A method for arranging a superheater tube of a waste heat boiler

Abstract

This invention discloses a method for arranging superheater pipes in a waste heat boiler, comprising the following steps: the steam outlet of the boiler drum is connected to the steam inlet of the superheater via a steam inlet pipe; the steam outlet of the superheater is connected to the steam inlet header of the steam distribution cylinder via a steam outlet pipe. The superheater includes several existing superheater tubes arranged horizontally and vertically in parallel. When waste heat flue gas is input into the superheater, the waste heat flue gas undergoes heat exchange through the parallel-arranged existing superheater tubes to reduce the resistance of the steam medium transported within the superheater tubes and increase the temperature of the steam medium transported within the superheater tubes. The heat-exchanged steam medium then enters the steam distribution cylinder under low resistance. Using this method, the parallel arrangement of several existing superheater tubes reduces the steam velocity and resistance within the pipes, which helps to improve the waste heat steam output and the utilization rate of waste heat gas at the kiln head, and reduces the boiler outlet air temperature, ensuring the safe operation of the rotary kiln and the kiln head electrostatic precipitator.

Description

Technical Field

[0001] This invention relates to the field of boiler equipment modification technology, specifically to a method for arranging superheater pipes in a waste heat boiler. Background Technology

[0002] In the production process of waste heat boilers, reducing the resistance of the boiler superheater is crucial for stabilizing steam generation and lowering the boiler outlet air temperature. However, reducing resistance is not easy. A mature process involves staggered superheater tube arrangements, where waste heat air creates a resistance drop through the superheater tubes, reducing air velocity and maximizing the superheater's heat exchange effect. However, production practice has shown that staggered superheater tube arrangements increase steam velocity and resistance within the pipes after heat exchange. This prevents the generated steam from reaching the steam header on the steam distribution cylinder, leading to increased boiler drum pressure and frequent tripping of the boiler drum safety valve. Therefore, it is necessary to reduce tube resistance.

[0003] In the existing technology, factors such as the staggered arrangement of several superheated tubes in the superheater, the diameter of the inlet and outlet pipes on both sides of the superheater, and the influence of waste heat air and pipeline resistance cause the boiler drum safety valve to trip frequently, resulting in the inability to guarantee the boiler outlet temperature and steam output.

[0004] This method results in significant fluctuations in waste heat air and pipeline resistance, making it impossible to guarantee boiler outlet temperature and steam output. Because of the staggered arrangement of superheated tubes, the boiler waste heat air volume must be controlled and the outlet air temperature balanced by reducing rotary kiln output, severely impacting kiln production and the safe and stable operation of the kiln head electrostatic precipitator. Summary of the Invention

[0005] The purpose of this invention is to provide a method for arranging superheater pipes in a waste heat boiler, which solves the problem of high resistance when transporting steam medium through several superheater pipes in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A method for arranging superheater piping in a waste heat boiler includes the following steps:

[0008] S1. The steam outlet of the boiler drum is connected to the steam inlet of the superheater through the steam inlet pipe;

[0009] S2. The steam outlet end of the superheater is connected to the steam inlet header end of the steam distribution cylinder through a steam outlet pipe;

[0010] The superheater includes a superheater inlet manifold, several existing superheater pipes, and a superheater outlet manifold. The superheater inlet manifold and the superheater outlet manifold are connected by several existing superheater pipes, which are arranged in parallel horizontally and vertically. When waste heat flue gas is input into the superheater, the waste heat flue gas exchanges heat through the several existing superheater pipes arranged in parallel to reduce the resistance of the steam medium transported in the superheater pipes and increase the temperature of the steam medium transported in the superheater pipes. The steam medium transported in the superheater pipes after heat exchange enters the steam distribution cylinder under low resistance.

