Exhaust gas purification and heat recovery device and method

Abstract

The invention relates to an exhaust gas purification and heat recovery apparatus and method. The exhaust gas purification and heat recovery device includes: a housing (1) including an upper cover (1b), a bottom plate (1c), a horizontal partition (116), a first side wall, a second side wall opposite to the first side wall, a first end wall (1a), and a second end wall (1d) opposite to the first end wall (1a), and defining a first space (13) and a second space (14) separated by the horizontal partition (116), the shell (1) is provided with a first gas inlet (111) and a first gas outlet (115) which are communicated with the first space (13), and a second gas inlet (122) and a second gas outlet (125) which are communicated with the second space (14); the heat source generating assembly (11) is accommodated in the first space (13) and comprises at least one compression device (112) and at least one first heat exchanger (114); the purification and heat recovery assembly (12) is contained in the second space (14) and comprises a purification and heat exchange box (12c), a second heat exchanger (123), a spraying device (128), a first vertical partition plate (120a) and a second vertical partition plate (120b), and the second heat exchanger (123), the spraying device (128), the first vertical partition plate (120a) and the second vertical partition plate (120b) are arranged in the purification and heat exchange box (12c).

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, the shell comprising an upper cover, a bottom plate, a horizontal partition, a first side wall, a second side wall opposite to the first side wall, a first end wall and a second end wall opposite to the first end wall, and defining a first space and a second space separated by the horizontal partition, the shell being provided with a first gas inlet and a first gas outlet communicating with the first space, and a second gas inlet and a second gas outlet communicating with the second space;

[0010] a heat source generating assembly accommodated in the first space, the heat source generating assembly comprising at least one compression device and at least one first heat exchanger; and

[0011] a purification and heat recovery component accommodated in the second space, the purification and heat recovery component comprising a purification and heat exchange box, a second heat exchanger arranged in the purification and heat exchange box, a spray device, a first vertical partition and a second vertical partition, the first vertical partition and the second vertical partition dividing the second space into three compartments: a first compartment, a second compartment and a third compartment, the second gas inlet is connected to the first compartment, the second gas outlet is connected to the third compartment, the spray device is arranged in the first compartment, the second heat exchanger is at least partially arranged in the second compartment, the first vertical partition is fixed to the horizontal partition, and a first gap is formed between the first vertical partition and the upper cover, the second vertical partition is fixed to the upper cover, and a second gap is formed between the second vertical partition and the horizontal partition,

[0012] 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 introduced into the first heat exchanger, and heat is exchanged with the process gas introduced into the first heat exchanger via the first gas inlet, the process gas is heated to form a heated process gas, and the heated process gas is discharged via the first gas outlet for sludge treatment,

[0013] The waste gas after sludge treatment enters the first compartment through the second gas inlet, and the waste gas is cleaned by the spray liquid of the spray device, and the heat in the waste gas is transferred to the spray liquid. The spray liquid is mixed with the second liquid heat exchange medium in the purification and heat exchange box, and the heat is transferred to the second liquid heat exchange medium to be cooled. The first heat exchange medium flowing through the second heat exchanger exchanges heat with the second liquid heat exchange medium in the purification and heat exchange box, so that the heat of the second liquid heat exchange medium is transferred to the first heat exchange medium flowing through the second heat exchanger. The waste gas flows through the first compartment, the first gap, the second compartment, the second gap and the third compartment in a curved path.

[0014] In one example, the first vertical partition is arranged parallel to the second vertical partition and separated by a certain distance, so that the first compartment is located between the first vertical partition and the second end wall, the second compartment is located between the first vertical partition and the second vertical partition, and the third compartment is located between the second vertical partition and the first end wall, the first gas inlet is arranged on the first end wall, the first gas outlet is arranged on the second end wall, the second gas inlet is arranged on the second end wall, and the second gas outlet is arranged on the first end wall.

[0015] In one example, the purification and heat recovery assembly further comprises at least one purification device disposed in the first compartment, the purification device being located above the second gas inlet.

[0016] In one example, the spray device is located above the purification device and close to the upper cover, and the spray device is provided with a plurality of spray holes.

[0017] In one example, the spray device extends into the second compartment in a horizontal direction.

[0018] In one example, the purification device includes an upper partition net and a lower partition net extending between a first vertical partition plate and a second end wall, and a plurality of purification balls retained between the lower partition net and the upper partition net, each purification ball being provided with at least one ball hole for absorbing impurities and moisture in the exhaust gas.

[0019] In one example, the first vertical baffle and the second vertical baffle are each fixed to the first side wall and the second side wall, and the lower end of the second vertical baffle extends above the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank.

[0020] In one example, the first and second vertical partitions are each fixed to the first and second side walls, and the lower end of the second vertical partition extends below the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank.

[0021] In one example, a portion of the first vertical partition below the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank is provided with a plurality of holes to facilitate the flow of the second liquid heat exchange medium therethrough.

[0022] In one example, the purification and heat recovery assembly further includes a third heat exchanger disposed in the second compartment, and the purified exhaust gas flows through the third heat exchanger for heat exchange with the first heat exchange medium flowing through the third heat exchanger.

[0023] In one example, the heat source generating assembly further includes at least one ventilation device between the compression device and the first heat exchanger, the ventilation device being used to provide the process gas introduced through the first gas inlet to the first heat exchanger.

[0024] In one example, the shell also includes a clear liquid inlet arranged near the bottom of the purification and heat exchange tank and configured to replenish the second liquid heat exchange medium, and a waste liquid outlet arranged near the bottom of the purification and heat exchange tank and configured to discharge the second liquid heat exchange medium; when the second liquid heat exchange medium needs to be replenished, the second liquid heat exchange medium is introduced into the purification and heat exchange tank from the clear liquid inlet; when the purification and heat exchange tank needs to be cleaned, the second liquid heat exchange medium is discharged from the waste liquid outlet.

