CN211394267U - Heat recovery preheating device for sludge treatment - Google Patents

Abstract

The utility model discloses a heat recovery preheating device for sludge treatment. A mixer is fixed on a sealing cover at the top of the container, a sludge storage tank is communicated with a feeding port on the sealing cover, and an outlet at the lower end of the sludge preheating device is connected. The material port is communicated with the mud inlet of the mud pump, the outer periphery of the container is provided with a heat insulation jacket, a closed chamber is formed between the heat insulation jacket and the outer wall of the container, and the closed chamber is provided with a heat recovery coil and is filled with a transmission tube. The heat medium, the coil inlet of the heat recovery coil is communicated with the thermal hydrolysis sludge outlet, and the coil outlet of the heat recovery coil leads to the pyrolysis sludge storage tank through the discharge pipe E. The heat recovery preheating device for sludge treatment of the utility model can utilize the residual heat of the thermally hydrolyzed sludge to preheat the sludge to be treated, which not only utilizes the residual heat of the thermally hydrolyzed sludge, but also can be used for thermal hydrolysis. After sludge cooling, energy saving and environmental protection. While preheating, it can also be stirred, which improves the degree of homogeneity and slurrying of the sludge, which is beneficial to the next thermal hydrolysis reaction.

Description

Heat recovery preheater for sludge treatment

technical field

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

Background technique

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

The harmless treatment of sludge has become a top priority for urban development. However, the sludge has complex composition, low calorific value and high water content. Only through pretreatment can the content of organic matter in the sludge be increased, the flow performance and dewatering performance of the sludge can be improved, and the subsequent anaerobic digestion efficiency can be effectively promoted.

At present, thermal hydrolysis of sludge is recognized as a simple and efficient sludge pretreatment method. Sludge thermal hydrolysis is to heat the sludge in a closed container under certain temperature and pressure conditions, so that the sludge flocs are disintegrated, the cells are ruptured, the organic matter is released, and the macromolecules are hydrolyzed. Settling properties, dewatering properties and biodegradability of sludge. The Chinese utility model patent with the application number of 201220058583.X discloses "a slurry reactor of a sludge hydrothermal drying treatment device", which records "a sludge hydrothermal drying treatment device". The mud water thermal drying treatment device includes a homogeneous reactor, a slurry reactor, a hydrothermal reactor and a flash reactor connected in sequence, and the tanks of the homogeneous reactor, the slurry reactor and the hydrothermal reactor are all uniform. A mixer is required. This kind of sludge hydrothermal drying treatment device has complex equipment structure, high cost and cumbersome process. Therefore, the heating is uneven, and the heat transfer efficiency is not high. At the same time, the hydrothermal reactor needs to be pressurized to a certain pressure by introducing steam to perform thermal hydrolysis. 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 deep dehydration drying incineration process", which improves the above-mentioned patent technical scheme. The preheating section 19, The heat medium spacer 7 is set on the outside of the sludge conveying pipe 3 of the reaction section 18 and the cooling section 17, and the heat medium spacer of the reaction section is communicated with the heat medium heating converter 9 to form the first circulation loop of heat medium , the heat medium spacer of the preheating section is communicated with the heat medium spacer of the cooling section to form the second circulation loop of the heat medium, and the heat medium heat recovery circulating pump 11 is arranged on the second circulation loop of the heat medium . The sludge conveying pipeline 3 is formed by splicing N (N≥3) conveying units end to end or integrally formed. The heat medium heating converter 9 is installed outside the heat preservation cabinet 6, which is beneficial to the temperature control of the whole device. The heat medium is heat transfer oil or steam or gas. Specifically, when the heat medium is gas, it can be flue gas, exhaust gas, or the like. The sludge feeding end of the sludge conveying pipeline is connected with a sludge conveying pump 2, and a pressure relief discharge valve 15 is connected after the reaction section of the sludge conveying pipeline. Although this kind of sludge continuous heat treatment modification device has made great progress, it still needs further improvement.

Utility model content

The purpose of this utility model is to provide a heat recovery preheating device for sludge treatment, which can use the waste heat of the thermally hydrolyzed sludge to preheat the sludge to be treated, which not only utilizes the waste heat of the thermally hydrolyzed sludge, but also It can cool the sludge after thermal hydrolysis, energy saving and environmental protection. While preheating, it can also be stirred, which improves the degree of homogeneity and slurrying of the sludge, which is beneficial to the next thermal hydrolysis reaction.

