A fully protected oxygen supply system for thermal power plant boilers
By using a fully protected oxygen supply system for thermal power plant boilers, oxygen is precisely supplied through dissolved oxygen tanks and supply pumps, solving the problem of inefficient oxygen reuse, achieving efficient oxygen utilization and pipeline corrosion protection, reducing operating costs and ensuring system safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU DATANG INT LUSIGANG POWER GENERATION
- Filing Date
- 2025-01-23
- Publication Date
- 2026-06-30
AI Technical Summary
Oxygen in the boiler system of thermal power plants is not being reused properly, which increases operating costs and makes the pipelines susceptible to corrosion. The existing oxygen supply points are not distributed properly, which affects the safety of the system.
Design a fully protected oxygen supply system for thermal power plant boilers, including an oxygen tank, a supply pump, and oxygen supply pipelines. The system prepares oxygenated demineralized water through the oxygen tank, provides precise oxygen supply through multiple oxygen supply points, and is equipped with a backup pump, detection equipment, and a temperature control system to achieve efficient oxygen utilization and corrosion protection of the pipelines.
It achieves efficient utilization of oxygen, reduces operating costs, ensures the stability and safety of boiler system pipelines, avoids corrosion problems, and the system has a backup pump for continuous operation.
Smart Images
Figure CN224430340U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of thermal power boiler technology, and in particular relates to a fully protected oxygen supply system for thermal power plant boilers. Background Technology
[0002] For thermal power plants, the boiler feedwater system typically requires multiple oxygenation points for oxygenation treatment. This prevents scaling and corrosion on the inner walls of the pipes, which is beneficial to the safe operation of the boiler system. Currently, the main oxygenation points in the boiler system are the outlet of the condensate treatment equipment and the suction side of the feedwater pump. Boiler oxygenation currently mostly involves mixing oxygen cylinders with demineralized water to form oxygen-enriched water, which is then pumped to the oxygenation points. This requires thermal power plants to store oxygen for long-term backup. The boiler system itself has a deaerator to deoxygenate the demineralized water, which discharges relatively high-purity oxygen. Currently, most of this oxygen is directly discharged and not properly reused, which increases the operating costs of the power plant. Utility Model Content
[0003] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a fully protective oxygen supply system for thermal power plant boilers that has a simple structure and can accurately add oxygen to each oxygen supply point of the boiler system to avoid corrosion of the pipelines of the boiler system.
[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A fully protected oxygenation system for a thermal power plant boiler includes a dissolved oxygen tank, a supply pump, and multiple oxygenation pipelines. The dissolved oxygen tank has a water inlet, an oxygenation outlet, and a water outlet. The water inlet is used to add demineralized water into the dissolved oxygen tank, and the oxygenation outlet is used to introduce oxygen into the dissolved oxygen tank. The water outlet is connected to one end of the multiple oxygenation pipelines through the supply pump. The multiple oxygenation pipelines correspond one-to-one with multiple oxygenation points in the thermal power plant boiler system. The other end of each oxygenation pipeline is connected to and communicates with the corresponding oxygenation point. A first pressure reducing valve, a first check valve, and a first valve are provided on the oxygenation pipelines.
[0005] The beneficial effects of the above technical solution are as follows: oxygen-containing demineralized water can be prepared by dissolving oxygen tank, and then the demineralized water is transported to the corresponding oxygenation point of the boiler system of the thermal power plant through the supply pump and oxygenation pipeline. By supplying oxygen-containing demineralized water to the oxygenation point of the boiler system of the thermal power plant, the stability of the oxide film on the inner wall of the pipeline of the boiler system of the thermal power plant can be maintained, thereby achieving anti-corrosion protection of the pipeline.
[0006] The above technical solution includes two supply pumps, which are connected in parallel.
[0007] The beneficial effect of the above technical solution is that by setting up two supply pumps, one of the supply pumps can be used as a standby pump.
[0008] The above technical solution describes a second valve at both the inlet and outlet ends of the pump.
