CN214198692U - Pharmaceutical process waste gas treatment system based on heat accumulating type incinerator - Google Patents
Pharmaceutical process waste gas treatment system based on heat accumulating type incinerator Download PDFInfo
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- CN214198692U CN214198692U CN202022765301.7U CN202022765301U CN214198692U CN 214198692 U CN214198692 U CN 214198692U CN 202022765301 U CN202022765301 U CN 202022765301U CN 214198692 U CN214198692 U CN 214198692U
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Abstract
The utility model relates to the technical field of waste gas treatment systems, in particular to a pharmaceutical process waste gas treatment system based on a heat accumulating type incinerator, which comprises a first mixing box, a filter, a three-groove heat accumulating type incinerator, a second mixing box, a quench tower, a washing tower and an exhaust tower in sequence; the first mixing boxes are connected with an air inlet pipe and a first heat bypass pipe, and an LEL monitor is mounted on the air inlet pipe; the second mixing box is connected with a second heat bypass pipe, and the first heat bypass pipe and the second heat bypass pipe are both connected with the three-groove heat accumulating type incinerator through a total heat bypass pipe. The utility model provides a three-groove heat accumulation formula burns burning furnace among the prior art's security relatively poor, corrosion resistant, not prevent blockking up, energy-conserving effect is not good, the little scheduling problem of operation elasticity. According to the pharmaceutical process waste gas treatment system, the LEL monitor, the first heat bypass pipe, the second heat bypass pipe and the PLC are automatically controlled in an interlocking manner, so that the stability and the safety of system operation are improved.
Description
Technical Field
The utility model relates to a waste gas treatment system technical field especially relates to a pharmacy technology waste gas treatment system based on heat accumulation formula burns burning furnace.
Background
With the continuous development of national economy and the gradual improvement of the living standard of people, people pay more attention to the pursuit of natural environment and physical health. The pharmaceutical industry has been greatly developed in recent years as a basic industry serving mass medical care, and various new drugs and new processes are emerging continuously. Meanwhile, the waste gas pollution brought by the pharmaceutical industry is more and more serious, so the national treatment standard for the industrial waste gas is continuously improved. Therefore, the waste gas treatment technology needs to meet higher treatment requirements so as to meet the increasingly severe environment-friendly management and control requirements.
The exhaust gas discharged by the pharmaceutical process is rich and miscellaneous, some are inorganic exhaust gas, but a large amount is organic exhaust gas. Inorganic waste gas is mostly absorbed by water, alkali liquor and acid liquor according to the waste gas characteristics, the technology is mature, the applicability is strong, and the treatment effect is good. The pollution components of the organic waste gas are generally insoluble in water, so the effect is poor by using a common absorption method. At present, according to the physical and chemical properties of waste gas, the treatment technology in the industry mainly comprises the modes of condensation, absorption, adsorption, combustion, biodegradation, plasma decomposition and the like.
Condensation method: some components with high concentration, high value and easy condensation can be recovered through condensation, and the method has the advantages of recycling and saving cost.
An adsorption method: for some components, an adsorption method is adopted, the process is simple, and the investment cost is low.
And (3) biodegradation: the waste gas is purified through the biological decomposition of the degrading bacteria, and the treatment effect on some specific substances is good.
Plasma decomposition: the waste gas molecules are plasmatized through high-voltage discharge, and then the waste gas is purified through ion rearrangement, so that the equipment is relatively simple, and the treatment efficiency is about 60-70%.
The combustion method comprises the following steps: the combustion can thoroughly remove the waste gas to oxidize it into carbon dioxide and water. Direct incineration requires fuel assistance and the operating cost is high. The heat accumulating type incineration is characterized in that the heat accumulating ceramic is arranged in the heat accumulating groove, so that the heat accumulating ceramic can quickly absorb/release heat, most of the heat can be recycled through circulating air flow, and the operation cost is reduced.
The Regenerative Thermal Oxidizer purifies the waste gas at high temperature, the oxidation temperature is 800-. The basic structure of the regenerative incinerator comprises an upper oxidation chamber, a lower regenerative chamber and switching valves for an inlet and an outlet. The heat accumulating type incinerator is energy-saving and efficient, and has a wide application prospect.
