Sludge spray drying device and sludge vaporization drying method

Abstract

The present application relates to a kind of sludge spray drying device and sludge vaporization drying method, belong to sludge treatment technical field, solve the problem of low sludge vaporization drying efficiency.The present application includes: sludge pump pipe, spray drying furnace, atomizer and heating device being set on sludge pump pipe and spray drying furnace;Sludge pump pipe is set in the upper of spray drying furnace and penetrates spray drying furnace, the end of sludge pump pipe is connected atomizer;Atomizer is used to atomize sludge and spray into the inner chamber of spray drying furnace;Heating device heats, vaporization and drying to sludge in sludge pump pipe and spray drying furnace.The present application uses heat conducting oil to preheat sludge and realizes flash evaporation in spray form, improves the efficiency and drying degree of sludge vaporization drying.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment, and particularly relates to a sludge spray drying device and a sludge gasification drying method. BACKGROUND

[0002] The sludge represented by municipal sewage sludge has a high water content (about 72% after mechanical dewatering), a low calorific value (200-400 kCal / kg), occupies space for landfill treatment, is difficult to maintain in the later period, easily blocks the drainage system, and has a high maintenance cost; at present, a relatively complete treatment method is incineration.

[0003] The sludge after mechanical dewatering has a too low calorific value, and it is difficult to reach the lower limit of the calorific value (generally 800-1200 kCal / kg) required for normal combustion of solid fuel, so it needs to be dried and dewatered to improve the calorific value. The existing sludge drying technology has a low drying efficiency, and the water content in the sludge after drying cannot be sufficiently reduced, which affects the subsequent incineration effect.

[0004] Therefore, in order to improve the efficiency of sludge drying and the effect of drying and dewatering, the present application provides a sludge spray drying device and a gasification drying method. SUMMARY

[0005] In view of the above analysis, the present application aims to provide a sludge spray drying device and a sludge gasification drying method to solve the problem of low calorific value of sludge after drying due to insufficient drying of the existing sludge.

[0006] The purpose of the present application is mainly realized through the following technical solutions:

[0007] A sludge spray drying device, comprising: a sludge pump pipe, a spray drying furnace, a sprayer, and a heating device arranged on the sludge pump pipe and the spray drying furnace; the sludge pump pipe is arranged above the spray drying furnace and penetrates the spray drying furnace, and the end of the sludge pump pipe is connected to the sprayer; the sprayer is used for atomizing and spraying the sludge into the inner cavity of the spray drying furnace; and the heating device is used for heating the sludge pump pipe and the spray drying furnace.

[0008] The heating device comprises: a first heat-conducting oil pipe and a second heat-conducting oil pipe; the first heat-conducting oil pipe is arranged outside the sludge pump pipe; the second heat-conducting oil pipe is arranged on the inner wall of the cavity of the spray drying furnace; and the first heat-conducting oil pipe and the second heat-conducting oil pipe are both filled with heat-conducting oil.

[0009] Further, the first heat-conducting oil pipe and the second heat-conducting oil pipe are both arranged on the sludge pump pipe or the spray drying furnace in a spiral winding manner; the heat-conducting oil flows through the gasification incineration furnace, and thus the heat generated by the gasification incineration of the sludge can be transmitted to the sludge pump pipe and the spray drying furnace.

[0010] Further, the sprayer is a conical structure; the upper end of the sprayer is connected with the sludge pump pipe, and the lower end is provided with a conical horn; a plurality of third high-pressure air inlets are arranged outside the horn; the third high-pressure air inlets are used for blowing high-pressure gas into the horn cavity, so that the sludge can be sprayed into the sludge spray drying furnace in a spray state.

[0011] Further, the plurality of third high-pressure air inlets are arranged in an equidistant array in the circumferential direction outside the horn of the sprayer, and the plurality of third high-pressure air inlets are located at the same height.

[0012] Further, the angle between the blowing direction of the third high-pressure air inlet and the radial direction of the sprayer is α; 5°≤α≤30°.

[0013] Further, the first heat-conducting oil pipe is connected with a first electromagnetic valve and a first oil pump; the first electromagnetic valve is used for adjusting the flow of the heat-conducting oil in the first heat-conducting oil pipe; and the first oil pump is used for controlling the flow rate of the heat-conducting oil in the first heat-conducting oil pipe.

[0014] Further, the second heat-conducting oil pipe is connected with a second electromagnetic valve and a second oil pump; the second electromagnetic valve is used for adjusting the flow of the heat-conducting oil in the second heat-conducting oil pipe; and the second oil pump is used for controlling the flow rate of the heat-conducting oil in the second heat-conducting oil pipe.

[0015] Further, the lower end of the sludge spray drying furnace is provided with a first air inlet pipe, and the upper end is provided with an air outlet pipe; the first air inlet pipe is used for bottom blowing hot air; and the air outlet pipe is used for discharging the gas after the sludge is vaporized and dried.

[0016] A sludge vaporization and drying method, which adopts the sludge spray drying device to vaporize and dry the sludge to be treated.

[0017] A sludge vaporization and drying incineration integrated treatment system, which comprises the sludge spray drying device.

[0018] The technical scheme of the present application can at least achieve one of the following effects:

[0019] 1. The sludge spray drying device of the present application adopts heat-conducting oil to absorb the heat generated by incineration to heat the sludge in the sludge pump pipe, so that the sludge has a higher temperature before being sprayed and dried, and the sludge is heated and pressurized in the sludge pump pipe to be preheated; after being pressurized and preheated, part of the water in the sludge is vaporized to make the internal structure of the sludge loose, improve the atomization and injection effect of the sprayer, and further improve the vaporization and drying effect, which is beneficial to significantly improving the calorific value of the sludge before entering the gasification and incineration furnace, so that the subsequent incineration is more complete and thorough, and the efficiency of sludge treatment is improved.

[0020] 2. The sludge spray drying device of the present application, the sprayer uses multi-channel high-pressure air to rotate and extrude the internal air, so that it realizes atomization injection, and the sludge can be sprayed into the spray drying furnace in an umbrella-shaped effect, promoting heat exchange with the bottom blowing hot air of the spray drying furnace; the present application sprays the sludge into the atomization vaporization drying furnace in the form of atomization explosion, so that it can quickly dry and dry the sludge in the atomized state sprayed into the furnace, improve the sludge drying efficiency, the drying effect is good, and the removed moisture after drying is more, which is beneficial to reduce the energy consumption of the subsequent incineration process.

