CN109205992B - Biological sludge heating and pyrohydrolysis system and process - Google Patents

Abstract

The invention discloses a biological sludge heating and pyrohydrolysis system and a process, wherein the system comprises a material preheater, a material delivery pump, a primary steam ejector, a material storage, a feeding pump, a pyrohydrolysis reactor, a discharging pump, a steam flash evaporator and a pressure release valve which are sequentially communicated end to end through a pipeline, and a secondary steam ejector for heating biological sludge in the pyrohydrolysis reactor. The process adopts the system for heating and thermal hydrolysis. The biological sludge heating and pyrohydrolysis system has the advantages of good heat transfer effect, good material heating uniformity, small steam consumption, short heating time, good continuous operation stability and the like, can be widely used for degrading biological sludge, and has good application value and application prospect. The biological sludge heating and pyrohydrolysis system process has the advantages of simple process, convenient operation, low treatment cost, high treatment efficiency, good treatment effect and the like, and is favorable for improving the utilization rate of biological sludge and expanding the application range of anaerobic digestion.

Description

Biological sludge heating and pyrohydrolysis system and process

Technical Field

The invention belongs to the field of biological sludge recycling treatment, and relates to a biological sludge heating and pyrohydrolysis system and a biological sludge heating and pyrohydrolysis process.

Background

With the continuous development of society and economy, the yield of biological sludge such as biogas residue, activated sludge and the like is increased more and more. At present, the research focus of the biological sludge pretreatment comprises high-temperature pyrohydrolysis, biological acidification hydrolysis, high-temperature high-pressure oxidation, ultrasonic treatment, high-temperature homogenization, ozone chemical treatment and the like, wherein the high-temperature pyrohydrolysis technology is characterized in that the biological sludge is heated to 180 ℃ so as to achieve the purposes of destroying the floc structure, destroying the cell wall tissue and degrading partial macromolecular substances. The high-temperature pyrohydrolysis can degrade solid particles and macromolecular substances which are difficult to degrade in the biological sludge so as to increase the content of organic acid and dissolved organic matters, and the high-temperature pyrohydrolysis is used as a pre-pretreatment process of anaerobic digestion, so that the gas yield of the anaerobic digestion is increased, the output of consumed biogas residues is reduced, and the high-temperature pyrohydrolysis technology is used for the pre-pretreatment of the anaerobic digestion.

The existing sludge pyrohydrolysis system mainly comprises an intermittent pyrohydrolysis system (such as CAMBI (conbi) product), a continuous vertical baffle pyrohydrolysis system (such as willieys product) and a hot oil pipe type heating system (such as Ovivo water LysoTherm product), wherein the intermittent pyrohydrolysis system represented by CAMBI is most widely applied. Taking a CAMBI product as an example, the batch type thermal hydrolysis system comprises a preheating slurrying tank, a thermal hydrolysis reaction kettle and a pressure-relief flash tank, and the main flow comprises the steps of pumping dewatered sludge with the dry solid content of 16-18% into the preheating slurrying tank to be preheated to 90-100 ℃, then pumping the dewatered sludge into the thermal hydrolysis reaction kettle to be heated to 165 ℃, reacting for 20-30 minutes at the temperature, sending the sludge into the pressure-relief flash tank to be cooled to 100 ℃ after the reaction is finished, and then continuously cooling to the temperature required by anaerobic digestion. However, the intermittent thermal hydrolysis system and the process still have the following defects: steam is introduced into the large-volume preheating slurrying tank for preheating, and as the concentration of the dry solids of the dewatered sludge is as high as 16-18%, the uniformity of the sludge heated in the heating process is poor, and the heat transfer efficiency is low, the heating time is long, and the steam consumption is large; the thermal hydrolysis process of the CAMBI product can realize continuous operation only by adopting a plurality of thermal hydrolysis reaction kettles, and has the problems of complex process control, high equipment investment cost and the like. A continuous vertical baffle plate thermal hydrolysis system represented by a Weiliya Exelys product mainly realizes the circular flow of sludge in a thermal hydrolysis reactor by installing baffle plates in a vertical thermal hydrolysis reactor and improving the effect through steam so as to achieve the required reaction time (about 20 min). If the sludge solid concentration is reduced, the sludge treatment amount and the treatment energy consumption are obviously increased, and the treatment cost is higher. Hot oil pipe heating systems (such as the Ovivo water LysoTherm products) that use oil hot pipe heaters to heat sludge also result in lower heat transfer efficiency due to the high viscosity and poor flow properties of high solids content sludge, thereby increasing the manufacturing and operating costs of the equipment. Therefore, the following problems are generally existed in the equipment adopted in the prior high-temperature pyrohydrolysis technology when the high-solid content sludge is treated: poor heat transfer effect, uneven heating of materials, large steam consumption, long heating time and poor continuous operation stability, and thus the problems of high equipment input cost, high treatment cost, poor treatment effect and the like are caused. In addition, in the practical application process, the existing high-temperature pyrohydrolysis equipment and process are adopted to pretreat biological sludge such as activated sludge and the like, and then the products after the high-temperature pyrohydrolysis treatment are subjected to anaerobic digestion, so that the integral gas production cannot be obviously improved. The above problems limit the application effect and application range of the anaerobic digestion technology, are very unfavorable for effective treatment and resource recycling of the biological sludge, and cannot bring out the due value of the biological sludge. Therefore, how to effectively improve the problems and obtain the thermal hydrolysis device with good heat transfer effect, good material heating uniformity, small steam consumption, short heating time and good continuous operation stability and the matched thermal hydrolysis method have important significance for improving the utilization rate of biological sludge and expanding the application range of anaerobic digestion.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a biological sludge heating and pyrohydrolysis system and a biological sludge heating and pyrohydrolysis process which have the advantages of good heat transfer effect, good material heating uniformity, small steam consumption, short heating time and good continuous operation stability.

In order to solve the technical problems, the invention adopts the following technical scheme.

A biological sludge heating and pyrohydrolysis system comprises a material preheater, a material delivery pump, a primary steam ejector, a material storage, a feeding pump, a pyrohydrolysis reactor, a discharging pump, a steam flash evaporator and a pressure release valve which are sequentially communicated end to end through pipelines; the biological sludge heating and pyrohydrolysis system further comprises a secondary steam ejector for heating the biological sludge in the pyrohydrolysis reactor.

In the biological sludge heating and pyrohydrolysis system, the secondary steam ejector comprises an external steam conveying pipe and at least one external steam injection pipe, one end of the external steam injection pipe is communicated with the external steam conveying pipe, and the other end of the external steam injection pipe is communicated with the pyrohydrolysis reactor; the thermal hydrolysis reactor is of a horizontally arranged cylindrical structure, and a spiral guide plate, an oblique guide plate, a vertical guide plate or a separation partition plate are arranged in the thermal hydrolysis reactor.

In the above biological sludge heating and pyrohydrolysis system, the secondary steam ejector further comprises a built-in steam delivery pipe, wherein one end of the built-in steam delivery pipe is arranged at the side end of the pyrohydrolysis reactor, and the other end of the built-in steam delivery pipe extends into the pyrohydrolysis reactor; the built-in steam conveying pipe is provided with a steam jet hole.

In the biological sludge heating and pyrohydrolysis system, the internal steam delivery pipe is rotatably arranged at the side end of the pyrohydrolysis reactor; the built-in steam conveying pipe and the outer part of the pyrohydrolysis reactor are connected with a power mechanism for rotating the built-in steam conveying pipe; the power mechanism comprises a motor and a transmission wheel set, and the motor drives the built-in steam delivery pipe to rotate through the transmission wheel set.

