TW202233290A - Low-temperature filter press drying method and device for filter press machine capable of reducing the viscosity of the material to facilitate the filtering operation - Google Patents

Abstract

The invention relates to a filter press machine, on which a modular heating filter plate is equipped to introduce the hot fluid into the filter plate to heat the to-be-filtered material in the filter chamber, so as to reduce the viscosity of the material to facilitate the filtering operation. At the end of the filtering process of the filter press and dewatering operation, the filter chamber is evacuated and depressurized to reduce the evaporation temperature of the water body in the material, and the heat introduced by the filter plate is used to achieve the purpose of drying and dewatering the material in the filter chamber at a low temperature.

Description

Low temperature filter press drying method and device for filter press

The filter press is widely used in the solid-liquid separation process of fluid slurry in the industry, and it is a relatively inexpensive and mature technology.

If the material filtered by the filter press is moderately compressible or hydrophobic, generally speaking, the dehydration is good; if the filtered material is a highly shrinkable and hydrophilic material, its dehydration will be greatly reduced; if the filtered material is It is biological sludge, because it contains biological mucous membrane surface that easily adheres to water, and cannot be separated by general mechanical force. Even if the sludge is conditioned by coagulants first and then dewatered, the minimum moisture content of the dewatered cake is higher than 80 in practice. %, even if the pressure is applied for a long time, the water content cannot be reduced, which is not conducive to the rear-end disposal of the dewatered cake.

The conventional filter press has poor dewatering performance for highly compressible materials and hydrophilic colloids with small particle size, such as biological organic sludge. In view of the lack of the conventional device, the inventor hopes to provide an innovative device to improve the effect of the conventional device, and finally designs a low-temperature filter-press drying method and device for a filter press. During the filtration operation, heat is introduced into the filter plate of the traditional filter press, which reduces the viscosity of the material and facilitates the process of the filtration process, and stops the inflow of the material when the flow rate of the filtrate at the end of the pressure filtration process in the filter chamber reaches the minimum. In the dehydration process, the filter chamber is evacuated to reduce the evaporation temperature of water in the material in the filter chamber, and then the heat introduced into the filter plate is used to heat the material to evaporate and dehydrate the water to achieve the purpose of drying the material.

In order to enable your examiners to better understand the structural composition, principle, process, efficacy, implementation and features of the present invention, the following descriptions are given with the accompanying drawings.

As shown in Figure 1, the low temperature filter press drying device of the filter press of the present invention consists of a sludge thickening device (2), a conditioning tank (6), a heating filter press (37), a heating unit (13), and a vacuum generating unit (19) (20) (21) and vapor condensation units (18) (26) (27).

When assembled, the heating filter press (37) is used as the main body, a conditioning tank (6) is placed between the heating filter press (37) and the sludge thickening device (2), and the conditioning tank (6) is connected to the heating The unit (13) is provided with a conditioning tank heating pump (17) on the pipeline, and the conditioning tank (6) is connected to the pipeline to the heating filter press (37). The sludge thickening device (2) is connected with a pipeline to guide the filtrate (4) to the filtrate tank (29), and the thickened sludge (3) produced by the sludge thickening device (2) is discharged to the conditioning tank (6) by gravity; heating The filter press (37) is connected with the heating unit (13) by a pipeline, wherein the heat flow circulation pump (14) is connected to the heat of the modular heating filter plate (8) and the modular heating membrane filter plate (9). The fluid injection hole is then connected to the return pipe to guide the hot fluid (15) back to the heating unit (13), and the diaphragm back pressure pump (16) is connected to the back pressure injection hole of the heating diaphragm filter plate (9) to guide heat The pressure fluid (11) pressurizes the filter chamber; the filtrate (39) discharge line of the heated filter press (37) is connected with the condenser (18) and the filtrate tank (29), and the pipeline connected with the filtrate tank (29) A filtrate blocking valve (23) is provided, and a vapor blocking valve (22) is provided for the pipeline connected with the condenser (18); The separation tank (19), the gas-liquid separation tank (19) connects the pipeline to the condensate tank (20), the condensate bottom valve (24) is arranged between the gas-liquid separation tank (19) and the condensate tank (20), and the condensate tank (20) A condensate discharge valve (25) is arranged between the filtrate tank (29); a pipeline is arranged between the condenser (18) and the cooling water tank (26), and a cooling water circulating pump (28) is arranged on the pipeline to guide The cooling water enters the condenser (18) to perform the steam condensation operation, and the condenser (18) is then connected with the pipeline to the cooling tower (27). ), which constitutes a closed loop as a whole, and implements sludge press dewatering and drying procedures.

As shown in Figure 1, the sludge thickening device (1) of the low temperature filter press drying device of the present invention is a kind of coagulated sludge in which the sludge (2) is mixed with the conditioning agent to be easily dehydrated, and then mechanically Most of the free water in the sludge is removed and dehydrated into a high-concentration colloidal thickened sludge (3) that cannot flow. Screw dehydrators and other models.

