Waste heat collection and utilization system for digester system

Abstract

The utility model relates to the fields of atmospheric pollution prevention and control, resource recycling industry and the like in advanced environmental protection industry, in particular to a waste heat collection and utilization system for a digester system. In the utility model, the digester system comprises a digester body, an air inlet of the digestion dust remover is connected to the dust steam outlet of the digester body, and an air outlet of the digestion dust remover is connected to the exhaust pipe; the waste heat collection and utilization system comprises a heat collection water tank filled with water; the first waste heat collecting mechanism is used for introducing waste heat of the digester body into the heat collecting water tank; the second waste heat collecting mechanism is used for introducing waste heat of the exhaust pipe into the heat collecting water tank; a water inlet and a water outlet of the hot water utilization mechanism are connected to the heat collection water tank. Waste heat generated in the digestion reaction process is comprehensively utilized, the problems of heating in winter of a factory, hot water utilization of other production lines and the like are solved, and meanwhile waste heat utilization controllability is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to advanced environmental protection industry in the air pollution prevention and control, resource recycling industry etc. BACKGROUND

[0002] Calcium hydroxide is an inorganic compound, commonly known as slaked lime or lime. Calcium hydroxide is a strong base with bactericidal and preservative ability, which has corrosive effect on skin and fabric. Calcium hydroxide is used to manufacture bleaching powder, water softener, disinfectant and insecticide, unhairing agent for leather making, sugar refining and building materials, etc.

[0003] In the traditional industrial production process, when calcium oxide (commonly known as "quicklime") is put into the digestion device and reacts with water, it will undergo a violent heat release process. Calcium oxide reacts with water to form calcium hydroxide, and this reaction releases a large amount of heat, because the reaction of calcium oxide with water is a strong hygroscopic and exothermic reaction, and the generated heat will be dissipated to the environment through the dust collector system connected to the digester, on the one hand causing air pollution, and on the other hand causing a certain degree of energy loss and resource waste. SUMMARY

[0004] I. Technical problems to be solved

[0005] The utility model expects to at least partially solve one of the above technical problems.

[0006] II. Technical solutions

[0007] The utility model provides a kind of waste heat collection and utilization system for digester system. Digester system includes: digester body;Digestion dust collector, its air inlet is connected to the dust steam outlet of digester body, its air outlet is connected to exhaust pipe;The waste heat collection and utilization system of the utility model includes: heat collection water tank, its inside is filled with water;First waste heat collection mechanism, the waste heat of digester body is introduced into heat collection water tank;Second waste heat collection mechanism, the waste heat of exhaust pipe is introduced into heat collection water tank;Hot water utilization mechanism, its water inlet and water outlet are connected to heat collection water tank.

[0008] In some embodiments of the utility model, the digester body is a quicklime digester body;And / or, the digester body is: digestion tank or digestion box.

[0009] In some embodiments of the utility model, heat collection water tank is columnar structure, its horizontal section is consistent with the bottom surface of digester body;Heat collection water tank is arranged in the lower part of digester body.

[0010] In some embodiments of the utility model, first waste heat collection mechanism is communicated with heat collection water tank.

[0011] In some embodiments of the utility model, first waste heat collection mechanism is closed fluid heat exchange system, including: first heat absorption structure and first heat release structure that set up respectively in digester body and heat collection water tank, two intercommunication and two inside heat exchange fluid and water in heat collection water tank are isolated;

[0012] In some embodiments of the utility model, second waste heat collection mechanism is linked with heat collection water tank.

[0013] In some embodiments of the utility model, second waste heat collection mechanism is closed fluid heat exchange system, including: second heat absorption structure and second heat release structure that set up respectively in exhaust pipe and heat collection water tank, two intercommunication but two inside heat exchange fluid and water in heat collection water tank are isolated.

[0014] In some embodiments of the utility model, still include: control mechanism, its control signal output end is connected to the control end of first waste heat collection mechanism and / or second waste heat collection mechanism.

[0015] In some embodiments of the utility model, first waste heat collection mechanism is linked with heat collection water tank;First waste heat collection mechanism includes: disc type heat exchange pipe, set up in digester body, its water inlet and water outlet are linked with first water outlet and first backwater port of heat collection water tank through pipeline respectively;First circulating water pump, set up in the pipeline between disc type heat exchange pipe and heat collection water tank;First regulating valve group, set up in the pipeline between disc type heat exchange pipe and heat collection water tank.