[0021] 3. The sludge spray drying device of the present application, the heat conducting oil is used to heat and warm the spray drying furnace, maintain the temperature in the spray drying furnace, so that the cavity space always keeps high temperature state, realizes the flash evaporation of the sprayed sludge, improves the gasification effect of the later incineration, makes up for the shortage of low heat value of the sludge (even after drying), further improves the heat value (temperature) of the dried sludge to promote its combustion effect, improves the sludge treatment efficiency and saves the cost.

[0022] In the present application, the above technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. The purpose and other advantages of the present application can be realized and obtained from the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the embodiments, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain the principles of the application, and should not be considered limiting of the present application in scope, as numerous embodiments can be made of the application.

[0024] Figure 1 It is a structure schematic view of the sludge spray drying device of the present application embodiment 1.

[0025] Figure 2 It is a structure schematic view of the sludge pump pipe and atomizer of the sludge spray drying device of the present application embodiment 1.

[0026] Figure 3 It is a cross-sectional view of the atomizer of the sludge spray drying device of the present application embodiment 1.

[0027] Figure 4 It is a structure schematic view of the condenser of the sludge spray drying device of the present application embodiment 1.

[0028] Figure 5 It is a flow chart of the sludge vaporization drying method of the present application embodiment 2.

[0029] Figure 6The structure and component diagram of the gasification incinerator and the waste heat boiler of the sludge gasification drying incineration integrated treatment system of embodiment 3 of the present application;

[0030] Figure 7 The preheating pipe arrangement diagram of the air preheater of embodiment 3;

[0031] Figure 8 The structure diagram of the preheating pipe of embodiment 3.

[0032] Reference signs:

[0033] 1 - feeding groove; 2 - feeder; 3 - sludge pump pipe; 4 - first heat conducting oil pipe; 5 - spray drying furnace; 6 - sprayer; 601 - first high pressure air inlet; 602 - second high pressure air inlet; 603 - third high pressure air inlet; 7 - second heat conducting oil pipe; 8 - air outlet pipe; 9 - first oil inlet interface; 10 - first oil outlet interface; 11 - material guide pipe; 12 - first air inlet pipe; 13 - auger conveyor; 14 - driving motor; 15 first electromagnetic valve; 16 - first oil pump; 17 - air bellow; 18 - condensing pipe; 19 - condensing pipe air inlet interface; 20 - condensing pipe air outlet interface; 21 - liquid discharge interface; 22 - heat exchange air pipe; 23 - air distribution plate; 24 - air distribution board; 25 - first flue gas chamber; 26 - second flue gas chamber; 27 - communication chamber; 28 - second oil inlet interface; 29 - second oil outlet interface; 30 - gasification incinerator; 31 - second air inlet pipe; 32 - water inlet interface; 33 - water outlet interface; 34 - waste heat boiler; 35 - first gas preheater; 36 - second gas preheater; 37 - dust outlet; 38 - flue gas outlet. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of the present application and serve to explain the principles of the present application together with the embodiments of the present application, but are not used to limit the scope of the present application.

[0035] Embodiment 1

[0036] One specific embodiment of the present application discloses a sludge spray drying device, such as Figure 1 , Figure 2As shown, it comprises: a sludge pump pipe 3, a spray drying furnace 5, a sprayer 6 and a heating device arranged on the sludge pump pipe 3 and the spray drying furnace 5; the sludge pump pipe 3 is arranged above and penetrates through the spray drying furnace 5, and the end of the sludge pump pipe 3 is connected to the sprayer 6; the sprayer 6 is used to spray sludge into the inner cavity of the spray drying furnace 5; the heating device comprises: a first heat-conducting oil pipe 4 and a second heat-conducting oil pipe 7; the first heat-conducting oil pipe 4 is arranged outside the sludge pump pipe 3; the second heat-conducting oil pipe 7 is arranged on the inner wall of the cavity of the spray drying furnace 5; both the first heat-conducting oil pipe 4 and the second heat-conducting oil pipe 7 are filled with heat-conducting oil.

[0037] Specifically, the first heat-conducting oil pipe 4 and the second heat-conducting oil pipe 7 are both arranged in a spiral coil on the sludge pump pipe 3 or the spray drying furnace 5; the heat-conducting oil flows through the gasification incinerator, thereby being able to transfer the heat generated by the gasification incineration of the sludge to the sludge pump pipe 3 and the spray drying furnace 5.

[0038] Specifically, as shown in the drawings, Figure 1 , Figure 2 the outside of the sludge pump pipe 3 is provided with the first heat-conducting oil pipe 4, and the first heat-conducting oil pipe 4 is arranged in multiple groups on the sludge pump pipe 3; the multiple groups of first heat-conducting oil pipes 4 are arranged outside the sludge pump pipe 3, and are used to preheat the sludge in the sludge pump pipe 3. The first heat-conducting oil pipe 4 is in communication with the heat-conducting oil pipe outside the gasification incinerator 30; and then the first heat-conducting oil pipe 4 preheats the sludge pump pipe 3 and the sludge inside it by the heat-conducting oil flowing inside. The sludge in the sludge pump pipe 3 is heated by the heat-conducting oil (300-380℃) in the first heat-conducting oil pipe 4; and after heating, the temperature of the sludge reaches above 110℃.

[0039] Further, the upper end of the sludge pump pipe 3 is communicated with the feeding chute 1, and the sludge enters the sludge pump pipe 3 through the feeding chute 1; and a feeder 2 is arranged between the sludge pump pipe 3 and the feeding chute 1, and the feeder 2 is used to guide the sludge into the sludge pump pipe 3. Preferably, the feeder 2 is a double-spiral feeder.

[0040] Further, multiple temperature sensors are arranged on the first heat-conducting oil pipe 4, and the preheating state of the sludge in the sludge pump pipe 3 is determined by taking the average of multiple temperature values measured by the temperature sensors.

