evaporation unit to exchange heat simultaneously with both the circulation and flue gas ducts, enabling a single heat exchange module to handle both environmental waste heat and flue gas waste heat recovery. This simplifies the equipment and effectively improves energy efficiency. Furthermore, it ensures the normal operation of the heat exchange module even at low ambient temperatures, guaranteeing that the water temperature in the makeup water tank reaches the required level. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle.

[0021] Label Explanation: 1. Boiler room main body; 11. Chimney; 12. Functional chamber; 2. Boiler module; 21. Boiler body; 22. Makeup water tank; 221. Overflow baffle; 222. First heat exchange zone; 223. Second heat exchange zone; 224. Liquid level sensor; 3. Flue gas flow channel; 31. Flue gas pipeline; 4. Air circulation module; 41. Exhaust fan unit; 411. Gas collection hood; 412. Collection pipeline; 42. Air outlet unit; 421. Air outlet pipeline; 422. Diffuser; 43. Circulation channel; 431. Conveying section; 432. Bending section; 44. Exhaust fan; 45. Supply fan; 5. Heat exchange module; 51. Evaporation unit; 52. Condensation unit; 53. Waste heat recovery unit. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Please refer to Figure 1 and Figure 2 A boiler room waste heat recovery system, comprising: The boiler room main body 1 has a chimney 11 and a functional chamber 12 on the outside; Boiler module 2 includes several boiler bodies 21 and a water supply tank 22. The boiler bodies 21 are installed in the main body 1 of the boiler room, and the water supply tank 22 is installed in the functional chamber 12. The boiler bodies 21 and the water supply tank 22 are connected. The flue gas flow channel 3 is located in the functional chamber 12 and above the supplementary water tank 22. It is connected to the boiler body 21 through the flue gas pipeline 31. The flue gas flow channel 3 transports the flue gas generated by the boiler to the chimney 11 for discharge. The air circulation module 4 includes an induced draft unit 41, an exhaust air unit 42, and a circulation channel 43. The induced draft unit 41 is located on the top of the boiler room main body 1, the exhaust air unit 42 is located above the boiler module 2, and the circulation channel 43 is located in the functional chamber 12 and above the flue gas duct 3. The circulation channel 43 is connected to the induced draft unit 41 and the exhaust air unit 42. The heat exchange module 5 is located in the functional chamber 12 and includes an evaporation unit 51 and a condensation unit 52. The evaporation unit 51 is located at the junction of the circulation channel 43 and the flue gas channel 3. The evaporation unit 51 performs heat exchange and cooling on the gas in the circulation channel 43 and the flue gas channel 3. The condensation unit 52 is located below the flue gas channel 3 and performs heat exchange with the liquid in the replenishment water tank 22.

[0025] Compared to the air in the boiler room, the temperature of the flue gas is higher. If the flue gas directly contacts the evaporation unit 51, it may exceed the heat exchange capacity of the evaporation unit 51 per unit time, resulting in the heat exchange of the circulation channel 43 and the flue gas flow channel 3 failing to meet requirements. Therefore, in this embodiment, the heat exchange module 5 also includes a waste heat recovery unit 53, which is located between the flue gas pipeline 31 and the flue gas flow channel 3. The waste heat recovery unit 53 is connected to the makeup water tank 22 through a heat exchange pipeline. The heat exchange pipeline transports the liquid in the makeup water tank 22 to the waste heat recovery unit 53 for heat exchange with the flue gas and then returns it to the makeup water tank 22. This ensures that the flue gas output from the boiler body 21 undergoes preliminary heat exchange and cooling with the waste heat recovery unit 53 before entering the flue gas flow channel 3 for secondary heat exchange and cooling with the evaporation unit 51, thereby guaranteeing the heat exchange effect of the evaporation unit 51.

[0026] Since the waste heat recovery unit 53 exchanges heat with the flue gas through the supplementary water in the supplementary water tank 22, and the supplementary water after heat exchange is still transported back to the supplementary water tank 22, the temperature of the supplementary water after heat exchange with the flue gas is relatively high. If it is directly mixed with other water in the supplementary water tank 22, the overall temperature of the water in the supplementary water tank 22 will rise. This will affect the heat exchange between the water in the supplementary water tank 22 and the condensing unit 52, and the temperature of the supplementary water entering the boiler body 21 from the supplementary water tank 22 will be lower than the temperature of the supplementary water after heat exchange with the flue gas, thus affecting the operating efficiency of the boiler. Therefore, an overflow baffle 221 is provided in the supplementary water tank 22, which divides the supplementary water tank 221 into a first heat exchange zone 222 and a second heat exchange zone 223. The first heat exchange zone 222 and the second heat exchange zone 223 are connected through an overflow notch at the top of the overflow baffle 221. The first heat exchange zone 222 is connected to an external pipeline, and the liquid in the first heat exchange zone 222 exchanges heat with the condensing unit 52. The liquid in the second heat exchange zone 223 enters the waste heat recovery unit 53 through a heat exchange pipeline for heat exchange and then returns. The second heat exchange zone 223 is connected to the boiler body 21 through a supplementary pipeline. By dividing the supplementary water tank 22 into zones through the overflow baffle 221, the temperature of the supplementary water entering the boiler body 21 meets the requirements, while improving the overall heat exchange efficiency of the heat exchange module 5.

