Vacuum deoxidizing device for boiler

Abstract

The utility model discloses a vacuum deoxidizing device for a boiler, and relates to the technical field of vacuum deoxidizing. The boiler vacuum deoxygenization device comprises a deoxygenization tank and a circulating water tank, the top of the circulating water tank is connected with a vacuum pump, the vacuum pump is connected with a circulating water pump through a pipeline, a deoxygenization tower is arranged at the top of the deoxygenization tank, and a liquid inlet pipeline of the deoxygenization tower is connected to the pipeline between the vacuum pump and the circulating water pump; a double-layer spraying disc is arranged in the deoxidizing tower, the double-layer spraying disc of the deoxidizing tower is connected with a liquid feeding pipeline, and a conveying pipeline is arranged at the top of the deoxidizing tower, converged with the conveying pipeline at the top of the deoxidizing tank and connected to a vacuum pump; the cooling box is connected to the bottom of the circulating water tank, and an inlet of the cooling box is connected with the circulating water pump; the bottom of the deoxidizing tank is connected with a boiler through a pipeline, and a flue energy saver is arranged on the pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum deoxidation, in particular to a boiler vacuum deoxidation device. Background Art

[0002] In the energy and power industry, in order to ensure the safe operation of the boiler, it is very important to effectively deoxygenate the boiler feed water.

[0003] Oxygen corrosion is one of the key issues affecting the safe operation and service life of boilers. With the development of hot water boilers, corrosion has become a more prominent issue, attracting significant attention. Oxygen dissolved in water is a significant factor in boiler corrosion. Experiments have confirmed that the corrosion rate is proportional to the oxygen concentration in the solution, accelerating with increasing oxygen concentration. Oxygen corrosion is characterized by ulcer-like formations and is most likely to occur in the boiler's upper drum, downcomer, and economizer. Oxygen is a very reactive gas that can directly combine with most metals. When combined, it often forms precipitates or stable oxides. The primary corrosive agent is dissolved oxygen in the water. The most effective way to prevent boiler oxygen corrosion is to enhance the deoxygenation of boiler feedwater to ensure that the oxygen content meets water quality standards.

[0004] The existing vacuum deoxidation device has a low deoxidation efficiency, which causes oxygen corrosion inside the boiler, resulting in reduced safety performance and service life of the boiler. Utility Model Content

[0005] To this end, an embodiment of the present invention provides a boiler vacuum deoxidation device to solve the problems existing in the above-mentioned technology.

[0006] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0007] A boiler vacuum deaerator, characterized in that it comprises a deaerator tank and a circulating water tank, wherein a vacuum pump is connected to the top of the circulating water tank, and the vacuum pump is connected to the circulating water pump through a pipeline, a deaerator tower is arranged on the top of the deaerator tank, and a liquid pipeline of the deaerator tower is connected to the pipeline between the vacuum pump and the circulating water pump;

[0008] A double-layer spray disc is provided in the deaerator, and the double-layer spray disc of the deaerator is connected to the liquid pipeline. A delivery pipeline is provided on the top of the deaerator, which merges with the delivery pipeline on the top of the deaerator tank and is connected to the vacuum pump.

[0009] It also includes a cooling box, which is connected to the bottom of the circulating water tank, and the inlet of the cooling box is connected to the circulating water pump;

[0010] The bottom of the deaerator is connected to the boiler through a pipeline, and a flue energy saver is provided on the pipeline.

[0011] Optionally, a liquid level gauge is provided in the deaerator tank, a first overflow port is provided on the deaerator tank at a certain height from the bottom of the tank body, and a manhole is provided on the top of the deaerator tank.

[0012] Optionally, a gas outlet is provided at the top of the circulating water tank, and a second overflow port is provided at a certain height from the bottom of the circulating water tank.

[0013] Optionally, the deoxygenation tank and the circulation tank body are integrated into a horizontal tank.

[0014] Optionally, the double-layer spray disc is connected to a liquid pipeline via two pipelines.

[0015] Optionally, the circulating water pump is connected to a frequency conversion device.

[0016] The utility model has at least the following beneficial effects:

[0017] The utility model uses the negative pressure generated by the vacuum pump to draw the water in the circulating water tank into the deaerator, and uses the vacuum environment to lower the boiling point of the water, thereby more effectively removing the dissolved oxygen in the water. The double-layer spray disk in the deaerator increases the contact area between water and air by spraying, thereby improving the deoxygenation efficiency, thereby reducing the dissolved oxygen in the boiler water, thereby avoiding oxygen corrosion in the boiler as much as possible, and improving the safety performance of the boiler operation and the service life of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the embodiments of the present invention. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other drawings based on the provided drawings without inventive effort.

