Condensing coil steam boiler capable of recycling cooling liquid

Abstract

The utility model discloses a condensing coil steam boiler capable of recycling cooling liquid, which relates to the technical field of steam boilers and comprises a boiler body, a boiler chamber is arranged in the boiler body, a steam coil for water flow to flow is arranged in the boiler chamber, and a burner for heating the steam coil is further arranged at the top of the boiler body. A condenser pipe used for conducting heat exchange on high-temperature flue gas generated during combustion of the combustor is further arranged in the boiler cavity, a cooling liquid circulation assembly used for conveying cooling liquid into the condenser pipe is further arranged outside the boiler body, and the cooling liquid circulation assembly comprises a liquid supply box, a liquid outlet pipe and a liquid outlet pipe, the condenser is provided with a hollow cavity communicated with the condenser pipe. According to the steam boiler, condensate is recycled in a cooling liquid recycling mode, and the energy utilization efficiency of the steam boiler is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam boilers, in particular to a condensing coil steam boiler with circulating coolant. Background Art

[0002] In the operation of steam boilers, burning fuel to produce steam is a core link. In this process, fuel (such as coal, oil, natural gas, etc.) is mixed with air and ignited in the combustion chamber of the boiler, releasing a large amount of heat energy. As the combustion proceeds, high-temperature flue gas containing water vapor, carbon dioxide, nitrogen, incompletely burned fuel gas, and tiny particles is generated. These high-temperature flue gases not only carry a large amount of heat energy, but may also contain substances that are harmful to the environment, such as sulfur oxides, nitrogen oxides, and particulate matter.

[0003] In order to effectively utilize the heat energy in high-temperature flue gas and reduce its pollution to the environment, it is usually necessary to cool the high-temperature flue gas. The traditional cooling method is to exchange heat with a coolant through a heat exchanger to reduce the temperature of the flue gas.

[0004] In the process of existing coolant circulation cooling, the flow rate of the coolant needs to be adjusted according to the temperature of the flue gas. Changes in the flow rate of the coolant will cause water flow fluctuations and water pressure shocks, thereby making the coolant returning to the cooling box unstable. This change will cause bubbles in the coolant returning to the cooling box. A large number of bubbles in the coolant will affect the stability and uniformity of the cooling, and thus affect the flue gas cooling efficiency.

[0005] In view of this, this application is hereby filed. Utility Model Content

[0006] The utility model aims to provide a condensing coil steam boiler with circulating coolant to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the utility model provides a condensing coil steam boiler with circulating coolant, comprising a boiler body, a furnace cavity inside which a steam coil for water flow is arranged inside the furnace cavity, a burner for heating the steam coil is also arranged on the top of the boiler body, a condensing tube for heat exchange with high-temperature flue gas generated by the burner during combustion is also arranged inside the furnace cavity, and the utility model is characterized in that a coolant circulation component for conveying coolant to the inside of the condensing tube is also arranged outside the boiler body,

[0008] The coolant circulation component comprises:

[0009] A liquid supply tank is mounted on the front side wall of the boiler body and has a hollow cavity connected to the condenser pipe;

[0010] A coolant storage tank is installed on the boiler body, and has a storage cavity for storing coolant inside. A circulating pump is installed on the top of the coolant storage tank, and the output end of the circulating pump is connected to a liquid supply pipe for extracting coolant from the coolant storage tank and transporting it to the condenser tube.

[0011] A return conduit is a tubular structure with one end closed and the other end open, wherein the open end is connected to the side wall of the lower part of the coolant storage tank, and the side wall of the upper part of the return conduit is connected to a return pipe connected to the liquid supply tank;

[0012] The bracket is mounted on the inner wall of the open end of the reflux conduit, a rotating shaft is rotatably mounted on the bracket, and an impeller is fixedly mounted on the outer wall of the rotating shaft.

[0013] Furthermore, a sealing bolt is threadedly connected on the end face of the closed end of the return duct, the sealing bolt extends along the length direction of the return duct, and one end of the sealing bolt extending into the interior of the return duct is fixedly connected to a first elastic friction plate, and a second elastic friction plate symmetrically arranged with the first elastic friction plate is fixedly installed on the top end of the rotating shaft.