In the biological sludge heating and pyrohydrolysis system, the built-in steam conveying pipe is further improved and is communicated with at least one steam diffusion pipe; and the side wall of the steam diffusion pipe is provided with steam diffusion holes.

In the biological sludge heating and pyrohydrolysis system, a spiral conveying plate is arranged on the built-in steam conveying pipe.

In the biological sludge heating and pyrohydrolysis system, the internal steam delivery pipe is fixedly arranged at the side end of the pyrohydrolysis reactor; the thermal hydrolysis reactor is of a horizontally arranged cylindrical structure, at least one partition plate is arranged in the thermal hydrolysis reactor, and the partition plate is arranged above the built-in steam conveying pipe.

In the biological sludge heating and pyrohydrolysis system, the internal steam conveying pipe is fixedly arranged at the side end of the pyrohydrolysis reactor, the internal steam conveying pipe is communicated with at least one steam diffusion pipe, and the side wall of the steam diffusion pipe is provided with steam diffusion holes.

In the biological sludge heating and pyrohydrolysis system, the internal steam conveying pipe is fixedly arranged at the side end of the pyrohydrolysis reactor, and the spiral conveying plate is arranged on the internal steam conveying pipe.

As a general technical concept, the present invention also provides a biological sludge heating and pyrohydrolysis process, which uses the above biological sludge heating and pyrohydrolysis system for heating and pyrohydrolysis, comprising the steps of:

s1, preheating the biological sludge in the material preheater;

s2, continuously conveying the biological sludge preheated in the step S1 to a primary steam ejector by using a material conveying pump, carrying out primary heating on the biological sludge by using high-pressure steam, and storing the obtained biological sludge in a material storage;

s3, continuously conveying the biological sludge in the material storage to a thermal hydrolysis reactor by using a feed pump, and simultaneously continuously conveying high-pressure steam to the thermal hydrolysis reactor by using a secondary steam ejector to carry out secondary heating on the biological sludge to generate a thermal hydrolysis reaction;

s4, continuously conveying the feed liquid subjected to thermal hydrolysis in the step S3 to a steam flash evaporator by using a discharge pump, simultaneously carrying out flash evaporation on the feed liquid in the steam flash evaporator by controlling a pressure release valve to obtain low-pressure steam and a thermal hydrolysis concentrated solution, returning the obtained low-pressure steam to the step S1 to preheat biological sludge in a material preheater, and discharging the obtained thermal hydrolysis concentrated solution for subsequent treatment to finish the treatment of the biological sludge.

In the above-mentioned biological sludge heating and pyrohydrolysis process, in a further improvement, in step S1, the biological sludge is biogas residue and/or activated sludge.

In the above biological sludge heating and thermal hydrolysis process, in a further improvement, in step S4, the subsequent treatment of the thermal hydrolysis concentrated solution adopts any one of the following manners;

the first method is as follows: cooling the concentrated solution to 35-55 ℃, and sending the concentrated solution to a primary anaerobic digestion tank for primary anaerobic digestion;

the second method comprises the following steps: cooling the thermal hydrolysis concentrated solution to 35-55 ℃, and sending the thermal hydrolysis concentrated solution to a secondary anaerobic digestion tank for secondary anaerobic digestion;

the third method comprises the following steps: and (3) carrying out solid-liquid separation on the thermal hydrolysis concentrated solution, dehydrating and drying the obtained solid to obtain an organic fertilizer, and conveying the obtained liquid serving as a raw material for producing the methane to a primary anaerobic digestion tank or a secondary anaerobic digestion tank.

Compared with the prior art, the invention has the advantages that:

(1) the invention provides a biological sludge heating and pyrohydrolysis system which comprises a material preheater, a material delivery pump, a primary steam ejector, a material storage, a feeding pump, a pyrohydrolysis reactor, a discharging pump, a steam flash evaporator, a pressure release valve and a secondary steam ejector, wherein the material preheater, the material delivery pump, the primary steam ejector, the material storage, the feeding pump, the pyrohydrolysis reactor, the discharging pump, the steam flash evaporator and the pressure release valve are sequentially communicated with one another end to end through pipelines, and the secondary steam ejector is used for heating biological sludge in the pyrohydrolysis reactor. According to the invention, the biological sludge heating and pyrohydrolysis system is provided with the primary steam ejector, the primary steam ejector is adopted to fully mix the high-pressure steam and the biological sludge, the heat of the high-pressure steam is utilized to carry out primary heating on the biological sludge, the heat transfer effect can be enhanced, the biological sludge can be rapidly heated to about 100 ℃, the steam consumption can be reduced, the treatment cost is favorably reduced, the high-pressure steam and the biological sludge are mixed, the mixing effect can be enhanced, namely, the primary steam ejector can obviously improve the mixing efficiency and the heat transfer efficiency between the biological sludge and the steam, and the heating time and the steam consumption are reduced. The biological sludge heating and pyrohydrolysis system is provided with a material storage device for storing biological sludge heated by the primary steam ejector, and the occupied area of the material storage device is smaller. On the basis, the biological sludge heating and pyrohydrolysis system is also provided with a secondary steam ejector for carrying out secondary heating on the biological sludge in the pyrohydrolysis reactor, in particular to a secondary steam ejector for continuously conveying high-pressure steam to carry out secondary heating on the biological sludge in the pyrohydrolysis reactor, which not only can utilize the heat of the high-pressure steam to enhance the heating effect on the biological sludge and ensure that the heat transfer effect of the biological sludge is better, thereby ensuring that the biological sludge can quickly reach the temperature required by pyrohydrolysis, ensuring that the biological sludge in the pyrohydrolysis reactor is fully pyrolyzed in a short time, but also can enhance the mixing effect of the biological sludge by utilizing the high-pressure steam sprayed at high speed, reducing the energy required by stirring and mixing, being beneficial to enhancing the heating uniformity of the biological sludge, enhancing the pyrohydrolysis effect, and simultaneously promoting the flow of the biological sludge in the pyrohydrolysis reactor by the high-pressure steam sprayed at high speed, and finally, the organic substances in the biological sludge, particularly the organic substances which are difficult to degrade, are efficiently hydrolyzed into organic acid, soluble organic substances and other small molecular substances which can be effectively utilized by microorganisms, so that the aims of improving the thermal hydrolysis effect, reducing the treatment cost and the like are fulfilled. In addition, this biological sludge heating and pyrohydrolysis system is equipped with charge pump and discharge pump, through controlling charge pump and discharge pump, can effective control in the pyrohydrolysis reactor biological sludge's input and output volume, is favorable to improving the stability of continuous heating, pyrohydrolysis and flash distillation, and is favorable to improving the treatment effeciency. The biological sludge heating and pyrohydrolysis system has the advantages of good heat transfer effect, good material heating uniformity, small steam consumption, short heating time, good continuous operation stability and the like, can be widely used for degrading biological sludge (such as biogas residues, activated sludge and the like), can realize effective degradation of the biological sludge, and has good application value and application prospect.

(2) The invention also provides a biological sludge heating and pyrohydrolysis process, and the biological sludge heating and pyrohydrolysis system is adopted for heating and pyrohydrolysis, so that intermittent operation and continuous operation can be realized, and the biological sludge heating and pyrohydrolysis system has the advantages of simple process, convenience in operation, low treatment cost, high treatment efficiency, good treatment effect and the like, and is beneficial to improving the utilization rate of biological sludge and expanding the application range of anaerobic digestion.

Drawings

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

Fig. 1 is a schematic structural diagram of a biological sludge heating and pyrohydrolysis system in embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a biological sludge heating and pyrohydrolysis system in embodiment 2 of the present invention.