[0019] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented. Any structural modifications, changes in proportions, or adjustments in sizes shall remain within the scope of the technical contents disclosed herein without affecting the efficacy and objectives of the present invention.

[0020] Figure 1 This is a schematic diagram of the principle structure of an embodiment of the present utility model.

[0021] Description of reference numerals:

[0022] 1. Deaerator tank; 2. Circulating water tank; 3. Vacuum pump; 4. Circulating water pump; 5. Deaerator tower; 6. Double-layer spray plate; 7. Cooling box; 8. Flue economizer; 9. Liquid level gauge; 10. First overflow port; 11. Manhole; 12. Gas outlet; 13. Second overflow port. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0024] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not necessarily need to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0025] In addition, the terms "including", "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization solutions conceived by the present invention.

[0026] like Figure 1 As shown, a boiler vacuum deaerator disclosed in the present invention includes a deaerator tank 1 and a circulating water tank 2, so the top of the circulating water tank 2 is connected to a vacuum pump 3, and the vacuum pump 3 is connected to the circulating water pump 4 through a pipeline. A deaerator tower 5 is arranged on the top of the deaerator tank 1, and the liquid pipeline of the deaerator tower 5 is connected to the pipeline between the vacuum pump 3 and the circulating water pump 4;

[0027] A double-layer spray disc 6 is provided in the deaeration tower 5, and the double-layer spray disc 6 of the deaeration tower 5 is connected to the liquid pipeline. A delivery pipeline is provided on the top of the deaeration tower 5, which merges with the delivery pipeline on the top of the deaeration tank 1 and is connected to the vacuum pump 3;

[0028] It also includes a cooling box 7, which is connected to the bottom of the circulating water tank 2, and the inlet of the cooling box 7 is connected to the circulating water pump 4;

[0029] The bottom of the deaerator tank 1 is connected to the boiler via a pipeline, and a flue economizer 8 is provided on the pipeline.

[0030] The vacuum deoxygenation device of this embodiment is based on Henry's law, which states that in a closed container, the amount of gas dissolved in water is proportional to the partial pressure of the gas on the water surface. When water boils, the partial pressure of the vapor on the water surface increases, while the partial pressure of the gas dissolved in the water decreases. When the water surface is filled with water vapor, the water no longer has the ability to dissolve the gas, and the dissolved gas precipitates out. The saturation temperature characteristic of water indicates that even low-temperature water can boil in a vacuum. Vacuum deoxygenation utilizes this characteristic to achieve its purpose.

[0031] The deaerator tank 1 and circulating water tank 2 are combined into a single horizontal tank. A water pump and a vacuum jet pump generate a vacuum of 91.8-93.1 kPa, bringing softened water with an incoming liquid temperature of t≥43°C to a boil (the client's incoming raw liquid is heated to ≥43°C via a plate heat exchanger at 23°C). Oxygen and related gases in the water are drawn into the water tank for gas-liquid separation and then discharged through the tank exhaust port. The treated feedwater has an oxygen content of ≤0.05-0.1 mg and is then supplied to the boiler for use. This non-heating method conserves high-quality steam resources.

[0032] Deoxygenation is divided into two links: atomization and vacuum. The incoming softened water is divided into two pipelines and enters the double-layer spray disk 6 of the deaerator 5. The double-layer spray disk 6 is a two-layer annular nozzle that is atomized into fine droplets to accelerate the removal of oxygen in the incoming water. The circulating water pump 4 is frequency-controlled. According to the temperature of the incoming liquid, the spray vacuum is adjusted to keep the deaerator 1 within a reasonable vacuum range to maximize energy saving. The condensate collected by the steam is returned to the deaerator 5 for deoxygenation according to the liquid level control, and no sewage is discharged. When the water temperature in the circulating water tank is too high, it is cooled by the circulating water cooling box 7. The circulating water cooling box 7 adopts a stainless steel shell and tube heat exchanger and uses the 10-20℃ recycled water in the plant area as the cooling medium;

[0033] A liquid level gauge 9 is provided in the deaerator tank 1 , a first overflow port 10 is provided on the deaerator tank 1 at a certain height from the bottom of the tank body, and a manhole 11 is provided on the top of the deaerator tank 1 .

