Sludge continuous hydrothermal carbonization system

Abstract

The utility model belongs to the field of common solid waste treatment, and particularly relates to a continuous hydrothermal carbonization system for sludge, which can uniformly heat the sludge and effectively improve the sludge treatment efficiency, and comprises a sludge storage tank, a preheating tank, a hydrothermal carbonization reactor and a flash tank which are arranged in sequence. A spiral pipeline is mounted in the hydrothermal carbonization reactor, one end of the spiral pipeline is connected with a preheating tank through a sludge inlet pipe, the other end of the spiral pipeline is connected with a flash tank, a steam distribution pipe extending into the pipe is mounted on the sludge inlet pipe, and the steam distribution pipe is connected with a steam generation device.

Description

Technical Field

[0001] The utility model belongs to the field of general solid waste treatment, and in particular relates to a sludge continuous hydrothermal carbonization system. Background Art

[0002] Hydrothermal carbonization technology was originally used in the research of materials science. With the continuous deepening of research on this technology, it has gradually been applied to the field of environmental protection. Since sludge contains varying amounts of organic matter, after hydrothermal carbonization treatment, sludge hydrothermal carbon with dense structure and stable performance can be obtained.

[0003] With the development of the sludge treatment industry, hydrothermal carbonization of sludge has gradually moved from small-scale and pilot-scale research to engineering applications. Traditional sludge hydrothermal carbonization is mostly batch-type, with relatively low efficiency. Continuous sludge hydrothermal carbonization needs to overcome the problems of uneven mixing of sludge and heating medium and uneven heating of sludge. Summary of the invention

[0004] In order to solve the problems of uneven heating of existing sludge and low treatment efficiency, the utility model provides a sludge continuous hydrothermal carbonization system, which can heat the sludge evenly and effectively improve the sludge treatment efficiency.

[0005] The technical solution is as follows: a sludge continuous hydrothermal carbonization system, which includes a sludge storage tank, a preheating tank, a hydrothermal carbonization reactor, and a flash tank arranged in sequence, characterized in that a spiral pipe is installed in the hydrothermal carbonization reactor, one end of the spiral pipe is connected to the preheating tank through a sludge inlet pipe, and the other end is connected to the flash tank, and a steam distribution pipe extending into the pipe is installed on the sludge inlet pipe, and the steam distribution pipe is connected to a steam generating device.

[0006] It is further characterized in that the end of the steam distribution pipe is a closed structure, an inclined steam baffle is arranged inside the steam distribution pipe, and a steam spray hole is opened on the side wall;

[0007] The flash tank and the preheating tank are provided with a steam return pipe;

[0008] A heat exchange tank and a solid-liquid separation device are sequentially arranged behind the flash tank, and the heat exchange tank is connected to a cold water tank and is connected to the jacket of the mud storage tank through a return pipe;

[0009] The solid-liquid separation device is a centrifuge or a plate and frame filter press.

[0010] After adopting the utility model, the preheated sludge and steam enter the spiral pipe in the hydrothermal carbonization reactor, and the temperature of the sludge rises rapidly, and then moves slowly along the spiral pipe. During the slow movement of high temperature and high pressure, the sludge is heated evenly, the organic matter in the sludge is partially hydrolyzed, and the sludge gradually forms hydrothermal carbon with stable properties, which effectively improves the sludge treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the utility model system;

[0012] Figure 2 It is a schematic diagram of the spiral pipeline in the hydrothermal carbonization reactor;

[0013] Figure 3 This is a schematic diagram of the steam distribution pipe extending into the sludge inlet pipe;

[0014] Figure 4 This is a schematic diagram of the steam distribution pipe structure. DETAILED DESCRIPTION

[0015] See Figures 1 to 4 As shown, a sludge continuous hydrothermal carbonization system comprises a sludge storage tank 1, a preheating tank 2, a hydrothermal carbonization reactor 3, a flash tank 4, a heat exchange tank 5 and a solid-liquid separation device 6 arranged in sequence. The solid-liquid separation device 6 is a centrifuge or a plate and frame filter press. A spiral pipe 9 is installed in the hydrothermal carbonization reactor 3. One end of the spiral pipe 9 is connected to the preheating tank 2 through a sludge inlet pipe 10, and the other end is connected to the flash tank 4. A steam distribution pipe 11 extending into the pipe is installed on the sludge inlet pipe 10, and the steam distribution pipe 11 is connected to a steam generating device 7.

