CN211394267U

CN211394267U - Heat recovery preheating device for sludge treatment

Info

Publication number: CN211394267U
Application number: CN201922070012.2U
Authority: CN
Inventors: 童明; 彭如初; 郁聪; 郑卓峰; 王志刚; 陆建忠; 曹黎; 袁芳; 张俊昊; 孟云芳; 张健; 丁施佳; 陈俊宇; 钟军良; 张金泉
Original assignee: Huzhou Zhonghuan Water Co ltd; Zhejiang Lyuzhi Environmental Protection Technology Co ltd
Current assignee: Huzhou Zhonghuan Water Co ltd; Zhejiang Lyuzhi Environmental Protection Technology Co ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-09-01
Anticipated expiration: 2029-11-27

Abstract

The utility model discloses a sludge treatment's heat recovery preheating device, be fixed with the mixer on the sealed lid on its container top, mud storage tank and the sealed feed inlet intercommunication that covers, the discharge gate of mud preheating device lower extreme and the mud inlet intercommunication of defeated mud pump, the periphery of container is equipped with thermal-insulated clamp cover, constitute between this thermal-insulated clamp cover and the container outer wall and seal the cavity, it has the heat transfer medium to be equipped with the heat recovery coil pipe in the closed cavity and fill, the coil pipe entry and the thermal hydrolysis mud export intercommunication of heat recovery coil pipe, the coil pipe export of heat recovery coil pipe accesss to the pyrolysis mud storage tank through ejection of compact pipeline E. The utility model discloses a sludge treatment's heat recovery preheating device can utilize the waste heat of mud after the pyrohydrolysis to preheat treatment mud, has both utilized the waste heat of mud after the pyrohydrolysis, can give mud cooling after the pyrohydrolysis again, and is energy-concerving and environment-protective. The preheating and stirring can be carried out, the homogeneous reaction degree and the slurrying degree of the sludge are improved, and the next thermal hydrolysis reaction is facilitated.

Description

Heat recovery preheating device for sludge treatment

Technical Field

The utility model relates to a heat recovery preheating device for sludge treatment.

Background

In recent years, along with the rapid development of industrialization and urbanization, the amount of municipal sewage is also increased, which is harmful to our ecological environment and health.

The harmless treatment of the sludge becomes the urgent need for the development of cities. However, the sludge has complex components, low heat value and high water content, and the organic matter content in the sludge can be increased and the flowing property and the dehydration property of the sludge can be improved only by pretreatment, so that the subsequent anaerobic digestion efficiency can be effectively promoted.

At present, the thermal hydrolysis treatment of the sludge is a recognized simple and efficient sludge pretreatment method. The sludge thermal hydrolysis is to heat the sludge in a closed container under certain temperature and pressure conditions, so that sludge flocs are disintegrated, cells are broken, organic matters are released, hydrolysis macromolecules are hydrolyzed, and the settling property, the dehydration property and the biodegradation property of the sludge can be improved through thermal hydrolysis treatment. The chinese utility model patent with application number 201220058583.X discloses "a slurrying reactor of a sludge hydrothermal drying treatment device", which describes "a sludge hydrothermal drying treatment device", and the sludge hydrothermal drying treatment device comprises a homogenizing reactor, a slurrying reactor, a hydrothermal reactor and a flash evaporation reactor which are connected in sequence, and the tank bodies of the homogenizing reactor, the slurrying reactor and the hydrothermal reactor are all equipped with a stirrer. The sludge hydrothermal drying treatment device is complex in equipment structure, high in cost and complex in flow, particularly, the sludge cannot be fully mixed with steam and sludge only under the action of the stirrer in the hydrothermal reactor, so that the heating is uneven, the heat transfer efficiency is low, meanwhile, the hydrothermal reactor can be used for carrying out pyrohydrolysis only by introducing steam and pressurizing to a certain pressure, the sludge stays in the reaction tank for a long time, and the energy consumption is high.

