Solid-liquid separation tank for biomass hydrothermal conversion product

Abstract

The utility model relates to the field of biomass resource utilization, and discloses a solid-liquid separation tank for biomass hydrothermal conversion products, which comprises a tank body, an inflation inlet arranged on the tank body and a filter screen arranged in the tank body, and the filter screen divides the tank body into a first chamber and a second chamber which are arranged left and right; the upper part of the first chamber is provided with a feeding hole and a feeding valve through which hot conversion products enter, and the bottom of the first chamber is provided with a solid discharging hole and a solid discharging valve; an exhaust port and an exhaust valve are arranged at the upper part of the second chamber; and a liquid discharge port and a liquid discharge valve are arranged at the bottom of the second chamber. The solid-liquid separation tank disclosed by the utility model solves the problem that the solid-liquid separation of the existing hydrothermal conversion product needs to be cooled and depressurized, the separation efficiency can be improved, and the collected hot liquid can be reused in the hydrothermal conversion reaction, so that the energy recycling rate of a system is improved.

Description

Technical Field

[0001] The utility model relates to the field of biomass resource utilization, in particular to a solid-liquid separation tank for biomass hydrothermal conversion products. Background Art

[0002] Hydrothermal conversion is a thermochemical technology that can directly convert high-water-content biomass. It uses water as the reaction solvent, and is carried out at a temperature of 180-300°C and a pressure of 1-10MPa. During the hydrothermal conversion process, biomass undergoes a series of complex chemical reactions such as hydrolysis, dehydration, and decarboxylation, and is converted into solids, liquids, and a small amount of gas. The solid product is a biochar, which usually has a carbon content of >50%, has a high calorific value, rich groups, high porosity, and high surface charge, and is widely used as a fuel, adsorbent, soil conditioner, etc.

[0003] The traditional method of obtaining biochar requires waiting for the hydrothermal conversion reaction of biomass to be completed, and then opening the reactor after it drops to room temperature and pressure, taking out the solid and liquid products for filtration, centrifugation and other processes to finally obtain biochar. This process is not only time-consuming, but also wastes a lot of heat and pressure, resulting in high energy consumption and energy waste in the overall process. Utility Model Content

[0004] The utility model aims to provide a solid-liquid separation tank for biomass hydrothermal conversion products, so as to solve the problems of long time consumption, large waste of heat and pressure in the current biomass hydrothermal conversion product separation process.

[0005] To achieve the above object, the utility model provides a solid-liquid separation tank for biomass hydrothermal conversion products, comprising a tank body, an air filling port arranged on the tank body, and a filter screen arranged in the tank body, wherein the filter screen separates the tank body into a first chamber and a second chamber arranged on the left and right;

[0006] The upper part of the first chamber is provided with a feed inlet and a feed valve for the heat conversion product to enter, and the bottom of the first chamber is provided with a solid discharge port and a solid discharge valve;

[0007] An exhaust port and an exhaust valve are arranged at the upper portion of the second chamber, and a liquid discharge port and a liquid discharge valve are arranged at the bottom of the second chamber.

[0008] The above scheme provided by the utility model has the following characteristics: the tank body is divided into two chambers by a filter screen, the filtration is completed directly in the chamber, the pressure in the tank body is adjusted by the drain port, and the pressure in the tank body is used to first quickly discharge the liquid through the liquid discharge port and blow the residual liquid between the particles, and the heat provided by the high-temperature liquid can provide preheating for the reactants of the hydrothermal reaction, and then the liquid discharge valve is closed, and the solid discharge valve is opened, so that biochar is collected from the solid discharge port, and finally gas is filled into the tank body through the inflation port, and then the solid discharge valve is quickly opened to exhaust, and the airflow is used to impact the filter screen and the solid particles on the filter screen, thereby reducing the clogging problem of the filter screen.

[0009] Preferably, as an improvement, a liquid level gauge is also provided on the tank body, so as to facilitate the detection or observation of the liquid level in the tank body, so as to discharge the liquid and solid in the tank body in time.