FIG. 3 is a schematic view showing the structure of a thermal hydrolysis reactor in example 2 of the present invention.

FIG. 4 is a schematic structural diagram of a biological sludge heating and pyrohydrolysis system in example 3 of the present invention.

FIG. 5 is a schematic view showing the structure of a thermal hydrolysis reactor in example 3 of the present invention.

FIG. 6 is a schematic structural diagram of a biological sludge heating and pyrohydrolysis system in example 4 of the present invention.

FIG. 7 is a schematic structural diagram of a biological sludge heating and pyrohydrolysis system in example 5 of the present invention.

FIG. 8 is a schematic structural diagram of a biological sludge heating and pyrohydrolysis system in example 6 of the present invention.

FIG. 9 is a schematic structural view of a biological sludge heating and pyrohydrolysis system in example 7 of the present invention.

FIG. 10 is a schematic structural diagram of a biological sludge heating and pyrohydrolysis system in example 8 of the present invention.

FIG. 11 is a schematic structural view of a biological sludge heating and pyrohydrolysis system in example 9 of the present invention.

Illustration of the drawings:

1. a material preheater; 2. a material transfer pump; 3. a primary steam ejector; 4. a material reservoir; 5. a feed pump; 6. a thermal hydrolysis reactor; 61. a spiral deflector; 62. an oblique guide plate; 63. a vertical flow deflector; 64. a partition plate; 65. a material inlet; 66. a material outlet; 7. a secondary steam ejector; 71. a steam conveying pipe is arranged outside; 72. an external steam injection pipe; 73. a steam conveying pipe is arranged inside; 74. a steam injection hole; 75. a power mechanism; 751. a motor; 752. a transmission wheel set; 753. a bearing; 76. a vapor diffusion tube; 77. a vapor diffusion hole; 78. a spiral conveying plate; 8. a discharge pump; 9. a steam flash evaporator; 10. a pressure relief valve; a. high-pressure steam; b. biological sludge, c, thermal hydrolysis concentrated solution.

Detailed Description

The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.

Example 1

The utility model provides a biological sludge heating and pyrohydrolysis system, as shown in figure 1, includes material preheater 1, material delivery pump 2, one-level steam ejector 3, material accumulator 4, charge pump 5, pyrohydrolysis reactor 6, discharge pump 8, steam flash vessel 9 and relief valve 10 with pipeline end to end intercommunication in proper order to and still include the second grade steam ejector 7 that is arranged in carrying out the heating to biological sludge in the pyrohydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes an external steam delivery pipe 71 and at least one external steam injection pipe 72, one end of the external steam injection pipe 72 is communicated with the external steam delivery pipe 71, and the other end is communicated with the pyrohydrolysis reactor 6.

In this embodiment, the pyrohydrolysis reactor 6 is a horizontally arranged cylinder structure, the biological sludge enters the pyrohydrolysis reactor 6 from the material inlet 65 of the pyrohydrolysis reactor 6 through the feed pump 5, and the biological sludge is discharged from the material outlet 66 after pyrohydrolysis is completed and is conveyed to the steam flash evaporator 9 through the discharge pump 8.

In this embodiment, the input amount and the output amount of the biological sludge in the thermal hydrolysis reactor 6 are effectively controlled by controlling the feed pump 5 and the discharge pump 8, and the biological sludge can be driven to transfer in the thermal hydrolysis reactor 6 by the high-pressure steam sprayed from the external steam spraying pipe 72.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

In this embodiment, the biological sludge is preheated in the material preheater 1, and the preheated biological sludge is continuously delivered to the primary steam ejector 3 by the material delivery pump 2. The high-pressure steam and the biological sludge are fully mixed in the primary steam ejector 3, the biological sludge is subjected to primary heating by utilizing the heat of the high-pressure steam in the mixing process, and the obtained heated biological sludge is stored in the material storage 4. Biological sludge in the material storage 4 is continuously conveyed to the thermal hydrolysis reactor 6 by the feeding pump 5, high-pressure steam is continuously sprayed into the thermal hydrolysis reactor 6 by the secondary steam sprayer 7, the biological sludge is heated secondarily by the heat of the high-pressure steam, so that the biological sludge can reach the temperature required by thermal hydrolysis more quickly, the biological sludge in the thermal hydrolysis reactor 6 is vigorously stirred by the high-pressure steam sprayed at high speed, the biological sludge can be fully mixed in a short time and quickly reach the temperature required by thermal hydrolysis, and finally the biological sludge completes thermal hydrolysis in the thermal hydrolysis reactor 6. The pressure in the thermal hydrolysis reactor 6 and the residence time of the biological sludge are controlled by a discharge pump 8. After the completion of pyrohydrolysis, the feed liquid after pyrohydrolysis is continuously conveyed to the steam flash evaporator 9 through the discharge pump 8, the feed liquid in the steam flash evaporator 9 is flashed through the control pressure release valve 10, so that gas and liquid in the feed liquid are effectively separated, wherein the low-pressure steam obtained by flashing is continuously conveyed to the material preheater 1 through the pressure release valve 10 to preheat biological sludge, and the obtained pyrohydrolysis concentrated solution is discharged from the bottom of the steam flash evaporator 9 and is treated through a corresponding subsequent treatment process, so that the continuous treatment of the biological sludge is realized.

In this embodiment, this biological sludge heating and pyrohydrolysis system is equipped with one-level steam ejector 3, adopt one-level steam ejector 3 with high-pressure steam and biological mud intensive mixing, utilize high-pressure steam's heat to carry out the one-level heating to biological mud, can strengthen the heat transfer effect, make biological mud can heat to about 100 ℃ fast, can reduce steam consumption, be favorable to reducing treatment cost, and mix high-pressure steam and biological mud, can strengthen the mixing effect, one-level steam ejector 3 can obviously improve mixing efficiency and heat transfer efficiency between biological mud and the steam promptly, reduce heating time and steam quantity. The biological sludge heating and pyrohydrolysis system is provided with a material storage 4 for storing the biological sludge heated by the primary steam ejector 3, and the material storage 4 occupies a smaller area. On the basis, the biological sludge heating and pyrohydrolysis system is also provided with a secondary steam ejector 7 for heating biological sludge in the pyrohydrolysis reactor 6, in particular to a secondary steam ejector 7 for continuously conveying high-pressure steam into the pyrohydrolysis reactor 6 to carry out secondary heating on the biological sludge, wherein the secondary steam ejector 7 comprises an external steam conveying pipe 71 and at least one external steam ejecting pipe 72, and the high-pressure steam is ejected into the pyrohydrolysis reactor 6 at high speed through the external steam conveying pipe 71 and the at least one external steam ejecting pipe 72, so that the heating effect on the biological sludge can be enhanced by using the heat of the high-pressure steam, the heat transfer effect on the biological sludge is better, the biological sludge can quickly reach the temperature required by pyrohydrolysis, the biological sludge in the pyrohydrolysis reactor 6 can be fully pyrolyzed in a short time, and the mixing effect of the biological sludge can be enhanced by using the high-pressure steam ejected at high speed, the energy required by stirring and mixing is reduced, the uniformity of heating of the biological sludge is enhanced, so that the thermal hydrolysis effect is enhanced, meanwhile, the high-pressure steam sprayed at high speed can promote the flow of the biological sludge in the thermal hydrolysis reactor 6, and finally, organic substances, particularly organic substances which are difficult to degrade, in the biological sludge are efficiently hydrolyzed into small molecular substances, such as organic acid, soluble organic substances and the like, which can be effectively utilized by microorganisms, so that the purposes of improving the thermal hydrolysis effect, reducing the treatment cost and the like are achieved. In addition, this biological sludge heating and pyrohydrolysis system is equipped with charge pump 5 and discharge pump 8, through controlling charge pump 5 and discharge pump 8, can effective control pyrohydrolysis reactor 6 in biological sludge's input and output quantity, be favorable to improving the stability of continuous heating, pyrohydrolysis and flash distillation, and be favorable to improving treatment effeciency. The biological sludge heating and pyrohydrolysis system has the advantages of good heat transfer effect, good material heating uniformity, small steam consumption, short heating time, good continuous operation stability and the like, can be widely used for degrading biological sludge (such as biogas residues, activated sludge and the like), can realize effective degradation of the biological sludge, and has good application value and application prospect.

