Coking apparatus and coking method

Abstract

The application provides a coking device and a coking method. The coking device comprises a lance system and a control system, and the control system is suitable for controlling the lance system; wherein the lance system comprises a lance, a conveying pump, a feed control valve, a feed pipeline and a fuel tank, the lance is suitable for being inserted into a flue through a coking hole on the flue, one end of the feed pipeline is connected to the fuel tank, the other end of the feed pipeline is close to the coking hole, and the conveying pump and the feed control valve are arranged on the feed pipeline; the control system comprises a differential pressure monitoring device, a temperature monitoring device and a control device, the differential pressure monitoring device and the temperature monitoring device are connected to the control device, and the control device is suitable for controlling the lance system.

Description

Technical Field

[0001] This invention relates primarily to the field of hazardous waste incineration equipment, and more particularly to a coking device and a coking method. Background Technology

[0002] During the operation of the secondary combustion chamber, the incinerator temperature must be ≥1100℃ when incinerating hazardous waste. At this high temperature, the materials melt. These molten mixtures have low melting points and produce suspended substances that enter the incineration system with the flue gas. After cooling, these substances adhere to the furnace walls, flue bends, boiler heat exchange tubes, and other locations, resulting in coking. With prolonged system operation, coking gradually accumulates, especially in the outlet flue of the secondary combustion chamber, where it is prone to adhesion and coking. If not addressed promptly, this can affect the incinerator's negative pressure, flue gas ventilation, and even pose a risk of large slag deposits, severely hindering the long-term stable operation of the incineration system.

[0003] Current technologies typically employ physical methods to remove coke buildup. However, this method requires stopping the incinerator and removing the coke by tapping. This cleaning method is quite forceful, and frequent cleaning can damage the furnace body and internal structure. Furthermore, the prolonged shutdown of the incinerator during cleaning reduces production efficiency and increases production costs. Currently, there is no online coke melting device using a coke-removing agent in the flue gas duct of the secondary combustion chamber of the incinerator. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an online coking device and coking method that does not require furnace shutdown and is easy to clean. The effect is more obvious when used in conjunction with a special coking agent during the implementation process.

[0005] To solve the above-mentioned technical problems, the present invention provides a coke melting device suitable for coke melting operations in the outlet flue of the secondary combustion chamber. The device is characterized in that it includes a spray gun system and a control system, the control system being adapted to control the spray gun system. The spray gun system includes a spray gun, a delivery pump, a feed control valve, a feed pipe, and a fuel tank. The spray gun is adapted to enter the flue through a coke melting hole in the flue. One end of the feed pipe is connected to the fuel tank, and the other end is close to the coke melting hole. The delivery pump and the feed control valve are mounted on the feed pipe. The control system includes a differential pressure monitoring device, a temperature monitoring device, and a control device. The differential pressure monitoring device and the temperature monitoring device are both connected to the control device, which is adapted to control the spray gun system.

[0006] In one embodiment of the present invention, the feed pipe includes a first pipe, a second pipe and a third pipe, and a delivery pump is disposed between the first pipe and the second pipe; wherein, the end of the first pipe away from the delivery pump is connected to the fuel tank; the end of the second pipe away from the delivery pump is close to the coke melting hole; the third pipe is a return pipe, and a feed control valve is disposed on the third pipe.

[0007] In one embodiment of the present invention, the spray gun includes a nozzle, a first rod, and a second rod; wherein the first rod is connected to a first end of the second rod and is perpendicular to the second rod; the nozzle is connected to a second end of the second rod and the nozzle is oriented in the same direction as the extension direction of the second rod.

[0008] In one embodiment of the present invention, one end of the first rod body connected to the second rod body is inserted into the flue through a coke melting hole, and at least a first length of the first rod body is located inside the flue.

[0009] In one embodiment of the present invention, the first length is 750 to 850 millimeters.

[0010] In one embodiment of the present invention, when the spray gun is inserted into the flue, the first rod is perpendicular to the extension direction of the flue.

