Shell pass water supply mechanism of vertical shell-and-tube waste boiler heat exchanger

Abstract

The utility model provides a shell pass water supply mechanism of a vertical shell-and-tube waste boiler heat exchanger, which comprises an annular tube arranged in a shell of the heat exchanger, the annular tube is arranged around a heat exchange tube bundle, the annular tube is connected with a water inlet tube, and a plurality of flow dividing holes are arranged on the annular tube. The water supply mechanism overcomes the defects of local scouring and thermal stress corrosion of the water supply pipe of the vertical waste heat boiler, and prolongs the service life of the vertical waste heat boiler.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical reaction devices, in particular to a shell-side water supply mechanism of a vertical shell and tube waste boiler heat exchanger. Background Art

[0002] The diameter of the vertical shell and tube waste boiler heat exchanger is φ2400mm, the upper section is the vertical steam drum, the middle section is the heat exchange tube, the lower section is the separator, and the net height is 24500mm. The process gas of the vertical waste boiler is 235℃, of which water vapor accounts for about 50%. The process gas enters from the process gas inlet at the top of the equipment. When passing through the heat exchange tube bundle, the water vapor in the process gas meets the cold source and liquefies into water droplets to form a gas-liquid two-phase flow. Under the action of gravity, the scouring and corrosion of the tube heat tube bundle are accelerated. Figure 1 As shown, the original vertical waste boiler water inlet adopts a direct flange form, the water supply pipeline diameter is DN150, 150class, and the waste boiler water flow rate is 102m 3 / h, direct water replenishment can easily cause the temperature of the heat exchange tube bundle near the water inlet to be too low, accelerating the scouring and corrosion inside the tube bundle. When running at full load, a large number of scouring perforations appear in the vertical waste boiler heat exchange tubes near the water inlet. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a shell-side water supply mechanism for a vertical shell and tube waste boiler heat exchanger, which solves the shortcomings of local scouring and thermal stress corrosion in the water supply pipe of the vertical waste boiler and prolongs the service life of the vertical waste boiler.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a shell-side water supply mechanism of a vertical shell and tube waste boiler heat exchanger, including an annular tube arranged in the outer shell of the heat exchanger, the annular tube is arranged around the heat exchange tube bundle, the annular tube is connected to the water inlet pipe, and a plurality of diversion holes are provided on the annular tube.

[0005] In a preferred solution, the annular tube is provided with an expansion notch, and the end of the annular tube located at the expansion notch is sealed.

[0006] In a preferred solution, a plurality of limit modules are provided in the housing, and the limit modules include a "C"-shaped holder, and the annular tube is clamped in the "C"-shaped holder.

[0007] In a preferred solution, a limiting bolt is provided at the opening position of the "C"-shaped holder.

[0008] In a preferred solution, the diversion holes are 8 to 16 groups of through holes with a diameter of 50 to 100 mm.

[0009] In a preferred embodiment, the diversion holes face multiple directions.

[0010] The utility model provides a shell-side water supply mechanism for a vertical shell and tube waste boiler heat exchanger, which solves the problem that water enters the water inlet pipe of the original vertical shell and tube waste boiler heat exchanger locally, causing the temperature of the heat exchange tube bundle near the water supply port to be too low, accelerating the scouring and corrosion in the tube bundle, and improving the uniformity of water supply. The lower section of the waste boiler heat exchange tube bundle is evenly preheated, so that the process gas is cooled and liquefied at a uniform rate in the gas phase space, avoiding corrosion and perforation of some pipelines, and does not affect the flow rate and resistance of water supply, so as to meet the needs of production load. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0012] Figure 1 It is a structural schematic diagram of a vertical shell and tube waste boiler heat exchanger;

[0013] Figure 2 It is a schematic diagram of the structure of the utility model;

[0014] Figure 3 It is a structural diagram of the limit module;

[0015] In the figure: a shell 1, an annular tube 2, a heat exchange tube bundle 3, a water inlet pipe 4, a "C"-shaped holder 5, a limiting bolt 6, a diversion hole 201, and an expansion notch 202. DETAILED DESCRIPTION

[0016] like Figure 2 As shown, a shell-side water supply mechanism of a vertical shell and tube waste boiler heat exchanger includes an annular tube 2 arranged in the shell 1 of the heat exchanger, the annular tube 2 is arranged around the heat exchange tube bundle 3, the annular tube 2 is connected to the water inlet pipe 4, the water inlet pipe 4 extends out of the shell 1 and is used for water inlet, and a plurality of diverter holes 201 are provided on the annular tube 2. When used specifically, the diverter holes 201 are 8 to 16 groups of through holes with a diameter of 50 to 100 mm, facing multiple directions, so as to improve the uniformity of water inlet and prevent the local heat exchange tubes from being scoured.

[0017] Preferably, the annular tube 2 is provided with an expansion notch 202 , and the end of the annular tube 2 located at the expansion notch 202 is sealed, and the distance of the expansion notch 202 is 5-10 mm, so as to reserve a gap for the annular tube 2 to expand due to heat.

[0018] Preferably, Figure 3 As shown, the housing 1 is provided with a plurality of limit modules. In this embodiment, the number of the limit modules is four groups, and the limit modules include a "C"-shaped holder 5, in which the annular tube 2 is mounted, and a limit bolt 6 is provided at the opening of the "C"-shaped holder 5. The "C"-shaped holder 5 supports and limits the annular tube 2 to prevent thermal expansion and contraction or water flow movement from causing displacement of the annular tube 2.

[0019] The current unchanged system inlet gas volume is 180,000 Nm3 / h, temperature: 235.5℃, 1.7MPa vertical waste boiler outlet temperature is reduced to 202℃; the temperature difference between the two planes of water supply is less than 1℃. The original liquid level gauge fluctuates greatly due to local boiling and manual operation is frequent. After the transformation, the shell-side water supply mechanism is added, the liquid level is stable, and the service life of the vertical waste boiler is extended by 1 year from the original 6-month / maintenance period, and no leakage problem has occurred so far.

Claims

1. A shell-side water supply mechanism for a vertical shell and tube waste boiler heat exchanger, characterized in that: The invention comprises an annular tube (2) arranged in a shell (1) of a heat exchanger, the annular tube (2) being arranged around a heat exchange tube bundle (3), the annular tube (2) being connected to a water inlet pipe (4), and a plurality of flow diversion holes (201) being arranged on the annular tube (2).

2. The shell side water supply mechanism of a vertical shell and tube waste boiler heat exchanger according to claim 1, characterized in that: The annular tube (2) is provided with an expansion notch (202), and the end of the annular tube (2) located at the expansion notch (202) is sealed.

3. The shell side water supply mechanism of a vertical shell and tube waste boiler heat exchanger according to claim 1, characterized in that: A plurality of limit modules are arranged in the housing (1), and the limit modules include a "C"-shaped holder (5), and the annular tube (2) is mounted in the "C"-shaped holder (5).

4. The shell side water supply mechanism of a vertical shell and tube waste boiler heat exchanger according to claim 3, characterized in that: A limiting bolt (6) is provided at the opening position of the "C"-shaped clamping seat (5).

5. The shell side water supply mechanism of a vertical shell and tube waste boiler heat exchanger according to claim 1, characterized in that: The diversion holes (201) are 8 to 16 groups of through holes with a diameter of 50 to 100 mm.

6. The shell-side water supply mechanism of a vertical shell and tube waste boiler heat exchanger according to claim 5, characterized in that: The diversion holes (201) face multiple directions.

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