A sludge drying circulation structure and sludge drying system

Abstract

The invention provides a sludge drying circulation structure and a sludge drying system, a sludge drying circulation structure, which includes at least two-stage drying heating mechanisms, the first-stage drying heating mechanism introduces the hot and humid air generated by the drying of the sludge in the drying chamber through the first-stage heater and the heated gas is output by the fan, and the sludge on the upper crawler is preheated and dried, and the penetrating gas returns to the first-stage heater for a cycle process. The second-stage drying heating mechanism filters the hot and humid gas produced by the sludge in the drying chamber through air filters on both sides and heat exchanges through a total heat exchanger. The filtered and cooled gas is dehumidified by a condenser, and the generated dry gas is heated by the second-stage heater after being heated by the total heat exchanger, and the heated gas is output by the fan. The invention solves the problems of low waste heat utilization and high energy consumption in the process of low-temperature sludge drying.

Description

Technical Field

[0001] The invention belongs to the field of sludge drying, and in particular relates to a sludge drying circulation structure and a sludge drying system. Background Art

[0002] The necessary process in sewage treatment is sludge drying and dehydration. Among the common sludge drying and dehydration methods, the most environmentally friendly technology is low-temperature sludge drying technology, which uses electric energy to directly heat gas to dry sludge. However, the biggest problem with this technology is that it produces a lot of waste heat and the recovery rate is relatively low. Summary of the invention

[0003] In view of this, the present invention aims to propose a sludge drying circulation structure to solve the problems of low waste heat utilization and high energy consumption in the low-temperature sludge drying process.

[0004] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0005] A sludge drying circulation structure comprises at least two stages of drying and heating mechanisms, wherein the first stage drying and heating mechanism introduces external air or gas generated by sludge drying and then passes through a first stage heater and a fan outputs the heated gas;

[0006] The secondary drying and heating mechanism filters and cools the introduced external air or the gas generated by sludge drying through an air filter and a total heat exchanger respectively. The filtered and cooled gas is dried through a condenser, and then heated by a secondary heater after being heated through a total heat exchanger. The heated gas is output by a fan.

[0007] Furthermore, the gas output ends of the primary drying and heating mechanism and the secondary drying and heating mechanism are disposed one above the other.

[0008] Furthermore, the primary drying and heating mechanism and the two secondary drying and heating mechanisms are placed in coordination.

[0009] Further, the air filter includes a plate filter and / or a bag filter.

[0010] Furthermore, the fan input port in the first-level drying and heating mechanism is located in an isolation space, which is divided into two independent spaces by a first-level isolation plate, one of which is connected to the first-level heater and the fan input port in the first-level drying and heating mechanism, and the other is a second-level output isolation space, which is connected to the full heat exchanger and the second-level heater.

[0011] Furthermore, the plane where the first-stage isolation plate and the first-stage heater are connected forms an angle.

[0012] Furthermore, the planes where the primary isolation plate and the secondary heater are connected form an angle.

[0013] Furthermore, full heat exchangers with secondary drying and heating mechanisms are disposed on both sides of the isolation space, and each full heat exchanger is disposed in an exchange space, the exchange space is divided into a conversion space and a secondary output transition space, a drying space is disposed below the exchange space, and the drying space is divided into a secondary drying transition space and a condensation transition space by a secondary drying isolation plate, the upper and lower sides of the full heat exchanger are respectively connected to the air filter and the secondary drying transition space, the condenser is located in the condensation transition space, the condenser input end is connected to the secondary drying transition space, and its output end is connected to the secondary output transition space, and the left and right sides of the full heat exchanger are respectively connected to the secondary output transition space and the secondary output isolation space;

[0014] A secondary output space is provided below the isolation space, and the secondary output space is divided into two layers, the upper layer is provided with a secondary heater in the secondary drying and heating mechanism, and the lower layer is provided with a fan for outputting the gas of the secondary drying and heating mechanism, and each secondary drying and heating mechanism has a fan placed in an independent space, and the secondary heater is connected to the fan accordingly.

[0015] Furthermore, a portion of the secondary drying isolation plate adjacent to the total heat exchanger forms an angle with the top of the drying space.

[0016] Furthermore, the total heat exchanger is placed in the exchange space, the upper part of the exchange space is connected to the air filter, the lower part of the exchange space is connected to the secondary drying transition space, and one side of the secondary drying transition space is connected to the condenser.

[0017] Furthermore, the condenser is connected to the total heat exchanger through the secondary output transition space.

[0018] Furthermore, the secondary output transition space and the exchange space are formed by isolation of the same space.

[0019] A sludge drying system with a sludge drying cycle structure is used to solve the problem of improving the heat utilization rate and accelerating the drying speed during the entire low-temperature sludge drying process.