[0011] In one embodiment of the present invention, the differential pressure monitoring device includes a first pressure gauge and a second pressure gauge; wherein, the first pressure gauge is located at the first end of the flue near the secondary combustion chamber and is suitable for measuring a first pressure value; the second pressure gauge is located at the second end of the flue away from the secondary combustion chamber and is suitable for measuring a second pressure value; when the difference between the first pressure value and the second pressure value is greater than a first threshold, the control device is suitable for activating an alarm mode.

[0012] In one embodiment of the present invention, when the difference between the first pressure value and the second pressure value is greater than the second threshold, the control device is adapted to control the spray gun system to start coking, and the second threshold is less than the first threshold.

[0013] In one embodiment of the present invention, the temperature monitoring device is located inside the flue. When the spray gun system begins to melt coke, the control device is also adapted to control the opening of the feed control valve according to the temperature measured by the temperature monitoring device.

[0014] In one embodiment of the present invention, the control device is configured to: increase the opening of the feed control valve when the temperature measured by the temperature monitoring device is less than a third threshold; and decrease the opening of the feed control valve when the temperature measured by the temperature monitoring device is greater than a fourth threshold; wherein the third threshold is less than the fourth threshold.

[0015] In one embodiment of the present invention, the spray gun system further includes a variable frequency induced draft fan, and when the spray gun system begins to melt coke, the control device is also adapted to control the operating frequency of the variable frequency induced draft fan according to a first pressure value.

[0016] The present invention also provides a coking method suitable for coking operations on the outlet flue of the secondary combustion chamber, characterized by comprising: determining whether the pressure difference between the top of the secondary combustion chamber and the top of the boiler compartment is greater than a first threshold, and if so, activating an alarm mode; determining whether the pressure difference between the top of the secondary combustion chamber and the top of the boiler compartment is greater than a second threshold, and if so, controlling the spray gun system to perform coking operations; determining whether the temperature in the flue is less than a third threshold, and if so, increasing the opening of the feed control valve; determining whether the temperature in the flue is greater than a fourth threshold, and if so, decreasing the opening of the feed control valve; controlling the operating frequency of the variable frequency induced draft fan to keep the pressure value at the end of the flue near the secondary combustion chamber within a stable pressure range; wherein, the first threshold is greater than the second threshold, and the third threshold is less than the fourth threshold.

[0017] In one embodiment of the present invention, the first threshold is 150-200 Pa, and the second threshold is 280-320 Pa.

[0018] In one embodiment of the present invention, the third threshold is 1200-1250°C, and the fourth threshold is 1250-1300°C.

[0019] In one embodiment of the present invention, the voltage regulation range is -30Pa to 10Pa.

[0020] Compared with the prior art, the coke melting device and method provided by the present invention have control devices installed in various parts of the secondary combustion chamber flue. By monitoring data such as temperature and pressure, the spray gun system is automatically controlled to carry out coke melting operation inside the flue. The coke can be cleaned without stopping the incinerator, which greatly reduces the cleaning difficulty and improves production efficiency. Attached Figure Description

[0021] The accompanying drawings are included to provide a further understanding of this application; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of this application and, together with this specification, serve to explain the principles of the invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of a coking device according to this application.

[0023] Figure 2 This is a partial schematic diagram of a coking device according to this application.

[0024] Figure 3 This is a schematic diagram of a spray gun structure according to this application.

[0025] Figure 4 This is a flowchart of a coking method according to this application. Detailed Implementation

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0027] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0029] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0032] Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, various steps can be processed in reverse order or simultaneously. Furthermore, other operations may be added to these processes, or one or more steps may be removed from these processes.

[0033] Figure 1 This is a schematic diagram of a coking apparatus according to this application. (Reference) Figure 1 As shown, the present invention provides a coking device 10 suitable for coking operations at the outlet flue 30 of the secondary combustion chamber 20. The coking device 10 includes a spray gun system 100 and a control system 200, and the control system 200 is adapted to control the spray gun system 100 to perform the coking operation. The spray gun system 100 includes a spray gun 110, a delivery pump 120a, a feed control valve 130, and a feed pipe 140, wherein the spray gun 110 is adapted to penetrate into the flue 30 through a coking hole 31 on the flue 30, thereby performing high-temperature coking. In a preferred embodiment of the present invention, the setting of the coking hole 31 needs to avoid the high-temperature flue gas turbulence zone at the top of the secondary combustion chamber, while facilitating coking by the spray gun flame.