[0016] In some embodiments of the utility model, disc type heat exchange pipe is: digester jacket cooling pipe.

[0017] In some embodiments of the utility model, the extension direction of disc type heat exchange pipe is parallel with the extension direction of digester stirring shaft.

[0018] In some embodiments of the utility model, digester body is rectangular parallelepiped digestion tank, and the stirring shaft is arranged along the horizontal direction, and the disc type heat exchange pipe is arranged close to the front wall and / or rear wall and / or upper wall and / or lower wall of the internal chamber of the digester body;Or, the digester body is cylindrical digestion tank, and the stirring shaft is arranged along the vertical direction, and the disc type heat exchange pipe is arranged close to the side wall of the internal chamber of the digester body.

[0019] In some embodiments of the utility model, second waste heat collection mechanism and heat collection water tank are communicated, the digester system further includes: digestion dust removal fan, its air inlet is communicated to the air outlet of digestion dust remover, its air outlet is communicated to exhaust pipe, second waste heat collection mechanism includes: tubular heat exchanger, is arranged on exhaust pipe, its water inlet and water outlet are connected to the second water outlet and second backwater of heat collection water tank through pipeline respectively, second circulating water pump is arranged in the pipeline between tubular heat exchanger and heat collection water tank, second regulating valve group is arranged in the pipeline between tubular heat exchanger and heat collection water tank.

[0020] In some embodiments of the utility model, first regulating valve group and second regulating valve group are electric control regulating valve group, the waste heat collection and utilization system further includes: water temperature sensor, is arranged in heat collection water tank, control mechanism, its water temperature signal input end is connected to water temperature sensor, and its two water temperature control signal output ends are connected to the control end of first regulating valve group and second regulating valve group respectively.

[0021] In some embodiments of the utility model, the water inlet pipe of heat collection water tank is connected to water source through pipeline, and electric control water replenishing valve is arranged in the pipeline between heat collection water tank and water source, the drain pipe of heat collection water tank is connected to production water tank through pipeline, and electric control water draining valve is arranged in the pipeline between heat collection water tank and production water tank, the waste heat collection and utilization system further includes: water level sensor and air pressure sensor, arranged in heat collection water tank, control mechanism, its water amount signal input end is connected to water level sensor, its air pressure signal input end is connected to air pressure sensor, and its two water level control signal output ends are connected to electric control water replenishing valve and electric control water draining valve respectively.

[0022] In some embodiments of the utility model, hot water utilization mechanism includes: winter heating system, including: N groups of radiators arranged in series or in parallel, and the water inlet and water outlet of the winter heating system are communicated to the third water outlet and third backwater of heat collection water tank respectively, and heating valve group is arranged in the pipeline between winter heating system and heat collection water tank, and N≥1.

[0023] In some embodiments of the utility model, hot water utilization mechanism includes: second production line requiring hot water supply.

[0024] Three, beneficial effects

[0025] From the above technical scheme, the utility model has at least one of the following beneficial effects relative to the prior art:

[0026] 1. The utility model utilizes the waste heat generated in the digestion reaction process comprehensively, solves the problems of plant winter heating, hot water utilization of other production lines, etc., and realizes controllability of waste heat utilization.

[0027] 2. The utility model sets up water level sensor and barometric pressure sensor, combines corresponding valve and control logic, can realize the safe, reliable operation of waste heat collection and utilization system. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is structure schematic drawing of waste heat collection and utilization system of the utility model embodiment for digester system.

[0029] Figure 2A And Figure 2B Respectively Figure 1 It is the front view and left view of the digester body.

[0030] Figure 3 It is the schematic diagram of control mechanism signal connection relation in the utility model waste heat collection and utilization system. DETAILED DESCRIPTION

[0031] The utility model's conception lies in: all -round use the waste heat produced in the digestive reaction process, solves the heating of factory area in winter, other production line hot water utilization etc. problem, realizes controllable of waste heat utilization.

[0032] In order to make the purpose, technical scheme and advantage of the utility model more clear and clear, below combining specific embodiment, and referring to the drawings, the utility model is further detailed.

