Scaling monitoring system for furnace tube of once-through furnace

Abstract

The utility model discloses a once-through boiler tube scaling monitoring system in the technical field of once-through boiler detection, a boiler tube comprises a box body, a water supply pipeline connected with the box body, a sleeve set and a steam pipe, and the system comprises an inlet temperature sensor and an outlet temperature sensor which are respectively arranged at an inlet and an outlet of the sleeve set, the flowmeter and the inlet pressure sensor are arranged on the water supply pipeline, the outlet pressure sensor and the steam dryness detector are arranged on the steam pipe, and the dosing pump is communicated with the water supply pipeline. According to the system, the temperature difference between an inlet and an outlet of an evaporation section is detected through a temperature sensor, the flow and the water pressure of a water inlet pipe are detected through a flow meter and an inlet pressure sensor, and the air pressure and the dryness of a steam pipe are detected through an outlet pressure sensor and a steam dryness detector; the scale can be monitored in time, and scaling can be inhibited.

Description

Technical Field

[0001] This utility model relates to the field of DC boiler testing, specifically to a DC boiler tube scaling monitoring system. Background Technology

[0002] Scale buildup on boiler tubes is a prominent issue affecting thermal efficiency and safe operation during the operation of once-through boilers. Traditional once-through boiler monitoring devices rely mainly on a single parameter for alarms, which has the following shortcomings: 1) Limited detection methods: The monitoring devices only judge scale buildup based on temperature or pressure parameters, making them prone to missed alarms due to fluctuations in operating conditions. 2) Delayed fault response: Due to the limited detection methods and lack of scale removal capabilities, by the time abnormal scale buildup is detected, the risk of tube rupture is often imminent, requiring shutdown for maintenance to remove the scale. Shutdown not only interrupts steam supply and causes power generation losses, but the repair process may also trigger secondary damage such as thermal stress cracks, increasing maintenance costs. Utility Model Content

[0003] The purpose of this invention is to provide a scale monitoring system for DC boiler tubes, which solves the problem that existing DC boiler detection devices cannot detect scale on boiler tubes in a timely manner.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] A scaling monitoring system for a direct-flow furnace tube includes a housing, a water supply pipeline connected to the housing, a casing assembly, and a steam pipe. The system includes inlet and outlet temperature sensors located at the inlet and outlet of the casing assembly, a flow meter and an inlet pressure sensor on the water supply pipeline, an outlet pressure sensor and a steam dryness meter on the steam pipe, and a dosing pump connected to the water supply pipeline. The dosing pump is used to pump scale inhibitor into the water supply pipeline when scaling occurs on the furnace tube. The system detects the inlet and outlet temperature difference of the evaporation section using two temperature sensors, detects the flow rate and water pressure of the inlet water pipe using the flow meter and inlet pressure sensor, and detects the steam pressure and steam dryness of the steam pipe using the outlet pressure sensor and steam dryness meter. When these parameters are abnormal, the controller adds scale inhibitor to the water supply pipeline via the dosing pump to inhibit scaling on the furnace tube.

[0006] As a further optimization of this utility model, the outlet of the dosing pump is connected to a dosing pipe, the dosing pump is connected to the water supply pipeline through the dosing pipe, and a check valve is provided on the dosing pipe.

[0007] As a further optimization of this utility model, a flow sensor is provided on the dosing pipe.

[0008] As a further optimization of this utility model, the box body includes a preheating box and an evaporation box, and the preheating box is provided with a first guide pipe, and the evaporation box is provided with a second guide pipe. The preheating box is connected to the inlet of the sleeve assembly through the first guide pipe, and the second guide pipe is connected to the outlet of the sleeve assembly through the second guide pipe. The inlet temperature sensor and the outlet temperature sensor are respectively installed on the first guide pipe and the second guide pipe.

[0009] As a further optimization of this utility model, the water supply pipeline includes a water supply pump and an inlet pipe located at the outlet of the water supply pump, as well as a water supply pipe located at the inlet of the water supply pump. The water supply pump is connected to the preheating box through the inlet pipe, and the flow meter and the inlet pressure sensor are both installed on the inlet pipe.

[0010] As a further optimization of this utility model, a feed pipe for supplying fuel is provided on one side of the DC furnace, and the system also includes a valve installed on the feed pipe.

