A furnace purging system for start-up heaters

Abstract

The application provides a start-up heating furnace hearth purging system, relates to the technical field of hearth purging, and comprises a low-pressure steam branch pipe used for being connected with a low-pressure steam main pipe, a first valve and an electric control valve being sequentially arranged on the low-pressure steam branch pipe along a steam flow direction, the low-pressure steam branch pipe being connected with a steam purging main pipe through the electric control valve, the steam purging main pipe being connected with a steam purging branch pipe, the steam purging branch pipe being used for being connected with a start-up heating furnace hearth purging hole, a drain pipe being connected on the low-pressure steam branch pipe between the first valve and the electric control valve, the drain pipe being used for being connected with an original drain system pipe network, a valve assembly being arranged on the drain pipe, the low-pressure steam branch pipe being connected with the existing low-pressure steam main pipe, in use, the electric control valve is electrically connected with a controller, the electric control valve is opened and closed through the controller, manual control on site is not needed, an operator is prevented from being scalded by high temperature of a furnace body when performing valve opening and closing operation, and a safety hidden danger is eliminated.

Description

Technical Field

[0001] This application relates to the field of furnace purging technology, and more specifically, to a furnace purging system for a start-up heating furnace. Background Technology

[0002] Start-up heating furnaces are industrial heating equipment that play a crucial role in industrial production processes. They generate heat by burning fuel to provide the necessary thermal energy for ammonia synthesis reactions and are widely used in petrochemical, refining, and coal chemical industries.

[0003] Before igniting the start-up heating furnace, the furnace chamber must be purged. The main purpose is to remove residual combustible gases and debris from the furnace chamber to prevent safety accidents such as explosions during ignition. At the same time, the furnace chamber is dried and the equipment sealing is checked.

[0004] However, during the purging of the existing start-up heating furnace, operators need to manually open the valves on-site. Due to the unreasonable design of the relative position of the steam valves and the furnace body in the traditional purging system, some valves are installed too close to the outer wall of the furnace. When operators open or close the valves, they are easily burned by the high temperature of the furnace body, which poses a safety hazard. Summary of the Invention

[0005] The purpose of this application is to provide a start-up heating furnace burner that can solve the technical problems mentioned in the background art.

[0006] This application provides a start-up heating furnace purging system, including a low-pressure steam branch pipe for connection to a low-pressure steam main pipe. A first valve and an electrically controlled valve are sequentially arranged on the low-pressure steam branch pipe along the steam flow direction. The low-pressure steam branch pipe is connected to a steam purging main pipe via the electrically controlled valve. The steam purging main pipe is connected to the steam purging branch pipe, which is used to connect to the start-up heating furnace purging port. A drain pipe is connected between the first valve and the electrically controlled valve on the low-pressure steam branch pipe. The drain pipe is used to connect to an existing drain system network, and a valve assembly is provided on the drain pipe.

[0007] Furthermore, the steam purging main pipe includes a main pipe and a secondary pipe, which are connected by a reducing pipe section, and the secondary pipe is connected to the steam purging branch pipe through a second valve.

[0008] Furthermore, an exhaust assembly is provided on the secondary pipe between the reducing pipe section and the second valve. The exhaust assembly includes an exhaust main pipe, an exhaust branch pipe, a first free semi-floating ball type steam trap, and a first exhaust valve. One end of the exhaust main pipe is connected to the secondary pipe. The first free semi-floating ball type steam trap is located on the exhaust main pipe. One end of the exhaust branch pipe is connected to the exhaust main pipe, and the connection point is located between the first free semi-floating ball type steam trap and the secondary pipe. The first exhaust valve is located on the exhaust branch pipe.

[0009] Furthermore, the valve assembly includes a third valve and a fourth valve arranged in parallel on the drain pipe, and a second free semi-floating ball drain valve and a fifth valve arranged in series with the fourth valve, wherein the second free semi-floating ball drain valve is located between the fourth valve and the fifth valve.

