Online cleaning and descaling device for heat exchange equipment in biodiesel production

Abstract

The utility model discloses an on-line cleaning and descaling device for heat exchange equipment in biodiesel production. A feeding manhole is formed in the top of a stainless steel liquid medicine tank, a glass liquid level meter is arranged on one side outside the tank, a dial thermometer is arranged on the other side outside the tank, a heating coil is arranged in the tank, a steam inlet pipe is provided with a steam inlet valve, the bottom of the tank is conical, and an outlet of the conical bottom is divided into two paths, one path is a discharge pipe with a discharge bottom valve, and the other path is connected with an inlet of a gear pump after being connected with a liquid medicine tank discharge valve and a Y-shaped filter; an outlet of the gear pump is divided into two paths, one path is a liquid medicine circulating pipe with a liquid medicine circulating valve, and the other path is connected to a heat exchanger water inlet pipe with a water inlet valve of the heat exchanger after being connected with a heat exchanger medicine washing feed valve; the heat exchanger water outlet pipe is divided into two paths, one path is a heat exchanger water outlet pipe with a water outlet valve, the other path is connected with a heat exchanger chemical washing water return valve and then converged with a chemical circulating pipe with a chemical circulating valve, and the converged pipeline passes through a flowmeter and then is connected back to the top of the stainless steel chemical tank. The device is simple and compact in structure, good in descaling and cleaning effect and convenient and efficient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary devices for biodiesel production, in particular to an on-line cleaning and descaling device for heat exchange equipment in biodiesel production. Background Art

[0002] In the production process of biodiesel, a large number of heat exchange devices are required to heat and cool materials such as methanol and crude biodiesel in production. Since the cooling water contains bicarbonate, and when the water temperature rises after heat transfer through the heat exchanger to the surface, the concentration of bicarbonate in the cooling water system increases with evaporation and concentration, and when the concentration reaches the supersaturated state, a calcification reaction is likely to occur. The carbonate scale deposits of these calcium and magnesium ions will precipitate on the surface of the heat exchanger and form a dense carbonate scale. After long-term use of these heat exchange devices, the continuously accumulated carbonate scale will gradually reduce the cooling water channel of the heat exchange device, resulting in a worse and worse heat exchange effect, affecting the production efficiency and production cost of biodiesel. Therefore, it is necessary to design and manufacture an on-line cleaning and descaling device for heat exchange equipment in biodiesel production that can effectively remove carbonate scale and is convenient and efficient in operation. Summary of the Invention

[0003] The purpose of the utility model is to provide an on-line cleaning and descaling device for heat exchange equipment in biodiesel production with a simple and compact structure, good descaling and cleaning effect, and convenient and efficient operation.

[0004] To achieve the above purpose, the on-line cleaning and descaling device for heat exchange equipment in biodiesel production of the utility model includes a stainless steel medicine tank 1, a dial thermometer 3, a heating coil 5, a glass level gauge 6, a Y-type filter 9, a gear pump 10, a flow meter 16 and a heat exchanger 17; a feeding manhole 2 is provided at the top of the stainless steel medicine tank 1, a glass level gauge 6 is installed on one side of the outer tank body, and a dial thermometer 3 is installed on the other side to realize the observation and control of the liquid level and temperature. A heating coil 5 is installed in the tank, and its steam inlet pipe is provided with a steam inlet valve 4. This tank is used for preparing descaling medicine, and its bottom is conical. The cone bottom outlet is divided into two paths. One path is a discharge pipe with a discharge bottom valve 7, and the other path is connected to the inlet of the gear pump 10 after connecting the medicine tank discharge valve 8 and the Y-type filter 9; the outlet of the gear pump 10 is divided into two paths. One path is a medicine circulation pipe with a medicine circulation valve 11, and the other path is connected to the heat exchanger inlet pipe with a heat exchanger water inlet valve 13 of the heat exchanger 17 after connecting the heat exchanger medicine washing feed valve 12; the outlet pipe of the heat exchanger 17 is divided into two paths. One path is a heat exchanger outlet pipe with a heat exchanger outlet valve 14, and the other path is connected to the medicine circulation pipe with a medicine circulation valve 11 after connecting the heat exchanger medicine washing return valve 15. The converging pipeline is connected to the top of the stainless steel medicine tank 1 after connecting the flow meter 16.

