Automatic compatibility feeding and feeding device and method for sludge

Abstract

A feeding hall is provided with a low-calorific-value material pit, a medium-calorific-value material pit and a high-calorific-value material pit which are used for storing incoming sludge with different combustion calorific values, and the feeding hall is provided with a travelling crane, a weighing device and a hydraulic grab bucket which are responsible for grabbing and transporting materials and carrying out accumulative calculation on the weight of the materials. The laser radar recognition device scans material distribution in the low-calorific-value material pit, the medium-calorific-value material pit and the high-calorific-value material pit and position information of the material receiving hopper, plans driving routes and lifting heights of the travelling crane and the hydraulic grab bucket and assists in compatibility of feeding and feeding operation, and the sludge receiving bin is located on a feeding platform and provided with a material mixing device, a conveying device and a weighing device. Sludge is automatically fed into the incinerator, and during operation, sludge in different heat value material pits is selected in an interlocking mode according to the temperature of the incinerator for compatibility and feeding. The automatic compatibility feeding and feeding method for the sludge has the advantages of being high in automation degree, capable of monitoring the process in real time, safe and stable.

Description

Technical Field

[0001] The invention relates to the technical field of environmental protection, and in particular to a sludge automatic mixing, feeding and feeding device and method. Background Art

[0002] As a kind of solid waste, the residual sludge and chemical sludge generated in the sewage treatment process are receiving more and more attention. If the sludge treatment does not meet the standards, the sewage treatment will not be thorough. The sludge generated by the sewage treatment plant can reduce the moisture content of the sludge from more than 98% to about 65% by using mechanical filter pressing technology, thus achieving sludge reduction. After filter pressing and dehydration, the sludge is solid and plate-like, and its own calorific value is equivalent to that of lignite, which can be completely treated by incineration.

[0003] The sludge disposal center uses incineration to treat sludge. Its incineration system needs to be equipped with a sludge storage, feeding and feeding system to ensure the continuous supply of sludge as fuel. Since the sludge of the sludge disposal center comes from multiple sewage treatment plants in the surrounding area, the moisture content and calorific value of the sludge fluctuate, which affects the stability of the incineration conditions. It is often the case that the furnace temperature is too high and water spraying is required to cool it down, and the furnace temperature is too low and auxiliary fuels such as natural gas or diesel are required to be added. Specifically:

[0004] (1) The sludge entering the plant fluctuates greatly and is directly received without classification. The impact of the sludge calorific value on incineration is not considered, which increases the difficulty of subsequent treatment and operating costs;

[0005] (2) The preparation and feeding of sludge into the factory depends on the operators, which is not automated, has low efficiency and high labor intensity, and the operation and running effect depends on the level of the workers. Summary of the invention

[0006] To solve the above problems, the purpose of the present invention is to provide a sludge automatic mixing and feeding device and method, which can realize the classified storage of sludge, perform mixing and feeding operations according to the operating temperature of the incinerator, and realize the linkage control of the entire device without human intervention.

[0007] The embodiment of the present invention provides a sludge automatic mixing and feeding device, the device comprising: a feeding hall, a low calorific value material pit, a medium calorific value material pit, a high calorific value material pit, a traveling crane, a hydraulic grab, a weighing device, a laser radar identification device, a feeding platform, a receiving hopper, a sludge receiving bin, a mixing device, a screw conveyor, a weighing module, a chute, a sludge feeder and an incinerator;

[0008] The lower part of the loading hall is equipped with a low calorific value pit, a medium calorific value pit and a high calorific value pit to store the incoming sludge with different combustion calorific values.

[0009] A traveling crane is installed on the upper part of the loading hall and connected with a hydraulic grab bucket, which can meet the needs of material grabbing, transportation and fixed-point feeding of low calorific value material pits, medium calorific value material pits and high calorific value material pits. The hydraulic grab bucket is equipped with a weighing device, which can weigh the sludge in the hydraulic grab bucket during the movement of the traveling crane.

[0010] A laser radar recognition device is installed on the top of the loading hall. By scanning the distribution information of materials in the low calorific value material pit, medium calorific value material pit and high calorific value material pit and the location information of the receiving hopper, it automatically analyzes, identifies and processes data information, plans the driving route and take-off and landing height of the crane and hydraulic grab, and assists the crane and hydraulic grab to complete automatic matching loading and feeding operations.

[0011] A feeding platform is arranged in the feeding hall, a sludge receiving bin is placed on the feeding platform, a mixing device is arranged on the sludge receiving bin body, the inlet of the sludge receiving bin is connected to the receiving hopper, a screw conveyor is arranged at the lower part of the sludge receiving bin, the outlet of the screw conveyor is connected to the inlet of the sludge feeder through a chute, and the outlet of the sludge feeder is connected to the inlet of the incinerator.

