A method and device for monitoring the wall temperature of a gasifier

Abstract

The invention discloses a wall temperature monitoring method for a gasifier furnace wall, and relates to the field of wall temperature monitoring. The method obtains a laser emission signal; emits a variable-frequency pulse pump light and a fixed-frequency continuous detection light through the laser emission signal; and injects the pulse pump light and the fixed-frequency continuous detection light into a high-temperature optical cable laid on the furnace wall of the gasifier through a first optical fiber and a second optical fiber respectively; adjusts the optical frequency of the pulse pump light, and when the frequency difference between the pulse pump light and the continuous detection light falls into a first preset frequency shift range, obtains the optical power of the pulse pump light and the continuous detection light, and obtains the frequency shift of the pulse pump light and the continuous detection light through the optical power; obtains the temperature information at each position on the high-temperature optical cable according to the frequency shift; and solves the technical problems that the current thermocouple cannot cover the entire surface furnace wall and thus cannot fully measure the furnace wall temperature, the cable temperature measurement cannot be accurately positioned, and the infrared thermal imager has high requirements for on-site installation, and there may be blind spots in monitoring the gasifier outer wall temperature.

Description

Technical Field

[0001] The invention relates to the field of wall temperature monitoring, and in particular to a method and a device for monitoring the wall temperature of a gasifier furnace. Background Art

[0002] The gasifier is an important reaction equipment in the gasification device. The refractory bricks of the gasifier combustion chamber lining will melt under high temperature conditions, and the refractory bricks will become thinner due to the erosion of heated gas and molten slag. In some cases, the refractory bricks will fall off, and the hot gas will penetrate through the brick seams to increase the surface temperature of the gasifier furnace wall, reduce the strength of the compressed metal shell of the gasifier, and the gasifier wall will be deformed by force. Therefore, in order to ensure the normal, safe and effective operation of the gasifier, it is necessary to monitor the surface temperature of the furnace wall in real time and alarm for over-temperature, so as to judge the actual working condition of the refractory bricks. Surface thermocouples, gasifier surface cable temperature measurement and infrared thermal imagers are the three main measurement methods for gasifier furnace wall surface temperature measurement. Among them, surface thermocouples are mainly used. However, thermocouples often cannot cover the entire surface furnace wall and cannot fully measure the furnace wall temperature; cable temperature measurement cannot accurately locate; infrared thermal imagers have high requirements for on-site installation, and there may be blind spots in monitoring the outer wall temperature of the gasifier. In order to solve the above technical problems, the present invention proposes a method and device for monitoring the wall temperature of a gasifier wall. Summary of the invention

[0003] In order to solve the technical problems that the thermocouple cannot cover the entire surface of the furnace wall and thus cannot fully measure the furnace wall temperature, the cable temperature measurement cannot be accurately positioned, and the infrared thermal imager has high requirements for on-site installation, and there may be blind spots in monitoring the outer wall temperature of the gasifier, the present invention proposes a wall temperature monitoring method for the gasifier furnace wall, comprising:

[0004] Acquire a laser emission signal; emit a variable frequency pulse pump light and a fixed frequency continuous detection light through the laser emission signal; and inject them into a high temperature optical cable laid on the wall of the gasifier through a first optical fiber and a second optical fiber respectively;

[0005] Adjust the optical frequency of the pulse pump light, and when the frequency difference between the pulse pump light and the continuous detection light falls into a first preset frequency shift range, obtain the optical power of the pulse pump light and the continuous detection light, and obtain the frequency shift of the pulse pump light and the continuous detection light through the optical power; obtain the temperature information at each position on the high-temperature optical cable according to the frequency shift;

[0006] When the temperature value at any position on the high-temperature optical cable exceeds a preset temperature threshold or the temperature rise at that position exceeds a preset temperature rise threshold within a preset time, an interlock signal is generated;

[0007] The gasifier feed is stopped according to the interlock signal.