[0041] Further, a first electromagnetic valve 15 and a first oil pump 16 are arranged between the first heat-conducting oil pipe 4 and the heat-conducting oil pipe outside the gasification incinerator 30, the flow of the heat-conducting oil in the first heat-conducting oil pipe 4 is adjusted by the first electromagnetic valve 15, and the flow rate of the heat-conducting oil is controlled by the first oil pump 16, thereby realizing temperature control of the heat-conducting oil.

[0042] Further, a sludge pump is arranged on the sludge pump pipe 3, and is used to control the speed of the sludge guided into the spray drying furnace 5.

[0043] In one embodiment of the present application, the wet sludge in the sludge pump pipe 3 is sprayed into the spray drying furnace 5 by the sprayer 6. Figure 2 、 Figure 3 The sprayer 6 in the present application is in the shape of a cone.

[0044] Specifically, the upper end of the sprayer 6 is connected to the lower end of the sludge pump pipe 3. The lower end of the sprayer 6 has a conical horn mouth, and the horn mouth is in communication with the sludge pump pipe 3 through the connecting pipe at the upper end of the sprayer 6.

[0045] As shown in Figure 2 、 Figure 3 , the upper end of the sprayer 6 is connected to the first high-pressure air inlet 601 and the second high-pressure air inlet 602; specifically, the first high-pressure air inlet 601 and the second high-pressure air inlet 602 are both in communication with the connecting pipe at the upper end of the sprayer 6, and are symmetrically arranged on both sides of the connecting pipe.

[0046] Further, as shown in Figure 2 、 Figure 3 , the outer side of the conical horn mouth at the lower end of the sprayer 6 is provided with a plurality of third high-pressure air inlets 603.

[0047] Specifically, the plurality of third high-pressure air inlets 603 are arranged in an equidistant array in the circumferential direction outside the horn mouth of the sprayer 6, and the plurality of third high-pressure air inlets 603 are located at the same height, as shown in Figure 3 .

[0048] Preferably, the number of third high-pressure air inlets is 6.

[0049] As shown in Figure 3 , the angle between the blowing direction of the plurality of third high-pressure air inlets 603 and the radial direction of the sprayer 6 is α; 10°≤α≤30°. The diameter of the inscribed circle of the blowing direction of the plurality of third high-pressure air inlets 603 is d in . Preferably, the value of the angle α is in the range of 20°-25°.

[0050] Specifically, the blowing direction of the third high-pressure air inlet 603 is inclined downward; as shown in Figure 2 , the third high-pressure air inlet 603 is arranged at an angle with the horizontal direction; the angle between the blowing direction of the third high-pressure air inlet 603 and the horizontal direction is 20°-30°.

[0051] Preferably, the cone angle of the internal cavity of the horn mouth of the sprayer 6 is 60°.

[0052] Specifically, the internal flow channel diameter of the connecting pipe at the upper end of the atomizer 6 is D0; the pipe opening diameters of the first high-pressure air inlet 601 and the second high-pressure air inlet 602 are the same, both being 2D0; the height H of the horn mouth of the atomizer 6 is (5-7)D0; the outer diameter D of the position where the third high-pressure air inlet 603 of the horn mouth is located is (4-6)D0, the internal cavity diameter D1 is (3-4)D0, and D1 is less than D.

[0053] Specifically, the cross section of the atomizer 6 at the height where the third high-pressure air inlet 603 is located is a circular ring, the inner diameter of the circular ring is D1; the diameter of the inscribed circle in the blowing direction of the third high-pressure air inlet 603 is d in ; and the internal cavity diameter of the atomizer 6 is greater than the diameter of the inscribed circle of the air inlet axis of the third high-pressure air inlet 631, that is, D1>d in . Preferably, d in =1 / 4D=(1-1.5)D0.

[0054] In the present application, high-pressure air is introduced into the first high-pressure air inlet 601 and the second high-pressure air inlet 602, and high-pressure air is introduced into the upper end of the atomizer 6, which is used to create a high-pressure environment inside the internal conical space of the atomizer 6, thereby promoting the atomization and spraying of the sludge.

[0055] In the present application, by setting multiple third high-pressure air inlets 603 to spray high-pressure air into the horn mouth of the atomizer 6, and the high-pressure air is distributed circumferentially, the sludge inside the horn mouth can be pressurized and vortexed.

[0056] Further, the second heat conduction oil pipe 7 communicating with the third heat conduction oil pipe is arranged on the inner wall of the spray drying furnace 5; the second heat conduction oil pipe 7 heats or insulates the furnace cavity of the spray drying furnace 5 through the internal flow of heat conduction oil.

[0057] In a specific embodiment of the present application, as shown in Figure 1 , multiple groups of second heat conduction oil pipes 7 are arranged on the furnace body of the spray drying furnace 5.

[0058] Preferably, as shown in Figure 1 , the furnace body of the spray drying furnace 5 is circular or rectangular in structure.

[0059] Further, multiple groups of second heat conduction oil pipes 7 are arranged on the inner wall surface of the spray drying furnace 5; each group of second heat conduction oil pipes 7 communicates with the first oil inlet 9 and the second oil inlet 10 arranged on the outer wall surface of the spray drying furnace 5. Preferably, the second heat conduction oil pipe 7 is spirally wound on the inner wall of the spray drying furnace 5.

[0060] Specifically, the first oil inlet interface 9 is communicated with the third heat conducting oil pipe of the gasification incinerator 30, the heat conducting oil flows between the third heat conducting oil pipe and the second heat conducting oil pipe 7, and then the heat can be transferred between the spray drying furnace 5 and the gasification incinerator 30, so that the heating of the internal cavity of the spray drying furnace 5 is realized. In the present application, the temperature of the air in the spray drying furnace 5 is raised by arranging the second heat conducting oil pipe 7 and the heat conducting oil in the second heat conducting oil pipe 7. After the sludge is sprayed into the spray drying furnace 5 by the sprayer 6, the sludge can be quickly dried, and most of the water vapor in the sludge is separated, so that the sludge is quickly dried.

