A device for suppressing the generation of flash steam and recovering heat

Abstract

The present invention discloses a device for inhibiting the generation of secondary flash steam and recovering heat, comprising a stirred reactor and a flash tank, wherein the discharge port of the stirred reactor is connected to the feed port of the flash tank, and further comprising a discharge tank, wherein the feed port of the discharge tank is connected to the discharge port of the flash tank, a heat conduction pipe c (31) is arranged in the inner cavity of the discharge tank, and a plurality of stirring blades are arranged in the discharge tank. By arranging a discharge tank at the rear end of the discharge port of the flash tank, materials in the flash tank that still have a certain temperature and pressure are discharged into the discharge tank for further cooling, thereby greatly reducing the residence time of the materials in the flash tank, thereby increasing the temperature and pressure reduction speed of the materials, shortening the discharge waiting time, and realizing mass production. The heat conduction pipe c (31) is arranged in the discharge tank to accelerate the cooling of the materials, and the heat displaced by the heat conduction pipe c (31) is connected to other standby heat links in the fertilizer making process to avoid waste of heat sources.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing fertilizers from hydrolyzed sludge, and particularly to a device for inhibiting the generation of secondary flash steam and recovering heat from high-temperature and high-pressure hydrolyzed sludge. Background Art

[0002] Currently, the main methods for treating urban sewage sludge widely used in China are: sanitary landfill, incineration, and composting. Due to the influence of factors such as economic development level, natural conditions, and traditional habits, it is difficult to have a unified model, but ultimately the treatment goal is harmlessness, stabilization, and resource utilization. In the traditional process of manufacturing fertilizers from hydrolyzed sludge, multiple stirring reaction kettles are usually connected to a flash tank. After the materials in the previous stirring reaction kettle reach room temperature and are discharged in the flash tank, the materials in the next stirring reaction kettle are loaded for flashing. In practice, since it takes a long time for the temperature and pressure in the flash tank to drop to normal temperature and pressure, especially the time required to cool from medium temperature to normal temperature accounts for the vast majority of the entire cooling time, that is, the cooling rate is slow and the time is long in the latter stage of the entire cooling process, resulting in the inability to achieve mass production of fertilizers. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for inhibiting the generation of secondary flash steam and recovering heat from high-temperature and high-pressure hydrolyzed sludge, so as to solve the defects of the above-mentioned prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A device for inhibiting the generation of secondary flash steam and recovering heat includes a stirring reaction kettle and a flash tank. The discharge port of the stirring reaction kettle is connected to the feed port of the flash tank, and further includes a discharge tank. The feed port of the discharge tank is connected to the discharge port of the flash tank. A heat conduction tube c is arranged in the inner cavity of the discharge tank, and a plurality of stirring blades are arranged in the discharge tank.

[0006] Further, a heat conduction tube b is arranged in the inner cavity of the flash tank.

[0007] Further, a heat conduction tube a is arranged on the outer wall of the stirring reaction kettle.

[0008] Further, a heat conduction tube d is arranged on the outer wall of the discharge tank.

[0009] Further, stop valves are arranged on the steam conduit of the flash tank, the connecting pipe between the discharge port of the stirring reaction kettle and the feed port of the flash tank, and the connecting pipe between the feed port of the discharge tank and the discharge port of the flash tank.

[0010] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0011] The device for suppressing the generation of secondary flash steam and recovering heat according to the present invention is provided with a discharge tank at the rear end of the discharge port of the flash tank, and the material in the flash tank with a certain temperature and pressure is discharged into the discharge tank for further cooling, thereby greatly reducing the residence time of the material in the flash tank, increasing the speed of temperature and pressure reduction of the material, shortening the discharge waiting time, realizing large-scale production, and a heat conduction tube c is arranged in the discharge tank to accelerate the cooling of the material. At the same time, the heat replaced by the heat conduction tube c is connected to other standby heat-using links in the fertilizer production process to avoid waste of heat sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 It is a schematic structural diagram of the present invention.

[0014] Marks in the drawings and corresponding component names:

[0015] 1 - Stirring reaction kettle, 11 - Heat conduction tube a, 2 - Flash tank, 21 - Heat conduction tube b, 22 - Steam conduit, 3 - Discharge tank, 31 - Heat conduction tube c, 33 - Heat conduction tube d. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0017] The following will further describe the present invention with reference to the drawings, but the protection scope of the present invention is not limited to the following.