[0011] As a further aspect of the present invention: when several existing superheater tubes are arranged, a protective pipe is provided between the superheater inlet manifold and the superheater outlet manifold. The protective pipe is arranged along the direction of waste heat flue gas transportation and is flush with and parallel to the existing superheater tubes. The protective pipe reduces the wear of the existing superheater tubes by waste heat flue gas.

[0012] As a further aspect of the present invention: a new superheated pipe is arranged in parallel between the protective pipe and the existing superheated pipe. The two ends of the new superheated pipe are respectively connected to the superheater inlet steam header and the superheater outlet steam header. The new superheated pipe exchanges heat with the waste heat flue gas in advance to reduce the flow rate and resistance of the steam medium transported in the existing superheated pipe.

[0013] As a further aspect of the present invention, the steam inlet pipe in step S1 and the steam outlet pipe in step S2 are detachable and replaceable to balance the pressure of the steam medium transported in the superheater.

[0014] The beneficial effects of this invention are:

[0015] (1) When using this method to heat exchange the steam output from the boiler drum, without changing the original boiler, the arrangement of several existing superheated tubes is modified. Several existing superheated tubes are arranged in parallel horizontally and vertically, replacing the traditional method of staggered arrangement of several existing superheated tubes. The steam generated by the boiler drum is transported to the superheater inlet header through the steam inlet pipe, and then transported to the superheater outlet header by several existing superheated tubes arranged in parallel horizontally and vertically. The waste heat flue gas forms a certain resistance drop through the parallel existing superheated tubes, which can reduce the wind speed. After the heat exchange of the parallel existing superheated tubes, the steam flow velocity in the pipe is reduced and the resistance is reduced. The transported steam can be smoothly transported to the steam header docking end of the steam distribution cylinder under the resistance drop, thereby avoiding the boiler drum pressure increase, preventing the boiler drum safety valve from frequently tripping, which helps to improve the waste heat steam production and the utilization rate of waste heat gas at the kiln head, and reduce the boiler outlet air temperature to stabilize the rotary kiln and the safe operation of the kiln head electric bag collector.

[0016] (2) When several existing superheating tubes are arranged, protective tubes are set up flush with and parallel to the existing superheating tubes. The protective tubes reduce the wear of the waste heat flue gas on the existing superheating tubes. The waste heat flue gas enters the superheater and comes into contact with the protective tubes before being flushed. The protective tubes block the scouring force on the several existing superheating tubes arranged in parallel in the back row, thereby reducing the wear of the waste heat flue gas directly flushing the existing superheating tubes and helping to improve the service life of the existing superheating tubes.

[0017] (3) A new superheated pipe is installed in parallel between the protective pipe and the existing superheated pipe. The new superheated pipe exchanges heat with the waste heat flue gas in advance to reduce the flow rate and resistance of the steam medium in the existing superheated pipe. The new superheated pipe can further reduce the resistance of the steam medium in the existing superheated pipe, thereby improving the utilization rate of waste heat gas at the kiln head and stabilizing the waste heat steam production.

[0018] (4) Using this method, without changing the original boiler, several existing superheated tubes are transformed into horizontal and vertical parallel arrangements. Then, by using the newly added superheated tubes, the resistance of the steam medium pipeline is greatly reduced. By changing the diameter of the inlet and outlet steam pipelines on both sides of the superheater, the overall pressure drop from the boiler steam drum to the steam use point is reduced, thereby improving the utilization rate of waste heat gas at the kiln head and stabilizing the output of waste heat steam. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a process flow diagram of the boiler drum, superheater and steam distribution cylinder of the present invention;

[0021] Figure 2 This is a schematic diagram of the existing superheater pipes arranged horizontally side by side between the superheater inlet manifold and the superheater outlet manifold of the present invention.

[0022] Figure 3 This is a schematic diagram of the existing superheater pipes arranged vertically side by side between the superheater inlet manifold and the superheater outlet manifold of the present invention.

