Exhaust gas purification and heat recovery device and method

Abstract

The present invention relates to an exhaust gas purification and heat recovery device (A) for sludge treatment, comprising: a housing (1) defining an upper chamber (101) and a lower chamber (103) separated by a horizontal partition (105), provided with a first gas inlet (101a) communicating with the upper chamber (101) and a first gas outlet (103a) communicating with the lower chamber (103), the housing (1) further defining a separation chamber (102); at least one first heat exchanger (6) and at least one compression device (8) arranged in the lower chamber (103); the guide ring (9) is arranged in the upper cavity (101) and is communicated with the first gas inlet (101a); the spraying pipe (2) is arranged below the guide ring (9); the purification and heat exchange box (12c) is arranged on the horizontal partition plate (105) in the upper cavity (101); at least one second heat exchanger (5) arranged in the purification and heat exchange tank (12c); and the cyclone separation device (10) is arranged in the separation chamber (102).

Description

Technical Field

[0001] The present invention relates to the field of sludge drying, and more specifically, to a waste gas purification and heat recovery device and method. Background Art

[0002] With the continuous development of urbanization, the amount of sewage generated in industrial production and life that needs to be treated is gradually increasing. As a byproduct of sewage treatment, the output of sludge is also increasing. Compared with sewage, sludge treatment is more difficult. At present, sludge drying treatment is a relatively effective sludge treatment method. Sludge drying treatment usually adopts direct thermal drying, and the dried medium is recycled and reused.

[0003] A large amount of waste gas will be released during the sludge thermal drying process. Its composition is complex and diverse, and it is a mixture of various organic and inorganic gases. If it is discharged directly, it will cause serious secondary pollution to the surrounding environment, seriously endanger the human living environment, and cause heat loss.

[0004] Therefore, there are some waste gas treatment methods, such as biological filtration, waste gas absorption tower, dust collector, etc., but it is difficult to achieve effective waste gas treatment and heat recovery. The dried waste gas is discharged after treatment, and the heat carried by the waste gas is not recovered and reused, which increases the energy consumption cost of drying.

[0005] Existing heat recovery equipment for sludge drying usually recovers and reuses the heat of the waste gas after sludge drying by heat exchange. However, the heat recovery efficiency of existing heat recovery equipment is low, and the sludge impurities contained in the waste gas will clog the heat recovery equipment and cause corrosion, affecting the efficiency of heat recovery.

[0006] Therefore, there is a need for an exhaust gas purification and heat recovery device and method that can effectively purify exhaust gas and recover heat during the sludge drying process. Summary of the invention

[0007] In order to solve the above problems, the present invention proposes a waste gas purification and heat recovery device and method for sludge treatment.

[0008] According to one aspect of the present invention, there is provided a waste gas purification and heat recovery device for sludge treatment, comprising:

[0009] A shell, wherein the shell defines an upper chamber and a lower chamber separated by a horizontal partition, the shell is provided with a first gas inlet communicating with the upper chamber and a first gas outlet communicating with the lower chamber, the shell further defines a separation chamber located on a side of the upper chamber and the lower chamber away from the first gas inlet, the separation chamber being communicated with the upper chamber via a communication port;

[0010] at least one first heat exchanger and at least one compression device disposed in the lower chamber;

[0011] a guide ring disposed in the upper chamber and in communication with the first gas inlet;

[0012] A spray pipe arranged below the guide ring;

[0013] A purification and heat exchange box disposed on a horizontal partition in the upper chamber;

[0014] at least one second heat exchanger disposed in the purification and heat exchange tank; and

[0015] A cyclone separation device is arranged in the separation chamber,

[0016] The waste gas after sludge treatment is introduced into the upper chamber through the first gas inlet, guided in the circumferential direction by the guide ring, and passes through the spray pipe. It is washed and heat-exchanged by the spray liquid sprayed from the spray pipe to produce a primary purified gas. The primary purified gas enters the separation chamber through the connecting port.

[0017] The primary purified gas is separated by a cyclone separation device in the separation chamber to produce a secondary purified gas.

[0018] The first heat exchange medium circulates between at least one compression device, the first heat exchanger and the second heat exchanger via a heat exchange medium loop. The first heat exchange medium is compressed in the at least one compression device to form a compressed first heat exchange medium. The compressed first heat exchange medium is guided to the first heat exchanger to perform heat exchange with the secondary purified gas. The secondary purified gas is heated to form a heated treated gas. The heated treated gas is discharged via the first gas outlet for sludge treatment.