[0034] Specifically, in this embodiment, the feed pipe 140 includes a first pipe 141, a second pipe 142, and a third pipe 143. A delivery pump 120a is located between the first pipe 141 and the second pipe 142. The end of the first pipe 141 furthest from the delivery pump 120a is connected to a fuel tank 150. The end of the second pipe 142 furthest from the delivery pump 120a is close to the coke melting hole 31 and the spray gun 110. The third pipe 143 is a return pipe. A feed control valve 130 is located on the third pipe 143. The control system 200 can control the fuel delivery by adjusting the opening of the feed control valve 130, thereby controlling the temperature of the coke melting operation within the flue 30.

[0035] like Figure 1-3 In a preferred embodiment, the spray gun system 100 further includes a feed shut-off valve 160 and a return valve 170a. The feed shut-off valve 160 is disposed on the second pipe 142, and the control system 200 can control whether fuel is supplied through the feed shut-off valve 160. The return valve 170a is mounted on the first pipe 141 and the second pipe 142 to ensure that the delivery pump 120a does not experience pressure buildup when the feed is cut off. Furthermore, this embodiment also includes another set of delivery pumps 120b and return valves 170b for standby. The delivery pump 120b is disposed between the first pipe 141 and the second pipe 142, and the return valve 170b is mounted on the first pipe 141 and the second pipe 142.

[0036] The control system 200 simultaneously controls the feed control valve 130 and the feed shut-off valve 160. By setting temperature process interlock logic, it controls the high-temperature molten fuel entering the outlet flue 30 of the secondary combustion chamber 20, achieving automatic interlocked temperature feeding and ensuring stable incinerator temperature. In some embodiments, the automatic control program is a DCS (Distributed Control System). When the temperature fluctuates, the DCS program controls the feed control valve 130 and the feed shut-off valve 160 to achieve temperature and feed interlock. Furthermore, in this embodiment, the fuel tank 150 is a biofuel tank; in other embodiments, it can also be set as a diesel fuel tank, etc. This application does not impose specific limitations, and operators can set it according to their needs.

[0037] Furthermore, in a preferred embodiment of this application, when performing coking operations at the outlet flue 30 of the secondary combustion chamber 20 using the coking melting device 10, a special decoking agent can be used. This special decoking agent is not placed in the spray gun system 100 of the coking melting device 10, but is instead introduced into the flue where coking operations are required when the furnace temperature reaches a certain threshold, working in conjunction with the coking melting device 10 to achieve a better coking effect. Specifically, the special decoking agent can be an online chemical decoking agent based on hazardous waste incineration coking, as described in patent publication CN108192685A. This agent can diffuse to all corners of the flue 30, increasing the coking range, while simultaneously converting the coke into a weakly alkaline substance, lowering its melting point, thereby reducing the difficulty of the coking operation and providing a certain degree of protection for the flue 30. It is understood that in some other embodiments of the present invention, the coking device 10 may also include a structure for containing the special decoking agent.

[0038] Figure 2 This is a partial schematic diagram of a coke melting device according to this application. Figure 3 This is a schematic diagram of a spray gun structure according to this application. (Refer to the reference.) Figure 1-3 As shown, in this embodiment, the spray gun 110 includes a first rod 111, a second rod 112, and a nozzle 113. The first end of the second rod 112 (e.g., Figure 3 The upper end shown is connected to the first rod 111, and the second rod 112 is perpendicular to the first rod 111. The end of the first rod 111 away from the second rod 112 (as shown) Figure 3 The right end (as shown) is connected to the feed pipe 140. The nozzle 113 is connected to the second end of the second rod 112 (as shown). Figure 3 (as shown at the lower end), and the nozzle 113 is oriented in the same direction as the extension of the second rod 112.

[0039] Specifically, in this embodiment, one end of the first rod 111 connected to the second rod 112 is adapted to be inserted into the flue 30 through the coking hole 31. It can be understood that at this time, both the second rod 112 and the nozzle 113 are located inside the flue 30. The spray gun 110 is equipped with cooling air and atomizing air, and the nozzle 113 is adapted to ignite the fuel output from the feed pipe 140 under the action of both, thereby achieving the purpose of coking. In a preferred embodiment of the present invention, the atomized particles of the atomizing air equipped in the spray gun 110 have a diameter of less than 60 micrometers.