[0011] As a further optimization of this utility model, the steam pipe is provided with an exhaust pipe, and the system also includes a second valve provided on the exhaust pipe, the second valve being provided with a top cap with a side opening.

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

[0013] This invention uses inlet and outlet temperature sensors to detect the temperature difference between the inlet and outlet of the evaporation section, a flow meter and an inlet pressure sensor to detect the flow rate and water pressure of the inlet pipe, and an outlet pressure sensor and a steam dryness detector to detect the steam pressure and steam dryness of the steam pipe. It can perform multi-parameter detection on multiple parts of the furnace tube, avoiding the situation where the scale detection is not timely due to a single detection method, and can detect the scale formation of the furnace tube in advance.

[0014] This invention uses an information acquisition module composed of multiple sensors to detect the scaling condition of furnace tubes. It can detect scale when the scale is slight, and when scale appears in the furnace tubes, it adds scale inhibitor to the water supply line through a dosing pump to prevent the scaling phenomenon from worsening due to delayed response to scaling faults. This avoids shutdown for maintenance due to severe scaling of the furnace tubes, reduces steam supply interruptions caused by shutdown for scale removal, and lowers energy loss. Attached Figure Description

[0015] Figure 1 This is a system block diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the feed pipe structure of this utility model;

[0018] In the diagram: 1. Box body; 2. Water supply pipeline; 3. Sleeve assembly; 4. Steam pipe; 5. Inlet temperature sensor; 6. Outlet temperature sensor; 7. Flow meter; 8. Inlet pressure sensor; 9. Outlet pressure sensor; 10. Steam dryness detector; 11. Dosing pump; 12. Dosing pipe; 13. Check valve; 14. Flow sensor; 15. Guide pipe one; 16. Guide pipe two; 17. Feed pipe; 18. Valve one; 19. Valve two; 20. Top cap; 21. Alarm; 101. Preheating box; 102. Evaporation box; 201. Water supply pump; 202. Inlet pipe; 203. Water supply pipe; 301. Jacketed pipe; 302. Connecting pipe. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example

[0021] like Figure 1 and Figure 2 As shown, this embodiment relates to a scaling monitoring system for a DC-DC furnace tube, which is installed on the furnace tube of the DC-DC furnace. The furnace tube of the DC-DC furnace includes a housing 1, a water supply pipeline 2 connected to the housing 1, a sleeve assembly 3, and a steam pipe 4. The housing 1 includes a preheating box 101 and an evaporation box 102 located on top of the preheating box 101. In this embodiment, the furnace tube has multiple housings 1, and a partition is provided between the preheating box 101 and the evaporation box 102 of the housing 1. Each preheating box 101 is interconnected, and each evaporation box 102 is interconnected. In addition, in some other embodiments, only a single housing 1 may be provided. The sleeve assembly 3 includes multiple jacketed pipes 301 and connecting pipes 302. Adjacent jacketed pipes 301 are connected by connecting pipes 302. Each jacketed pipe 301 consists of an inner pipe and an outer pipe. The inner pipe passes through both ends of the outer pipe, and a flue is formed inside the inner pipe. The interlayer between the inner pipe and the outer pipe is a water channel, which is connected to the connecting pipe 302. The outlet of the preheating box 101 is connected to a guide pipe 15, and the inlet of the evaporator 102 is connected to a guide pipe 16. The outlet of the guide pipe 15 is connected to the inlet of the upstream jacket pipe 301 through a connecting pipe 302, and the inlet of the guide pipe 16 is connected to the outlet of the downstream jacket pipe 301 through a connecting pipe 302.

