CN112645558B - Sludge drying system and sludge drying treatment process - Google Patents

Abstract

The invention discloses a sludge drying system and a sludge drying treatment process. The sludge drying system comprises a sludge bin; the extruding machine comprises a first shell and an extruding roller group arranged in a first cavity of the first shell, a first heat source inlet is formed in the first shell, the first cavity is communicated with a discharge hole of the sludge bin, the extruding roller group comprises a plurality of extruding rollers which are arranged along a first horizontal direction, two adjacent extruding rollers of the extruding roller group are matched, at least one part of the extruding rollers is rotatably arranged, and a plurality of accommodating grooves are formed in the outer peripheral surface of at least one part of the extruding rollers; and the dryer comprises a second shell and a first heating plate arranged in a second cavity of the second shell, and the second cavity is communicated with the first cavity. The sludge drying system provided by the embodiment of the invention has the advantages of no dust generation, no environmental pollution, simple treatment process, low equipment investment, low operation cost and the like.

Description

Sludge drying system and sludge drying treatment process

Technical Field

The invention relates to the field of sludge treatment, in particular to a sludge drying system and a sludge drying treatment process.

Background

Wastewater treatment produces large amounts of sludge. Currently, there are many ways of disposing of sludge, such as directly applying sludge to the ground, drying sludge, incinerating sludge, and the like. No matter what treatment method is adopted for the sludge, strict requirements are imposed on the water content of the sludge. For example, the sludge water content of mixed landfill sludge in municipal wastewater treatment plant (GBT 23485-2009) is required to be less than 60%; sludge for landscaping in sludge treatment of urban sewage treatment plants (GBT 23486-2009) requires that the water content of the sludge is less than 40 percent; sludge for separate incineration of sludge disposal in urban sewage treatment plants (GBT 24602-2009) requires that the water content of sludge subjected to self-sustaining incineration is less than 50%, and the low-temperature heat value is greater than 5000kJ/kg; sludge quality for brickmaking in sludge disposal of municipal wastewater treatment plants (GBT 23485-2009) requires that the water content of the sludge is less than 40%.

After the sludge is dehydrated and dried, the volume is greatly reduced, the residual substances of the dried sludge are relatively stable, the malodorous and pathogenic organisms are greatly removed, and the heat value and the nutrient content of the sludge are reserved. Therefore, it can be said that sludge drying is the prerequisite and key of sludge treatment and disposal technology.

However, the existing sludge drying technology generally has the defect of large dust amount, and the dried product is powdery, so that the utilization approach is limited.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a sludge drying system.

The sludge drying system according to the embodiment of the invention comprises: a sludge bin; the extruding machine comprises a first shell and an extruding roller group arranged in a first cavity of the first shell, a first heat source inlet is formed in the first shell, the first cavity is communicated with a discharge hole of the sludge bin, the extruding roller group comprises a plurality of extruding rollers which are arranged along a first horizontal direction, two adjacent extruding rollers of the extruding roller group are matched, at least one part of the extruding rollers is rotatably arranged, and a plurality of accommodating grooves are formed in the outer peripheral surface of the at least one part of the extruding rollers; and the dryer comprises a second shell and a first heating plate arranged in a second cavity of the second shell, and the second cavity is communicated with the first cavity.

The sludge drying system provided by the embodiment of the invention has the advantages of no dust generation, no environmental pollution, simple treatment process, low equipment investment and low operation cost.

Optionally, each of the squeeze rollers is rotatably disposed, and the accommodating groove is disposed on an outer circumferential surface of each of the squeeze rollers, wherein the rotation directions of each of the squeeze rollers are opposite, and a difference between rotation rates of two adjacent squeeze rollers of the squeeze roller set is greater than or equal to a first preset value, or the rotation directions of two adjacent squeeze rollers of the squeeze roller set are the same.

Optionally, the receiving groove extends along the entire circumference of the press roll, the press further comprising a cleaning member, at least a portion of the cleaning member extending into the receiving groove.

Optionally, the dryer includes a plurality of first heating plates and a plurality of second heating plates, each of the first heating plates is annular, each of the second heating plates is annular, the plurality of first heating plates and the plurality of second heating plates are alternately arranged in the vertical direction, an outer edge of each of the second heating plates is located at an outer side of the outer edge of each of the first heating plates, an inner edge of each of the first heating plates is located at an inner side of the inner edge of each of the second heating plates,

optionally, the dryer further comprises: a shaft passing through the plurality of first heating plates and the plurality of second heating plates in an up-down direction; a plurality of first mounting members and a plurality of second mounting members, which are alternately provided on the shaft in an up-down direction, wherein the plurality of first mounting members are located above the plurality of first heating plates in a one-to-one correspondence, and the plurality of second mounting members are located above the plurality of second heating plates in a one-to-one correspondence; the first toggle pieces are arranged on the first mounting pieces in a one-to-one corresponding mode, and each first toggle piece is in an outer spiral shape; and the second toggle pieces are arranged on the second mounting pieces in a one-to-one correspondence mode, and each second toggle piece is in an inner spiral shape.

