Boiler water supply system for preventing low-temperature corrosion of glass kiln
By combining a low-pressure evaporation system and a feedwater regulation and preheating system, the problem of low-temperature corrosion in glass kiln boilers was solved, and the efficient utilization of low-temperature waste heat and the improvement of thermal efficiency were achieved.
Patent Information
- Application Number
- CN202520158869.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-23
AI Technical Summary
Existing glass kiln boilers suffer from low-temperature corrosion in the low-temperature section, and the low-temperature waste heat is not effectively utilized, resulting in high system complexity and low thermal efficiency.
A low-pressure evaporation system and a feedwater conditioning and preheating system are adopted. The feedwater temperature is regulated by a combination of heat exchangers and condensate heaters to avoid low-temperature corrosion, and low-temperature waste heat is used to generate external low-pressure steam.
This approach achieves the goal of maximizing the utilization of low-temperature waste heat while avoiding low-temperature corrosion, reducing system complexity, improving thermal efficiency, and simplifying operation procedures.
Smart Images
Figure CN223709601U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water supply system technology, specifically a boiler water supply system for glass kilns to prevent low-temperature corrosion. Background Technology
[0002] Traditional glass kiln flue gas treatment processes involve medium-temperature denitrification (350–380℃) followed by low-temperature desulfurization (160–200℃). This results in flue gas entering the boilers at both high and low temperatures having the same sulfur content (≥500 mg / Nm³). 3 The working fluid temperature inside the boiler's tail-end tubes needs to be higher than the sulfuric acid condensation temperature (≥120℃) to prevent acid corrosion on the outer wall of the tubes and subsequent tube rupture. Therefore, the flue gas temperature of conventional glass waste heat boilers is generally above 160℃, and the tail-end waste heat is not fully utilized. With the upgrading of glass kiln flue gas treatment technology to integrate dust, nitrogen, and sulfur treatment, the flue gas after medium-temperature treatment is introduced into the low-temperature section boiler as clean flue gas with a sulfur content of less than 50mg / Nm³. 3 Low-temperature corrosion on the boiler's tail-end heating surfaces has been significantly reduced, and the utilization of low-temperature waste heat in the 120-160℃ range is increasingly valued by glass factories. Therefore, ensuring the prevention of low-temperature corrosion while maximizing the utilization of low-temperature waste heat at the tail end has become an urgent problem for glass factories to solve. Utility Model Content
[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a boiler feedwater system for glass kilns to prevent low-temperature corrosion. It also provides a feedwater regulation and preheating system to ensure the working fluid temperature of the furnace tubes, prevent low-temperature corrosion, and is easy to operate, reduces system complexity, has high heat exchange efficiency, and is highly applicable.
[0004] The purpose of this utility model is achieved through the following technical solution: a boiler feedwater system for preventing low-temperature corrosion in glass kilns. The feedwater system includes a low-pressure evaporation system and a feedwater regulating and preheating system. The low-pressure evaporation system includes a low-pressure evaporator, an external steam supply pipe, and a deaerator / low-pressure boiler drum. The deaerator / low-pressure boiler drum is connected to the low-pressure evaporator and the external steam supply pipe, respectively. A heat exchanger is installed inside the deaerator / low-pressure boiler drum. The feedwater regulating and preheating system includes a condensate pump and a condensate heater. The heat exchanger is connected to the condensate pump and the condensate heater, respectively. The condensate heater is connected to the deaerator / low-pressure boiler drum. The heat absorbed by the low-pressure evaporation system is stored inside the deaerator / low-pressure boiler drum and contacts the coil of the heat exchanger, releasing heat to the heat exchanger. Cold water from the condensate pump enters the heat exchanger to absorb heat. After absorbing heat, the hot water enters the condensate heater to continue absorbing heat and then enters the deaerator / low-pressure boiler drum.
[0005] The deaerator, which is also the low-pressure boiler drum, is connected to the low-pressure evaporator via a downcomer and an upcomer.