[0022] The system has an information acquisition module, which includes an inlet temperature sensor 5, an outlet temperature sensor 6, a flow meter 7, an inlet pressure sensor 8, an outlet pressure sensor 9, and a steam dryness detector 10. The inlet and outlet of the sleeve assembly 3 are respectively connected to the inlet temperature sensor 5 and the outlet temperature sensor 6. The inlet of the sleeve assembly 3 is the connection point between the first guide pipe 15 and the corresponding connecting pipe 302, and the outlet of the sleeve assembly 3 is the connection point between the second guide pipe 16 and the corresponding connecting pipe 302. A heat insulation layer is provided on the parts of the inlet temperature sensor 5 and the outlet temperature sensor 6 other than their detection ends. The preferred model for both the inlet temperature sensor 5 and the outlet temperature sensor 6 is WZPK2-333. The system also includes a controller connected to an inlet temperature sensor 5 and an outlet temperature sensor 6. The inlet temperature sensor 5 is fixedly installed on the first guide tube 15, and the detection end of the inlet temperature sensor 5 extends to the inlet of the first guide tube 15 and the sleeve assembly 3. The outlet temperature sensor 6 is fixedly installed on the second guide tube 16, and the detection end of the outlet temperature sensor 6 extends to the outlet of the second guide tube 16 and the sleeve assembly 3.

[0023] Water supply pipeline 2 is connected to a flow meter 7 and an inlet pressure sensor 8. Steam pipe 4 is connected to an outlet pressure sensor 9 and a steam dryness detector 10. The preferred model for flow meter 7 is AFD4020, the preferred model for inlet pressure sensor 8 is ELE-801, the preferred model for outlet pressure sensor 9 is KY5007, and the preferred model for steam dryness detector 10 is SQ2000. Flow meter 7, inlet pressure sensor 8, outlet pressure sensor 9, and steam dryness detector 10 are all connected to a controller. Water supply pipeline 2 includes a water supply pump 201, an inlet pipe 202 located at the outlet of water supply pump 201, and a water supply pipe 203 located at the inlet of water supply pump 201. Water supply pump 201 is connected to preheating box 101 through inlet pipe 202. Flow meter 7 and inlet pressure sensor 8 are both installed on inlet pipe 202. The water supply line 2 is connected to a dosing pump 11. The inlet of the dosing pump 11 is connected to a storage tank, which is used to store scale inhibitor. The dosing pump 11 is used to pump the scale inhibitor into the water supply line 2 when scale forms on the furnace tube.

[0024] During the operation of the DC furnace, the information acquisition module of the monitoring system monitors various indicators of the furnace tubes in real time. The inlet temperature sensor 5 detects the inlet temperature of the heating section, and the outlet temperature sensor 6 detects the outlet temperature of the heating section; this heating section corresponds to the pipe section of the sleeve assembly 3. The flow rate of the inlet water pipe 202 is detected by the flow meter 7, the water pressure of the inlet water pipe 202 is detected by the inlet pressure sensor 8, the gas pressure at the outlet of the evaporation section is detected by the outlet pressure sensor 9, and the steam dryness at the outlet of the evaporation section is detected by the steam dryness meter 10; this evaporation section corresponds to the pipe section of the evaporation box 102.

[0025] After detecting the above information, the information acquisition module receives the detection results from the controller. When the temperature difference between the outlet and inlet of the evaporation section is less than the set temperature difference value, it indicates that scale has formed inside the casing group 3 of the furnace tube. When the flow rate of the inlet pipe 202 is lower than the set inlet flow rate value, it indicates that scale has formed in a section of the furnace tube. When the water pressure of the inlet pipe 202 is higher than the set water pressure value, it indicates that scale has formed in the inlet pipe 202 or the preheating box 101. When the steam pressure of the steam pipe 4 is lower than the set steam pressure value, it indicates that the heat transfer in the heating section or evaporation section is insufficient, and scale has formed in the heating section or evaporation section. When the above scaling conditions occur, the controller causes the dosing pump 11 to pump scale inhibitor into the feed water pipeline 2 to suppress the scaling phenomenon in the furnace tube. This avoids the occurrence of pipe bursts and prevents energy loss due to shutdown maintenance.

[0026] Specifically, such as Figure 2 As shown, the outlet of the dosing pump 11 in this system is connected to a dosing pipe 12. The dosing pump 11 is connected to the water supply pipe 203 of the water supply pipeline 2 via the dosing pipe 12. The dosing pipe 12 is equipped with a check valve 13 and a flow sensor 14. The flow sensor 14 is preferably an AFD4020 model. The flow sensor 14 is connected to a controller. The controller can detect the flow rate of the dosing pipe 12 through the flow sensor 14 in order to regulate the dosing pump 11.