The conditioning tank (6) is an empty tank with a built-in mixer and heating coil in the tank body. The concentrated sludge (3) is discharged into the conditioning tank (6). The mud pump (7) can pump and store the flowing colloidal sludge (38). The conditioning tank (6) and the heating filter press (7) are connected by a sludge pressure pump (7) and a pipeline. (6) It is connected with the heating unit (13) by a conditioning tank heating pump (7) and a pipeline to introduce a hot fluid (15) to heat the colloidal sludge (38) and then pressurize it into a heating filter press ( 37) Those who perform dehydration.

Heating filter press (37), built-in modular heating filter plate (8) and modular heating membrane filter plate (9), the two are arranged in a cross manner (for the filter plate type, please refer to Patent Application No. 110105241 ), the heating unit (13) and the modular heating filter plate group (8) (9) are connected by pipeline The sludge (38) is heated, the heating unit (13) and the modular heating membrane filter plate (9) are connected by a pipeline, and a membrane reverse pressure pump (14) is arranged on the pipeline to guide the hot fluid (15). The colloidal sludge (38) in the filter press is subjected to back pressure dewatering operation, and the two are connected with the pipeline to the filtrate tank (29) and the condenser (18), and the colloidal sludge (38) in the filter is dehydrated and dried to make the water content to a minimum;

The heating unit (13) is a built-in heating element and a hot fluid (15) in a storage tank, and the heat source can be electric energy, steam, etc., and the hot fluid (15) in the tank is heated and then introduced into the heating filter press (37) and the quenching and tempering tank (6) for heating.

The vacuum generating unit includes a vacuum pump (21), a gas-liquid separation tank (19), and a condensate tank (20). The vacuum pump (21) and the heating filter press (37) are connected by a filtrate discharge line. A condenser (18) is arranged on the line, a gas-liquid separation tank (19) is arranged between the condenser (18) and the vacuum pump (21), and a condensate tank (20) is arranged between the gas-liquid separation tank (19) and the filtrate tank (20). , to pump and store the filter chamber of the filter press into a negative pressure state, so that the water in the colloidal sludge (38) in the filter press can be evaporated at a low temperature by means of negative pressure, and the gas-liquid separation tank (19), condensation The liquid tank (19), which condenses the vapor produced by the condenser (18) into the liquid condensed water in the filter chamber is discharged.

The steam condensation unit includes a condenser (18), a cooling water tank (26) and a cooling cooling tower (27). A cooling water circulating pump (28) is arranged between the condenser (18) and the cooling water tank (26) to guide the cooling water into The condenser (18) cools the vapor flowing through it and condenses it into a liquid. The condenser (18) is connected with the cooling tower (27) by a pipeline, and the heated cooling water is introduced into the cooling tower (27) for heat dissipation. The heat absorbed in the condenser (18) is discharged, the cooling water temperature drops and flows into the cooling water tank (26), and then cooled The water circulation pump (28) is pressurized and injected into the condenser (18) to circulate and condense the water vapor generated by the heating filter chamber.

Generally, if the filtering material of the filter press type sludge dewatering machine is biological sludge, because the surface of the biological mucosa is easy to adhere to the water, it cannot be separated by ordinary mechanical force. The minimum moisture content of the cement cake is higher than 78%, and the moisture content cannot be reduced even if the pressure is applied for a long time, which is not conducive to the post-processing of the cement cake. Generally, the concentration of sludge in the concentration tank is about 1-2% after being treated by the wastewater treatment unit in the sewage treatment plant. If the dewatering operation is carried out by direct pressure injection, when the thickness of the mud cake in the filter chamber accumulates to about 2-3mm, it will form a mucous membrane that is not permeable to water. When the water permeability of the mud cake layer will be attenuated greatly, the filtrate will no longer be discharged when the mud cake accumulates to about 5mm. The operating factors that affect the dewatering operation of the filter press are sludge properties, sludge concentration and filtration pressure. The sludge properties can be used to add conditioning agents to flocculate micro-feather particles to form large conditioning sludge agglomerates. The free water can be quickly removed; in addition, the dewatering speed of sludge press filtration is proportional to the sludge concentration. When the sludge concentration is increased by n times, the dehydration time of the filter press can be shortened by about ²ⁿ times. In order to increase the sludge concentration before the filter press, the present invention adopts a sludge thickener (2) to concentrate the conditioned coagulated sludge by the sludge. The mechanical force of the device (2) dehydrates into a thickened sludge (3) that cannot flow, and then adds an appropriate amount of conditioning water (31) and stirs it into a colloidal sludge (38) that just flows. The moisture content happens to be that the colloidal sludge (38) can be pumped into the heated filter press (37) by the pressurized sludge pump (7); in addition, the viscosity of the colloidal sludge (38) will also affect the heated filter press. Therefore, while the fluidity of the thickened sludge (3) is adjusted in the conditioning tank (6), the colloidal sludge (38) in the conditioning tank (6) is heated to improve the flow of sludge The fluidity of water is conducive to filter press dehydration.

The colloidal sludge (38) after being quenched and tempered and heated up is pressurized by the pressurized sludge pump (7), and then injected into the heating filter press (37) to carry out the filter press dehydration operation, and the mold of the heating filter press (37) The group heating filter plate (8) (9) injects the hot fluid (15) to heat the colloidal sludge (38) in the filter chamber to maintain a constant temperature, and when the positive pressure operation is no longer discharged, stop the pressurized sludge pump ( 7) In operation, inject the hot fluid (15) into the modular heating membrane filter plate (9) to reversely squeeze the colloidal sludge (38) in the filter chamber with the expanded membrane to minimize the water content.

