Efficient condenser bubbling deoxygenization device and method

Abstract

The invention discloses an efficient condenser bubbling deoxygenization device and method, which comprises the steps that a demineralized water spraying device is arranged on a condenser tube bundle, a water baffle is arranged at the lower part of a flow nozzle and the upper part of the tube bundle, so that water mixed and heated by steam directly flows into a bubbling water tank, and meanwhile, five concave water collecting tanks are additionally arranged below the bubbling water tank; desalted water drops which fall down are collected and finally flow into a bubbling V-shaped water tank, the V-shaped water tank, angle steel and parts below the V-shaped water tank and the angle steel are lifted by 600mm on the original basis, the position of the angle steel is changed to be above the normal water level of the condenser, an original vertical baffle on one side of the angle steel is changed into an inclined water spraying plate, and holes are drilled in the water spraying plate, so that water falls on the angle steel in a columnar shape. By additionally arranging the demineralized water spraying device, the water baffle, the concave water collecting tank and the water spraying plate, efficient bubbling deoxygenation of the condenser can be achieved, the dissolved oxygen index of condensed water is reduced, corrosion of oxygen in the condensed water to a pipeline is prevented, and great economic benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of bubbling deaeration of steam turbine condensers, and specifically provides a device and method for efficient bubbling deaeration of condensers. Background Technique

[0002] Bubbling deaeration in a steam turbine condenser is equivalent to a secondary heating effect. The air leaking into the condenser and the make-up water of demineralized water will both cause the condensate water to contain oxygen. Since the temperature of the condensate water is lower than the saturation temperature corresponding to the vacuum pressure, oxygen will dissolve in it. Bubbling deaeration is to introduce heating steam to heat the condensate water in the hot well to the saturation temperature corresponding to the vacuum pressure, so as to precipitate oxygen.

[0003] As Figure 1-2 shown, there is an existing 135MW ultra-high pressure steam turbine generator set. Due to a large amount of external heat supply, the make-up water of demineralized water is relatively large. For a long time, the problem of excessive dissolved oxygen in the condensate water of this steam turbine condenser has always existed. The daily dissolved oxygen is 70-120 μg / L, and the highest can reach 300 μg / L. According to the ultra-high pressure unit standard, the dissolved oxygen in the condensate water should not exceed 50 μg / L. The excessive oxygen content in the condensate water will accelerate the corrosion of the equipment pipeline system and reduce the safety and reliability of equipment operation. Through the research and analysis of the operation of this condenser, the poor existing bubbling deaeration effect is the main reason for the unqualified dissolved oxygen. The bubbling deaeration has the following problems:

[0004] 1. There is no spraying device on the upper part of the V-shaped water tank for bubbling deaeration. During operation, the demineralized water replenished into the condenser basically does not go through sufficient steam-water mixing and heat transfer first.

[0005] 2. The 15 angle steels that play a role in sputtering and spraying are submerged below the normal water level of the condenser, and it is difficult to achieve an efficient deaeration effect. Summary of the Invention

[0006] The purpose of the present invention is to provide a device and method for efficient bubbling deaeration of condensers to reduce the corrosion of pipelines by oxygen in the condensate water, so as to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] An efficient condenser bubbling deaeration device, comprising a water inlet pipe located on one side at the upper end of the condenser, an extraction steam pipe penetrating through the top of the condenser, a support pipe located inside the condenser, a steam inlet pipe located below the support pipe, an angle steel located inside the condenser, and a make-up water outlet pipe located at the bottom of the condenser. The condenser is provided with flow nozzles with fixed nozzles above the support pipe, and the flow nozzles spray upward. A baffle plate is provided on one side of the flow nozzles, and the baffle plate is obliquely arranged between the nozzle and the support pipe; The condenser is provided with five concave collecting troughs below the bubbling water tank, and the concave collecting troughs are used to collect the falling demineralized water droplets and finally flow into the V-shaped trough of the bubbling; An inclined water spraying plate is provided above the angle steel, the water spraying plate is connected to the bubbling water tank, and there is a Ф5mm small hole drilled per square centimeter on the water spraying plate.