[0027] Furthermore, such as Figure 3 As shown, a feed pipe 17 is installed through the side wall of the once-through furnace. This feed pipe 17 supplies fuel such as coal to the combustion chamber of the once-through furnace. The furnace tube scaling monitoring system also includes a valve 18 installed on the feed pipe 17. This valve 18 can be a butterfly valve or a gate valve. An exhaust pipe is provided on the steam pipe 4. The furnace tube scaling monitoring system also includes a valve 19 installed on the exhaust pipe. The valve 19 has a top cap 20 with a side opening, which serves as a dust preventer. An alarm 21 is also provided on the once-through furnace. When scaling is severe, the controller issues an alarm through the alarm 21 and closes the feed pipe 17 through valve 18 while simultaneously opening valve 19.

[0028] Specifically, when the temperature difference between the outlet and inlet of the evaporation section continues to decrease and falls below the temperature difference warning value, it indicates that a large amount of scale has formed inside the casing group 3 of the furnace tube. When the flow rate of the inlet water pipe 202 continues to decrease and falls below the inlet water flow warning value, it indicates that a large amount of scale has formed in a section of the furnace tube. When the water pressure of the inlet water pipe 202 continues to rise and rises above the water pressure warning value, it indicates that a large amount of scale has formed in the inlet water pipe 202 or the preheating box 101. When the steam pressure of the steam pipe 4 continues to decrease and falls below the steam pressure warning value, it indicates that a large amount of scale has formed in the heating section or the evaporation section. When the above situations occur, an alarm is triggered by the alarm 21, and the feed pipe 17 is closed by valve 18 to stop adding fuel to the once-through furnace. Valve 2 is opened to allow steam to be discharged, increasing the cooling rate and preventing insufficiently dry steam from being introduced into the generator.

[0029] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A scaling monitoring system for a DC furnace tube, wherein the furnace tube comprises a housing (1), a water supply pipeline (2) connected to the housing (1), a sleeve assembly (3), and a steam pipe (4), characterized in that: The system includes an inlet temperature sensor (5) and an outlet temperature sensor (6) respectively located at the inlet and outlet of the casing group (3), a flow meter (7) and an inlet pressure sensor (8) located on the water supply line (2), an outlet pressure sensor (9) and a steam dryness detector (10) located on the steam pipe (4), and a dosing pump (11) connected to the water supply line (2), the dosing pump (11) being used to pump scale inhibitor into the water supply line (2) when the furnace tube is scaled.

2. The DC furnace tube scaling monitoring system according to claim 1, characterized in that: The outlet of the dosing pump (11) is connected to a dosing pipe (12), and the dosing pump (11) is connected to the water supply pipeline (2) through the dosing pipe (12). A check valve (13) is provided on the dosing pipe (12).

3. The DC furnace tube scaling monitoring system according to claim 2, characterized in that: A flow sensor (14) is provided on the dosing tube (12).

4. The DC furnace tube scaling monitoring system according to claim 1, characterized in that: The box body (1) includes a preheating box (101) and an evaporating box (102). The preheating box (101) is provided with a first guide pipe (15), and the evaporating box (102) is provided with a second guide pipe (16). The preheating box (101) is connected to the inlet of the sleeve group (3) through the first guide pipe (15), and the second guide pipe (16) is connected to the outlet of the sleeve group (3). The inlet temperature sensor (5) and the outlet temperature sensor (6) are respectively installed on the first guide pipe (15) and the second guide pipe (16).

5. The DC furnace tube scaling monitoring system according to claim 4, characterized in that: The water supply pipeline (2) includes a water supply pump (201) and an inlet pipe (202) located at the outlet of the water supply pump (201), and a water supply pipe (203) located at the inlet of the water supply pump (201). The water supply pump (201) is connected to the preheating box (101) through the inlet pipe (202). The flow meter (7) and the inlet pressure sensor (8) are both located on the inlet pipe (202).

6. The scaling monitoring system for DC furnace tubes according to claim 1, characterized in that: The DC furnace is provided with a feed pipe (17) for supplying fuel on one side. The system also includes a valve (18) installed on the feed pipe (17).

7. The DC furnace tube scaling monitoring system according to claim 6, characterized in that: The steam pipe (4) is provided with an exhaust pipe, and the system also includes a valve two (19) provided on the exhaust pipe, and the valve two (19) is provided with a top cap (20) with a side opening.

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