[0061] In one specific embodiment of the present application, the second heat conducting oil pipe 7 is arranged in multiple groups in the form of a ring-shaped disc on the spray drying furnace 5, and the multiple groups of second heat conducting oil pipes 7 are parallel to each other. Preferably, the temperature of the heat conducting oil in the second heat conducting oil pipe 7 is 300-380 DEG C.

[0062] Further, in order to realize the regulation of the temperature in the spray drying furnace 5, the second electromagnetic valve and the second oil pump are arranged between the second heat conducting oil pipe 7 and the third heat conducting oil pipe, which are used to control the flow of the heat conducting oil in the second heat conducting oil pipe 7. The greater the flow of the heat conducting oil, the higher the temperature in the spray drying furnace 5. When the flow of the second heat conducting oil pipe 7 is adjusted to the maximum, the flow rate of the heat conducting oil is adjusted by controlling the rotating speed of the oil pump, so that the temperature in the furnace of the spray drying furnace 5 can be adjusted.

[0063] In the present application, the PID controller is arranged to adjust the rotating speed of the oil pump and the opening degree of the valve in the heat conducting oil circuit, so that the flow rate of the heat conducting oil and the amount of oil entering the first heat conducting oil pipe 4 and the second heat conducting oil pipe 7 can be controlled, and the temperature of the heat conducting oil, the temperature of the sludge pump channel 3 and the temperature of the furnace cavity of the spray drying furnace 5 can be regulated.

[0064] Further, in order to realize the rapid vaporization and drying of the sludge in the spray drying furnace 5, the first air inlet pipe 12 is communicated with the bottom of the spray drying furnace 5 in the present application. The first air inlet pipe 12 can blow the high-temperature air heated by the waste heat boiler 34 and the second gas heating preheater from the bottom of the spray drying furnace 5, so that the sludge is quickly dried by the high-temperature air.

[0065] In the present application, the first air inlet pipe 12 blows the high-temperature air in the form of bottom blowing. Preferably, the temperature of the high-temperature air in the first air inlet pipe 12 is not lower than 400 DEG C. In the present application, the sludge after atomization is dried by bottom blowing of high-temperature air, which can prevent the atomization and drying sludge debris from depositing at the bottom of the spray drying furnace 5, promote the up-and-down circulation of the sprayed sludge debris in the spray drying furnace 5, prolong the residence time of the sludge debris in the spray drying furnace 5, and then promote the drying effect, so that more water vapor in the sludge can be dried and taken away, the heat value of the sludge is improved, and the sludge has a relatively high temperature before entering the gasification incinerator 30.

[0066] Furthermore, in order to monitor the internal temperature of the spray drying oven 5, multiple temperature sensors are installed on the oven wall of the spray drying oven 5 to monitor the internal temperature of the cavity of the spray drying oven 5; specifically, the multiple temperature sensors are arranged at intervals along the height direction of the spray drying oven 5.

[0067] like Figure 1 As shown, a temperature sensor is installed on the first air inlet pipe 12 and the air outlet pipe 8 respectively; four temperature sensors are installed on the furnace body of the spray drying furnace 5.

[0068] In one specific embodiment of the present invention, the bottom of the spray drying furnace 5 is provided with a guide pipe 11; the upper end of the guide pipe 11 is connected to the inner cavity of the spray drying furnace 5, and the lower end is connected to the auger conveyor 13, so that the dried sludge is sent into the gasification incinerator 30 for incineration through the auger conveyor 13.

[0069] Specifically, the lower end of the spray drying furnace 5 is connected to the feed pipe 11, the upper end of the feed pipe 11 is connected to the inner cavity of the spray drying furnace 5, and the lower end is connected to the auger conveyor 13. The feed pipe 11 is used to guide the vaporized and dried sludge into the auger conveyor 13; then, the auger conveyor is driven to rotate by the drive motor 14, and the dried sludge is transported to the gasification incinerator 30 for incineration.

[0070] Specifically, the gas generated during sludge drying is discharged through the air outlet pipe 8 located at the upper end of the spray drying furnace 5; by controlling the flow rate of the second heat-conducting oil pipe 7 on the spray drying furnace 5, the temperature of the gas discharged through the air outlet pipe 8 is controlled to be greater than 100°C; preferably, the temperature of the gas discharged through the air outlet pipe 8 is 120°C.

[0071] Furthermore, a second solenoid valve and a second oil pump are provided between the second heat-conducting oil pipe 7 and the third heat-conducting oil pipe. In this invention, the oil quantity control in the first heat-conducting oil pipe 4 and the second heat-conducting oil pipe 7 is controlled by a PID controller. Specifically, the PID controller controls the flow rates of the first and second solenoid valves, as well as the rotational speeds of the first and second oil pumps, to achieve control over the oil quantity and temperature of the first and second heat-conducting oil pipes 4 and 7.

[0072] In one specific embodiment of the present invention, a condenser is used to post-treat the gas generated after the sludge is vaporized and dried in the spray dryer 5. The structure of the condenser is as follows: Figure 4 As shown. Specifically, the gas generated by baking the sludge in the spray drying furnace 5 is passed into a condenser for condensation; after condensation, liquid wastewater and gaseous non-condensable gas are produced; the wastewater is discharged and purified through biochemical treatment; the non-condensable gas is passed into a gasification incinerator 30 for incineration.

[0073] like Figure 4As shown, the condenser comprises: a wind box 17, a condensing pipe 18, a condensing pipe air inlet 19, a condensing pipe air outlet 20, a liquid discharge interface 21 and a heat exchange air pipe 22.

[0074] Specifically, the condensing pipe 18 is a tapered pipe or a trapezoidal pipe with gradually expanding size.

[0075] Specifically, one end of the condensing pipe 18 is provided with the condensing pipe air inlet 19, and the other end is provided with the condensing pipe air outlet 20. The exhaust gas discharged from the spray drying furnace 5 enters the condensing pipe 18 through the condensing pipe air inlet 19 and is discharged through the condensing pipe air outlet 20. Preferably, the condensing pipe air outlet 20 opens upward.

[0076] Specifically, the liquid discharge interface 21 is arranged below the condensing pipe 18 and at one end close to the condensing pipe air outlet 20.