[0010] Preferably, as an improvement, the solid discharge port is located higher than the liquid discharge port, and the bottom of the filter screen is equal to or lower than the solid discharge port, thereby facilitating the tank body to discharge the liquid first and then the solid, and reducing the liquid content in the solid.

[0011] Preferably, as an improvement, a temperature gauge and a pressure gauge are also provided on the tank body, so as to conveniently detect the temperature and pressure in the tank body, avoid unexpected liquid or solid injection during the opening of the valve, and ensure safe operation.

[0012] Preferably, as an improvement, the designed liquid level of the tank body does not exceed two-thirds of the maximum liquid level.

[0013] Preferably, as an improvement, an interception plate is hinged or suspended at the upper part of the second chamber, and the interception plate is close to one side of the filter screen; since it is located at the upper part of the second chamber and is hinged, it will not affect normal filtration. When discharging solids, the airflow in the second chamber pushes them toward the filter screen, thereby achieving its impact on the filter screen so that the particles fall off the filter screen. More importantly, its interception effect on the gas allows more airflow to pass through the middle and lower part of the filter screen while impacting, thereby taking the particles mainly located in the middle and lower part of the filter screen away from the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of Example 1 of the utility model. DETAILED DESCRIPTION

[0015] The following is further described in detail through specific implementation methods:

[0016] The figure marks in the drawings of the specification include: 1. feed valve; 2. solid particles; 3. solid discharge valve; 4. liquid discharge valve; 5. tank body; 6. liquid level gauge; 7. filter; 8. gas discharge valve; 9. charging valve; 10 pressure gauge; 11. temperature gauge; 12. interception plate.

[0017] This embodiment provides a solid-liquid separation tank for biomass hydrothermal conversion products, as shown in the attached Figure 1 As shown, the solid-liquid separation tank for the hydrothermal conversion product of biomass includes a tank body 5 and a filter screen 7 arranged in the tank body. The tank body 5 is provided with an air filling port and an air filling valve 9, a liquid level gauge 6, a thermometer 11 and a pressure gauge 10. The setting of the liquid level gauge 6 can facilitate the observation and detection of the liquid level in the tank body 5, so as to discharge the liquid and solid in the tank body 5 in time when the liquid reaches the set liquid level; the setting of the thermometer 11 and the pressure gauge 10 can facilitate the detection of the temperature and pressure in the tank body 5 to ensure safe operation.

[0018] The filter screen 7 separates the tank body into a first chamber and a second chamber arranged on the left and right; a feed port and a feed valve 1 for the heat conversion product to enter are arranged on the upper part of the first chamber, a solid discharge port and a solid discharge valve 3 are arranged on the bottom of the first chamber, and the first chamber is mainly used to accommodate the solid particles 2 intercepted by the filter screen 7, that is, biochar obtained by hydrothermal conversion of biomass; an exhaust port and a gas discharge valve 8 are arranged on the upper part of the second chamber, and a liquid discharge port and a liquid discharge valve 4 are arranged on the bottom of the second chamber. The liquid discharge port is mainly used to discharge the liquid product obtained by hydrothermal conversion of biomass. The preferred method is to connect the liquid discharge port to the reaction tank of the hydrothermal reaction, so that the material to be reacted can be heated by the liquid product.

[0019] The hydrothermal reaction usually uses a reaction tank as the reaction site, and the biomass materials used are straw, wood chips, and bamboo. The moisture content of the materials is usually 60%-99%. The temperature and pressure required for the hydrothermal reaction are usually less than 300°C and 10MPa. Therefore, the tank body 7 and other components in this embodiment can withstand a temperature of less than 300°C and a pressure of less than 10MPa. After the hydrothermal reaction, the conversion product enters the tank body 5 through the feed valve 1, wherein the solid particles are intercepted by the filter screen 7 and sink into the first chamber, and the liquid passes through the filter screen 7 and enters the second chamber. When the liquid in the tank exceeds When the set liquid level is exceeded, the set liquid level in this embodiment is preferably two-thirds of the total liquid level. First, close the feed valve 1, open the liquid discharge valve 4 to collect the liquid, then close the liquid discharge valve 4, open the solid discharge valve 3 to collect the solid particles, then close the solid discharge valve 3, open the inflation valve 9 to inflate the tank to a certain pressure (4-6MPa), and then suddenly open the solid discharge valve 3 to quickly release the gas, so as to use the airflow impact to clear the solids on the filter 7 to prevent blockage. After completion, close the solid discharge valve 3 again and open the feed valve 1.