[0012] As a further improvement of the device of the present invention, the mixing device can run in forward and reverse directions and is provided with a first current detector. The first current detector can detect the working current of the mixing device when it is running.

[0013] As a further improvement of the device of the present invention, the screw conveyor is a double-axis screw and is provided with a second current detector, and the second current detector can detect the working current of the screw conveyor when it is running.

[0014] As a further improvement of the device of the present invention, the outlet of the sludge receiving bin is higher than the inlet of the incinerator, and the sludge in the sludge receiving bin enters the incinerator outside the loading hall through the screw feeder and the inclined discharge chute.

[0015] The embodiment of the present invention provides a method for automatic sludge mixing, loading and feeding, and the method comprises the following contents:

[0016] According to the calorific value of the incoming sludge, sludge with different combustion calorific values ​​are discharged into low calorific value pits, medium calorific value pits and high calorific value pits respectively. Among them, the sludge in the medium calorific value pit meets the fluctuation of the incinerator within the design temperature range during combustion. The sludge in the high calorific value pit will make the incinerator temperature higher than the upper limit of the design temperature during combustion. The sludge in the low calorific value pit will make the incinerator temperature lower than the lower limit of the design temperature during combustion.

[0017] When the incinerator is first loaded and operates stably within the design range, the sludge in the medium calorific value pit is selected for loading. When the operating temperature of the incinerator is low, the sludge in the high calorific value pit is selected for loading. When the operating temperature of the incinerator is high, the sludge in the low calorific value pit is selected for loading.

[0018] The laser radar recognition device conducts a comprehensive scan and recognition of the materials in the feeding platform and the material pit in real time, automatically analyzes, identifies, and processes data information, obtains the material distribution in the material pit and the location information of the feeding point, plans the driving route and take-off and landing height of the traveling crane and the hydraulic grab, and assists the traveling crane and the hydraulic grab to complete the positioning of the material pit and the grabbing point, and complete the automatic matching loading and feeding operations.

[0019] The crane and hydraulic grab bucket automatically travel along the planned route between grabbing and unloading. The weighing device is used to weigh and accumulate the materials during the material transportation process. After loading, the crane automatically travels to a fixed parking space.

[0020] The sludge receiving bin receives the sludge through the receiving hopper, mixes and breaks the sludge in the sludge receiving bin through the mixing device, and conveys the sludge to the chute through the screw conveyor at the bottom, and further enters the sludge feeder, and finally enters the incinerator for incineration.

[0021] The operating temperature of the incinerator corresponds to the calorific value type requirement of the fed sludge, and the material pit positioning operation of the crane and hydraulic grab is interlocked according to the feeding requirements of low calorific value sludge, medium calorific value sludge and high calorific value sludge.

[0022] As a further improvement of the method of the present invention, when the sludge in the medium calorific value pit is relatively small, a traveling crane and a hydraulic grab can be used to grab the high calorific value pit sludge and the low calorific value pit sludge in a certain proportion and bring them to the medium calorific value pit for mixing, so as to form sludge with a calorific value that meets the requirements of the medium calorific value pit as a reserve.

[0023] As a further improvement of the method of the present invention, the weighing module weighs the sludge receiving bin and its ancillary equipment in real time. When the material in the sludge receiving bin is too little and the weight is too low, the traveling crane will start the loading operation from the parking space until the weighing module value returns to the normal range, then stop loading and return to the parking space.

[0024] As a further improvement of the method of the present invention, the operating current of the screw conveyor is detected during operation. When the screw conveyor is idling due to sludge bridging, the detected current will be low. At this time, the mixing device is interlocked to assist the unloading of the sludge receiving bin.

[0025] After the mixing device is interlocked and started, the mixing forward operation is performed first, and its operating current is monitored in real time. If the mixing current is too large, the mixing reverse operation is started alternately until the mixing current is within the normal range.

[0026] As a further improvement of the method of the present invention, the entire process of mixing and feeding is automated, including an automatic mixing and feeding procedure and an automatic feeding procedure.

[0027] The automatic mixing and loading procedure includes the following contents:

[0028] Step 1: Set the lower weight limit W1 and the upper weight limit W2 of the sludge receiving bin;

[0029] Step 2: Determine whether the weight of the sludge receiving bin is less than W1. If so, proceed to the next step;

[0030] Step 3: Determine the furnace temperature caused by the change in furnace heat load.

[0031] If the furnace temperature is judged to be too low, the crane will be operated and positioned above the high calorific value material pit.