[0006] The heat exchanger and the condensate pump are connected through the first inlet water pipe.
[0007] The condensate heater is provided with an inlet and an outlet. The inlet is connected to the heat exchanger through a first outlet pipe, and the outlet is connected to the deaerator and low-pressure boiler drum through a second outlet pipe. The inlet and outlet are respectively provided with a first shut-off valve and a second shut-off valve.
[0008] The second water outlet pipe is connected to the first water outlet pipe through a first connecting pipe, and a third shut-off valve is installed on the first connecting pipe. When the condensate heater fails, the first shut-off valve and the second shut-off valve are closed, and the third shut-off valve is opened to disconnect the system.
[0009] The first inlet pipe and the first outlet pipe are connected by a mixing pipe. A fourth shut-off valve is installed on the mixing pipe. When the temperature of the water detected by the temperature sensing element is too high, the fourth shut-off valve is slightly opened to adjust the temperature and ensure that the temperature of the section of the pipe where the temperature sensing element is located is between 80 and 90°C.
[0010] A temperature measuring element is installed on the first outlet pipe, and one end of the section of pipe where the temperature measuring element is located is connected to the first connecting pipe and the other end is connected to the mixing pipe. The temperature measuring element monitors in real time, and when the hot water from the heat exchanger reaches the required temperature, it is put into the condensate heater to continue absorbing heat.
[0011] The section of pipe where the temperature sensing element is located is also equipped with a pressure sensing element for detecting pressure.
[0012] A fifth shut-off valve is installed at the inlet of the heat exchanger, and a sixth shut-off valve is installed at the outlet of the heat exchanger. When the heat exchanger malfunctions, the fifth and sixth shut-off valves can be closed, and the fourth shut-off valve can be opened for disconnection operation.
[0013] Preferably, the heat exchanger adopts a coil structure, which is simple in structure, has a low failure rate, and high heat exchange efficiency.
[0014] The beneficial effects of this utility model are:
[0015] 1. This utility model adopts a heat exchanger + condensate heater configuration, which maximizes the utilization of low-temperature waste heat while avoiding low-temperature corrosion at the tail of the boiler, and can meet the demand for external supply of low-pressure steam. Moreover, this system is different from ordinary hot water recirculation system, with high heat exchange efficiency, no need to add power-consuming equipment hot water recirculation pump, reducing system complexity, simplifying operation, and improving the overall thermal efficiency of power plant.
[0016] 2. This utility model can adjust the working fluid temperature in the section of the pipe where the temperature measuring element is located by adjusting the fourth shut-off valve, thereby adjusting the working fluid temperature at the inlet of the condensate heater to avoid the temperature of flue gas condensation corrosion.
[0017] 3. The heat exchanger of this utility model adopts a coil structure, which is simple in structure, has a low failure rate, and high heat exchange efficiency. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model;
[0019] In the diagram: 1-Condensate pump, 2-Deaerator and low-pressure boiler drum, 3-Heat exchanger, 4-Low-pressure evaporator, 5-Condensate heater, 6-Temperature sensing element, 7-Fourth shut-off valve, 8-Third shut-off valve, 9-Fifth shut-off valve, 10-Sixth shut-off valve, 11-First shut-off valve, 12-Second shut-off valve, 13-Rising pipe, 14-Downflow pipe, 15-First outlet pipe, 16-External steam supply pipe, 17-First inlet pipe, 18-Mixing pipe, 19-Second outlet pipe, 20-First connecting pipe. Detailed Implementation
[0020] 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, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0022] In one embodiment of this application:
[0023] like Figure 1As shown, a boiler feedwater system for preventing low-temperature corrosion in a glass kiln includes a low-pressure evaporation system and a feedwater regulating and preheating system. The low-pressure evaporation system includes a low-pressure evaporator 4, an external steam supply pipe 16, and a deaerator / low-pressure boiler drum 2. The deaerator / low-pressure boiler drum 2 is connected to the low-pressure evaporator 4 via a downcomer 14 and an upcomer 13. The deaerator / low-pressure boiler drum 2 is connected to the external steam supply pipe 16. A heat exchanger 3 is installed inside the deaerator / low-pressure boiler drum 2. The feedwater regulating and preheating system includes a condensate pump 1 and a condensate heater 5. The heat exchanger 3 is connected to the condensate pump 1 via a first inlet pipe 17. The condensate