[0033] The utility model provides a kind of waste heat collection and utilization system for digester system. In the following embodiment, mainly take quicklime digester as example to explain. But the person skilled in the art should understand, for other types of existence digestive reaction exothermic digester, same can apply the utility model, same in the protection scope of the utility model.

[0034] Figure 1 It is structure schematic drawing of waste heat collection and utilization system of the utility model embodiment for digester system. Figure 2A And Figure 2B Respectively Figure 1 As shown in, in the embodiment, digester system 10 includes: Figure 1

[0035] Digester body 11;

[0036] Digestion dust collector 12, its air inlet is connected to the dust steam outlet of digester body;

[0037] Digestion dust fan 13, its air inlet is communicated to the air outlet of digestion dust collector, and its air outlet is communicated to exhaust pipe 14.

[0038] ​It should be appreciated by those skilled in the art that some digestive systems do not have a digestive dust removal fan. In this case, the air outlet of the digestive dust removal device is directly connected to the atmosphere through the exhaust pipe, and the utility model can also be achieved.

[0039] In this embodiment, the digestive device body 11 is a double-shaft digestive device and has a cuboid shape. The right motor 11A outputs torque, which is output to the digestive cavity through the reduction box 11B, the gear set 11C, and the bearing. For the motor 11A, the reduction box 11B, the gear set 11C, and the bearing, please refer to the relevant description of the prior art, which will not be described here.

[0040] Please continue to refer to Figure 1 In this embodiment, the waste heat collection and utilization system 20 includes: a heat collection water tank 21, which is filled with water; a first waste heat collection mechanism, which introduces the waste heat of the digestive device body into the heat collection water tank; a second waste heat collection mechanism, which introduces the waste heat of the exhaust pipe into the heat collection water tank; a hot water utilization mechanism, whose water inlet and outlet are connected to the heat collection water tank; and a control mechanism, whose control signal output end is connected to the control end of the first waste heat collection mechanism and / or the second waste heat collection mechanism.

[0041] It should be particularly noted that the feature of this embodiment is that the control mechanism controls the first waste heat collection mechanism and / or the second waste heat collection mechanism. If the required heat is high, both waste heat collection mechanisms are used. If the required heat is low, one or both waste heat collection mechanisms can be closed, and the waste heat utilization is adjusted according to the demand, which will be further described below.

[0042] Please refer to Figure 1 、 Figure 2A 、 Figure 2B The digestive device body 11 is a digestive tank and has a cuboid shape. The stirring shaft is arranged in the horizontal direction. In some other embodiments of the utility model, the digestive device body is a digestive tank and has a cylindrical shape, and the stirring shaft is arranged in the vertical direction.

[0043] Please refer to Figure 1 、 Figure 2A 、 Figure 2B In this embodiment, the heat collection water tank 21 has a cuboid shape and is arranged at the lower part of the digestive device body 11, and its horizontal cross section is consistent with the bottom surface of the digestive device body. In this way, the heat collection water tank 21 and the digestive device body 11 are more compact, and the volume utilization rate is higher.

[0044] In other embodiments of the present application, the digester body can be of other shapes, in which case, the horizontal cross section of the water collecting tank can be consistent with the bottom surface of the digester body. For example, the digester body is a digestion tank, and the water collecting tank is in the shape of a cylinder consistent with the bottom surface of the digestion tank. These variations can also achieve the present application and are within the scope of the present application.

[0045] Please continue to refer to Figure 1 In this embodiment, the first waste heat collecting mechanism is in communication with the water collecting tank, that is, the liquid in the first waste heat collecting mechanism and the water collecting tank is in communication. The first waste heat collecting mechanism comprises:

[0046] The disc type heat exchange pipe 22A is arranged in the digester body, and the water inlet and the water outlet thereof are connected to the first water outlet and the first backwater inlet of the water collecting tank through pipelines;

[0047] The first circulating water pump 22B is arranged in the pipeline between the disc type heat exchange pipe and the water collecting tank;

[0048] The first regulating valve group 22C is arranged in the pipeline between the disc type heat exchange pipe and the water collecting tank.

[0049] For the cuboid-shaped digester body, the disc type heat exchange pipe is arranged close to the front wall and / or rear wall and / or upper wall and / or lower wall of the internal chamber of the digester body. In some cases, the existing digester jacket cooling pipe can be used as the disc type heat exchange pipe in the present application. Specifically, in this embodiment, the disc type heat exchange pipe 22A is arranged close to the front wall and the rear wall of the internal chamber of the digester body. The advantages of such arrangement are high waste heat collection efficiency, convenient installation and maintenance.

