Hearth negative pressure protection device and system

Abstract

The utility model relates to a hearth negative pressure protection device and system.The device comprises a first pressure unit, a second pressure unit, logic AND gate devices and a main combustion tripping MFT unit used for sending out a boiler fire extinguishing instruction, in the first pressure unit, each first pressure collecting unit is connected with a first logic gate device through a corresponding pressure switch, and each second pressure collecting unit is connected with a second logic gate device through a corresponding pressure switch; each second pressure acquisition unit is connected with a first logic gate device through a corresponding pressure transmitter and a conversion circuit in sequence, each pressure acquisition unit in the second pressure units is connected with a second logic gate device through a corresponding pressure switch, and the first logic gate device and the second logic gate device are further connected with a logic AND gate device; the first pressure unit and the second pressure unit are connected with the main combustion trip MFT unit through a logic AND gate device. Therefore, the reliability of boiler hearth negative pressure protection can be improved, the health condition of boiler operation can be accurately reflected, and the boiler safety is ensured.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a boiler protection technology in the power industry, in particular to a furnace negative pressure protection device and system. BACKGROUND

[0002] MFT (Main Fuel Trip) is an important part of boiler safety protection, which is used to quickly cut off the fuel into the furnace when necessary to avoid accidents. The furnace negative pressure, which is the internal pressure of the furnace, is an important parameter for the safe operation of the boiler. Therefore, how to properly collect the furnace negative pressure during the operation of the boiler so as to accurately reflect the health status of the boiler operation becomes the key to ensure the safety of the boiler. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present disclosure is to provide a furnace negative pressure protection device and system to accurately reflect the health status of the boiler operation and ensure the safe operation of the boiler.

[0004] In order to achieve the above purpose, the first aspect of the present disclosure provides a furnace negative pressure protection device, comprising a first pressure unit, a second pressure unit, a logic and gate device and a main fuel trip (MFT) unit for issuing a boiler extinguishing instruction:

[0005] The first pressure unit and the second pressure unit are connected with the main fuel trip (MFT) unit through the logic and gate device;

[0006] The first pressure unit comprises a first logic gate device, n first pressure collection units, m second pressure collection units, n pressure switches, m pressure transmitters and m conversion circuits; in the first pressure unit, each first pressure collection unit is connected with the first logic gate device through a corresponding pressure switch, each second pressure collection unit is connected with the first logic gate device through a corresponding pressure transmitter and conversion circuit in turn, and the first logic gate device is further connected with the logic and gate device, wherein the conversion circuit is used to convert analog quantity into switch quantity;

[0007] The second pressure unit comprises a second logic gate device, p pressure collection units and p pressure switches, each pressure collection unit in the second pressure unit is connected with the second logic gate device through a corresponding pressure switch, and the second logic gate device is further connected with the logic and gate device, wherein p is a positive integer greater than 1, and the sum of n and m is equal to the value of p.

[0008] Optionally, the first pressure acquisition unit in the first pressure unit and the pressure switch in the first pressure unit are one-to-one corresponding; the second pressure acquisition unit in the first pressure unit and the pressure transmitter in the first pressure unit are one-to-one corresponding; the pressure acquisition unit in the second pressure unit and the pressure switch in the second pressure unit are one-to-one corresponding.

[0009] Optionally, the first logic gate device is a first logic OR gate device, the value of n is 1, and the value of m is 1.

[0010] The first pressure unit comprises the first logic OR gate device, a first pressure acquisition unit, a second pressure acquisition unit, a first pressure switch, a first pressure transmitter and a first conversion circuit, the first pressure acquisition unit is connected with the first logic OR gate device through the first pressure switch, and the second pressure acquisition unit is connected with the first logic OR gate device in sequence through the first pressure transmitter and the first conversion circuit.

[0011] Optionally, the second logic gate device is a second logic OR gate device, and the value of p is 2.

[0012] The second pressure unit comprises a third pressure acquisition unit, a fourth pressure acquisition unit, a second pressure switch, a third pressure switch and the second logic OR gate device, wherein the third pressure acquisition unit is connected with the second logic OR gate device through the second pressure switch, the fourth pressure acquisition unit is connected with the second logic OR gate device through the third pressure switch, and the second logic OR gate device is connected with the logic AND gate device.

[0013] Optionally, the first pressure acquisition unit and the third pressure acquisition unit are located at different sides of the furnace, and the second pressure acquisition unit and the fourth pressure acquisition unit are located at different sides of the furnace.