[0014] Furthermore, it also includes a cooling structure arranged on the side wall of the coolant storage tank for cooling the coolant inside the coolant storage tank.

[0015] The cooling structure comprises:

[0016] A plurality of heat exchange fins are arranged at equal intervals on the side wall of the coolant storage tank and extend transversely to the interior of the coolant storage tank;

[0017] A shield is installed on the side wall of the coolant storage tank and covers the outside of the heat exchange fins;

[0018] The cooling fan is installed inside the hood.

[0019] Furthermore, a dustproof net is installed inside the partition cover, and the dustproof net is located on a side of the partition cover away from the coolant storage tank, and the outer wall of the dustproof net is in contact with the inner wall of the partition cover.

[0020] Furthermore, a guide plate is installed on the inner wall of the reflux conduit, the guide plate is arranged obliquely, and the guide plate is located at the connection between the return liquid pipe and the reflux conduit.

[0021] Furthermore, a plurality of partitions are arranged inside the furnace chamber of the boiler body, and the plurality of partitions are arranged in an up-and-down staggered interval. The furnace chamber of the boiler body is divided into a first heat exchange chamber, a second heat exchange chamber, a third heat exchange chamber and a smoke exhaust chamber that are interconnected by the plurality of partitions. The steam coil is arranged inside the first heat exchange chamber, a reheater is arranged inside the second heat exchange chamber, the condenser is arranged in the third heat exchange chamber, a smoke outlet for discharging smoke inside the smoke exhaust chamber is arranged on the top of the boiler body, and a drain outlet connected to the smoke exhaust chamber is arranged on the side wall of the boiler body.

[0022] Furthermore, a gas supply pipeline for conveying natural gas to the inside of the burner is arranged on the rear side wall of the boiler body, and a steam expansion container for collecting steam generated when the steam coil is heated is also arranged on the side wall of the boiler body.

[0023] Furthermore, a variable frequency fan for conveying gas to the inside of the burner is also arranged on the top wall of the boiler body, and a variable frequency control cabinet for controlling the opening and closing of the burner and the variable frequency fan is arranged on the side wall of the boiler body.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] 1. The utility model can extract the coolant in the coolant storage tank through the circulation pump, and the coolant is transported to the inside of the condenser through the liquid supply pipe. The coolant heated in the condenser will enter the inside of the liquid supply tank, and the heated coolant in the liquid supply tank will flow back to the inside of the coolant storage tank through the return pipe and the reflux duct. The coolant cooled by the coolant storage tank can be transported to the inside of the condenser again to realize the circulation of the coolant. The condensate is recovered and reused by the circulation of the coolant, which effectively improves the energy efficiency of the steam boiler.

[0026] 2. The utility model can make the impeller rotate inside the return duct by arranging a bracket and a rotating shaft inside the return duct, and use the returned coolant to drive the impeller to rotate inside the return duct, which can reduce the flow rate of the coolant returning to the coolant storage tank. The coolant with a low flow rate is relatively stable, which reduces the occurrence of turbulence and eddy currents, thereby reducing the generation of coolant bubbles inside the coolant storage tank, avoiding the influence of bubbles on the heat exchange of the coolant.

[0027] 3. The utility model can move the sealing bolt along the side wall of the return duct by rotating it. During the movement, the sealing bolt can drive the first elastic friction plate to move towards and away from the second elastic friction plate, thereby achieving the effect of adjusting the degree of fit and tightness between the first elastic friction plate and the second elastic friction plate. Under the conditions of coolant with different flow rates and flow rates, the impeller can maintain the best rotation state, thereby realizing maximum energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a front view structural schematic diagram of the utility model;

[0029] Figure 2 It is a rear view structural schematic diagram of the utility model;

[0030] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the coolant circulation component in the utility model;

[0032] Figure 5 It is a cross-sectional structural schematic diagram of the coolant storage box in the utility model;

[0033] Figure 6 It is a schematic diagram of the cross-sectional structure of the reflux conduit in the utility model.