[0008] Furthermore, the monitoring method also includes:

[0009] Obtaining temperature values ​​of preset interval positions through temperature information at various positions on the high-temperature optical cable;

[0010] Determine whether the temperature value of the preset interval position point is within the preset temperature range. If so, generate corresponding preset alarm information according to the temperature value, and issue an alarm through the preset alarm information.

[0011] Furthermore, the monitoring method also includes:

[0012] When any of the temperature values ​​at the preset interval position points exceeds the preset temperature value, and the temperature rise within the preset time reaches any preset temperature rise value in the preset temperature rise value set, the corresponding preset alarm information is generated according to the preset temperature rise value, and an alarm is issued according to the preset alarm information.

[0013] Furthermore, the monitoring method also includes:

[0014] The temperature values ​​of the previously preset positions are obtained in descending order through the temperature values ​​of the preset interval positions and displayed.

[0015] The present invention also proposes a wall temperature monitoring device for a gasifier furnace wall, comprising: a high-temperature optical cable, a single-mode optical cable, a first optical switch, a second optical switch, a temperature measurement module, an industrial computer, a DCS host, a relay, and a SIS module;

[0016] The single-mode optical cable includes a first optical fiber and a second optical fiber, and the temperature measurement module includes a pulse laser emission interface and a continuous laser emission interface;

[0017] The high-temperature optical cable is laid on the surface of the furnace wall of the gasifier in a preset manner, and the industrial computer is connected to the temperature measurement module; the temperature measurement module uses the laser emission signal transmitted by the industrial computer to make the pulse laser emission interface and the continuous laser emission interface emit pulse pump light with a variable frequency and continuous detection light with a fixed frequency respectively, and inject them into the high-temperature optical cable through the first optical fiber and the second optical fiber respectively;

[0018] The emission interface of the pulsed laser is connected to the first optical switch, the emission interface of the continuous laser is connected to the second optical switch, and the first optical switch, the first optical fiber, the high-temperature optical cable, the second optical fiber and the second optical switch are connected in sequence; the optical frequency of the pulsed pump light is adjusted by the temperature measurement module to obtain an optical signal after the pulsed pump light and the continuous detection light are coupled, and the optical signal is transmitted to the temperature measurement module through the first optical fiber, and the temperature measurement module obtains the optical power of the pulsed pump light and the continuous detection light when the frequency difference between the pulsed pump light and the continuous detection light falls into the first preset frequency shift range through the optical signal, and obtains the frequency shift of the pulsed pump light and the continuous detection light through the optical power, and obtains the temperature information at each position on the high-temperature optical cable according to the frequency shift;

[0019] The industrial computer is connected to the DCS host and the SIS module; a relay is provided between the industrial computer and the SIS module; the industrial computer obtains the temperature value of the preset interval position point through the temperature information at each position on the high-temperature optical cable in the temperature measurement module, and when any point of the temperature value of the preset interval position point exceeds the preset temperature threshold or the temperature rise of the point exceeds the preset temperature rise threshold within the preset time, a switch signal is generated, and the switch signal is transmitted to the SIS module through the relay, and the SIS module generates an interlocking signal according to the switch signal to cut off the gasification furnace feed.

[0020] Furthermore, the monitoring device also includes a waterproof and explosion-proof connection box, and the connectors after the first optical fiber, the high-temperature optical cable, and the second optical fiber are connected in sequence are all stuck in the waterproof and explosion-proof connection box.

[0021] Furthermore, the industrial computer transmits control commands to the temperature measurement module through the RS232 serial port, and obtains temperature data of the temperature measurement module through the USB interface; the control commands include laser emission signals.

[0022] Furthermore, the monitoring device also includes a 485 module, the 485 module includes a 485 bus, and the specific connection method between the industrial computer and the DCS host is: the industrial computer is connected to the 485 module via an RS232 serial port, and the 485 module is connected to the DCS host via a 485 bus.