[0027] In this embodiment, a liquid level sensor 224 is provided in the second heat exchange zone 223. When the liquid level sensor 224 detects that the water level in the second heat exchange zone 223 is insufficient, supplementary water is introduced into the first heat exchange zone 222 to ensure that the waste heat recovery unit 53 has sufficient supplementary water for heat exchange circulation, thus preventing the waste heat recovery unit 53 from being damaged by dry burning.

[0028] Preferably, two level sensors 224 are provided to detect the pumping level of the waste heat recovery unit 53 and the pumping level of the make-up water for the boiler body 21, respectively, so that the operator can accurately understand the remaining amount of make-up water in the second heat exchange zone 223, and facilitate the operator to control and adjust when the machine needs to be shut down for maintenance.

[0029] Preferably, the first heat exchange zone 222 and the second heat exchange zone 223 are connected to external equipment via pipelines, which not only provides water of different temperatures to the external equipment, but also ensures that the heat exchange cycle can proceed normally when the boiler body 21 does not require the addition of supplementary water. Preferably, the first heat exchange zone 222 and the second heat exchange zone 223 are also equipped with temperature sensors, so that water in different zones enters the next zone or is transported to other equipment after reaching the set temperature.

[0030] In this embodiment, the circulation channel 43 includes a conveying section 431 and a bending section 432. The bending section 432 is generally S-shaped. Both ends of the conveying section 431 are connected to the bottom of the air intake unit 41 and the bottom of the bending section 432, respectively. The other end of the bending section 432 is connected to the air outlet unit 42. The evaporation unit 51 exchanges heat with the air inside the bending section 432. This arrangement increases the heat exchange area between the circulation channel 43 and the evaporation unit 51, improving the heat exchange effect. Preferably, those skilled in the art can adjust the number of bends in the bending section 432 as needed, thereby further increasing the heat exchange unit and ensuring that the air temperature after heat exchange meets the requirements.

[0031] Preferably, the bottom of the bend 432 is provided with a condensate storage tank (not shown in the figure), which is connected to the outside via a discharge pipe equipped with a one-way valve. The one-way valve opens when the condensate accumulates to a certain amount, discharging the condensate from the boiler room body 1, keeping the air inside the boiler room body 1 dry, preventing the generation of humid and hot air, and thus providing a more comfortable working environment. Preferably, the bottom baffle of the bend 432 is inclined, allowing the condensate to flow fully into the condensate storage tank.

[0032] In this embodiment, the air circulation module 4 further includes a drive unit disposed within the circulation channel 43. The drive unit drives the air within the circulation channel 43 to flow from the induced draft unit 41 to the exhaust unit 42. The drive unit accelerates airflow, speeds up heat exchange, and ensures sufficient heat exchange, effectively reducing ambient temperature and improving the working environment.

[0033] In this embodiment, the drive unit includes an induced draft fan 44 and an expelled draft fan 45. The induced draft fan 44 is disposed in the conveying section 431, and the expelled draft fan 45 is disposed in the bending section 432. The induced draft fan 44 draws in the conveying section 431, causing the high-temperature air at the top of the boiler room body 1 to flow along the conveying section 431 to the bending section 432. After heat exchange, the high-temperature air is driven by the expelled draft fan 45 and blown into the boiler room body 1 by the air outlet unit 42.

[0034] In this embodiment, the air intake unit 41 includes an air inlet (not shown in the figure), a gas collecting hood 411, and a collecting pipe 412. The air inlets are spaced apart on the top of the boiler room main body 1, and are connected to the circulation channel 43 via the collecting pipe 412. The gas collecting hood 411 is located at the air inlet. The gas collecting hood 411 can guide air from the top of the boiler room main body 1 into the air inlet, and then transport it to the circulation channel 43 via the collecting pipe 412. Specifically, the gas collecting hood 411 adopts a gradually widening trumpet shape, which can fully collect the high-temperature air from the top and improve the intake efficiency.

[0035] In this embodiment, the air outlet unit 42 includes an air outlet duct 421, an air outlet (not shown in the figure), and a diffuser 422. The air outlet duct 421 is disposed between the air outlet and the circulation channel 43. The air outlets are spaced apart in the upper middle part of the boiler room body 1, and the diffuser 422 is disposed at the air outlet. The diffuser 422 enables the cooled air after heat exchange to flow evenly from top to bottom, effectively reducing the temperature of the working environment and forming a circulation of air within the boiler room body 1.

