Sludge incineration system and sludge incineration method

Abstract

The invention discloses a sludge incineration system and a sludge incineration method. The sludge incineration system comprises a wet sludge drying module, a wet sludge incineration module and an incinerator. The wet sludge drying module dries the wet sludge to be dried to obtain dry sludge, and collects fine powder generated in the process of drying the wet sludge by a fine powder collecting device. The collected fine powder is mixed with the wet sludge to be incinerated in the incineration wet sludge silo in a mixing and conveying device, and then sent to the incinerator for incineration through a first inlet on the incinerator. By mixing the fine powder generated in the drying process of the wet sludge to be dried with the wet sludge to be incinerated and then sending them to the incinerator for incineration, it is possible to prevent the occurrence of unstable combustion due to the small particles of the fine powder, explosion after entering the incinerator, and upward movement of the combustion area.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment and environmental protection, and in particular to a sludge incineration system and a sludge incineration method. Background Art

[0002] At present, the main methods for sludge disposal are landfill, agricultural composting and incineration. Sludge landfill wastes a lot of land resources, and the leachate in the transportation process and in the landfill is likely to cause secondary pollution to the environment; when sludge is composted or compound microbial fertilizer is made, heavy metals and harmful substances in the sludge cannot be effectively removed, and heavy metal ions are likely to accumulate in the soil and plants, which limits land use; sludge incineration can destroy organic matter, kill pathogens and minimize the volume of sludge, and the dried sludge is a low calorific value fuel, and the ash after incineration will not cause secondary pollution. Therefore, in the field of sludge disposal, sludge drying and incineration has a wide range of applications.

[0003] Fluidized bed dryer and incinerator are the core equipment for sludge drying and incineration. Fluidized bed dryer dries wet sludge with a moisture content of 80% to produce dry sludge with a moisture content of 10% or less, while incinerator is an environmental protection equipment that incinerates waste gas, waste liquid and solid waste at high temperature to achieve reduction, stabilization and harmlessness. Fluidized bed dryer uses heat source to exchange heat with sludge, removes moisture from wet sludge, and achieves the purpose of sludge drying. The dried sludge is sent to the incinerator for incineration. However, due to the violent internal flow state of fluidized bed dryer, the friction of sludge particles produces fine powder which is carried out by fluidized wind. The carrier gas recovers the fine powder through the fine powder separation device. Due to the small size of fine powder particles, it is very easy to explode and move the combustion area upward after entering the incinerator. Therefore, controlling the fine powder entering the incinerator is of great significance for the sludge combustion and flue gas emission control of the incinerator. At present, the dry sludge and fine powder of the fluidized bed dryer are mixed and injected into the furnace through the dry sludge feed injector. The fine powder in the dry sludge entering the incinerator causes the temperature of the incinerator to rise, and the incinerator may overheat, causing the coking and flue gas emission indicators (NOx and CO) to increase stepwise, and even have the risk of exceeding the standard. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a sludge incineration system and an incineration method.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A sludge incineration system, comprising:

[0007] A wet sludge drying module, the wet sludge drying module comprising a drying device and a fine powder collecting device, the drying device is used to dry the wet sludge to be dried to obtain dry sludge; the fine powder collecting device is used to collect fine powder generated during the drying process of the wet sludge;

[0008] A wet sludge incineration module, the wet sludge incineration module comprising a wet sludge incineration silo, a mixing and conveying device, and an incinerator, wherein the incinerator is provided with a first inlet connected to the mixing and conveying device;

[0009] The fine powder collected by the fine powder collecting device is mixed with the wet sludge to be incinerated in the incineration wet sludge silo in the mixing and conveying device, and enters the incinerator through the first inlet for incineration. In this technical solution, the wet sludge drying module dries the wet sludge to be dried to obtain dry sludge, and the fine powder generated in the wet sludge drying process is collected by the fine powder collecting device, and the collected fine powder is mixed with the wet sludge in the incineration wet sludge silo in the mixing and conveying device, and then sent to the incinerator through the first inlet on the incinerator for incineration. By mixing the fine powder generated in the wet sludge drying process with the wet sludge and then sending it to the incinerator for incineration, it is possible to prevent the fine powder particles from directly entering the incinerator and deflagration, and the combustion area from moving upward, resulting in unstable combustion.