[0023] Furthermore, the high temperature optical cable is a high temperature resistant loose tube single mode optical fiber, which comprises a stainless steel tube, a steel wire and an optical fiber. The optical fiber is sheathed in the stainless steel tube, and the steel wire is sheathed outside the stainless steel tube.

[0024] Furthermore, the high temperature optical cable is laid on the wall surface of the gasifier in a preset manner, and the preset manner includes:

[0025] The high temperature optical cable is fixed on the wall surface of the gasifier in an S-shaped shape by a high temperature resistant strong magnet; and a high temperature resistant adhesive is applied on the fixed high temperature optical cable.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] (1) In the present invention, the temperature measurement module uses the laser emission signal transmitted by the industrial computer to make the pulse laser emission interface and the continuous laser emission interface emit pulse laser and continuous laser respectively, and inject them into the high-temperature optical cable through the first optical fiber and the second optical fiber respectively. Then, the optical frequency of the pulse pump light is adjusted by the temperature measurement module to obtain an optical signal after the pulse pump light and the continuous detection light are coupled, and the optical signal is transmitted to the temperature measurement module through the first optical fiber. The temperature measurement module obtains the optical power of the pulse pump light and the continuous detection light when the frequency difference between the pulse pump light and the continuous detection light falls into the first preset frequency shift range through the optical signal, and obtains the frequency shift of the pulse pump light and the continuous detection light through the optical power, and obtains the temperature on the high-temperature optical cable according to the frequency shift. Temperature information at each position; the industrial computer obtains the temperature value of the preset interval position point through the temperature information at each position on the high-temperature optical cable in the temperature measurement module, and generates a switch signal when any point of the temperature value of the preset interval position point exceeds the preset temperature threshold or the temperature rise of the point exceeds the preset temperature rise threshold within the preset time, and transmits the switch signal to the SIS module through the relay. The SIS module generates an interlocking signal according to the switch signal to cut off the gasifier feed, which solves the current technical problems that the thermocouple cannot cover the entire surface of the furnace wall and therefore cannot fully measure the furnace wall temperature, the cable temperature measurement cannot accurately locate, and the infrared thermal imager has high requirements for on-site installation, and there may be blind spots in monitoring the outer wall temperature of the gasifier;

[0028] (2) The present invention can continuously lay multiple turns of high-temperature optical cables on the surface of the gasifier as needed, and take the temperature values ​​of preset interval positions in the high-temperature optical cable laying line (the high-temperature optical cable has a low cost and is itself a temperature sensor. The denser the high-temperature optical cable is laid, the higher the temperature coverage rate and the smaller the measurement blind area), so as to solve the problem that the current thermocouple cannot cover the entire surface of the furnace wall and thus cannot fully measure the furnace wall temperature;

[0029] (3) The present invention fixes the high-temperature optical cable on the surface of the gasifier wall in an S-shaped manner by using a high-temperature resistant strong magnet and applies a high-temperature resistant adhesive on the fixed high-temperature optical cable, thereby solving the problem that the current cable temperature measurement cannot be accurately positioned;

[0030] (4) The present invention uses a relay set between the industrial computer and the SIS module. When any temperature value of the preset interval position point exceeds the preset temperature threshold or the temperature rise of the point exceeds the preset temperature rise threshold within a preset time, the industrial computer transmits a switch signal to the SIS module through the relay. The SIS module generates an interlocking signal according to the switch signal to cut off the gasifier feed, thereby realizing safe, timely and effective protection of the gasifier.

[0031] (5) The present invention effectively protects the safety of the optical fiber, the optical cable and the device by clamping the connector after the first optical fiber, the high-temperature optical cable and the second optical fiber are connected in sequence in a waterproof and explosion-proof connection box;

[0032] (6) The high temperature optical cable described in the present invention is a high temperature resistant loose tube single mode optical fiber, which comprises a stainless steel tube, a steel wire and an optical fiber. The optical fiber is sheathed in the stainless steel tube, and the steel wire is sheathed on the stainless steel tube. The material and composition structure of the optical cable greatly improve the high temperature resistance of the optical cable.