[0025] In one example, the shell further includes a compressed gas inlet disposed near the bottom of the purification and heat exchange box, and the purification and heat recovery component further includes a control valve and an injection pipe disposed near the bottom of the purification and heat exchange box and connected to the compressed gas inlet, the control valve being configured to introduce the compressed gas into the injection pipe via the compressed gas inlet when necessary, and to inject the compressed gas into the second liquid heat exchange medium of the purification and heat exchange box through a plurality of injection holes disposed on the injection pipe, and then be discharged together with the purified exhaust gas.

[0026] In one example, the second liquid heat exchange medium is one or more of water, cleaning liquid and ionic liquid.

[0027] In one example, the process gas is air.

[0028] 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:

[0029] Introducing the treated gas into the first space through the first gas inlet, exchanging heat with the first heat exchange medium flowing through the first heat exchanger, heating the treated gas to form heated treated gas, and discharging the heated treated gas through the first gas outlet for sludge treatment;

[0030] The waste gas after the sludge treatment is introduced into the first compartment through the second gas inlet, the waste gas is cleaned by the spraying liquid of the spraying device, and the heat in the waste gas is transferred to the spraying liquid, the spraying liquid is mixed with the second liquid heat exchange medium in the purification and heat exchange tank, and the heat is transferred to the second liquid heat exchange medium to be cooled, and the first heat exchange medium flowing through the second heat exchanger exchanges heat with the second liquid heat exchange medium in the purification and heat exchange tank, so that the heat of the second liquid heat exchange medium is transferred to the first heat exchange medium flowing through the second heat exchanger;

[0031] introducing the exhaust gas into the second compartment through the first gap to perform heat exchange with the first heat exchange medium flowing through the third heat exchanger; and

[0032] introducing the exhaust gas from the second compartment into the second liquid heat exchange medium in the purification and heat exchange tank to perform heat exchange with the second liquid heat exchange medium; and

[0033] The exhaust gas is introduced into the third compartment through the second gap, and is discharged from the third compartment or recycled.

[0034] Compared with a straight flow path, the curved flow path formed by the first vertical baffle and the second vertical baffle is conducive to achieving more complete heat exchange of the exhaust gas and improving the thermal efficiency of the system.

[0035] The spray device is provided with a plurality of spray holes, which not only facilitates flushing of the purification sphere of the purification device, but also can perform gas-liquid heat exchange with the exhaust gas through the spraying liquid, recover a part of the heat, and realize the functions of self-cleaning and heat recovery.

[0036] 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

[0037] At least one embodiment will be described below with reference to the following drawings, wherein like reference numerals represent like elements.

[0038] Figure 1 is a perspective view of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0039] Figure 2 is a cross-sectional view of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0040] Figure 3 FIG. 1 is a perspective view of a second space 14 of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0041] Figure 4 4 is a cross-sectional view of a second space 14 of an exemplary exhaust gas purification and heat recovery device according to the present invention.

[0042] Figure 5 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.

[0043] List of reference numerals:

[0044] A: Exhaust gas purification and heat recovery device;

[0045] B: Blowing device;

[0046] C: Sludge drying device;

[0047] D: Finished product silo device;

[0048] E: Finished product induced draft device;

[0049] F: Bag dust removal device;

[0050] G: induced draft device;

[0051] H: spray tower;

[0052] 1: Shell;

[0053] 1a: first end wall;

[0054] 1b: upper cover;

[0055] 1c: bottom plate;

[0056] 1d: second end wall;

[0057] 11: heat source generating component;

[0058] 111: first gas inlet;

[0059] 112: compression device;

[0060] 113: Ventilation device;

[0061] 114: first heat exchanger;

[0062] 115: first gas outlet;

[0063] 116: horizontal partition;

[0064] 12: Purification and heat recovery components;

[0065] 12c: Purification and heat exchange box;

[0066] 120: jet pipe;

[0067] 120a: first vertical partition;

[0068] 120b: second vertical partition;

[0069] 121: clear liquid inlet;

[0070] 122: second gas inlet;

[0071] 123: second heat exchanger;

[0072] 124: the third heat exchanger;

[0073] 125: second gas outlet;

[0074] 126: Waste liquid outlet;

[0075] 127: compressed gas inlet;

[0076] 128: Spraying device;

[0077] 129: at least one purification device;

[0078] 129a: upper separator;

[0079] 129b: lower screen;

[0080] 129c: Purification of the sphere;

[0081] 129d: ball hole;

[0082] 130a: first compartment;

[0083] 130b: Second compartment;

[0084] 130c: third compartment;

[0085] 2: Load;

[0086] 13: First Space;

[0087] 14: Second space;

[0088] 15: first gap;

[0089] 16: Second gap. DETAILED DESCRIPTION

[0090] 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.

[0091] With reference to the accompanying drawings, Figure 1 It is a stereoscopic diagram of a preferred embodiment of an exhaust gas purification and heat recovery device A according to the present invention. Figure 2 4 is a cross-sectional view of an exemplary exhaust gas purification and heat recovery device A according to the present invention. Figure 3 4 is a perspective view of a second space 14 of an exemplary exhaust gas purification and heat recovery device A according to the present invention. Figure 4 4 is a cross-sectional view of the second space 14 of an exemplary exhaust gas purification and heat recovery device A according to the present invention.