[0019] According to one example, the exhaust gas purification and heat recovery device further includes an exhaust port and a control valve disposed on the top of the separation chamber, wherein the control valve is configured to selectively discharge the secondary purified gas to the environment through the exhaust port.

[0020] According to one example, the exhaust gas purification and heat recovery device further includes at least one third heat exchanger located between the spray pipe and the second heat exchanger.

[0021] According to one example, the exhaust gas purification and heat recovery device further includes a baffle disposed in the upper chamber, the baffle extending obliquely downward from immediately above the communication port away from the communication port and configured to prevent the spray liquid from entering the separation chamber.

[0022] According to one example, the baffle is a curved baffle.

[0023] According to one example, the exhaust gas purification and heat recovery device further comprises at least one ventilation device between the compression device and the first heat exchanger, wherein the ventilation device is used to provide the secondary purified gas to the first heat exchanger.

[0024] According to one example, a cyclone separation device includes a cylindrical body, a top cover that closes the top end of the cylindrical body and is provided with an outlet, an inlet joint that extends tangentially from the upper part of the cylindrical body to the connecting port, spiral blades arranged on the inner wall of the cylindrical body, and a central tube that extends downward around the outlet of the top cover, wherein the cylindrical body is arranged in a separation chamber, and there is a peripheral space between the inner wall of the separation chamber and the cylindrical body, so that the secondary purified gas can be guided to the lower chamber through the peripheral space.

[0025] According to one example, the cyclone separation device also includes a sewage collecting portion located at the bottom of the cylindrical body, a sewage outlet arranged at the lower part of the sewage collecting portion, and a water outlet arranged on the lower side of the cylindrical body, the length of the central tube is smaller than the length of the cylindrical body, and the water outlet is higher than the sewage outlet.

[0026] According to one example, the sewage outlet is arranged at the bottom of the sewage collecting part.

[0027] According to one example, the exhaust gas purification and heat recovery device further includes a defoaming device disposed between the lower chamber and the separation chamber.

[0028] According to one example, the second heat exchanger is arranged in series with the third heat exchanger.

[0029] According to one example, the second heat exchanger is arranged in parallel with the third heat exchanger.

[0030] According to another aspect of the present invention, there is provided a method for purifying and recovering waste gas using the waste gas purification and heat recovery device described above, comprising:

[0031] The waste gas after sludge treatment is introduced into the upper chamber through the first gas inlet, guided in the circumferential direction by the guide ring, passed through the spray pipe, and washed and heat-exchanged by the spray liquid sprayed from the spray pipe to produce a primary purified gas;

[0032] The primary purified gas is introduced into the separation chamber through the communication port, and the primary purified gas is separated by the cyclone separation device in the separation chamber to generate secondary purified gas;

[0033] directing the secondary purified gas to the lower chamber through the inner wall of the separation chamber and the peripheral space between the cylindrical body, exchanging heat with the first heat exchange medium flowing through the first heat exchanger in the lower chamber, and heating the secondary purified gas to form a heated process gas; and

[0034] The heated process gas is discharged through the first gas outlet for sludge treatment.

[0035] Other exemplary embodiments of the present invention are apparent from the detailed description provided below.It should be understood that, although the detailed description and specific examples disclose exemplary embodiments of the present invention, they are only for illustrative purposes and are not intended to limit the scope of the present invention.In addition, the present disclosure explicitly includes the combination and sub-combination of the elements and features set forth above and below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 FIG. 4 is a perspective view of a sludge treatment system of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0037] Figure 2 is a cross-sectional view of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0038] Figure 3 is a cross-sectional view of another exemplary exhaust gas purification and heat recovery device according to the present invention, wherein the exhaust gas purification and heat recovery device includes a defoaming device.

[0039] Figure 4 is a cross-sectional view of a cyclone separation device of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0040] Figure 5 FIG. 1 is a top view of a cyclone separation device of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0041] Figure 6 FIG. 4 is a front view of a spray pipe of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0042] Figure 7 FIG. 4 is a bottom view of a spray pipe of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0043] Figure 8 It is a front view of a high-pressure spray device of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0044] Fig. 9 It is a bottom view of a high-pressure spray device of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0045] Fig.10 is a cross-sectional view of a defoaming device of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0046] Fig.11 FIG. 4 is a schematic diagram of a sludge treatment system including an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0047] List of reference numerals:

[0048] A: Exhaust gas purification and heat recovery device;

[0049] B: Blowing device;

[0050] C: Sludge drying device;

[0051] D: Finished product silo device;

[0052] E: Finished product induced draft device;

[0053] F: Bag dust removal device;

[0054] G: induced draft device;

[0055] H: spray tower;