[0050] Under the digester body in the form of a digestion tank, the disc type heat exchange pipe is arranged close to the side wall of the internal chamber of the digester body. This variation can also achieve the present application and is within the scope of the present application.

[0051] In this embodiment, the first regulating valve group 22C is an electrically controlled regulating valve, which will be conducive to automatic control by the subsequent control mechanism. This part will be further described later, and will not be repeated here.

[0052] In this embodiment, the first regulating valve group 22C comprises two regulating valves respectively arranged on the water inlet pipeline and the backwater pipeline of the disc type heat exchange pipe. In this case, closing the two regulating valves will completely close the liquid flow in the first waste heat collecting mechanism, which is conducive to control by the control mechanism and facilitates troubleshooting and maintenance. However, the present application is not limited thereto. In other embodiments of the present application, a regulating valve can also be arranged only on the water inlet pipeline or the backwater pipeline, which can also achieve the present application, but the controllability and maintenance convenience are poorer.

[0053] It should be particularly pointed out that the first waste heat collection mechanism and the liquid in the heat collection water tank are communicated with each other in the embodiment, and the advantages of such a setting are simple structure and low cost. However, the first waste heat collection mechanism can also be a closed fluid heat exchange system. At this time, the first waste heat collection mechanism comprises: a first heat absorption structure and a first heat release structure arranged in the digester body and the heat collection water tank respectively, and the two are communicated with each other and the heat exchange fluid inside the two is isolated from the water in the heat collection water tank.

[0054] Please continue to refer to Figure 1 In the embodiment, the second waste heat collection mechanism is communicated with the heat collection water tank, that is, the second waste heat collection mechanism and the liquid in the heat collection water tank are communicated with each other. The second waste heat collection mechanism comprises:

[0055] The tubular heat exchanger 23A is arranged on the exhaust pipe, and the water inlet and the water outlet thereof are connected to the second water outlet and the second water return port of the heat collection water tank through pipelines respectively;

[0056] The second circulating water pump 23B is arranged in the pipeline between the tubular heat exchanger and the heat collection water tank;

[0057] The second adjusting valve group 23C is arranged in the pipeline between the tubular heat exchanger and the heat collection water tank.

[0058] Similar to the first waste heat collection mechanism, in the embodiment, the second adjusting valve group 23C is an electric control valve group, which comprises two adjusting valves. The deformation mode of the second adjusting valve group 22C is the same as that of the first adjusting valve group, which will not be described here.

[0059] It should be particularly pointed out that the second waste heat collection mechanism and the liquid in the heat collection water tank are communicated with each other in the embodiment, and the advantages of such a setting are simple structure and low cost. However, the second waste heat collection mechanism can also be a closed fluid heat exchange system. At this time, the second waste heat collection mechanism is a closed fluid heat exchange system, comprising: a second heat absorption structure and a second heat release structure arranged in the exhaust pipe and the heat collection water tank respectively, and the two are communicated with each other but the heat exchange fluid inside the two is isolated from the water in the heat collection water tank.

[0060] Those skilled in the art should understand that the water in the heat collection water tank decreases with consumption. In this case, the water inlet pipe of the heat collection water tank 21 is connected to a water source through a pipeline, and a water replenishing valve 21A is arranged in the pipeline between the heat collection water tank and the water source; the water outlet pipe of the heat collection water tank is connected to a production water tank through a pipeline, and a water draining valve 21B is arranged in the pipeline between the heat collection water tank and the production water tank.

[0061] In this embodiment, the hot water utilization mechanism includes a winter heating system and a second production line. The winter heating system includes N sets of radiators 31 connected in series, where N≥1. The inlet and outlet of the winter heating system are respectively connected to the third outlet and the third return outlet of the hot water collection tank; a heating valve group 32 and a circulating water pump 33 are installed in the pipeline between the winter heating system and the hot water collection tank. In winter, fresh water enters the hot water collection tank 21 through the inlet pipe, and after being heated by the heat from the digester body 11 and the exhaust pipe 14, the hot water at an appropriate temperature enters the radiators 31 for heating the factory office area. In summer, the inlet valve of the heating system is closed, and the heated water is used for other production lines that require hot water.