[0010] Preferably, the fine powder collection device includes a carrier gas and fine powder separation device and a fine powder buffer bin, the drying device is provided with an air outlet at the top, the carrier gas and fine powder separation device is connected to the air outlet to separate the carrier gas and fine powder coming out of the drying device; the fine powder buffer bin is located downstream of the carrier gas and fine powder separation device to collect the separated fine powder; the fine powder buffer bin is provided with a material level detection device, the fine powder buffer bin is connected to a fine powder conveying device, and the fine powder conveying device conveys the fine powder to the mixing conveying device.

[0011] In the present technical solution, a carrier gas-fine powder separation device and a fine powder buffer bin are provided, the carrier gas and the fine powder are separated by the carrier gas-fine powder separation device, and the separated fine powder is collected in the fine powder buffer bin, and the storage amount of fine powder in the fine powder buffer bin is judged by the material level detection device, and the fine powder is transported to the mixing and conveying device by the fine powder conveying device.

[0012] Preferably, the sludge incineration system includes a carrier gas treatment device, the sludge incineration system includes a carrier gas treatment device, an air inlet is provided at the lower part of the drying device, one end of the carrier gas treatment device is connected to the carrier gas fine powder separation device, and the other end is connected to the air inlet.

[0013] In the present technical scheme, a carrier gas treatment device is provided to treat the carrier gas, and the treated carrier gas is sent to a drying device. Since the carrier gas has a relatively high temperature when it comes out of the drying device, the treated carrier gas is sent back to the drying device, which can recover part of the heat, realize the recycling of the carrier gas, and save energy. The carrier gas treated by the carrier gas treatment device enters the drying device through an air inlet provided at the lower part of the drying device, and the carrier gas flows from the lower part of the drying device to the upper part of the drying device, so that the recovered heat can be fully utilized.

[0014] Preferably, the wet sludge drying module also includes a drying wet sludge silo and a drying wet sludge conveying device, the drying wet sludge conveying device connects the drying wet sludge silo and the drying device, and the fine powder conveying device is a bidirectional screw conveyor, one end of the bidirectional screw conveyor is connected to the mixing conveying device, and the other end is connected to the drying wet sludge conveying device.

[0015] In the technical solution, the fine powder conveying device adopts a bidirectional screw conveyor, which can convey the fine powder to the mixing conveying device to mix with the wet sludge in the incineration wet sludge silo on the one hand, and can convey the fine powder to the drying wet sludge conveying device to mix with the drying wet sludge on the other hand. In particular, when the amount of fine powder in the subdivided buffer is large, according to the combustion situation, the operation mode of the bidirectional screw conveyor is controlled to convey a part of the fine powder to the drying wet sludge conveying device to mix with the drying wet sludge.

[0016] Preferably, the fine powder conveying device and the mixing conveying device are both frequency-adjustable conveying devices, and a sludge moisture content detector is provided at the outlet of the mixing conveying device. The fine powder conveying device and the mixing conveying device are adjusted respectively according to the measured value of the sludge moisture content detector, so as to achieve the adjustment of the mixing ratio of fine powder and wet sludge.

[0017] In the present technical solution, the fine powder conveying device and the mixing conveying device both adopt frequency-adjustable conveying devices. The supply amounts of fine powder and incineration wet sludge are adjusted respectively by adjusting the frequencies of the fine powder conveying device and the mixing conveying device. A sludge moisture content detector is provided at the outlet of the mixing conveying device to monitor the moisture content of the mixture of fine powder and wet sludge, so as to control the mixing ratio of fine powder and incineration wet sludge and thus control the moisture content of the mixture of fine powder and wet sludge, thereby ensuring the normal operation of the equipment.

[0018] Preferably, the sludge incineration system further comprises a dry sludge conveying device whose input end is connected to the drying device, and the incinerator is further provided with a second inlet, which is connected to the output end of the dry sludge conveying device for conveying dry sludge to the incinerator for incineration.

[0019] In the present technical solution, a dry sludge conveying device is provided, one end of which is connected to the drying device, and the other end is connected to the second inlet provided on the incinerator. The dry sludge conveying device conveys the dry sludge to the second inlet of the incinerator for incineration in the incinerator, that is, a mixture of fine powder and incineration wet sludge enters the incinerator through the first inlet, and the dry sludge enters the incinerator through the second inlet, which is convenient for adjusting and controlling according to the situation of the sludge, thereby making efficient use of the incinerator.