Example 2

A biological sludge heating and thermal hydrolysis system is shown in figures 2 and 3 and comprises a material preheater 1, a material delivery pump 2, a primary steam ejector 3, a material storage 4, a feeding pump 5, a thermal hydrolysis reactor 6, a discharging pump 8, a steam flash evaporator 9 and a pressure release valve 10 which are sequentially communicated end to end through pipelines, and further comprises a secondary steam ejector 7 for heating biological sludge in the thermal hydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes an external steam delivery pipe 71 and at least one external steam injection pipe 72, one end of the external steam injection pipe 72 is communicated with the external steam delivery pipe 71, and the other end is communicated with the pyrohydrolysis reactor 6.

In this embodiment, the pyrohydrolysis reactor 6 is a horizontally arranged cylindrical structure, and a spiral guide plate 61 is arranged in the pyrohydrolysis reactor 6. In this embodiment, the biological sludge entering the thermal hydrolysis reactor 6 is guided by the spiral guide plate 61, so that the material heating uniformity is improved, the transmission effect of the biological sludge in the thermal hydrolysis reactor 6 is improved, and the treatment efficiency of the biological sludge can be improved.

In this embodiment, the biological sludge enters the thermal hydrolysis reactor 6 from the material inlet 65 of the thermal hydrolysis reactor 6 through the feed pump 5, and is discharged from the material outlet 66 after thermal hydrolysis is completed and is conveyed to the steam flash evaporator 9 through the discharge pump 8.

In this embodiment, the input amount and the output amount of the biological sludge in the thermal hydrolysis reactor 6 are effectively controlled by controlling the feed pump 5 and the discharge pump 8, and the biological sludge can be driven to transfer in the thermal hydrolysis reactor 6 by the high-pressure steam sprayed from the external steam spraying pipe 72.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

Example 3

A biological sludge heating and thermal hydrolysis system is shown in figures 4 and 5 and comprises a material preheater 1, a material delivery pump 2, a primary steam ejector 3, a material storage 4, a feeding pump 5, a thermal hydrolysis reactor 6, a discharging pump 8, a steam flash evaporator 9 and a pressure release valve 10 which are sequentially communicated end to end through pipelines, and further comprises a secondary steam ejector 7 for heating biological sludge in the thermal hydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes an external steam delivery pipe 71 and at least one external steam injection pipe 72, one end of the external steam injection pipe 72 is communicated with the external steam delivery pipe 71, and the other end is communicated with the pyrohydrolysis reactor 6.

In this embodiment, the thermal hydrolysis reactor 6 is a horizontally arranged cylinder structure, and an inclined flow guide plate 62 is arranged in the thermal hydrolysis reactor 6. In this embodiment, the biological sludge entering the thermal hydrolysis reactor 6 can improve the heat transfer efficiency of the biological sludge in the thermal hydrolysis reactor 6 by virtue of the guiding function of the oblique guide plate 62, and improve the heating uniformity of the biological sludge, thereby improving the thermal hydrolysis efficiency of the biological sludge.

In this embodiment, the biological sludge enters the thermal hydrolysis reactor 6 from the material inlet 65 of the thermal hydrolysis reactor 6 through the feed pump 5, and is discharged from the material outlet 66 after thermal hydrolysis is completed and is conveyed to the steam flash evaporator 9 through the discharge pump 8.

In this embodiment, the input amount and the output amount of the biological sludge in the thermal hydrolysis reactor 6 are effectively controlled by controlling the feed pump 5 and the discharge pump 8, and the biological sludge can be driven to transfer in the thermal hydrolysis reactor 6 by the high-pressure steam sprayed from the external steam spraying pipe 72.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

Example 4

The utility model provides a biological sludge heating and pyrohydrolysis system, as shown in figure 6, includes material preheater 1, material delivery pump 2, one-level steam ejector 3, material accumulator 4, charge pump 5, pyrohydrolysis reactor 6, discharge pump 8, steam flash vessel 9 and relief valve 10 with pipeline end to end intercommunication in proper order to and still include the second grade steam ejector 7 that is arranged in carrying out the heating to biological sludge in the pyrohydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes an external steam delivery pipe 71 and at least one external steam injection pipe 72, one end of the external steam injection pipe 72 is communicated with the external steam delivery pipe 71, and the other end is communicated with the pyrohydrolysis reactor 6.

In this embodiment, the thermal hydrolysis reactor 6 is a horizontally arranged cylinder structure, and a vertical guide plate 63 is arranged in the thermal hydrolysis reactor 6. In this embodiment, the biological sludge entering the thermal hydrolysis reactor 6 can improve the heat transfer efficiency of the biological sludge in the thermal hydrolysis reactor 6 by means of the guiding function of the oblique vertical guide plate 63, and improve the heating uniformity of the biological sludge, thereby improving the thermal hydrolysis efficiency of the biological sludge.

In this embodiment, the thermal hydrolysis reactor 6 has a horizontally disposed cylindrical structure. The biological sludge enters a thermal hydrolysis reactor 6 through a feeding pump 5, and is conveyed to a steam flash evaporator 9 through a discharging pump 8 after thermal hydrolysis is finished.

In this embodiment, the input amount and the output amount of the biological sludge in the thermal hydrolysis reactor 6 are effectively controlled by controlling the feed pump 5 and the discharge pump 8, and the biological sludge can be driven to transfer in the thermal hydrolysis reactor 6 by the high-pressure steam sprayed from the external steam spraying pipe 72.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

Example 5

The utility model provides a biological sludge heating and pyrohydrolysis system, as shown in figure 7, includes material preheater 1, material delivery pump 2, one-level steam ejector 3, material accumulator 4, charge pump 5, pyrohydrolysis reactor 6, discharge pump 8, steam flash vessel 9 and relief valve 10 with pipeline end to end intercommunication in proper order to and still including being arranged in carrying out the second grade steam ejector 7 that heats biological sludge in the pyrohydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes a built-in steam delivery pipe 73, one end of the built-in steam delivery pipe 73 is installed at the side end of the pyrohydrolysis reactor 6, the other end of the built-in steam delivery pipe 73 extends into the pyrohydrolysis reactor 6, and the built-in steam delivery pipe 73 is provided with a steam injection hole 74.

In this embodiment, the built-in steam delivery pipe 73 is fixedly installed at the side end of the thermal hydrolysis reactor 6. The thermal hydrolysis reactor 6 is a horizontally arranged cylinder structure, a separation baffle plate 64 is arranged in the thermal hydrolysis reactor 6, the separation baffle plate 64 is arranged above the built-in steam conveying pipe 73, and a steam jet hole 74 is arranged below the two separation baffle plates 64. In this embodiment, through setting up a plurality of partition baffle 64, divide into a plurality of space that is littleer with pyrohydrolysis reactor 6, simultaneously because the below between two partition baffle 64 is equipped with steam jet orifice 74, therefore can further improve the homogeneity of being heated and the heat transfer rate of feed liquid in pyrohydrolysis reactor 6 to make quick effectual completion pyrohydrolysis reaction of feed liquid more.