[0062] Those skilled in the art should understand that although the N groups of heat sinks are connected in series in this embodiment, the heat sinks can also be connected in parallel in other embodiments of this utility model, which can also achieve this utility model and are also within the protection scope of this utility model.

[0063] Please continue to refer to Figure 1 The hot water collection tank also includes a water temperature sensor 21C, a water level sensor 21D, and a gas pressure sensor 21E, all of which are located inside the hot water collection tank. The first regulating valve group 22C and the second regulating valve 23C are both electrically controlled regulating valves. In addition, the water supply valve 21A and the water drain valve 21B are also electrically controlled regulating valves.

[0064] Figure 3 This is a schematic diagram showing the signal connection relationship of the control mechanism in the waste heat collection and utilization system of this utility model. (See diagram for example.) Figure 3 As shown, the control mechanism is a PLC remote control mechanism. Its sensor signal input side has three sensor signal input terminals, which receive signal outputs from the water temperature sensor, water level sensor, and air pressure sensor, respectively. Its control signal output side has four control signal output terminals, which are respectively connected to the control terminals of the first regulating valve group, the second regulating valve group, the water supply valve, and the water drain valve.

[0065] The control mechanism is used to execute: water temperature control logic, water level control logic, and air pressure control logic.

[0066] I. Water Temperature Control Logic

[0067] The water temperature signal input terminal of the control mechanism is connected to the water temperature sensor, and its two water temperature control signal output terminals are respectively connected to the control terminals of the first regulating valve group and the second regulating valve group.

[0068] Under normal circumstances, both the first and second regulating valve groups are open. In this state, the water in the hot water collection tank is heated by the heat from the digester body and the exhaust pipe.

[0069] When the water temperature detected by the water temperature sensor exceeds the preset high temperature threshold, the first regulating valve group and / or the second regulating valve group are selected to be closed, reducing the heat supply of the heat collection tank, thereby reducing the water temperature in the heat collection tank. Of course, if the water temperature is lower than the preset low temperature threshold, the first regulating valve group and the second regulating valve group will be opened.

[0070] II. Water quantity control logic

[0071] The water quantity signal input end of the control mechanism is connected to the water level sensor, and its two water level control signal output ends are connected to the water replenishing valve and the water draining valve, respectively.

[0072] Under normal circumstances, the water replenishing valve and the water draining valve are both in a closed state. In this case, the water quantity in the heat collection tank remains unchanged.

[0073] When the water level detected by the water level sensor is lower than the preset low water level threshold, the control opens the water replenishing valve to fill fresh water into the heat collection tank. When the water level detected by the water level sensor reaches the preset normal water level, the water replenishing valve is closed.

[0074] When the water level detected by the water level sensor is higher than the preset high water level threshold, the water draining valve is opened to drain the water in the heat collection tank. When the water level detected by the water level sensor reaches the preset normal water level, the water draining valve is closed.

[0075] III. Air pressure control logic

[0076] If the digester fails, it may cause the heat collection tank to be heated uncontrollably, and if not handled, it may cause the heat collection tank to explode, causing damage to the instrument, or even causing personnel casualties.

[0077] The air pressure signal input end of the control mechanism is connected to the air pressure sensor, and the air pressure in the heat collection tank is discharged through the water draining valve.

[0078] When the air pressure in the heat collection tank detected by the air pressure sensor is higher than the preset high pressure threshold, the control sends out an alarm sound and light signal, and at the same time opens the water draining valve to discharge the hot water and steam in the heat collection tank to the outside, ensuring production safety.

[0079] The working process of the waste heat collection and utilization system of the embodiment is introduced as follows:

[0080] (1) Heat collection

[0081] The bottom of the digester body is provided with a heat collection water tank 21 for storing heated water. A coil heat exchanger 22A is arranged inside the digester body 11, water is passed through the coil heat exchanger 22A, and the heat generated by the digestion reaction is used to heat the water in the pipeline, and an electrically controlled first regulating valve group 22C is arranged on the pipeline. The digestion dust collector 12 is arranged on the top of the digester body 11, and a tubular heat exchanger 23A is arranged on the exhaust pipe 14 of the dust removal fan 13, which uses hot steam to heat the water in the pipe, and an electrically controlled second regulating valve group 23C is arranged on the pipeline.