[0020] Preferably, a dry sludge silo is also connected between the dry sludge conveying device and the second inlet.

[0021] In this technical solution, a dry sludge silo is provided to store excess dry sludge, so that when the dry sludge output is large, the dry sludge that cannot be incinerated in the future can be stored; when the dry sludge output is low, it can be collected and stored for subsequent unified incineration treatment.

[0022] The present invention also provides a sludge incineration method, which adopts the above-mentioned sludge incineration system and comprises the following steps:

[0023] Step 1: storing the wet sludge in a drying wet sludge silo and an incineration wet sludge silo respectively;

[0024] Step 2: Drying the wet sludge to be dried by the wet sludge drying module to obtain dry sludge, and collecting the fine powder generated in the process of drying the wet sludge by the fine powder collecting device;

[0025] Step three: conveying the fine powder collected by the fine powder collecting device and the wet sludge in the incineration wet sludge silo to the mixing and conveying device for mixing, and conveying them to the incinerator through the first inlet on the incinerator for incineration.

[0026] In the present technical scheme, the wet sludge is stored in a drying wet sludge silo and an incineration wet sludge silo respectively, and the wet sludge is dried by a wet sludge drying module to obtain dry sludge, and the fine powder generated in the wet sludge drying process is collected by a fine powder collecting device, and the fine powder generated in the wet sludge drying process is mixed with the wet sludge and then sent to the incinerator for incineration. This can prevent the fine powder from directly entering the incinerator due to its small particles, causing explosion and upward movement of the combustion area, resulting in unstable combustion.

[0027] Preferably, the fine powder collection device includes a fine powder buffer bin, the fine powder buffer bin is connected to a fine powder conveying device, the fine powder conveying device conveys the fine powder to the mixing conveying device, the fine powder conveying device and the mixing conveying device are both frequency-adjustable conveying devices, and a sludge moisture content detector is provided at the outlet of the mixing conveying device; the step three also includes: comparing the measured value W1 of the sludge moisture content detector with the moisture content set value W0, when the measured value W1 of the sludge moisture content detector is greater than the set value W0, increasing the frequency of the fine powder conveying device or reducing the frequency of the mixing conveying device; when the measured value W1 of the sludge moisture content detector is less than the set value W0, reducing the frequency of the fine powder conveying device or increasing the frequency of the mixing conveying device.

[0028] Preferably, the sludge incineration system also includes a dry sludge conveying device whose input end is connected to the drying device, and the incinerator is also provided with a second inlet, which is connected to the output end of the dry sludge conveying device. Step two also includes using the dry sludge conveying device to convey the dry sludge to the incinerator through the second inlet for incineration.

[0029] The positive and progressive effect of the present invention is that the wet sludge drying module dries the wet sludge to be dried to obtain dry sludge, and collects the fine powder generated in the wet sludge drying process through the fine powder collecting device, mixes the collected fine powder with the wet sludge to be incinerated in the incineration wet sludge silo in the mixing and conveying device, and then sends the mixed powder to the incinerator through the first inlet on the incinerator for incineration. By mixing the fine powder generated in the wet sludge drying process with the wet sludge and then sending them to the incinerator for incineration, it is possible to prevent small particles of fine powder from directly entering the incinerator and then exploding, and the combustion area from moving upward to cause the incinerator to overheat, thereby causing the incinerator to coke and exceed the limit of flue gas emission indicators, thereby improving the stability of the incinerator operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of a sludge incineration system according to an embodiment of the present invention.

[0031] Figure 2 The figure is a schematic flow chart of a sludge incineration method according to an embodiment of the present invention.