[0092] like Figure 1As shown, the vertical exhaust gas purification and heat recovery device A of the present invention includes a shell 1, a heat source generating assembly 11 and a purification and heat recovery assembly 12. The shell 1 includes an upper cover 1b, a bottom plate 1c, a horizontal partition 116, a first side wall (not shown, such as the front wall of the shell), a second side wall opposite to the first side wall (not shown, such as the rear wall of the shell), a first end wall 1a and a second end wall 1d opposite to the first end wall 1a, so as to define a first space 13 and a second space 14 separated by the horizontal partition 116. The upper cover 1b, the bottom plate 1c, the horizontal partition 116, the first side wall, the second side wall, the first end wall 1a and the second end wall 1d can be separate components. It should be understood that one or more of the upper cover 1b, the bottom plate 1c, the horizontal partition 116, the first side wall, the second side wall, the first end wall 1a and the second end wall 1d can also be formed as a whole without departing from the scope of the present invention. The housing 1 is provided with a first gas inlet 111 and a first gas outlet 115 communicating with the first space 13 , and a second gas inlet 122 and a second gas outlet 125 communicating with the second space 14 .

[0093] The heat source generating assembly 11 is disposed in the first space 13. The heat source generating assembly 11 includes at least one compression device 112 and at least one first heat exchanger 114.

[0094] The purification and heat recovery assembly 12 is arranged in the second space 14. The purification and heat recovery assembly 12 includes a purification and heat exchange box 12c, a second heat exchanger 123 arranged in the purification and heat exchange box 12c, a spray device 128, a first vertical partition 120a and a second vertical partition 120b. The first vertical partition 120a and the second vertical partition 120b divide the second space 14 into three compartments: a first compartment 130a, a second compartment 130b and a third compartment 130c. The second gas inlet 122 is connected to the first compartment 130a, the second gas outlet 125 is connected to the third compartment 130c, the spray device 128 is arranged in the first compartment 130a, and the second heat exchanger 123 is at least partially arranged in the second compartment 130b. According to one example, the second heat exchanger 123 is completely arranged in the second compartment 130b. It should be understood that a portion of the second heat exchanger 123 may also be disposed within the third compartment 130c.

[0095] like Figure 4 As shown, the first vertical partition 120a is fixed to the horizontal partition 116, and a first gap 15 is formed between the first vertical partition 120a and the upper cover 1b. The second vertical partition 120b is fixed to the upper cover 1b, and a second gap 16 is formed between the second vertical partition 120b and the horizontal partition 116.

[0096] like Figure 2As shown, the housing 1 defines a first space 13 and a second space 14 from bottom to top. The first space 13 and the second space 14 are separated by a horizontal partition 116. It should be understood that in addition to the first space 13 and the second space 14, the housing 1 may further define additional spaces without departing from the scope of the present invention.

[0097] The heat source generating assembly 11 may also include at least one ventilation device 113 between the compression device and the first heat exchanger for accelerating the transport of the process gas. It should be understood that the position of the compression device 112 can be changed, that is, the compression device 112 can also be arranged between at least one ventilation device 113 and the first heat exchanger without departing from the scope of the present invention. The first heat exchange medium circulates between at least one compression device 112, the first heat exchanger 114 and the second heat exchanger 123 via a heat exchange medium loop (not shown). For the sake of clarity, the various medium pipelines of the heat exchange medium loop are not shown. The heat exchange medium loop may include any suitable device, including a pipeline, a control valve and a check valve. The compression device 112 receives the first heat exchange medium, the first heat exchange medium is compressed in at least one compression device 112 to form a compressed first heat exchange medium, the compressed first heat exchange medium is guided to the first heat exchanger 114, and heat is exchanged with the process gas introduced into the first heat exchanger 114 via the first gas inlet 111, and the process gas is heated to form a heated process gas for load 2 (e.g., a sludge drying device). The heated process gas is discharged for sludge treatment via the first gas outlet 115. According to one example, after the heat exchange in the first heat exchanger, the first heat exchange medium becomes a liquid form.

[0098] The heated treated gas is discharged from the first gas outlet 115 and transported to the load 2 through the pipeline to dry the sludge. Since the first heat exchanger transfers the heat of the first heat exchange medium to the treated gas, the treated gas can quickly pass through the sludge to dry the sludge by utilizing the characteristics of fast flow and high energy transfer efficiency of the treated gas, thereby improving the efficiency of sludge drying and facilitating heat recovery. In one example of the present invention, Figure 1 and 2 As shown, the heat source generating assembly includes two compression devices 112 arranged one above the other. However, those skilled in the art should understand that the heat source generating assembly includes any number of compression devices 112, and the compression devices 112 can be arranged in any suitable manner, such as side by side, without departing from the scope of the present invention.

[0099] The purification and heat recovery assembly 12 is located above the heat source generating assembly 11 and is contained in the second space 14. The purification and heat exchange box 12c is defined by the horizontal partition 116, the upper portion of the first side wall, the upper portion of the second side wall, the upper portion of the first end wall 1a, and the upper portion of the second end wall 1d to contain the second liquid heat exchange medium 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 116 without departing from the scope of the present invention.

[0100] According to one example, the housing 1 further includes a clear liquid inlet 121 disposed near the bottom of the purification and heat exchange tank 12c and configured to replenish the second liquid heat exchange medium, and a waste liquid outlet 126 disposed near the bottom of the purification and heat exchange tank 12c and configured to discharge the second liquid heat exchange medium. When the second liquid heat exchange medium needs to be replenished, the second liquid heat exchange medium is introduced into the purification and heat exchange tank 12c from the clear liquid inlet. When the purification and heat exchange tank 12c needs to be cleaned, the second liquid heat exchange medium is discharged from the waste liquid outlet 126.

[0101] According to one example, the housing 1 further includes a compressed gas inlet 127 disposed near the bottom of the purification and heat exchange box 12c, and the purification and heat recovery assembly further includes a control valve (not shown) and an injection pipe 120 disposed near the bottom of the purification and heat exchange box 12c and communicating with the compressed gas inlet 127. The control valve is configured to introduce the compressed gas into the injection pipe 120 via the compressed gas inlet 127 when necessary, and inject it into the second liquid heat exchange medium of the purification and heat exchange box 12c through a plurality of injection holes disposed on the injection pipe 120, and then discharge it together with the purified exhaust gas.