[0082] (2) System control

[0083] The control mechanism adopts PLC remote control, the opening degree of the electric first regulating valve and the second regulating valve is controlled by reading the water temperature, and if the temperature is too high, the waste heat collection mechanism of one of the two can be closed. A water level sensor is arranged in the heat collection water tank 21, and the water tank can be automatically replenished.

[0084] (3) Hot water utilization

[0085] Fresh water enters the heat collection water tank through the water inlet pipe, the first circulating water pump 22B in the first waste heat collection mechanism and the second circulating water pump 23B in the second waste heat collection mechanism are opened, and the heated water enters the radiator for heating in the office area of the factory, and in summer, the heating system is closed, and the heated water is used for other production lines that need hot water.

[0086] By now, the various embodiments of the utility model have been introduced. According to the above description, those skilled in the art should have a clear understanding of the utility model.

[0087] The ordinal numbers used in the specification and claims, such as "first", "second", "third", Arabic numerals, letters, etc. are used to modify the corresponding elements, and the original intention is only to distinguish one element with a certain name from another element with the same name, and does not mean that the element has any ordinal number.

[0088] It should be noted that the direction terms mentioned in the embodiments, such as "center", "transverse", "longitudinal", "top", "bottom", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. And throughout the drawings, the same elements are represented by the same or similar reference numerals. And the shapes and sizes of the components in the drawings do not reflect the true size and ratio, but only illustrate the content of the embodiments of the utility model.

[0089] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "connect", "connection" should be broad sense understanding, for example, can be fixed connection, can also be detachable connection, or integral connection, can be direct connection, can also be indirectly connected through the intermediate medium, can be two elements inside the communication. For ordinary skilled person in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0090] The skilled person in the art should understand that in the utility model claims and the specification, the word "comprising" does not exclude the presence of elements not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of more than one such element.

[0091] For some implementations, if it is not the key content of the utility model, and is well known to ordinary skilled person in the art, due to the limitation of the length, it is not described in detail in the drawings or text of the specification, at this time, it can be understood by referring to the related prior art.

[0092] And, the purpose of providing the above embodiment is only to make the utility model meet the legal requirements, and the utility model can be realized in many different forms, and should not be interpreted as being limited to the embodiments described herein.

[0093] Similarly, it should be understood that, in order to simplify the utility model, in the above description of the exemplary embodiments of the utility model, various features of the utility model are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the utility model should not be interpreted as reflecting the intention that the claimed utility model requires more features than the features explicitly recited in each claim. More precisely, as reflected in the claims, each aspect of the utility model is based on less than all the features of the preceding single embodiment. And, the embodiments can be mixed and used with each other or other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments. Therefore, the claims following the specific embodiments are hereby expressly incorporated into the specific embodiments, wherein each claim itself is a separate embodiment of the utility model.

[0094] The above various specific embodiments, the purpose, technical means and beneficial effects of the utility model are described in detail, it should be understood that the purpose of detailed description is to enable those skilled in the art to understand the utility model more clearly, and is not used to limit the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A waste heat collection and utilization system for a digestor system, characterized in that, the digestor system comprises: a digestor body; a dust removal device, whose air inlet is connected to the dust steam outlet of the digestor body, and whose air outlet is connected to an exhaust pipe; the waste heat collection and utilization system comprises: a water collection tank, which is filled with water; a first waste heat collection mechanism, which introduces the waste heat of the digestor body into the water collection tank; a second waste heat collection mechanism, which introduces the waste heat of the exhaust pipe into the water collection tank; a hot water utilization mechanism, whose water inlet and outlet are connected to the water collection tank.

2. The waste heat collection and utilization system according to claim 1, characterized in that, the digestor body is a quicklime digestor body; and / or, the digestor body is a digesting tank or a digesting box; and / or, the water collection tank has a columnar structure, whose horizontal cross section is consistent with the bottom surface of the digestor body; the water collection tank is arranged at the lower part of the digestor body.