[0032] If the furnace temperature is judged to be normal, the crane will be operated and positioned above the medium calorific value material pit; if the furnace temperature is judged to be high, the crane will be operated and positioned above the low calorific value material pit;

[0033] Step 4: The hydraulic grab bucket descends, grabs the material, lifts it, and moves to the feeding point with the crane.

[0034] Synchronously, the weighing device weighs the materials in the grab bucket and makes cumulative calculations;

[0035] Step 5: The hydraulic grab bucket performs unloading operation above the receiving hopper;

[0036] Step 6: Determine whether the weight of the sludge receiving bin is greater than W2.

[0037] If the answer is no, go back to step 3 and continue the mixing and loading operation.

[0038] If the answer is yes, the crane and hydraulic grab bucket will move to the parking position and return to step 2 to wait for the next loading instruction.

[0039] The automatic feeding procedure includes the following contents:

[0040] Step 1: Set the lower limit C1 of the screw conveyor operating current, the upper limit C2 of the mixing device operating current, and the operating time T of the mixing device;

[0041] Step 2: Determine whether the screw conveyor, sludge feeder, and gate valve are in operation or open state.

[0042] If the judgment is yes, proceed to the next step.

[0043] If the judgment is no, an alarm will be given;

[0044] Step 3: Determine whether the operating current of the screw conveyor is less than C1. If so, proceed to the next step;

[0045] Step 4: The mixer runs forward;

[0046] Step 5: Determine whether the mixer operating current is less than C2.

[0047] If the answer is yes, the mixer will continue to run forward for T time, then stop running and return to step 3.

[0048] If the answer is no, an alarm is given and the mixer stops running after the mixer reverses for a duration of T, and the process returns to step 4.

[0049] The beneficial effects of the present invention are:

[0050] (1) Classify and store sludge according to its calorific value, and consider and utilize the impact of sludge calorific value on incineration to adjust the incineration conditions.

[0051] (2) The entire mixing and feeding operation is automated, with high operating efficiency, stable results and no dependence on the operator's ability level.

[0052] (3) The materials are mixed and fed according to the operating temperature of the incinerator. There is no need to spray water for cooling or add fuel to assist combustion, which reduces the cost of sludge incineration. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0054] Figure 1 This is a schematic diagram of the structure of a sludge automatic mixing, feeding and feeding device according to an embodiment of the present invention;

[0055] In the figure, 1. Loading hall; 2. Low calorific value material pit; 3. Medium calorific value material pit; 4. High calorific value material pit; 5. Driving crane; 6. Hydraulic grab; 7. Weighing device; 8. LiDAR identification device; 9. Feeding platform; 10. Sludge receiving bin; 11. Receiving hopper; 12. Mixing device; 13. Screw conveyor; 14. Weighing module; 15. Flexible connection; 16. Chute; 17. Gate valve; 18. Sludge feeder; 19. Incinerator; 20. Camera.

[0056] Figure 2 The present invention is a process flow chart of an automatic sludge mixing, feeding and feeding device and method according to an embodiment of the present invention.

[0057] Figure 3 The present invention provides a logic block diagram of a sludge automatic mixing and feeding program of a sludge automatic mixing and feeding method according to an embodiment of the present invention.

[0058] Figure 4 The present invention provides a logic block diagram of an automatic sludge feeding program of an automatic sludge mixing, loading and feeding method according to an embodiment of the present invention.

[0059] Figure 5 The present invention is a flowchart of the start-up sequence of an automatic sludge mixing, feeding and feeding device and method described in an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications 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.

[0062] In addition, in the description of the present invention, the terms used are only for illustrative purposes and are not intended to limit the scope of the present invention. The terms "include" and / or "comprise" are used to specify the existence of the elements, steps, operations and / or components, but do not exclude the existence or addition of one or more other elements, steps, operations and / or components. The terms "first", "second" and the like may be used to describe various elements, do not represent the order, and do not limit these elements. In addition, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is two and more than two. These terms are only used to distinguish one element from another element. In conjunction with the following drawings, these and / or other aspects become apparent, and it is easier for a person of ordinary skill in the art to understand the description of the embodiments of the present invention. The accompanying drawings are used to describe the embodiments of the present invention for illustrative purposes only. Those skilled in the art will easily recognize from the following description that, without departing from the principles of the present invention, alternative embodiments of the structures and methods shown in the present invention can be adopted.