[0032] Description of Reference Numerals

[0033] Drying wet sludge silo 1

[0034] Drying device 2

[0035] Drying wet sludge conveying device 3

[0036] Carrier gas fine powder separation device 4

[0037] Fine powder buffer 5

[0038] Fine powder conveying device 6

[0039] Incineration wet sludge silo 7

[0040] Mixing conveying device 8

[0041] Sludge moisture content detector 9

[0042] Incinerator 10

[0043] First Entrance 101

[0044] Second entrance 102

[0045] Dry sludge silo11

[0046] Dry sludge conveying device 12

[0047] Sludge pump 13

[0048] Dry sludge feed ejector 14

[0049] Isolation valve 15 DETAILED DESCRIPTION

[0050] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0051] See also Figure 1 Understand. An embodiment of the present invention provides a sludge incineration system, which includes a wet sludge drying module and a wet sludge incineration module; wherein the wet sludge drying module includes a drying device 2 and a fine powder collecting device, wherein the drying device 2 is used to dry the wet sludge to obtain dry sludge; the fine powder collecting device is used to collect fine powder generated during the drying of the wet sludge; the wet sludge incineration module includes a wet sludge incineration silo 7, a mixing and conveying device 8, and an incinerator 10, wherein a first inlet 101 is provided on the incinerator, and the first inlet 101 is connected to the mixing and conveying device 8; the fine powder collected in the fine powder collecting device is mixed with the wet sludge to be incinerated in the wet sludge incineration silo 7 in the mixing and conveying device, and enters the incinerator through the first inlet 101 for incineration.

[0052] The wet sludge to be dried is dried by the wet sludge drying module to obtain dry sludge, and the fine powder generated in the wet sludge drying process is collected by the fine powder collecting device, the collected fine powder is mixed with the wet sludge in the incineration wet sludge silo in the mixing and conveying device 8, and then sent to the incinerator for incineration through the first inlet on the incinerator 10. By mixing the fine powder generated in the wet sludge drying process with the wet sludge and then sending them to the incinerator for incineration, small particles of fine powder can be prevented from directly entering the incinerator and being easily stirred by the incineration flue gas, causing unstable combustion.

[0053] The drying device 2 is preferably a fluidized bed dryer. Of course, in other embodiments, other devices capable of drying sludge may also be selected.

[0054] The fine powder collecting device is connected to the drying device 2 and is used to collect the fine powder generated during the drying process of the wet sludge. The fine powder collecting device includes a carrier gas fine powder separation device 4 and a fine powder buffer bin 5. The upper part of the drying device 2 is provided with an air outlet. The carrier gas fine powder separation device 4 is connected to the air outlet to separate the carrier gas and fine powder from the air outlet of the drying device; the fine powder buffer bin 5 is located downstream of the carrier gas fine powder separation device 4 to collect the separated fine powder. The fine powder buffer bin is provided with a material level detection device ( Figure 1 The fine powder storage amount in the subdivided buffer bin is determined by a material level detection device; the fine powder buffer bin 5 is connected to a fine powder conveying device 6, which conveys the fine powder to a mixing conveying device 8.

[0055] The sludge incineration system also includes a carrier gas treatment device, a carrier gas treatment device ( Figure 1 The carrier gas treatment device (not shown) is arranged at the carrier gas outlet of the carrier gas fine powder separation device 4, and the lower part of the drying device 2 is provided with an air inlet. One end of the carrier gas treatment device is connected to the carrier gas outlet of the carrier gas fine powder separation device, and the other end is connected to the air inlet arranged at the lower part of the drying device 2. The carrier gas treatment device is provided to treat the carrier gas, and the treated carrier gas is sent to the drying device. Since the carrier gas comes out of the drying device 2 and the carrier gas temperature is relatively high, the treated carrier gas is sent back to the drying device 2 through the air inlet, which can recover this part of the heat, realize the recycling of the carrier gas, and save energy. In addition, the air inlet is provided at the lower part of the drying device 2, and the carrier gas will flow from the lower part of the drying device to the upper part of the drying device, so that the recovered heat can be fully utilized.

[0056] like Figure 1 As shown, the wet sludge drying module also includes a drying wet sludge silo 1 and a drying wet sludge conveying device 3. The drying wet sludge conveying device 3 is connected to the drying wet sludge silo 1 and the drying device 2. The wet sludge to be dried in the drying wet sludge silo 1 is conveyed to the drying device 2 for drying through the drying wet sludge conveying device 3. The fine powder conveying device 6 is a bidirectional screw conveyor. One end of the bidirectional screw conveyor is connected to the mixing conveying device 8, and the other end is connected to the drying wet sludge conveying device 12. On the one hand, the fine powder can be conveyed to the mixing conveying device 8 to mix with the wet sludge in the incineration wet sludge silo 7, and on the other hand, the fine powder can be conveyed to the drying wet sludge conveying device 3 to mix with the drying wet sludge. In particular, when the amount of fine powder in the subdivided buffer is large, the operation mode of the bidirectional screw conveyor is controlled according to the combustion situation. For example, when the amount of subdivided required by the mixing conveying device is small, a portion of the fine powder is conveyed to the drying wet sludge conveying device to mix with the drying wet sludge.