Optionally, the sludge drying system further comprises: a feed inlet of the sludge pump is communicated with a discharge outlet of the sludge bin; and the sludge buffering bin is communicated with a discharge hole of the sludge pump, and a discharge hole of the sludge buffering bin is communicated with the first cavity.

Optionally, the sludge drying system further comprises: a dry bin; and the elevator is arranged between the discharge hole of the dryer and the feed inlet of the dry material bin.

Optionally, the second housing is provided with an inert gas inlet communicated with the second chamber, the first housing is provided with an inert gas outlet communicated with the first chamber, the sludge drying system further comprises a blower, and an air outlet of the blower is communicated with the inert gas inlet.

Optionally, the sludge drying system further comprises: the gas inlet of the cooling spray tower is communicated with the inert gas outlet; and the gas inlet of the gas-water separator is communicated with the gas outlet of the cooling spray tower.

The sludge drying treatment process implemented by the sludge drying system according to the embodiment of the invention comprises the following steps: conveying the sludge in the sludge bin into an extruder; granulating and dewatering the sludge simultaneously in the extruder to obtain sludge granules; and dewatering the sludge granules to obtain finished granules.

Optionally, the water content of the sludge is less than or equal to 85%, the particle size of the finished product particles is greater than or equal to 6 mm and less than or equal to 8 mm, the water content of the finished product particles is less than 40%, and optionally, the water content of the sludge is less than or equal to 80%.

Drawings

FIG. 1 is a schematic view of a drying and granulating apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of a pressing roll of the dry granulation apparatus according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first heating plate (a second heating plate) of a dry granulation apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first heating plate (a second heating plate) of a dry granulation apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a sub-pan of a first heating pan (second heating pan) of a drying and granulating apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a sludge drying system according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A dry granulation apparatus 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings. As shown in fig. 1 to 5, a dry granulation apparatus 100 according to an embodiment of the present invention includes an extruder 1 and a dryer 2.

The extruder 1 comprises a first housing 11 and a set of extrusion rollers 12, the first housing 11 having a first chamber 111, the set of extrusion rollers 12 being provided in the first chamber 111. The first housing 11 is provided with a first heat source inlet so that a heat source is introduced into the first chamber 111 through the first heat source inlet. The squeeze roller group 12 includes a plurality of squeeze rollers 121 arranged in the first horizontal direction, and adjacent two squeeze rollers 121 of the squeeze roller group 12 are engaged. At least a part of the pressing rollers 121 is rotatably disposed, and a plurality of receiving grooves 1212 are formed on an outer circumferential surface 1211 of at least a part of the pressing rollers 121.

The dryer 2 includes a second housing 21 and a first heating plate 22, the second housing 21 having a second chamber 211, the second chamber 211 communicating with the first chamber 111. The first heating plate 22 is provided in the second chamber 211. A second heat source inlet is provided on the second housing 21 so that the heat source enters the first heating pan 22 through the second heat source inlet.

A process of treating sludge using the dry granulation apparatus 100 according to an embodiment of the present invention will be described with reference to fig. 1 to 5.

The sludge entered into the first chamber 111 may fall between adjacent two squeeze rollers 121, and the adjacent two squeeze rollers 121 cooperate to squeeze the sludge into the plurality of receiving grooves 1212. The heat source entering into the first chamber 111 may dry the sludge in the holding tank 1212 so as to dry the sludge in the holding tank 1212 into sludge particles. Subsequently, the sludge particles come out of the holding tank 1212 and enter the first heating pan 22 in the second chamber 211. The first heating plate 22 heats the sludge particles so as to further dry the sludge particles, and finally finished particles are obtained. The solid content of the finished product particles can reach 60-98%. That is, the ratio of the weight of solids in the finished granules to the weight of the finished granules is (0.6-0.98): 1, the ratio of the weight of water in the finished granules to the weight of the finished granules is (0.02-0.4): 1.

the sludge treatment mode in the related technology is to dry the sludge into powdery semi-finished products and then granulate the semi-finished products so as to recycle the sludge. Therefore, the sludge treatment mode in the related technology has the defects of large dust amount, complex treatment process, high equipment investment and high operation cost.