[0077] Specifically, the wind box 17 is arranged on the side of the condensing pipe 18 and is fixedly connected with the condensing pipe 18 but not communicated. The heat exchange air pipes 22 are embeddedly installed in the condensing pipe 18, are arranged perpendicularly to the condensing pipe 18 and penetrate through the condensing pipe 18; one end of the heat exchange air pipes 22 is communicated with the wind box 17, and the other end is communicated with the external space; preferably, the plurality of heat exchange air pipes 22 are arranged at equal intervals along the axial direction of the condensing pipe 18.

[0078] Further, the air pump is installed at the air inlet of the wind box 17, and cold air can be introduced into the wind box 17 through the air pump.

[0079] In implementation, the cold air is introduced into the wind box 17 through the air pump, enters the heat exchange air pipes 22 through the wind box 17, and then exchanges heat with the gas flowing in the condensing pipe 18 through the heat exchange air pipes 22, so as to condense the exhaust gas discharged from the spray drying furnace 5. The liquid produced after condensation is discharged through the liquid discharge interface 21; the non-condensed gas (combustible gas in sludge) which does not change state after condensation is introduced into the gasification incinerator 30 for incineration.

[0080] Further, in order to improve the condensing effect of the condenser, the air distribution plate 24 is arranged in the wind box 17 and the air distribution plate 23 is arranged in the condensing pipe 18.

[0081] Specifically, the air distribution plate 24 is arranged parallel to the condensing pipe 18 and below the plurality of heat exchange air pipes 22; the surface of the air distribution plate 24 is provided with uneven air holes, so as to be capable of adjusting the air volume in the heat exchange air pipes 22 through the air distribution plate 24, realizing the step arrangement of cold air and improving the condensing effect.

[0082] Preferably, the size of the air holes on the air distribution plate 24 gradually decreases from the condenser inlet 19 to the condenser outlet 20. In turn, the amount of air flowing into the plurality of heat exchange air pipes 22 is gradually reduced, and the amount of air on the side close to the condenser inlet 19 is large, which can quickly exchange heat with the gas discharged from the spray drying furnace 5, thereby quickly cooling the gas. After the gas is sequentially exchanged with the plurality of heat exchange air pipes 22, the temperature gradually decreases, and the amount of air in the heat exchange air pipe 22 gradually decreases in coordination with the step-by-step heat exchange of the gas in the condenser 18. Through reasonable air distribution, the present application can reduce the air consumption of the cold air under the premise of realizing rapid condensation of the gas, thereby reducing the power of the equipment and saving the cost of sludge treatment.

[0083] Specifically, as shown in Figure 4 , the air distribution plate 23 is arranged inside the condenser 18, and the surface is provided with uniformly distributed air holes. After the gas in the condenser 18 is condensed by the heat exchange air pipe 22, the gas is uniformly distributed by the air distribution plate 23 and then discharged from the condenser outlet 20.

[0084] In implementation, the high-temperature gas discharged from the air outlet pipe 8 of the spray drying furnace 5 is condensed by the condenser, and the temperature of the gas is reduced. Part of the gas is liquefied as liquid and discharged as sewage, and the chemical substances dissolved in the sewage are purified by biochemical treatment. After condensation, the non-condensed gas is introduced into the gasification incinerator 30 for incineration.

[0085] In the embodiment, the plurality of heat exchange air pipes 22 are arranged to exchange heat with the high-temperature gas, and the air distribution plate 24 is arranged to adjust the flow of cold air in the plurality of heat exchange air pipes 22, thereby realizing step-by-step heat exchange. With the step-by-step reduction of the temperature of the gas, the amount of cold air introduced is reduced, thereby avoiding excessive consumption of cold air, reducing the power of the fan and / or refrigeration equipment, reducing energy consumption, and reducing treatment cost.

[0086] Embodiment 2

[0087] In one specific embodiment of the present application, a sludge gasification drying method is provided, as shown in Figure 5 , comprising the following steps:

[0088] Step S1: Preheat the sludge in the sludge pump pipe 3;

[0089] Step S2: The sprayer sprays the sludge under pressure;

[0090] Step S3: The spray drying furnace 5 bakes the atomized sludge to realize gasification drying;

[0091] Step S4: The bottom blowing hot air of the spray drying furnace 5 carries away the gas generated by the sludge gasification drying.

[0092] In the step S1, the sludge in the sludge pump pipe 3 is heated by the heat conduction oil in the first heat conduction oil pipe 4, so that the temperature of the sludge is increased once before entering the spray drying furnace 5.

[0093] In the step S1, the temperatures of the multiple positions of the first heat conduction oil pipe 4 are respectively t1, t2, t3... measured by the multiple temperature sensors outside the sludge pump pipe 3, and then the average of the multiple temperature values is calculated to determine the heating temperature of the sludge pump pipe 3.

[0094] In the step S2, the multiple high-pressure air streams blown in by the third high-pressure air inlet interface 603 can form a high vortex airflow in the circumferential direction of the sludge, thereby promoting the decomposition and atomization of the sludge, and the sludge particles after decomposition and atomization have a certain speed and are sprayed into the inner cavity of the spray drying furnace 5 to realize the atomization and spraying of the sludge.

[0095] In the step S2, the sludge in the atomizer 6 is pressurized by the first high-pressure air inlet interface 601 and the second high-pressure air inlet interface 602, so that the atomization pressure can be maintained when the sludge is atomized by the multiple third high-pressure air inlet interfaces 603, thereby avoiding the influence of the decrease of the pressure inside the cavity of the atomizer 6 on the atomization effect.

[0096] In the step S2, when the sludge is atomized and sprayed by the atomizer 6, the pressure of the high-temperature air in the first air inlet pipe 12 is Po, the gas pressure of the spray drying furnace 5 is lower than that of the first air inlet pipe 12, and the pressure value in the cavity of the spray drying furnace 5 is Ped; the difference ΔP between Po and Ped is used as a variable of the conveying amount of the bottom auger conveyor 13, ΔP=Po-Ped, and in actual application, the upper limit and lower limit ΔPmax and ΔPmin of ΔP are given.

[0097] In the implementation, ΔPmax and ΔPmin are calibrated on site to control the material guiding speed of the material guiding pipe 11, and ΔP is controlled to be between ΔPmax and ΔPmin, when the pressure difference is too large, the speed of the auger conveyor 13 is reduced, and when the pressure difference is too low, the conveying efficiency of the auger conveyor 13 is increased.