Compared with organic waste gas in other industries, the waste gas in the pharmaceutical process is complex in components, and may contain hydrocarbons, alcohols, carboxylic acids, esters, ketones, halogenated hydrocarbons, a small amount of hydrogen chloride, sulfur-containing organic substances and the like, and most of the substances are toxic and harmful. Therefore, the pharmaceutical waste gas discharged from the process plant cannot meet the requirements of the emission standard after being subjected to primary washing. In addition, the pharmaceutical process is mostly operated intermittently, the components of the waste gas of each batch are different, and the amount of the discharged waste gas and the concentration of the waste gas are unstable.
Aiming at the complex characteristics of the waste gas, single condensation, absorption, adsorption, biodegradation and plasma decomposition can not ensure the purification efficiency and the stability of the treatment effect. Although the common three-groove heat accumulating type incinerator has good energy-saving and removing effects, the common three-groove heat accumulating type incinerator cannot adapt to the constantly fluctuating waste gas concentration. Especially under the condition of high concentration, the waste gas of the pharmaceutical process has higher requirements on treatment efficiency and safety.
In the prior art, the common three-groove heat accumulating type incinerator also has the problems of low removal efficiency, low discharge concentration, low stability and standard reaching, equipment blockage and damage caused by crystallization and safety caused by large leakage amount.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to provide a pharmacy technology exhaust treatment system based on regenerative thermal type burns burning furnace for solve among the prior art three groove regenerative thermal type burn burning furnace safe relatively poor, not corrosion resistant, do not prevent blockking up, energy-conserving effect is not good, the operation elasticity is not big scheduling problem. According to the pharmaceutical process waste gas treatment system, the LEL monitor, the first heat bypass pipe, the second heat bypass pipe and the PLC are automatically controlled in an interlocking manner, so that the stability and the safety of system operation are improved. The pharmaceutical process waste gas treatment system also has the advantages of corrosion resistance, blockage prevention, high operation flexibility, strong adaptability to different waste gas concentrations and good energy-saving effect.
In order to realize above-mentioned purpose and other relevant purposes, the utility model provides a pharmacy technology exhaust-gas treatment system based on heat accumulation formula burns burning furnace, pharmacy technology exhaust-gas treatment system includes:
the first mixing box is connected with an air inlet pipe and a first heat bypass pipe, and an LEL monitor is mounted on the air inlet pipe;
a filter connected to the first mixing tank through a first pipe;
the three-groove type heat accumulating type incinerator is connected with the filter through a second pipeline;
the second mixing box is connected with the three-groove heat accumulating type incinerator through a third pipeline, and the second mixing box is connected with a second heat bypass pipe;
a quench tower connected to the second mixing tank by a fourth pipe;
a wash column connected to the quench column by a fifth conduit;
a discharge tower connected with the scrub tower through a sixth pipeline;
the first heat bypass pipe and the second heat bypass pipe are connected with the three-groove type regenerative incinerator through a total heat bypass pipe.
The pharmaceutical process waste gas treatment system is provided with the LEL monitor and the second heat bypass pipe, the LEL monitor can monitor the concentration of the waste gas at the inlet at any time, and the concentration of the waste gas at the inlet influences the furnace temperature and the fuel supply of the three-groove heat accumulating type incinerator. At low exhaust gas concentrations, the heat released by the oxidation of the exhaust gas is insufficient to maintain the furnace heat balance of the three-tank regenerative incinerator, which requires additional fuel heating by the burner. When the concentration of the waste gas is further improved (% LEL is between 3 and 4%), the released heat can just maintain the required oxidation temperature in the furnace, and at the moment, the fuel is not needed to be supplemented for heating through a burner, and a second hot bypass pipe is not needed to be opened. When the concentration of the waste gas rises upwards, the second heat bypass pipe is required to be opened, and the PLC controls the opening degree of a valve on the second heat bypass pipe through the temperature of the oxidation chamber and the average temperature of the heat storage tank so as to adjust the air volume of the second heat bypass pipe to maintain the heat balance in the furnace. If the second hot by-pass pipe is not installed, the temperature in the furnace will continuously rise, and the furnace is stopped to be protected when the temperature exceeds the alarm value, which greatly limits the application range of RTO (three-groove regenerative thermal oxidizer), and further influences the treatment of workshop process waste gas. Therefore, the LEL monitor is arranged on the air inlet pipe, the concentration of combustible gas in the waste gas is detected in real time, when the concentration of the waste gas is detected to exceed a certain set value, the system firstly opens a valve of the second heat bypass pipe to bypass and exhaust redundant heat, and meanwhile, the burner is kept to be shut down or in a minimum output state; and once the concentration is detected to exceed the set upper limit value, the engine is immediately tripped for protection, the isolating valve on the air inlet pipe is closed, the valve of the waste gas bypass pipe is opened, and the waste gas is discharged from the waste gas bypass pipe.