The drying and granulating apparatus 100 according to the embodiment of the present invention may separate sludge into small pieces of sludge filled in the housing tank 1212 by providing the plurality of housing tanks 1212 on the outer circumferential surface 1211 of the squeeze roller 121, and dry the small pieces of sludge to obtain sludge particles. Therefore, the drying and granulating device 100 according to the embodiment of the invention can simultaneously complete drying, dewatering and granulating, so that finished granules can be obtained without producing powdery sludge.

Therefore, the drying and granulating device 100 according to the embodiment of the present invention has the advantages of no dust generation, no environmental pollution, simple treatment process, low equipment investment, low operation cost, etc.

The invention also provides a sludge drying system 1000. As shown in fig. 1 to 6, a sludge drying system 1000 according to an embodiment of the present invention includes a sludge bin 800, an extruder 1, and a dryer 2.

The extruder 1 comprises a first housing 11 and a set of extrusion rollers 12, the first housing 11 having a first chamber 111, the set of extrusion rollers 12 being provided within the first chamber 111. The first chamber 111 is communicated with the discharge hole of the sludge bin 800, so that the sludge in the sludge bin 800 can enter the first chamber 111. The first housing 11 is provided with a first heat source inlet so that a heat source is introduced into the first chamber 111 through the first heat source inlet. The squeeze roller group 12 includes a plurality of squeeze rollers 121 arranged in the first horizontal direction, and adjacent two squeeze rollers 121 of the squeeze roller group 12 are engaged. At least a part of the pressing rollers 121 is rotatably disposed, and a plurality of receiving grooves 1212 are formed on an outer circumferential surface 1211 of at least a part of the pressing rollers 121.

The dryer 2 includes a second housing 21 and a first heating plate 22, the second housing 21 having a second chamber 211, the second chamber 211 communicating with the first chamber 111. The first heating plate 22 is provided in the second chamber 211. The second housing 21 is provided with a second heat source inlet so that the heat source enters the first heating plate 22 through the second heat source inlet.

Therefore, the sludge drying system 1000 according to the embodiment of the invention has the advantages of no dust generation, no environmental pollution, simple treatment process, low equipment investment, low operation cost and the like.

As shown in fig. 1 to 6, the sludge drying system 1000 includes a sludge bin 800, a sludge pump 200, a sludge buffer bin 3, an extruder 1 and a dryer 2. The sludge drying system 1000 and the drying and granulating device 100 can be used for treating sludge with water content of about 80%.

For example, the sludge drying system 1000 and the drying and granulating apparatus 100 may be used to treat sludge having a water content of 85% or less. Optionally, the water content of the sludge is less than or equal to 80%. The particle size of the finished product particles is more than or equal to 6 mm and less than or equal to 8 mm. Optionally, the finished pellets have a moisture content of less than 40%.

The feed inlet of sludge pump 200 and the discharge gate intercommunication in sludge warehouse 800, the feed inlet of mud buffering storehouse 3 and the discharge gate intercommunication of sludge pump 200, the discharge gate and the first cavity 111 intercommunication in mud buffering storehouse 3.

The sludge buffer bin 3 is provided with a storage cavity 31, a stirring shaft 32 is arranged in the storage cavity 31, and a plurality of rake blades 33 are arranged on the stirring shaft 32. Therefore, the sludge in the storage cavity 31 can be stirred by the plurality of rake blades 33, so that the bridging phenomenon can be avoided, and the sludge can be favorably introduced into the first chamber 111. The holding cavity 31 is communicated with the first chamber 111 so that the sludge in the holding cavity 31 can enter the first chamber 111.

The extruder 1 comprises a first housing 11 and a plurality of sets of extrusion rollers 12, the first housing 11 having a first chamber 111, the sets of extrusion rollers 12 being provided within the first chamber 111.

As shown in fig. 1, the first housing 11 may alternatively include a plurality of sub-housings 112, the plurality of sub-housings 112 may be detachably connected in sequence, and the plurality of pressing roller groups 12 may be provided on the plurality of sub-housings 112 in a one-to-one correspondence. In other words, the number of the compression roller sets 12 may be equal to the number of the sub-housings 112, one compression roller set 12 per one sub-housing 112.