The invention patent application with the application number of 201710601607.9 discloses a sludge continuous heat treatment modification device and a deep dehydration drying incineration process, which improves the technical scheme of the patent, wherein the sludge conveying pipelines 3 of a preheating section 19, a reaction section 18 and a cooling section 17 are all externally sleeved with heat medium partition sleeves 7, the heat medium partition sleeves of the reaction section are communicated with a heat medium heating converter 9 to form a heat medium first circulation loop, the heat medium partition sleeves of the preheating section are communicated with the heat medium partition sleeves of the cooling section to form a heat medium second circulation loop, and a heat medium heat recovery circulation pump 11 is arranged on the heat medium second circulation loop. The sludge conveying pipeline 3 is formed by splicing N (N is more than or equal to 3) conveying units end to end or integrally formed. The heat medium heating converter 9 is arranged outside the heat preservation case 6, and is beneficial to the temperature control of the whole device. The heat medium is heat conducting oil or steam or gas. Specifically, when the heat medium is gas, the heat medium may be flue gas, waste gas, or the like. The sludge inlet end of the sludge conveying pipeline is connected with a sludge conveying pump 2, and a pressure relief discharge valve 15 is connected behind the reaction section of the sludge conveying pipeline. Although great progress has been made in such a sludge continuous heat treatment modification apparatus, there is still a need for further improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sludge treatment's heat recovery preheating device can utilize the waste heat of mud after the pyrohydrolysis to preheat the mud of treating, has both utilized the waste heat of mud after the pyrohydrolysis, can give mud cooling after the pyrohydrolysis again, and is energy-concerving and environment-protective. The preheating and stirring can be carried out, the homogeneous reaction degree and the slurrying degree of the sludge are improved, and the next thermal hydrolysis reaction is facilitated.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a sludge treatment's heat recovery preheating device, includes sludge preheating device, sludge preheating device includes a container, and the sealed lid on container top is fixed with the mixer, and the mud storage tank is through advancing mud pipeline A and the sealed feed inlet intercommunication that covers, and the discharge gate of sludge preheating device lower extreme and the mud inlet intercommunication of mud pump, the periphery of container is equipped with thermal-insulated clamp cover, constitutes closed cavity between this thermal-insulated clamp cover and the container outer wall, is equipped with the heat recovery coil pipe in the closed cavity and fills and have heat transfer medium, and the coil pipe entry of heat recovery coil pipe passes through ejection of compact pipeline D and thermal hydrolysis mud export intercommunication, and the coil pipe export of heat recovery coil pipe leads to the pyrolysis mud storage tank through ejection of compact pipeline E.

Pressure relief devices are arranged on the discharge pipeline D and the discharge pipeline E.

The heat transfer medium is heat conduction oil, or molten salt, or water, or solid metal.

And the coil outlet of the heat recovery coil is communicated with the inlet of the pyrolysis sludge storage tank through a heat exchanger.

Compared with the prior art, the beneficial effects of the utility model are that: adopt above-mentioned technical scheme, the periphery of container is equipped with thermal-insulated clamp cover, constitute between this thermal-insulated clamp cover and the container outer wall and seal the cavity, it has heat transfer medium to be equipped with the heat recovery coil pipe in the closed cavity and fill, the coil pipe entry of heat recovery coil pipe passes through discharge tube D and thermal hydrolysis mud export intercommunication, the coil pipe export of heat recovery coil pipe leads to pyrolysis mud storage tank through discharge tube E, this kind of structure, the waste heat that can utilize mud after the thermal hydrolysis preheats the mud of treating, the waste heat of mud after the thermal hydrolysis has both been utilized, can be for the mud cooling after the thermal hydrolysis again, energy-concerving and environment-. The preheating and stirring can be carried out, the homogeneous reaction degree and the slurrying degree of the sludge are improved, and the next thermal hydrolysis reaction is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the sludge pyrohydrolysis system of the present invention;

FIG. 3 is a schematic view showing the structure of the sludge pyrohydrolysis line of FIG. 2;

FIG. 4 is a schematic diagram of the structure of a reducer array of a sludge pyrohydrolysis pipeline (the thickness of the sludge pyrohydrolysis pipeline is shown in the front row, and the thickness of the sludge pyrohydrolysis pipeline is omitted in the rear row).

Detailed Description

In order to make the technical solution of the present invention clearer, the following describes the present invention in detail with reference to fig. 1 to 4. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Example 1

The utility model relates to a sludge treatment's heat recovery preheating device, including sludge preheating device 23, sludge preheating device 23 includes a container, and the sealed lid on container top is fixed with mixer 6, and mud storage tank 1 is through advancing mud pipeline AG1 and sealed feed inlet intercommunication on covering, and the discharge gate of sludge preheating device 23 lower extreme and the mud inlet intercommunication of defeated mud pump 7, the periphery of container is equipped with thermal-insulated clamp cover 3, constitutes closed cavity between this thermal-insulated clamp cover 3 and the container outer wall, is equipped with heat recovery coil pipe 4 and packs in the closed cavity and has heat transfer medium 5, and heat recovery coil pipe 4's coil pipe entry passes through ejection of compact pipeline DG2 and thermal hydrolysis sludge outlet intercommunication, and thermal recovery coil pipe 4's coil pipe export accesss to thermal hydrolysis mud storage tank 15 through ejection of compact pipeline EG 3.

Preferably, a pressure relief device 10 is provided in each of the discharge line DG2 and the discharge line EG 3. The heat transfer medium 5 is heat transfer oil, or molten salt, or water, and can also be directly wrapped and cast in the spacer sleeve by metal with good heat conduction performance, such as red copper. The coil outlet of the heat recovery coil 4 is communicated with the inlet of the pyrolysis mud storage tank 15 through the heat exchanger 12.