The LEL measured value is high, the VOC concentration in the waste gas is high, and the high VOC concentration can cause the waste gas to have large heat release after entering the hearth of the three-groove heat accumulating type incinerator, so that the incinerator temperature is increased.
The pharmacy process waste gas treatment system is provided with a first heat bypass pipe, the first heat bypass pipe is connected with the three-groove heat accumulating type incinerator, and therefore the first heat bypass pipe enables part of high-temperature waste gas containing hydrogen chloride after being treated by the three-groove heat accumulating type incinerator to flow back to the front end (namely a first mixing box) of the three-groove heat accumulating type incinerator, and the high-temperature waste gas containing hydrogen chloride is fully mixed with the process waste gas in the first mixing box, so that the preheating effect is achieved. The temperature of the preheated mixed gas is increased, the temperature of the inlet gas is ensured to be higher than the dew point of hydrochloric acid, and the direct corrosion to equipment is avoided, so that the long-term safe operation of the system is ensured.
The design of first hot bypass pipe can also make ammonia fully react with hydrogen chloride in the waste gas and generate the ammonium chloride crystallization, leads to three-groove formula heat accumulation formula after the filter is handled again and burns burning furnace, avoids waste gas direct entering to burn burning furnace and produces the ammonium chloride crystallization, causes heat accumulation pottery to block up the scheduling problem. The design of the first heat bypass pipe also improves the overall temperature of the exhaust gas flow path, and effectively reduces the possibility of corrosion to equipment. And the design of material selection, base material corrosion prevention and condensed water drainage is combined, so that the long-term safe and stable operation of the system is ensured.
The three-groove heat accumulating type incinerator is adopted in the pharmacy process waste gas treatment system for waste gas combustion, so that most of heat released by waste gas can be recycled, the fuel consumption is obviously reduced, and the operation cost of an enterprise is reduced. When the three-groove heat accumulating type incinerator is in the starting stage and the concentration of waste gas is low, the fuel needs to be supplemented and heated by the combustor and the fuel adjustment string.
The purification efficiency of the waste gas of the pharmacy process waste gas treatment system reaches 99%, the heat energy released by the waste gas can be fully recovered, the production and operation cost is reduced, the energy-saving effect is remarkable, the purification efficiency is high, the applicable waste gas concentration fluctuation range is large, and the operation stability is good. The pharmacy process waste gas treatment system effectively solves the problem that equipment is blocked or damaged due to ammonium chloride crystallization in pharmacy waste gas.
According to the pharmaceutical process waste gas treatment system, the LEL monitor, the first heat bypass pipe, the second heat bypass pipe and the PLC are automatically controlled in an interlocking manner, so that the stability and the safety of system operation are improved.
Although most organic components are oxidized and decomposed after the waste gas is purified by the three-groove heat accumulating type incinerator, the waste gas in the pharmaceutical process generally contains chlorinated hydrocarbons, namely dichloromethane, hydrogen chloride gas can be formed after the dichloromethane is decomposed at high temperature, the hydrogen chloride gas can be dissolved in water to form hydrochloric acid, the hydrochloric acid has great acidity, and meanwhile, chloride ions are also very corrosive to carbon steel and general stainless steel. Therefore, the purified gas cooled by the quenching tower must be absorbed by a washing tower, and the absorbent is sodium hydroxide solution to absorb and neutralize the hydrogen chloride in the purified gas.
In an embodiment of the utility model, the intake pipe all communicates with waste gas bypass pipe and new trend conveyer pipe, waste gas bypass pipe and new trend conveyer pipe are installed the LEL monitor with between the first mixing box.