Thereby, the number of the sub-housings 112 and the compression roller group 12 can be flexibly selected according to the sludge treatment amount, and the increase and decrease of the compression roller group 12 can be realized by installing and detaching the sub-housings 112 so as to meet the sludge treatment amount. For example, the plurality of press roller groups 12 are provided on the opposite side plates of the plurality of sub-housings 112 in a one-to-one correspondence.

The first housing 11 is provided with a first heat source inlet so that a heat source is introduced into the first chamber 111 therethrough. The heat source may directly heat the sludge in the holding tank 1212, or may indirectly heat the sludge in the holding tank 1212 by heating the squeeze roller 121. The heat source may be steam or heat transfer oil, etc.

At least one of the pressing rollers 121 has a first heating cavity 1213, and the pressing roller 121 is provided with a rotary joint (not shown in the drawings) which cooperates with the first heating cavity 1213 to provide a heat source into the first heating cavity 1213. That is, the heat source may enter the first heating cavity 1213 through the rotary joint. In particular, a first heat source delivery tube may be connected to the rotary joint through the first heat source inlet, and the heat source may pass through the first heat source delivery tube and the rotary joint in that order into the first heating chamber 1213.

The rotary joint may have an entry passage through which the heat source enters the first heating chamber 1213 and an exit passage through which the heat source, having completed the heat exchange, exits the first heating chamber 1213 within the first heating chamber 1213. Alternatively, the pressing roller 121 is provided with two rotary joints, the heat source enters the first heating chamber 1213 through one rotary joint, and the heat source completing the heat exchange in the first heating chamber 1213 exits the first heating chamber 1213 through the other rotary joint.

The squeeze roller group 12 includes a plurality of squeeze rollers 121 arranged in the first horizontal direction, and adjacent two squeeze rollers 121 of the squeeze roller group 12 are engaged. The first horizontal direction is indicated by arrow a in fig. 1, and the vertical direction is indicated by arrow B in fig. 1. Each of the pressing rollers 121 is rotatably provided, and an accommodating groove 1212 is provided on an outer circumferential surface 1211 of each of the pressing rollers 121.

Alternatively, the rotation direction of each of the pressing rollers 121 is opposite, and the difference in the rotation rates of two adjacent pressing rollers 121 of the pressing roller group 12 is greater than or equal to a first preset value. Alternatively, the rotation directions of the adjacent two press rolls 121 of the press roll group 12 are the same. Whereby adjacent two squeeze rolls 121 of the set of squeeze rolls 12 can be operated at a differential speed to create relative motion between the crossovers so that the sludge can be pulled into fluffy small pieces of sludge to make the sludge particles easier to form.

As shown in fig. 2, the receiving slots 1212 are dovetail slots. Therefore, the small sludge in the holding tank 1212 is not easy to fall off, so that the residence time of the small sludge on the squeeze roller 121 can be prolonged, the effective heating area of the squeeze roller 121 can be increased, and the volumes of the extruder 1 and the drying and granulating device 100 can be further reduced.

Optionally, the width of the groove bottom of the receiving groove 1212 is greater than the width of the notch of the receiving groove 1212. Thereby, the residence time of the small sludge on the squeeze roller 121 can be further prolonged, so that the effective heating area of the squeeze roller 121 is further increased, and the volumes of the extruder 1 and the drying and granulating apparatus 100 are further reduced. The width of the groove bottom of the accommodation groove 1212 refers to the dimension of the groove bottom of the accommodation groove 1212 in the axial direction of the pressing roller 121, and the width of the notch of the accommodation groove 1212 refers to the dimension of the notch of the accommodation groove 1212 in the axial direction of the pressing roller 121.

As shown in fig. 2, the accommodating grooves 1212 of the adjacent two press rolls 121 of the press roll group 12 are alternately arranged in the axial direction of the press rolls 121, which is indicated by an arrow C in fig. 2. This can improve the sludge treatment capacity of the drying and granulating apparatus 100.

Alternatively, the distance of the notches of the accommodating grooves 1212 of the adjacent two pressing rolls 121 of the pressing roll group 12 in the axial direction of the pressing rolls 121 is less than or equal to a second preset value. This can improve the sludge treatment capacity of the drying and granulating apparatus 100.

As shown in fig. 1, the accommodating groove 1212 extends along the entire circumferential direction of the pressing roller 121. The extruder 1 further comprises a cleaning member 14, at least a portion of the cleaning member 14 extending into the receiving groove 1212. From this not only can utilize clearance piece 14 to make this mud granule after being heated break away from holding tank 1212 to be favorable to this mud granule after being heated to break away from holding tank 1212, can utilize the remaining mud in clearance piece 14 clearance holding tank 1212 in addition, so as to be favorable to new fritter mud to enter into in the holding tank 1212.