[0102] According to an example, the second gas inlet 122 is located above the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank 12 c , and the second gas inlet 122 is located higher than the liquid inlet 121 .

[0103] The purification and heat recovery assembly 12 also includes at least one partition and at least one third heat exchanger 124. The at least one partition includes a first vertical partition 120a and a second vertical partition 120b. It should be understood that the purification and heat recovery assembly 12 may also include additional vertical partitions without departing from the scope of the present invention. The lower end of the first vertical partition 120a extends below the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank 12c. Figure 2As shown, the first vertical partition 120a is fixed to the horizontal partition 116, and the portion of the first vertical partition 120a below the liquid level may be provided with a plurality of through holes (not shown) to facilitate the flow of the second liquid heat exchange medium. According to one example, the lower end of the second vertical partition 120b is located above the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank 12c to allow gas to pass through. In another embodiment, the lower end of the second vertical partition is located below the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank 12c, but does not extend to the horizontal partition 116 to form a second gap 16 between the second vertical partition 120b and the horizontal partition 116. In addition, each of the first vertical partition and the second vertical partition is fixed to the first side wall and the second side wall.

[0104] According to one example, the first vertical partition 120a and the second vertical partition 120b are arranged in parallel and spaced apart by a certain distance, so that the first compartment 130a is located between the first vertical partition 120a and the second end wall 1d, the second compartment 130b is located between the first vertical partition 120a and the second vertical partition 120b, and the third compartment 130c is located between the second vertical partition 120b and the first end wall 1a 121. The first gas inlet 111 is arranged on the first end wall 1a, the first gas outlet 115 is arranged on the second end wall 1d, the second gas inlet 122 is arranged on the second end wall 1d, and the second gas outlet 125 is arranged on the first end wall 1a.

[0105] The first vertical baffle 120a and the second vertical baffle 120b can also be arranged at an angle of 90 degrees to each other, for example, the first vertical baffle 120a is rotated 90 degrees from the position shown in the figure, so that the first compartment 130a and the second compartment 130b are arranged along the lateral direction of the purification and heat recovery component 12. The first vertical baffle 120a and the second vertical baffle 120b can also be arranged in other ways without departing from the scope of the present invention. Similarly, the first gas inlet 111, the first gas outlet 115, the second gas inlet 122 and the second gas outlet 125 can be arranged at other suitable positions without departing from the scope of the present invention.

[0106] The waste gas after sludge treatment enters the first compartment through the second gas inlet 122, and the waste gas is cleaned by the spray liquid of the spray device 128, and the heat in the waste gas is transferred to the spray liquid. The spray liquid is mixed with the second liquid heat exchange medium in the purification and heat exchange tank 12c, and the heat is transferred to the second liquid heat exchange medium to be cooled. The first heat exchange medium flowing through the second heat exchanger exchanges heat with the second liquid heat exchange medium in the purification and heat exchange tank 12c, so that the heat of the second liquid heat exchange medium is transferred to the first heat exchange medium flowing through the second heat exchanger 123. Figure 2As shown by the arrows in FIG. 1 , the exhaust gas flows successively through the first compartment 130a, the first gap 15, the second compartment 130b, the second gap 16 and the third compartment 130c in a curved path. Compared with a straight flow path, the curved flow path formed by the first vertical partition 120a and the second vertical partition 120b is conducive to achieving more complete heat exchange of the exhaust gas and improving the thermal efficiency of the system.

[0107] The purification and heat recovery assembly 12 also includes at least one purification device 129 disposed in the first compartment. The purification device 129 is disposed above the second gas inlet 122, and a spray device 128 is disposed above the purification device 129 near the upper cover 1b. The spray device 128 is provided with a plurality of spray holes, which not only facilitates flushing of the purification sphere 129c of the purification device 129, but also can perform gas-liquid heat exchange with the exhaust gas by spraying liquid, recover a portion of the heat, and realize the functions of self-cleaning and heat recovery.

[0108] The waste gas after sludge drying is transported to the interior of the purification and heat recovery component through the second gas inlet 122. The waste gas is blocked by the first vertical partition 120a to be refracted upward, and passes through the purification device 129 to perform the first purification of the waste gas. At the same time, the liquid sprayed downward by the spray device 128 is washed with the waste gas flowing upward and the first heat recovery is performed, and the heat in the waste gas is transferred to the spray liquid. The spray liquid carrying heat passes through the purification device 129 and falls to the second liquid heat exchange medium in the purification and heat exchange box 12c, and the second liquid heat exchange medium then transfers the heat to at least one second heat exchanger 123. According to the example of the present invention, the spray liquid is the same liquid as the second liquid heat exchange medium.

[0109] At least one second heat exchanger 123 is arranged in the second compartment 130b, close to the horizontal partition 116 and below the liquid level of the second liquid heat exchange medium in the purification and heat exchange box 12c. At least one third heat exchanger 124 is arranged in the second compartment 130b and above the at least one second heat exchanger 123, and at least one third heat exchanger is arranged above the liquid level of the second liquid heat exchange medium in the purification and heat exchange box 12c. In addition, one end of the injection pipe 120 is connected to the compressed gas inlet 127, and the injection pipe 120 is provided with at least one injection hole. The gas after the first heat recovery passes through the opening between the top of the first vertical partition 120a and the cover 1b, and flows downward to at least one third heat exchanger 124 through the refraction of the second vertical partition 120b for the second heat recovery, thereby realizing heat exchange. Due to the obstruction of the first vertical partition 120a and the second vertical partition 120b, the gas after the second heat recovery flows downward into the second liquid heat exchange medium, and performs the third heat recovery with the second heat exchanger 123, thereby realizing multiple heat exchanges.