To achieve the above object, the utility model adopts the following technical solutions:

A heat recovery preheating device for sludge treatment, including a sludge preheating device, the sludge preheating device includes a container, a mixer is fixed on a sealing cover at the top of the container, and a sludge storage tank passes through a sludge feeding pipeline A. It is communicated with the feed port on the sealing cover, and the discharge port at the lower end of the sludge preheating device is communicated with the mud feed port of the mud pump. A closed chamber is formed between them. The closed chamber is provided with a heat recovery coil and is filled with a heat transfer medium. The coil outlet leads to the pyrolysis mud storage tank through the discharge pipe E.

Both the discharge pipe D and the discharge pipe E are provided with pressure relief devices.

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

The coil outlet of the heat recovery coil is communicated with the inlet of the pyrolysis mud storage tank through the heat exchanger.

Compared with the prior art, the beneficial effect of the present utility model is: adopting the above technical scheme, the outer periphery of the container is provided with a heat insulation jacket, and a closed chamber is formed between the heat insulation jacket and the outer wall of the container, and the closed chamber is equipped with There is a heat recovery coil and is filled with heat transfer medium, the coil inlet of the heat recovery coil is connected to the outlet of the thermally hydrolyzed sludge through the discharge pipe D, and the coil outlet of the heat recovery coil leads to the heat through the discharge pipe E. Desilting storage tank, this structure can use the waste heat of the thermally hydrolyzed sludge to preheat the sludge to be treated, which not only utilizes the waste heat of the thermally hydrolyzed sludge, but also can cool the sludge after thermal hydrolysis, Energy saving and environmental protection. While preheating, it can also be stirred, which improves the degree of homogeneity and slurrying of the sludge, which is beneficial to the next thermal hydrolysis reaction.

Description of drawings

Fig. 1 is the structural representation of the present utility model;

Fig. 2 is the structural representation that the utility model is applied to the sludge thermal hydrolysis system;

Fig. 3 is the structural representation of the sludge thermal hydrolysis pipeline in Fig. 2;

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

Detailed ways

In order to make the technical solution of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings 1 to 4 . It should be understood that the specific embodiments described in this specification are only for explaining the present invention, and not for limiting the protection scope of the present invention.

Example 1

The utility model is a heat recovery preheating device for sludge treatment, including a sludge preheating device 23, the sludge preheating device 23 includes a container, a mixer 6 is fixed on the sealing cover at the top of the container, and the sludge storage The tank 1 is communicated with the feeding port on the sealing cover through the mud feeding pipeline AG1, the discharging port at the lower end of the sludge preheating device 23 is communicated with the mud feeding port of the mud pump 7, and the outer periphery of the container is provided with a heat insulation clamp Sleeve 3, a closed chamber is formed between the thermal insulation jacket 3 and the outer wall of the container, the closed chamber is provided with a heat recovery coil 4 and is filled with a heat transfer medium 5, and the coil inlet of the heat recovery coil 4 passes through the discharge pipe DG2 is communicated with the thermal hydrolysis sludge outlet, and the coil outlet of the heat recovery coil 4 leads to the pyrolysis sludge storage tank 15 through the discharge pipeline EG3.

Preferably, both the discharge pipe DG2 and the discharge pipe EG3 are provided with a pressure releasing device 10 . The heat transfer medium 5 is heat-conducting oil, or molten salt, or water, and can also be directly wrapped and cast in the spacer with a metal with good heat-conducting performance, such as red copper. The coil outlet of the heat recovery coil 4 communicates with the inlet of the pyrolysis sludge storage tank 15 via the heat exchanger 12 .

Example 2

The present embodiment is a sludge thermal hydrolysis system comprising the above-mentioned heat recovery preheating device for sludge treatment:

A sludge thermal hydrolysis system, comprising a sludge storage tank 1 containing sludge to be treated, a sludge preheating device 23, a sludge transport pump 7, a steam source 13, and a pyrolysis sludge storage tank 15, characterized in that: A sludge thermal hydrolysis pipeline and a steam sludge ejector 8 are also provided, and the sludge outlet to be treated in the sludge storage tank 1 is communicated with the feed inlet of the sludge preheating device 23 through the sludge feeding pipeline AG1, and the sludge preheating device 23 is connected. The discharge port of the heat device 23 is communicated with the mud inlet of the mud pump 7, and the mud outlet of the mud pump 7 is communicated with the first inlet of the steam mud ejector 8 through the mud feeding pipeline BG4, and the steam supply port of the steam source 13 The steam supply pipeline CG5 is communicated with the second inlet of the steam sludge ejector 8, the outlet of the steam sludge ejector 8 is communicated with the inlet of the sludge thermal hydrolysis pipeline, and the thermally hydrolyzed sludge outlet of the sludge thermal hydrolysis pipeline is set There is a pressure release discharger 10, and the pressure release discharger 10 communicates with the coil inlet of the heat recovery coil 4 arranged in the thermal insulation jacket 3 on the outer periphery of the sludge preheating device 23 through the discharge pipe DG2, and the heat recovery The coil outlet of the coil 4 is communicated with the inlet of the pyrolysis mud storage tank 15 through the discharge pipe EG3 through the pressure relief discharger 10 and the heat exchanger 12 in turn. The bottom of the pyrolysis sludge storage tank 15 is provided with a thermally hydrolyzed sludge discharge pipe 22 leading to the anaerobic digestion equipment, and the top of the pyrolysis sludge storage tank 15 is provided with an exhaust pipe 21 . In order to avoid pollution to the atmosphere, the exhaust duct 21 leads to a deodorizing device.