As shown in fig. 1, the plurality of press roller sets 12 are provided, and the plurality of press roller sets 12 are provided at intervals in the vertical direction. The extruder 1 further includes a plurality of first flow field plates 131 and a plurality of second flow field plates 132 provided in the first chamber 111, each of the first flow field plates 131 and each of the second flow field plates 132 being disposed obliquely.

The squeeze roller group 12 is located between the plurality of first flow field plates 131 and the plurality of second flow field plates 132 in the first horizontal direction, and the plurality of first flow field plates 131 and the plurality of second flow field plates 132 are alternately arranged in the vertical direction. The flow direction of the hot gas from the dryer 2 can thereby be changed by means of the first and second flow field plates 131, 132, i.e. the hot gas is changed from a substantially vertical flow to a substantially horizontal flow by means of the first and second flow field plates 131, 132, in order to deflect the hot gas, so that the sludge particles in the holding tank 1212 can be heated by the hot gas by means of lateral flushing.

In order to make the technical solution of the present application easier to understand, the technical solution of the present application will be further described below by taking the first horizontal direction as an example of being consistent with the left-right direction. The left-right direction is indicated by an arrow D in fig. 1. The plurality of first flow path plates 131 may be positioned at the left side of the plurality of compression roller sets 12, and the plurality of second flow path plates 132 may be positioned at the right side of the plurality of compression roller sets 12. The hot gas from the dryer 2 flows from left to right after being blocked by the first flow path plate 131; the hot air from the dryer 2 flows from right to left after being blocked by the second flow field plate 132.

As shown in fig. 1, the lower portion of the first housing 11 is provided with a gas inlet 113 communicating with the first chamber 111, and the upper portion of the first housing 11 is provided with a gas outlet 114 communicating with the first chamber 111. Thereby, drying gas (preferably hot drying gas) can be fed into the first chamber 111 through the gas inlet 113, the drying gas can carry away the evaporated water vapor in the first chamber 111 and leave the first chamber 111 through the gas outlet 114, i.e. the drying gas and the water vapor in the first chamber 111 leave the first chamber 111 through the gas outlet 114, thereby increasing the drying speed of the sludge.

As shown in fig. 1, the dryer 2 includes a second housing 21 and a first heating plate 22, the second housing 21 having a second chamber 211, the second chamber 211 communicating with the first chamber 111. The first chamber 111 may be located above the second chamber 211 so that the sludge particles enter the second chamber 211 by their own weight.

The first heating plate 22 is provided in the second chamber 211. The second housing 21 is provided with a second heat source inlet so that the heat source enters the first heating plate 22 through the second heat source inlet. The heat source can thus heat the sludge granules on the first heating plate 22, so that the finished granules can be obtained. The heat source may be water vapor or heat transfer oil, etc.

As shown in fig. 1, the dryer 2 includes a plurality of first heating plates 22 and a plurality of second heating plates 23, each of the first heating plates 22 being annular, and each of the second heating plates 23 being annular. Wherein, a plurality of first heating plates 22 and a plurality of second heating plates 23 are arranged alternately in the vertical direction, the outer edge of each second heating plate 23 is positioned at the outer side of the outer edge of each first heating plate 22, and the inner edge of each first heating plate 22 is positioned at the inner side of the inner edge of each second heating plate 23. Thereby, the sludge particles can be heated by the first heating plates 22 and the second heating plates 23, and the solid content of the finished product particles can be further improved.

As shown in fig. 1, the dryer 2 further includes a shaft 24, a plurality of first mounting members 251, a plurality of second mounting members 252, a plurality of first toggle members 261, and a plurality of second toggle members 262. The shaft 24 passes through the plurality of first heating plates 22 and the plurality of second heating plates 23 in the up-down direction, that is, the plurality of first heating plates 22 and the plurality of second heating plates 23 are sleeved on the shaft 24.

The plurality of first mounting members 251 and the plurality of second mounting members 252 are alternately provided on the shaft 24 in the up-down direction. The first mounting members 251 are located above the first heating plates 22 in a one-to-one correspondence, and the second mounting members 252 are located above the second heating plates 23 in a one-to-one correspondence. That is, the number of the first mounting members 251 may be equal to the number of the first heating plate 22, the number of the second mounting members 252 may be equal to the number of the second heating plate 23, one first mounting member 251 is provided above each first heating plate 22, and one second mounting member 252 is provided above each second heating plate 23.