[0057] A fine powder isolation valve 15 is provided at the inlet of fine powder on the drying wet sludge conveying device 3 and the mixing conveying device 8. The fine powder isolation valve 15 is interlocked with the bidirectional screw conveyor to realize automatic control of the mixing of fine powder and wet sludge, and control the amount of fine powder entering the drying wet sludge conveying device 3 and the mixing conveying device 8 respectively.

[0058] In this embodiment, the fine powder conveying device 6 and the mixing conveying device 8 both adopt frequency-adjustable conveying devices. The frequency conversion control is realized by adopting a variable frequency motor. The frequency of the fine powder conveying device 6 and the mixing conveying device 8 is adjusted to adjust the supply amount of fine powder and incineration wet sludge. A sludge moisture content detector 9 is provided at the outlet of the mixing conveying device 8 to monitor the moisture content of the mixture of fine powder and wet sludge. The fine powder conveying device 6 and the mixing conveying device 8 are adjusted respectively according to the measured value of the sludge moisture content detector 9, so as to realize the adjustment of the mixing ratio of fine powder and wet sludge. The moisture content of the mixture of fine powder and wet sludge is controlled by controlling the supply amount of fine powder and incineration wet sludge, thereby ensuring the normal operation of the equipment. Specifically, the moisture content of the mixture of fine powder and wet sludge is set to W0. When the measured value W1 of the sludge moisture content detector 9 is greater than the set value W0, the frequency of the fine powder conveying device 6 is increased or the frequency of the mixing conveying device 8 is reduced, thereby increasing the supply of fine powder or reducing the supply of wet sludge; when the measured value W1 of the sludge moisture content detector 9 is less than the set value W0, the frequency of the fine powder conveying device 6 is reduced or the frequency of the mixing conveying device 8 is reduced, thereby reducing the supply of fine powder or increasing the supply of wet sludge. Figure 1 As shown, the incinerator 10 is provided with a first inlet 101 and a second inlet 102, wherein the first inlet 101 is connected to the mixing and conveying device 8, and the mixture of fine powder and incineration wet sludge in the mixing and conveying device 8 enters the incinerator 10 for incineration through the first inlet 101; the sludge incineration system also includes a dry sludge conveying device 12, the input end of the dry sludge conveying device 12 is connected to the drying device 2, and the output end of the dry sludge conveying device 12 is connected to the second inlet 102, which is used to convey the dry sludge into the incinerator 10 for incineration through the second inlet 102. That is, the mixture of fine powder and incineration wet sludge enters the incinerator through the first inlet 101, and the dry sludge enters the incinerator through the second inlet 102, which is convenient for regulating and controlling according to the conditions of the sludge, so as to make efficient use of the incinerator.

[0059] In the embodiment, a dry sludge silo 11 is also connected between the dry sludge conveying device 12 and the second inlet 102. The dry sludge silo 11 can store excess dry sludge, so that when the dry sludge output is large, the dry sludge that is not incinerated in the future can be stored. When the dry sludge output is low, it is collected and stored for subsequent unified incineration treatment. In this embodiment, the drying wet sludge conveying device 3 and the dry sludge conveying device 12 are spiral conveying devices, but other conveying devices can also be selected in other embodiments. In this embodiment, a wet sludge pump 13 is provided between the dry sludge conveying device 12 and the drying device 2 and between the mixing conveying device 8 and the first inlet 101, which is used to smoothly deliver the wet sludge pump 13 to the drying device 2 and the incinerator 10 respectively. A dry sludge feeding injector 14 is provided between the dry sludge silo and the second inlet 102, and the dry sludge feeding injector 14 is used to smoothly deliver the dry sludge to the incinerator 10.

[0060] Of course, in other embodiments, the fine powder can be transported by a combined closed conveying method, including a screw conveyor, a bucket elevator, a scraper conveyor, and a belt conveyor. The sludge incineration system can also include a nitrogen protection device to maintain airtightness and inert gas protection during the fine powder transportation process, avoid cooling and moisture during the sludge transportation process, and prevent potential sludge dust explosion risks.