[0063] The sludge automatic mixing and feeding device described in the embodiment of the present invention is as follows: Figure 1 As shown, one embodiment is:

[0064] The loading hall 1 is a closed building with a steel-concrete structure, in which three adjacent sludge pits are arranged, namely, a low calorific value pit 2 with a length of 12m*width of 8m*depth of 8m, a medium calorific value pit 3 with a length of 12m*width of 12m*depth of 8m and a high calorific value pit 4 with a length of 12m*width of 8m*depth of 8m. The pit bottom elevation is 0.0m. The low calorific value pit 2 is used to receive and store the low calorific value sludge entering the factory, the medium calorific value pit 3 is used to receive and store the medium calorific value sludge entering the factory, and the high calorific value pit 4 is used to receive and store the high calorific value sludge entering the factory.

[0065] A concrete feeding platform 9 is set on one side of the feeding hall 1, with an elevation of 10m. A volume of 25m is set above the feeding platform 9. 3 The sludge receiving bin 10 is provided with a receiving hopper 11 . The receiving hopper 11 is in the shape of an open funnel, and a bottom opening thereof is connected to a sludge inlet of the sludge receiving bin 10 .

[0066] The main body of the sludge receiving bin 10 is provided with two mixing devices 12, the mixing device 12 comprises a mixing / dispensing structure and a forward and reverse motor, the forward direction of the mixing device 12 is toward the central cross-section direction of the sludge receiving bin 10, and the reverse direction is away from the central cross-section direction of the sludge receiving bin 10, and the mixing device 12 is equipped with a first current detector to detect the operating current of the mixing motor.

[0067] The bottom of the sludge receiving bin 10 is connected to a screw conveyor 13, with a maximum conveying capacity of 12m 3 / h, the screw conveyor 13 is equipped with a variable frequency motor, and a second current detector is also configured to detect the operating current of the variable frequency motor.

[0068] The sludge receiving bin 10 is provided with a weighing module 14, which weighs the weight of the sludge receiving bin 10, the receiving hopper 11, the mixing device 12, the screw conveyor 13 and the weight of the sludge contained therein.

[0069] The screw conveyor 13 is arranged horizontally and its outlet is located outside the loading hall. The outlet of the screw conveyor 13 is connected to the soft connection 15 and the inlet of the slide pipe 16 in sequence. The slide pipe 16 is a 304 stainless steel pipe with a smooth inner wall and is arranged obliquely. The outlet of the slide pipe 16 is connected to the gate valve 17 and the inlet of the sludge feeder 18 in sequence.

[0070] The sludge feeder 18 adopts a double-shaft screw conveyor with a conveying capacity of 12m 3 / h, and is fixed to the side wall of the incinerator 19 and connected to the mud inlet of the incinerator 19. The mud inlet of the incinerator is 7.6m high.

[0071] An electric double-beam bridge crane 5 is arranged on the upper part of the loading hall 1. The horizontal movement track and lifting height of the crane 5 can cover the inner space of the loading hall 1. The crane 5 is equipped with a 12m 3The hydraulic grab 6 and the weighing device 7, and the laser radar recognition device 8 located on the top of the loading hall 1 comprehensively scan and identify the low calorific value material pit 2, the medium calorific value material pit 3, the high calorific value material pit 4 and the feeding platform 9, locate the material distribution in the discharge pit and the position and height of the feeding point, plan the driving route and take-off and landing height of the traveling crane 5 and the hydraulic grab 6, and assist in the loading and feeding operations.

[0072] The feeding hall 1 is also provided with a camera 20 for video monitoring of the mixing and feeding process.

[0073] The sludge automatic mixing and feeding device described in the embodiment of the present invention is as follows: Figure 1 and 2 As shown, one embodiment is:

[0074] The plate-and-frame sludge from the upstream sewage treatment plant is transported to the sludge treatment plant by sludge transport vehicles. The average moisture content of the sludge is 65%, and it is in the form of blocky solids. The sludge in the same transport vehicle comes from a sewage treatment plant, and its calorific value is uniform and stable. The calorific value of the sludge is tested before unloading.

[0075] The sludge treatment plant is equipped with a low calorific value pit 2, a medium calorific value pit 3 and a high calorific value pit 4. The sludge with a dry basis calorific value greater than 11.5 MJ / kg is unloaded into the high calorific value pit 4, the sludge with a dry basis calorific value between 9.5 MJ / kg and 11.5 MJ / kg is unloaded into the medium calorific value pit 3, and the sludge with a dry basis calorific value less than 9.5 MJ / kg is unloaded into the low calorific value pit 2.

[0076] When the incinerator 19 is in operation, the furnace design temperature must be maintained at 850°C to 870°C. Without adding combustion-supporting fuel (diesel or natural gas, etc.) and without adopting furnace cooling measures (emergency water spraying or reducing the sludge feed amount, etc.), the sludge in the medium calorific value pit 3 can enable the incinerator 19 to maintain stable operation at the design temperature.