[0009] Further, the inlet water pressure drop of the flow nozzle is 1.0 kg / cm 2 When it is, the water spraying volume is 3 t / h, and a total of five rows of flow nozzles are installed from left to right, and there are 12 flow nozzles in each row.

[0010] Further, the V-shaped trough is made of 2 mm thick stainless steel, with a width of 0.2 m, a depth of 0.1 m, and a length 7.6 m shorter than the length of the bubbling water tank.

[0011] Further, the water spraying plate has the same width as the bubbling water tank, which is 1064 mm, a length of 300 mm, a thickness of 16 mm, and is arranged at an angle of 30°.

[0012] The present invention provides another technical solution: A method for efficient condenser bubbling deaeration, comprising the following steps:

[0013] S1: Install a demineralized water spraying device, that is, a flow nozzle with a fixed nozzle, above the condenser tube bundle, spray upward, and install a baffle plate below the flow nozzle and above the tube bundle, so that the water heated by steam mixing directly flows into the bubbling water tank. At the same time, add five concave collecting troughs below the bubbling water tank to collect the falling demineralized water droplets and finally flow into the V-shaped trough of the bubbling;

[0014] S2: Cut off the upper part of the V-shaped trough of the original bubbling deaeration device, and raise the V-shaped trough, the angle steel and the following parts by 600 mm on the original basis, so that the position of the angle steel is above the normal water level of the condenser;

[0015] S3: Calculate according to the demineralized water make-up scalar of 160 t / h for bubbling deaeration and a flow rate not exceeding 0.5 m / s. Make the V-shaped trough of the bubbling with 2 mm thick stainless steel, with a width of 0.2 m, a depth of 0.1 m, and a length 7.6 m shorter than the length of the bubbling water tank;

[0016] S4: Change the original vertical baffle on the angle steel into an inclined water spraying plate, and drill a Ф5mm small hole every square centimeter on the water spraying plate, so that the water falls on the angle steel in a columnar shape, and move the position of the angle steel 50mm to the left wall in the condenser.

[0017] Further, in S1, the flow nozzles are 7.8m according to the length of the hot well, each flow nozzle is spaced 0.6m apart, and the distance between the flow nozzle and the bottom of the rear cylinder is greater than the maximum range of the nozzle.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The device and method for bubble deaeration of the high-efficiency condenser of the present invention can realize bubble deaeration of the high-efficiency condenser, reduce the dissolved oxygen index of the condensate water, prevent the corrosion of the pipeline by the oxygen in the condensate water, and have great economic benefits by adding a demineralized water spraying device, a water baffle, a concave water collecting tank, and a water spraying plate to the existing condenser structure. Description of the Drawings

[0020] Figure 1 It is the front view of the bubble deaeration system before the existing transformation;

[0021] Figure 2 is Figure 1 the side view of;

[0022] Figure 3 It is the structure diagram of the device after the transformation of the present invention;

[0023] Figure 4 It is the side view of the bubble deaeration device of the present invention before and after the transformation;

[0024] Figure 5 It is the top view structure schematic diagram of the V-shaped water tank of the present invention;

[0025] Figure 6 It is the schematic diagram of the angle steel position layout of the present invention.

[0026] In the figure: 1, water inlet pipe; 2, steam extraction pipe; 3, support pipe; 4, steam inlet pipe; 5, angle steel; 6, make-up water outlet pipe; 7, flow nozzle; 8, water baffle; 9, concave water collecting tank; 10, V-shaped water tank; 11, water spraying plate; 12, small hole. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0028] As Figure 1-2 shown, the existing condenser bubbling deaeration device includes a water inlet pipe 1 on one side of the upper end of the condenser, an extraction steam pipe 2 passing through the top of the condenser, a support pipe 3 inside the condenser, a steam inlet pipe 4 below the support pipe 3, an angle steel 5 inside the condenser, and a make-up water outlet pipe 6 at the bottom of the condenser. In order to achieve efficient condenser bubbling deaeration, reduce the dissolved oxygen index of the condensate, and prevent the oxygen in the condensate from corroding the pipeline, please refer to Figures 3-6 . The efficient condenser bubbling deaeration device provided by the embodiment of the present invention is provided with a flow nozzle 7 with a fixed nozzle above the support pipe 3 in the condenser. The flow nozzle 7 sprays upward. A water baffle 8 is provided on one side of the flow nozzle 7. The water baffle 8 is obliquely arranged between the nozzle 7 and the support pipe 3; Five concave collecting troughs 9 are arranged below the bubbling water tank in the condenser. The concave collecting troughs 9 are used to collect the falling demineralized water droplets and finally flow into the V-shaped water trough 10 for bubbling; An inclined water spraying plate 11 is provided above the angle steel 5. The water spraying plate 11 is connected to the bubbling water tank, and a small hole 12 with a diameter of Ф5mm is drilled per square centimeter on the water spraying plate 11.