The first toggle pieces 261 are correspondingly arranged on the first mounting pieces 251, and each first toggle piece 261 is in an external spiral shape. In other words, the number of the first toggle pieces 261 may be equal to the number of the first mounting parts 251, and one first toggle piece 261 is provided on each first mounting part 251. The second toggle members 262 are correspondingly disposed on the second mounting members 252, and each of the second toggle members 262 has an inner spiral shape. That is, the number of the second toggle members 262 may be equal to the number of the second mounting members 252, and one second toggle member 262 is disposed on each of the second mounting members 252.

Since each first toggle member 261 is in an outer spiral shape, the first toggle member 261 can toggle the sludge particles on the first heating plate 22 outwards. Since the outer edge of each second heating pan 23 is located outside the outer edge of each first heating pan 22, the sludge particles moving outward can fall onto the second heating pan 23 after leaving the first heating pan 22.

Since each of the second toggle members 262 has an internal spiral shape, the second toggle members 262 can toggle the sludge particles on the second heating pan 23 inwards. Since the inner edge of each first heating pan 22 is located inside the inner edge of each second heating pan 23, the sludge particles moving inward can fall onto the first heating pan 22 after leaving the second heating pan 23. Thereby, the sludge particles can be heated by the first heating plates 22 and the second heating plates 23, and the finished product particles can be obtained.

As shown in fig. 1, a lower edge of each of the first toggle members 261 is adjacent to an upper surface of the corresponding first heating pan 22 in the up-down direction, so that the first toggle member 261 can more effectively toggle the sludge particles on the first heating pan 22. The lower edge of each second toggle member 262 is adjacent to the upper surface of the corresponding second heating pan 23 in the up-down direction, so that the second toggle member 262 can more effectively toggle the sludge particles on the second heating pan 23.

As shown in fig. 3, each of the first heating plate 22 and the second heating plate 23 includes a plate body 221, a plurality of first partition plates 222, and a plurality of second partition plates 223. The tray body 221 has a second heating cavity 2211, and the second heating cavity 2211 has a steam inlet 2212 and a steam outlet 2213. Specifically, a second heat source delivery pipe may pass through the second heat source inlet to connect with the steam inlet 2212, and the heat source may pass through the second heat source delivery pipe and the steam inlet 2212 into the second heating cavity 2211. The heat source in the second heating chamber 2211 exchanges heat with the sludge particles on the first heating plate 22 and the second heating plate 23, and then leaves the second heating chamber 2211 through the steam outlet 2213.

The plurality of first partition plates 222 and the plurality of second partition plates 223 are alternately and spacedly provided in the second heating cavity 2211 along the circumferential direction of the tray body 221. In other words, the plurality of first partition plates 222 and the plurality of second partition plates 223 are alternately provided in the second heating cavity 2211 in the circumferential direction of the tray body 221, and the plurality of first partition plates 222 and the plurality of second partition plates 223 are provided in the second heating cavity 2211 at intervals in the circumferential direction of the tray body 221.

An outer end surface of each first partition plate 222 is connected to the outer circumferential wall surface of the second heating chamber 2211, and an inner end surface of each first partition plate 222 is spaced apart from the inner circumferential wall surface of the second heating chamber 2211 in the radial direction of the tray body 221. An inner end surface of one second partition plate 223 is connected to the inner circumferential wall surface of the second heating chamber 2211, an outer end surface of the one second partition plate 223 is connected to the outer circumferential wall surface of the second heating chamber 2211, and the one second partition plate 223 is located between the steam inlet 2212 and the steam outlet 2213 in the circumferential direction of the tray body 221. The one second partition plate 223 may thus be used to separate the steam inlet 2212 from the steam outlet 2213, thereby avoiding entry of heat from the steam inlet 2212 to the heat source to directly exit the second heating cavity 2211 through the steam outlet 2213.

Inner end faces of the remaining second partition plates 223 are connected to the inner circumferential wall face of the second heating chamber 2211, and outer end faces of the remaining second partition plates 223 are spaced apart from the outer circumferential wall face of the second heating chamber 2211 in the radial direction of the tray body 221. Thereby, a flow path of the heat source in the second heating cavity 2211 can be greatly extended, so that the heat of the heat source can be sufficiently utilized.

As shown in fig. 4 and 5, each of the first heating plate 22 and the second heating plate 23 includes a tray 221, and the tray 221 includes a plurality of sub-trays 225 connected in series, and each sub-tray 225 has a fan-ring shape. Wherein each sub-disc 225 has a second heating cavity 2211, and the second heating cavity 2211 has a steam inlet 2212 and a steam outlet 2213. Thereby, the difficulty in manufacturing the first heating plate 22 and the second heating plate 23 can be reduced.