In the embodiment, the biological sludge enters the thermal hydrolysis reactor 6 through the feeding pump 5, and is conveyed to the steam flash evaporator 9 through the discharging pump 8 after thermal hydrolysis is completed.

In this embodiment, the input and output of the biological sludge in the thermal hydrolysis reactor 6 are effectively controlled by controlling the feed pump 5 and the discharge pump 8, and the high-pressure steam ejected from the steam ejection holes 74 can drive the biological sludge to be transferred in the thermal hydrolysis reactor 6.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

Example 6

The utility model provides a biological sludge heating and pyrohydrolysis system, as shown in figure 8, includes material preheater 1, material delivery pump 2, one-level steam ejector 3, material accumulator 4, charge pump 5, pyrohydrolysis reactor 6, discharge pump 8, steam flash vessel 9 and relief valve 10 with pipeline end to end intercommunication in proper order to and still include the second grade steam ejector 7 that is arranged in carrying out the heating to biological sludge in the pyrohydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes a built-in steam delivery pipe 73, one end of the built-in steam delivery pipe 73 is installed at the side end of the pyrohydrolysis reactor 6, the other end of the built-in steam delivery pipe 73 extends into the pyrohydrolysis reactor 6, and the built-in steam delivery pipe 73 is provided with a steam injection hole 74.

In this embodiment, the built-in steam delivery pipe 73 is fixedly installed at the side end of the thermal hydrolysis reactor 6. At least one steam diffusion pipe 76 is communicated with the built-in steam conveying pipe 73, and the side wall of the steam diffusion pipe 76 is provided with a steam diffusion hole 77. In this embodiment, with built-in steam conveyer pipe 73 and the 45 intercommunication of steam diffusion pipe 76 slant, because pyrohydrolysis reactor 6 is the drum structure of level setting, steam diffusion pipe 76 distributes in biological mud, spout high-pressure steam into biological mud through steam diffusion hole 77 this moment, thereby further strengthen biological mud's heat transfer effect, it is more even to make biological mud be heated, evenly distributed's steam diffusion hole 77 can improve biological mud's mass transfer effect simultaneously, thereby make the persistent organic matter in the biological mud hydrolyze into the micromolecule material that can be utilized by the microorganism more high-efficiently.

In this embodiment, the thermal hydrolysis reactor 6 has a horizontally disposed cylindrical structure. The biological sludge enters a thermal hydrolysis reactor 6 through a feeding pump 5, and is conveyed to a steam flash evaporator 9 through a discharging pump 8 after thermal hydrolysis is finished.

In this embodiment, the input and output of the biological sludge in the thermal hydrolysis reactor 6 are effectively controlled by controlling the feed pump 5 and the discharge pump 8, and the high-pressure steam ejected from the steam ejection holes 74 and the steam diffusion holes 77 can drive the biological sludge to be transferred in the thermal hydrolysis reactor 6.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

Example 7

The utility model provides a biological sludge heating and pyrohydrolysis system, as shown in figure 9, includes material preheater 1, material delivery pump 2, one-level steam ejector 3, material accumulator 4, charge pump 5, pyrohydrolysis reactor 6, discharge pump 8, steam flash vessel 9 and relief valve 10 with pipeline end to end intercommunication in proper order to and still include the second grade steam ejector 7 that is arranged in carrying out the heating to biological sludge in the pyrohydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes a built-in steam delivery pipe 73, one end of the built-in steam delivery pipe 73 is installed at the side end of the pyrohydrolysis reactor 6, the other end of the built-in steam delivery pipe 73 extends into the pyrohydrolysis reactor 6, and the built-in steam delivery pipe 73 is provided with a steam injection hole 74.

In this embodiment, the internal steam delivery pipe 73 is fixedly installed at the side end of the thermal hydrolysis reactor 6, and the internal steam delivery pipe 73 is provided with a spiral delivery plate 78. In this embodiment, the spiral conveying plate 78 is arranged on the built-in steam conveying pipe 73, and the guiding effect of the spiral conveying plate 78 is utilized to further improve the heating uniformity and the heat transfer rate of the feed liquid in the thermal hydrolysis reactor 6, so that the feed liquid can complete the thermal hydrolysis reaction more quickly and effectively.

In this embodiment, the thermal hydrolysis reactor 6 has a horizontally disposed cylindrical structure. The biological sludge enters a thermal hydrolysis reactor 6 through a feeding pump 5, and is conveyed to a steam flash evaporator 9 through a discharging pump 8 after thermal hydrolysis is finished.

In this embodiment, the pressure difference between the inlet and the outlet of the thermal hydrolysis reactor 6 is effectively controlled by controlling the feed pump 5 and the discharge pump 8, and the spiral conveying plate 78 is driven to rotate by the pressure difference, so as to further promote the transfer of the biological sludge in the thermal hydrolysis reactor 6, and simultaneously, the high-pressure steam sprayed from the steam spraying holes 74 can drive the transfer of the biological sludge in the thermal hydrolysis reactor 6.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

Example 8

The utility model provides a biological sludge heating and pyrohydrolysis system, as shown in figure 10, includes material preheater 1, material delivery pump 2, one-level steam ejector 3, material accumulator 4, charge pump 5, pyrohydrolysis reactor 6, discharge pump 8, steam flash vessel 9 and relief valve 10 with pipeline end to end intercommunication in proper order to and still include the second grade steam ejector 7 that is arranged in carrying out the heating to biological sludge in the pyrohydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes a built-in steam delivery pipe 73, one end of the built-in steam delivery pipe 73 is installed at the side end of the pyrohydrolysis reactor 6, the other end of the built-in steam delivery pipe 73 extends into the pyrohydrolysis reactor 6, and the built-in steam delivery pipe 73 is provided with a steam injection hole 74.

In this embodiment, the built-in steam delivery pipe 73 is rotatably installed at the side end of the thermal hydrolysis reactor 6, and the built-in steam delivery pipe 73 is connected to the external portion of the thermal hydrolysis reactor 6 with a power mechanism 75 for rotating the built-in steam delivery pipe 73, wherein the power mechanism 75 includes a motor 751, a transmission wheel set 752, and a bearing 753 installed at the end of the thermal hydrolysis reactor 6, the motor 751 is connected to the built-in steam delivery pipe 73 through a transmission wheel set 752, and the transmission wheel set 752 drives the built-in steam delivery pipe 73 to rotate under the support of the bearing 753. In this embodiment, built-in steam conveyer pipe 73 can be at 6 inside rotations of pyrohydrolysis reactor, and the steam jet orifice 74 that sets up on the built-in steam conveyer pipe 73 is utilized at the rotation in-process constantly spouts into high-pressure steam, stirs biological mud, not only can improve biological mud's heat transfer effect, also can improve biological mud's mass transfer effect to make biological mud can be more quick reach the pyrohydrolysis temperature, and further promote pyrohydrolysis efficiency and pyrohydrolysis effect.