[0009] The beneficial effect of the above technical solution is that if any one of the supply pumps is damaged, it can be removed for maintenance without affecting the normal operation of the entire protective oxygen supply system of the thermal power plant boiler.
[0010] The dissolved oxygen tank described in the above technical solution is equipped with a first dissolved oxygen rate detection device, and the sensing end of the first dissolved oxygen rate detection device is located inside the dissolved oxygen tank.
[0011] The beneficial effect of the above technical solution is that the oxygen content of the demineralized water in the dissolved oxygen tank can be monitored by the first dissolved oxygen rate detection device.
[0012] In the above technical solution, a second dissolved oxygen rate detection device is installed downstream of each oxygenation point.
[0013] The beneficial effect of the above technical solution is that the oxygen content at each oxygenation point can be monitored by a second dissolved oxygen rate detection device.
[0014] The dissolved oxygen tank described in the above technical solution is equipped with a temperature monitoring element for monitoring the internal water temperature. A cooling jacket is provided on the outer wall of the dissolved oxygen tank. The cooling jacket has a coolant inlet and a coolant outlet. Coolant is introduced into the cooling jacket to regulate the temperature of the demineralized water in the dissolved oxygen tank.
[0015] The beneficial effects of the above technical solution are as follows: the water temperature in the dissolved oxygen tank can be monitored in real time through the temperature monitoring element, and coolant can be circulated into the cooling jacket to adjust the water temperature in the dissolved oxygen tank.
[0016] The above technical solution provides three oxygen supply ports, namely a first oxygen supply port, a second oxygen supply port, and a third oxygen supply port. The first oxygen supply port is used to introduce hydrogen peroxide solution, the second oxygen supply port is used to connect to an oxygen cylinder, and the third oxygen supply port is used to connect to the oxygen discharge port of the deaerator of the boiler system in a thermal power plant. Each of the three oxygen supply ports is equipped with a third valve, a second pressure reducing valve, and a second check valve.
[0017] The beneficial effect of the above technical solution is that different types of oxygen or oxygen from different sources can be added to the dissolved oxygen tank as needed.
[0018] The water inlet in the above technical solution is used to connect with the demineralized water pipe, and a fourth valve, a third pressure reducing valve and a third check valve are provided at the water inlet.
[0019] The beneficial effect of the above technical solution is that it allows the demineralized water source of the dissolved oxygen tank to be consistent with that of the boiler, thus reducing the investment in equipment.
[0020] The dissolved oxygen tank described in the above technical solution is equipped with a liquid level monitoring device.
[0021] The beneficial effect of the above technical solution is that the liquid level in the dissolved oxygen tank can be monitored by the liquid level monitoring device, so as to regulate the dissolved oxygen rate in the dissolved oxygen tank to a dynamic balance.
[0022] The above technical solution also includes a controller and an alarm, both of which are electrically connected to the controller.
[0023] The beneficial effect of the above technical solution is that when the liquid level in the dissolved oxygen tank is low, the controller can control the alarm to issue an alarm signal to remind the staff that the inflow of demineralized water into the dissolved oxygen tank needs to be increased. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of the fully protected oxygen supply system for a thermal power plant boiler as described in an embodiment of this utility model;
[0025] Figure 2 This is a schematic diagram of the dissolved oxygen tank described in an embodiment of the present invention;
[0026] Figure 3 This is a schematic diagram of the electrical connections of the controller described in an embodiment of this utility model.
[0027] In the diagram: 1. Dissolved oxygen tank; 11. Water inlet; 111. Fourth valve; 112. Third pressure reducing valve; 113. Third check valve; 12. Oxygen inlet; 12a. First oxygen inlet; 12b. Second oxygen inlet; 12c. Third oxygen inlet; 121. Third valve; 122. Second pressure reducing valve; 123. Second check valve; 13. Water outlet; 14. Temperature monitoring element; 15. Cooling jacket; 16. Liquid level monitoring element; 17. Drain outlet; 171. Sewage valve; 2. Supply pump; 21. Second valve; 3. Oxygen supply pipeline; 31. First pressure reducing valve; 32. First check valve; 33. First valve; 4. First dissolved oxygen rate detection device; 5. Second dissolved oxygen rate detection device; 61. Oxygen supply point; 62. Deaerator; 7. Controller; 8. Alarm. Detailed Implementation
[0028] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.