[0016] The end of the steam distribution pipe 11 is a closed structure. An inclined steam baffle 12 is provided in the steam distribution pipe 11 and steam spray holes 13 are opened on the side wall, so that steam can be sprayed out from each steam spray hole 13 along the steam baffle to be fully mixed with the sludge.

[0017] The flash tank 4 and the preheating tank 2 are provided with steam return pipes; the heat exchange tank 5 is connected to the cold water tank 8 and is connected to the jacket of the mud storage tank 1 through the return pipe.

[0018] The jacket of the sludge storage tank 1 is filled with hot water from the heat exchange tank 5. Under the heating of the hot water, the sludge in the sludge storage tank 1 is preliminarily heated and transported by a screw pump or a plunger pump. The preliminarily heated sludge enters the preheating tank 2. The high-temperature steam from the flash tank 4 contacts the preliminarily heated sludge in the preheating tank 2. Under the stirring action, the sludge is heated for the second time and the temperature rises further. Through the slow operation of the plunger pump, the twice preheated sludge slowly enters the hydrothermal carbonization reactor 3. Before the spiral pipe inlet, the sludge is mixed with the high-temperature and high-pressure steam generated by the steam generator. The temperature of the sludge rises rapidly, and then it moves slowly along the spiral pipe. During the slow movement of high temperature and high pressure, the organic matter in the sludge is partially hydrolyzed, and the sludge gradually forms hydrothermal carbon with stable properties. After the sludge after hydrothermal carbonization enters the flash tank 4, the high-temperature steam in the gas phase and the mud-water mixture in the solid-liquid phase are separated, and the high-temperature steam returns to the front-end preheating tank 2. The high-temperature mud-water mixture enters the heat exchange tank 5 for heat exchange and cooling. The hot water after heat exchange in the heat exchange tank 5 returns to the front-end mud storage tank 1 for preliminary heating of the sludge. The cooled mud-water mixture enters the solid-liquid separation device 6, and through solid-liquid separation, solid sludge hydrothermal carbon and liquid filter press water are formed.

Claims

1. A sludge continuous hydrothermal carbonization system, comprising a sludge storage tank, a preheating tank, a hydrothermal carbonization reactor, and a flash tank arranged in sequence, characterized in that: A spiral pipe is installed in the hydrothermal carbonization reactor, one end of the spiral pipe is connected to the preheating tank through a sludge inlet pipe, and the other end is connected to the flash tank. A steam distribution pipe extending into the pipe is installed on the sludge inlet pipe, and the steam distribution pipe is connected to a steam generating device.

2. A sludge continuous hydrothermal carbonization system according to claim 1, characterized in that: The end of the steam distribution pipe is a closed structure, an inclined steam baffle is arranged inside the steam distribution pipe, and a steam spray hole is opened on the side wall.

3. A sludge continuous hydrothermal carbonization system according to claim 1, characterized in that: The flash tank and the preheating tank are provided with a steam return pipe.

4. A sludge continuous hydrothermal carbonization system according to claim 1, characterized in that: A heat exchange tank and a solid-liquid separation device are sequentially arranged behind the flash tank. The heat exchange tank is connected to a cold water tank and is connected to the jacket of the mud storage tank through a return pipe.

5. A sludge continuous hydrothermal carbonization system according to claim 4, characterized in that: The solid-liquid separation device is a centrifuge or a plate and frame filter press.

Images