[0056] 1: Shell;

[0057] 2: Spray pipe;

[0058] 3: The third heat exchanger;

[0059] 4: baffle;

[0060] 5: Second heat exchanger;

[0061] 6: first heat exchanger;

[0062] 7: At least one ventilation device;

[0063] 8: at least one compression device;

[0064] 9: Guide ring;

[0065] 10: Cyclone separation device;

[0066] 11: High pressure spray device;

[0067] 12: Defoaming device;

[0068] 101: Upper chamber;

[0069] 102: separation chamber;

[0070] 103: Lower chamber;

[0071] 104: communication port;

[0072] 105: horizontal partition;

[0073] 106: Peripheral space;

[0074] 101a: first gas inlet;

[0075] 102a: Exhaust vent;

[0076] 103a: first gas outlet;

[0077] 10a: Inlet connector;

[0078] 10b: cylindrical body;

[0079] 10c: spiral blade;

[0080] 10d: sewage collection part;

[0081] 10f: center tube;

[0082] 10g: Drain

[0083] 10h: sewage outlet;

[0084] 10k: Top cover;

[0085] 10m: exit;

[0086] 12c: Purification and heat exchange box. DETAILED DESCRIPTION

[0087] The following description is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. As used herein, words such as "upper", "lower", "left", and "right" used herein to define directions generally refer to and are understood as directions associated with the drawings and directions in actual applications.

[0088] With reference to the accompanying drawings, Figure 1 4 is a perspective view of a sludge treatment system of an exemplary exhaust gas purification and heat recovery device A according to the present invention. Figure 2 : is a cross-sectional view of an exemplary exhaust gas purification and heat recovery device A according to the present invention. The exhaust gas purification and heat recovery device A comprises: a shell 1, the shell 1 defines an upper chamber 101 and a lower chamber 103 separated by a horizontal partition 105; at least one first heat exchanger 6 and at least one compression device 8 arranged in the lower chamber 103; a guide ring 9; a spray pipe 2 arranged below the guide ring 9; a purification and heat exchange box 12c arranged on the horizontal partition 105 in the upper chamber 101; at least one second heat exchanger 5 arranged in the purification and heat exchange box 12c; and a cyclone separation device 10 arranged in the separation chamber 102. The purification and heat exchange box 12c is defined by the horizontal partition 105 and the wall of the upper chamber 101 to accommodate the spray liquid for heat recovery. It should be understood that the purification and heat exchange box 12c can also be a separate box placed on the horizontal partition 105 without departing from the scope of the present invention.

[0089] According to one example, the housing 1 is provided with a first gas inlet 101a in communication with the upper chamber 101 and a first gas outlet 103a in communication with the lower chamber 103. The housing 1 further defines a separation chamber 102 located on the side of the upper chamber 101 and the lower chamber 103 away from the first gas inlet 101a. The separation chamber 102 is in communication with the upper chamber 101 via a communication port 104. It should be understood that the positions of the first gas inlet 101a and the first gas outlet 103a are merely exemplary, and the first gas inlet 101a and the first gas outlet 103a may be provided at any suitable position without departing from the scope of the present invention.

[0090] The guide ring 9 is arranged in the upper chamber 101 and communicated with the first gas inlet 101a. The guide ring 9 is arranged at the upper position of the upper chamber 101, and extends in a substantially annular manner around the interior of the shell. The first gas inlet 101a is arranged on the guide ring 9 in a substantially tangential direction, so that the exhaust gas entering through the first gas inlet 101a enters tangentially, and the exhaust gas after sludge treatment is guided circumferentially through the guide ring 9, buffered and more evenly distributed inside the upper chamber 101.

[0091] Thereafter, the exhaust gas flows through the spray pipe 2, and is flushed and heat-exchanged by the spray liquid sprayed from the spray pipe 2 to produce primary purified gas. The primary purified gas enters the separation chamber 102 through the communication port 104. The primary purified gas is separated by the cyclone separation device 10 in the separation chamber 102 to produce secondary purified gas.

[0092] The first heat exchange medium circulates between at least one compression device 8, the first heat exchanger 6 and the second heat exchanger 5 via a heat exchange medium loop. The first heat exchange medium is compressed in at least one compression device 8 to form a compressed first heat exchange medium. The compressed first heat exchange medium is guided to the first heat exchanger 6 to perform heat exchange with the secondary purified gas. The secondary purified gas is heated to form a heated treated gas. The heated treated gas is discharged via the first gas outlet 103a for sludge treatment.