For pure biological sludge, the water content of mechanical pressing and dewatering has dropped to 78%, which has almost reached the limit and cannot be further reduced. At this time, the only way to reduce the water content is to change the application method of physical force. The present invention adopts the negative pressure low temperature heating and drying method to reduce the moisture content of the colloidal sludge (38) to the minimum. The evaporation temperature of water is proportional to the atmospheric pressure. When the pressure drops to 15kpa, the evaporation temperature of water drops to 54°C. In the present invention, the filter press is evacuated to reduce the pressure in the filter chamber to below 15kpa, and the modular heating filter plate ( 8) (9) Introduce a hot fluid (15) below 90°C to heat the colloidal sludge (38) in the filter chamber to evaporate the water into water vapor, and then be discharged by the vacuum pump (27) from the heating filter press (37) to reach the level of pollution. The purpose of drying and dehydration of mud.

The higher the vacuum degree of the filter chamber of the filter press, the lower the water evaporation temperature, the better the water-fighting effect. The vacuum degree depends on the exhaust volume of water vapor from the vacuum pump (21). The higher the exhaust volume, the better the vacuum degree. It is a simple and economical method to improve the vacuum degree of the filter chamber. The water vapor is firstly passed through the condensation process to reduce the water vapor content, and then the reduction of the vapor inlet flow under the condition that the exhaust volume of the vacuum pump (21) is constant will effectively improve and maintain the filter press. The vacuum pressure of the filter chamber.

The water vapor in the filter chamber is sucked by the vacuum pump (21) and passes through the condenser (18) to exchange heat with the low-temperature circulating cooling water inside. The water vapor temperature drops and condenses into condensed water in the gas-liquid separation tank (19). The steam is sucked by the vacuum pump (21) and discharged from the filter press, and the condensed water settles at the bottom of the gas-liquid separation tank (19) and is periodically discharged to the condensate tank (20) until a certain liquid level is accumulated in the condensate tank (20). Then it is discharged to the filtrate tank (29), and the cooling water temperature rises through the condenser (18) and then flows to the cooling cooling tower (27) for forced heat exchange with the atmosphere, and its calorific value is discharged into the atmosphere to make the cooling water temperature drop and flow back. The cooling water tank (26) flows to the condenser (18) to circulate the water vapor to condense the water, so as to achieve the purpose of completing the filter press dehydration and drying in a single filter press.

As shown in Figure 1, the present invention is used in the method of low temperature filter press drying of filter press, and the method comprises:

A sludge conditioning and thickening process, in which the sludge (1) is mixed with a coagulation agent in the sludge thickening device (2) to form a conditioning sludge that is easy to dewater, and the conditioning sludge is removed by the physical and mechanical force of the sludge thickening device (2). Most of the free water inside becomes a thickened sludge that cannot flow (3);

A sludge conditioning preheating process, the concentrated sludge (3) is discharged into the conditioning tank (6), mixed with a quantitative conditioning water (31), and then forced to flow by mechanical force to a rated moisture content The colloidal sludge (38) is synchronously heated by the hot fluid (15) of the heating unit (13) to heat the colloidal sludge (38), and then the sludge pressurized pump (7) is used to pressurize the heating pressure. The filter (37) performs the sludge dewatering operation;

1. Sludge pressure heating and dehydration process, the colloidal sludge (38) is injected into the heating filter press (37) under mechanical pressure for dehydration. 29), the hot fluid (15) of the heating unit (13) is continuously circulated and injected into the modular heating filter plate group (8) (9) to heat the colloidal sludge (38) in the filter chamber to improve the colloidal sludge (38) The fluidity of the internal water body;

1. Sludge reverse pressure heating and dehydration process, when the filtrate discharge volume of the pressure dehydration process is reduced to a minimum, the action of the sludge pressure pump (7) is stopped, and the diaphragm reverse pressure pump (16) pumping storage heating unit is started The hot fluid (15) of (15) enters the modular heating membrane filter plate (9), so that the membrane expands and squeezes the colloidal sludge (38) in the filter chamber to further remove the water content, and is heated with this program module The filter plate group (8) (9) is still continuously injected with the hot fluid (15) to heat the colloidal sludge (38) in it;

One filter chamber negative pressure heating evaporation dehydration process, when the filtrate discharge in the reverse pressure dehydration process is reduced to the minimum, start the vacuum pump (21) to vacuumize the filter chamber to reduce the inner pressure of the filter chamber, so that the colloidal sludge (38) in the filter chamber is discharged. The evaporation temperature of the water is reduced, and the heating value of the heating fluid (15) is injected into the filter chamber by the modular heating filter plate group (8) (9), so that it evaporates into water vapor and is discharged to the heating filter press (37) to achieve dehydration. drying effect;

In a vapor condensation process, the vacuum pump (21) sucks the water vapor and flows through the condenser (18) to be cooled by the cooling liquid circulating in it, condensed into a condensate, and the condensate is separated into the gas-liquid separation tank (19) to complete the gas-liquid separation Procedure, the residual gas is sucked out by the vacuum pump (21) and discharged into the atmosphere or the waste gas treatment device, and the condensate settles into the bottom of the gas-liquid separation tank (19) to accumulate a certain liquid level and then is discharged into the condensate tank (20) for storage to the rated amount for removal. ;

A circulating cooling liquid heat dissipation process occurs synchronously with the vapor condensation process. The cooling water is pumped and stored by the cooling water circulation pump (28) and injected into the condenser (17) for the heat exchange process, and the water vapor in the circulating condenser (17) is condensed into liquid. , after the heat exchange of the condenser (18), the cooling water that absorbs heat and warms up then flows into the cooling tower (27) for forced heat dissipation into the atmosphere. , the above procedures are continuously operated in order to achieve the purpose of low temperature pressure filtration, dehydration and drying of sludge.

