Gas evaporator with corrosion-resistant and high-temperature-resistant tube plate

Abstract

The gas evaporator comprises a heat exchanger, a gas inlet is formed in one side of the heat exchanger, a gas outlet is formed in the other end of the heat exchanger, the tube plate is arranged in the heat exchanger, a pouring layer is arranged on the surface of the tube plate, the tube plate is of a hollow cylinder structure, and a plurality of heat exchange tubes are arranged in the center of the tube plate. The tube plate is connected with the steam pocket through the ascending tube, the steam pocket is connected with the header through the descending tube, the header is connected with the interior of the tube plate through a pipeline, and a steam outlet is formed in the top of the steam pocket. The heat exchanger has the advantages that corrosion-resistant, high-temperature-resistant and fire-resistant pouring materials are additionally arranged on the surface of the pipe plate at the hot air inlet end of the heat exchanger, the pipe plate is effectively protected, the conditions of weld joint cracking of the heat exchanger pipe plate and a hot air pipe and high-temperature corrosion and erosion damage of the pipe plate and the hot air pipe are remarkably relieved after transformation, and the service life of the pipe plate of the gas evaporator is effectively prolonged; the method has good economic benefits and has a wide market in the yellow phosphorus industry.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas evaporators, and in particular relates to a gas evaporator with a corrosion-resistant and high-temperature-resistant tube plate. Background Art

[0002] The gas evaporator is a critical energy (steam) supplier and furnace exhaust (gas) consumer for the entire plant. Therefore, it is considered a crucial piece of equipment for our company's production and environmental management. The gas evaporator is a heat exchange steam generator, primarily using high-temperature hot air to heat the soft water within the evaporator's main heat exchanger to high-temperature steam before outputting it. Under normal operating conditions, the temperature of the hot air reaching the inlet of the heat exchanger's hot air pipes and the drum tube sheet can reach approximately 900-1050°C. Prolonged operation under these high-temperature, high-operating conditions can lead to cracks in the welds between the tube sheet and the heat exchanger due to the different metal materials and thermal expansion coefficients. Due to the high velocity of the hot air, acidic corrosion from the hot air, and the effects of elemental phosphorus, the heat exchanger can cause cracks in various directions in the welds between the tube sheet and the heat exchanger tube ends, weld debonding, and wear and thinning of the tube sheet and tube wall. In severe cases, this can cause water leakage in the heat exchanger. Summary of the Invention

[0003] In response to the problems in the above-mentioned prior art, the utility model provides a gas evaporator with a corrosion-resistant and high-temperature resistant tube sheet, and its technical solution is: it includes a heat exchanger, an air inlet is provided on one side of the heat exchanger, and an air outlet is provided at the other end, a tube sheet is provided inside the heat exchanger, and a casting layer is provided on the surface of the tube sheet. The tube sheet is a hollow cylindrical structure with a plurality of heat exchange tubes arranged in the center. The tube sheet is connected to the steam drum through an ascending pipe, the steam drum is connected to the header through a downcomer, the header is connected to the inside of the tube sheet through a pipeline, and a steam outlet is provided at the top of the steam drum.

[0004] As a preferred solution, the surface of the tube sheet is fixedly provided with embedded steel bars, and the tube sheet is fixedly connected to the casting layer through the embedded steel bars.

[0005] As a preferred solution, the thickness of the casting layer is at least 50 mm, and its material is a mixture of aluminum silicate and refractory cement.

[0006] As a preferred solution, a liquid level gauge is provided on the steam drum.

[0007] As a preferred solution, a water inlet hole is provided on the side of the steam drum.

[0008] As a preferred solution, hand holes are provided at both ends of the header.

[0009] As a preferred solution, a sewage pipe is provided at the bottom of the collecting box.

[0010] As a preferred solution, an escalator is provided on the top of the steam drum.

[0011] Beneficial effects of the utility model:

[0012] By installing corrosion-resistant, high-temperature-resistant and refractory casting materials on the surface of the tube sheet at the hot air inlet end of the heat exchanger, the tube sheet is effectively protected. After the transformation, the cracking of the welds between the heat exchanger tube sheet and the hot air pipe, and the high-temperature corrosion and erosion damage of the tube sheet and the hot air pipe are significantly alleviated, effectively extending the service life of the gas evaporator tube sheet, with good economic benefits and a broad market in the yellow phosphorus industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the main view of the present utility model.

[0014] Figure 2 It is a left view of the present utility model.

[0015] Figure 3 It is a right side view of the middle tube plate of the present utility model.

[0016] In the figure: 1. Heat exchanger; 101. Air inlet; 102. Tube sheet; 1021. Casting layer; 1022. Embedded reinforcement; 1023. Heat exchange tube; 103. Air outlet; 2. Riser; 3. Steam drum; 301. Steam outlet; 302. Liquid level gauge; 303. Water inlet; 4. Downcomer; 5. Header; 501. Hand hole; 502. Sewage pipe; 6. Escalator. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below based on the accompanying drawings and specific embodiments.