[0020] In this embodiment, the position of the solid discharge port is higher than the liquid discharge port, and the bottom height of the filter screen is equal to or lower than the solid discharge port. Therefore, in the process of discharging the liquid from the tank body first, not only can the liquid in the second chamber be drained cleanly, but the liquid in the first chamber can also pass through the filter screen 7 under the action of gravity and enter the second chamber to be discharged together, thereby reducing the residual liquid in the solid product.

[0021] In addition, in the present embodiment, in order to better remove the biochar stuck on the filter 7 while discharging the biochar, an interception plate 12 is hinged or suspended at the upper part of the second chamber. The bottom height of the interception plate is preferably slightly higher than the maximum design liquid level of the tank body 5. The present embodiment adopts the method of suspending the interception plate, and makes the interception plate 12 close to the filter 7, so that under normal conditions, the filter 7 will not hinder the liquid from passing through the filter, and when discharging solids, the gas in the second chamber will push the interception plate 12 toward the filter 7, thereby achieving its beating and impacting the filter, so that the solid particles fall off the filter. The interception plate 12 in the present embodiment is preferably arranged in two pieces. The interception effect of the interception plate 12 on the gas can allow more airflow to pass through the middle and lower part of the filter while impacting, thereby taking the particles away from the filter. In fact, the particulate matter is mainly located in the middle and lower part of the filter.

[0022] The above is only an embodiment of the utility model, and the common sense such as the known specific technical scheme and / or characteristics in the scheme is not described too much here. It should be pointed out that for those skilled in the art, without departing from the technical scheme of the utility model, several deformations and improvements can be made, such as simply replacing the form of the temperature gauge and the pressure gauge, simply changing the position of the inflation port or the exhaust port, etc., which are all within the protection scope of the utility model. In the utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A solid-liquid separation tank for biomass hydrothermal conversion products, characterized in that: It comprises a tank body, an air filling port arranged on the tank body, and a filter screen arranged in the tank body, wherein the filter screen separates the tank body into a first chamber and a second chamber arranged on the left and right sides; The upper part of the first chamber is provided with a feed inlet and a feed valve for the heat conversion product to enter, and the bottom of the first chamber is provided with a solid discharge port and a solid discharge valve; An exhaust port and an exhaust valve are arranged at the upper portion of the second chamber, and a liquid discharge port and a liquid discharge valve are arranged at the bottom of the second chamber.

2. The solid-liquid separation tank according to claim 1, characterized in that: The position of the solid discharge port is higher than the liquid discharge port, and the bottom height of the filter screen is equal to or lower than the height of the solid discharge port.

3. The solid-liquid separation tank according to claim 1, characterized in that: The tank body is also provided with a liquid level gauge.

4. The solid-liquid separation tank according to claim 1, characterized in that: The tank body is also provided with a temperature gauge and a pressure gauge.

5. The solid-liquid separation tank according to claim 1, characterized in that: An interception plate is hinged or suspended on the upper part of the second chamber, and the interception plate is close to one side of the filter screen.

6. The solid-liquid separation tank according to claim 5, characterized in that: The bottom height of the intercepting plate is greater than or equal to the designed liquid level height of the tank body.

7. The solid-liquid separation tank according to claim 5, characterized in that: The designed liquid level of the tank body shall not exceed two-thirds of the maximum liquid level.

8. The solid-liquid separation tank according to claim 1, characterized in that: The liquid discharge port is connected to a reaction tank for hydrothermal reaction.

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