[0110] In another embodiment, the spray device 128 in the first compartment 130a may extend horizontally into the second compartment 130b, and a portion of the spray holes may be located above at least one third heat exchanger 124. The spray liquid that absorbs the heat of the exhaust gas may not only perform heat exchange with the third heat exchanger 124, but also clean the third heat exchanger 124 by the spray liquid, thereby preventing impurities in the exhaust gas from clogging the third heat exchanger 124 and affecting the heat recovery efficiency.

[0111] According to an example of the present invention, a purification device 129 may also be provided in the third compartment 130c. The position of the second gas outlet 125 is higher than the purification device 129. Due to the reason that the exhaust gas is continuously transported to generate air pressure, the gas passing through the second liquid heat exchange medium again leaves the liquid surface of the second liquid heat exchange medium in the purification and heat exchange box 12c upward and enters the third compartment 130c, and is purified again by the purification device 129. The purification sphere absorbs impurities and moisture in the exhaust gas, turning the exhaust gas into secondary purified gas, which is discharged from the second gas outlet 125. The secondary purified gas is transported to the first gas inlet 111 of the heat source generating assembly 11 through a pipeline to achieve gas recycling and zero emission. It should be understood that the secondary purified gas can also be directly discharged into the external environment without departing from the scope of the present invention.

[0112] The first heat exchange medium is connected in the first heat exchanger, the second heat exchanger and the third heat exchanger through a medium pipeline (not shown), and the heat recovered by the second heat exchanger and the third heat exchanger is transferred to the first heat exchanger through the first heat exchange medium to realize heat recovery. Through the first heat recovery of the waste gas and the spray liquid, the sludge impurities in the waste gas are cleaned and the heat is transferred to the spray liquid at the same time. The spray liquid is mixed with the second liquid heat exchange medium and then heat exchanged with the second heat exchanger, which can prevent the sludge impurities in the waste gas from corroding the second heat exchanger and improve the efficiency of heat recovery. In addition, the waste gas that has undergone the first heat recovery is heat exchanged with the third heat exchanger through a curved path to achieve full second heat recovery, and then the heat is transferred to the first heat exchanger through the first heat exchange medium to improve the heat supply efficiency of the first heat exchanger. The gas of the second heat recovery enters the second liquid heat exchange medium again, and heat exchanges with the second heat exchanger for the third heat recovery, realizing multiple heat exchanges and fully recovering the waste heat.

[0113] The second liquid heat exchange medium is water, but the second liquid heat exchange medium is not limited to water, and other suitable second liquid heat exchange mediums may also be used, such as cleaning liquid, ionic liquid, etc.

[0114] The purification device 129 includes an upper partition 129a and a lower partition 129b extending between the first vertical partition and the second end wall 1d, and a plurality of purification balls 129c held between the lower partition and the upper partition. Each purification ball 129c is provided with at least one ball hole 129d for absorbing impurities and moisture in the waste gas. When the waste gas rises to the purification device 129 after sludge treatment, the waste gas passes through the ball holes 129d between or in the plurality of purification balls 129c, and the purification balls 129c absorb impurities and moisture in the waste gas to turn the waste gas into a primary purified gas, and the primary purified gas automatically rises, while the spray liquid automatically falls to the purification device 129 to contact the waste gas, transferring the heat of the waste gas to the spray liquid.

[0115] An additional purification device 129 may also be provided in the third compartment 130. When the waste gas after secondary heat recovery rises from the third compartment 130c to the purification device 129, the waste gas passes through the plurality of purification spheres 129c or the ball holes 129d of the plurality of purification spheres, and the purification spheres 129c absorb impurities and moisture in the waste gas to turn the waste gas into secondary purified gas. The secondary purified gas can be transported from the second gas outlet 125 to the first gas inlet 111 of the heat source generating assembly 11 via an internal pipeline (not shown), so as to realize gas recycling.

[0116] According to an example of the present invention, for the flow path of the first heat exchange medium, the second heat exchanger 123 is arranged in series downstream of the third heat exchanger 124 (relative to the flow direction of the first heat exchange medium). However, the second heat exchanger 123 can also be arranged in series upstream of the third heat exchanger 124, for example, the third heat exchanger 124 is arranged in the third compartment. In addition, the second heat exchanger 123 can also be arranged in parallel with the third heat exchanger 126, and a part of it can be below the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank 12c, and the other part is above the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank 12c.

[0117] The compression device 112 compresses the first heat exchange medium in a gaseous state, and delivers the compressed high-temperature and high-pressure first heat exchange medium to the first heat exchanger 114. The first heat exchange medium is condensed in the first heat exchanger 114 by the process gas (such as air from the outside) flowing through the first heat exchanger 114, and becomes liquid, thereby heating the process gas.

[0118] According to one embodiment of the present invention, the first heat exchange medium after heat exchange in the first heat exchanger 114 enters the second heat exchanger 123 and / or the third heat exchanger 124 in a low-temperature and low-pressure liquid form through corresponding pipelines and control valves (not shown). According to one embodiment of the present invention, in the second heat exchanger 123 and / or the third heat exchanger 124, the first heat exchange medium absorbs heat to evaporate, and the evaporated first heat exchange medium is sucked into the compression device 112 to perform a new compression cycle. According to another embodiment of the present invention, in the second heat exchanger 123 and / or the third heat exchanger 124, the first heat exchange medium absorbs heat but is still in liquid form, and the first heat exchange medium in liquid form is sucked into the compression device 112 to perform a new compression cycle. The first heat exchange medium can be, for example, R134a, R407c, R410a, etc. It should be understood by those skilled in the art that the first heat exchanger 114, the second heat exchanger 123 and the third heat exchanger 124 can be any other suitable type of heat exchanger without departing from the scope of the present invention.

[0119] According to a preferred embodiment of the present invention, the process gas first flows outside the compression device 112 before flowing through the first heat exchanger 114, which helps cool the compression device 112 and is thus preheated, thereby improving the heat recovery efficiency.