In the existing drying methods, the wet material containing water is directly heated to the boiling point under normal pressure to make it boil for rapid dehydration and drying. All heat sources can only be generated by human beings, and they are all produced by consuming fuel. Apart from depleting the earth's resources and causing the greenhouse effect of the atmosphere due to the massive emission of carbon dioxide, the recent climate anomalies are all from the Therefore, and its energy use efficiency is not high, it is not a long-term ideal energy supply method. But how do we think carefully about how these fuel systems are created? In fact, we know that the fuel is converted from the organic organisms on the earth, and the energy source of the organisms is the radiant energy of the sun. The radiant energy of the sun is absorbed and utilized by plants and stored in the body of the organism. Similarly, the radiation of the sun The energy also simultaneously heats the earth's surface, atmosphere, and ocean to store radiant energy in it. Therefore, instead of obtaining indirect chemical energy from burning fuel, it is better to directly obtain solar energy from the atmosphere or ocean. The heat energy is obtained from the steam evaporated in the room and the normal temperature atmosphere, and is converted into the heat energy required for drying wet materials.

Generally, the refrigerant compressor (34) is a refrigerating element that drives the circulating flow of the refrigerant. The refrigerant is a substance that can change phase due to the change of the peripheral heat, such as water, ammonia, and Freon. When the refrigerant compressor (34) is running, the refrigerant is Circulating flow, the refrigerant absorbs heat in the cold row (32) and releases heat energy in the hot row (33). If the refrigerant is Freon-11, its evaporation temperature is much lower than the atmospheric temperature, so the heat energy of the normal temperature atmosphere can be transferred through the cold row (32). The refrigerant is supplied to the refrigerant so that the refrigerant can absorb heat to produce a phase transition. The refrigerant driven by the operation of the refrigerant compressor (34) of every 1Kw at the cold row (32) can absorb heat of 4020kcal/hr, and it can be dissipated at the hot row (33). The heat energy is 4880kcal/hr, of which the heat energy absorbed by the cold exhaust (32) is the heat energy of the atmospheric environment and the heat energy dissipated by the heat exhaust (33) is the atmospheric heat energy absorbed by the refrigerant plus the refrigerant compressor (34) Therefore, the heat energy change of 8900kcal/hr can be generated per 1kw of refrigerant compressor (34) work, and the heat energy of every 1kw of electric energy is only 860kcal/hr if it is directly generated by resistance, so the present invention can utilize this phenomenon The refrigerant compressor (34) with low power consumption is used to drive the refrigerant to absorb the heat energy in the atmospheric environment to generate several times the heat energy to dry the material.

As shown in FIG. 2 , the present invention is used in an energy-saving low-temperature filter press drying method for a filter press, wherein a refrigerant compressor (34) is used to replace the heating unit (13) and the heat dissipation cooling tower (27). The cold row (32) of (34) is connected to the vacuum pump (21), so that the water vapor generated in the filter chamber and the refrigerant circulating in the cold row exchange heat, and the refrigerant absorbs the heat energy of the water vapor and changes the temperature into a gaseous state and flows to the heat row (33) After being compressed and heated by the refrigerant compressor (34), the hot fluid heating pump (36) pumps the fluid in the heat storage fluid tank (35) and flows through the heat exhaust (33) to absorb and then pressurize and heat up the vapor state refrigerant to dissipate heat. Condensed into liquid refrigerant and then flows to the cold row (32), so that the calorific value discharged from the heat row (33) is used to heat the hot fluid (15) to circulate and heat the material of the heating filter press (37), and the cold row (32) The calorific value of the refrigerant absorbing the steam discharged from the filter chamber is condensed into a liquid state and discharged from the filter press, so as to achieve the purpose of energy saving and carbon reduction and low temperature drying of sludge.

The evaporation temperature of the water in the filter chamber depends on the internal pressure of the filter chamber. The larger the value is, the higher the calorific value of heat transfer per unit time will be, which will increase the calorific value received by the water body in the filter chamber, which will effectively increase the amount of evaporated water per unit time and effectively shorten the time of each operation cycle. In the low-temperature filter-press drying method shown in Figure 1, the cooling medium of the cooling water of the condensed steam used in the cooling tower (27) is the atmosphere, and the final temperature of the cooling water after heat dissipation is still higher than the atmospheric temperature, which will cause condensation The amount of steam that can be condensed by the device (18) will be affected by the atmospheric environment, so that the required exhaust volume of the vacuum pump (21) will change accordingly. When the evaporation temperature of the indoor water body rises, the temperature difference between the hot fluid (15) heating the filter chamber and the evaporation temperature of the water body is reduced, so that the calorific value of the heat transfer per unit time decreases, and the calorific value received by the water body in the filter chamber decreases, resulting in a decrease in the calorific value per unit time. The amount of evaporated water is greatly reduced, and the time of each operation cycle is prolonged.