[0034] In the figure: 1. boiler body; 2. burner; 3. frequency conversion fan; 4. smoke outlet; 5. steam expansion tank; 6. air supply pipeline; 7. drain outlet; 8. frequency conversion control cabinet; 9. condenser; 10. liquid supply tank; 11. coolant storage tank; 12. circulation pump; 13. liquid supply pipe; 14. liquid return pipe; 15. partition; 16. partition cover; 17. dust net; 18. cooling fan; 19. heat exchanger; 20. exhaust pipe; 21. return duct; 22. bracket; 23. rotating shaft; 24. impeller; 25. sealing bolt; 26. first elastic friction plate; 27. second elastic friction plate; 28. guide plate; 29. ​​steam coil. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figure 1-6 The utility model provides a technical solution: a condensing coil steam boiler for circulating coolant, comprising a boiler body 1, a furnace cavity inside which is provided with a steam coil 29 for water flow, a burner 2 for heating the steam coil 29 is also provided on the top of the boiler body 1, a condensing tube 9 for heat exchange with high-temperature flue gas generated by the burner 2 during combustion is also provided inside the furnace cavity, and a coolant circulation component for conveying coolant to the inside of the condensing tube 9 is also provided outside the boiler body 1,

[0037] The coolant circulation components include:

[0038] A liquid supply tank 10 is installed on the front side wall of the boiler body 1 and has a hollow cavity connected to the condenser pipe 9;

[0039] A coolant storage tank 11 is installed on the boiler body 1, and has a storage cavity for storing coolant inside. A circulating pump 12 is installed on the top of the coolant storage tank 11. The output end of the circulating pump 12 is connected to a liquid supply pipe 13 for extracting the coolant inside the coolant storage tank 11 and transporting it to the inside of the condenser 9.

[0040] The return conduit 21 is a tubular structure with one end closed and the other end open, and the open end is connected to the side wall of the lower part of the coolant storage tank 11, and the upper side wall of the return conduit 21 is connected to the return pipe 14 connected to the liquid supply tank 10;

[0041] The bracket 22 is mounted on the inner wall of the open end of the reflux conduit 21 . A rotating shaft 23 is rotatably mounted on the bracket 22 , and an impeller 24 is fixedly mounted on the outer wall of the rotating shaft 23 .

[0042] Specifically, the burner 2 ejects a combustion flame into the boiler body 1, and the flue gas acts on the steam coil 29. The high-temperature flue gas heats the water inside the steam coil 29, thereby generating high-temperature steam.

[0043] The high-temperature flue gas is cooled by the condenser 9 and then converted into low-temperature flue gas for discharge. The coolant in the coolant storage tank 11 can be extracted by the circulating pump 12, and the coolant is transported to the inside of the condenser 9 through the liquid supply pipe 13. The coolant heated in the condenser 9 will enter the inside of the liquid supply tank 10. The heated coolant in the liquid supply tank 10 will flow back to the inside of the coolant storage tank 11 through the return pipe 14 and the reflux conduit 21. The coolant cooled by the coolant storage tank 11 can be transported to the inside of the condenser 9 again, realizing the circulation of the coolant. The condensate is recovered and reused by recycling the coolant, which effectively improves the energy efficiency of the steam boiler.

[0044] The impact force of the coolant entering the bracket 22 from the return pipe 14 will act on the impeller 24. The bracket 22 and the rotating shaft 23 arranged inside the return duct 21 can make the impeller 24 rotate inside the return duct 21, and the return coolant is used to drive the impeller 24 to rotate inside the return duct 21, which can reduce the flow rate of the coolant returning to the coolant storage tank 11. The coolant with a low flow rate is relatively stable, which reduces the occurrence of turbulence and eddy currents, thereby reducing the generation of coolant bubbles inside the coolant storage tank 11, avoiding the influence of bubbles on the heat exchange of the coolant.

[0045] See also Figure 4 and Figure 6A sealing bolt 25 is threadedly connected to the end surface of the closed end of the return duct 21, and the sealing bolt 25 extends along the length direction of the return duct 21. One end of the sealing bolt 25 extending into the interior of the return duct 21 is fixedly connected to a first elastic friction plate 26, and a second elastic friction plate 27 symmetrically arranged with the first elastic friction plate 26 is fixedly installed on the top of the rotating shaft 23.