In this embodiment, the built-in steam delivery pipe 73 is communicated with at least one steam diffusion pipe 76, the side wall of the steam diffusion pipe 76 is provided with a steam diffusion hole 77, and an included angle between the built-in steam delivery pipe 73 and the steam diffusion pipe 76 is 45 °, that is, the built-in steam delivery pipe 73 is communicated with the steam diffusion pipe 76 obliquely at 45 °. In this embodiment, the thermal hydrolysis reactor 6 is a horizontally arranged cylinder structure, the steam diffusion pipes 76 are distributed in the biological sludge, and at this time, high-pressure steam is sprayed into the biological sludge through the steam diffusion holes 77, so that the heat transfer effect of the biological sludge is further enhanced, the biological sludge is heated more uniformly, and meanwhile, the mass transfer effect of the biological sludge can be improved through the uniformly distributed steam diffusion holes 77, so that the refractory organic matters in the biological sludge are hydrolyzed into small molecular substances which can be utilized by microorganisms more efficiently. In particular, in this embodiment, the built-in steam delivery pipe 73 can rotate inside the thermal hydrolysis reactor 6, the biological sludge is stirred by the steam diffusion pipe 76 arranged on the built-in steam delivery pipe 73 during the rotation, and high-pressure steam is continuously sprayed through the steam spray holes 74 arranged on the built-in steam delivery pipe 73 and the steam diffusion holes 77 arranged on the steam diffusion pipe 76 during the rotation, so that not only can the heat transfer effect of the biological sludge be improved, but also the mass transfer effect of the biological sludge can be improved, the biological sludge can reach the thermal hydrolysis temperature more rapidly, and organic substances, particularly refractory organic substances in the biological sludge can be thermally hydrolyzed into small molecular substances, such as organic acid and soluble organic substances, which can be effectively utilized by microorganisms more efficiently.

In this embodiment, the thermal hydrolysis reactor 6 has a horizontally disposed cylindrical structure. The biological sludge enters a thermal hydrolysis reactor 6 through a feeding pump 5, and is conveyed to a steam flash evaporator 9 through a discharging pump 8 after thermal hydrolysis is finished.

In this embodiment, the input amount and the output amount of the biological sludge in the thermal hydrolysis reactor 6 are effectively controlled by controlling the feed pump 5 and the discharge pump 8, the biological sludge can be driven to transfer in the thermal hydrolysis reactor 6 by the high-pressure steam sprayed from the steam spraying holes 74 and the steam diffusion holes 77, and the biological sludge can be driven to transfer in the thermal hydrolysis reactor 6 by the rotation of the built-in steam conveying pipe 73.

In this example, a is steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

In this embodiment, the biological sludge is preheated in the material preheater 1, and the preheated biological sludge is continuously delivered to the primary steam ejector 3 by the material delivery pump 2. The high-pressure steam and the biological sludge are fully mixed in the primary steam ejector 3, the biological sludge is subjected to primary heating by utilizing the heat of the high-pressure steam in the mixing process, and the obtained heated biological sludge is stored in the material storage 4. Utilize charge pump 5 to carry the biological mud in the material reservoir 4 to thermal hydrolysis reactor 6 in succession, spout high-pressure steam in succession in the thermal hydrolysis reactor 6 through second grade steam ejector 7 simultaneously, utilize the heat of high-pressure steam to carry out the second grade heating to biological mud, make biological mud reach the required temperature of thermal hydrolysis more fast, and the high-pressure steam that spouts at a high speed also can make the biological mud in thermal hydrolysis reactor 6 take place violent stirring, the rotation of built-in steam conveyer pipe 73 also can strengthen the effect of being heated and the mass transfer effect of biological mud simultaneously, thereby make biological mud can fully mix in short time and reach the required temperature of thermal hydrolysis fast, final biological mud accomplishes the thermal hydrolysis in thermal hydrolysis reactor 6. The pressure in the thermal hydrolysis reactor 6 and the residence time of the biological sludge are controlled by a discharge pump 8. After the completion of the pyrohydrolysis, the feed liquid after the pyrohydrolysis is continuously conveyed to the steam flash evaporator 9 through the discharge pump 8, the feed liquid in the steam flash evaporator 9 is subjected to flash evaporation through the control pressure release valve 10, so that gas and liquid in the feed liquid are effectively separated, wherein low-pressure steam obtained by flash evaporation is continuously conveyed to the material preheater 1 through the pressure release valve 10 to preheat biological sludge, and the obtained pyrohydrolysis concentrated solution is discharged from the bottom of the steam flash evaporator 9 and is treated through a corresponding subsequent treatment process, so that the continuous treatment of the biological sludge is realized.

In this embodiment, this biological sludge heating and pyrohydrolysis system is equipped with one-level steam ejector 3, adopt one-level steam ejector 3 with high-pressure steam and biological mud intensive mixing, utilize high-pressure steam's heat to carry out the one-level heating to biological mud, can strengthen the heat transfer effect, make biological mud can heat to about 100 ℃ fast, can reduce steam consumption, be favorable to reducing treatment cost, and mix high-pressure steam and biological mud, can strengthen the mixing effect, one-level steam ejector 3 can obviously improve mixing efficiency and heat transfer efficiency between biological mud and the steam promptly, reduce heating time and steam quantity. The biological sludge heating and pyrohydrolysis system is provided with a material storage 4 for storing the biological sludge heated by the primary steam ejector 3, and the material storage 4 occupies a smaller area. On the basis, the biological sludge heating and pyrohydrolysis system is also provided with a secondary steam ejector 7 for carrying out secondary heating on the biological sludge in the pyrohydrolysis reactor 6, in particular to a secondary steam ejector 7 for continuously conveying high-pressure steam to carry out secondary heating on the biological sludge in the pyrohydrolysis reactor 6, wherein the secondary steam ejector 7 comprises a built-in steam conveying pipe 73 and a steam jet hole 74 arranged on the built-in steam conveying pipe 73, the high-pressure steam is sprayed into the pyrohydrolysis reactor 6 at high speed through the built-in steam conveying pipe 73 and the steam jet hole 74, the heating effect on the biological sludge can be enhanced by utilizing the heat of the high-pressure steam, the heat transfer effect on the biological sludge is better, the biological sludge can quickly reach the temperature required by pyrohydrolysis, and the biological sludge in the pyrohydrolysis reactor 6 can be fully hydrolyzed in a short time, the high-pressure steam sprayed at high speed can also be used for enhancing the mixing effect of the biological sludge, reducing the energy required by stirring and mixing and being beneficial to enhancing the heating uniformity of the biological sludge, so that the thermal hydrolysis effect is enhanced, meanwhile, the high-pressure steam sprayed at high speed and the rotation of the built-in steam conveying pipe 73 can also promote the flow of the biological sludge in the thermal hydrolysis reactor 6, and finally, organic substances, particularly refractory organic substances in the biological sludge are efficiently hydrolyzed into small molecular substances such as organic acid, soluble organic substances and the like which can be effectively utilized by microorganisms, so that the aims of improving the thermal hydrolysis effect, reducing the treatment cost and the like are fulfilled. In addition, this biological sludge heating and pyrohydrolysis system is equipped with charge pump 5 and discharge pump 8, through controlling charge pump 5 and discharge pump 8, can effective control pyrohydrolysis reactor 6 in biological sludge's input and output quantity, be favorable to improving the stability of continuous heating, pyrohydrolysis and flash distillation, and be favorable to improving treatment effeciency. The biological sludge heating and pyrohydrolysis system has the advantages of good heat transfer effect, good material heating uniformity, small steam consumption, short heating time, good continuous operation stability and the like, can be widely used for degrading biological sludge (such as biogas residues, activated sludge and the like), can realize effective degradation of the biological sludge, and has good application value and application prospect.

Example 9

The utility model provides a biological sludge heating and pyrohydrolysis system, as shown in figure 11, includes material preheater 1, material delivery pump 2, one-level steam ejector 3, material accumulator 4, charge pump 5, pyrohydrolysis reactor 6, discharge pump 8, steam flash vessel 9 and relief valve 10 with pipeline end to end intercommunication in proper order to and still include the second grade steam ejector 7 that is arranged in carrying out the heating to biological sludge in the pyrohydrolysis reactor 6.