The high heat transfer efficiency low temperature filter press drying method shown in Fig. 3 uses the refrigerant of the refrigerant compressor (34) as steam. When the cooling water is condensed, the temperature of the steam can be reduced to above 0°C, and the temperature can be set so that the vacuum pump (21) ) The exhaust volume can be controlled and not affected by the atmospheric environment, so that the time of each operation cycle tends to be consistent. Since the refrigerant of the refrigerant compressor (34) is used when the steam condenses and the cooling water temperature is low, the pressure in the filter chamber can reach The minimum value of the vacuum pump (21) can reduce the evaporation temperature of the water body in the filter chamber to the minimum, and maximize the temperature difference between the heated hot fluid (15) and the evaporation temperature, increase the heat transfer efficiency and effectively shorten the evaporation and dehydration of the water body in the filter chamber. Due to the high price of the vacuum pump (21), in order to effectively reduce the cost of the equipment, it is possible to first condense the vapor in the condenser (18), the cooling tower (7) and other heat-dissipating devices using the atmosphere as the refrigerant, and then introduce the refrigerant. The compressor unit (34), because most of the energy has been absorbed by the condenser (18), the refrigerant compressor unit (34) needs to reduce the amount of condensed vapor, and the operating power of the associated equipment is greatly reduced, which is more economical.

As shown in Figure 3, the high heat transfer efficiency low temperature filter press drying method and device is provided with a refrigerant compressor (34) at the outlet end of the condenser (18) and is connected to the gas-liquid separation tank (19) by a pipeline. The refrigerant compressor (34) The cold row (32) of ) is then connected to the outlet of the condenser (18), and the residual vapor and condensate after being condensed by the condenser (18) are then subjected to the condensation procedure of the refrigerant in the cold row (32) to reduce the residual water vapor to After the minimum, the residual steam and condensed water are discharged to the gas-liquid separation tank (19) for the gas-liquid separation process. The heat absorbed by the cold exhaust (32) is dissipated by the heat exhaust (33) of the refrigerant compressor (34), and the fluid in the hot fluid tank (35) is drawn in and out by the hot fluid heating pump (36). The heat exhaust (33) transfers the calorific value absorbed by the refrigerant and the energy compressed by the refrigerant compressor (34) to the circulating fluid, and the heated fluid after the temperature rise is pumped by the heating pump (17) in the conditioning tank It is stored in the conditioning tank (6) for the heating process, and after the heat exchange process, the heat is transferred to the colloidal sludge (38) in the conditioning tank (6), and then the temperature drops and flows out of the conditioning tank (6) and then flows back to heat The fluid tank (35) carries out a heating procedure, and thus the purpose of further condensing and reducing steam and energy recovery and heating the materials in the tempering tank (6) is repeated.

(1): Sludge

(2): Sludge Thickener

(3): Thickened sludge

(4): Concentrator filtrate

(5): conditioned water

(6): Conditioning tank

(7): Sludge pressure pump

(8): Modular heating filter plate

(9): Modular heating membrane filter plate

(10): Heat upflow

(11): hot press fluid

(12): filter cloth

(13): Heating unit

(14): Heat flow circulating pump

(15): Thermal Fluid

(16): Diaphragm back pressure pump

(17): Tempering tank heating pump

(18): Condenser

(19): Gas-liquid separation tank

(20): Condensate tank

(21): Vacuum pump

(22): Vapor blocking valve

(23): Filtrate blocking valve

(24): Bottom valve of gas-liquid separation tank

(25): Condensate drain valve

(26): Cooling water tank

(27): cooling water cooling tower

(28): Cooling water circulation pump

(29): Filtrate tank

(30): Quenching and tempering pump

(31): conditioned water

(32): cold row

(33): heat exhaust

(34): Refrigerant compressor

(35): Thermal fluid tank

(36): Thermal fluid heating pump

(37): Heating filter press

(38): Colloidal sludge

(39): Filtrate

Fig. 1 is a schematic flow diagram of the low temperature filter press drying method and device for filter press according to the present invention.

FIG. 2 is a schematic flow chart of the energy-saving low-temperature filter-press drying method and device for filter press according to the present invention.

Fig. 3 is a schematic flow diagram of the low temperature filter press drying method and device with high heat transfer efficiency for filter press according to the present invention.

As shown in FIG. 1 , the low-temperature filter press drying method and device of the filter press of the present invention are used for drying and dehydrating the filter press sludge. The sludge thickening device (2) is activated, and the sludge (1) and the conditioning agent are injected simultaneously. The sludge thickener (2) removes most of the water in the sludge, the dewatered filtrate (4) is discharged to the filtrate tank (29), and the dewatered thickened sludge (3) is discharged into the conditioning tank (3) by gravity. 6), add the quantitative conditioning water (31) into the conditioning tank (6) and stir it into a flowable colloidal sludge (38) with a mechanical forced stirring force. During the mechanical stirring, the conditioning tank heating pump (17) guides it. The hot fluid (15) enters the conditioning tank (6) to heat the colloidal sludge (38) inside, and is injected into the heating filter press (37) by the sludge pressure pump (7) for dehydration process.