[0010] Furthermore, a sixth valve is provided on the steam purging branch pipe, and an exhaust pipe is connected between the sixth valve and the furnace purging hole of the start-up heating furnace on the steam purging branch pipe, and a second exhaust valve is provided on the exhaust pipe.

[0011] Furthermore, there are two steam purging branch pipes.

[0012] The beneficial effects of this utility model are:

[0013] This utility model connects a low-pressure steam branch pipe to the existing low-pressure steam main pipe. In use, the electric control valve is electrically connected to the controller, and the controller controls the opening and closing of the electric control valve. No manual control by the operator is required on site, avoiding burns from the high temperature of the furnace body when the operator operates the valve, eliminating safety hazards. In addition, the drainage pipe is connected to the original drainage network, making full use of the existing drainage facilities, with good compatibility with the existing system, and reducing additional construction costs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a process system diagram of some embodiments of this application;

[0016] The reference numerals in the attached figures are as follows:

[0017] 1. Low-pressure steam branch pipe; 2. First valve; 3. Electric control valve; 4. Steam purging main pipe; 41. Main pipe; 42. Secondary pipe; 5. Steam purging branch pipe; 6. Drainage pipe; 7. Valve assembly; 71. Third valve; 72. Fourth valve; 8. Reducing pipe section; 9. Exhaust assembly; 91. Exhaust main pipe; 92. Exhaust branch pipe; 93. First free semi-floating ball type drain valve; 94. First exhaust valve; 10. Second valve; 11. Second free semi-floating ball type drain valve; 12. Fifth valve; 13. Sixth valve; 14. Exhaust pipe; 15. Second exhaust valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific implementation examples:

[0025] like Figure 1 As shown, this application provides a start-up heating furnace purging system, including a low-pressure steam branch pipe 1 for connection to a low-pressure steam main pipe. A first valve 2 and an electrically controlled valve 3 are sequentially arranged on the low-pressure steam branch pipe 1 along the steam flow direction. The low-pressure steam branch pipe 1 is connected to a steam purging main pipe 4 via the electrically controlled valve 3. The steam purging main pipe 4 is connected to a steam purging branch pipe 5, which is used to connect to the start-up heating furnace purging port. A drain pipe 6 is connected between the first valve 2 and the electrically controlled valve 3 on the low-pressure steam branch pipe 1. The drain pipe 6 is used to connect to the existing drain system network. A valve assembly 7 is provided on the drain pipe 6. In use, the electrically controlled valve 3 is electrically connected to a controller, and the controller controls the opening and closing of the electrically controlled valve 3. When the start-up heating furnace purging system starts working, low-pressure steam flows from the low-pressure steam main pipe into the furnace. The low-pressure steam branch pipe 1 and the first valve 2 serve to initially control the steam entering the system. They can be opened or closed as needed. Operators can control the electric control valve 3 to allow steam of appropriate flow rate and pressure to enter the steam purging main pipe 4, based on the specific specifications of the start-up heating furnace, the furnace size, and purging requirements. The steam then enters the steam purging branch pipe 5 through the steam purging main pipe 4, and then enters the furnace through the furnace purging port connected to the steam purging branch pipe 5 to purify the furnace interior. The electric control valve 3 is opened and closed by the controller, eliminating the need for manual operation and preventing operators from being burned by the high temperature of the furnace body during valve operation, thus eliminating safety hazards. Furthermore, the drain pipe 6 is connected to the existing drain network, making full use of existing drain facilities, ensuring good compatibility with the existing system, and reducing additional construction costs.