[0033] (7) The present invention monitors the temperature values ​​at each preset interval position point and the temperature rise value within a preset time. When the preset range or preset threshold is exceeded, an alarm message is issued in a timely manner and displayed through a DCS host, thereby greatly improving the safety of the gasifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A method flow chart of a method for monitoring the wall temperature of a gasifier wall;

[0035] Figure 2 The present invention is a structural diagram of a wall temperature monitoring device for a gasifier furnace wall;

[0036] Figure 3 This is a high temperature optical cable structure diagram for a wall temperature monitoring device for a gasifier furnace wall;

[0037] Figure 4 This is a diagram of the high-temperature optical cable installation for a gasifier furnace wall temperature monitoring device. DETAILED DESCRIPTION

[0038] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0039] Embodiment 1

[0040] In order to solve the technical problems that the thermocouple cannot cover the entire surface of the furnace wall and therefore cannot fully measure the furnace wall temperature, the cable temperature measurement cannot be accurately positioned, and the infrared thermal imager has high requirements for on-site installation, and there may be blind spots in monitoring the outer wall temperature of the gasifier, such as Figure 1 As shown, the present invention proposes a method for monitoring the wall temperature of a gasifier wall, comprising:

[0041] Acquire a laser emission signal; emit a variable frequency pulse pump light and a fixed frequency continuous detection light through the laser emission signal; and inject them into a high temperature optical cable laid on the wall of the gasifier through a first optical fiber and a second optical fiber respectively;

[0042] Adjust the optical frequency of the pulse pump light, and when the frequency difference between the pulse pump light and the continuous detection light falls into a first preset frequency shift range, obtain the optical power of the pulse pump light and the continuous detection light, and obtain the frequency shift of the pulse pump light and the continuous detection light through the optical power; obtain the temperature information at each position on the high-temperature optical cable according to the frequency shift;

[0043] It should be noted that the high temperature optical cable in the present invention is a loose tube optical fiber, and its stress will not change at high temperature and is only affected by temperature.

[0044] When the temperature value at any position on the high-temperature optical cable exceeds a preset temperature threshold or the temperature rise at that position exceeds a preset temperature rise threshold within a preset time, an interlock signal is generated;

[0045] The gasifier feed is stopped according to the interlock signal.

[0046] In this embodiment, when the temperature value at any position on the high-temperature optical cable is greater than 343°C or the temperature rise per minute is greater than 50°C, an interlock signal is generated, and an interlock action is performed through the interlock signal to directly cut off the gasifier feed.

[0047] The monitoring method also includes:

[0048] Obtaining temperature values ​​of preset interval positions through temperature information at various positions on the high-temperature optical cable;

[0049] Determine whether the temperature value of the preset interval position point is within the preset temperature range. If so, generate corresponding preset alarm information according to the temperature value, and issue an alarm through the preset alarm information.

[0050] Specifically, the preset temperature range includes: 290℃<temperature value≤320℃, 320℃<temperature value≤330℃. When the temperature value at any position on the high-temperature optical cable is within the above preset temperature range, a preset alarm message is generated according to the preset temperature range, and an alarm is given through the preset alarm message.

[0051] The monitoring method also includes:

[0052] When any of the temperature values ​​at the preset interval position points exceeds the preset temperature value, and the temperature rise within the preset time reaches any preset temperature rise value in the preset temperature rise value set, the corresponding preset alarm information is generated according to the preset temperature rise value, and an alarm is issued according to the preset alarm information.

[0053] In this embodiment, the preset temperature rise value set includes (30°C, 40°C, 50°C). When any temperature value of the preset interval position point is greater than 200°C, and the temperature rise reaches any preset temperature rise value in the preset temperature rise value set, the corresponding preset alarm information is generated according to the preset temperature rise value, and an alarm is issued according to the preset alarm information.