[0046] Specifically, the sealing bolt 25 can be rotated to move along the side wall of the return duct 21. During the movement, the sealing bolt 25 can drive the first elastic friction plate 26 to move closer to and away from the second elastic friction plate 27, thereby achieving the effect of adjusting the fit and tightness between the first elastic friction plate 26 and the second elastic friction plate 27. Under the conditions of coolant with different flow rates and flow rates, the impeller 24 can maintain the optimal rotation state, thereby maximizing the utilization of energy.

[0047] See also Figure 1 , Figure 4 and Figure 5 , and also includes a cooling structure disposed on the side wall of the coolant storage tank 11 for cooling the coolant inside the coolant storage tank 11,

[0048] The cooling structure includes:

[0049] A plurality of heat exchange fins 19 are arranged equidistantly on the side wall of the coolant storage tank 11 and extend transversely to the interior of the coolant storage tank 11;

[0050] The shield 16 is installed on the side wall of the coolant storage tank 11 and covers the outside of the heat exchange fins 19;

[0051] The heat dissipation fan 18 is installed inside the partition cover 16 .

[0052] Specifically, the temperature of the coolant inside the coolant storage tank 11 can be transferred to the outside of the coolant storage tank 11 through the heat exchange plate 19, and the air inside the partition 16 can be exchanged with the outside through the heat dissipation fan 18. Then, the coolant inside the coolant storage tank 11 can be fully cooled by the cooperation of the heat dissipation fan 18 and the heat exchange plate 19, so as to avoid the coolant temperature being too high and affecting the condensation effect.

[0053] It should be noted that an exhaust pipe 20 is also provided on the side wall of the coolant storage tank 11 , and a one-way valve is provided inside the exhaust pipe 20 , so that the gas inside the coolant storage tank 11 can be discharged through the exhaust pipe 20 .

[0054] See also Figure 4 and Figure 5 A dustproof net 17 is installed inside the partition cover 16 . The dustproof net 17 is located on a side of the partition cover 16 away from the coolant storage tank 11 . The outer wall of the dustproof net 17 is in contact with the inner wall of the partition cover 16 .

[0055] Specifically, the dustproof net 17 can prevent external dust from adhering to the heat exchange fins 19 and affecting the heat conduction of the heat exchange fins 19 .

[0056] See also Figure 6 A guide plate 28 is installed on the inner wall of the reflux conduit 21 . The guide plate 28 is inclined and is located at the connection between the liquid return pipe 14 and the reflux conduit 21 .

[0057] Specifically, the coolant returning from the return pipe 14 can be guided by the guide plate 28 , thereby partially reducing the impact force of the returning coolant, while ensuring that the returning coolant completely acts on the impeller 24 .

[0058] See also Figure 1-Figure 3 A plurality of partitions 15 are arranged inside the furnace chamber of the boiler body 1, and the plurality of partitions 15 are arranged in an up-and-down staggered interval. The furnace chamber of the boiler body 1 is divided into a first heat exchange chamber, a second heat exchange chamber, a third heat exchange chamber and a smoke exhaust chamber which are interconnected by the plurality of partitions 15. The steam coil 29 is arranged inside the first heat exchange chamber, a reheater is arranged inside the second heat exchange chamber, and the condenser 9 is arranged in the third heat exchange chamber. A smoke outlet 4 for discharging smoke inside the smoke exhaust chamber is arranged on the top of the boiler body 1, and a drain port 7 communicating with the smoke exhaust chamber is arranged on the side wall of the boiler body 1; a gas supply pipeline 6 for conveying natural gas to the inside of the burner 2 is arranged on the rear side wall of the boiler body 1, and a steam expansion container 5 for collecting steam generated when the steam coil 29 is heated is also arranged on the side wall of the boiler body 1.