[0040] In this embodiment, when the spray gun 110 enters the flue 30, the first rod 111 is perpendicular to the extending direction of the flue 30, and at least a first length L1 is located within the flue 30, the first length L1 being 750–850 mm. Figure 1-3In the preferred embodiment shown, the first length L1 is 800 mm, meaning the depth to which the first rod 111 penetrates the flue 30 is 800 mm. It should be noted that the first length L1 is not necessarily equal to the length of the first rod 111; the length of the first rod 111 can be equal to or greater than the first length L1, and the operator can set it according to requirements.

[0041] In a preferred embodiment of this application, the scattering angle α of the flame emitted by the nozzle 113 is 60–70°. Figure 1-3 In the embodiment shown, the angle is 65°, and the flame has a second length L2, which is 600–800 mm. Figure 1-3 In the embodiment shown, the nozzle diameter is 700 mm, and the angle β between the nozzle 113's orientation and the horizontal direction is 52–60°. Figure 1-3 In the illustrated embodiment, the angle is 56°.

[0042] Furthermore, the control system 200 includes a differential pressure monitoring device 210, a temperature monitoring device 220, and a control device 230. Both the differential pressure monitoring device 210 and the temperature monitoring device 220 are connected to the control device 230, which is adapted to control the spray gun system 100. Specifically, the differential pressure monitoring device 210 includes a first pressure gauge 211 and a second pressure gauge 212. The first pressure gauge 211 is located at the top of the secondary combustion chamber 20 and is adapted to measure a first pressure value there. The second pressure gauge 212 is located at the top of the boiler compartment 40 and is adapted to measure a second pressure value there. When the difference between the first and second pressure values ​​is greater than a first threshold, the control device 230 is adapted to activate an alarm device. When the difference between the first and second pressure values ​​is not greater than the first threshold but is greater than the second threshold, the control device 230 is adapted to control the spray gun system 100 to begin coking.

[0043] It is understandable that the difference between the first pressure value and the second pressure value is approximately the pressure difference between the two ends of the flue 30. The second threshold is the normal pressure difference inside the flue 30. When the difference between the first pressure value and the second pressure value is greater than the second threshold, it can be considered that coking has occurred inside and a coking melting operation is required. When the difference between the two is greater than the first threshold, there may be a safety hazard. In this case, an alarm should be sounded in time and the coking melting operation should not be initiated.

[0044] The temperature monitoring device 220 is located inside the flue 30. When the spray gun system 100 begins to melt coke, the control device 230 is adapted to control the opening of the feed control valve 130 according to the temperature measured by the temperature monitoring device 220. Furthermore, when the spray gun system 100 includes a feed shut-off valve 160, the control device 230 is also adapted to control the opening and closing of the feed shut-off valve 160 according to the temperature measured by the temperature monitoring device 220.

[0045] Furthermore, the control device 230 is configured to: increase the opening of the feed control valve 130 when the temperature measured by the temperature monitoring device 220 is less than the third threshold; and decrease the opening of the feed control valve 130 when the temperature measured by the temperature monitoring device 220 is greater than the fourth threshold, provided that the third threshold is less than the fourth threshold. Specifically, the temperature monitoring device 220 is suitable for detecting the temperature inside the flue 30. The third threshold is the lower limit of the normal coking operation temperature inside the flue 30, and the fourth threshold is the upper limit of the normal coking operation temperature inside the flue 30. When the temperature inside the flue 30 is less than the third threshold, it means that the coke is not burning completely during the coking process, and the fuel input needs to be increased to make the combustion more complete. When the temperature inside the flue 30 is greater than the fourth threshold, it means that there may be over-combustion inside, which poses a certain safety risk, and the fuel input needs to be reduced to lower the temperature.

[0046] In a preferred embodiment of the present invention, when the coking device 10 further includes a structure for containing a special coking agent, the control system 200 is also adapted to control the dispensing of the special coking agent according to the temperature measured by the temperature monitoring device 220, thereby further automating the coking operation.