[0054] The monitoring method also includes:

[0055] The temperature values ​​of the previously preset positions are obtained in descending order through the temperature values ​​of the preset interval positions and displayed.

[0056] The present invention monitors the temperature values ​​at each preset interval position point and the temperature rise value within a preset time, and when the preset range or preset threshold is exceeded, an alarm message is promptly issued and displayed through a DCS host, thereby greatly improving the safety of the gasifier.

[0057] Embodiment 2

[0058] like Figure 2 As shown, a wall temperature monitoring device for a gasifier furnace wall includes: a high-temperature optical cable, a single-mode optical cable, a first optical switch, a second optical switch, a temperature measurement module, an industrial computer, a DCS host, a relay, and a SIS module;

[0059] The single-mode optical cable includes a first optical fiber and a second optical fiber, and the temperature measurement module includes a pulse laser emission interface and a continuous laser emission interface;

[0060] The high-temperature optical cable is laid on the surface of the furnace wall of the gasifier in a preset manner, and the industrial computer is connected to the temperature measurement module; the temperature measurement module uses the laser emission signal transmitted by the industrial computer to make the pulse laser emission interface and the continuous laser emission interface emit pulse pump light with a variable frequency and continuous detection light with a fixed frequency respectively, and inject them into the high-temperature optical cable through the first optical fiber and the second optical fiber respectively;

[0061] The emission interface of the pulsed laser is connected to the first optical switch, the emission interface of the continuous laser is connected to the second optical switch, and the first optical switch, the first optical fiber, the high-temperature optical cable, the second optical fiber and the second optical switch are connected in sequence; the optical frequency of the pulsed pump light is adjusted by the temperature measurement module to obtain an optical signal after the pulsed pump light and the continuous detection light are coupled, and the optical signal is transmitted to the temperature measurement module through the first optical fiber, and the temperature measurement module obtains the optical power of the pulsed pump light and the continuous detection light when the frequency difference between the pulsed pump light and the continuous detection light falls into the first preset frequency shift range through the optical signal, and obtains the frequency shift of the pulsed pump light and the continuous detection light through the optical power, and obtains the temperature information at each position on the high-temperature optical cable according to the frequency shift;

[0062] The industrial computer is connected to the DCS host and the SIS module; a relay is provided between the industrial computer and the SIS module; the industrial computer obtains the temperature value of the preset interval position point through the temperature information at each position on the high-temperature optical cable in the temperature measurement module, and when any point of the temperature value of the preset interval position point exceeds the preset temperature threshold or the temperature rise of the point exceeds the preset temperature rise threshold within the preset time, a switch signal is generated, and the switch signal is transmitted to the SIS module through the relay, and the SIS module generates an interlocking signal according to the switch signal to cut off the gasification furnace feed.

[0063] It should be noted that the present invention generates alarm information while cutting off the feed to the gasifier, and transmits the location point where the temperature exceeds the preset temperature threshold or the temperature rise exceeds the preset temperature rise threshold within the preset time and its temperature value and alarm information to the DCS host for display.

[0064] The present invention uses a relay set between the industrial computer and the SIS module. When the temperature value of any point at the preset interval position exceeds the preset temperature threshold or the temperature rise of the point exceeds the preset temperature rise threshold within the preset time, the industrial computer transmits a switch signal to the SIS module through the relay. The SIS module generates an interlocking signal according to the switch signal to cut off the feed to the gasifier, thereby realizing safe, timely and effective protection of the gasifier.

[0065] In addition, the present invention monitors the temperature values ​​at each preset interval position point and the temperature rise value within a preset time. When the preset range or preset threshold is exceeded, an alarm message is issued in time and displayed through the DCS host, which greatly improves the safety of the gasifier.

[0066] The monitoring device also includes a waterproof and explosion-proof splicing box, and connectors after the first optical fiber, the high-temperature optical cable, and the second optical fiber are sequentially connected are all stuck in the waterproof and explosion-proof splicing box.