[0029] In order to further better explain the implementation process of the above device, this embodiment also provides a method for efficient condenser bubbling deaeration, including the following steps:

[0030] S1: Install a demineralized water spraying device, that is, a flow nozzle 7 with a fixed nozzle, above the condenser tube bundle, spraying upward. When the water inlet pressure drop of each flow nozzle 7 is 1.0 kg / cm 2 , the water spraying volume is 3 t / h. A total of 5 rows of flow nozzles 7 are installed from left to right. Each row of flow nozzles 7 has 12 nozzles. The length of the hot well is 7.8 m, and the interval between the flow nozzles 7 is 0.6 m. Through calculation, the distance between the flow nozzle 7 and the bottom of the rear cylinder is much greater than the maximum range of the nozzle, so there is enough heat exchange space for mass transfer and heat exchange between steam and water, ensuring the effect of spray deaeration.

[0031] Secondly, since water will form a water film when it hits the circulating water tube bundle, resulting in poor heat exchange effect of the condenser and too large terminal difference, it is necessary to avoid the sprayed water flowing onto the tube bundle as much as possible. In the present invention, a water baffle 8 is installed below the flow nozzle 7 and above the tube bundle, so that the water heated by steam mixing directly flows into the bubbling water tank. At the same time, five concave collecting troughs 9 are added below the bubbling water tank to collect the falling demineralized water droplets and finally flow into the V-shaped water trough 10 for bubbling, as Figure 3 shown;

[0032] S2: Cut off the upper part of the V-shaped water trough 10 of the original bubbling deaeration device, and raise the V-shaped water trough 10, the angle steel 5 and the following parts by 600 mm on the original basis, so that the position of the angle steel 5 is above the normal water level of the condenser, thereby achieving the effect of splash deaeration, as Figure 4as shown;

[0033] S3: According to the make-up demineralized water scalar of 160 t / h for bubbling deaeration and a flow rate not exceeding 0.5 m / s for measurement, and considering that the water tank should avoid receiving condensate that does not require deaeration, the V-shaped water tank 10 for bubbling is made of stainless steel with a thickness of 2 mm, a width of 0.2 m, a depth of 0.1 m, and a length 7.6 m shorter than the length of the bubbling water tank, as Figure 5 shown;

[0034] S4: Change the originally vertical side baffle of the angle steel 5 into an inclined water spraying plate 11, and drill a Ф5 mm small hole 12 per square centimeter on the water spraying plate 11, so that the water falls onto the angle steel 5 in a columnar shape, greatly increasing the sputtering effect. Among them, the water spraying plate 11 has the same width as the bubbling water tank, which is 1064 mm, a length of 300 mm, a thickness of 16 mm, and is arranged at an angle of 30°. The position of the angle steel 5 is moved 50 mm further to the left wall on the original basis, as Figure 6 shown.

[0035] Applying the device and method of the present invention to the existing 135 MW ultra-high pressure steam turbine generator set, the dissolved oxygen index of the steam turbine condensate significantly decreases, and the average dissolved oxygen value is in the range of 40 - 50 μg / L, reducing the corrosion of the pipeline by the oxygen in the condensate. The economic benefits are calculated as follows:

[0036] Due to the reduction of the corrosion effect of the oxygen in the condensate on the pipeline, the equipment failure rate is reduced, and the power generation time of the unit is increased.

[0037] 1) The average annual savings in maintenance costs is about 60,000 yuan

[0038] 2) The annual increase in the power generation operation time of the unit is about 1.5 days, and the increased power generation is about 4.5 million kWh. After deducting the power generation cost and calculated at the benefit of 0.2 yuan per kWh of electricity generated, the annual economic benefit is 900,000 yuan.