[0098] In the step S3, the temperatures monitored from bottom to top by the multiple temperature sensors on the spray drying furnace 5 are respectively T0, T1, T2, T3, T4, and T5; the average of the weighted values of the above five temperature values is obtained, that is, the parameter T representing the temperature of the spray drying furnace 5 is obtained.

[0099] In the step S3, the weighted value is a number between 0.8 and 1.2 according to the correlation between the temperature of different positions and the temperature inside the furnace chamber. Specifically, the amount of sprayed sludge (sludge pump speed) in the spray drying furnace 5 is related to the entire temperature distribution of T1-T5, and the weighted (average) T1, T2, T3, T4 and T5 are used to adjust the air volume of the first air inlet pipe 12 at the bottom, and when the air volume is maximum, the speed of the sludge pump is adjusted in reverse.

[0100] Further, in the steps S3 and S4, the process of baking and flash evaporation of sludge in the spray drying furnace 5 and the process of vaporization and drying of sludge by the bottom hot air blowing are continuously carried out during the falling of the sludge; at the same time, the bottom hot air blowing of the first air inlet pipe 12 into the spray drying furnace 5 can promote the turbulence of the sludge inside the furnace chamber.

[0101] Embodiment 3

[0102] In one specific embodiment of the present application, a sludge vaporization and drying incineration integrated treatment system is provided, which comprises the sludge drying device of embodiment 1 and uses the sludge drying device of embodiment 1 to vaporize and dry the sludge. Further, the sludge vaporization and drying incineration integrated system of the present embodiment further comprises a screw conveyor 13, a gasification incinerator 30, a waste heat boiler 34 and a gas preheater.

[0103] As shown in Figure 1 , the screw conveyor 13 is used to pass the vaporized and dried sludge discharged from the bottom of the spray drying furnace 5 into the gasification incinerator 30 for incineration.

[0104] As shown in Figure 6 , the gasification incinerator 30 comprises a gasification incineration chamber and a flue gas furnace channel; the gasification incineration chamber is used to incinerate combustible dried sludge and non-condensable gas; the flue gas furnace channel is in communication with the waste heat boiler 34, and the high-temperature flue gas generated by combustion is introduced into the waste heat boiler 34.

[0105] Specifically, the gasification incineration chamber is used to incinerate dried sludge, and the internal incineration temperature reaches 900℃.

[0106] As shown in Figure 6 , the flue gas furnace channel is in an inverted U-shaped structure and is used to guide the flue gas after incineration of the sludge. The lower end of the flue gas furnace channel is provided with a dust discharge port for guiding the medium ash after incineration of the sludge. The side of the flue gas furnace channel is provided with a separator, the separator is in communication with the side of the flue gas furnace channel, and the bottom of the separator is provided with a dust discharge port for guiding the medium ash.

[0107] Specifically, the flue gas furnace channel comprises: a first flue gas furnace channel 25, a second flue gas furnace channel 26 and a communication furnace channel 27; wherein the lower end of the first flue gas furnace channel 25 is communicated with the gasification incineration chamber, and the first flue gas furnace channel 25 is arranged in parallel to the second flue gas furnace channel 26; the upper end of the first flue gas furnace channel 25 is communicated with the upper end of the second flue gas furnace channel 26 through the communication furnace channel 27.

[0108] In the present application, the sludge is gasified in the gasification incineration chamber of the gasification incineration furnace 30 to produce gasification gas, and the gasification gas is incinerated in the gasification incineration chamber; the gasification gas is also combusted in the first flue gas furnace channel 25.

[0109] Further, the third heat conduction oil pipe is arranged on the wall surface of the first flue gas furnace channel 25, the third heat conduction oil pipe recovers the heat generated by the incineration of the gasification incineration furnace 30 through the heat conduction oil, and then the heat conduction oil is introduced into the first heat conduction oil pipe 4 and the second heat conduction oil pipe 7 to preheat and dry the sludge.

[0110] The third heat conduction oil pipe is provided with a second oil inlet interface 28 and a second oil outlet interface 29, wherein the second oil inlet interface 28 is used to introduce the heat conduction oil flowing back from the first heat conduction oil pipe 4 and the second heat conduction oil pipe 7 into the third heat conduction oil pipe; and the second oil outlet interface 29 is used to provide the heat conduction oil heated by the gasification incineration furnace 30 to the first heat conduction oil pipe 4 and the second heat conduction oil pipe 7.

[0111] Further, the heat conduction oil in the third heat conduction oil pipe is divided into three paths after being heated by the gasification incineration furnace 30: one path is supplied to the first heat conduction oil pipe 4 to preheat the sludge; one path is supplied to the second heat conduction oil pipe 7 to gasify and dry the sprayed sludge; and one path is supplied to the air cooler to be cooled, and the flow of the heat conduction oil supplied to the air cooler is adjusted through a valve, so as to control the temperature of the heat conduction oil.

[0112] Preferably, the temperature of the heat conduction oil in the first heat conduction oil pipe 4 and the second heat conduction oil pipe 7 is controlled to be 300-380℃.

[0113] Further, the end of the second flue gas furnace channel 26 is provided with a cooling liquid circulation loop; the cooling liquid circulation loop comprises: a liquid cooling pipe, a water inlet interface 32 and a water outlet interface 33; the liquid cooling pipe is wound and arranged on the outer wall of the end of the second flue gas furnace channel 26, and the two ends are respectively connected to the water inlet interface 32 and the water outlet interface 33; a water tank and a water pump are connected between the water inlet interface 32 and the water outlet interface 33, which are used to introduce cooling liquid into the liquid cooling pipe, so as to cool the second flue gas furnace channel 26, and the flue gas in the second flue gas furnace channel 26 is discharged in the form of medium ash after being cooled.

[0114] Further, a waste heat boiler 34 is communicated with the upper end of the flue gas furnace channel or the upper end of the separator, and the high-temperature flue gas generated by incineration enters the waste heat boiler 34. Preferably, the temperature of the high-temperature flue gas in the waste heat boiler 34 is 550℃±50°.