When the concentration of the exhaust gas detected by the LEL exceeds the alarm upper limit value, the second heat bypass pipe cannot maintain the heat balance in the furnace after the LEL is opened, the exhaust gas is continuously introduced into the RTO (three-groove heat accumulating type incinerator) to have great safety risk, the PLC can immediately start the trip protection, and the exhaust gas is emergently discharged from the exhaust gas bypass pipe. Therefore, the LEL monitor and the thermal bypass are arranged, the concentration range of the waste gas which can be used by the RTO is enlarged, the system is particularly suitable for the waste gas concentration change of the waste gas of the pharmaceutical process caused by intermittent operation, the operation flexibility of the system is improved, and meanwhile, the safety of the system operation is greatly improved.
In an embodiment of the present invention, the exhaust bypass pipe is connected to the scrubber.
In an embodiment of the present invention, the three-tank regenerative thermal oxidizer includes a first heat storage tank, a second heat storage tank, a third heat storage tank, and a combustion tank;
the second pipeline is connected with an air inlet branch pipe, and the air inlet branch pipe is connected with the first heat storage tank, the second heat storage tank and the third heat storage tank;
the third pipeline is connected with an air outlet branch pipe, and the air outlet branch pipe is connected with the first heat storage tank, the second heat storage tank and the third heat storage tank;
the first heat storage tank, the second heat storage tank and the third heat storage tank are all connected with a ventilation branch pipe, and the ventilation branch pipe is connected with a ventilation pipe.
Besides the normal internal heat preservation design, the three-groove heat accumulating type incinerator takes the corrosion of hydrogen chloride generated by oxidation on the equipment body into consideration, and all the corrosion prevention measures are taken on the whole equipment. The air receiving part of the three-groove heat accumulating type incinerator is made of dual-phase steel 2205, and the surface of the base material is coated with anticorrosive paint. The inner surfaces of the first heat storage tank, the second heat storage tank, the third heat storage tank and the combustion tank are all lined with vinyl anticorrosive resin, and the temperature resistance can reach 150 ℃. The cold junction material of three groove formula heat accumulation formula incinerator adopts N08367 material to the fluid-discharge tube is add to the bottom, and the cold junction does not have any raffinate when guaranteeing the system shut down. Therefore, the equipment is prevented from being corroded by acid liquor, the service life of the system is prolonged, and the long-term safe and stable operation of the system is ensured.
The three-groove heat accumulating type incinerator consists of three heat accumulating grooves and a combustion groove. High-temperature-resistant heat storage ceramics are filled in the first heat storage tank, the second heat storage tank and the third heat storage tank, so that energy carried by oxidized high-temperature flue gas can be stored, and the energy can be used for preheating process waste gas at the outlet of the air inlet branch pipe. In the operation process of the system, the waste gas of the previous cycle is discharged after passing through the first heat storage tank, the second heat storage tank and the third heat storage tank and is preheated for the first heat storage tank, the second heat storage tank and the third heat storage tank, so that the temperature of the waste gas of the next cycle is rapidly increased after entering the preheated first heat storage tank, the preheated second heat storage tank and the preheated third heat storage tank. The periodic reversal switching will distribute the heat evenly throughout the incinerator. The circulation is repeated, so that the heat released by the oxidation of the waste gas is fully utilized. The three-tank design also alleviates the intermittent discharge problem of switching between the waste gas inlet and the treated discharge outlet of the system tank bed.
In an embodiment of the present invention, the scavenging fan is installed on the scavenging pipe, and the relay fan is installed on the second pipeline.
In an embodiment of the present invention, the inlet valve is installed on the inlet branch pipe, the outlet valve is installed on the outlet branch pipe, and the purge valve is installed on the ventilation branch pipe. The inlet valve, the outlet valve and the purge valve are all switching valves, the switching valves are in unique vertical type action design, and the switching of the inlet valve, the outlet valve and the purge valve is automatically controlled through a PLC. At the moment of switching the diverter valve, introduce the new trend through sweeping the fan 14 with the waste gas that the entrance is detained and sweep, return to three slot type regenerative incinerator purification treatment again, can reduce the not high, unstable situation of waste gas purification efficiency that leads to because of the system switches remains waste gas like this.
The inlet valve, the outlet valve and the blowing valve are all switching valves, the switching valves are used in cooperation with the three-groove heat accumulating type incinerator and are mainly used for controlling state switching of a process waste gas inlet, blowing and an outlet, the inlet valve is used for controlling waste gas inlet, the outlet valve is used for controlling purified flue gas exhaust, and the blowing valve is used for controlling blowing wind. The switching valve beside the three-groove heat accumulating type incinerator can make the waste gas periodically and circularly flow in the three-groove heat accumulating type incinerator. The mode of switching the airflow direction is completed by PLC control, and the control of the PLC for periodical switching greatly optimizes the system efficiency.