[0023] In the diagram: 1. Boiler drum; 2. Steam inlet pipe; 3. Superheater; 30. Superheater inlet manifold; 31. Superheater outlet manifold; 32. Existing superheater pipe; 33. Protective pipe; 4. Outlet pipe; 5. Steam distribution cylinder; 6. Steam header. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention; in the description of this invention, "a plurality of" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] Please see Figure 1-3 As shown, the present invention is a method for arranging superheater pipes in a waste heat boiler, comprising the following steps:

[0027] S1. The steam outlet of the boiler drum 1 is connected to the steam inlet of the superheater 3 through the steam inlet pipe 2. The steam generated by the boiler drum 1 is easily transported to the superheater 3 through the steam inlet pipe 2. The superheater 3 performs heat exchange treatment to make the output temperature increased and the steam dry.

[0028] S2. The steam outlet of the superheater 3 is connected to the steam inlet header of the steam distributor 5 through the steam outlet pipe 4. When the superheater 3 processes the steam to obtain a temperature-increased and dry steam, the processed steam is transported to the steam distributor 5 through the steam outlet pipe 4. The steam distributor 5 is used to distribute the steam generated during boiler operation to each steam header 6.

[0029] The superheater 3 includes a superheater inlet manifold 30, several existing superheater pipes 32, and a superheater outlet manifold 31. The superheater inlet manifold 30 and the superheater outlet manifold 31 are connected by several existing superheater pipes 32, which are arranged in parallel horizontally and vertically. When waste heat flue gas is introduced into the superheater 3, the waste heat flue gas exchanges heat through the several existing superheater pipes 32 arranged in parallel to reduce the resistance of the steam medium transported in the superheater pipes and increase the temperature of the steam medium transported in the superheater pipes. The steam medium transported in the superheater pipes after heat exchange enters the steam distribution cylinder 5 under low resistance.

[0030] When using this method to heat exchange the steam output from boiler drum 1, without altering the original boiler, the arrangement of several existing superheater tubes 32 is modified. These existing superheater tubes 32 are arranged horizontally and vertically side-by-side, replacing the traditional staggered arrangement. The steam generated by boiler drum 1 is transported to the superheater inlet header 30 via the inlet pipe 2, and then transported to the superheater outlet header 31 by the horizontally and vertically arranged existing superheater tubes 32. Waste heat flue gas passes through the parallel arrangement of the existing superheater tubes... The superheated pipe 32 creates a certain resistance drop, which can reduce the wind speed. After heat exchange, the steam flow rate in the pipes of the parallel superheated pipes 32 decreases, and the resistance decreases. Under the condition of resistance drop, the transported steam can be smoothly transported to the connection end of the steam header 6 of the steam distribution cylinder 5, thereby avoiding the increase of boiler drum 1 pressure. This prevents the boiler drum 1 safety valve from frequently tripping, helps to improve the waste heat steam production and the utilization rate of waste heat gas at the kiln head, and reduces the boiler outlet air temperature to stabilize the rotary kiln and the safe operation of the kiln head electric bag collector.

[0031] In this specific implementation, such as Figure 2 As shown, when several existing superheater tubes 32 are arranged, a protective pipe 33 is installed between the superheater inlet header 30 and the superheater outlet header 31. The protective pipe 33 is installed along the direction of waste heat flue gas transportation and is flush with and parallel to the existing superheater tubes 32. The protective pipe 33 reduces the wear of the existing superheater tubes 32 by the waste heat flue gas. The waste heat flue gas enters the superheater 3 and comes into contact with the protective pipe 33 before being flushed. The protective pipe 33 blocks the flushing force on the several existing superheater tubes 32 arranged in parallel in the back row, thereby reducing the wear of the existing superheater tubes 32 by the waste heat flue gas directly flushing them, which helps to improve the service life of the existing superheater tubes 32.