[0120] In one embodiment of the present invention, load 2 is disposed downstream of the first heat exchanger 114, and is used to process the sludge and discharge the waste gas. A large amount of waste gas will be released during the sludge thermal drying process, and its composition is complex and diverse, and it is a mixture of various organic and inorganic gases. If it is directly discharged, it will cause serious secondary pollution to the surrounding environment and cause serious harm to the human living environment. In addition, since there is waste heat in the waste gas, direct discharge will cause heat loss. In one embodiment of the present invention, load 2 is a sludge drying device. It should be understood by those skilled in the art that load 2 can also be any other suitable type of sludge treatment device without departing from the scope of the present invention.

[0121] A plurality of second heat exchangers 123 can be arranged inside the purification and heat exchange box 12c as needed, and the plurality of second heat exchangers 124 can be arranged in series or in parallel, so as to improve the efficiency of transferring the heat of the second liquid heat exchange medium to the first heat exchange medium. The waste 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.

[0122] In one embodiment of the present invention, the second liquid heat exchange medium is water. However, the second liquid heat exchange medium is not limited to water, and other suitable liquids may also be used, such as cleaning liquid, ionic liquid, etc.

[0123] The secondary purified gas still carries a portion of heat, which can be circulated to the first gas inlet 111 for reuse, and further heat recovery is achieved. According to an example of the present invention, the secondary purified gas is guided back to the first space 13 through the first gas inlet 111 to recycle the process gas. Of course, as needed, the secondary purified gas can be discharged only to the environment or other processing devices (not shown) through the second gas outlet; alternatively, a portion of the secondary purified gas is guided back to the first heat exchanger 114 through the first gas inlet 111 to recycle the process gas, while another portion of the secondary purified gas is discharged via the second gas outlet. Any suitable device may be included, including a pipeline, a control valve, and a check valve.

[0124] The purification device 129 may also include a wire mesh demister, a packing demister, etc. In addition, multiple purification devices may be provided as required.

[0125] 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.

[0126] According to a preferred embodiment of the present invention, the purification and heat exchange tank 12c includes a clean liquid inlet 121 and a waste liquid outlet 126 disposed near the bottom of the purification and heat exchange tank 12c.

[0127] Since the waste gas contains sludge impurities, during the gas-liquid interaction in the purification and heat exchange box 12c, the sludge impurities in the waste gas are cleaned by the spraying liquid and mixed with the second liquid heat exchange medium, and retained in the second liquid heat exchange medium. In order to keep the second liquid heat exchange medium clean and ensure the efficiency of heat exchange, the second liquid heat exchange medium (such as water) is introduced into the purification and heat exchange box 12c from the clear liquid inlet 121 at the bottom of the purification and heat exchange box 12c.

[0128] As the sludge impurities in the liquid continue to increase, the second liquid heat exchange medium in the purification and heat exchange tank 12c becomes turbid, which in turn affects the heat exchange and cleaning of the waste gas entering later, and some devices also need to be repaired or replaced. To this end, the water intake can be stopped and the liquid can be discharged from the waste liquid outlet 126 at the bottom of the purification and heat exchange tank 12c. Afterwards, the reverse operation is performed to refill water into the purification and heat exchange tank 12c.

[0129] If too much sludge impurities accumulate at the bottom of the purification and heat exchange box 12c, affecting the heat exchange efficiency of the second heat exchanger 124, the compressed gas is transported from the compressed gas inlet 127 to the jet pipe arranged near the bottom of the purification and heat exchange box 12c. After that, the compressed gas is ejected through the multiple jet holes arranged on the jet pipe, and the sludge impurities at the bottom of the purification and heat exchange box 12c are stirred up to help the sludge impurities be discharged from the waste liquid outlet 126. The compressed gas leaving the second liquid heat exchange medium is automatically raised to the third compartment, and is discharged from the second gas outlet 125 together with the secondary purified gas, or is guided back to the compression device 112.

[0130] According to a preferred embodiment of the present invention, the second heat exchanger 123 is directly placed in the purification and heat exchange box 12c, thereby achieving sufficient heat exchange.

[0131] According to a preferred embodiment of the present invention, the process gas is air. However, the process gas may also be any other gas suitable for the present invention.

[0132] According to a preferred embodiment of the present invention, the treated gas is sent to the sludge treatment device from the first heat exchanger 114 by a ventilation device (not shown). The ventilation device is preferably a blower device B and / or an induced draft device.

[0133] Figure 5Schematic 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 second gas outlet 125 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.

[0134] Next, refer to Figure 1 and 2 The operation of the exhaust gas purification and heat recovery device of the present invention is described.

[0135] First, the liquid inlet of the purification and heat recovery assembly is opened by a control valve, and liquid is injected into the purification and heat exchange tank 12c from the liquid inlet. Under normal circumstances, the liquid will reach a predetermined liquid level in the purification and heat exchange tank 12c.

[0136] The treated gas is introduced into the first space 13 through the first gas inlet 111. The treated gas first flows through the compression device and then flows to the first heat exchanger 114. The first heat exchanger heats the gas to form heated treated gas. The heated treated gas is sent to the load 2 through the first gas outlet 115 by the ventilation device (such as a blower and / or an induced draft fan) to dry the sludge and generate waste gas with sludge impurities.

[0137] The waste gas after sludge treatment is introduced into the first compartment through the second gas inlet 122, and is refracted upward by the first vertical partition. The waste gas is cleaned by the spray liquid of the spray device 128, and the heat in the waste gas is transferred to the spray liquid. The spray liquid is mixed with the second liquid heat exchange medium in the purification and heat exchange tank 12c, and the heat is transferred to the second liquid heat exchange medium to be cooled. The first heat exchange medium flowing through the second heat exchanger exchanges heat with the second liquid heat exchange medium in the purification and heat exchange tank, so that the heat of the second liquid heat exchange medium is transferred to the first heat exchange medium flowing through the second heat exchanger.