[0018] Embodiment 1

[0019] As Figure 1 shown, a device for suppressing the generation of secondary flash steam and recovering heat includes a stirring reaction kettle 1 and a flash tank 2. The discharge port of the stirring reaction kettle 1 is connected to the feed port of the flash tank 2, and further includes a discharge tank 3. The feed port of the discharge tank 3 is connected to the discharge port of the flash tank 2. A heat conduction tube c (31) is arranged in the inner cavity of the discharge tank 3, and a plurality of stirring blades are arranged in the discharge tank 3.

[0020] By arranging a discharge tank 3 at the rear end of the discharge port of the flash tank 2, the material in the flash tank 2 that still has a certain temperature and pressure is discharged into the discharge tank 3 for further cooling, thereby greatly reducing the residence time of the material in the flash tank 2, increasing the speed of temperature and pressure reduction of the material, shortening the discharge waiting time, achieving large-scale production, and a heat conduction tube c (31) is arranged in the discharge tank 3 to accelerate the cooling of the material. At the same time, the heat replaced by the heat conduction tube c (31) is connected to other heat-using links in the fertilizer production process to avoid waste of heat sources.

[0021] Example 2

[0022] Based on Example 1, a heat conduction tube b (21) is arranged in the inner cavity of the flash tank 2, and the heat conduction tube b (21) is used to accelerate the reduction of the temperature and pressure of the material in the flash tank 2;

[0023] A heat conduction tube a (11) is arranged on the outer wall of the stirring reactor 1, and the heat conduction tube a (11) is used to heat the material in the stirring reactor 1;

[0024] A heat conduction tube d (33) is arranged on the outer wall of the discharge tank 3, and the heat conduction tube d (33) is used to assist in reducing the temperature of the material in the discharge tank 3.

[0025] Stop valves are arranged on the steam conduit 22 of the flash tank 2, the connecting pipe between the discharge port of the stirring reactor 1 and the feed port of the flash tank 2, and the connecting pipe between the feed port of the discharge tank 3 and the discharge port of the flash tank 2.

[0026] For the device for suppressing the generation of secondary flash steam and recovering heat of the present invention, by arranging a discharge tank 3 at the rear end of the discharge port of the flash tank 2, the material in the flash tank 2 that still has a certain temperature and pressure is discharged into the discharge tank 3 for further cooling, thereby greatly reducing the residence time of the material in the flash tank 2, increasing the speed of temperature and pressure reduction of the material, shortening the discharge waiting time, achieving large-scale production, and a heat conduction tube c (31) is arranged in the discharge tank 3 to accelerate the cooling of the material. At the same time, the heat replaced by the heat conduction tube c (31) is connected to other heat-using links in the fertilizer production process to avoid waste of heat sources.

[0027] The above specific embodiments have further detailed the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for suppressing the generation of secondary flash steam and recovering heat, comprising a stirring reaction kettle (1) and a flash tank (2), wherein the discharge port of the stirring reaction kettle (1) is connected to the feed port of the flash tank (2), and is characterized in that, It further includes a discharge tank (3), the feed inlet of the discharge tank (3) is connected to the discharge outlet of the flash evaporation tank (2), a heat conduction pipe c (31) is arranged in the inner cavity of the discharge tank (3), and a plurality of stirring paddle blades are arranged in the discharge tank (3); A heat conduction pipe b (21) is arranged in the inner cavity of the flash evaporation tank (2); A heat conduction pipe a (11) is arranged on the outer wall of the stirring reactor (1).

2. The device for suppressing the generation of secondary flash steam and recovering heat according to claim 1, wherein A heat conduction pipe d (33) is arranged on the outer wall of the discharge tank (3).

3. The device for suppressing the generation of secondary flash steam and recovering heat according to claim 1, characterized in that, Stop valves are arranged on the steam conduit (22) of the flash evaporation tank (2), the connecting pipe between the discharge outlet of the stirring reactor (1) and the feed inlet of the flash evaporation tank (2), and the connecting pipe between the feed inlet of the discharge tank (3) and the discharge outlet of the flash evaporation tank (2).

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