[0036] Although this document uses terms such as boiler room main body, chimney, and functional chambers frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

[0037] Finally, it should be noted that 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 boiler room waste heat recovery system, characterized in that, include: The boiler room has a main body (1) with a chimney (11) and functional chambers (12) on the outside. The boiler module (2) includes several boiler bodies (21) and a water supply tank (22). The boiler bodies (21) are located in the main body of the boiler room (1), and the water supply tank (22) is located in the functional chamber (12). The boiler bodies (21) and the water supply tank (22) are connected. The flue gas duct (3) is located in the functional chamber (12) and above the supplementary water tank (22). It is connected to the boiler body (21) through the flue gas pipeline (31). The flue gas duct (3) transports the flue gas generated by the boiler to the chimney (11) for discharge. The air circulation module (4) includes an induced draft unit (41), an exhaust unit (42), and a circulation channel (43). The induced draft unit (41) is located at the top of the main body of the boiler room (1), the exhaust unit (42) is located above the boiler module (2), and the circulation channel (43) is located in the functional chamber (12) and above the flue gas duct (3). The circulation channel (43) is connected to the induced draft unit (41) and the exhaust unit (42). The heat exchange module (5) is located in the functional chamber (12) and includes an evaporation unit (51) and a condensation unit (52). The evaporation unit (51) is located at the junction of the circulation channel (43) and the flue gas channel (3). The evaporation unit (51) performs heat exchange and cooling on the gas in the circulation channel (43) and the flue gas channel (3). The condensation unit (52) is located below the flue gas channel (3) and performs heat exchange with the liquid in the replenishment water tank (22).

2. The boiler room waste heat recovery system according to claim 1, characterized in that: The heat exchange module (5) also includes a waste heat recovery unit (53), which is located between the flue gas pipeline (31) and the flue gas flow channel (3). The waste heat recovery unit (53) is connected to the supplementary water tank (22) through a heat exchange pipeline. The heat exchange pipeline transports the liquid in the supplementary water tank (22) to the waste heat recovery unit (53) to exchange heat with the flue gas and then transports it back to the supplementary water tank (22).

3. The boiler room waste heat recovery system according to claim 2, characterized in that: The supplementary water tank (22) is equipped with an overflow baffle (221), which divides the overflow baffle (221) into a first heat exchange zone (222) and a second heat exchange zone (223). The first heat exchange zone (222) and the second heat exchange zone (223) are connected through an overflow gap at the top of the overflow baffle (221). The first heat exchange zone (222) is connected to an external pipeline. The liquid in the first heat exchange zone (222) exchanges heat with the condensing unit (52). The liquid in the second heat exchange zone (223) enters the waste heat recovery unit (53) through the heat exchange pipeline for heat exchange and returns. The second heat exchange zone (223) is connected to the boiler body (21) through a supplementary pipeline.

4. The boiler room waste heat recovery system according to claim 3, characterized in that: A liquid level sensor is provided in the second heat exchange zone (223).

5. The boiler room waste heat recovery system according to claim 1, characterized in that: The circulation channel (43) includes a conveying section (431) and a bending section (432). The bending section (432) is S-shaped. The two ends of the conveying section (431) are connected to the bottom of the air-drawing unit (41) and the bending section (432), respectively. The other end of the bending section (432) is connected to the air-discharge unit (42). The evaporation unit (51) exchanges heat with the air in the bending section (432).

6. The boiler room waste heat recovery system according to claim 5, characterized in that: The bottom of the bent section (432) is provided with a condensate storage tank, which is connected to the outside through a discharge pipe, and a one-way valve is provided on the discharge pipe.

7. The boiler room waste heat recovery system according to claim 5, characterized in that: The air circulation module (4) further includes a drive unit, which is disposed in the circulation channel (43). The drive unit drives the air in the circulation channel (43) to flow, so that the air in the circulation channel (43) flows from the air intake unit (41) to the air outlet unit (42).

8. The boiler room waste heat recovery system according to claim 7, characterized in that: The drive unit includes an induced draft fan (44) and an expelling fan (45). The induced draft fan (44) is disposed in the conveying section (431), and the expelling fan (45) is disposed in the bending section (432).

9. The boiler room waste heat recovery system according to claim 1, characterized in that: The air intake unit (41) includes an air inlet, a gas collection hood (411) and a collection pipe (412). The air inlets are spaced apart on the top of the main body (1) of the boiler room. The air inlets are connected to the circulation channel (43) through the collection pipe (412). The gas collection hood (411) is located at the air inlet.

10. The boiler room waste heat recovery system according to claim 9, characterized in that: The air outlet unit (42) includes an air outlet duct (421), an air outlet and a diffuser (422). The air outlet duct (421) is located between the air outlet and the circulation channel (43). The air outlet is spaced in the upper middle part of the main body (1) of the boiler room, and the diffuser (422) is located at the air outlet.

Images