[0029] like Figure 1 and Figure 2 As shown, this embodiment provides a fully protected oxygenation system for a thermal power plant boiler, including an oxygen tank 1, a supply pump 2, and multiple oxygenation pipelines 3. The oxygen tank 1 has a water inlet 11, an oxygen inlet 12, and a water outlet 13. The water inlet 11 is used to add demineralized water into the oxygen tank 1, the oxygen inlet 12 is used to introduce oxygen into the oxygen tank 1, and the water outlet 13 is connected to one end of the multiple oxygenation pipelines 3 through the supply pump 2. The multiple oxygenation pipelines 3 correspond one-to-one with multiple oxygenation points 61 of the thermal power plant boiler system. The other end of the oxygenation pipeline 3 is used to connect and communicate with the corresponding oxygenation point 61. The oxygenation pipeline 3 is equipped with a first pressure reducing valve 31, a first check valve 32, and a first valve 33. In this way, oxygen-containing demineralized water can be prepared through the dissolved oxygen tank. At this time, the demineralized water is then transported to the corresponding oxygenation point of the thermal power plant boiler system through the supply pump and the oxygenation pipeline. By supplying oxygen-containing demineralized water to the oxygenation point of the thermal power plant boiler system, the stability of the oxide film on the inner wall of the pipeline of the thermal power plant boiler system can be maintained, thereby achieving anti-corrosion protection of the pipeline.
[0030] In this embodiment, a drain port can be provided at the lower end of the dissolved oxygen tank, and a drain valve 171 can be added at the drain port (so that the dissolved oxygen tank can be cleaned regularly and drained through the drain port at the bottom).
[0031] like Figure 1 As shown, the above technical solution provides two supply pumps 2, which are connected in parallel. By providing two supply pumps, one of them can serve as a backup pump. Preferably, both the inlet and outlet ends of the supply pump 2 are equipped with a second valve 21, so that if any supply pump is damaged, it can be removed for maintenance without affecting the normal operation of the entire boiler's full protection oxygenation system.
[0032] like Figure 1As shown, in the above technical solution, the dissolved oxygen tank 1 is equipped with a first dissolved oxygen rate detection device 4, and the sensing end of the first dissolved oxygen rate detection device is located inside the dissolved oxygen tank 1, so that the oxygen content of the desalinated water in the dissolved oxygen tank can be monitored by the first dissolved oxygen rate detection device; a second dissolved oxygen rate detection device 5 is provided downstream of each oxygenation point 61, so that the oxygen content at each oxygenation point can be monitored by the second dissolved oxygen rate detection device.
[0033] like Figure 2 As shown, the dissolved oxygen tank 1 in the above technical solution is equipped with a temperature monitoring element 14 (which can be a digital display temperature measuring instrument) for monitoring the internal water temperature. A cooling jacket 15 is provided on the outer wall of the dissolved oxygen tank 1. The cooling jacket 15 has a coolant inlet and a coolant outlet. Coolant is introduced into the cooling jacket 15 to adjust the temperature of the demineralized water in the dissolved oxygen tank 1. In this way, the water temperature in the dissolved oxygen tank can be monitored in real time by the temperature monitoring element. At the same time, coolant can be circulated into the cooling jacket to adjust the water temperature in the dissolved oxygen tank (in this embodiment, the cooling jacket can cool the demineralized water in the dissolved oxygen tank when circulating coolant, especially in summer when the temperature is high. At this time, in order to improve the dissolved oxygen rate of the demineralized water, it is necessary to cool the demineralized water in the dissolved oxygen tank).