[0039] In summary, the annual economic benefit: 6 + 90 = 960,000 yuan.

[0040] It can be seen that an efficient bubbling deaeration device and method for a condenser provided by the present invention can achieve efficient bubbling deaeration of the condenser, reduce the dissolved oxygen index of the condensate, prevent the corrosion of the pipeline by the oxygen in the condensate, and have great economic benefits.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. An apparatus for bubbling deaeration in an efficient condenser, comprising a water inlet pipe (1) located on one side of the upper end of the condenser, an extraction steam pipe (2) penetrating through the top of the condenser, a support pipe (3) located inside the condenser, a steam inlet pipe (4) located below the support pipe (3), an angle steel (5) located inside the condenser, and a make-up water outlet pipe (6) located at the bottom of the condenser, characterized in that: Above the support pipe (3) of the condenser, a flow nozzle (7) for fixing the nozzle is arranged, and the flow nozzle (7) sprays upward. A water baffle (8) is arranged on one side of the flow nozzle (7), and the water baffle (8) is obliquely arranged between the nozzle (7) and the support pipe (3); Five concave collecting troughs (9) are arranged below the bubbling water tank of the condenser, and the concave collecting troughs (9) are used to collect the falling demineralized water droplets and finally flow into the V-shaped water trough (10) of the bubble; Above the angle steel (5), an inclined water spraying plate (11) is arranged. The water spraying plate (11) is connected to the bubbling water tank, and a small hole (12) with a diameter of Ф5mm is drilled per square centimeter on the water spraying plate (11).

2. The device for bubble deaeration of an efficient condenser according to claim 1, characterized in that: The inlet pressure drop of the flow nozzle (7) is 1.0 kg / cm 2 When it is, the water injection volume is 3 t / h. There are five rows of flow nozzles (7) installed from left to right, and each row of flow nozzles (7) has 12 pieces.

3. The device for bubble deaeration of an efficient condenser according to claim 1, wherein: The V-shaped water trough (10) is made of stainless steel with a thickness of 2mm, a width of 0.2m, a depth of 0.1m, and a length 7.6m shorter than the length of the bubbling water tank.

4. The device for bubble deaeration of an efficient condenser according to claim 1, characterized in that: The water spraying plate (11) has the same width of 1064mm, length of 300mm, and thickness of 16mm as the bubbling water tank, and is arranged at an angle of 30°.

5. A method for bubble deaeration of an efficient condenser, characterized in that: It includes the following steps: S1: Arrange a demineralized water spraying device, that is, a flow nozzle (7) with a fixed nozzle, above the condenser tube bundle, spray upward, and install a water baffle (8) below the flow nozzle (7) and above the tube bundle, so that the water heated by steam mixing directly flows into the bubbling water tank. At the same time, add five concave collecting troughs (9) below the bubbling water tank to collect the falling demineralized water droplets and finally flow into the V-shaped water trough (10) of the bubble; S2: Cut off the upper part of the V-shaped water trough (10) of the original bubbling deaeration device, and raise the V-shaped water trough (10), angle steel (5) and the following part by 600mm on the original basis, so that the position of the angle steel (5) is above the normal water level of the condenser; S3: Calculate according to the demineralized water supplement scalar of 160t / h for bubbling deaeration and a flow rate not exceeding 0.5m / s. The V-shaped water trough (10) of the bubble is made of stainless steel with a thickness of 2mm, a width of 0.2m, a depth of 0.1m, and a length 7.6m shorter than the length of the bubbling water tank; S4: Change the originally vertical side baffle of the angle steel (5) into an inclined water spraying plate (11), and drill a small hole (12) with a diameter of Ф5mm per square centimeter on the water spraying plate (11) so that the water falls on the angle steel (5) in a column shape, and move the position of the angle steel (5) 50mm to the left wall in the condenser.

6. The method for bubble deaeration of an efficient condenser according to claim 5, characterized in that: In S1, the length of the flow nozzle (7) is 7.8m according to the length of the hot well. The distance between each flow nozzle (7) is 0.6m, and the distance between the flow nozzle (7) and the bottom of the rear cylinder is greater than the maximum range of the nozzle.

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