As shown in fig. 4 and 5, a plurality of first partition plates 222 and a plurality of second partition plates 223 are provided in each second heating cavity 2211. The plurality of first partition plates 222 and the plurality of second partition plates 223 are alternately and intermittently provided between the steam inlet 2212 and the steam outlet 2213 in the circumferential direction of the disc body 221. Each second partition plate 223 is located between adjacent two first partition plates 222 in the circumferential direction of the disc body 221.

An outer end surface of each first partition plate 222 is connected to an outer side wall surface of the second heating chamber 2211, and an inner end surface of each first partition plate 222 is spaced apart from an inner side wall surface of the second heating chamber 2211 in the radial direction of the tray body 221. An inner end surface of each second partition plate 223 is connected to an inner side wall surface of the second heating chamber 2211, and an outer end surface of each second partition plate 223 is spaced apart from an outer side wall surface of the second heating chamber 2211 in the radial direction of the tray body 221. The structure of the sub-disc 225 can be made more rational.

As shown in fig. 6, the sludge drying system 1000 further includes a dry material bin 300 and a lifting machine 400, wherein the lifting machine 400 is disposed between the discharge port of the dryer 2 and the feed port of the dry material bin 300. The elevator 400 can thus transfer the finished pellets discharged from the inlet of the dry bin 300 into the dry bin 300.

As shown in fig. 6, the second housing 21 is provided with an inert gas inlet communicating with the second chamber 211, and the first housing 11 is provided with an inert gas outlet communicating with the first chamber 111. The sludge drying system further comprises a blower 500, and an air outlet of the blower 500 is communicated with the inert gas inlet. The blower 500 may deliver the inert gas into the second chamber 211, and then the inert gas flows from the second chamber 211 into the first chamber 111 and exits the first chamber 111 from the inert gas outlet. Therefore, the inert gas can take away the evaporated water vapor in the first chamber 111 and the second chamber 211, so that the drying speed of the sludge and the sludge particles can be increased.

As shown in fig. 6, the sludge drying system 1000 further includes a cooling spray tower 600 and a gas-water separator 700. The gas inlet of the cooling spray tower 600 is communicated with the inert gas outlet, and the gas inlet of the gas-water separator 700 is communicated with the gas outlet of the cooling spray tower 600.

The inert gas discharged from the inert gas outlet of the extruder 1 enters the cooling spray tower 600 at the bottom thereof and is brought into counter-current contact with the cooling spray water at the upper portion thereof in the cooling spray tower 600. The inert gas is washed and cooled and then enters the gas-water separator 700, and water at the bottom of the cooling spray tower 600 is pumped by circulating water for water removal treatment. Inside the gas-water separator 700, the moisture carried in the inert gas is separated, and the separated water enters the water treatment system. The inert gas after passing through the gas-water separator 700 is led out by a draught fan. The inert gas led out by the draught fan can enter an incineration system and can also be discharged after being treated.

The invention also provides a sludge drying treatment process implemented by the sludge drying system 1000 according to the above embodiment of the invention. The sludge drying treatment process provided by the embodiment of the invention comprises the following steps:

conveying the sludge in the sludge bin into an extruder 1;

granulating and dewatering the sludge simultaneously in an extruder 1 to obtain sludge granules; and

the sludge granules are dewatered to obtain finished granules.

The sludge drying treatment process provided by the embodiment of the invention has the advantages of no dust generation, no environmental pollution, simple treatment process, low equipment investment, low operation cost and the like.

The sludge drying treatment process provided by the embodiment of the invention can be used for treating sludge with the water content of about 80%. For example, the sludge drying treatment process according to the embodiment of the invention can be used for treating sludge with the water content of 85% or less. Optionally, the water content of the sludge is less than or equal to 80%. The particle size of the finished product particles is more than or equal to 6 mm and less than or equal to 8 mm. Optionally, the finished pellets have a moisture content of less than 40%.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A sludge drying system, comprising:

a sludge bin;

the extruding machine comprises a first shell and an extruding roller group arranged in a first cavity of the first shell, wherein a first heat source inlet is formed in the first shell, the first cavity is communicated with a discharge hole of the sludge bin, the extruding roller group comprises a plurality of extruding rollers which are arranged along a first horizontal direction, two adjacent extruding rollers of the extruding roller group are matched, at least one part of the plurality of extruding rollers is rotatably arranged, a plurality of accommodating grooves are formed in the outer peripheral surface of at least one part of the plurality of extruding rollers, at least one extruding roller is provided with a first heating cavity, a rotary joint is arranged on the extruding rollers, and the rotary joint is matched with the first heating cavity so as to provide a heat source into the first heating cavity;