[0077] The furnace temperature of the incinerator 19 is monitored dynamically in real time. When the furnace temperature fluctuates within the design temperature range of 850°C to 870°C, the interlocking program selects the sludge in the medium calorific value pit 3 to feed; when the furnace temperature is lower than 850°C, the interlocking program selects the sludge in the high calorific value pit 4 to feed; when the furnace temperature is higher than 870°C, the interlocking program selects the sludge in the low calorific value pit 2 to feed.

[0078] The detection range of the laser radar identification device 8 includes the feeding platform 9 and the low calorific value material pit 2, the medium calorific value material pit 3 and the high calorific value material pit 4 inside the loading hall 1. It performs comprehensive scanning and identification of the materials in the feeding platform 9 and the low calorific value material pit 2, the medium calorific value material pit 3 and the high calorific value material pit 4 in real time, obtains the material distribution in the low calorific value material pit 2, the medium calorific value material pit 3 and the high calorific value material pit 4 and the position information of the feeding point (receiving hopper 11), and then plans the driving route and take-off and landing height of the traveling crane 5 and the hydraulic grab 6.

[0079] According to the feeding requirements of low calorific value sludge, medium calorific value sludge and high calorific value sludge corresponding to the operating temperature of the incinerator 19, the material pit selection of the interlocking crane and the hydraulic grab bucket. The crane 5 and the hydraulic grab bucket 6 automatically travel along the planned route between grabbing and unloading, and automatically locate at the grabbing point and feeding point of the material pit. During the sludge transportation and movement process, the weighing device 7 weighs and accumulates the loaded sludge. After the loading is completed, the crane 5 automatically drives to a fixed parking space.

[0080] The sludge receiving bin 10 receives the plate and frame sludge discharged by the hydraulic grab bucket 6 through the receiving hopper 11 and stores it before feeding. If necessary, the sludge in the sludge receiving bin 10 is stirred and broken into pieces through the mixing device 12, and then the sludge is horizontally conveyed to the chute 16 through the screw conveyor 13 at the bottom. The sludge falls vertically and obliquely into the downstream sludge feeder 18 by its own gravity, and finally enters the incinerator 19 through the sludge feeder 18 for incineration.

[0081] A sludge automatic mixing and feeding device, an embodiment of which is:

[0082] During operation, the sludge in the medium calorific value pit 3 is mainly used as feed material. When the sludge in the medium calorific value pit 3 is too little, the crane 5 and the hydraulic grab 6 can be used to grab the sludge in a certain proportion from the high calorific value pit 4 and the sludge from the low calorific value pit 2 to the medium calorific value pit 3 for mixing, so as to form sludge with a calorific value that meets the requirements of the medium calorific value pit 3 as reserve.

[0083] A sludge automatic mixing and feeding device, an embodiment of which is:

[0084] The weighing module 14 weighs the sludge receiving bin 10 and its ancillary equipment in real time. When the material in the sludge receiving bin 10 is too little and the weight is too low, the crane 5 will start loading from the parking space until the value of the weighing module 14 returns to the normal range, then stop loading and return to the parking space.

[0085] The operating current of the screw conveyor 13 is detected when it is running. When the screw conveyor 13 is idling due to sludge bridging, the detected current will be low. At this time, the interlocking starts the mixing device 12 to assist the unloading of the sludge receiving bin 10.

[0086] After the mixing device 12 is interlocked and started, the mixing forward operation is first performed, and its operating current is monitored in real time. If the mixing current is too large, the mixing reverse operation is alternately started until the mixing current is within the normal range.

[0087] An embodiment of the present invention provides a method for automatically mixing and feeding sludge, wherein one embodiment is as follows:

[0088] The design heat load of a single incinerator is 9.8MW, and the sludge treatment capacity is 60t / h (on a pure dry basis). The incinerator is equipped with 4 sludge inlets, which are respectively connected to 4 sludge feeders, corresponding to 4 sets of sludge receiving bins 10 and their ancillary equipment.

[0089] Set up one low calorific value pit, one medium calorific value pit and one high calorific value pit. The effective volume of the medium calorific value pit is 640m 3 The effective volume of the high calorific value pit and the medium calorific value pit is 450m 3 . With the assistance of the laser radar recognition device, the crane and hydraulic grab bucket are used to load sludge of different calorific values. The crane and hydraulic grab bucket are fully automatic, and their control functions include giving the type of feed signal, selecting the grab point, selecting the feeding point, moving to the grab point, the grab bucket descending, the grab bucket state detection and deviation correction, grabbing materials, grab bucket grabbing and lifting, grab bucket lifting, moving to the feeding point, weighing and measuring, grab bucket opening and unloading, moving to the parking position, transporting and mixing materials, judging the material state, fault diagnosis and alarm, etc. The real-time data of the automatically operated crane and grab bucket will be transmitted to the remote monitoring personnel, and the monitoring personnel can also monitor the loading situation through the picture information sent back by the camera in the loading hall.