In this embodiment, the secondary steam injector 7 includes a built-in steam delivery pipe 73, one end of the built-in steam delivery pipe 73 is installed at the side end of the pyrohydrolysis reactor 6, the other end of the built-in steam delivery pipe 73 extends into the pyrohydrolysis reactor 6, and the built-in steam delivery pipe 73 is provided with a steam injection hole 74.

In this embodiment, the built-in steam delivery pipe 73 is rotatably installed at the side end of the thermal hydrolysis reactor 6, and the built-in steam delivery pipe 73 is connected to the external portion of the thermal hydrolysis reactor 6 with a power mechanism 75 for rotating the built-in steam delivery pipe 73, wherein the power mechanism 75 includes a motor 751, a transmission wheel set 752, and a bearing 753 installed at the end of the thermal hydrolysis reactor 6, the motor 751 is connected to the built-in steam delivery pipe 73 through a transmission wheel set 752, and the transmission wheel set 752 drives the built-in steam delivery pipe 73 to rotate under the support of the bearing 753. In this embodiment, built-in steam conveyer pipe 73 can be at 6 inside rotations of pyrohydrolysis reactor, and steam is constantly spouted into to the steam jet orifice 74 that sets up on the rotation in-process utilizes built-in steam conveyer pipe 73, stirs biological mud, not only can improve biological mud's heat transfer effect, also can improve biological mud's mass transfer effect to make biological mud can be more quick reach the pyrohydrolysis temperature, and further promote pyrohydrolysis efficiency and pyrohydrolysis effect.

In this embodiment, the spiral conveying plate 78 is arranged on the built-in steam conveying pipe 73, and the guiding effect of the spiral conveying plate 78 is utilized to further improve the heating uniformity and the heat transfer rate of the feed liquid in the thermal hydrolysis reactor 6, so that the feed liquid can complete the thermal hydrolysis reaction more quickly and effectively. Meanwhile, in the embodiment, the built-in steam delivery pipe 73 can rotate inside the thermal hydrolysis reactor 6, the biological sludge is stirred by the aid of the spiral delivery plate 78 arranged on the built-in steam delivery pipe 73 in the rotating process, and high-pressure steam is continuously sprayed through the steam spraying holes 74 arranged on the built-in steam delivery pipe 73 in the rotating process, so that the heat transfer effect and the mass transfer effect of the biological sludge can be improved, the biological sludge can reach the thermal hydrolysis temperature more quickly, and organic substances, particularly organic substances which are difficult to degrade in the biological sludge, can be thermally hydrolyzed into small molecular substances which can be effectively utilized by microorganisms, such as organic acid, soluble organic substances and the like.

In this embodiment, the thermal hydrolysis reactor 6 has a horizontally disposed cylindrical structure. The biological sludge enters a thermal hydrolysis reactor 6 through a feeding pump 5, and is conveyed to a steam flash evaporator 9 through a discharging pump 8 after thermal hydrolysis is finished.

In this embodiment, the pressure difference between the inlet and the outlet of the thermal hydrolysis reactor 6 is effectively controlled by controlling the feed pump 5 and the discharge pump 8, the transfer of the biological sludge in the thermal hydrolysis reactor 6 is driven by the pressure difference, the transfer of the biological sludge in the thermal hydrolysis reactor 6 is driven by the high-pressure steam sprayed from the steam spraying holes 74 and the steam diffusion holes 77, and the transfer of the biological sludge in the thermal hydrolysis reactor 6 is driven by the rotation of the built-in steam delivery pipe 73.

In this example, a is high pressure steam, b is biological sludge, and c is a concentrated solution of thermal hydrolysis.

Example 10

A biological sludge heating and pyrohydrolysis process, which heats and pyrohydrolyzes biological sludge using the biological sludge heating and pyrohydrolysis system of example 9, specifically using a continuous operation, comprising the steps of:

s1, preheating biological sludge (the biological sludge is activated sludge and comes from a municipal sewage treatment plant) in the material preheater 1.

S2, conveying the biological sludge preheated in the step S1 to the primary steam ejector 3 by the material conveying pump 2, fully mixing high-pressure steam and the biological sludge in the primary steam ejector 3, performing primary heating on the biological sludge by the high-pressure steam, and storing the obtained biological sludge in the material storage 4.

S3, continuously conveying the biological sludge in the material storage 4 to the thermal hydrolysis reactor 6 by using the feed pump 5, and simultaneously continuously conveying high-pressure steam to the thermal hydrolysis reactor 6 by using the secondary steam ejector 7 to carry out secondary heating on the biological sludge, so that the temperature of the biological sludge rapidly reaches the thermal hydrolysis temperature (180 ℃), and the biological sludge undergoes thermal hydrolysis reaction in the thermal hydrolysis reactor 6. In the step, the pressure, the temperature and the retention time of the thermal hydrolysis process are effectively controlled by controlling the discharging pump 8.

S4, continuously conveying the feed liquid subjected to thermal hydrolysis in the step S3 to a steam flash evaporator 9 by using a discharge pump 8, simultaneously carrying out flash evaporation on the feed liquid in the steam flash evaporator 9 by controlling a pressure release valve 10 to obtain low-pressure steam and a thermal hydrolysis concentrated solution, returning the obtained low-pressure steam to the step S1 to preheat the biological sludge in the material preheater 1, and discharging the obtained thermal hydrolysis concentrated solution for subsequent treatment to finish the continuous treatment of the biological sludge.

In this embodiment, utilize one-level steam ejector 3 and second grade steam ejector 7 to carry out twice heating to biological mud, make the biological mud in the pyrohydrolysis reactor 6 quick, effectual completion pyrohydrolysis, can make the quick, the effectual completion flash distillation of feed liquid in the steam flash vessel 9 through control charge pump 5, discharge pump 8 and relief valve 10 simultaneously, make the effective separation of gas-liquid in the feed liquid to the realization is to biological mud's continuous processing.

In this embodiment, the hot hydrolyzed concentrated solution obtained by the flash evaporation in the step S4 can be subjected to the subsequent processing by any of the following methods.

The first method is as follows: and cooling the thermal hydrolysis concentrated solution to 35-55 ℃, and sending the solution to a primary anaerobic digestion tank for primary anaerobic digestion.

The second method comprises the following steps: and cooling the thermal hydrolysis concentrated solution to 35-55 ℃, and sending the thermal hydrolysis concentrated solution to a secondary anaerobic digestion tank for secondary anaerobic digestion.

The third method comprises the following steps: and (3) carrying out solid-liquid separation on the thermal hydrolysis concentrated solution, dehydrating and drying the obtained solid to obtain an organic fertilizer, and conveying the obtained liquid serving as a raw material for producing the methane to a primary anaerobic digestion tank or a secondary anaerobic digestion tank.