[0005] The descaling liquid medicine returns from the heat exchanger to the stainless steel liquid medicine tank 1 through the medicine washing return water valve 15 and the flowmeter 16; the flowmeter 16 is used to observe the liquid medicine flow rate, reflect the blockage of impurities in the pipeline, and judge whether slag removal operation is needed accordingly; the Y-shaped filter 9 installed at the inlet of the gear pump 10 can intercept falling scale and other impurities, which is beneficial to protecting the pump body and removing solid impurities.

[0006] The on-line cleaning and descaling device for heat exchange equipment in biodiesel production of the present utility model has the following technical characteristics and beneficial effects:

[0007] 1. By using this device and drugs, the dirt in the water circuit of the heat exchange equipment can be effectively cleaned, greatly improving the heat exchange effect of the equipment, enhancing the production efficiency and reducing the production cost;

[0008] 2. The whole medicine washing process is carried out in the medicine washing tank, pipeline and equipment. The on-line cleaning greatly reduces the labor intensity brought by manual cleaning operation and improves the cleaning and descaling operation rate;

[0009] 3. The device has a simple and compact structure, good descaling and cleaning effect, convenient and efficient operation, and wide application range. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the on-line cleaning and descaling device for heat exchange equipment in biodiesel production of the present utility model.

[0011] Reference numerals: stainless steel liquid medicine tank 1, feeding manhole 2, dial thermometer 3, steam inlet valve 4, heating coil 5, glass level gauge 6, discharge bottom valve 7, liquid medicine tank discharge valve 8, Y-shaped filter 9, gear pump 10, liquid medicine circulation valve 11, heat exchanger medicine washing inlet valve 12, heat exchanger water inlet valve 13, heat exchanger water outlet valve 14, heat exchanger medicine washing return water valve 15, flowmeter 16, heat exchanger 17. Detailed Description of the Invention

[0012] The following further details the on-line cleaning and descaling device for heat exchange equipment in biodiesel production of the present utility model in conjunction with the drawings and specific embodiments.

[0013] As Figure 1 shown, the on-line cleaning and descaling device for heat exchange equipment in biodiesel production of the present utility model includes a stainless steel liquid medicine tank 1, a dial thermometer 3, a heating coil 5, a glass level gauge 6, a DN50 Y-shaped filter 9, a 2.2KW gear pump 10, a flowmeter 16 and a heat exchanger 17; the tank top of the stainless steel liquid medicine tank 1 is provided with a feeding manhole 2, a glass level gauge 6 is installed on one side outside the tank body, and a dial thermometer 3 is installed on the other side to realize the observation and control of the liquid level and temperature. A heating coil 5 is installed in the tank, and its steam inlet pipe is provided with a steam inlet valve 4. This tank is used to prepare descaling liquid medicine, and its volume is 1.5M 3, the bottom is conical, and the cone bottom outlet is divided into two paths. One path is the discharge pipe with a discharge bottom valve 7, and the other path is connected to the inlet of a 2.2KW gear pump 10 after connecting the liquid medicine tank discharge valve 8 and a DN50 Y-type filter 9; the outlet of the gear pump 10 is divided into two paths. One path is the liquid medicine circulation pipe with a liquid medicine circulation valve 11, and the other path is connected to the heat exchanger inlet pipe with a heat exchanger water inlet valve 13 of the heat exchanger 17 after connecting the heat exchanger medicine washing feed valve 12; the outlet pipe of the heat exchanger 17 is divided into two paths. One path is the heat exchanger outlet pipe with a heat exchanger water outlet valve 14, and the other path is connected to the liquid medicine circulation pipe with a liquid medicine circulation valve 11 after connecting the heat exchanger medicine washing return valve 15. The converging pipeline is connected back to the top of the stainless steel liquid medicine tank 1 after connecting a flow meter 16.