Before the colloidal sludge (38) is injected into the heating filter press (37), the filter chamber of the filter press is closed to accept the sludge for dewatering operation, and the filtered filtrate (39) flows to the filtrate blocking valve on the pipeline of the filtrate tank (29). (23) open, the vapor blocking valve (22) is closed, while the feed is pressurized and dehydrated, the heat flow circulating pump (14) pumps the hot fluid (15) into the heating filter press (37) to heat the filter chamber, and flows out The hot fluid from the temperature drop of the modular heating filter plate group flows into the heating unit (13) and is heated again to carry out the continuous material heating procedure; when the discharge volume of the filtrate (39) is reduced to a minimum, the operation of the sludge pressurizing pump (7) is stopped, The diaphragm back pressure pump (16) starts the hot fluid (15) in the pumping and storage heating unit (13) and injects it into the modular heating diaphragm filter plate (9) to carry out the back pressure dehydration of the diaphragm, so that the sludge in the filter chamber is dehydrated. The moisture content of the film is further reduced, and the vacuum drying process is started as soon as the moisture content of the diaphragm is reduced to a minimum.

At this time, the vacuum pump (21) draws air to the filter chamber to reduce the internal pressure, and simultaneously heats the filter chamber so that the water content in the filter chamber evaporates into water vapor and is discharged from the heating filter press (37), and the water vapor passes through the condenser. The condensation of (18) becomes condensed liquid, and the gas-liquid mixture is separated from the gas-liquid in the gas-liquid separation tank (19). ) of the condensate to accumulate a certain amount, open the condensate bottom valve (24) and discharge it into the condensate tank (20), when the set liquid level is reached, open the condensate discharge valve (24) and discharge it into the filtrate tank (29), The vapor blocking valve (22) on the discharge pipeline of the filtrate (4) of the vacuum pump (21) is opened, and the filtrate blocking valve (23) is closed.

During the vacuum low temperature drying process, the cooling water is pumped and stored by the cooling water circulating pump (28) and injected into the condenser (18) to absorb the heat of the water vapor and then flow into the cooling tower (27) to discharge the absorbed heat to the atmosphere. After the temperature drop, the cooling water flows back to the cooling water tank (26), and is then pumped and stored by the cooling water circulation pump (28) and injected into the condenser (18) to repeat the operation procedure of steam condensation. Those who form a whole closed processing cycle.

In summary, the present invention has the following features:

(1) The material is suitable for a wide range, improving the dehydration of materials with poor fluidity and colloids that are not easy to dehydrate: the modular heating filter plate injects hot fluid (15) to heat the material in the filter chamber to reduce the viscosity and facilitate the dehydration operation. , and vacuum the filter chamber and then heat and evaporate the material to achieve the effect of further drying and dehydration.

(2) The heat source can use waste heat or refrigerant compressor to achieve the purpose of energy saving: the filter chamber is evacuated so that the evaporation temperature of the material is lower than the evaporation temperature of water under normal pressure conditions, so the excess waste heat in the general factory can be recovered and used to reduce energy consumption. In addition, the use of refrigerant compressors for heat generation and refrigeration has high energy efficiency, which can achieve the purpose of energy saving and carbon reduction.

散，且以低溫加熱乾燥生物類污泥不易死亡而分解腐敗產生臭氣。 (3) The airtight state heat conduction method is low-temperature drying, and the evaporated gas can be treated in a centralized manner to avoid odor.

The biological sludge is not easy to die and decompose and corrupt to produce odor by heating and drying at low temperature.

The above-mentioned method and device for low-temperature filter press drying in a filter press, by injecting hot fluid into the filter plate to heat the material in the filter chamber to improve the fluidity and improve the dehydration efficiency, and vacuum the filter chamber to perform a low-temperature drying and dehydration process, so that the The moisture content of the cake that is not easy to filter can be further reduced to achieve the function of combined dehydration and drying in a single machine.

The concept innovation of the present invention can overcome the lack of conventional devices, and can dehydrate and dry the materials that are not easy to filter in the filter press at the same time. If an application is filed in accordance with the law, I hope that the examination committee can benefit from the examination and grant the patent of this case as soon as possible. Pray for.

(1): Sludge

(2): Sludge Thickener

(3): Thickened sludge

(4): Concentrator filtrate

(5): conditioned water

(6): Conditioning tank

(7): Sludge pressure pump

(8): Modular heating filter plate

(9): Modular heating membrane filter plate

(10): Heat upflow

(11): hot press fluid

(12): filter cloth

(13): Heating unit

(14): Heat flow circulating pump

(15): Thermal Fluid

(16): Diaphragm back pressure pump

(17): Tempering tank heating pump

(18): Condenser

(19): Gas-liquid separation tank

(20): Condensate tank

(21): Vacuum pump

(22): Vapor blocking valve

(23): Filtrate blocking valve

(24): Bottom valve of gas-liquid separation tank

(25): Condensate drain valve

(26): Cooling water tank

(27): cooling water cooling tower

(28): Cooling water circulation pump

(29): Filtrate tank

(30): Quenching and tempering pump

(31): conditioned water

Claims (6)