[0018] Example

[0019] like Figure 1-3 A gas evaporator with a corrosion-resistant and high-temperature resistant tube sheet shown in FIG. 1 includes a heat exchanger 1, characterized in that an air inlet 101 is provided on one side of the heat exchanger 1 and an air outlet 103 is provided at the other end. A tube sheet 102 is provided inside the heat exchanger 1, and a casting layer 1021 is provided on the surface of the tube sheet 102. The tube sheet 102 is a hollow cylindrical structure with a plurality of heat exchange tubes 1023 provided in the center. The tube sheet 102 is connected to the steam drum 3 through the riser 2, and the steam drum 3 is connected to the header 5 through the downcomer 4. The header 5 is connected to the inside of the tube sheet 102 through a pipeline, and a steam outlet 301 is provided at the top of the steam drum 3.

[0020] Furthermore, the surface of the tube sheet 102 is fixedly provided with embedded steel bars 1022, and the tube sheet 102 is fixedly connected to the casting layer 1021 through the embedded steel bars 1022. The embedded steel bars 1022 increase the adhesion between the tube sheet 102 and the casting layer 1021 to prevent the casting layer 1021 from falling off.

[0021] Furthermore, the thickness of the casting layer is at least 50 mm, and its material is a mixture of aluminum silicate and refractory cement.

[0022] Furthermore, a liquid level gauge 302 is provided on the steam drum 3 for monitoring the water level value in the steam drum 3 .

[0023] Furthermore, a water inlet 303 is provided on the side of the steam drum 3 . When water needs to be added to the steam drum 3 , water is added to the steam drum 3 through the water inlet 303 .

[0024] Furthermore, hand holes 501 are provided at both ends of the header 5, and maintenance can be performed through the hand holes 501 during maintenance.

[0025] Furthermore, a sewage pipe 502 is provided at the bottom of the collection box 5 , and when the collection box 5 needs to be cleaned, water is discharged through the sewage pipe 502 .

[0026] Furthermore, an escalator 6 is provided on the top of the steam drum 3, and the escalator 6 is used to climb onto the steam drum 3 during maintenance.

[0027] The above-mentioned device operates as follows: When high-temperature, corrosive, and impure yellow phosphorus exhaust enters the heat exchanger 1 through the air inlet 101, the cast layer 1021 on the surface of the tube sheet 102 insulates the welds between the heat exchange tubes 1023 and the tube sheet 102, protecting these welds from the following: corrosion of the tube sheet 102 by the yellow phosphorus exhaust; weld debonding due to the difference in thermal expansion coefficients between the heat exchange tubes and the tube sheet 102; cracks at the heat exchange tube ends and wear and thinning of the tube sheet wall. In severe cases, these conditions may even cause water leakage in the heat exchanger 1. The yellow phosphorus exhaust exchanges heat with the pure water inside the tube sheet 102, turning into steam that enters the steam drum 3 through the riser 2. Some of the steam condenses into water and enters the header 5 through the downcomer 4. The header 5 is connected to the interior of the tube sheet 102 via a pipeline, forming a circulation system. The steam then provides high-temperature steam to other work areas through the steam outlet 301.

Claims

1. A gas evaporator with a corrosion-resistant and high-temperature-resistant tube sheet, comprising a heat exchanger (1), characterized in that: The heat exchanger (1) is provided with an air inlet (101) on one side and an air outlet (103) on the other end. A tube sheet (102) is provided inside the heat exchanger (1). A casting layer (1021) is provided on the surface of the tube sheet (102). The tube sheet (102) is a hollow cylindrical structure with a plurality of heat exchange tubes (1023) provided at the center. The tube sheet (102) is connected to the steam drum (3) through the riser (2). The steam drum (3) is connected to the header (5) through the downcomer (4). The header (5) is connected to the inside of the tube sheet (102) through a pipeline. A steam outlet (301) is provided at the top of the steam drum (3).

2. The gas evaporator with corrosion-resistant and high-temperature resistant tube sheet according to claim 1, characterized in that: The surface of the tube sheet (102) is fixedly provided with embedded steel bars (1022), and the tube sheet (102) is fixedly connected to the casting layer (1021) via the embedded steel bars (1022).

3. The gas evaporator with corrosion-resistant and high-temperature resistant tube sheet according to claim 1, characterized in that: The casting layer (1021) has a thickness of at least 50 mm and is made of a mixture of aluminum silicate and refractory cement.

4. The gas evaporator with corrosion-resistant and high-temperature-resistant tube sheet according to claim 1, characterized in that: A liquid level gauge (302) is provided on the steam drum (3).

5. The gas evaporator with corrosion-resistant and high-temperature-resistant tube sheet according to claim 1, characterized in that: A water inlet hole (303) is provided on the side of the steam drum (3).

6. The gas evaporator with corrosion-resistant and high-temperature-resistant tube sheet according to claim 1, characterized in that: Hand holes (501) are provided at both ends of the header (5).

7. The gas evaporator with corrosion-resistant and high-temperature-resistant tube sheet according to claim 1, characterized in that: A sewage pipe (502) is provided at the bottom of the header (5).

8. The gas evaporator with corrosion-resistant and high-temperature-resistant tube sheet according to claim 1, characterized in that: An escalator (6) is provided on the top of the steam drum (3).

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