[0014] Optionally, the first pressure acquisition unit and the second pressure acquisition unit are located at the same side of the furnace, and the third pressure acquisition unit and the fourth pressure acquisition unit are located at the same side of the furnace.

[0015] The second aspect of the present disclosure provides a furnace negative pressure protection system comprising the furnace negative pressure protection device provided by the first aspect of the present disclosure.

[0016] Optionally, the furnace negative pressure protection system further comprises an execution unit connected with the main combustion tripping (MFT) unit, and the execution unit is configured to cut off the fuel supply into the furnace in response to receiving a boiler fire extinguishing instruction.

[0017] Optionally, the furnace negative pressure protection system further comprises a terminal device connected with the main combustion trip (MFT) unit, and the terminal device is configured to display the boiler extinguishing instruction and a fuel supply state of the furnace.

[0018] Optionally, the terminal device further comprises a wireless communication unit configured to, upon receiving the boiler extinguishing instruction, generate prompt information for prompting a user to extinguish the boiler, and send the prompt information to a pre-bound mobile device.

[0019] In the above technical solution, in the first pressure unit, each first pressure acquisition unit is connected with the first logic gate device through a corresponding pressure switch, and each second pressure acquisition unit is connected with the first logic gate device through a corresponding pressure transmitter and a conversion circuit in sequence, in the second pressure unit, each pressure acquisition unit is connected with the second logic gate device through a corresponding pressure switch, the first logic gate device and the second logic gate device are further connected with a logic AND gate device, and the first pressure unit and the second pressure unit are connected with the main combustion trip (MFT) unit through the logic AND gate device. In this way, the reliability of the boiler furnace negative pressure protection can be improved by forming multiple sampling branches, the health status of the boiler operation can be accurately reflected, and the safety of the boiler can be ensured; and the existing boiler equipment is usually provided with a pressure transmitter and a conversion circuit, and the furnace negative pressure protection device of the present disclosure can reuse the existing pressure transmitter and conversion circuit in the boiler equipment, thereby realizing low-cost modification of the existing furnace negative pressure protection device.

[0020] Other features and advantages of the present disclosure will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation of the present disclosure.

[0022] Figure 1 is a block diagram of a furnace negative pressure protection device provided by an exemplary embodiment of the present disclosure.

[0023] Figure 2 is a block diagram of a furnace negative pressure protection device provided by an exemplary embodiment of the present disclosure.

[0024] Figure 3 is a block diagram of a furnace negative pressure protection system provided by an exemplary embodiment of the present disclosure.

[0025] LEGEND OF DRAWINGS

[0026] DETAILED DESCRIPTION

[0027] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0028] Figure 1 is a block diagram of a furnace negative pressure protection device provided by an exemplary embodiment of the present disclosure. As shown in Figure 1 the furnace negative pressure protection device includes a first pressure unit 11, a second pressure unit 12, a logic and gate device 13, and a main combustion trip (MFT) unit 14 for issuing a boiler fire extinguishing instruction; wherein the first pressure unit 11 includes a first logic gate device, n first pressure acquisition units, m second pressure acquisition units, n pressure switches, m pressure transmitters, and m conversion circuits; the second pressure unit 12 includes a second logic gate device, p pressure acquisition units, and p pressure switches; p is a positive integer greater than 1, and the sum of n and m is equal to the value of p; the conversion circuit is used to convert an analog quantity into a switching quantity.

[0029] The first pressure unit 11 and the second pressure unit 12 are connected with the main combustion trip (MFT) unit 14 through the logic and gate device 13;

[0030] In the first pressure unit 11, each first pressure acquisition unit is connected with the first logic gate device through a corresponding pressure switch, and each second pressure acquisition unit is connected with the first logic gate device through a corresponding pressure transmitter and a conversion circuit in turn, and the first logic gate device is further connected with the logic and gate device 13;

[0031] In the second pressure unit 12, each pressure acquisition unit is connected with the second logic gate device through a corresponding pressure switch, and the second logic gate device is further connected with the logic and gate device 13.

[0032] Specifically, taking the values of n and m as 1 for example, the output end of the first logic gate device is connected with the first input end of the logic and gate device 13, the output end of the second logic gate device is connected with the second input end of the logic and gate device 13, and the output end of the logic and gate device 13 is connected with the main combustion trip (MFT) unit 14.