heater 5 is provided with an inlet and an outlet. The inlet is connected to the heat exchanger 3 via a first outlet pipe 15, and the outlet is connected to the deaerator / low-pressure boiler drum 2 via a second outlet pipe 19. A temperature measuring element 6 is installed on the first outlet pipe 15. During normal operation, cold water from condensate pump 1 enters heat exchanger 3 through first inlet pipe 17 to absorb heat. After absorbing heat, it is detected by temperature measuring element 6 on first outlet pipe 15. If the monitored temperature is ≥80℃, it enters condensate heater 5 to absorb heat. After absorbing heat, it enters deaerator and low-pressure boiler drum 2 through second outlet pipe 19 for deoxygenation. After deoxygenation, it enters low-pressure evaporator 4 through downcomer 14 to generate steam. The steam rises along riser pipe 13 into deaerator and low-pressure boiler drum 2, and is then supplied externally through external steam supply pipe 16.
[0024] In another embodiment of this application:
[0025] Based on the previous embodiment, this embodiment improves the inlet, outlet and pipe, and the inlet and outlet are respectively equipped with a first shut-off valve 11 and a second shut-off valve 12.
[0026] The second water outlet pipe 19 is connected to the first water outlet pipe 15 through the first connecting pipe 20, and the first connecting pipe 20 is equipped with a third shut-off valve 8.
[0027] The first inlet pipe 17 and the first outlet pipe 15 are connected by a mixing pipe 18, which is equipped with a fourth shut-off valve 7. When the temperature sensing element 6 detects that the water temperature is too high, the fourth shut-off valve 7 is slightly opened to adjust the temperature and ensure that the temperature of the section of pipe where the temperature sensing element 6 is located is between 80 and 90°C.
[0028] One end of the pipe where the temperature sensing element 6 is located is connected to the first connecting pipe 20, and the other end is connected to the mixing pipe 18.
[0029] The section of pipe where temperature sensing element 6 is located is also equipped with pressure sensing elements for detecting pressure.
[0030] A fifth shut-off valve 9 is installed at the inlet of heat exchanger 3, and a sixth shut-off valve 10 is installed at the outlet of heat exchanger 3. During normal operation, the fifth shut-off valve 9 and the sixth shut-off valve 10 are normally open, while the first shut-off valve 11, the second shut-off valve 12, the fourth shut-off valve 7, and the third shut-off valve 8 are normally closed. Cold water from the condensate pump 1 enters the heat exchanger 3 through the first inlet pipe 17 to absorb heat. After heat absorption, it is detected by the temperature sensing element 6 on the first outlet pipe 15. If the monitored temperature is ≥80℃, the first shut-off valve 11 and the second shut-off valve 12 are opened to enter the condensate heater 5 to absorb heat. After heat absorption, it enters the deaerator and low-pressure boiler drum 2 through the second outlet pipe 19 for deoxygenation. After deoxygenation, it enters the low-pressure evaporator 4 through the downcomer 14 to generate steam. The steam rises along the riser pipe 13 and enters the deaerator and low-pressure boiler drum 2, and is then supplied externally through the external steam supply pipe 16. When the heat exchanger 3 malfunctions, the fifth shut-off valve 9 and the sixth shut-off valve 10 can be closed, and the fourth shut-off valve 7 can be opened for disconnected operation. That is, the cold water from the condensate pump 1 enters the first inlet pipe 17, the mixing pipe 18, and the first outlet pipe 15. The water outlet pipe 15 enters the condensate heater 5 to absorb heat. After absorbing heat, it enters the deaerator and low-pressure boiler drum 2 through the second water outlet pipe 19 for deaeration. After deaeration, it enters the low-pressure evaporator 4 through the downcomer 14 to generate steam. The steam rises along the riser pipe 13 into the deaerator and low-pressure boiler drum 2, and is then supplied to the outside through the external steam supply pipe 16. When the condensate heater 5 malfunctions, the first shut-off valve 11 and the second shut-off valve 12 are closed, and the third shut-off valve 8 is opened for disconnection operation. That is, the cold water from the condensate pump 1 enters the heat exchanger 3 through the first inlet pipe 17 to absorb heat. After absorbing heat, it is detected by the temperature measuring element 6 on the first water outlet pipe 15. If the monitored temperature is ≥80℃, it enters the deaerator and low-pressure boiler drum 2 through the first connecting pipe 20 and the second water outlet pipe 19 for deaeration. After deaeration, it enters the low-pressure evaporator 4 through the downcomer 14 to generate steam. The steam rises along the riser pipe 13 into the deaerator and low-pressure boiler drum 2, and is then supplied to the outside through the external steam supply pipe 16.