[0090] The remote monitoring personnel can understand the feeding situation in a certain period of time as follows:

[0091] Loading sequence Loading time Positioning grab point Material weight Cumulative feed amount The first time 08:00 Medium calorific value pit 8.6t 8.6t The second time 08:02 Medium calorific value pit 9.1t 17.7t The third time 08:29 Low calorific value pit 8.3t 26.0t The fourth time 08:31 Low calorific value pit 8.8t 34.8t The fifth time 09:01 Medium calorific value pit 8.9t 43.7t The 6th time 09:03 Medium calorific value pit 8.4t 52.1t

[0092] At the same time, the operating parameters of some equipment during this period are as follows:

[0093] Time Weight of sludge in the silo Mixing device Screw Conveyor Incinerator temperature 08:00 5.0t stop Frequency 40Hz 861℃ 08:10 11.5t Forward operation Frequency 40Hz 864℃ 08:20 9.3t stop Frequency 40Hz 867℃ 08:30 9.2t stop Frequency 40Hz 871℃ 08:40 10.1t stop Frequency 40Hz 859℃ 08:50 6.7t stop Frequency 40Hz 860℃ 09:00 4.9t stop Frequency 40Hz 861℃

[0094] The method for automatically mixing and feeding sludge according to the embodiment of the present invention is as follows: Figure 1 , 3 As shown in 4, an embodiment is:

[0095] According to the type of sludge feed to the incinerator, the selection of low calorific value, medium calorific value and high calorific value sludge is automatically completed, and the automatic matching and loading of materials is completed by using the crane, hydraulic grab and laser radar recognition device. The cumulative calculation of the fed sludge is completed by using the weighing device. The automatic feeding of the incinerator is completed by using the sludge receiving bin, mixing device (2 sets), screw conveyor, chute and sludge feeder. The matching and feeding process of sludge with different calorific values ​​is an automated operation, which mainly includes the "Automatic Matching and Loading Procedure" and the "Automatic Feeding Procedure".

[0096] The "Automatic Mixing and Loading Procedure" includes the following contents:

[0097] Step 1: Set the lower weight limit of the sludge receiving bin W1 = 5.0t (tare weight) and the upper weight limit of the sludge receiving bin W2 = 14.0t (tare weight);

[0098] Step 2: Determine whether the weight of the sludge receiving bin is less than 5.0t (W1). If so, proceed to the next step;

[0099] Step 3: Determine the furnace temperature caused by the change in furnace heat load.

[0100] If the furnace temperature is judged to be too low, such as furnace temperature < 850℃, the crane will be operated and positioned above the high calorific value material pit.

[0101] If the furnace temperature is judged to be normal, such as 850℃≤furnace temperature<870℃, the crane will be operated and positioned above the medium calorific value material pit.

[0102] If the furnace temperature is judged to be too high, such as the furnace temperature ≥870℃, the crane will be operated and positioned above the low calorific value material pit;

[0103] Step 4: The hydraulic grab bucket descends, grabs the material, lifts it, and moves to the feeding point with the crane.

[0104] At the same time, the weighing device weighs the material in the grab bucket to 9.8t and makes a cumulative calculation of the total amount of feed;

[0105] Step 5: The hydraulic grab bucket performs unloading operation above the receiving hopper;

[0106] Step 6: Determine whether the weight of the sludge receiving bin is greater than 14.0t (W2).

[0107] If the weight is judged to be ≤14.0t, return to step 3 and continue the mixing and loading operation.

[0108] If the weight is judged to be greater than 14.0t, the crane and the hydraulic grab bucket will move to the parking position and return to step 2 to wait for the next loading instruction.

[0109] The automatic feeding procedure includes the following contents:

[0110] Step 1: Set the lower limit of the screw conveyor operating current C1 = 12.0A (rated current is 22A), the upper limit of the mixing device operating current C2 = 8.5A (rated current 8.0A), and the mixing device operating time T = 1min;

[0111] Step 2: Determine whether the screw conveyor, sludge feeder, and gate valve are in operation or open. If yes, proceed to the next step.

[0112] If the judgment is no, an alarm will be given;

[0113] Step 3: Determine whether the operating current of the screw conveyor is less than its current lower limit 12.0A (C1). If the operating current is <12.0A, proceed to the next step;

[0114] Step 4: The mixer runs forward;

[0115] Step 5: Determine whether the mixer operating current is less than its upper current limit of 8.5A (C2).