[0020] A sludge drying system using a sludge drying circulation structure, comprising a sludge drying conveying pipeline, a sludge drying output pipeline, a sludge drying heating mechanism, a sludge drying input mesh belt and a sludge drying output mesh belt;

[0021] Two or more sludge drying and heating mechanisms are placed side by side and form a sludge drying and heating system with the sludge drying passage space. The sludge drying input mesh belt and the sludge drying output mesh belt are both placed in the sludge drying passage space, and an output port of a primary drying and heating mechanism fan is sandwiched between the sludge drying input mesh belt and the sludge drying output mesh belt, and an output port of a secondary drying and heating mechanism fan is located below the sludge drying output mesh belt.

[0022] A sludge drying output mesh belt is arranged below the output end of the sludge drying input mesh belt;

[0023] The outlet of the sludge drying conveying pipeline is connected to the input end of the sludge drying input mesh belt, and the output end of the sludge drying output mesh belt is connected to the sludge drying output pipeline through the output channel;

[0024] The inlet of the sludge drying conveying pipeline is located below the inlet of the sludge drying output pipeline.

[0025] Furthermore, the outlet of the sludge drying conveying pipeline and the inlet of the sludge drying output pipeline are partially in a flat channel state.

[0026] Furthermore, the output pipeline is connected to the sludge drying output pipeline through an output auger.

[0027] Furthermore, the sludge drying input mesh belt is located beside the sludge drying heating mechanism.

[0028] Furthermore, the sludge drying and heating system is externally covered with a machine casing.

[0029] Furthermore, the outlet of the sludge drying conveying pipeline is connected to the input end of the sludge drying input mesh belt through a strip cutter.

[0030] Compared with the prior art, the sludge drying circulation structure and sludge drying system created by the present invention have the following advantages:

[0031] (1) The sludge drying cycle structure of the present invention is reasonably and concisely arranged, which can meet the heating and drying requirements at two levels. At the same time, according to the changes in the usage rules of hot gas, a structure mode of direct heating and indirect waste gas utilization is established, which effectively solves the problem of low energy utilization rate of waste gas filtration technology currently available on the market.

[0032] (2) The sludge drying system described in the present invention designs the sludge input and output structure, and through the distribution of the conveying and output mesh belts, effectively cooperates with the sludge drying circulation structure to accelerate the efficiency of sludge drying. According to the required amount of sludge to be dried, multiple sludge drying circulation structures can be arranged and established to increase the flexibility of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0034] Figure 1 This is a schematic diagram of the overall structure of the sludge drying system according to an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the sludge drying cycle structure according to an embodiment of the present invention;

[0036] Figure 3 This is a three-dimensional diagram of the sludge drying cycle structure described in the embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1-sludge storage tank; 2-sludge drying conveying pipeline; 3-sludge drying output pipeline; 4-strip cutter; 51-output channel; 52-output auger; 6-sludge drying input mesh belt; 7-sludge drying output mesh belt; 81-first-stage heater; 82-first-stage isolation plate; 83-plate filter; 84-bag filter; 85-full heat exchanger; 86-second-stage output transition space; 87-second-stage drying transition space; 871-second-stage drying isolation plate; 88-condenser; 89-second-stage heater; 810-circulating fan; 811-second-stage output isolation space; 9-pipe support; 10-machine casing. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0042] like Figure 1 As shown, a sludge drying system using a sludge drying circulation structure includes a sludge drying conveying pipeline 2, a sludge drying output pipeline 4, a sludge drying heating mechanism 8, a sludge drying input mesh belt 6 and a sludge drying output mesh belt 7;

[0043] Two or more sludge drying and heating mechanisms 8 are placed side by side and form a sludge drying and heating system with the sludge drying passage space. The sludge drying input mesh belt 6 and the sludge drying output mesh belt 7 are both placed in the sludge drying passage space, and an output port of a circulating fan 810 is sandwiched between the sludge drying input mesh belt 6 and the sludge drying output mesh belt 7. The output port of a main fan 89 is located below the sludge drying output mesh belt 7.

[0044] The outlet of the sludge drying conveying pipeline 2 is connected to the input end of the sludge drying input mesh belt 6 through the input channel 4, and the output end of the sludge drying output mesh belt 7 is connected to the sludge drying output pipeline 3 through the output channel 51;

[0045] A sludge drying output mesh belt 7 is arranged below the output end of the sludge drying input mesh belt 6; the sludge output through the sludge drying conveying pipeline 2 can gradually move in the sludge drying heating system through the sludge drying input mesh belt 6, and after being dried once by the hot air blown out by the fan in the primary sludge drying heating mechanism, it falls onto the sludge drying output mesh belt 7 to continue to be dried again. The hot air used for this drying is the hot air after the waste gas recycling. After the hot air passes through the dust filtration of the air filter, it is cooled by the total heat exchanger 85, and then the moisture in the gas is removed by condensation of the condenser 88, and then the moisture is heated by the total heat exchanger 85 again, and finally heated by the secondary heater 89, and finally the dried and heated gas is output to the sludge on the sludge drying output mesh belt 7 through the fan for drying.