[0026] like Figure 1As shown, the steam purging main pipe 4 includes a main pipe 41 and a secondary pipe 42. The main pipe 41 and the secondary pipe 42 are connected by a reducing pipe section 8. The secondary pipe 42 is connected to the steam purging branch pipe 5 through a second valve 10. Specifically, the diameter of the main pipe 41 is larger than that of the secondary pipe 42. The main pipe 41 and the secondary pipe 42 are connected by a reducing pipe section 8. The change in pipe diameter changes the steam flow rate. The higher steam flow rate in the secondary pipe 42 can generate a stronger impact force, which can more effectively remove debris and residual combustible gases in the furnace, improve the thoroughness of purging, and ensure safety before the start-up heating furnace is ignited.

[0027] like Figure 1 As shown, an exhaust assembly 9 is provided on the secondary pipe 42 between the reducing pipe section 8 and the second valve 10. The exhaust assembly 9 includes an exhaust main pipe 91, an exhaust branch pipe 92, a first free semi-floating ball steam trap 93, and a first exhaust valve 94. One end of the exhaust main pipe 91 is connected to the secondary pipe 42. The first free semi-floating ball steam trap 93 is located on the exhaust main pipe 91. One end of the exhaust branch pipe 92 is connected to the exhaust main pipe 91, and the connection point is located between the first free semi-floating ball steam trap 93 and the secondary pipe 42. The first exhaust valve 94 is located on the exhaust branch pipe 92. During the operation of the steam purging system, condensate will be generated due to heat dissipation and other reasons as the steam flows in the pipe. This condensate will accumulate in the secondary pipe 42. When the condensate reaches the connection between the exhaust main pipe 91 and the secondary pipe 42... When the connection is made, the first free semi-floating ball steam trap 93 will automatically open according to the water level change, allowing the condensate to be discharged through the exhaust manifold 91. This prevents excessive accumulation of condensate in the secondary pipe 42, which would affect the normal flow of steam and the purging effect. When abnormal conditions occur in the system, such as excessively high steam pressure, air accumulation in the pipeline, or when the pipeline needs to be purged before system startup, the first exhaust valve 94 can be opened. At this time, the gas in the secondary pipe 42 (including air, possible non-condensable gases, and steam generated when the pressure changes) will be discharged from the system through the exhaust branch pipe 92 and the exhaust manifold 91, thereby ensuring stable pressure in the system and avoiding problems such as pressure fluctuations and water hammer caused by gas accumulation, ensuring the safety and stability of the steam purging process.

[0028] like Figure 1As shown, valve assembly 7 includes a third valve 71 and a fourth valve 72 connected in parallel on the drain pipe 6, and a second free semi-floating ball type drain valve 11 and a fifth valve 12 connected in series with the fourth valve 72. The second free semi-floating ball type drain valve 11 is located between the fourth valve 72 and the fifth valve 12. During system operation, steam in the low-pressure steam branch pipe 1 produces condensate due to temperature changes. The condensate accumulates at the inlet of the drain pipe 6. When the water level reaches a certain height, the second free semi-floating ball type drain valve 11 will automatically open, using the principle of buoyancy to discharge the condensate through the drain pipe 6 into the original drain system network. Because the second free semi-floating ball type drain valve 11 and the fourth valve 72 are connected in series, the second free semi-floating ball type drain valve 11 and the fourth valve 72 are connected in series. 72. The fifth valve 12 is connected in series, so the fourth valve 72 and the fifth valve 12 need to be in the open state to ensure that the condensate can pass through smoothly. The third valve 71 and the fourth valve 72 are connected in parallel. When it is necessary to repair the second free semi-floating ball steam trap 11, the fourth valve 72 or the fifth valve 12, the fourth valve 72 and the fifth valve 12 can be closed, and the third valve 71 can be opened at the same time to allow the condensate to be discharged through the branch where the third valve 71 is located, without affecting the normal drainage function of the system. In addition, by adjusting the opening degree of the third valve 71 and the fourth valve 72, the drainage flow rate can be controlled according to the actual amount of condensate, ensuring that the condensate in the system can be discharged in a timely and appropriate manner.