[0138] The waste gas is introduced into the second compartment through the first gap 15, flows downward through the refraction of the second vertical partition, and exchanges heat with the first heat exchange medium flowing through the third heat exchanger. The waste gas is introduced from the second compartment into the second liquid heat exchange medium in the purification and heat exchange box to exchange heat with the second liquid heat exchange medium. The waste gas is introduced into the third compartment through the second gap 16, and is discharged or recycled from the third compartment. The secondary purified gas is transported to the first gas inlet through a pipeline to achieve gas recycling and zero emission.

[0139] At the same time, the compression device compresses the first heat exchange medium and discharges the compressed first heat exchange medium into the first heat exchanger. In the first heat exchanger, the first heat exchange medium releases heat to the gas flowing through the first heat exchanger to achieve heat exchange between the first heat exchange medium and the treated gas. Then, the condensed first heat exchange medium flows to the second heat exchanger and the third heat exchanger. As pointed out above, the first heat exchange medium in the purification and heat recovery assembly absorbs the heat in the exhaust gas, causing its temperature to rise. Therefore, the first heat exchange medium can absorb the heat in the exhaust gas and evaporate in the second heat exchanger, thereby reducing the temperature of the first heat exchange medium, so that it can continue to absorb the heat of the exhaust gas discharged therein. By converting the heat of the exhaust gas to the first heat exchange medium, and then transferring the heat energy to the treated gas by the first heat exchanger, multi-phase heat energy conversion is achieved, which greatly improves the transfer efficiency of heat energy. Through the heat conversion of the exhaust gas and the first heat exchange medium, heat can be fully recovered, heat loss can be reduced, and energy consumption can be reduced.

[0140] Since the waste gas carries some sludge impurities, when the purification and heat recovery component recovers the waste gas, the sludge impurities at the bottom accumulate too much, affecting the heat exchange efficiency of the second heat exchanger. The compressed gas can be transported from the compressed gas inlet to the jet pipe near the bottom of the purification and heat recovery component. After that, the compressed gas is ejected through the multiple jet holes set on the air pipe, and the sludge impurities at the bottom of the purification and heat recovery component are stirred up to help the sludge impurities be discharged from the waste liquid outlet 126.

[0141] As the sludge impurities in the liquid continue to increase, the second liquid heat exchange medium in the purification and heat recovery component becomes turbid, which in turn affects the heat exchange and cleaning of the waste gas entering later, and some devices also need to be repaired or replaced. Open the control valve to discharge the liquid from the waste liquid outlet of the purification and heat recovery component, and then perform the reverse operation to re-input liquid into the second liquid heat exchange medium inlet of the purification and heat recovery component.

[0142] 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), the shell (1) comprising an upper cover (1b), a bottom plate (1c), a horizontal partition (116), a first side wall, a second side wall opposite to the first side wall, a first end wall (1a) and a second end wall (1d) opposite to the first end wall (1a), and defining a first space (13) and a second space (14) separated by the horizontal partition (116), the shell (1) being provided with a first gas inlet (111) and a first gas outlet (115) communicating with the first space (13), and a second gas inlet (122) and a second gas outlet (125) communicating with the second space (14); a heat source generating assembly (11) accommodated in the first space (13), the heat source generating assembly (11) comprising at least one compression device (112) and at least one first heat exchanger (114); and A purification and heat recovery assembly (12) accommodated in the second space (14), the purification and heat recovery assembly (12) comprising a purification and heat exchange box (12c), a second heat exchanger (123) arranged in the purification and heat exchange box (12c), a spray device (128), a first vertical partition (120a) and a second vertical partition (120b), wherein the first vertical partition (120a) and the second vertical partition (120b) divide the second space (14) into three compartments: a first compartment (130a), a second compartment (130b) and a third compartment (130c), and a second gas inlet (122) The first compartment (130a) is connected to the second gas outlet (125) and is connected to the third compartment (130c). The spray device (128) is arranged in the first compartment (130a). The second heat exchanger (123) is at least partially arranged in the second compartment (130b). The first vertical partition (120a) is fixed to the horizontal partition (116), and a first gap (15) is formed between the first vertical partition (120a) and the upper cover (1b). The second vertical partition (120b) is fixed to the upper cover (1b), and a second gap (16) is formed between the second vertical partition (120b) and the horizontal partition (116). The first heat exchange medium circulates between at least one compression device (112), a first heat exchanger (114) and a second heat exchanger (123) via a heat exchange medium loop. The first heat exchange medium is compressed in the at least one compression device (112) to form a compressed first heat exchange medium. The compressed first heat exchange medium is introduced into the first heat exchanger (114) to perform heat exchange with the process gas introduced into the first heat exchanger (114) via the first gas inlet (111). The process gas is heated to form a heated process gas. The heated process gas is discharged via the first gas outlet (115) for sludge treatment. The waste gas after sludge treatment enters the first compartment through the second gas inlet (122), and the waste gas is cleaned by the spray liquid of the spray device (128), and the heat in the waste gas is transferred to the spray liquid. The spray liquid is mixed with the second liquid heat exchange medium in the purification and heat exchange box (12c), and the heat is transferred to the second liquid heat exchange medium to be cooled. The first heat exchange medium flowing through the second heat exchanger exchanges heat with the second liquid heat exchange medium in the purification and heat exchange box, so that the heat of the second liquid heat exchange medium is transferred to the first heat exchange medium flowing through the second heat exchanger. The waste gas flows through the first compartment (130a), the first gap (15), the second compartment (130b), the second gap (16) and the third compartment (130c) in a curved path.