[0034] like Figure 1 As shown, the above technical solution provides three oxygen inlets 12, namely, a first oxygen inlet 12a, a second oxygen inlet 12b, and a third oxygen inlet 12c. The first oxygen inlet 12a is used to introduce hydrogen peroxide solution, the second oxygen inlet 12b is used to connect to an oxygen cylinder, and the third oxygen inlet 12c is used to connect to the oxygen discharge port of the deaerator 62 of the boiler system in a thermal power plant. Each of the three oxygen inlets 12 is equipped with a third valve 121, a second pressure reducing valve 122, and a second check valve 123 (the third valve is used to adjust the opening and closing of the corresponding oxygen supply line, the second pressure reducing valve is used to prevent excessive water pressure on the corresponding oxygen supply line, and the second check valve is used to prevent water backflow at the oxygen supply point). In this way, different types of oxygen or oxygen from different sources can be added to the dissolved oxygen tank as needed. The oxygen source in the dissolved oxygen tank is primarily the oxygen discharged from the deaerator's oxygen outlet (i.e., preferably from the third oxygen supply port). Only when the oxygen supplied by the deaerator is insufficient to meet the oxygen demand of the dissolved oxygen tank can oxygen be added to the dissolved oxygen tank through the second oxygen supply port, or hydrogen peroxide (which will decompose into oxygen in the dissolved oxygen tank) be added to the dissolved oxygen tank through the first oxygen supply port.
[0035] In this embodiment, the oxygen source for the dissolved oxygen tank has three paths: one is a deaerator, another is an oxygen cylinder, and the last is the supply of hydrogen peroxide (which stores oxygen in liquid form) into the tank. The priority of oxygen supply is, in order, the deaerator, the oxygen cylinder, and the hydrogen peroxide.
[0036] In the above technical solution, the water inlet 11 is used to connect to the demineralized water pipe (the boiler is also supplied with water from the demineralized water pipe), and the water inlet 11 is equipped with a fourth valve 111, a third pressure reducing valve 112, and a third check valve 113. This allows the demineralized water source of the dissolved oxygen tank to be consistent with that of the boiler, which can reduce the investment in equipment (the fourth valve is used to adjust the opening and closing amount to regulate the flow rate of the incoming water, the third check valve is used to prevent the demineralized water from flowing back into the dissolved oxygen tank, and the third pressure reducing valve is mainly to prevent the water pressure at the water inlet from being too high).
[0037] like Figure 2 and Figure 3 As shown, the dissolved oxygen tank 1 described in the above technical solution is equipped with a liquid level monitoring device 16, so that the liquid level in the dissolved oxygen tank can be monitored by the liquid level monitoring device, so as to regulate the dissolved oxygen rate in the dissolved oxygen tank to a dynamic balance.
[0038] like Figure 3 As shown, the above technical solution also includes a controller 7 and an alarm 8. The liquid level monitoring device 16 and the alarm 8 are both electrically connected to the controller 7. In this way, when the liquid level in the dissolved oxygen tank is low, the controller can control the alarm to issue an alarm signal to remind the staff that the inflow of desalinated water into the dissolved oxygen tank needs to be increased. The controller and the alarm can be installed at the upper end of the dissolved oxygen tank. The dissolved oxygen tank is provided with a wire hole. The liquid level monitoring device can be a liquid level sensor, and its wire passes through the wire hole and is electrically connected to the controller (the wire needs to be sealed at the position where it passes through the wire hole, which can be done by using a sealing ring and / or applying sealant). Specifically, the controller can be used to set a warning water level in the dissolved oxygen tank. If the liquid level in the dissolved oxygen tank is lower than the warning water level, the controller will activate the alarm and the operator will need to adjust the water inlet flow of the dissolved oxygen tank. At the same time, the water inlet and outlet flow of the dissolved oxygen tank also need to be balanced (at this time, flow meters can be installed at the inlet and on each oxygenation pipeline; preferably, digital flow meters can be used). In this embodiment, the controller can be an ARM series microcontroller, and the alarm can be an audible and visual alarm.