[0046] The inlet of the sludge drying and conveying pipeline 2 is located below the inlet of the sludge drying output pipeline 3 .

[0047] The outlet of the sludge drying and conveying pipeline 2 and the inlet of the sludge drying output pipeline 3 are in a flat channel state.

[0048] The output pipeline 51 is connected to the sludge drying output pipeline 3 through the output auger 52 .

[0049] The sludge drying input mesh belt 6 is located beside the plate filter 81 .

[0050] The sludge drying and heating system is externally covered with a machine housing 10 .

[0051] like Figure 2 and Figure 3 As shown, the sludge drying cycle structure includes at least two stages of drying and heating mechanisms. The first stage drying and heating mechanism introduces external air or gas generated by sludge drying, and then passes through the first stage heater 81 and the fan outputs the heated gas;

[0052] The secondary drying and heating mechanism introduces external air (this external air can be the air in the entire sludge drying system because the entire sludge drying cycle structure is wrapped by the machine casing 10 and is in a closed space. At this time, the external air is the air generated by the sludge drying process) or the gas generated by the sludge drying is filtered and cooled through the air filter and the total heat exchanger 85 respectively. The filtered and cooled gas is dried by the condenser 88, and then heated by the total heat exchanger 85 and heated by the secondary heater 89. The heated gas is output by the fan.

[0053] The gas output ends of the primary drying and heating mechanism and the secondary drying and heating mechanism are arranged one above the other.

[0054] The placement positions of the primary drying and heating mechanism and two or more secondary drying and heating mechanisms may also be coordinated, such as being placed up and down, left and right, or staggered in space.

[0055] The air filter includes a plate filter 83 and / or a bag filter 84. Of course, the main purpose of the air filter is to remove dust and impurities, so a gas filter can also be used to achieve this purpose.

[0056] The following embodiment provides a sludge drying cycle structure that rationally utilizes space and minimizes space occupancy:

[0057] The fan input port in the first-level drying and heating mechanism is located in an isolation space, which is divided into two independent spaces by a first-level isolation plate 82. One is connected to the first-level heater 81 and the fan input port in the first-level drying and heating mechanism, and the other is a second-level output isolation space, which is connected to the full heat exchanger 85 and the second-level heater 89.

[0058] The plane where the primary isolation plate 82 and the primary heater 81 are connected is at an angle. The plane where the primary isolation plate 82 and the secondary heater 89 are connected is at an angle. The two angles are mainly set to allow the gas to flow through better.

[0059] Full heat exchangers 85 with secondary drying and heating mechanisms are arranged on both sides of the isolation space, and each full heat exchanger 85 is placed in an exchange space, the exchange space is divided into a conversion space and a secondary output transition space 86, a drying space is arranged below the exchange space, and the drying space is divided into a secondary drying transition space 87 and a condensation transition space by a secondary drying isolation plate 871, the upper and lower sides of the full heat exchanger 85 are respectively connected to the air filter and the secondary drying transition space 87, the condenser 88 is located in the condensation transition space, the input end of the condenser 88 is connected to the secondary drying transition space 87, and the output end thereof is connected to the secondary output transition space 86, and the left and right sides of the full heat exchanger 85 are respectively connected to the secondary output transition space 86 and the secondary output isolation space 811;

[0060] A secondary output space is provided below the isolation space, and the secondary output space is divided into two layers, the upper layer is provided with the secondary heater 89 in the secondary drying and heating mechanism, and the lower layer is provided with a fan for outputting the gas of the secondary drying and heating mechanism, which fan can be called a circulating fan 810, and each secondary drying and heating mechanism has a fan placed in an independent space, and the secondary heater 89 is connected to the fan accordingly.

[0061] The portion of the secondary drying isolation plate 871 adjacent to the total heat exchanger 85 forms an angle with the top of the drying space.

[0062] The total heat exchanger 85 is placed in the exchange space, the upper part of the exchange space is connected to the air filter, the lower part of the exchange space is connected to the secondary drying transition space 87, and one side of the secondary drying transition space 87 is connected to the condenser 88.

[0063] The condenser 88 is connected to the total heat exchanger 85 through the secondary output transition space 86 .

[0064] The secondary output transition space 86 and the exchange space are formed by isolation from the same space.

[0065] The connectivity between the spaces enables the waste gas utilization mode of the entire circulation structure to be well realized, effectively integrating the heating of the original air and the heating of the waste gas in a large space, thereby improving space utilization.

[0066] The primary heater 81 and the secondary heater 89 both obtain heat through the hot water supply pipe.