[0067] The present invention effectively protects the safety of the optical fiber, the optical cable and the device by clamping the connector after the first optical fiber, the high-temperature optical cable and the second optical fiber are connected in sequence in a waterproof and explosion-proof connection box.

[0068] In this embodiment, Figure 2 As shown, the first optical fiber includes 4 optical fibers, which are respectively represented as A1, A2, A3, and A4; the second optical fiber includes 4 optical fibers, which are respectively represented as B1, B2, B3, and B4; therefore, the high-temperature optical cable also includes 4 fibers, which are respectively represented as S1, S2, S3, and S4; the A1, S1, and B1 are connected in sequence; the A2, S2, and B2 are connected in sequence; the A3, S3, and B3 are connected in sequence; the A4, S4, and B4 are connected in sequence; the connectors in the A1, S1, and B1 are stuck in the waterproof and explosion-proof box 1, the connectors in the A2, S2, and B2 are stuck in the waterproof and explosion-proof box 2, the connectors in the A3, S3, and B3 are stuck in the waterproof and explosion-proof box 3, and the connectors in the A4, S4, and B4 are stuck in the waterproof and explosion-proof box 4;

[0069] The first optical switch includes a common terminal A0, and the emission interface of the pulsed laser (represented by BA in this embodiment) is connected to the first optical switch through the common terminal A0; the second optical switch includes a common terminal B0, and the emission interface of the pulsed laser (represented by BB in this embodiment) is connected to the second optical switch through the common terminal B0.

[0070] It should be noted that the industrial computer is connected to the relay via the RS232 serial port, and the relay is connected to the SIS module via a 0.5 square cable.

[0071] The industrial computer transmits control commands to the temperature measurement module through the RS232 serial port, and obtains temperature data of the temperature measurement module through the USB interface; the control commands include laser emission signals.

[0072] The monitoring device also includes a 485 module, and the 485 module includes a 485 bus. The specific connection method between the industrial computer and the DCS host is: the industrial computer is connected to the 485 module via an RS232 serial port, and the 485 module is connected to the DCS host via a 485 bus.

[0073] like Figure 3 As shown, the high temperature optical cable is a high temperature resistant loose tube single mode optical fiber, which comprises a stainless steel tube, a steel wire and an optical fiber. The optical fiber is sheathed in the stainless steel tube, and the steel wire is sheathed outside the stainless steel tube.

[0074] The high temperature optical cable described in the present invention is a high temperature resistant loose tube single mode optical fiber, which comprises a stainless steel tube, a steel wire and an optical fiber. The optical fiber is sheathed in the stainless steel tube, and the steel wire is sheathed outside the stainless steel tube. Its material and composition structure greatly improve the high temperature resistance of the optical cable.

[0075] like Figure 4 As shown, the high temperature optical cable is laid on the wall surface of the gasifier in a preset manner, and the preset manner includes:

[0076] The high temperature optical cable is fixed on the wall surface of the gasifier in an S-shaped shape by a high temperature resistant strong magnet; and a high temperature resistant adhesive is applied on the fixed high temperature optical cable.

[0077] Figure 4 In the present invention, the left and right spacing of the high-temperature optical cables is 10 cm, the upper and lower spacing is 20 cm, and each row of high-temperature optical cables is 5 mm apart. In the present invention, the shape of the high-temperature optical cable laying, the upper and lower, left and right distances of the high-temperature optical cables, and the spacing distance between each row of high-temperature optical cables can be set according to actual conditions.

[0078] In addition, the present invention can continuously lay multiple turns of high-temperature optical cables on the surface of the gasifier as needed, and take the temperature values ​​of preset interval position points in the high-temperature optical cable laying line (high-temperature optical cables are relatively low in cost and are themselves temperature sensors. The denser the high-temperature optical cables are laid, the higher the temperature coverage rate and the smaller the measurement blind area), so as to solve the problem that the current thermocouples cannot cover the entire surface of the furnace wall and therefore cannot comprehensively measure the furnace wall temperature.