[0093] The exhaust gas purification and heat recovery device A further includes an exhaust port 102a and a control valve disposed on the top of the separation chamber 102, wherein the control valve is configured to selectively discharge the secondary purified gas to the environment through the exhaust port 102a.

[0094] The exhaust gas purification and heat recovery device A also includes at least one third heat exchanger 3 located between the spray pipe 2 and the second heat exchanger 5 to further improve the heat exchange efficiency. A plurality of second heat exchangers 5 can be arranged inside the purification and heat exchange box 12c as needed, and the plurality of second heat exchangers 5 can be arranged in series or in parallel, thereby improving the efficiency of the heat of the spray liquid being transferred to the first heat exchange medium. The exhaust gas entering the purification and heat recovery device A is purified and heat recovered in a closed environment, which prevents the generation of odor, eliminates secondary pollution, and is very environmentally friendly.

[0095] In one embodiment of the present invention, the spray liquid is water. However, the spray liquid is not limited to water, and other suitable liquids may also be used, such as cleaning liquid, ionic liquid, etc.

[0096] Optionally, an additional heat exchanger (not shown) may be provided through which the first heat exchange medium flows so as to transfer heat in the turbid liquid flowing out of the purification and heat exchange tank 12c to the first heat exchange medium, further improving the heat recovery efficiency.

[0097] The exhaust gas purification and heat recovery device A further includes a baffle 4 disposed in the upper chamber 101. The baffle 4 extends obliquely downward from immediately above the communication port 104 away from the communication port 104 and is configured to prevent the spray liquid from entering the separation chamber 102. According to one example, the baffle 4 is an arc-shaped baffle. It should be understood that the baffle 4 can take any other suitable form, such as a baffle formed by two or more flat plates spliced ​​at an angle, without departing from the scope of the present invention.

[0098] The exhaust gas purification and heat recovery device A further comprises at least one ventilation device 7 between the compression device 8 and the first heat exchanger 6, wherein the ventilation device is used to provide the secondary purified gas to the first heat exchanger 6. It should be understood that the position of the compression device 8 can be changed, that is, the compression device 8 can also be arranged between the at least one ventilation device 7 and the first heat exchanger 6 without departing from the scope of the present invention. In one example of the present invention, Figure 1 and 2 As shown, the exhaust gas purification and heat recovery device A includes two layers of compression devices 8 arranged one above the other. However, those skilled in the art should understand that the exhaust gas purification and heat recovery device A includes any number of compression devices 8, and the compression devices 8 can be arranged in any suitable manner, such as being arranged side by side, without departing from the scope of the present invention.

[0099] The first heat exchange medium circulates between at least one compression device 8, the first heat exchanger 6 and the second heat exchanger 5 via a heat exchange medium loop (not shown). For the sake of clarity, the individual medium pipelines of the heat exchange medium loop are not shown. The heat exchange medium loop may include any suitable device, including pipes, control valves and check valves. The compression device 8 receives the first heat exchange medium, which is compressed in at least one compression device 8 to form a compressed first heat exchange medium, which is guided to the first heat exchanger 6 and heat-exchanged with the secondary purified gas introduced into the first heat exchanger 6 from the separation chamber 102, and the secondary purified gas is heated to form a heated treatment gas for a load (e.g., a sludge drying device). The heated treatment gas is discharged via the first gas outlet 103a for sludge treatment. According to one example, after heat exchange in the first heat exchanger, the first heat exchange medium becomes a liquid form.

[0100] Figure 3 : is a cross-sectional view of another exemplary exhaust gas purification and heat recovery device A according to the present invention, wherein the exhaust gas purification and heat recovery device A includes a defoaming device 12. The exhaust gas purification and heat recovery device A includes: a shell 1, the shell 1 defines an upper chamber 101 and a lower chamber 103 separated by a horizontal partition 105; at least one first heat exchanger 6 and at least one compression device 8 arranged in the lower chamber 103; a guide ring 9; a spray pipe 2 arranged below the guide ring 9; a purification and heat exchange box 12c arranged on the horizontal partition 105 in the upper chamber 101; at least one second heat exchanger 5 arranged in the purification and heat exchange box 12c; and a cyclone separation device 10 arranged in the separation chamber 102. The purification and heat exchange box 12c is defined by the horizontal partition 105 and the wall of the upper chamber 101 to accommodate the spray liquid for heat recovery. It should be understood that the purification and heat exchange box 12c can also be a separate box placed on the horizontal partition 105 without departing from the scope of the present invention.