[0047] Furthermore, in this embodiment, the spray gun system 100 also includes a variable frequency induced draft fan 240. When the spray gun system 100 begins to melt coke, the control device 230 is also adapted to control the operating frequency of the variable frequency induced draft fan according to the first pressure value measured by the first pressure gauge 211.

[0048] Figure 4 This is a flowchart of a coking method according to this application. (Refer to the reference.) Figure 1-4 As shown, the present invention also provides a coke melting method suitable for performing coke melting operations on the outlet flue of the secondary combustion chamber, specifically including the following steps:

[0049] S1: Determine whether the pressure difference between the top of the secondary combustion chamber and the top of the boiler compartment is greater than the first threshold. If so, activate the alarm mode.

[0050] S2: Determine whether the pressure difference between the top of the secondary combustion chamber and the top of the boiler compartment is greater than the second threshold. If so, control the spray gun system to perform coke melting operation.

[0051] S3: Determine if the temperature inside the flue is less than the third threshold. If so, increase the opening of the feed control valve.

[0052] S4: Determine if the temperature inside the flue is greater than the fourth threshold. If so, reduce the opening of the feed control valve.

[0053] S5: Control the operating frequency of the variable frequency induced draft fan to keep the pressure at the end of the flue near the secondary combustion chamber within a stable range.

[0054] Specifically, steps S1 and S2 both assess the pressure difference between the top of the secondary combustion chamber 20 and the top of the boiler chamber 40. As mentioned earlier, when the pressure difference between these two points exceeds the second threshold, it is considered that coking has occurred inside the flue 30, requiring coking melting. However, when the pressure difference exceeds the first threshold, there may be a safety hazard. Understandably, determining the existence of a safety hazard has higher priority. Therefore, the pressure difference between the top of the secondary combustion chamber 20 and the top of the boiler chamber 40 is first compared with the first threshold to confirm whether an alarm needs to be triggered. Only if safety is confirmed will step S2 be executed to determine whether coking melting is necessary, provided the first threshold is greater than the second threshold. When the results of steps S1 and S2 are both negative, meaning the pressure difference between the top of the secondary combustion chamber 20 and the top of the boiler chamber 40 is less than the first threshold, it is considered that no coking has occurred inside the flue 30, and coking melting is unnecessary; therefore, subsequent steps are not executed. In a preferred embodiment of the present invention, the first threshold is 150–200 Pa, and the second threshold is 280–320 Pa.

[0055] When the pressure difference between the top of the secondary combustion chamber 20 and the top of the boiler compartment 40 is greater than the second threshold but not greater than the first threshold, the control spray gun system 100 melts the coke inside the flue 30 and executes subsequent steps. In steps S3 and S4, the opening of the feed control valve 130 is adjusted according to the temperature inside the flue 30. When the temperature inside the flue 30 is less than the third threshold, the coke is not fully burned, and the fuel input needs to be increased to make the combustion more complete. When the temperature inside the flue 30 is greater than the fourth threshold, the inside may have been overburned, and the fuel input needs to be reduced to lower the temperature, and the third threshold is less than the fourth threshold. In a preferred embodiment of the present invention, the third threshold is 1200-1250°C, and the fourth threshold is 1250-1300°C. When the temperature inside the flue 30 is between the third and fourth thresholds, there is no need to adjust the feed control valve 130.

[0056] In step S5, in a preferred embodiment, the voltage regulation range is -30Pa to 10Pa.

[0057] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0058] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0059] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0060] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0061] Although this application has been described with reference to specific embodiments, those skilled in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, any changes or modifications to the above embodiments within the essential spirit of this application will fall within the scope of the claims of this application.