[0032] Furthermore, a new superheated pipe is installed in parallel between the protective pipe 33 and the existing superheated pipe 32. The two ends of the new superheated pipe are connected to the superheater inlet steam header 30 and the superheater outlet steam header 31, respectively. By exchanging heat with the waste heat flue gas in advance through the new superheated pipe, the flow rate and resistance of the steam medium transported in the existing superheated pipe 32 are reduced. The new superheated pipe can further reduce the resistance of the steam medium transported in the existing superheated pipe 32, thereby improving the utilization rate of waste heat gas at the kiln head and stabilizing the output of waste heat steam.

[0033] In this specific embodiment, the steam inlet pipe 2 in step S1 and the steam outlet pipe 4 in step S2 can be disassembled and replaced to balance the pressure of the steam medium transported in the superheater 3. During the process of the boiler drum 1, superheater 3 and steam distribution cylinder 5 transporting the steam medium in sequence, the steam inlet pipe 2 and the steam outlet pipe 4 can be disassembled and replaced as needed, which is convenient to operate. When the pipe diameter of the steam inlet pipe 2 and the steam outlet pipe 4 is increased, the resistance of the steam medium transported on both sides of the superheater 3 is reduced, thereby reducing the impact of pipe resistance on steam transport and ensuring the output of the waste heat boiler.

[0034] The key takeaway from this method is that, without altering the original boiler, several existing superheater tubes 32 are modified to be arranged horizontally and vertically in parallel. The addition of new superheater tubes 34 significantly reduces the resistance of the steam transport pipeline. Furthermore, by changing the diameter of the inlet and outlet steam pipes 4 on both sides of the superheater 3, the overall pressure drop from the boiler drum 1 to the steam consumption point is reduced. This improves the utilization rate of waste heat gas at the kiln head and stabilizes the waste heat steam production. Under certain pressure, the output valve of the steam distribution cylinder 5 opens, which can easily generate steam hammer, affecting the service life of the pipeline. Therefore, the boiler water supply pump should undergo regular spare parts maintenance to prevent water outages and ensure the stability of the production line.

[0035] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for arranging superheater pipes in a waste heat boiler, characterized in that, Includes the following steps: S1. The steam outlet of the boiler drum (1) is connected to the steam inlet of the superheater (3) through the steam inlet pipe (2); S2, the steam outlet end of the superheater (3) is connected to the steam inlet header end of the steam distribution cylinder (5) through the steam outlet pipe (4); The superheater (3) includes a superheater inlet manifold (30), several existing superheater pipes (32) and a superheater outlet manifold (31). The superheater inlet manifold (30) and the superheater outlet manifold (31) are connected by several existing superheater pipes (32), and the several existing superheater pipes (32) are arranged in parallel horizontally and vertically. When waste heat flue gas is input into the superheater (3), the waste heat flue gas exchanges heat through the several existing superheater pipes (32) arranged in parallel, so as to reduce the resistance of the steam medium transported in the superheater pipe and increase the temperature of the steam medium transported in the superheater pipe. The steam medium transported in the superheater pipe after heat exchange enters the steam distribution cylinder (5) under low resistance. When several existing superheat pipes (32) are arranged, a protective pipe (33) is provided between the superheater inlet steam header (30) and the superheater outlet steam header (31). The protective pipe (33) is arranged along the direction of waste heat flue gas transportation and is flush with and parallel to the existing superheat pipes (32). The protective pipe (33) reduces the wear of the existing superheat pipes (32) by the waste heat flue gas. A new superheated pipe is arranged in parallel between the protective pipe (33) and the existing superheated pipe (32). The two ends of the new superheated pipe are connected to the superheater inlet steam header (30) and the superheater outlet steam header (31), respectively. The new superheated pipe exchanges heat with the waste heat flue gas in advance to reduce the flow rate and resistance of the steam medium transported in the existing superheated pipe (32) after it is discharged. The steam inlet pipe (2) in step S1 and the steam outlet pipe (4) in step S2 can be disassembled and replaced to balance the pressure of the steam medium transported in the superheater (3).

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