[0101] According to one example, the housing 1 is provided with a first gas inlet 101a in communication with the upper chamber 101 and a first gas outlet 103a in communication with the lower chamber 103. The housing 1 further defines a separation chamber 102 located on the side of the upper chamber 101 and the lower chamber 103 away from the first gas inlet 101a. The separation chamber 102 is in communication with the upper chamber 101 via a communication port 104. It should be understood that the positions of the first gas inlet 101a and the first gas outlet 103a are merely exemplary, and the first gas inlet 101a and the first gas outlet 103a may be provided at any suitable position without departing from the scope of the present invention.

[0102] The guide ring 9 is arranged in the upper chamber 101 and communicated with the first gas inlet 101a. The guide ring 9 is arranged at the upper position of the upper chamber 101, and extends in a substantially annular manner around the interior of the shell. The first gas inlet 101a is arranged on the guide ring 9 in a substantially tangential direction, so that the exhaust gas entering through the first gas inlet 101a enters tangentially, and the exhaust gas after sludge treatment is guided circumferentially through the guide ring 9, buffered and more evenly distributed inside the upper chamber 101.

[0103] Thereafter, the exhaust gas flows through the spray pipe 2, and is flushed and heat-exchanged by the spray liquid sprayed from the spray pipe 2 to produce primary purified gas. The primary purified gas enters the separation chamber 102 through the communication port 104. The primary purified gas is separated by the cyclone separation device 10 in the separation chamber 102 to produce secondary purified gas.

[0104] The first heat exchange medium circulates between at least one compression device 8, the first heat exchanger 6 and the second heat exchanger 5 via a heat exchange medium loop. The first heat exchange medium is compressed in at least one compression device 8 to form a compressed first heat exchange medium. The compressed first heat exchange medium is guided to the first heat exchanger 6 to perform heat exchange with the secondary purified gas. The secondary purified gas is heated to form a heated treated gas. The heated treated gas is discharged via the first gas outlet 103a for sludge treatment.

[0105] The exhaust gas purification and heat recovery device A further includes an exhaust port 102a and a control valve disposed on the top of the separation chamber 102, wherein the control valve is configured to selectively discharge the secondary purified gas to the environment through the exhaust port 102a.

[0106] The exhaust gas purification and heat recovery device A also includes at least one third heat exchanger 3 located between the spray pipe 2 and the second heat exchanger 5 to further improve the heat exchange efficiency. A plurality of second heat exchangers 5 can be arranged inside the purification and heat exchange box 12c as needed, and the plurality of second heat exchangers 5 can be arranged in series or in parallel, thereby improving the efficiency of the heat of the spray liquid being transferred to the first heat exchange medium. The exhaust gas entering the purification and heat recovery device A is purified and heat recovered in a closed environment, which prevents the generation of odor, eliminates secondary pollution, and is very environmentally friendly.

[0107] In one embodiment of the present invention, the spray liquid is water. However, the spray liquid is not limited to water, and other suitable liquids may also be used, such as cleaning liquid, ionic liquid, etc.

[0108] Optionally, an additional heat exchanger (not shown) may be provided through which the first heat exchange medium flows so as to transfer heat in the turbid liquid flowing out of the purification and heat exchange tank 12c to the first heat exchange medium, further improving the heat recovery efficiency.

[0109] The exhaust gas purification and heat recovery device A further includes a baffle 4 disposed in the upper chamber 101. The baffle 4 extends obliquely downward from immediately above the communication port 104 away from the communication port 104 and is configured to prevent the spray liquid from entering the separation chamber 102. According to one example, the baffle 4 is an arc-shaped baffle. It should be understood that the baffle 4 can take any other suitable form, such as a baffle formed by two or more flat plates spliced ​​at an angle, without departing from the scope of the present invention.

[0110] The exhaust gas purification and heat recovery device A further comprises at least one ventilation device 7 between the compression device 8 and the first heat exchanger 6, wherein the ventilation device is used to provide the secondary purified gas to the first heat exchanger 6. It should be understood that the position of the compression device 8 can be changed, that is, the compression device 8 can also be arranged between the at least one ventilation device 7 and the first heat exchanger 6 without departing from the scope of the present invention. In one example of the present invention, Figure 1 and 2 As shown, the exhaust gas purification and heat recovery device A includes two layers of compression devices 8 arranged one above the other. However, those skilled in the art should understand that the exhaust gas purification and heat recovery device A includes any number of compression devices 8, and the compression devices 8 can be arranged in any suitable manner, such as being arranged side by side, without departing from the scope of the present invention.