[0029] like Figure 1 As shown, a sixth valve 13 is installed on the steam purging branch pipe 5. An exhaust pipe 14 is connected to the start-up furnace purging port on the steam purging branch pipe 5 between the sixth valve 13 and the exhaust pipe 14. A second exhaust valve 15 is installed on the exhaust pipe 14. During steam purging of the start-up furnace, the sixth valve 13 is open, and steam flows from the steam purging main pipe 4 through the steam purging branch pipe 5 to the start-up furnace purging port to purge the furnace. At this time, the second exhaust valve 15 is normally closed to ensure that the steam can flow in a concentrated manner. To ensure the purging effect in the furnace, when it is necessary to vent the steam purging branch pipe 5, such as to remove air from the pipe before system startup, or if abnormal gas accumulation or pressure is found in the pipe during purging, the second vent valve 15 can be opened. At this time, the gas in the steam purging branch pipe 5 (including air, possible non-condensable gases, and steam generated due to pressure changes) will be discharged through the vent pipe 14, thereby regulating the pressure in the pipe and preventing problems such as excessive pressure or uneven purging caused by gas accumulation.

[0030] like Figure 1 As shown, there are two steam purging branch pipes 5. When the two steam purging branch pipes 5 work at the same time, the steam flow rate can be increased, making the purging coverage wider and stronger, and more effectively removing impurities, dust and residual gases in the furnace, thereby improving the purging efficiency, ensuring that the furnace reaches a high degree of cleanliness, and providing a guarantee for the normal start-up and safe operation of the heating furnace.

[0031] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A start-up heater furnace chamber purge system characterized by: The system includes a low-pressure steam branch pipe for connection to a low-pressure steam main pipe. A first valve and an electrically controlled valve are sequentially arranged on the low-pressure steam branch pipe along the steam flow direction. The low-pressure steam branch pipe is connected to a steam purging main pipe via the electrically controlled valve. The steam purging main pipe is connected to the steam purging branch pipe. The steam purging branch pipe is used to connect to the furnace purging port of the start-up heating furnace. A drain pipe is connected between the first valve and the electrically controlled valve on the low-pressure steam branch pipe. The drain pipe is used to connect to the existing drain system network. A valve assembly is provided on the drain pipe.

2. A furnace purging system for a start-up heating furnace according to claim 1, characterized in that: The steam purging main pipe includes a main pipe and a secondary pipe, which are connected by a reducing pipe section. The secondary pipe is connected to the steam purging branch pipe through a second valve.

3. The furnace purging system for a start-up heating furnace according to claim 2, characterized in that: An exhaust assembly is provided on the secondary pipe between the reducing pipe section and the second valve. The exhaust assembly includes an exhaust main pipe, an exhaust branch pipe, a first free semi-floating ball steam trap, and a first exhaust valve. One end of the exhaust main pipe is connected to the secondary pipe. The first free semi-floating ball steam trap is located on the exhaust main pipe. One end of the exhaust branch pipe is connected to the exhaust main pipe, and the connection point is located between the first free semi-floating ball steam trap and the secondary pipe. The first exhaust valve is located on the exhaust branch pipe.

4. The furnace purging system for a start-up heating furnace according to claim 1, characterized in that: The valve assembly includes a third valve and a fourth valve arranged in parallel on the drain pipe, and a second free semi-floating ball drain valve and a fifth valve arranged in series with the fourth valve, wherein the second free semi-floating ball drain valve is located between the fourth valve and the fifth valve.

5. The furnace purging system for a start-up heating furnace according to claim 1, characterized in that: The steam purging branch pipe is equipped with a sixth valve, and an exhaust pipe is connected between the sixth valve and the furnace purging hole of the start-up heating furnace on the steam purging branch pipe. The exhaust pipe is equipped with a second exhaust valve.

6. The furnace purging system for a start-up heating furnace according to claim 5, characterized in that: There are two steam purging branch pipes.

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