[0033] For example, the pressure switches in the furnace negative pressure protection device 10 are all used to trigger when the pressure collected by the corresponding pressure collection unit is greater than the corresponding upper pressure threshold, and the conversion circuit is used to send a switch quantity signal representing triggering when the pressure collected by the corresponding pressure collection unit is greater than the corresponding upper pressure threshold, so as to realize high-high protection of the boiler furnace pressure. For another example, the pressure switches in the furnace negative pressure protection device 10 are all used to trigger when the pressure collected by the corresponding pressure collection unit is less than the corresponding lower pressure threshold, and the conversion circuit is used to send a switch quantity signal representing triggering when the pressure collected by the corresponding pressure collection unit is less than the corresponding lower pressure threshold, so as to realize low-low protection of the boiler furnace pressure.

[0034] When both the first pressure unit 11 and the second pressure unit 12 represent furnace negative pressure abnormalities, the logic AND device 13 sends an enabling signal to the main combustion trip MFT unit 14, so that the main combustion trip MFT unit 14 sends a boiler fire extinguishing instruction. When only one of the first pressure unit 11 and the second pressure unit 12 represents a furnace negative pressure abnormality, the logic AND device 13 does not send an enabling signal to the main combustion trip MFT unit 14. In this way, the possibility of false operation can be reduced, and the reliability of the boiler furnace negative pressure protection can be improved.

[0035] In the formula, p is a positive integer greater than 1, and the sum of n and m is equal to the value of p, that is, the furnace negative pressure protection device 10 provided by the present disclosure includes at least four sampling branches. At present, the high-high and low-low protection signals of the boiler furnace pressure usually adopt a "two out of three" logic judgment mode. In the furnace negative pressure protection device 10 provided by the present disclosure, more sampling branches can also improve the reliability of the boiler furnace negative pressure protection.

[0036] In addition, in order to ensure the reliability of the signal, the signal follows the principle of relative independence from the sampling point to the input module (logic gate device). At present, the sampling branch is usually composed of a pressure collection unit and a pressure switch. The cost of adding such a sampling branch is relatively high. The furnace negative pressure protection device 10 of the present disclosure can realize low-cost modification of the existing furnace negative pressure protection device by multiplexing the existing pressure transmitters and conversion circuits in the boiler equipment, and replacing the pressure switch with the pressure transmitter and the conversion circuit to realize the corresponding function.

[0037] In the above technical solution, in the first pressure unit 11, each first pressure acquisition unit 111 is connected with the first logic gate device through a corresponding pressure switch, and each second pressure acquisition unit 113 is connected with the first logic gate device through a corresponding pressure transmitter and a conversion circuit in sequence, in the second pressure unit 12, each pressure acquisition unit is connected with the second logic gate device through a corresponding pressure switch, the first logic gate device and the second logic gate device are further connected with the logic and gate device 13, and the first pressure unit 11 and the second pressure unit 12 are connected with the main combustion trip MFT unit 14 through the logic and gate device 13. In this way, the reliability of the boiler furnace negative pressure protection can be improved by forming a plurality of sampling branches, the health status of the boiler operation can be accurately reflected, and the operation safety of the boiler can be ensured; and the existing boiler equipment is usually provided with a pressure transmitter and a conversion circuit, and the furnace negative pressure protection device of the present disclosure can reuse the existing pressure transmitter and conversion circuit in the boiler equipment, thereby realizing low-cost modification of the existing furnace negative pressure protection device.

[0038] Optionally, the first pressure acquisition unit in the first pressure unit 11 and the pressure switch in the first pressure unit 11 correspond to each other in a one-to-one manner; the second pressure acquisition unit in the first pressure unit 11 and the pressure transmitter in the first pressure unit 11 correspond to each other in a one-to-one manner; and the pressure acquisition unit in the second pressure unit 12 and the pressure switch in the second pressure unit 12 correspond to each other in a one-to-one manner.

[0039] Optionally, the first logic gate device is a first logic or gate device 116, the value of n is 1, and the value of m is 1. As shown in Figure 2 The first pressure unit 11 includes a first logic or gate device 116, a first pressure acquisition unit 111, a second pressure acquisition unit 113, a first pressure switch 112, a first pressure transmitter 114, and a first conversion circuit 115, the first pressure acquisition unit 111 is connected with the first logic or gate device 116 through the first pressure switch 112, and the second pressure acquisition unit 113 is connected with the first logic or gate device 116 through the first pressure transmitter 114 and the first conversion circuit 115 in sequence.