[0111] The first heat exchange medium circulates between at least one compression device 8, the first heat exchanger 6 and the second heat exchanger 5 via a heat exchange medium loop (not shown). For the sake of clarity, the individual medium pipelines of the heat exchange medium loop are not shown. The heat exchange medium loop may include any suitable device, including pipes, control valves and check valves. The compression device 8 receives the first heat exchange medium, which is compressed in at least one compression device 8 to form a compressed first heat exchange medium, which is guided to the first heat exchanger 6 and heat-exchanged with the secondary purified gas introduced into the first heat exchanger 6 from the separation chamber 102, and the secondary purified gas is heated to form a heated treatment gas for a load (e.g., a sludge drying device). The heated treatment gas is discharged via the first gas outlet 103a for sludge treatment. According to one example, after heat exchange in the first heat exchanger, the first heat exchange medium becomes a liquid form.

[0112] In addition, the exhaust gas purification and heat recovery device A includes a defoamer 12. According to one example, the defoamer 12 includes a shell composed of a six-sided frame, and the upper frame is detachable. Defoaming materials such as multi-faceted balls, swirl plates, stainless steel wire mesh, etc. are placed inside the shell. The defoamer 12 can be set as a drawer type or provided with a rotating wheel for easy cleaning and replacement.

[0113] Figure 44 is a cross-sectional view of a cyclone separation device 10 of an exemplary exhaust gas purification and heat recovery device A according to the present invention. Figure 5 1 is a top view of a cyclone separation device 10 of an exemplary exhaust gas purification and heat recovery device A according to the present invention. The cyclone separation device 10 comprises a cylindrical body 10b, a top cover 10k closing the top end of the cylindrical body 10b and provided with an outlet 10m, an inlet joint 10a extending tangentially from the upper part of the cylindrical body 10b to the communication port 104, a spiral blade 10c provided on the inner wall of the cylindrical body 10b, and a central pipe 10f extending downwardly around the outlet 10m of the top cover 10k, wherein the cylindrical body 10b is provided in a separation chamber 102, and there is a peripheral space 106 between the inner wall of the separation chamber 102 and the cylindrical body 10b, so that the secondary purified gas can be guided to the lower chamber 103 through the peripheral space 106.

[0114] The cyclone separation device 10 further includes a sewage collecting portion 10d at the bottom of the cylindrical body 10b, a sewage outlet 10h provided at the lower part of the sewage collecting portion 10d, and a water outlet 10g provided at the lower side of the cylindrical body 10b, the length of the central pipe 10f is less than the length of the cylindrical body 10b, and the water outlet 10g is higher than the sewage outlet 10h. According to one example, the sewage outlet 10h is provided at the bottom of the sewage collecting portion 10d.

[0115] Figure 6 FIG. 2 is a front view of a spray pipe 2 of an exemplary exhaust gas purification and heat recovery device A according to the present invention. Figure 7 1 is a bottom view of a spray pipe 2 of an exemplary exhaust gas purification and heat recovery device A according to the present invention. The spray pipe 2 includes an annular pipe and an intermediate branch pipe that interconnects the annular pipes. The annular pipe and the intermediate branch pipe are provided with multiple spray ports, and the spray pipe 2 can be provided with a single or multiple water inlets.

[0116] Figure 8 4 is a front view of a high-pressure spray device 11 of an exemplary exhaust gas purification and heat recovery device A according to the present invention. Fig. 9 It is a bottom view of the high-pressure spray device 11 of the exemplary exhaust gas purification and heat recovery device A according to the present invention. The high-pressure spray device 11 can be used as a substitute for the spray pipe 2, or as a supplement to the spray pipe 2. The high-pressure spray device 11 includes a main pipe and a plurality of branch pipes connected to the main pipe. Each branch pipe is equipped with a solenoid valve to control the switch, and each branch pipe is provided with a plurality of nozzles facing the third heat exchanger 3. When the third heat exchanger 3 needs to be sprayed and cleaned, the pump is turned on to control the solenoid valve so that the high-pressure spray liquid enters one or more branch pipes each time and then passes through the nozzle to spray the third heat exchanger 3 with high pressure, so that the third heat exchanger 3 can be cleaned more efficiently and the heat exchange effect can be improved.

[0117] Fig.10: is a cross-sectional view of the defoaming device 12 of the exemplary exhaust gas purification and heat recovery device A according to the present invention. According to one example, the defoaming device 12 includes a shell composed of a six-sided frame, and the upper frame is detachable. Defoaming materials such as multi-faceted balls, swirl plates, stainless steel wire mesh, etc. are placed inside the shell. The defoaming device 12 can be set as a drawer type or provided with a rotating wheel for easy cleaning and replacement.