[0067] The water inlet and outlet of the hot water supply pipes of the primary heater 81 and the secondary heater 89 are both one, and the water inlet and outlet are placed side by side. The direction and arrangement of the hot water supply pipes can reduce energy consumption.

[0068] Since the sludge drying and heating system in the sludge drying system is covered by the machine housing 10, normal air enters the sludge drying and heating mechanism from above;

[0069] The waste gas after heating and drying the sludge enters the sludge drying heating mechanism through the top of the sludge drying heating system. Since the waste gas carries moisture and waste in the sludge, the secondary heated gas first passes through the plate filter 83 and the bag filter 84 to remove impurities, and then passes through the heat regulation of the total heat exchanger 85 and the condenser 88 to remove the moisture of the waste gas, and then the temperature is adjusted again and the secondary heater 89 is used, so that the gas is heated, and finally sent to the bottom of the sludge drying output mesh belt 7 through the fan 810.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sludge drying circulation structure, characterized in that: At least two-stage drying and heating mechanism, the first-stage drying and heating mechanism introduces external air or gas generated by sludge drying, and then passes through the first-stage heater and the fan outputs the heated gas; The secondary drying and heating mechanism filters and cools the introduced external air or the gas generated by sludge drying through the air filter and the total heat exchanger respectively. The filtered and cooled gas is dried through the condenser, and then heated by the secondary heater after being heated through the total heat exchanger. The heated gas is output by the fan. The fan input port in the primary drying and heating mechanism is located in an isolation space, which is divided into two independent spaces by a primary isolation plate, one of which is connected to the primary heater and the fan input port in the primary drying and heating mechanism, and the other is a secondary output isolation space, which is connected to the total heat exchanger and the secondary heater; Full heat exchangers with secondary drying and heating mechanisms are arranged on both sides of the isolation space, and each full heat exchanger is placed in an exchange space, the exchange space is divided into a conversion space and a secondary output transition space, a drying space is arranged below the exchange space, and the drying space is divided into a secondary drying transition space and a condensation transition space by a secondary drying isolation plate, the upper and lower sides of the full heat exchanger are respectively connected to the air filter and the secondary drying transition space, the condenser is located in the condensation transition space, the condenser input end is connected to the secondary drying transition space, and its output end is connected to the secondary output transition space, and the left and right sides of the full heat exchanger are respectively connected to the secondary output transition space and the secondary output isolation space; A secondary output space is provided below the isolation space, and the secondary output space is divided into an upper and lower layer, the upper layer is provided with a secondary heater in the secondary drying and heating mechanism, and the lower layer is provided with a fan for outputting gas from the secondary drying and heating mechanism, and each secondary drying and heating mechanism has a fan placed in an independent space, and the secondary heater is connected to the fan accordingly; The gas output ends of the primary drying and heating mechanism and the secondary drying and heating mechanism are arranged one above the other.

2. A sludge drying circulation structure according to claim 1, characterized in that: The primary drying and heating mechanism and the two secondary drying and heating mechanisms are placed in coordination.

3. A sludge drying circulation structure according to claim 1, characterized in that: The air filter includes a plate filter and / or a bag filter.

4. A sludge drying circulation structure according to claim 1, characterized in that: The plane where the primary isolation plate and the primary heater are connected forms an angle; or, The planes where the primary isolation plate and the secondary heater are connected form an angle.

5. The sludge drying circulation structure according to claim 1 is characterized by: The total heat exchanger is placed in the exchange space, the upper part of the exchange space is connected to the air filter, the lower part of the exchange space is connected to the secondary drying transition space, and one side of the secondary drying transition space is connected to the condenser.

6. A sludge drying system using the sludge drying circulation structure of claim 1, characterized in that: It includes a sludge drying conveying pipeline, a sludge drying output pipeline, a sludge drying heating mechanism, a sludge drying input mesh belt and a sludge drying output mesh belt; Two or more sludge drying and heating mechanisms are placed side by side and form a sludge drying and heating system with the sludge drying passage space. The sludge drying input mesh belt and the sludge drying output mesh belt are both placed in the sludge drying passage space, and an output port of a circulating fan is sandwiched between the sludge drying input mesh belt and the sludge drying output mesh belt. The main fan output port is located below the sludge drying output mesh belt. A sludge drying output mesh belt is arranged below the output end of the sludge drying input mesh belt; The outlet of the sludge drying conveying pipeline is connected to the input end of the sludge drying input mesh belt through the input channel, and the output end of the sludge drying output mesh belt is connected to the sludge drying output pipeline through the output channel; The inlet of the sludge drying conveying pipeline is located below the inlet of the sludge drying output pipeline.

7. A sludge drying system according to claim 6, characterized in that: The outlet of the sludge drying conveying pipeline and the inlet of the sludge drying output pipeline are in a flat channel state.

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