Example 2

The embodiment is a sludge pyrohydrolysis system comprising the heat recovery preheating device for sludge treatment:

the utility model provides a mud pyrohydrolysis system, is including the mud storage tank 1 that the splendid attire remains to handle mud, mud preheating device 23, defeated mud pump 7, steam source 13, and pyrolysis mud storage tank 15, its characterized in that: a sludge thermal hydrolysis pipeline and a sludge injector 8 are also arranged, a sludge outlet to be treated in the sludge storage tank 1 is communicated with a feed inlet of the sludge preheating device 23 through a sludge inlet delivery pipeline AG1, a discharge outlet of the sludge preheating device 23 is communicated with a sludge inlet of the sludge conveying pump 7, a sludge outlet of the sludge conveying pump 7 is communicated with a first inlet of the sludge injector 8 through a sludge inlet delivery pipeline BG4, a steam supply port of a steam source 13 is communicated with a second inlet of the sludge injector 8 through a steam supply pipeline CG5, an outlet of the sludge injector 8 is communicated with an inlet of the sludge thermal hydrolysis pipeline, a pressure relief device 10 is arranged at a thermal hydrolysis sludge outlet of the sludge thermal hydrolysis pipeline, the pressure relief device 10 is communicated with a coil inlet of a thermal recovery coil 4 in a thermal insulation jacket 3 arranged at the periphery of the sludge preheating device 23 through a discharge pipeline DG2, and a coil outlet of the thermal recovery coil 4 sequentially passes through the pressure relief device 10, the pressure relief device 10 and the discharge pipeline EG3, The heat exchanger 12 communicates with an inlet port of the pyrolysis sludge storage tank 15. The bottom of the pyrolysis sludge storage tank 15 is provided with a pyrolysis sludge discharge pipeline 22 leading to anaerobic digestion equipment, and the top of the pyrolysis sludge storage tank 15 is provided with an exhaust pipeline 21. To avoid contamination of the atmosphere, the exhaust duct 21 leads to a deodorizing device.

Preferably, the sludge pyrohydrolysis line is formed by connecting a plurality of cylindrical lines 9 having different inner diameters, and a heater 20 is provided at a connection portion between at least one cylindrical line 9 having a smaller inner diameter and the cylindrical line 9 having a larger inner diameter. The inner diameter of the cylindrical pipeline 9 is 50-500 mm, and the periphery of the cylindrical pipeline 9 is provided with an insulating layer. The heat-insulating jacket 3 is filled with heat transfer medium 5, and the sludge preheating device 23 is internally provided with a stirrer 6. The heater 20 is a steam heater, that is, an electric control nozzle for directly introducing steam into the pipeline along the movement direction of the sludge at the position, at this time, a steam supply pipeline CG5 of the steam source 13 is additionally provided with a steam distributing cylinder 14, and the steam distributing cylinder 14 distributes steam to the electric control nozzle in one path; the steam-mud ejector 8 is a jet pump. The corresponding pipelines are provided with a pressure sensor 16, a temperature sensor 17, a safety alarm 18 and a flow sensor 19. The cylindrical pipelines 9 with different inner diameters are connected through an electric control valve 24 to form a reducing pipe array.

In each scheme, steam refers to hot steam, the thermal hydrolysis temperature is controlled to be 110-225 ℃ (preferably 125-175 ℃), the pressure is 0.5-3Mpa (preferably 1-2.5 MPa), the reaction time is 0.1-1 hour (preferably 0.3-0.8 hour), the solid content of sludge after thermal hydrolysis can reach more than 60% through mechanical dehydration, and the sludge after thermal hydrolysis of the sludge thermal hydrolysis system enters an anaerobic digestion process, so that the methane production period can be shortened, and the methane production quality can be improved.

Preferably, in each of the above embodiments, the pressure relief device 10 may be arranged in stages and sections according to a set pressure, so as to keep the temperature and the pressure of the material in the sludge continuous thermal hydrolysis reducer array within the process requirements during the thermal hydrolysis process, respectively, and keep the material relief smooth. The pressure relief device 10 can be selected from a pressure relief discharge valve or a pressure relief valve.

Claims

1. The utility model provides a sludge treatment's heat recovery preheating device, includes sludge preheating device (23), sludge preheating device (23) include a container, are fixed with mixer (6) on the sealed lid on container top, and mud storage tank (1) feeds through with the sealed feed inlet that covers through advancing mud pipeline A (G1), and the discharge gate of sludge preheating device (23) lower extreme and the mud inlet intercommunication of defeated mud pump (7), its characterized in that: the periphery of container is equipped with thermal-insulated clamp cover (3), constitutes closed cavity between this thermal-insulated clamp cover (3) and the container outer wall, is equipped with heat recovery coil pipe (4) in the closed cavity and fills and have heat transfer medium (5), and the coil pipe entry of heat recovery coil pipe (4) passes through discharge tube D (G2) and thermal hydrolysis mud export intercommunication, and the coil pipe export of heat recovery coil pipe (4) passes through discharge tube E (G3) and accesss to pyrolysis mud storage tank (15).

2. The heat recovery preheating device for sludge treatment according to claim 1, characterized in that: pressure relief devices (10) are arranged on the discharge pipeline D (G2) and the discharge pipeline E (G3).

3. The heat recovery preheating device for sludge treatment according to claim 2, characterized in that: the heat transfer medium (5) is heat conduction oil, or molten salt, or water, or solid metal.

4. The heat recovery preheating device for sludge treatment according to claim 2, characterized in that: the coil outlet of the heat recovery coil (4) is communicated with the inlet of the pyrolysis sludge storage tank (15) through a heat exchanger (12).