[0079] The invention fixes the high-temperature optical cable on the surface of the furnace wall of the gasifier in an S-shape by using a high-temperature resistant strong magnet and applies a high-temperature resistant adhesive on the fixed high-temperature optical cable, thereby solving the problem that the current cable temperature measurement cannot be accurately positioned.

[0080] In the present invention, the temperature measurement module uses the laser emission signal transmitted by the industrial computer to make the pulse laser emission interface and the continuous laser emission interface emit pulse laser and continuous laser respectively, and inject them into the high-temperature optical cable through the first optical fiber and the second optical fiber respectively, and then adjust the optical frequency of the pulse pump light through the temperature measurement module to obtain the optical signal after the pulse pump light and the continuous detection light are coupled, and the optical signal is transmitted to the temperature measurement module through the first optical fiber. The temperature measurement module obtains the optical power of the pulse pump light and the continuous detection light when the frequency difference between the pulse pump light and the continuous detection light falls into the first preset frequency shift range through the optical signal, and obtains the frequency shift of the pulse pump light and the continuous detection light through the optical power, and obtains the frequency of each position on the high-temperature optical cable according to the frequency shift. The industrial computer obtains the temperature value of the preset interval position point through the temperature information at each position on the high-temperature optical cable in the temperature measuring module, and generates a switch signal when any point of the temperature value of the preset interval position point exceeds the preset temperature threshold or the temperature rise of the point exceeds the preset temperature rise threshold within the preset time, and transmits the switch signal to the SIS module through the relay. The SIS module generates an interlocking signal according to the switch signal to cut off the gasifier feed, which solves the current technical problems that the thermocouple cannot cover the entire surface of the furnace wall and therefore cannot fully measure the furnace wall temperature, the cable temperature measurement cannot accurately locate, and the infrared thermal imager has high requirements for on-site installation, and there may be blind spots in monitoring the outer wall temperature of the gasifier.

[0081] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0082] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A method for monitoring the wall temperature of a gasifier furnace, characterized in that: Applied to a wall temperature monitoring device, which includes: a high temperature optical cable, a single-mode optical cable, a first optical switch, a second optical switch, a temperature measurement module, an industrial computer, a DCS host, a relay, and a SIS module; The single-mode optical cable includes a first optical fiber and a second optical fiber, and the temperature measurement module includes a pulse laser emission interface and a continuous laser emission interface; The high-temperature optical cable is laid on the surface of the furnace wall of the gasifier in a preset manner, and the industrial computer is connected to the temperature measurement module; the temperature measurement module uses the laser emission signal transmitted by the industrial computer to make the pulse laser emission interface and the continuous laser emission interface emit pulse pump light with a variable frequency and continuous detection light with a fixed frequency respectively, and inject them into the high-temperature optical cable through the first optical fiber and the second optical fiber respectively; The emission interface of the pulsed laser is connected to the first optical switch, the emission interface of the continuous laser is connected to the second optical switch, and the first optical switch, the first optical fiber, the high-temperature optical cable, the second optical fiber and the second optical switch are connected in sequence; the optical frequency of the pulsed pump light is adjusted by the temperature measurement module to obtain an optical signal after the pulsed pump light and the continuous detection light are coupled, and the optical signal is transmitted to the temperature measurement module through the first optical fiber, and the temperature measurement module obtains the optical power of the pulsed pump light and the continuous detection light when the frequency difference between the pulsed pump light and the continuous detection light falls into the first preset frequency shift range through the optical signal, and obtains the frequency shift of the pulsed pump light and the continuous detection light through the optical power, and obtains the temperature information at each position on the high-temperature optical cable according to the frequency shift; The industrial computer is connected to the DCS host and the SIS module; a relay is provided between the industrial computer and the SIS module; the industrial computer obtains the temperature value of the preset interval position point through the temperature information at each position on the high-temperature optical cable in the temperature measurement module, and generates a switch signal when any point of the temperature value of the preset interval position point exceeds the preset temperature threshold or the temperature rise of the point exceeds the preset temperature rise threshold within a preset time, and transmits the switch signal to the SIS module through the relay, and the SIS module generates an interlocking signal according to the switch signal to cut off the gasifier feed; The wall temperature monitoring method comprises: Acquire a laser emission signal; emit a variable frequency pulse pump light and a fixed frequency continuous detection light through the laser emission signal; and inject them into a high temperature optical cable laid on the wall of the gasifier through a first optical fiber and a second optical fiber respectively; Adjust the optical frequency of the pulse pump light, and when the frequency difference between the pulse pump light and the continuous detection light falls into a first preset frequency shift range, obtain the optical power of the pulse pump light and the continuous detection light, and obtain the frequency shift of the pulse pump light and the continuous detection light through the optical power; obtain the temperature information at each position on the high-temperature optical cable according to the frequency shift; When the temperature value at any position on the high-temperature optical cable exceeds a preset temperature threshold or the temperature rise at that position exceeds a preset temperature rise threshold within a preset time, an interlock signal is generated; The gasifier feed is stopped according to the interlock signal.