[0031] Heat exchanger 3 adopts a coil structure, which is simple in structure, has a low failure rate, and high heat exchange efficiency.
[0032] The above description is merely an embodiment of this utility model. It should be understood that this utility model is not limited to the form disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.
Claims
1. A boiler feedwater system for preventing low-temperature corrosion in glass furnaces, characterized in that: The system includes a low-pressure evaporation system and a feedwater regulation and preheating system. The low-pressure evaporation system includes a low-pressure evaporator (4), an external steam supply pipe (16), and a deaerator and low-pressure boiler drum (2). The deaerator and low-pressure boiler drum (2) is connected to the low-pressure evaporator (4) and the external steam supply pipe (16). A heat exchanger (3) is installed inside the deaerator and low-pressure boiler drum (2). The feedwater regulation and preheating system includes a condensate pump (1) and a condensate heater (5). The heat exchanger (3) is connected to the condensate pump (1) and the condensate heater (5). The condensate heater (5) is connected to the deaerator and low-pressure boiler drum (2).
2. The boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 1, characterized in that: The deaerator and low-pressure boiler drum (2) is connected to the low-pressure evaporator (4) through a downcomer (14) and an ascender (13).
3. The boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 1, characterized in that: The heat exchanger (3) is connected to the condensate pump (1) through the first inlet pipe (17).
4. A boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 3, characterized in that: The condensate heater (5) is provided with an inlet and an outlet. The inlet is connected to the heat exchanger (3) through a first outlet pipe (15), and the outlet is connected to the deaerator and low-pressure boiler drum (2) through a second outlet pipe (19). The inlet and outlet are respectively provided with a first shut-off valve (11) and a second shut-off valve (12).
5. A boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 4, characterized in that: The second water outlet pipe (19) is connected to the first water outlet pipe (15) through the first connecting pipe (20), and the first connecting pipe (20) is equipped with a third shut-off valve (8).
6. A boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to any one of claims 4-5, characterized in that: The first water inlet pipe (17) and the first water outlet pipe (15) are connected through a mixing pipe (18), and a fourth shut-off valve (7) is provided on the mixing pipe (18).
7. A boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 6, characterized in that: A temperature measuring element (6) is provided on the first water outlet pipe (15), and one end of the section of pipe where the temperature measuring element (6) is located is connected to the first connecting pipe (20), and the other end is connected to the mixing pipe (18).
8. A boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 7, characterized in that: The section of pipe where the temperature measuring element (6) is located is also equipped with a pressure measuring element.
9. A boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 6, characterized in that: A fifth shut-off valve (9) is provided at the inlet of the heat exchanger (3), and a sixth shut-off valve (10) is provided at the outlet of the heat exchanger (3).
10. A boiler feedwater system for preventing low-temperature corrosion in a glass furnace according to claim 1, characterized in that: The heat exchanger (3) is arranged in a coil structure.