[0116] If the running current is judged to be less than 8.5A, the mixer will stop running after running forward for 1 minute and return to step 3.

[0117] If the running current is judged to be ≥8.5A, an alarm will be given, and the mixer will reverse and run for 1 minute, then stop running and return to step 4.

[0118] The method for automatically mixing and feeding sludge according to the embodiment of the present invention is as follows: Figure 5 As shown, the startup sequence is as follows:

[0119] Step 1: The incinerator feeding instruction is issued;

[0120] Step 2: The crane is operated and positioned above the medium calorific value material pit;

[0121] Step 3: The hydraulic grab bucket descends, grabs the material, and lifts.

[0122] Step 4: The crane moves to the feeding point, and the weighing device weighs the sludge;

[0123] Step 5: The crane is positioned at the feeding point, and the hydraulic grab is opened to unload;

[0124] Step 6: Start the sludge feeder; at the same time, the crane and hydraulic grab bucket move to the parking space;

[0125] Step 7: Open the gate valve;

[0126] Step 8: Start the screw conveyor;

[0127] Step 9: The "Automatic Mixing and Loading Program" is put into operation;

[0128] Step 10: The "automatic feeding program" is put into operation.

[0129] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0130] In addition, it will be understood by those skilled in the art that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0131] It will be appreciated by those skilled in the art that, although the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for its elements without departing from the scope of the present invention. In addition, many modifications may be made to adapt specific circumstances or materials to the teachings of the present invention without departing from the essential scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but the present invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A sludge automatic mixing and feeding device, characterized in that: The device comprises: a feeding hall, a low calorific value material pit, a medium calorific value material pit, a high calorific value material pit, a traveling crane, a hydraulic grab bucket, a weighing device, a laser radar identification device, a feeding platform, a receiving hopper, a sludge receiving bin, a mixing device, a screw conveyor, a weighing module, a chute, a sludge feeder and an incinerator; The lower part of the loading hall is equipped with a low calorific value pit, a medium calorific value pit and a high calorific value pit to store the incoming sludge with different combustion calorific values. A traveling crane is installed on the upper part of the loading hall and connected to a hydraulic grab bucket to meet the needs of material grabbing, transportation and fixed-point feeding of low calorific value material pits, medium calorific value material pits and high calorific value material pits. The hydraulic grab bucket is equipped with a weighing device, which can weigh the sludge in the hydraulic grab bucket during the movement of the traveling crane. A laser radar recognition device is installed on the top of the loading hall. By scanning the distribution information of materials in the low calorific value material pit, medium calorific value material pit and high calorific value material pit and the location information of the receiving hopper, it automatically analyzes, identifies and processes data information, plans the driving route and take-off and landing height of the crane and hydraulic grab, and assists the automatic matching loading and feeding operations of the crane and hydraulic grab. A feeding platform is arranged in the feeding hall, a sludge receiving bin is placed on the feeding platform, a mixing device is arranged on the sludge receiving bin body, the inlet of the sludge receiving bin is connected to the receiving hopper, a screw conveyor is arranged at the lower part of the sludge receiving bin, the outlet of the screw conveyor is connected to the inlet of the sludge feeder through a chute, and the outlet of the sludge feeder is connected to the inlet of the incinerator.

2. A sludge automatic mixing and feeding device according to claim 1, characterized in that: The mixing device can run forward and reversely and is provided with a first current detector. The first current detector can detect the working current of the mixing device when it is running.

3. A sludge automatic mixing and feeding device according to claim 1, characterized in that: The screw conveyor is a double-shaft screw and is provided with a second current detector, and the second current detector can detect the working current of the screw conveyor when it is running.

4. The automatic sludge mixing and feeding device according to claim 1 is characterized in that: The outlet of the sludge receiving bin is higher than the inlet of the incinerator, and the sludge in the sludge receiving bin enters the incinerator outside the loading hall through a screw feeder and an inclined discharge chute.

