Novel automatic blowdown device for waste heat power generation boiler

Abstract

The utility model belongs to the technical field of boiler blow-off, and particularly relates to a novel automatic blow-off device for a waste heat power generation boiler, which comprises blow-off pipelines, a control system, a detection device, a sampling pipeline and an electric valve, a plurality of blow-off pipelines are connected onto the waste heat boiler, and the sampling pipeline is also connected onto the waste heat boiler. An electrically operated valve is arranged on each blow-off pipeline, the detection device is connected to the sampling pipeline, the electrically operated valves and the detection device are electrically connected with the control system, and the electrically operated valves are sequentially and circularly opened. The detection device reflects the state of boiler water in the boiler in real time, when impurities in the boiler are increased to a certain value, the detection device feeds back a signal to the control system, and the control system controls the electric valves on the blow-off pipelines to be sequentially and circularly opened for blow-off. The pollution discharge efficiency is greatly improved, and the safe operation of boiler equipment is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler sewage discharge, and in particular relates to a novel automatic sewage discharge device for waste heat power generation boiler. Background Art

[0002] Waste heat boilers are widely used in industrial production. In daily industrial production, the heat from exhaust gases can be used to generate electricity, thereby reducing factory electricity costs. Blowdown is a crucial aspect of waste heat boiler operation, and its quality directly impacts the safety and service life of the boiler. Insufficient blowdown can cause scaling within the furnace, leading to tube bursts. Excessive blowdown can cause significant heat loss within the furnace, reducing the economic efficiency of power generation.

[0003] At present, boiler blowdown in most factories needs to be completed manually. Regular boiler water sampling is used to detect the salt content in the boiler water to determine whether high-salt boiler water blowdown is needed. Due to the regular testing, the salt content of the boiler water may increase but it cannot be detected in time. Sometimes the test results are inaccurate, resulting in unclear boiler water blowdown, which in turn delays the boiler water blowdown. At the same time, the operator manually closes the valve slowly, which is very likely to cause excessive blowdown and heat loss in the furnace. Under such working conditions, the operator's labor intensity is high, the time cost is high, and it is easy to cause operational errors.

[0004] Therefore, the existing manual control method of boiler blowdown is not only labor-intensive for operators, but also extremely inefficient, unable to discharge blowdown in a timely and accurate manner, and the safe operation of the equipment cannot be guaranteed. In addition, the boiler water detection link before boiler blowdown is complicated, which seriously affects the timeliness of boiler blowdown. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a novel automatic sewage discharge device for waste heat power generation boiler, which realizes automatic sewage discharge, reduces the labor intensity of operators, and improves sewage discharge efficiency.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a new type of automatic sewage discharge device for waste heat power generation boiler, including a sewage discharge pipe, a control system, a detection device, a sampling pipe and an electric valve. Several sewage discharge pipes are connected to the waste heat boiler, and the sampling pipe is also connected to the waste heat boiler. An electric valve is provided on each sewage discharge pipe, and the detection device is connected to the sampling pipe. The electric valve and the detection device are electrically connected to the control system, and several of the electric valves are opened in a cycle in sequence.

[0007] Preferably, the detection device is a densitometer.

[0008] Preferably, the control system includes a PLC controller and a DCS control interface, the PLC controller and the DCS control interface are electrically connected, the detection device is electrically connected to the DCS control interface, and each electric valve is electrically connected to the PLC controller and the DCS control interface.

[0009] Preferably, the control system includes a PLC controller, which is arranged on the outside of the waste heat boiler, and the detection device and each electric valve are electrically connected to the PLC controller.

[0010] Preferably, the control system further comprises a DCS control interface, the DCS control interface is electrically connected to the PLC controller, and the detection device and each electric valve are also electrically connected to the DCS control interface.

[0011] Preferably, each of the sewage pipes is provided with a manual stop valve, and the manual stop valve is set to a normally open state.

[0012] Preferably, the ends of the plurality of sewage pipes are connected to the sewage main pipe.

[0013] Compared with the existing technology, the above technical solution has the following beneficial effects:

[0014] 1. The detection device is used to reflect the status of the boiler water in real time. When the impurities in the furnace increase to a certain value, the detection device feeds back a signal to the control system. The control system controls the electric valves on each sewage pipe to open in sequence for sewage discharge. The automatic sewage discharge device of this utility model not only eliminates the complicated manual links and reduces the labor intensity of the operators, but also greatly improves the sewage discharge efficiency, so that the safe operation of the boiler equipment is guaranteed.