the dryer comprises a second shell and a first heating plate arranged in a second cavity of the second shell, the second cavity is communicated with the first cavity, the dryer comprises a plurality of first heating plates and a plurality of second heating plates, the first heating plates and the second heating plates are alternately arranged in the vertical direction, the outer edge of each second heating plate is positioned on the outer side of the outer edge of each first heating plate, and the inner edge of each first heating plate is positioned on the inner side of the inner edge of each second heating plate;

a discharge port of the sludge buffer bin is communicated with the first cavity, the sludge buffer bin is provided with a storage cavity, a stirring shaft is arranged in the storage cavity, and a plurality of rake blades are arranged on the stirring shaft;

each of the first heating pan and the second heating pan includes a tray body having a second heating chamber having a steam inlet and a steam outlet, a plurality of first partition plates and a plurality of second partition plates, an outer end surface of each of the first partition plates being connected to an outer peripheral wall surface of the second heating chamber, an inner end surface of each of the first partition plates being spaced apart from the inner peripheral wall surface of the second heating chamber in a radial direction of the tray body, an inner end surface of the second partition plate being connected to the inner peripheral wall surface of the second heating chamber, an outer end surface of the second partition plate being connected to the outer peripheral wall surface of the second heating chamber, the second partition plate being located between the steam inlet and the steam outlet in a circumferential direction of the tray body;

the width of the groove bottom of the accommodating groove is larger than that of the notch of the accommodating groove, the rotating directions of the squeezing rollers are opposite, the difference value of the rotating speeds of two adjacent squeezing rollers of the squeezing roller group is larger than or equal to a first preset value,

alternatively, the rotation directions of two adjacent press rolls of the press roll group are the same.

2. The sludge drying system of claim 1 wherein the receiving tank extends along an entire circumference of the squeeze roller, the press further comprising a cleaning member, at least a portion of the cleaning member extending into the receiving tank.

3. The sludge drying system of claim 1, wherein each of the first heating plates is annular and each of the second heating plates is annular,

the dryer further includes:

a shaft passing through the plurality of first heating plates and the plurality of second heating plates in an up-down direction;

a plurality of first mounting members and a plurality of second mounting members, which are alternately arranged on the shaft in an up-and-down direction, wherein the plurality of first mounting members are located above the plurality of first heating plates in a one-to-one correspondence, and the plurality of second mounting members are located above the plurality of second heating plates in a one-to-one correspondence;

the first toggle pieces are arranged on the first mounting pieces in a one-to-one correspondence manner, and each first toggle piece is in an external spiral shape; and

the second stirring pieces are arranged on the second mounting pieces in a one-to-one corresponding mode, and each second stirring piece is of an inner spiral shape.

4. The sludge drying system of claim 1, further comprising:

the sludge pump, the feed inlet of sludge pump with the discharge gate intercommunication in mud storehouse, the feed inlet in mud buffer storage storehouse with the discharge gate intercommunication of sludge pump.

5. The sludge drying system of claim 1, further comprising:

a dry bin; and

the lifting machine is arranged between the discharge port of the drying machine and the feed inlet of the dry material bin.

6. The sludge drying system of claim 1, wherein the second housing is provided with an inert gas inlet in communication with the second chamber, the first housing is provided with an inert gas outlet in communication with the first chamber, the sludge drying system further comprises a blower, and an air outlet of the blower is in communication with the inert gas inlet.

7. The sludge drying system of claim 6, further comprising:

the gas inlet of the cooling spray tower is communicated with the inert gas outlet; and

and the gas inlet of the gas-water separator is communicated with the gas outlet of the cooling spray tower.

8. A sludge drying treatment process implemented by using the sludge drying system according to any one of claims 1 to 7, which is characterized by comprising the following steps:

conveying the sludge in the sludge bin into an extruder;

granulating and dewatering the sludge simultaneously in the extruder to obtain sludge granules; and

dewatering the sludge granules to obtain finished granules.

9. The sludge drying treatment process as claimed in claim 8, wherein the water content of the sludge is less than or equal to 85%, the particle size of the finished product particles is greater than or equal to 6 mm and less than or equal to 8 mm, and the water content of the finished product particles is less than 40%.

10. The sludge drying treatment process according to claim 9, wherein the water content of the sludge is less than or equal to 80%.

Images