3. The waste heat collection and utilization system according to claim 1, characterized in that, the first waste heat collection mechanism is in communication with the water collection tank; or, the first waste heat collection mechanism is a closed fluid heat exchange system, which comprises: a first heat absorption structure and a first heat release structure arranged in the digestor body and the water collection tank respectively, and the two are in communication with each other and the heat exchange fluid in the two is isolated from the water in the water collection tank; and / or, the second waste heat collection mechanism is in communication with the water collection tank; or, the second waste heat collection mechanism is a closed fluid heat exchange system, which comprises: a second heat absorption structure and a second heat release structure arranged in the exhaust pipe and the water collection tank respectively, and the two are in communication with each other but the heat exchange fluid in the two is isolated from the water in the water collection tank.

4. The waste heat recovery utilization system according to claim 1, characterized by Further comprising: a control mechanism, whose control signal output end is connected to the control end of the first waste heat collection mechanism and / or the second waste heat collection mechanism.

5. The waste heat recovery utilization system according to claim 4, characterized by the first waste heat collection mechanism is in communication with the water collection tank; the first waste heat collection mechanism comprises: a disc type heat exchange pipe, which is arranged in the digestor body, and whose water inlet and outlet are connected to the first water outlet and the first backwater outlet of the water collection tank through pipelines respectively; a first circulating water pump, which is arranged in the pipeline between the disc type heat exchange pipe and the water collection tank; a first adjusting valve group, which is arranged in the pipeline between the disc type heat exchange pipe and the water collection tank.

6. The waste heat collection and utilization system according to claim 5, characterized in that, the disc type heat exchange pipe is a digestor jacket cooling pipe; and / or, the extension direction of the disc type heat exchange pipe is parallel to the extension direction of the digestor stirring shaft; and / or, the digestor body is a rectangular box-shaped digesting box, whose stirring shaft is arranged along the horizontal direction, and the disc type heat exchange pipe is arranged close to the front wall and / or the back wall and / or the upper wall and / or the lower wall of the internal chamber of the digestor body; or, the digestor body is a cylindrical-shaped digesting tank, whose stirring shaft is arranged along the vertical direction, and the disc type heat exchange pipe is arranged close to the side wall of the internal chamber of the digestor body.

7. The waste heat recovery utilization system according to claim 5, characterized by the second waste heat collection mechanism is in communication with the water collection tank; The digester system further comprises a digestion dust-removing fan, an air inlet of which is communicated with an air outlet of the digestion dust-removing device, and an air outlet of which is communicated with the exhaust pipe; The second waste heat collecting mechanism comprises: A tubular heat exchanger is arranged on the exhaust pipe, and a water inlet and a water outlet of the tubular heat exchanger are connected to a second water outlet and a second water return of a heat collection water tank through pipelines respectively; A second circulating water pump is arranged in the pipeline between the tubular heat exchanger and the heat collection water tank; A second adjusting valve group is arranged in the pipeline between the tubular heat exchanger and the heat collection water tank.

8. The waste heat collecting and utilizing system according to claim 7, wherein, Both the first adjusting valve group and the second adjusting valve group are electrically controlled adjusting valve groups; The waste heat collecting and utilizing system further comprises a water temperature sensor arranged in the heat collection water tank; The control mechanism has a water temperature signal input end connected to the water temperature sensor, and two water temperature control signal output ends connected to control ends of the first adjusting valve group and the second adjusting valve group respectively.

9. The waste heat collecting and utilizing system according to claim 8, wherein, A water inlet pipe of the heat collection water tank is connected to a water source through a pipeline, and an electrically controlled water supplement valve is arranged in the pipeline between the heat collection water tank and the water source; A drain pipe of the heat collection water tank is connected to a production water tank through a pipeline, and an electrically controlled water discharge valve is arranged in the pipeline between the heat collection water tank and the production water tank; The waste heat collecting and utilizing system further comprises a water level sensor and an air pressure sensor arranged in the heat collection water tank; The control mechanism has a water amount signal input end connected to the water level sensor, an air pressure signal input end connected to the air pressure sensor, and two water level control signal output ends connected to the electrically controlled water supplement valve and the electrically controlled water discharge valve respectively.

10. The waste heat recovery utilization system according to any one of claims 1 to 9, characterized by, The hot water utilizing mechanism comprises: A winter heating system comprising N groups of radiators arranged in series or in parallel, a water inlet and a water outlet of the winter heating system being communicated with a third water outlet and a third water return of the heat collection water tank respectively, and a heating valve group being arranged in the pipeline between the winter heating system and the heat collection water tank, wherein N≥1; And / or a second production line requiring hot water supply.

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