[0061] like Figure 2 As shown, the embodiment of the present invention provides a sludge incineration method, which adopts Figure 1 The sludge incineration system comprises the following steps:

[0062] Step 1: Separate the wet sludge into wet sludge to be dried and wet sludge to be incinerated;

[0063] Step 2: Drying the wet sludge to be dried by the wet sludge drying module to obtain dry sludge, and collecting the fine powder generated in the process of drying the wet sludge by the fine powder collecting device;

[0064] Step three: the fine powder collected by the fine powder collecting device and the wet sludge in the incineration wet sludge silo 7 are transported to the mixing and transporting device 8 for mixing, and then transported to the incinerator 10 through the first inlet 101 on the incinerator 10 for incineration.

[0065] In this embodiment, wet sludge is divided into wet sludge to be dried and wet sludge to be incinerated; a drying wet sludge silo 1 is provided for holding wet sludge to be dried; and an incineration wet sludge silo 7 is provided for holding wet sludge to be incinerated, so as to facilitate the storage and use of wet sludge. The wet sludge to be dried is dried by a wet sludge drying module to obtain dry sludge, and the fine powder generated in the process of drying the wet sludge is collected by a fine powder collecting device, and the fine powder generated in the process of drying the wet sludge is mixed with the wet sludge and then sent to the incinerator 10 for incineration, which can prevent the fine powder from being easily stirred by the incineration flue gas after directly entering the incinerator 10, and prevent the fine powder from directly entering the incinerator 10 to cause the incinerator 10 to overheat and cause the incinerator 10 to coke and exceed the limit of flue gas emission indicators, thereby improving the stability of the operation of the incinerator 10.

[0066] In this embodiment, the fine powder collection device includes a fine powder buffer bin 5, which is connected to a fine powder conveying device 6. The fine powder conveying device 6 conveys the fine powder to the mixing conveying device 8. The fine powder conveying device 6 and the mixing conveying device 8 are both frequency-adjustable conveying devices, and a sludge moisture content detector 9 is provided at the outlet of the mixing conveying device 8; step three also includes: comparing the measured value W1 of the sludge moisture content detector 9 with the moisture content set value W0, when the measured value W1 of the sludge moisture content detector 9 is greater than the set value W0, increasing the frequency of the fine powder conveying device 6 or reducing the frequency of the mixing conveying device 8; when the measured value W1 of the sludge moisture content detector 9 is less than the set value W0, reducing the frequency of the fine powder conveying device 6 or increasing the frequency of the mixing conveying device 8.

[0067] In this embodiment, if Figure 1 As shown, the sludge incineration system also includes a dry sludge conveying device 12 whose input end is connected to the drying device 2, and the incinerator 10 is also provided with a second inlet, which is connected to the output end of the dry sludge conveying device 12, and step 2 also includes using the dry sludge conveying device 12 to deliver the dry sludge to the incinerator 10 through the second inlet for incineration. The mixture of fine powder and incineration wet sludge enters the incinerator 10 through the first inlet 101, and the dry sludge enters the incinerator 10 through the second inlet, so as to facilitate the regulation according to the condition of the sludge, so as to make efficient use of the incinerator 10.

[0068] In this embodiment, the sludge incineration system used includes a carrier gas processing device, wherein the fine powder collection device includes a carrier gas fine powder separation device 4 and a fine powder buffer bin 5, wherein the carrier gas fine powder separation device 4 is connected to the gas outlet to separate the carrier gas and fine powder from the drying device; the fine powder buffer bin 5 is located downstream of the carrier gas fine powder separation device 4 to collect the separated fine powder, and the fine powder buffer bin 5 is provided with a material level detection device ( Figure 1 The fine powder buffer 5 is connected to a fine powder conveying device 6, which conveys the fine powder to a mixing conveying device 8, and a carrier gas treatment device ( Figure 1(not shown) is arranged at the carrier gas outlet of the carrier gas fine powder separation device 4, and an air inlet is arranged at the lower part of the drying device 2. One end of the carrier gas treatment device is connected to the carrier gas outlet of the carrier gas fine powder separation device, and the other end is connected to the air inlet. At this time, step two can also include starting the carrier gas treatment device to treat the carrier gas, and then the treated carrier gas enters the drying device 2 through the air inlet arranged at the lower part of the drying device 2, so as to realize the recycling of the carrier gas, save energy, and improve the stability of the system through the carrier gas.