A device for low temperature filter press drying used in a filter press, used in a filter press dehydrator, to heat the material to be filtered in the filter chamber of the filter press, so that the temperature of the material is reduced to reduce viscosity and facilitate filtration. The device includes: : A sludge thickening device (1), in which the sludge (2) is mixed with a conditioning agent to form a coagulated sludge that can be easily dehydrated, and most of the free water in the sludge is removed by the mechanical force of the sludge thickening device (1). Dewatered into high-concentration colloidal, immobile thickened sludge (3); A conditioning tank (6) is a tank with a built-in mixer and a heating coil, the concentrated sludge (3) is discharged into the conditioning tank (6), and conditioning water (31) is added and stirred by the mixer to form a pressurized sludge pump (7) The colloidal sludge (38) can be pumped and stored, the conditioning tank (6) and the heating filter press (7) are connected by a sludge pressure pump (7) and a pipeline, and the conditioning tank (6) It is connected with the heating unit (13) by a conditioning tank heating pump (7) and a pipeline to introduce a hot fluid (15) to heat the colloidal sludge (38) and then pressurize it into a heating filter press (37) for dehydration operator; A heating filter press (37), with a built-in modular heating filter plate (8) and a modular heating membrane filter plate (9), the two are arranged in a cross manner, the heating unit (13) and the modular heating filter plate (9) The plate groups (8) and (9) are connected by pipelines, and a heat flow circulating pump (14) is arranged on the pipeline to guide the hot fluid (15) to heat the colloidal sludge (3) in the filter press, and the heating unit (13) The modular heating membrane filter plate (9) is connected by a pipeline. The pipeline is equipped with a membrane reverse pressure pump (14) to guide the hot fluid (15) to reverse the colloidal sludge (38) in the filter press. Pressure dewatering operation, the two (8) (9) are connected to the filtrate tank (29) and the condenser (18), and the colloidal sludge (38) in the filter chamber is dehydrated and dried to minimize the moisture content; A heating unit (13) is a storage tank with built-in heating element and hot fluid (15), the heat source can be electric energy, steam, etc., to heat the hot fluid (15) in the tank and then lead it into the heating filter press (37) ) and the tempering tank (6) for heating operations; A vacuum generating unit, which includes a vacuum pump (21), a gas-liquid separation tank (19), and a condensate tank (20). The vacuum pump (21) and the heating filter press (37) are connected by a filtrate discharge line. A condenser (18) is arranged on the pipeline, a gas-liquid separation tank (19) is arranged between the condenser (18) and the vacuum pump (21), and a condensate tank (20) is arranged between the gas-liquid separation tank (19) and the filtrate tank (20). ), to pump and store the filter chamber of the filter press into a negative pressure state, so that the materials in the filter press can be evaporated at a low temperature by means of negative pressure, and separated by gas and liquid. From the tank (19) and the condensate tank (19), the condenser (18) condenses the vapor produced by the filter chamber into liquid condensed water to be excluded; A steam condensing unit, including a condenser (18), a cooling water tank (26) and a cooling tower (27), a cooling water circulating pump (28) is arranged between the condenser (18) and the cooling water tank (26) to guide the cooling water Entering the condenser (18), the vapor flowing through it is cooled and condensed into liquid. The condenser (18) is connected with the cooling tower (27) by a pipeline, and the heated cooling water is introduced into the cooling tower (27) for heat dissipation. The heat absorbed by the condenser (18) will be discharged, and the cooling water will flow into the cooling water tank (26) after the temperature drops, and then be pressurized by the cooling water circulation pump (28) and injected into the condenser (18) to circulate the steam generated by the filter chamber. Condensation operator. According to the method for low-temperature filter press drying of a filter press as described in item 1 of the patent application scope, the refrigerant compressor (34) is used to replace the heating unit (13) and the heat dissipation cooling tower (27), and the refrigerant is compressed. The cold row (32) of the machine (34) is connected to the vacuum pump (21) to produce cooling effect on the water vapor generated by the filter chamber, and the heat row (32) of the refrigerant compressor (34) is connected to the hot fluid tank (35) to cool the water vapor generated in the filter chamber. The hot fluid (15) is heated and heated, and the energy absorbed by the heat exhaust (32) is used as the source of heating the heating filter press (37) and the conditioning tank (6) to achieve the effect of energy saving. According to the method for low-temperature filter press drying for filter presses as described in the first item of the patent application scope, a refrigerant compressor unit (34) can be arranged at the outlet end of the condenser (18), and a pipeline is connected to a gas-liquid separation tank ( 19) Connection, connect the outlet of the condenser (18) with the cold row (32) of the refrigerant compressor unit (34), and the residual vapor and condensate after being condensed by the condenser (18) pass through the refrigerant in the cold row (32). The re-condensation process minimizes the residual water vapor, and the heat exhaust (33) of the refrigerant compressor (34) is connected with the hot fluid tank (35) by a pipeline, and a hot fluid heating pump (36) is arranged on the pipeline to heat the fluid. The fluid in the tank circulates into and out of the heat row (33) of the refrigerant compressor (34) to exchange the calorific value absorbed by the cold row (32). The hot fluid tank (35) and the conditioning tank (6) are connected by a pipeline. A conditioning tank heating pump (17) is installed on the pipeline to inject the heated fluid in the tank into the conditioning tank (6) to implement the