[0115] In one embodiment of the present application, as shown in Figure 6 The waste heat boiler 34 is in an inverted U-shaped structure, one end of which is connected to the flue gas channel, and the other end is provided with a dust outlet 37 and a flue gas outlet 38. The first gas preheater 35 and the second gas preheater 36 are nested on the waste heat boiler 34, and the first gas preheater 35 and the second gas preheater 36 can heat the gas flowing through them by absorbing the waste heat of the flue gas in the waste heat boiler 34.

[0116] Further, the first gas preheater 35 is used to preheat the non-condensable gas discharged from the condenser; and the second gas preheater 36 is used to preheat the air.

[0117] It is considered that the temperature of the non-condensable gas discharged from the condenser is low (low enthalpy), so that the temperature in the gasification incinerator 30 will be reduced after the non-condensable gas is directly introduced into the gasification incinerator 30, and the incineration energy consumption of the gasification incinerator 30 will be increased. Therefore, in the present application, the non-condensable gas is heat-exchanged by the waste heat boiler 34 to absorb the heat of the incineration flue gas to increase the enthalpy before being introduced into the gasification incinerator 30 for incineration.

[0118] Specifically, the non-condensable gas after being condensed by the condenser pipe 18 is first introduced into the first gas preheater 35 for preheating, and then introduced into the gasification incinerator 30 for combustion. Preferably, the temperature of the non-condensable gas after being preheated by the first gas preheater 35 is not lower than 200°C.

[0119] As shown in Figure 1 , Figure 6 The air is introduced into the second gas preheater 36, and the low-temperature air is heated by the high-temperature flue gas in the waste heat boiler 34 to obtain high-temperature air. Further, the obtained high-temperature air is introduced into the spray drying furnace 5 and the gasification incinerator 30 respectively, thereby realizing the gasification drying and incineration of the sludge.

[0120] Specifically, the air is preheated to 400°C by the second gas preheater 36; the high-temperature air at 400°C is divided into two paths, one path is introduced into the furnace cavity through the first air inlet pipe 12 at the bottom of the spray drying furnace 5 to dry the sludge, and the other path is introduced into the gasification incineration chamber through the second air inlet pipe 31 at the bottom of the gasification incinerator 30 to incinerate the dried sludge.

[0121] In the present application, the gas outlet of the second gas preheater 36 is arranged upstream of the first gas preheater 35. The temperature of the gas after being preheated by the second gas preheater 36 is higher than that of the first gas preheater 35.

[0122] Specifically, the principles of the first gas preheater 35 and the second gas preheater 36 are the same.

[0123] For example, the second gas preheater 36 includes: a housing 361 and a connecting ventilation duct 362; wherein multiple housings 361 are provided, and the housings 361 are covered on the outside of the waste heat boiler 34; the connecting ventilation duct 362 is used to connect multiple housings 361, and when air flows through multiple housings 361 in sequence, it can exchange heat with the waste heat boiler 34 and the high-temperature flue gas inside it.

[0124] For example, the second gas preheater 36 includes a preheating pipe 363 and a connecting ventilation duct 362. Specifically, the preheating pipe 363 is installed through the interior of the waste heat boiler 34, and its two ends are connected to the connecting ventilation duct 362 / inlet air duct / outlet air duct. In use, the preheating pipe 363 is in direct contact with the high-temperature flue gas inside the waste heat boiler 34, thereby heating the gas flowing inside the preheating pipe 363. Specifically, multiple sets of preheating pipes 363 are provided, and two sets of preheating pipes 363 are connected by the connecting ventilation duct 362. Preferably, multiple preheating pipes 363 of the same set are arranged in multiple rows and columns inside the waste heat boiler 34, and adjacent rows of preheating pipes 363 are staggered in the flue gas flow direction, such as... Figure 7 As shown.

[0125] Preferably, in this embodiment, the preheating pipe 363 is configured as a gradually narrowing expansion pipe; for example... Figure 8 As shown, the preheating tube 363 is a rectangular tube with at least one spherical expansion cavity in the middle. Gas flows in the preheating tube 363. When the gas flows through the spherical expansion cavity of the preheating tube 363, a vortex phenomenon is generated, which promotes heat exchange between the gas and the tube wall of the preheating tube 363, thereby improving the heat exchange efficiency and enabling the gas to reach the expected temperature after flowing through the gas preheater.

[0126] In this invention, a built-in preheating pipe 363 is used to exchange heat with high-temperature flue gas (550°C) to improve the preheating effect and efficiency of the air, so that the low-temperature air can reach the expected temperature (400°C) in a short time, so as to supply enough oxygen to the gasification incineration chamber for combustion, and to supply enough high-temperature air to the spray drying furnace 5 to dry the sludge, thereby improving the sludge treatment efficiency and quality.

[0127] In one specific embodiment of the present invention, such as Figure 6 As shown, the second gas preheater 36 is provided with four housings 361, and the four housings 361 are connected by a ventilation duct 362. Specifically, three sets are arranged from bottom to top in the tail section (low-temperature section) of the U-shaped waste heat boiler 34, with the bottommost housing 361 connected to the air inlet duct. Simultaneously, one housing 361 is arranged in the front section (high-temperature section) of the waste heat boiler 34, and the housing 361 in the front section of the waste heat boiler 34 is connected to the air outlet duct. Specifically, the front and tail sections of the preheating boiler 34 are divided according to the flow sequence of the high-temperature flue gas within them.

[0128] Or, such as Figure 6As shown, the second gas preheater 36 is provided with four groups of preheating pipes 363, and the four groups of preheating pipes 363 are communicated through the communication air duct 362. Among them, three groups of preheating pipes 363 are arranged from bottom to top in the tail section (low temperature section) of the U-shaped waste heat boiler 34, and one group of preheating pipes 363 is arranged in the head section (high temperature section) of the waste heat boiler 34. And the lowest group of preheating pipes 363 in the tail section is connected to the air inlet duct, and the preheating pipe 363 in the head section is connected to the air outlet duct.

[0129] In use, the air flows through the three groups of preheating pipes 363 in the tail section of the waste heat boiler 34 in sequence, and then enters the preheating pipe 363 in the head section, so as to realize the step-by-step preheating of the air, gradually increase the air temperature, and achieve the optimal preheating effect.