[0040] The one end of the first pressure switch 112 is connected with the first pressure collecting unit 111, the other end of the first pressure switch 112 is connected with the first input end of the first logic or gate device 116, one end of the first conversion circuit 115 is connected with the second pressure collecting unit 113 through the first pressure transmitter 114, the other end of the first conversion circuit 115 is connected with the second input end of the first logic or gate device 116, and the output end of the first logic or gate device 116 is connected with the first input end of the logic and gate device 13. In this way, when the data collected by any pressure collecting unit in the first pressure unit 11 is abnormal, the first logic or gate device 116 can output the corresponding trigger signal, so as to improve the reliability of the output signal of the first pressure unit 11.

[0041] Optionally, the second logic gate device is a second logic or gate device 125, and the value of p is 2. As shown in the figure, Figure 2 The second pressure unit 12 includes a third pressure collecting unit 121, a fourth pressure collecting unit 123, a second pressure switch 122, a third pressure switch 124 and a second logic or gate device 125, wherein the third pressure collecting unit 121 is connected with the second logic or gate device 125 through the second pressure switch 122, the fourth pressure collecting unit 123 is connected with the second logic or gate device 125 through the third pressure switch 124, and the second logic or gate device 125 is connected with the logic and gate device 13.

[0042] The one end of the second pressure switch 122 is connected with the third pressure collecting unit 121, the other end of the second pressure switch 122 is connected with the first input end of the second logic or gate device 125, one end of the third pressure switch 124 is connected with the fourth pressure collecting unit 123, the other end of the third pressure switch 124 is connected with the second input end of the second logic or gate device 125, and the output end of the second logic or gate device 125 is connected with the second input end of the logic and gate device 13. In this way, when the data collected by any pressure collecting unit in the second pressure unit 12 is abnormal, the second logic or gate device 125 can output the corresponding trigger signal, so as to improve the reliability of the output signal of the second pressure unit 12.

[0043] Optionally, the first pressure collecting unit 111 and the third pressure collecting unit 121 are located at different sides of the furnace, the second pressure collecting unit 113 and the fourth pressure collecting unit 123 are located at different sides of the furnace, the first pressure collecting unit 111 and the second pressure collecting unit 113 are located at the same side of the furnace, and the third pressure collecting unit 121 and the fourth pressure collecting unit 123 are located at the same side of the furnace.

[0044] In the operation of the furnace negative pressure protection device 10, when the data collected by the same-side pressure collection unit is abnormal, the protection is not triggered, and when the data collected by the different-side pressure collection unit is abnormal, the protection is triggered, so that the reliability of the protection of the furnace negative pressure protection device 10 can be improved, the hidden danger of false operation can be eliminated, and the safety and stability of the unit can be ensured.

[0045] The furnace negative pressure protection system provided by the example embodiment of the present disclosure is shown in FIG. 1. As shown in FIG. 1, the furnace negative pressure protection system can include the furnace negative pressure protection device 10, an execution unit 20 connected with a main combustion tripping (MFT) unit 14, and a terminal device 30 connected with the MFT unit 14.

[0046] Figure 3 The furnace negative pressure protection system provided by the example embodiment of the present disclosure is shown in FIG. 1. As shown in FIG. 1, the furnace negative pressure protection system can include the furnace negative pressure protection device 10, an execution unit 20 connected with a main combustion tripping (MFT) unit 14, and a terminal device 30 connected with the MFT unit 14. Figure 3

[0047] The execution unit 20 is configured to cut off the fuel supply into the furnace in response to receiving the boiler fire extinguishing instruction.

[0048] The terminal device 30 is configured to display the boiler fire extinguishing instruction and the fuel supply state of the furnace.

[0049] In this way, whether to cut off the fuel supply into the furnace can be controlled by the execution unit 20, so that the fuel supply into the furnace can be timely cut off in the case of receiving the boiler fire extinguishing instruction, and accidents can be avoided. The boiler operation state can be understood by relevant personnel in time by displaying the boiler fire extinguishing instruction and the fuel supply state of the furnace by the terminal device 30. For example, the terminal device 30 can be a computer.

[0050] Optionally, the terminal device 30 can further include a wireless communication unit configured to generate prompt information for prompting a user to extinguish the boiler fire and send the prompt information to a pre-bound mobile device when the boiler fire extinguishing instruction is received.

[0051] The portability of the mobile device enables the user to access and process information at any place and at any time, and such anytime and anywhere access capability greatly increases flexibility and convenience. Therefore, the prompt information can be sent to the pre-bound mobile device by the wireless communication unit of the terminal device 30, so that the user can receive information anytime and anywhere, and work efficiency can be improved.