[0015] 2. A manual stop valve is installed on each sewage pipe. When the electric valve fails, the manual stop valve can be used to control whether the sewage pipe is open for discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of Example 1 of the present utility model.

[0017] Figure 2 This is an enlarged view of part of the structure of Example 1 of the present utility model.

[0018] Figure 3 This is a structural diagram of the second embodiment of the present utility model.

[0019] Figure 4 This is a structural diagram of setting up a DCS control interface in Example 2 of the present utility model.

[0020] Among them: 1. Waste heat boiler 2. PLC controller 3. Density meter 4. Manual stop valve 5. Electric valve 6. Sewage pipe 7. Sewage main pipe 8. DCS control interface 9. Sampling pipe. DETAILED DESCRIPTION

[0021] Figures 1 to 4 This is the best embodiment of the present invention, Figures 1 to 4 The utility model is further described.

[0022] Example 1

[0023] like Figure 1 As shown, the utility model is a new type of automatic sewage discharge device for waste heat power generation boiler, including a sewage pipe 6, a control system, a detection device, a sampling pipe 9 and an electric valve 5. Several sewage pipes 6 are connected to the waste heat boiler 1, and the sampling pipe 9 is also connected to the waste heat boiler 1. An electric valve 5 is provided on each sewage pipe 6. The electric valve 5 controls whether the sewage pipe 6 is opened to discharge sewage. The electric valve 5 and the detection device are electrically connected to the control system. The boiler water in the sampling pipe 9 can reflect the condition of the boiler water in the waste heat boiler 1. The detection device detects the boiler water in the sampling pipe 9, and the detection device transmits a signal to the control system. The control system issues an instruction to control the several electric valves 5 to open in sequence.

[0024] like Figure 2 As shown, the detection device in this embodiment is a densitometer 3, which reflects changes in the salt content of the furnace water. When impurities in the furnace increase, the density of the furnace water increases. When the density of the furnace water measured by the densitometer 3 reaches a certain threshold, the control system issues a command to open the electric valve 5. The high temperature in the furnace makes the densitometer 3 inoperable. Here, the density of the furnace water in the sampling tube 9 can reflect the density of the furnace water. In other embodiments, the detection device can also be a conductivity meter, which determines whether sewage discharge is necessary by measuring the conductivity of the furnace water.

[0025] A manual stop valve 4 is also provided on each sewage pipe 6. All manual stop valves 4 are set to a normally open state. When the electric valve 5 fails and cannot be closed, the manual stop valve 4 is manually closed to prevent excessive discharge and prevent waste of resources. Finally, the ends of all sewage pipes 6 are connected to a sewage main pipe 7 for discharge.

[0026] In this embodiment, the control system includes a PLC controller 2 and a DCS control interface 8. The PLC controller 2 is arranged outside the waste heat boiler 1. The PLC controller 2 and the DCS control interface 8 are electrically connected. The density meter 3 is electrically connected to the DCS control interface 8. Each electric valve 5 is electrically connected to the PLC controller 2 and the DCS control interface 8. The density meter 3 transmits a density signal to the DCS control interface 8. The DCS control interface 8 determines the density signal and controls the PLC controller 2 to issue an instruction.

[0027] Specifically, the DCS control interface 8 can select between a fully automatic sewage discharge mode and a semi-automatic sewage discharge mode. When the operator selects the fully automatic sewage discharge mode, the densitometer 3 transmits a density signal to the DCS control interface 8, which determines whether sewage discharge is required. When the density signals transmitted by the densitometer 3 have reached the threshold, the DCS control interface 8 controls the PLC controller 2 to issue an instruction, which in turn controls the electric valve 5 on the first sewage discharge pipe 6 to open and discharge sewage. The electric valve 5 on the first sewage discharge pipe 6 opens for 30 seconds and then closes. Then, the electric valve 5 on the second sewage discharge pipe 6 opens for 30 seconds and then closes. This cycle continues until the sewage is discharged from the last sewage discharge pipe 6.

[0028] When the operator selects the semi-automatic sewage discharge mode, the operator operates in real time through the DCS control interface 8. The operator chooses whether to discharge sewage based on the information fed back by the density meter 3. If necessary, the operator can accurately set the opening time of the electric valve 5 of all sewage discharge pipes 6. The sewage discharge time of the pipe without a set sewage discharge time will execute the sewage discharge time set for the previous pipe.