[0118] Fig.11 Schematic diagram of a sludge treatment system including an exemplary exhaust gas purification and heat recovery device A according to the present invention. According to one example, the sludge treatment system includes an exhaust gas purification and heat recovery device A, a blast device B, a sludge drying device C, a finished product silo device D, a finished product induced draft device E, a bag dust removal device F and an induced draft device G. The sludge treatment system may also include a spray tower H in fluid communication with the exhaust port 102a of the exhaust gas purification and heat recovery device A. The finished sludge after drying by the sludge drying device C enters the finished product silo device D, and then is discharged and loaded. The exhaust gas generated by the sludge drying device C after drying will be collected in the bag dust removal device F for the first step of dust reduction and deodorization treatment. At the same time, the dust exhaust gas generated by the finished product silo device D is also guided to the bag dust removal device F for treatment via the finished product induced draft device E. The gas treated by the bag dust removal device F is brought to the self-cleaning heat recovery device or the exhaust gas purification and heat recovery device A by the induced draft device G, and the exhaust gas is recovered by the exhaust gas purification and heat recovery device A, and secondary purification is performed to produce secondary purified gas. The secondary purified gas is heated by the first heat exchange medium to produce heated treated gas. The heated treated gas is then provided to the sludge drying device C by the blower device B to dry the sludge. From here, we can see the hot air circulation direction of the entire sludge treatment system, and we can also see the importance of heat recovery and dust removal. Although the exhaust gas introduced from the induced draft device G to the exhaust gas purification and heat recovery device A has been treated by the bag dust removal device F, it is inevitable that a small amount of dust will enter the exhaust gas purification and heat recovery device A along with the water vapor and exhaust gas, and the exhaust gas has residual heat. In addition, part of the secondary purified gas from the exhaust gas purification and heat recovery device A can be discharged to the spray tower H for another dust removal and heat recovery, and then guided to the biological deodorization device through the spray tower H for terminal treatment and then discharged to the outside, or directly discharged to the outside after being treated by the spray tower H and meeting the standards.

[0119] The present invention has described certain preferred embodiments and variations thereof. Other variations and changes may occur to those skilled in the art after reading and understanding the specification. Thus, the present invention is not limited to the specific embodiments disclosed as the best mode for carrying out the present invention, and the present invention will include all embodiments falling within the scope of the claims.

Claims

1. A waste gas purification and heat recovery device for sludge treatment (A), comprising: A shell (1), wherein the shell (1) defines an upper chamber (101) and a lower chamber (103) separated by a horizontal partition (105), the shell (1) being provided with a first gas inlet (101a) communicating with the upper chamber (101) and a first gas outlet (103a) communicating with the lower chamber (103), the shell (1) further defining a separation chamber (102) located on a side of the upper chamber (101) and the lower chamber (103) away from the first gas inlet (101a), the separation chamber (102) being communicated with the upper chamber (101) via a communication port (104); at least one first heat exchanger (6) and at least one compression device (8) disposed in the lower chamber (103); A guide ring (9) disposed in the upper chamber (101) and connected to the first gas inlet (101a); A spray pipe (2) arranged below the guide ring (9); A purification and heat exchange box (12c) disposed on a horizontal partition (105) in the upper chamber (101); at least one second heat exchanger (5) disposed in the purification and heat exchange box (12c); and A cyclone separation device (10) is arranged in a separation chamber (102), The waste gas after sludge treatment is introduced into the upper chamber (101) through the first gas inlet (101a), guided in the circumferential direction by the guide ring (9), and passes through the spray pipe (2). The waste gas is washed and heat-exchanged by the spray liquid sprayed from the spray pipe (2) to generate primary purified gas. The primary purified gas enters the separation chamber (102) through the communication port (104). The primary purified gas is separated by the cyclone separation device (10) in the separation chamber (102) to produce secondary purified gas. The first heat exchange medium circulates between at least one compression device (8), a first heat exchanger (6) and a second heat exchanger (5) via a heat exchange medium loop. The first heat exchange medium is compressed in at least one compression device (8) to form a compressed first heat exchange medium. The compressed first heat exchange medium is guided to the first heat exchanger (6) to perform heat exchange with the secondary purified gas. The secondary purified gas is heated to form a heated treated gas. The heated treated gas is discharged via a first gas outlet (103a) for sludge treatment.

2. The exhaust gas purification and heat recovery device (A) according to claim 1 further includes an exhaust port (102a) and a control valve arranged at the top of the separation chamber (102), and the control valve is configured to selectively discharge the secondary purified gas to the environment through the exhaust port (102a).

3. The exhaust gas purification and heat recovery device (A) according to claim 1 further comprises at least one third heat exchanger (3) located between the spray pipe (2) and the second heat exchanger (5).