[0052] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. ​

[0053] It should also be noted that any technically possible combination of the various technical features described in the above embodiments can be made, without contradiction. In order to avoid unnecessary repetition, the disclosure does not describe each possible combination of the various technical features.

[0054] Furthermore, any combination of the various different embodiments of the disclosure can also be made, as long as it does not contradict the idea of the disclosure, it should also be considered as disclosed by the disclosure.

Claims

1. A furnace underpressure protection device, characterized by, The first pressure unit, the second pressure unit, a logical and gate device and a main combustion trip (MFT) unit for issuing a boiler flame-out command are included: The first pressure unit and the second pressure unit are connected with the main combustion trip (MFT) unit through the logical and gate device; The first pressure unit includes a first logical gate device, n first pressure acquisition units, m second pressure acquisition units, n pressure switches, m pressure transmitters and m conversion circuits; in the first pressure unit, each first pressure acquisition unit is connected with the first logical gate device through a corresponding pressure switch, each second pressure acquisition unit is connected with the first logical gate device through a corresponding pressure transmitter and conversion circuit in turn, and the first logical gate device is further connected with the logical and gate device, wherein the conversion circuit is used for converting an analog quantity into a switching quantity; The second pressure unit includes a second logical gate device, p pressure acquisition units and p pressure switches; in the second pressure unit, each pressure acquisition unit is connected with the second logical gate device through a corresponding pressure switch, and the second logical gate device is further connected with the logical and gate device, wherein p is a positive integer greater than 1, and the sum of n and m is equal to the value of p.

2. The furnace negative pressure protection device according to claim 1, characterized in that: The first pressure acquisition units in the first pressure unit and the pressure switches in the first pressure unit correspond to each other one by one; the second pressure acquisition units in the first pressure unit and the pressure transmitters in the first pressure unit correspond to each other one by one; The pressure acquisition units in the second pressure unit and the pressure switches in the second pressure unit correspond to each other one by one.

3. The furnace underpressure protection device according to claim 1, characterized in that The first logical gate device is a first logical or gate device, the value of n is 1, and the value of m is 1; The first pressure unit includes the first logical or gate device, a first pressure acquisition unit, a second pressure acquisition unit, a first pressure switch, a first pressure transmitter and a first conversion circuit; the first pressure acquisition unit is connected with the first logical or gate device through the first pressure switch, and the second pressure acquisition unit is connected with the first logical or gate device through the first pressure transmitter and the first conversion circuit in turn.

4. The furnace underpressure protection device according to claim 3, characterized in that The second logical gate device is a second logical or gate device, and the value of p is 2; The second pressure unit includes a third pressure acquisition unit, a fourth pressure acquisition unit, a second pressure switch, a third pressure switch and the second logical or gate device; the third pressure acquisition unit is connected with the second logical or gate device through the second pressure switch, the fourth pressure acquisition unit is connected with the second logical or gate device through the third pressure switch, and the second logical or gate device is connected with the logical and gate device.

5. The furnace underpressure protection device according to claim 4, characterized in that The first pressure acquisition unit and the third pressure acquisition unit are located at different sides of the furnace, and the second pressure acquisition unit and the fourth pressure acquisition unit are located at different sides of the furnace.

6. The furnace underpressure protection device according to claim 4, characterized in that The first pressure collecting unit and the second pressure collecting unit are located at the same side of the furnace, and the third pressure collecting unit and the fourth pressure collecting unit are located at the same side of the furnace.

7. A furnace underpressure protection system, characterized in that The furnace negative pressure protection device comprises a furnace negative pressure protection system and a terminal device connected to the furnace negative pressure protection system.

8. The furnace underpressure protection system of claim 7, wherein The furnace negative pressure protection system further comprises an execution unit connected to the main combustion tripping MFT unit, and the execution unit is configured to cut off the fuel supply into the furnace in response to receiving a boiler fire extinguishing instruction.

9. The furnace underpressure protection system of claim 8, wherein, The furnace negative pressure protection system further comprises a terminal device connected to the main combustion tripping MFT unit, and the terminal device is configured to display the boiler fire extinguishing instruction and the fuel supply state of the furnace.

10. The furnace underpressure protection system of claim 9, wherein, The terminal device further comprises a wireless communication unit configured to generate prompt information for prompting the user to extinguish the boiler fire when the boiler fire extinguishing instruction is received, and send the prompt information to a pre-bound mobile device.

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