[0130] Correspondingly, the first gas preheater 35 for preheating the non-condensable gas is arranged in the middle section of the waste heat boiler 34, as shown. Figure 6 Further, by controlling the length and flow speed of the flow path of the non-condensable gas / air in the first gas preheater 35 / second gas preheater 36, the temperature of the non-condensable gas / air after preheating by the first gas preheater 35 / second gas preheater 36 is controlled. In the present application, the preheated non-condensable gas is 200℃±5°, and the preheated air temperature is not less than 400℃.

[0131] It is worth noting that: "high temperature", "low temperature" in the present application represent the temperature change before and after the gas / conductive oil is heated, or before and after heat exchange, which is used to distinguish the heat absorption or heat release state of the substance, and does not represent the specific temperature range.

[0132] Compared with the prior art, the technical scheme provided by the present embodiment has at least one of the following beneficial effects:

[0133] 1. In the present embodiment, the preheated sludge is sprayed and exploded in the cavity formed by the second conductive oil pipe 7 (300℃) inside the spray drying furnace 5, and is sent to the hot air (400℃) at the bottom of the spray drying furnace 5 for ventilation drying. After drying, the moisture content of the sludge is reduced from 72% to 60% or even lower, and after entering the gasification incinerator, it is first gasified and then incinerated.

[0134] 2. The sludge incineration equipment of the present application realizes a solution with high energy efficiency and low operating cost; the current direct operating cost can be as low as 150 yuan / t, while the operating cost of the prior art is generally 350-400 yuan / t, and the present application is 200-250 yuan / t lower than the prior art.

[0135] 3. The related equipment of the present application has simple structure and is easy to manufacture, and the initial investment can be significantly reduced; after the treatment method of the present application is practiced, it is shown that the initial investment of the technical equipment of the present application is about 200,000 yuan / t / d, and the initial investment of the prior art is generally 350-400 yuan / t / d.

[0136] 4. In the present application, according to the principle of heat gradient utilization and the principle of auxiliary fuel minimization, the drying and incineration integrated system is arranged, the heat utilization rate is high, the energy consumption of sludge treatment is greatly reduced, and the comprehensive treatment cost is reduced.

[0137] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A sludge spray drying device, characterized in that, include: The sludge pump pipe (3), spray drying furnace (5), sprayer (6), and heating device installed on the sludge pump pipe (3) and spray drying furnace (5); the sludge pump pipe (3) is installed above the spray drying furnace (5) and passes through the spray drying furnace (5), and the end of the sludge pump pipe (3) is connected to the sprayer (6); the sprayer (6) is used to atomize and spray sludge into the inner cavity of the spray drying furnace (5); The heating device is used to heat the sludge pump pipe (3) and the spray drying furnace (5); the heating device includes: a first heat-conducting oil pipe (4) and a second heat-conducting oil pipe (7); the first heat-conducting oil pipe (4) is disposed outside the sludge pump pipe (3); The second heat-conducting oil pipe (7) is installed on the inner wall of the cavity of the spray drying furnace (5); the first heat-conducting oil pipe (4) and the second heat-conducting oil pipe (7) are both filled with heat-conducting oil; the heat-conducting oil flows through the gasification incinerator and can transfer the heat generated by the gasification incineration of sludge to the sludge pump pipe (3) and the spray drying furnace (5). The sprayer (6) has a conical structure; the upper end of the sprayer (6) is connected to the sludge pump pipe (3), and the lower end has a conical flared mouth; multiple third high-pressure air inlets (603) are provided on the outside of the flared mouth; the angle between the blowing direction of the third high-pressure air inlet (603) and the radial direction of the sprayer (6) is α; the diameter of the inscribed circle of the blowing direction of the multiple third high-pressure air inlets (603) is d. in By setting multiple third high-pressure air inlets (603) to spray high-pressure air into the nozzle of the sprayer (6), and the high-pressure air is distributed circumferentially, which can circumferentially pressurize and vortex crush the sludge inside the nozzle.

2. The sludge spray drying device according to claim 1, characterized in that, Multiple third high-pressure air inlets (603) are evenly distributed in an array on the outer circumferential direction of the nozzle of the sprayer (6), and multiple third high-pressure air inlets (603) are located at the same height.

3. The sludge spray drying device according to claim 2, characterized in that, 5°≤α≤30°。 4. The sludge spray drying device according to claim 3, characterized in that, The first heat transfer oil pipe (4) and the second heat transfer oil pipe (7) are both spirally coiled on the sludge pump pipe (3) or the spray drying furnace (5); the heat transfer oil flows through the gasification incinerator, thereby transferring the heat generated by the gasification and incineration of sludge to the sludge pump pipe (3) and the spray drying furnace (5).

5. The sludge spray drying apparatus according to any one of claims 1-4, characterized in that, The first heat transfer oil pipe (4) is connected to the first solenoid valve (15) and the first oil pump (16). The first solenoid valve (15) is used to adjust the flow rate of heat transfer oil in the first heat transfer oil pipe (4), and the first oil pump (16) is used to control the flow rate of heat transfer oil in the first heat transfer oil pipe (4).

6. The sludge spray drying apparatus according to any one of claims 1-4, characterized in that, The second heat transfer oil pipe (7) is connected to the second solenoid valve and the second oil pump; the second solenoid valve is used to adjust the flow rate of heat transfer oil in the second heat transfer oil pipe (7), and the second oil pump is used to control the flow rate of heat transfer oil in the second heat transfer oil pipe (7).

7. The sludge spray drying device according to claim 1, characterized in that, The spray drying furnace (5) is provided with a first air inlet pipe (12) at the lower end and an air outlet pipe (8) at the upper end; the first air inlet pipe (12) is used for bottom blowing hot air; the air outlet pipe (8) is used to discharge the gas after the sludge is vaporized and dried.

8. A method for sludge vaporization and drying, characterized in that, The sludge to be treated is vaporized and dried using the sludge spray drying apparatus according to any one of claims 1-7.

9. A sludge gasification, drying, and incineration integrated treatment system, characterized in that, The sludge spray drying apparatus includes any one of claims 1-7.

Images