[0059] Specifically, natural gas can be transported to the interior of the burner 2 through the gas supply pipeline 6 to meet combustion conditions, and then the burner 2 sprays a combustion flame into the interior of the boiler body 1. The flue gas passes through the first heat exchange chamber composed of the steam coil 29, and is folded into the outer circle of the steam coil 29 from the lower part of the inner circle of the steam coil 29 to form a convection flue. The high-temperature flue gas is fully utilized through the convection flue to heat the water inside the steam coil 29, and then high-temperature steam is generated. The high-temperature steam is discharged after passing through the interior of the steam expansion tank 5 for use in industrial production. The flue gas discharged from the first heat exchange chamber is separated by the partition 15 and enters the second heat exchange chamber. The flue gas enters the reheater (not shown) from the lower part of the boiler body 1 along the second heat exchange chamber, and then passes through the upper part of the boiler body 1 to enter the third heat exchange chamber. The flue gas is cooled by the condenser 9 and the coolant circulation component. The cooled flue gas is discharged through the exhaust chamber and the smoke outlet 4 to achieve an ultra-low exhaust temperature.

[0060] See also Figure 1-Figure 3 A variable frequency fan 3 for conveying gas to the inside of the burner 2 is also arranged on the top wall of the boiler body 1, and a variable frequency control cabinet 8 for controlling the opening and closing of the burner 2 and the variable frequency fan 3 is arranged on the side wall of the boiler body 1.

[0061] Specifically, the variable frequency fan 3 can deliver combustion-supporting gas to the interior of the burner 2, thereby facilitating the control of the combustion heat level of the burner 2. The variable frequency control cabinet 8 allows the operator to control the opening and closing of the burner 2 and the variable frequency fan 3, further improving the degree of automation in the use of the boiler body 1.

[0062] Working principle: Natural gas can be transported to the inside of the burner 2 through the gas supply pipeline 6 to meet the combustion conditions, and then the burner 2 sprays a combustion flame into the boiler body 1. The flue gas passes through the first heat exchange chamber composed of the steam coil 29, and is folded into the outer circle of the steam coil 29 from the lower part of the inner circle of the steam coil 29 to form a convection flue. The high-temperature flue gas is fully utilized through the convection flue to heat the water inside the steam coil 29, and then high-temperature steam is generated. The high-temperature steam is discharged after passing through the inside of the steam expansion tank 5 for use in industrial production. The flue gas discharged from the first heat exchange chamber is separated by the partition 15 and enters the second heat exchange chamber. The flue gas enters the reheater (not shown in the figure) from the lower part of the boiler body 1 along the second heat exchange chamber, and then enters the third heat exchange chamber after passing through the upper part of the boiler body 1. The heat exchange chamber cools down the flue gas through the cooperation of the condenser 9 and the coolant circulation component, and the cooled flue gas is discharged through the exhaust chamber and the smoke outlet 4 to achieve an ultra-low exhaust temperature; the coolant in the coolant storage tank 11 can be extracted by the circulating pump 12, and the coolant is transported to the condenser 9 through the liquid supply pipe 13. The heated coolant in the condenser 9 will enter the liquid supply tank 10, and the heated coolant in the liquid supply tank 10 will flow back to the coolant storage tank 11 through the return pipe 14 and the reflux duct 21. The coolant cooled by the coolant storage tank 11 can be transported to the condenser 9 again to achieve the circulation of the coolant. The condensate is recovered and reused by the circulation of the coolant, which effectively improves the energy efficiency of the steam boiler.