heating process, and after the temperature drops, it flows back to the heated fluid tank (35) to form a closed loop. A method for drying by low-temperature filter press used in a filter press, the method comprising: A sludge conditioning and thickening process, in which the sludge (1) is mixed with a coagulation agent in the sludge thickening device (2) to form a conditioning sludge that is easy to dewater, and the conditioning sludge is removed by the physical and mechanical force of the sludge thickening device (2). Most of the free water inside becomes a thickened sludge that cannot flow (3); A sludge conditioning preheating process, the concentrated sludge (3) is discharged into the conditioning tank (6), mixed with a quantitative conditioning water (31), and then forced to flow by mechanical force to a rated moisture content The colloidal sludge (38) is simultaneously heated by the hot fluid (15) of the heating unit (13) to heat the colloidal sludge (38), and then injected into the heated pressure filter by the sludge pressure pump (7). The machine (37) carries out the sludge dewatering operation; 1. Sludge pressure heating and dehydration process, the colloidal sludge (38) is injected into the heating filter press (37) under mechanical pressure for dehydration. 29), the hot fluid (15) of the heating unit (13) is continuously circulated and injected into the modular heating filter plate group (8) (9) to heat the colloidal sludge (38) in the filter chamber to improve the colloidal sludge (38) The fluidity of the internal water body; 1. Sludge reverse pressure heating and dehydration process, when the filtrate discharge volume of the pressure dehydration process is reduced to a minimum, the action of the sludge pressure pump (7) is stopped, and the diaphragm reverse pressure pump (16) pumping storage heating unit is started The hot fluid (15) of (15) enters the modular heating membrane filter plate (9), so that the membrane expands and squeezes the colloidal sludge (38) in the filter chamber to further remove the water content, and at the same time the modular heating The filter plate group (8) (9) is still continuously injected with the hot fluid (15) to heat the colloidal sludge (38) in it; One filter chamber negative pressure heating evaporation dehydration process, when the filtrate discharge in the reverse pressure dehydration process is reduced to the minimum, start the vacuum pump (21) to vacuumize the filter chamber to reduce the inner pressure of the filter chamber, so that the colloidal sludge (38) in the filter chamber is discharged. The evaporation temperature of the water is reduced, and the heating value of the heating fluid (15) is injected into the filter chamber by the modular heating filter plate group (8) (9), so that it evaporates into water vapor and is discharged to the heating filter press (37) to achieve dehydration. drying effect; In a vapor condensation process, the vacuum pump (21) sucks the water vapor and flows through the condenser (18) to be cooled by the cooling liquid circulating in it, condensed into a condensate, and the condensate is separated into the gas-liquid separation tank (19) to complete the gas-liquid separation Procedure, the residual gas is sucked out by the vacuum pump (21) and discharged into the atmosphere or reprocessed by the waste gas treatment device, and the condensate settles into the bottom of the gas-liquid separation tank (19) to accumulate a certain liquid level before being discharged into the condensate tank (20) for storage until Rated quantity exclusion; A circulating cooling liquid heat dissipation process occurs synchronously with the vapor condensation process. The cooling water is pumped and stored by the cooling water circulation pump (28) and injected into the condenser (17) for the heat exchange process, and the water vapor in the circulating condenser (17) is condensed into liquid. , after the heat exchange of the condenser (18), the cooling water that absorbs heat and warms up then flows into the cooling tower (27) for forced heat dissipation into the atmosphere. , the above procedures are continuously operated in order to achieve the purpose of low temperature filter press drying and dehydration of sludge. As described in item 3 of the patent application scope, the device used for low-temperature filter press drying in a filter press, wherein the heating unit (13) contained therein can be changed to a refrigerant compressor unit (34) to generate heat and cool, and the refrigerant The cold discharge (32) of the compressor unit (34) is placed between the vacuum generating unit and the heating filter press (37), and the condensed refrigerant in the cold discharge (32) is used to cool down the steam flowing through the cold discharge and condense it into water. The hot exhaust (33) of the compressor unit (34) discharges the heat absorbed by the cold exhaust (32) to heat the hot fluid (15) in the hot fluid tank (36), so as to heat the filter press (37) and adjust the temperature. The sludge (1) in the mass tank (6) is heated, because the refrigeration and heat generation capacity of the refrigerant compressor unit (37) is several times that of the simple electric heating element, so the effect of energy saving can be obtained. The device used in the low-temperature filter press drying of the filter press as described in item 3 of the patent application scope, wherein the residual vapor after the condensation process of the condenser (18) is re-introduced into the cold row (32) of the refrigerant compressor (34). The residual water vapor is condensed to the minimum by its internal refrigerant and then introduced into the gas-liquid separation tank (19), and the heat absorbed by the cold exhaust (32) is discharged to the hot fluid by the heat exhaust (33) of the refrigerant compressor unit (34). The hot fluid (15) in the tank (36) is heated, and then the heated fluid heats the sludge (1) in the conditioning tank (6), so that the suction volume of the vacuum pump (21) is reduced to a minimum and reaches the filter chamber. The pressure is reduced synchronously, which has the purpose of maximum heat transfer efficiency and energy recovery and energy saving.

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