[0014] The specific operation process of the on-line cleaning and descaling device for heat exchange equipment in the production of biodiesel of the present utility model is as follows:

[0015] 1. Before on-line chemical cleaning, first confirm that the heat exchanger is working properly, and both the heat exchanger water inlet valve 13 and the heat exchanger water outlet valve 14 are in the open state; confirm that the heat exchanger medicine washing feed valve 12 and the heat exchanger medicine washing return valve 15 are in the closed state, and check and confirm that the steam inlet valve 4 and the discharge bottom valve 7 are in the closed state;

[0016] 2. Open the heat exchanger medicine washing return valve 15, close the heat exchanger water outlet valve 14, inject water into the stainless steel liquid medicine tank 1, and observe the liquid level in the tank in real time through the glass liquid level gauge 6; when the preset liquid level is reached, open the heat exchanger water outlet valve 14, close the heat exchanger medicine washing return valve 15, and switch the heat exchanger back to the normal working state;

[0017] 3. Put the medicine into the stainless steel liquid medicine tank 1 from the feeding manhole 2 according to the set ratio;

[0018] 4. Open the liquid medicine tank discharge valve 8, open the liquid medicine circulation valve 11, and start the 2.2KW gear pump 10 to make the liquid medicine circulate and flow, playing a stirring role to promote the uniform dissolution of the medicine;

[0019] 5. Open the steam inlet valve 4, and the steam heats the liquid medicine in the tank to the set temperature through the heating coil 5 in the tank; the temperature of the liquid medicine in the tank can be observed in real time through the dial thermometer 3;

[0020] 6. When the liquid medicine in the tank is dissolved evenly and reaches the preset temperature, open the heat exchanger medicine washing feed valve 12, close the heat exchanger water inlet valve 13, open the heat exchanger medicine washing return valve 15, close the heat exchanger water outlet valve 14, and finally close the liquid medicine circulation valve 11. At this time, the system can be switched to the on-line chemical cleaning state to form a circulating on-line chemical cleaning;

[0021] 7. During the online medicine washing process, observe the medicine solution flow rate through the flow meter 16; when the flow rate significantly decreases, open the heat exchanger inlet valve 13, close the medicine washing feed valve 12 of the heat exchanger, open the heat exchanger outlet valve 14, close the medicine washing return valve 15 of the heat exchanger, and switch the heat exchanger back to the normal working state; turn off the 2.2KW gear pump 10, close the medicine washing tank discharge valve 8, and open the DN50 Y-type filter 9 for slag cleaning operation; after slag cleaning, switch back to online medicine washing according to step 6;

[0022] 8. After reaching the preset medicine washing time, open the heat exchanger inlet valve 13, close the medicine washing feed valve 12 of the heat exchanger, open the heat exchanger outlet valve 14, close the medicine washing return valve 15 of the heat exchanger, and switch the heat exchanger back to the normal working state; sequentially turn off the 2.2KW gear pump 10, close the medicine washing tank discharge valve 8, close the steam inlet valve 4, open the discharge bottom valve 7, and discharge the waste liquid into the designated recovery tank; after the medicine solution tank is emptied, it is ready for the next use.

Claims

1. An online cleaning and descaling device for heat exchange equipment in biodiesel production, comprising a stainless steel medicine tank (1), a dial thermometer (3), a heating coil (5), a glass level gauge (6), a Y-type filter (9), a gear pump (10), a flow meter (16) and a heat exchanger (17); the tank top of the stainless steel medicine tank (1) is provided with a feeding manhole (2), a glass level gauge (6) is installed on one side of the tank body, and a dial thermometer (3) is installed on the other side to achieve observation and control of liquid level and temperature, a heating coil (5) is installed in the tank, and a steam inlet valve (4) is provided on the steam inlet pipe of the tank. The tank is used for preparing descaling medicine, and its bottom is conical, and the cone bottom outlet is divided into two paths, one of which is a discharge bottom valve (7) The discharge pipe is a discharge pipe, and the other is connected to the inlet of the gear pump (10) after connecting the medicine tank discharge valve (8) and the Y-type filter (9); the outlet of the gear pump (10) is divided into two ways, one is a medicine circulation pipe with a medicine circulation valve (11), and the other is connected to the heat exchanger medicine washing feed valve (12) and connected to the heat exchanger water inlet pipe with a heat exchanger water inlet valve (13) of the heat exchanger (17); the outlet pipe of the heat exchanger (17) is divided into two ways, one is a heat exchanger water outlet pipe with a heat exchanger water outlet valve (14), and the other is connected to the heat exchanger medicine washing return valve (15) and merged with the medicine circulation pipe with the medicine circulation valve (11), and the merged pipe is connected to the flow meter (16) and then connected back to the tank top of the stainless steel medicine tank (1).

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