Preferably, the sludge thermal hydrolysis pipeline is formed by connecting a plurality of cylindrical pipelines 9 with different inner diameters, and a heater 20 is provided at the connection part of at least one cylindrical pipeline 9 with a smaller inner diameter and a cylindrical pipeline 9 with a larger inner diameter. . The inner diameter of the cylindrical pipe 9 is 50-500 mm, and the outer circumference of the cylindrical pipe 9 is provided with a thermal insulation layer. A heat transfer medium 5 is contained in the heat insulating jacket 3 , and a mixer 6 is provided in the sludge preheating device 23 . The heater 20 is a steam heater, that is, an electronically controlled nozzle that directly injects steam into the pipeline along the moving direction of the sludge at this position. At this time, a sub-cylinder 14 is added on the steam supply pipeline CG5 of the steam source 13, The sub-cylinder 14 is divided into one steam to the electronically controlled nozzle; the steam-sludge injector 8 is a jet pump. A pressure sensor 16 , a temperature sensor 17 , a safety alarm 18 , and a flow sensor 19 are arranged on the corresponding pipeline. A plurality of cylindrical pipes 9 with different inner diameters are connected through an electric control valve 24 to form an array of reducing pipes.

In the above-mentioned schemes, steam refers to hot water vapor, and the thermal hydrolysis temperature is controlled at 110-225 ℃ (preferably 125-175 ℃), the pressure is 0.5-3Mpa (preferably 1-2.5MPa), and the reaction time is 0.1- After 1 hour (preferably 0.3-0.8 hours), the solid content of the sludge after thermal hydrolysis can reach more than 60% after mechanical dehydration. After thermal hydrolysis by the above sludge thermal hydrolysis system, the sludge enters the anaerobic digestion process, which can Shorten the biogas production cycle and improve the gas quality.

Preferably, in each of the above solutions, the pressure release and discharger 10 can also be arranged in stages according to the set pressure, so as to keep the temperature and pressure of the materials in the reducer array for continuous thermal hydrolysis of the sludge during the thermal hydrolysis process. Within the scope of process requirements, keep the discharge smooth. The pressure relief discharger 10 can be selected as a pressure relief discharge valve or a pressure relief valve.

Claims (4)

1. A heat recovery preheating device for sludge treatment, comprising a sludge preheating device (23), the sludge preheating device (23) comprising a container, and a mixer (6) is fixed on a sealing cover at the top of the container , the sludge storage tank (1) is communicated with the feed port on the sealing cover through the sludge feed conveying pipeline A (G1), and the discharge port at the lower end of the sludge preheating device (23) is connected to the sludge feed port of the sludge conveying pump (7). It is characterized in that: the outer periphery of the container is provided with a heat insulation jacket (3), a closed chamber is formed between the heat insulation jacket (3) and the outer wall of the container, and a heat recovery coil ( 4) and is filled with a heat transfer medium (5), the coil inlet of the heat recovery coil (4) is connected to the outlet of the thermally hydrolyzed sludge through the discharge pipe D (G2), and the coil of the heat recovery coil (4) The outlet leads to the pyrolysis sludge storage tank (15) through the discharge pipe E (G3). 2. The heat recovery preheating device for sludge treatment according to claim 1, characterized in that: a pressure relief discharger (10) is provided on both the discharge pipe D (G2) and the discharge pipe E (G3). ). 3 . The heat recovery preheating device for sludge treatment according to claim 2 , wherein the heat transfer medium ( 5 ) is heat transfer oil, or molten salt, or water, or solid metal. 4 . 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) passes through the heat exchanger (12) and the pyrolysis sludge storage tank (15) The inlet is connected.

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