Claims

1. A coke melting device, suitable for coke melting operation in the outlet flue of the secondary combustion chamber, characterized in that, The coke melting device includes a spray gun system and a control system, wherein the control system is adapted to control the spray gun system; wherein... The spray gun system includes a spray gun, a delivery pump, a feed control valve, a feed pipe, and a fuel tank. The spray gun is adapted to enter the flue through a coke melting hole on the flue. One end of the feed pipe is connected to the fuel tank, and the other end is close to the coke melting hole. The delivery pump and the feed control valve are installed on the feed pipe. The control system includes a differential pressure monitoring device, a temperature monitoring device, and a control device. The differential pressure monitoring device and the temperature monitoring device are both connected to the control device, and the control device is adapted to control the spray gun system. The differential pressure monitoring device includes a first pressure gauge and a second pressure gauge; the first pressure gauge is located at the top of the secondary combustion chamber and is suitable for measuring a first pressure value; the second pressure gauge is located at the top of the boiler compartment and is suitable for measuring a second pressure value; when the difference between the first pressure value and the second pressure value is greater than a first threshold, the control device is suitable for activating an alarm mode. The temperature monitoring device is located inside the flue. When the spray gun system begins to melt coke, the control device is also adapted to control the opening of the feed control valve based on the temperature measured by the temperature monitoring device.

2. The coking apparatus as described in claim 1, characterized in that, The feed pipe includes a first pipe, a second pipe, and a third pipe, and the delivery pump is disposed between the first pipe and the second pipe; wherein... The end of the first pipeline furthest from the delivery pump is connected to the fuel tank; The end of the second pipe furthest from the delivery pump is close to the coke hole; The third pipe is a return pipe, and the feed control valve is installed on the third pipe.

3. The coking apparatus as described in claim 1, characterized in that, The spray gun includes a nozzle, a first rod, and a second rod; wherein... The first rod is connected to the first end of the second rod, and the first rod is perpendicular to the second rod; The nozzle is connected to the second end of the second rod, and the nozzle is oriented in the same direction as the extension of the second rod.

4. The coking apparatus as described in claim 3, characterized in that, One end of the first rod connecting to the second rod extends into the flue through the char-melting hole, and at least a first length of the first rod is located within the flue.

5. The coking apparatus as described in claim 4, characterized in that, The first length is 750-850 mm.

6. The coking apparatus as described in claim 4, characterized in that, When the spray gun is inserted into the flue, the first rod is perpendicular to the extension direction of the flue.

7. The coking apparatus as described in claim 1, characterized in that, When the difference between the first pressure value and the second pressure value is greater than the second threshold, the control device is adapted to control the spray gun system to start coking, and the second threshold is less than the first threshold.

8. The coking apparatus as described in claim 1, characterized in that, The control device is configured as follows: When the temperature measured by the temperature monitoring device is less than the third threshold, the opening of the feed control valve is increased; When the temperature measured by the temperature monitoring device is greater than the fourth threshold, the opening of the feed control valve is reduced; wherein, The third threshold is less than the fourth threshold.

9. The coking apparatus as claimed in claim 1, characterized in that, The spray gun system also includes a variable frequency induced draft fan. When the spray gun system begins to melt coke, the control device is also adapted to control the operating frequency of the variable frequency induced draft fan according to the first pressure value.

10. A coke melting method, applied to the coke melting apparatus as described in claim 1, suitable for performing coke melting operations on the outlet flue of the secondary combustion chamber, characterized in that, include: Determine whether the pressure difference between the top of the secondary combustion chamber and the top of the boiler compartment is greater than the first threshold; if so, activate the alarm mode. Determine whether the pressure difference between the top of the secondary combustion chamber and the top of the boiler compartment is greater than the second threshold. If so, control the spray gun system to perform coke melting operation. Determine whether the temperature inside the flue is less than the third threshold; if so, increase the opening of the feed control valve. Determine whether the temperature inside the flue is greater than the fourth threshold; if so, reduce the opening of the feed control valve. The operating frequency of the variable frequency induced draft fan is controlled to keep the pressure at the end of the flue near the secondary combustion chamber within a stable range; wherein, The first threshold is greater than the second threshold, and the third threshold is less than the fourth threshold.

11. The coking method as described in claim 10, characterized in that, The first threshold is 150-200 Pa, and the second threshold is 280-320 Pa.

12. The coking method as described in claim 10, characterized in that, The third threshold is 1200-1250℃, and the fourth threshold is 1250-1300℃.

13. The coking method as described in claim 10, characterized in that, The voltage regulation range is -30Pa to 10Pa.

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