2. The exhaust gas purification and heat recovery device (A) according to claim 1, wherein: The first vertical partition is arranged in parallel with the second vertical partition and is spaced a certain distance apart, so that the first compartment is located between the first vertical partition and the second end wall (1d), the second compartment is located between the first vertical partition and the second vertical partition, and the third compartment is located between the second vertical partition and the first end wall (1a), the first gas inlet (111) is arranged on the first end wall (1a), the first gas outlet (115) is arranged on the second end wall (1d), the second gas inlet (122) is arranged on the second end wall (1d), and the second gas outlet (125) is arranged on the first end wall (1a).

3. The exhaust gas purification and heat recovery device (A) according to claim 2, wherein: The purification and heat recovery assembly (12) further comprises at least one purification device (129) arranged in the first compartment, the purification device being located above the second gas inlet.

4. The exhaust gas purification and heat recovery device (A) according to claim 3, wherein: The spray device is located above the purification device and close to the upper cover, and the spray device is provided with a plurality of spray holes.

5. The exhaust gas purification and heat recovery device (A) according to claim 4, wherein: The spray device extends into the second compartment in the horizontal direction.

6. The exhaust gas purification and heat recovery device (A) according to claim 3, wherein: The purification device comprises an upper partition net (129a) and a lower partition net (129b) extending between a first vertical partition plate and a second end wall (1d), and a plurality of purification balls (129c) held between the lower partition net and the upper partition net, each purification ball being provided with at least one ball hole (129d) for absorbing impurities and moisture in the exhaust gas.

7. The exhaust gas purification and heat recovery device (A) according to claim 2, wherein: The first vertical partition and the second vertical partition are each fixed to the first side wall and the second side wall, and the lower end of the second vertical partition extends above the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank (12c).

8. The exhaust gas purification and heat recovery device (A) according to claim 2, wherein: The first vertical partition and the second vertical partition are each fixed to the first side wall and the second side wall, and the lower end of the second vertical partition extends below the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank (12c).

9. The exhaust gas purification and heat recovery device (A) according to claim 7 or 8, wherein: The first vertical partition is provided with a plurality of holes at a portion below the liquid level of the second liquid heat exchange medium in the purification and heat exchange tank (12c) to facilitate the flow of the second liquid heat exchange medium.

10. The exhaust gas purification and heat recovery device (A) according to claim 7 or 8, wherein: The purification and heat recovery component (12) further comprises a third heat exchanger arranged in the second compartment, and the purified exhaust gas flows through the third heat exchanger for heat exchange with the first heat exchange medium flowing through the third heat exchanger.

11. The exhaust gas purification and heat recovery device (A) according to claim 1, wherein: The heat source generating assembly further comprises at least one ventilation device (113) between the compression device and the first heat exchanger, wherein the ventilation device is used to provide the processing gas introduced through the first gas inlet to the first heat exchanger.

12. The exhaust gas purification and heat recovery device (A) according to claim 1, wherein: The shell also includes a clean liquid inlet (121) arranged near the bottom of the purification and heat exchange box and configured to supply a second liquid heat exchange medium, and a waste liquid outlet (126) arranged near the bottom of the purification and heat exchange box and configured to discharge the second liquid heat exchange medium; when the second liquid heat exchange medium needs to be replenished, the second liquid heat exchange medium is introduced into the purification and heat exchange box from the clean liquid inlet; when the purification and heat exchange box needs to be cleaned, the second liquid heat exchange medium is discharged from the waste liquid outlet.

13. The exhaust gas purification and heat recovery device (A) according to claim 12, wherein: The shell also includes a compressed gas inlet (127) arranged near the bottom of the purification and heat exchange box, and the purification and heat recovery component also includes a control valve and an injection pipe (120) arranged near the bottom of the purification and heat exchange box and connected to the compressed gas inlet (127). The control valve is configured to introduce compressed gas into the injection pipe through the compressed gas inlet when necessary, and inject it into the second liquid heat exchange medium of the purification and heat exchange box through a plurality of injection holes arranged on the injection pipe, and then discharge it together with the purified exhaust gas.

14. The exhaust gas purification and heat recovery device (A) according to claim 1, wherein: The second liquid heat exchange medium is one or more of water, cleaning liquid and ionic liquid.

15. The exhaust gas purification and heat recovery device (A) according to claim 1, wherein: The process gas is air.

16. 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 15, comprising: Introducing the treated gas into the first space (13) via the first gas inlet (111), exchanging heat with the first heat exchange medium flowing through the first heat exchanger, heating the treated gas to form heated treated gas, and discharging the heated treated gas via the first gas outlet (115) for sludge treatment; The waste gas after the sludge treatment is introduced into the first compartment through the second gas inlet (122), the waste gas is cleaned by the spraying liquid of the spraying device (128), and the heat in the waste gas is transferred to the spraying liquid, the spraying liquid is mixed with the second liquid heat exchange medium in the purification and heat exchange tank (12c), and the heat is transferred to the second liquid heat exchange medium to be cooled, and the first heat exchange medium flowing through the second heat exchanger exchanges heat with the second liquid heat exchange medium in the purification and heat exchange tank, so that the heat of the second liquid heat exchange medium is transferred to the first heat exchange medium flowing through the second heat exchanger; Introducing the exhaust gas into the second compartment through the first gap (15) to perform heat exchange with the first heat exchange medium flowing through the third heat exchanger; and Introducing the exhaust gas from the second compartment into the second liquid heat exchange medium in the purification and heat exchange tank to perform heat exchange with the second liquid heat exchange medium; as well as The exhaust gas is introduced into the third compartment through the second gap (16), and is discharged from the third compartment or recycled.

17. A sludge treatment system comprising: The exhaust gas purification and heat recovery device (A) according to any one of claims 1 to 15; 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).

18. The sludge treatment system according to claim 17 further includes a spray tower (H) fluidly connected to the second gas outlet (125) 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 energy recovery.

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