In summary, the biological sludge heating and pyrohydrolysis system of the present invention is provided with the primary steam ejector 3 and the secondary steam ejector 7, wherein the primary steam ejector 3 can rapidly heat the biological sludge to about 100 ℃ by mixing the high pressure steam and the biological sludge, so as to realize primary heating (primary heating) of the biological sludge. On the basis, the secondary steam ejector 7 continuously heats the biological sludge for the second time (secondary heating) by utilizing the high-pressure steam, so that the biological sludge can be fully mixed in a short time and quickly reaches the temperature required by thermal hydrolysis, and the introduction mode of the high-pressure steam is optimized by changing the communication mode between the secondary steam ejector 7 and the thermal hydrolysis reactor 6, so that the retention time of the biological sludge in the thermal hydrolysis reactor 6 can be effectively controlled, and the thermal hydrolysis reaction is ensured to be completed in a short time. The combined action of the primary steam ejector 3 and the secondary steam ejector 7 in the biological sludge heating and thermal hydrolysis system can obviously improve the mixing and heat transfer efficiency between the biological sludge and the high-pressure steam, and can also obviously reduce the time required by heating and the use amount of the high-pressure steam, so that the biological sludge is quickly and effectively converted into small molecular substances which can be effectively utilized, and the purposes of improving the thermal hydrolysis effect, reducing the treatment cost and the like are achieved. Meanwhile, the structure of the thermal hydrolysis reactor 6 is optimized, and the stirring effect of the injected high-pressure steam on the biological sludge is enhanced by optimizing the positions of the steam injection pipe and the nozzle or arranging a separation baffle plate 64 in the reactor, so that the heat transfer efficiency is enhanced, and the heating uniformity and the thermal hydrolysis effect are further improved. In addition, the biological sludge heating and thermal hydrolysis system is provided with the feed pump 5 and the discharge pump 8, and the input quantity and the output quantity of the biological sludge in the thermal hydrolysis reactor 6 can be effectively controlled by controlling the feed pump 5 and the discharge pump 8, so that the stability of continuous heating, thermal hydrolysis and flash evaporation is improved. Therefore, the biological sludge heating and pyrohydrolysis system has the advantages of good heat transfer effect, good material heating uniformity, small steam consumption, short heating time, good continuous operation stability and the like, can be widely used for degrading organic pollutants (such as biogas residues, activated sludge and the like), can realize effective degradation of organic pollutants, particularly organic pollutants which are difficult to degrade, and has good application value and application prospect, and meanwhile, can solve the problems of poor heat transfer effect, uneven material heating, large steam consumption, long heating time, poor continuous operation stability and the like in the prior art. The biological sludge heating and pyrohydrolysis process can realize intermittent operation and continuous operation by utilizing the biological sludge heating and pyrohydrolysis system for heating and pyrohydrolysis, has the advantages of simple process, convenience in operation, low treatment cost, high treatment efficiency, good pyrohydrolysis effect and the like, and is beneficial to improving the utilization rate of biological sludge and expanding the application range of anaerobic digestion.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.

Claims (5)

1. A biological sludge heating and pyrohydrolysis system is characterized by comprising a material preheater (1), a material conveying pump (2), a primary steam ejector (3), a material storage (4), a feeding pump (5), a pyrohydrolysis reactor (6), a discharging pump (8), a steam flash evaporator (9) and a pressure release valve (10) which are sequentially communicated end to end through pipelines; the thermal hydrolysis reactor (6) is of a horizontally arranged cylindrical structure; the biological sludge heating and pyrohydrolysis system further comprises a secondary steam ejector (7) for heating the biological sludge in the pyrohydrolysis reactor (6); the secondary steam ejector (7) comprises a built-in steam conveying pipe (73), one end of the built-in steam conveying pipe (73) is arranged at the side end of the pyrohydrolysis reactor (6), and the other end of the built-in steam conveying pipe (73) extends into the pyrohydrolysis reactor (6); the built-in steam delivery pipe (73) is provided with a steam jet hole (74);

the built-in steam conveying pipe (73) is rotatably arranged at the side end of the thermal hydrolysis reactor (6); the built-in steam conveying pipe (73) and the outside of the thermal hydrolysis reactor (6) are connected with a power mechanism (75) for rotating the built-in steam conveying pipe (73); the power mechanism (75) comprises a motor (751) and a transmission wheel set (752), and the motor (751) drives the built-in steam delivery pipe (73) to rotate through the transmission wheel set (752);

or the built-in steam conveying pipe (73) is fixedly arranged at the side end of the thermal hydrolysis reactor (6); the thermal hydrolysis reactor (6) is of a horizontally arranged cylindrical structure, at least one partition plate (64) is arranged in the thermal hydrolysis reactor (6), and the partition plate (64) is arranged above the built-in steam conveying pipe (73);

or the built-in steam conveying pipe (73) is fixedly arranged at the side end of the thermal hydrolysis reactor (6), at least one steam diffusion pipe (76) is communicated with the built-in steam conveying pipe (73), and steam diffusion holes (77) are formed in the side wall of each steam diffusion pipe (76);

or the built-in steam conveying pipe (73) is fixedly arranged at the side end of the thermal hydrolysis reactor (6), and a spiral conveying plate (78) is arranged on the built-in steam conveying pipe (73).

2. The biological sludge heating and pyrohydrolysis system according to claim 1, wherein when the internal steam delivery pipe (73) is rotatably installed at the side end of the pyrohydrolysis reactor (6), at least one steam diffusion pipe (76) is communicated with the internal steam delivery pipe (73); and the side wall of the steam diffusion pipe (76) is provided with steam diffusion holes (77).

3. The biological sludge heating and pyrohydrolysis system according to claim 1, wherein the internal steam delivery pipe (73) is rotatably installed at a side end of the pyrohydrolysis reactor (6), and the internal steam delivery pipe (73) is provided with a spiral delivery plate (78).

4. A biological sludge heating and pyrohydrolysis process, which is characterized in that the biological sludge heating and pyrohydrolysis process adopts the biological sludge heating and pyrohydrolysis system of any one of claims 1-3 for heating and pyrohydrolysis, and comprises the following steps:

s1, preheating the biological sludge in the material preheater (1);

s2, continuously conveying the biological sludge preheated in the step S1 to a primary steam ejector (3) by using a material conveying pump (2), performing primary heating on the biological sludge by using high-pressure steam, and storing the obtained biological sludge in a material storage (4);

s3, continuously conveying the biological sludge in the material storage (4) to a thermal hydrolysis reactor (6) by using a feed pump (5), and simultaneously continuously conveying high-pressure steam to the thermal hydrolysis reactor (6) by using a secondary steam ejector (7) to carry out secondary heating on the biological sludge to generate a thermal hydrolysis reaction;

s4, continuously conveying the feed liquid subjected to thermal hydrolysis in the step S3 to a steam flash evaporator (9) by using a discharge pump (8), simultaneously carrying out flash evaporation on the feed liquid in the steam flash evaporator (9) by controlling a pressure release valve (10) to obtain low-pressure steam and a thermal hydrolysis concentrated solution, returning the obtained low-pressure steam to the step S1 to preheat the biological sludge in the material preheater (1), and discharging the obtained thermal hydrolysis concentrated solution for subsequent treatment to finish the treatment of the biological sludge.

5. The biological sludge heating and pyrohydrolysis process as claimed in claim 4, wherein in step S1, the biological sludge is biogas residue and/or activated sludge;

in the step S4, the subsequent treatment of the thermal hydrolysis concentrated solution adopts any one of the following manners;

the first method is as follows: cooling the concentrated solution to 35-55 ℃, and sending the concentrated solution to a primary anaerobic digestion tank for primary anaerobic digestion;

the second method comprises the following steps: cooling the thermal hydrolysis concentrated solution to 35-55 ℃, and sending the thermal hydrolysis concentrated solution to a secondary anaerobic digestion tank for secondary anaerobic digestion;

the third method comprises the following steps: and (3) carrying out solid-liquid separation on the thermal hydrolysis concentrated solution, dehydrating and drying the obtained solid to obtain an organic fertilizer, and conveying the obtained liquid serving as a raw material for producing the methane to a primary anaerobic digestion tank or a secondary anaerobic digestion tank.

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