[0039] In this embodiment, the boiler system of the thermal power plant has a deaerator, demineralized water pipes, and multiple oxygen supply points, all of which are existing technologies and will not be described in detail here.
[0040] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will be more clearly described in light of the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.
Claims
1. A fully protected oxygen supply system for a thermal power plant boiler, characterized in that, The system includes a dissolved oxygen tank (1), a supply pump (2), and multiple oxygen supply pipelines (3). The dissolved oxygen tank (1) has a water inlet (11), an oxygen supply inlet (12), and a water outlet (13). The water inlet (11) is used to add demineralized water into the dissolved oxygen tank (1). The oxygen supply inlet (12) is used to introduce oxygen into the dissolved oxygen tank (1). The water outlet (13) is connected to one end of the multiple oxygen supply pipelines (3) through the supply pump (2). The multiple oxygen supply pipelines (3) correspond one-to-one with multiple oxygen supply points (61) of the boiler system of the thermal power plant. The other end of each oxygen supply pipeline (3) is used to connect and communicate with the corresponding oxygen supply point (61). The oxygen supply pipeline (3) is equipped with a first pressure reducing valve (31), a first check valve (32), and a first valve (33).
2. The fully protected oxygen supply system for thermal power plant boilers according to claim 1, characterized in that, There are two supply pumps (2), and the two supply pumps (2) are connected in parallel.
3. The fully protected oxygen supply system for thermal power plant boilers according to claim 2, characterized in that, The supply pump (2) has a second valve (21) at both its inlet and outlet ends.
4. The fully protected oxygen supply system for thermal power plant boilers according to claim 1, characterized in that, The dissolved oxygen tank (1) is equipped with a first dissolved oxygen rate detection device (4), and the sensing end of the first dissolved oxygen rate detection device is located inside the dissolved oxygen tank (1).
5. The fully protected oxygen supply system for thermal power plant boilers according to claim 4, characterized in that, A second dissolved oxygen rate detection device (5) is provided downstream of each of the oxygenation points (61).
6. The fully protected oxygen supply system for thermal power plant boilers according to claim 1, characterized in that, The dissolved oxygen tank (1) is equipped with a temperature monitoring element (14) for monitoring the internal water temperature. A cooling jacket (15) is provided on the outer wall of the dissolved oxygen tank (1). The cooling jacket (15) has a coolant inlet and a coolant outlet. Coolant is introduced into the cooling jacket (15) to regulate the temperature of the demineralized water in the dissolved oxygen tank (1).
7. The fully protected oxygen supply system for thermal power plant boilers according to claim 5, characterized in that, The oxygen supply port (12) is provided in three parts, namely the first oxygen supply port (12a), the second oxygen supply port (12b) and the third oxygen supply port (12c). The first oxygen supply port (12a) is used to introduce hydrogen peroxide solution, the second oxygen supply port (12b) is used to connect to an oxygen cylinder, and the third oxygen supply port (12c) is used to connect to the oxygen discharge port of the deaerator (62) of the boiler system of the thermal power plant. Each of the three oxygen supply ports (12) is provided with a third valve (121), a second pressure reducing valve (122) and a second check valve (123).
8. The fully protected oxygen supply system for thermal power plant boilers according to claim 7, characterized in that, The water inlet (11) is used to connect to the demineralized water pipe, and a fourth valve (111), a third pressure reducing valve (112) and a third check valve (113) are provided at the water inlet (11).
9. The fully protected oxygen supply system for thermal power plant boilers according to claim 8, characterized in that, The dissolved oxygen tank (1) is equipped with a liquid level monitoring device (16).
10. The fully protected oxygen supply system for thermal power plant boilers according to claim 9, characterized in that, It also includes a controller (7) and an alarm (8), both of which are electrically connected to the controller (7).