Claims

1. A condensing coil steam boiler for circulating coolant, comprising a boiler body (1), a furnace chamber inside the boiler body, a steam coil (29) for water flow inside the furnace chamber, a burner (2) for heating the steam coil (29) on the top of the boiler body (1), a condensing tube (9) for heat exchange with high-temperature flue gas generated by the burner (2) when burning, and characterized in that: The boiler body (1) is also provided with a cooling liquid circulation assembly for conveying cooling liquid to the inside of the condenser tube (9). The coolant circulation component comprises: A liquid supply tank (10) is installed on the front side wall of the boiler body (1) and has a hollow cavity connected to the condenser pipe (9); A coolant storage tank (11) is installed on the boiler body (1), and has a storage cavity for storing coolant inside. A circulating pump (12) is installed on the top of the coolant storage tank. The output end of the circulating pump (12) is connected to a liquid supply pipe (13) for extracting coolant from the coolant storage tank (11) and transporting it to the inside of the condenser (9). A return conduit (21) is a tubular structure with one end closed and the other end open, wherein the open end is connected to the side wall of the lower portion of the cooling liquid storage tank (11), and the upper portion of the return conduit (21) is connected to a return pipe (14) in communication with the liquid supply tank (10); The bracket (22) is mounted on the inner wall of the open end of the return conduit (21), a rotating shaft (23) is rotatably mounted on the bracket (22), and an impeller (24) is fixedly mounted on the outer wall of the rotating shaft (23).

2. The condensing coil steam boiler with cooling liquid recycling as claimed in claim 1, characterized in that: A sealing bolt (25) is threadedly connected to the end surface of the closed end of the return duct (21). The sealing bolt (25) extends along the length direction of the return duct (21), and one end of the sealing bolt (25) extending to the inside of the return duct (21) is fixedly connected to a first elastic friction plate (26). A second elastic friction plate (27) symmetrically arranged with the first elastic friction plate (26) is fixedly installed at the top end of the rotating shaft (23).

3. The condensing coil steam boiler with cooling liquid recycling as claimed in claim 1, characterized in that: It also includes a cooling structure arranged on the side wall of the coolant storage box (11) for cooling the coolant inside the coolant storage box. The cooling structure comprises: A plurality of heat exchange fins (19) are arranged at equal intervals on the side wall of the coolant storage tank (11) and extend transversely to the interior of the coolant storage tank (11); A shield (16) is installed on the side wall of the coolant storage tank (11) and covers the outside of the heat exchange fins (19); The heat dissipation fan (18) is installed inside the partition cover (16).

4. The condensing coil steam boiler with cooling liquid recycling as claimed in claim 3, characterized in that: A dustproof net (17) is installed inside the partition cover (16). The dustproof net (17) is located on a side of the partition cover (16) away from the coolant storage tank (11), and the outer wall of the dustproof net (17) is in contact with the inner wall of the partition cover (16).

5. The condensing coil steam boiler with cooling liquid recycling as claimed in claim 1, characterized in that: A guide plate (28) is installed on the inner wall of the reflux conduit (21). The guide plate (28) is arranged obliquely. The guide plate (28) is located at the connection between the liquid return pipe (14) and the reflux conduit (21).

6. The condensing coil steam boiler with cooling liquid recycling as claimed in claim 1, characterized in that: A plurality of partitions (15) are arranged inside the furnace chamber of the boiler body (1), and the plurality of partitions (15) are arranged in an up-and-down staggered manner. The furnace chamber of the boiler body (1) is divided into a first heat exchange chamber, a second heat exchange chamber, a third heat exchange chamber and a smoke exhaust chamber which are interconnected by the plurality of partitions (15). The steam coil (29) is arranged inside the first heat exchange chamber, a reheater is arranged inside the second heat exchange chamber, and the condenser (9) is arranged in the third heat exchange chamber. A smoke outlet (4) for discharging smoke from the smoke exhaust chamber is arranged on the top of the boiler body (1), and a drain port (7) which is connected to the smoke exhaust chamber is arranged on the side wall of the boiler body (1).

7. The condensing coil steam boiler with cooling liquid recycling as claimed in claim 1, characterized in that: A gas supply pipeline (6) for conveying natural gas to the inside of the burner (2) is arranged on the rear side wall of the boiler body (1), and a steam expansion container (5) for collecting steam generated when the steam coil (29) is heated is also arranged on the side wall of the boiler body (1).

8. The condensing coil steam boiler with cooling liquid recycling as claimed in claim 1, characterized in that: A variable frequency fan (3) for conveying gas to the inside of the burner (2) is also arranged on the top wall of the boiler body (1), and a variable frequency control cabinet (8) for controlling the opening and closing of the burner (2) and the variable frequency fan (3) is arranged on the side wall of the boiler body (1).

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