[0069] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A sludge incineration system, characterized in that: The sludge incineration system comprises: A wet sludge drying module, the wet sludge drying module comprising a drying device and a fine powder collecting device, the drying device is used to dry the wet sludge to be dried to obtain dry sludge; the fine powder collecting device is used to collect fine powder generated during the drying process of the wet sludge; A wet sludge incineration module, the wet sludge incineration module comprising a wet sludge incineration silo, a mixing and conveying device, and an incinerator, wherein the incinerator is provided with a first inlet connected to the mixing and conveying device; The fine powder collected by the fine powder collecting device is mixed with the wet sludge to be incinerated in the incineration wet sludge silo in the mixing and conveying device, and enters the incinerator through the first inlet for incineration; The fine powder collecting device comprises a carrier gas fine powder separation device and a fine powder buffer bin, the upper part of the drying device is provided with an air outlet, the carrier gas fine powder separation device is connected to the air outlet to separate the carrier gas and fine powder from the drying device; the fine powder buffer bin is located downstream of the carrier gas fine powder separation device to collect the separated fine powder; the fine powder buffer bin is provided with a material level detection device; the fine powder buffer bin is connected to a fine powder conveying device, and the fine powder conveying device conveys the fine powder to the mixing conveying device; The sludge incineration system comprises a carrier gas treatment device, an air inlet is arranged at the lower part of the drying device, one end of the carrier gas treatment device is connected to the carrier gas fine powder separation device, and the other end is connected to the air inlet; The wet sludge drying module further comprises a drying wet sludge silo and a drying wet sludge conveying device, wherein the drying wet sludge conveying device is connected to the drying wet sludge silo and the drying device, and the fine powder conveying device is a bidirectional screw conveyor, wherein one end of the bidirectional screw conveyor is connected to the mixing conveying device, and the other end is connected to the drying wet sludge conveying device; The fine powder conveying device and the mixing conveying device are both frequency-adjustable conveying devices. A sludge moisture content detector is provided at the outlet of the mixing conveying device. The mixing conveying device is configured to adjust the ratio of fine powder and wet sludge according to the measured value of the sludge moisture content detector.

2. The sludge incineration system according to claim 1, characterized in that: The sludge incineration system also includes a dry sludge conveying device whose input end is connected to the drying device. The incinerator is also provided with a second inlet, which is connected to the output end of the dry sludge conveying device for conveying dry sludge to the incinerator for incineration.

3. The sludge incineration system according to claim 2, characterized in that: A dry sludge silo is also connected between the dry sludge conveying device and the second inlet.

4. A sludge incineration method, characterized in that: The method adopts the sludge incineration system as claimed in any one of claims 1 to 3, and comprises the following steps: Step 1: Separate the wet sludge into wet sludge to be dried and wet sludge to be incinerated; Step 2: Drying the wet sludge to be dried by the wet sludge drying module to obtain dry sludge, and collecting the fine powder generated in the process of drying the wet sludge by the fine powder collecting device; Step three: conveying the fine powder collected by the fine powder collecting device and the wet sludge to be incinerated in the incineration wet sludge silo to the mixing and conveying device for mixing, and conveying the fine powder and the wet sludge in the incineration wet sludge silo to the incinerator for incineration.

5. The sludge incineration method according to claim 4, characterized in that: The fine powder collecting device comprises a fine powder buffer bin, the fine powder buffer bin is connected to a fine powder conveying device, the fine powder conveying device conveys the fine powder to the mixing conveying device, the fine powder conveying device and the mixing conveying device are both frequency-adjustable conveying devices, and a sludge moisture content detector is provided at the outlet of the mixing conveying device; The step three also includes: comparing the measured value W1 of the sludge moisture content detector with the moisture content set value W0, when the measured value W1 of the sludge moisture content detector is greater than the set value W0, increasing the frequency of the fine powder conveying device or reducing the frequency of the mixing conveying device; when the measured value W1 of the sludge moisture content detector is less than the set value W0, reducing the frequency of the fine powder conveying device or increasing the frequency of the mixing conveying device.

6. The sludge incineration method according to claim 4, characterized in that: The sludge incineration system also includes a dry sludge conveying device whose input end is connected to the drying device. The incinerator is also provided with a second inlet, which is connected to the output end of the dry sludge conveying device. Step 2 also includes using the dry sludge conveying device to convey the dry sludge to the incinerator through the second inlet for incineration.

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