5. A method for automatically mixing and feeding sludge, characterized in that: Contains the following: According to the calorific value of the incoming sludge, sludge with different combustion calorific values ​​are discharged into low calorific value pits, medium calorific value pits and high calorific value pits respectively. Among them, the sludge in the medium calorific value pit meets the fluctuation of the incinerator within the design temperature range during combustion. The sludge in the high calorific value pit will make the incinerator temperature higher than the upper limit of the design temperature during combustion. The sludge in the low calorific value pit will make the incinerator temperature lower than the lower limit of the design temperature during combustion. When the incinerator is first loaded and operates stably within the design range, the sludge in the medium calorific value pit is selected for loading. When the operating temperature of the incinerator is low, the sludge in the high calorific value pit is selected for loading. When the operating temperature of the incinerator is high, the sludge in the low calorific value pit is selected for loading. The laser radar recognition device conducts a comprehensive scan and recognition of the materials in the feeding platform and the material pit in real time, automatically analyzes, identifies, and processes data information, obtains the material distribution in the material pit and the location information of the feeding point, plans the driving route and take-off and landing height of the traveling crane and the hydraulic grab, and assists the traveling crane and the hydraulic grab to complete the positioning of the material pit and the grabbing point, and complete the automatic matching loading and feeding operations. The crane and hydraulic grab bucket automatically travel along the planned route between grabbing and unloading. The weighing device is used to weigh and accumulate the materials during the material transportation process. After loading, the crane automatically travels to a fixed parking space. The sludge receiving bin receives the sludge through the receiving hopper, mixes and breaks the sludge in the sludge receiving bin through the mixing device, and conveys the sludge to the chute through the screw conveyor at the bottom, and further enters the sludge feeder, and finally enters the incinerator for incineration. The operating temperature of the incinerator corresponds to the calorific value type requirement of the fed sludge, and the material pit positioning operation of the crane and hydraulic grab is interlocked according to the feeding requirements of low calorific value sludge, medium calorific value sludge and high calorific value sludge.

6. A method for automatically mixing and feeding sludge according to claim 5, characterized in that: When there is less sludge in the medium calorific value pit, the crane and hydraulic grab can be used to grab the high calorific value pit sludge and the low calorific value pit sludge in a certain proportion and mix them to the medium calorific value pit to form sludge with a calorific value that meets the requirements of the medium calorific value pit as reserve.

7. A method for automatically mixing and feeding sludge according to claim 5, characterized in that: The weighing module weighs the sludge receiving bin and its ancillary equipment in real time. When the material in the sludge receiving bin is too little and the weight is too low, the crane will start loading from the parking space and stop loading and return to the parking space after the weighing module value returns to the normal range.

8. A method for automatically mixing and feeding sludge according to claim 5, characterized in that: The operating current of the screw conveyor is detected during operation. When the screw conveyor is idling due to sludge bridging, the detected current will be low. At this time, the interlock starts the mixing device to assist the unloading of the sludge receiving bin. After the mixing device is interlocked and started, the mixing forward operation is performed first, and its operating current is monitored in real time. If the mixing current is too large, the mixing reverse operation is started alternately until the mixing current is within the normal range.

9. A method for automatically mixing and feeding sludge according to claim 5, characterized in that: The entire process of mixing and feeding is automated, including automatic mixing and feeding procedures. The automatic mixing and loading procedure includes the following: Step 1: Set the lower weight limit W1 and the upper weight limit W2 of the sludge receiving bin; Step 2: Determine whether the weight of the sludge receiving bin is less than W1. If so, proceed to the next step; Step 3: Determine the furnace temperature caused by the change in furnace heat load. If the furnace temperature is judged to be low, the crane will be operated and positioned above the high calorific value material pit; if the furnace temperature is judged to be normal, the crane will be operated and positioned above the medium calorific value material pit; if the furnace temperature is judged to be high, the crane will be operated and positioned above the low calorific value material pit; Step 4: The hydraulic grab bucket descends, grabs the material, lifts it, and moves to the feeding point along with the crane. Synchronously, the weighing device weighs the materials in the grab bucket and makes cumulative calculations; Step 5: The hydraulic grab bucket performs unloading operation above the receiving hopper; Step 6: Determine whether the weight of the sludge receiving bin is greater than W2. If the answer is no, go back to step 3 and continue the mixing and loading operation. If the answer is yes, the crane and hydraulic grab bucket will move to the parking position and return to step 2 to wait for the next loading instruction. The automatic feeding procedure includes the following: Step 1: Set the lower limit C1 of the screw conveyor operating current, the upper limit C2 of the mixing device operating current, and the operating time T of the mixing device; Step 2: Determine whether the screw conveyor, sludge feeder, and gate valve are in operation or open state. If the judgment is yes, proceed to the next step. If the judgment is no, an alarm will be given; Step 3: Determine whether the operating current of the screw conveyor is less than C1. If so, proceed to the next step; Step 4: The mixer runs forward; Step 5: Determine whether the mixer operating current is less than C2. If the answer is yes, the mixer will continue to run forward for T time, then stop running and return to step 3. If the answer is no, an alarm is given and the mixer stops running after the mixer reverses for a duration of T, and the process returns to step 4.

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