[0029] When the present invention is in use, the density meter 3 transmits a signal to the control system, and the control system issues an instruction to control the opening of each electric valve 5. When the operator selects the fully automatic sewage discharge mode, the density meter 3 transmits the density signal to the DCS control interface 8, and the DCS control interface 8 determines whether sewage discharge is required. The sewage discharge process in this mode is more intelligent, which greatly saves labor costs. When the operator selects the semi-automatic sewage discharge mode, the operator operates in real time through the DCS control interface 8. The operator selects whether sewage discharge is required based on the information fed back by the density meter 3. The sewage discharge in this mode is more accurate and causes less waste.

[0030] Example 2

[0031] like Figures 3 and 4As shown, the control system in this embodiment is a PLC controller 2, which is arranged on the outside of the waste heat boiler 1. The density meter 3 and each electric valve 5 are electrically connected to the PLC controller 2. The signal of the density meter 3 is transmitted to the PLC controller 2, and the PLC controller 2 receives the signal and determines that when the density signal transmitted by the density meter 3 has reached the threshold, the PLC controller 2 issues an instruction to control the electric valve 5 on the set first sewage pipe 6 to open for sewage discharge. The electric valve 5 on the first sewage pipe 6 is opened for 30 seconds and then closed, and then the electric valve 5 on the second sewage pipe 6 is opened for 30 seconds and then closed, and the cycle is repeated until the sewage is discharged from the last sewage pipe 6.

[0032] The control system in this embodiment can also be provided with a DCS control interface 8, which is electrically connected to the PLC controller 2, and the density meter 3 and each electric valve 5 are also electrically connected to the DCS control interface 8. The DCS control interface 8 can select a fully automatic sewage discharge mode and a semi-automatic sewage discharge mode. When the operator selects the fully automatic sewage discharge mode, the DCS control interface 8 only receives the density signal without issuing a control instruction. The PLC controller 2 receives the signal and issues a corresponding instruction to control the opening of each electric valve 5 after judgment; when the operator selects the semi-automatic sewage discharge mode, the PLC controller 2 only receives the density signal from the density meter 3 without issuing a control instruction. The operator operates in real time through the DCS control interface 8. The operator chooses whether sewage discharge is required based on the information fed back by the density meter 3. The operator can accurately set the opening time of the electric valves 5 of all sewage pipes 6. The sewage discharge time of the pipe without a sewage discharge time setting will execute the sewage discharge time set for the previous pipe.

[0033] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation thereto. Any person skilled in the art may utilize the above disclosure to modify or remodel the present invention into equivalent embodiments. However, any simple modification, equivalent variation, or modification of the above embodiment that does not depart from the technical content of the present invention and is based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A new type of automatic sewage discharge device for waste heat power generation boiler, characterized by: The invention comprises a sewage pipe (6), a control system, a detection device, a sampling pipe (9) and an electric valve (5); a plurality of sewage pipes (6) are connected to a waste heat boiler (1); a sampling pipe (9) is also connected to the waste heat boiler (1); an electric valve (5) is provided on each sewage pipe (6); the detection device is connected to the sampling pipe (9); the electric valve (5) and the detection device are both electrically connected to the control system; the plurality of electric valves (5) are opened in a cycle in sequence; a manual stop valve (4) is provided on each sewage pipe (6); and the manual stop valve (4) is set to a normally open state.

2. According to claim 1, the novel automatic sewage discharge device for waste heat power generation boiler is characterized by: The detection device is a densitometer (3).

3. According to claim 1, the novel automatic sewage discharge device for waste heat power generation boiler is characterized by: The control system comprises a PLC controller (2) and a DCS control interface (8), the PLC controller (2) and the DCS control interface (8) are electrically connected, the detection device is electrically connected to the DCS control interface (8), and each electric valve (5) is electrically connected to the PLC controller (2) and the DCS control interface (8).

4. According to claim 1, the novel automatic sewage discharge device for waste heat power generation boiler is characterized by: The control system comprises a PLC controller (2), the PLC controller (2) being arranged outside the waste heat boiler (1), and the detection device and each electric valve (5) being electrically connected to the PLC controller (2).

5. According to claim 4, the novel automatic sewage discharge device for waste heat power generation boiler is characterized in that: The control system further comprises a DCS control interface (8), the DCS control interface (8) being electrically connected to the PLC controller (2), and the detection device and each electric valve (5) are also electrically connected to the DCS control interface (8).

6. The novel automatic sewage discharge device for waste heat power generation boiler according to claim 1 is characterized by: The ends of the plurality of sewage pipes (6) are connected to the sewage main pipe (7).

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