4. The exhaust gas purification and heat recovery device (A) according to claim 1 further includes a baffle (4) arranged in the upper chamber (101), wherein the baffle (4) extends downwardly at an angle away from the connecting port (104) from immediately above the connecting port (104) and is configured to prevent the spray liquid from entering the separation chamber (102).

5. The exhaust gas purification and heat recovery device (A) according to claim 4, wherein: The baffle (4) is an arc-shaped baffle.

6. The exhaust gas purification and heat recovery device (A) according to claim 1 further comprises at least one ventilation device (7) between the compression device and the first heat exchanger (6), wherein the ventilation device is used to provide secondary purified gas to the first heat exchanger (6).

7. The exhaust gas purification and heat recovery device (A) according to claim 1, wherein: The cyclone separation device (10) comprises a cylindrical body (10b), a top cover (10k) closing the top end of the cylindrical body (10b) and provided with an outlet (10m), an inlet joint (10a) extending tangentially from the upper part of the cylindrical body (10b) to a connecting port (104), spiral blades (10c) arranged on the inner wall of the cylindrical body (10b), and a central tube (10f) extending downward around the outlet (10m) of the top cover (10k), wherein the cylindrical body (10b) is arranged in a separation chamber (102), and an outer space (106) is provided between the inner wall of the separation chamber (102) and the cylindrical body (10b), so that the secondary purified gas can be guided to the lower chamber (103) through the outer space (106).

8. The exhaust gas purification and heat recovery device (A) according to claim 7, wherein: The cyclone separation device (10) also includes a sewage collecting portion (10d) located at the bottom of the cylindrical main body (10b), a sewage outlet (10h) arranged at the lower part of the sewage collecting portion (10d), and a water discharge outlet (10g) arranged on the lower side of the cylindrical main body (10b), the length of the central tube (10f) is shorter than the length of the cylindrical main body (10b), and the water discharge outlet (10g) is higher than the sewage discharge outlet (10h).

9. The exhaust gas purification and heat recovery device (A) according to claim 8, wherein: The sewage outlet (10h) is provided at the bottom of the sewage collecting portion (10d).

10. The exhaust gas purification and heat recovery device (A) according to claim 1, further comprising a defoaming device (12) arranged between the lower chamber (103) and the separation chamber (102).

11. The exhaust gas purification and heat recovery device (A) according to claim 3, wherein: The second heat exchanger is arranged in series with the third heat exchanger.

12. The exhaust gas purification and heat recovery device (A) according to claim 3, wherein: The second heat exchanger is arranged in parallel with the third heat exchanger.

13. A method for purifying and recovering waste gas using the waste gas purification and heat recovery device according to any one of claims 1 to 12, comprising: The waste gas after the sludge treatment is introduced into the upper chamber (101) through the first gas inlet (101a), guided in the circumferential direction through the guide ring (9), passes through the spray pipe (2), and is washed and heat-exchanged by the spray liquid sprayed from the spray pipe (2) to produce a primary purified gas; Introducing the primary purified gas into the separation chamber (102) through the communication port (104), and separating the primary purified gas in the separation chamber (102) by the cyclone separation device (10) to generate secondary purified gas; guiding the secondary purified gas to the lower chamber (103) through the inner wall of the separation chamber (102) and the peripheral space (106) between the cylindrical body (10b), exchanging heat with the first heat exchange medium flowing through the first heat exchanger (6) in the lower chamber (103), and heating the secondary purified gas to form a heated process gas; and The heated treated gas is discharged through the first gas outlet (103a) for sludge treatment.

14. A sludge treatment system comprising: The exhaust gas purification and heat recovery device (A) according to any one of claims 1 to 12; A blast device (B) disposed downstream of the exhaust gas purification and heat recovery device (A); a sludge drying device (C) disposed downstream of the air blowing device (B), the air blowing device (B) being configured to guide the secondary purified gas purified by the exhaust gas purification and heat recovery device (A) to the sludge drying device (C); a dust removal device (F) disposed downstream of the sludge drying device (C); and The induced draft device (G) is arranged downstream of the dust removal device (F), and the induced draft device (G) is configured to guide the exhaust gas processed by the dust removal device (F) to the exhaust gas purification and heat recovery device (A).

15. The sludge treatment system according to claim 14 further comprises a spray tower (H) fluidly connected to the exhaust port (102a) of the exhaust gas purification and heat recovery device (A), and a portion of the secondary purified gas from the exhaust gas purification and heat recovery device (A) is transported to the spray tower (H) for further purification and heat recovery.

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