[0034] The main function of the liquid level gauge 9 in the deaerator tank 1 is to monitor and control the water level in the tank. The liquid level gauge 9 can display the water level in the tank in real time, which is very important for ensuring the deaeration effect and the safe operation of the equipment.

[0035] Manhole 11, located on deaerator tank 1, provides convenient access for personnel to enter and exit the tank for installation, inspection, maintenance, and cleaning. Manhole 11, typically located at the top of the deaerator tank 1, can be easily opened and closed to ensure safety and a tight seal within the tank. During equipment inspection or cleaning, personnel can enter the tank through manhole 11 to perform necessary operations, ensuring stable operation and maintenance of the equipment.

[0036] The top of the circulating water tank 2 is provided with a gas outlet 12, and a second overflow port 13 is provided at a certain height from the bottom of the tank. The gas outlet 12 is provided to release gas. In the circulating water tank, gas will be dissolved or generated during the water circulation process. The gas outlet can release this gas to prevent the pressure in the tank from being too high.

[0037] The setting of the first overflow port 10 and the second overflow port 13 can control the water level in the deaerator tank 1 and the circulating water tank 2. When the water level in the deaerator tank 1 and the circulating water tank 2 exceeds the set value, the excess water is discharged through the first overflow port 10 and the second overflow port 13 to maintain the normal water level in the tank body.

[0038] The specific heights of the first overflow port 10 and the second overflow port 13 are set according to the specific requirements of the deaerator tank 1 .

[0039] In addition, to ensure the normal use of the boiler, the water pump and vacuum device are both used in conjunction with one for backup.

[0040] When the water pump or vacuum pump 3 fails and the equipment is shut down urgently, the nitrogen sealing valve is activated and nitrogen is injected into the deoxygenated water tank to seal it and prevent outside air from entering.

[0041] At the same time, a PLC inverter control cabinet can be configured to control various electrical components.

[0042] The entire horizontal tank can be installed on a skid with an integral base at the location of the previously abandoned thermal deaerator tank 1 in the house.

[0043] The utility model of the boiler vacuum deaerator has strong adaptability, low failure rate, low energy consumption and high safety performance: the instruments and electrical appliances are standard high-temperature resistant products, the system is simple and the reliability is strong.

[0044] The device has a high degree of automation and adopts PLC program control, which is easy to operate and reduces labor intensity. The device is a complete set of skid-mounted equipment, which is reasonable and compact, occupies a small area, and is easy to construct and install;

[0045] The device does not regenerate any waste by-products.

[0046] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0047] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0048] The above description of the present invention is relatively specific and detailed through a general explanation and specific embodiments. It should be noted that variations and modifications to these specific embodiments are possible without departing from the spirit of the present invention, and all such variations and modifications fall within the scope of protection of this application. Therefore, the scope of protection of this patent application shall be determined by the appended claims.

Claims

1. A boiler vacuum deaerator, characterized by: It includes a deaerator tank and a circulating water tank, so the top of the circulating water tank is connected to a vacuum pump, and the vacuum pump is connected to the circulating water pump through a pipeline. The deaerator tower is set on the top of the deaerator tank, and the liquid pipeline of the deaerator tower is connected to the pipeline between the vacuum pump and the circulating water pump; A double-layer spray disc is provided in the deaerator, and the double-layer spray disc of the deaerator is connected to the liquid pipeline. A delivery pipeline is provided on the top of the deaerator, which merges with the delivery pipeline on the top of the deaerator tank and is connected to the vacuum pump. It also includes a cooling box, which is connected to the bottom of the circulating water tank, and the inlet of the cooling box is connected to the circulating water pump; The bottom of the deaerator is connected to the boiler through a pipeline, and a flue energy saver is provided on the pipeline.

2. A boiler vacuum deaerator according to claim 1, characterized in that: A liquid level gauge is provided in the deaerator tank, a first overflow port is provided on the deaerator tank at a certain height from the bottom of the tank body, and a manhole is provided on the top of the deaerator tank.

3. A boiler vacuum deaerator according to claim 1, characterized in that: A gas outlet is provided on the top of the circulating water tank, and a second overflow port is provided at a certain height from the bottom of the circulating water tank.

4. A boiler vacuum deaerator according to claim 1, characterized in that: The deaeration tank and the circulation tank body are integrated into a horizontal tank.

5. The boiler vacuum deaerator according to claim 1, characterized in that: The double-layer spray disc is connected to the liquid pipeline through two pipelines.

6. A boiler vacuum deaerator according to claim 1, characterized in that: The circulating water pump is connected to a frequency conversion device.

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