2. A method for monitoring the wall temperature of a gasifier according to claim 1, characterized in that: The monitoring method also includes: Obtaining temperature values ​​of preset interval positions through temperature information at various positions on the high-temperature optical cable; Determine whether the temperature value of the preset interval position point is within the preset temperature range. If so, generate corresponding preset alarm information according to the temperature value, and issue an alarm through the preset alarm information.

3. A method for monitoring the wall temperature of a gasifier according to claim 2, characterized in that: The monitoring method also includes: When any of the temperature values ​​at the preset interval position points exceeds the preset temperature value, and the temperature rise within the preset time reaches any preset temperature rise value in the preset temperature rise value set, the corresponding preset alarm information is generated according to the preset temperature rise value, and an alarm is issued according to the preset alarm information.

4. A method for monitoring the wall temperature of a gasifier according to claim 2, characterized in that: The monitoring method also includes: The temperature values ​​of the previously preset positions are obtained in descending order through the temperature values ​​of the preset interval positions and displayed.

5. The method for monitoring the wall temperature of a gasifier wall according to claim 1, characterized in that: The monitoring device also includes a waterproof and explosion-proof splicing box, and connectors after the first optical fiber, the high-temperature optical cable, and the second optical fiber are sequentially connected are all stuck in the waterproof and explosion-proof splicing box.

6. A method for monitoring the wall temperature of a gasifier according to claim 5, characterized in that: The industrial computer transmits control commands to the temperature measurement module through the RS232 serial port, and obtains temperature data of the temperature measurement module through the USB interface; the control commands include laser emission signals.

7. A method for monitoring the wall temperature of a gasifier according to claim 1, characterized in that: The monitoring device also includes a 485 module, and the 485 module includes a 485 bus. The specific connection method between the industrial computer and the DCS host is: the industrial computer is connected to the 485 module via an RS232 serial port, and the 485 module is connected to the DCS host via a 485 bus.

8. The method for monitoring the wall temperature of a gasifier wall according to claim 1, characterized in that: The high temperature optical cable is a high temperature resistant loose tube single mode optical fiber, which comprises a stainless steel tube, a steel wire and an optical fiber. The optical fiber is sheathed in the stainless steel tube, and the steel wire is sheathed outside the stainless steel tube.

9. A method for monitoring the wall temperature of a gasifier according to claim 1, characterized in that: The high temperature optical cable is laid on the wall surface of the gasifier in a preset manner, and the preset manner includes: The high temperature optical cable is fixed on the wall surface of the gasifier in an S-shaped shape by a high temperature resistant strong magnet; and a high temperature resistant adhesive is applied on the fixed high temperature optical cable.

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