In an embodiment of the present invention, the heat storage ceramic is installed in the first heat storage tank, the second heat storage tank, and the third heat storage tank, and the saddle ceramic is installed at the top and the bottom of the heat storage ceramic. Saddle ceramics are paved on the upper part and the lower part of the heat storage ceramics of the heat storage tank, the saddle ceramics on the lower part can improve the distribution surface of air flow, the effect of preventing the blockage of ceramic honeycomb holes is realized, and the cleaning by water is convenient during the maintenance.
In an embodiment of the present invention, the first heat bypass pipe and the second heat bypass pipe are connected to the combustion tank through a total heat bypass pipe.
In an embodiment of the present invention, the sixth pipeline is provided with a demister and an exhaust fan. The washing tower is filled with filler, and the washing liquid is conveyed to the top of the tower through a circulating pump and is sprayed to absorb hydrogen chloride. The sixth pipeline is provided with a demister to reduce the circulating liquid brought out along with the airflow, and the middle of the washing tower is provided with a redistributor to ensure that the absorption liquid is uniformly distributed and the absorption efficiency is improved. The purified gas can meet the requirements of emission standards through the absorption treatment of the washing tower.
As above, the utility model discloses a pharmacy technology exhaust treatment system based on regenerative thermal type burns burning furnace has following beneficial effect:
1. the pharmaceutical process waste gas treatment system is provided with the LEL monitor and the second heat bypass pipe, the LEL monitor can monitor the concentration of the waste gas at the inlet at any time, and the concentration of the waste gas at the inlet influences the furnace temperature and the fuel supply of the three-groove heat accumulating type incinerator.
2. The pharmacy process waste gas treatment system is provided with a first heat bypass pipe, the first heat bypass pipe is connected with the three-groove heat accumulating type incinerator, and therefore the first heat bypass pipe enables part of high-temperature waste gas containing hydrogen chloride after being treated by the three-groove heat accumulating type incinerator to flow back to the front end (namely a first mixing box) of the three-groove heat accumulating type incinerator, and the high-temperature waste gas containing hydrogen chloride is fully mixed with the process waste gas in the first mixing box, so that the preheating effect is achieved. The temperature of the preheated mixed gas is increased, the temperature of the inlet gas is ensured to be higher than the dew point of hydrochloric acid, and the direct corrosion to equipment is avoided, so that the long-term safe operation of the system is ensured.
3. The design of first hot bypass pipe can also make ammonia fully react with hydrogen chloride in the waste gas and generate the ammonium chloride crystallization, leads to three-groove formula heat accumulation formula after the filter is handled again and burns burning furnace, avoids waste gas direct entering to burn burning furnace and produces the ammonium chloride crystallization, causes heat accumulation pottery to block up the scheduling problem. The design of the first heat bypass pipe also improves the overall temperature of the exhaust gas flow path, and effectively reduces the possibility of corrosion to equipment. And the design of material selection, base material corrosion prevention and condensed water drainage is combined, so that the long-term safe and stable operation of the system is ensured.
4. The three-groove heat accumulating type incinerator is adopted in the pharmacy process waste gas treatment system for waste gas combustion, so that most of heat released by waste gas can be recycled, the fuel consumption is obviously reduced, and the operation cost of an enterprise is reduced. According to the pharmaceutical process waste gas treatment system, the LEL monitor, the first heat bypass pipe, the second heat bypass pipe and the PLC are automatically controlled in an interlocking manner, so that the stability and the safety of system operation are improved.
5. The purification efficiency of the waste gas of the pharmacy process waste gas treatment system reaches 99%, the heat energy released by the waste gas can be fully recovered, the production and operation cost is reduced, the energy-saving effect is remarkable, the purification efficiency is high, the applicable waste gas concentration fluctuation range is large, and the operation stability is good. The pharmacy process waste gas treatment system effectively solves the problem that equipment is blocked or damaged due to ammonium chloride crystallization in pharmacy waste gas.
Drawings
Fig. 1 is a schematic view of a waste gas treatment system of a regenerative thermal oxidizer-based pharmaceutical process according to an embodiment of the present invention.
Description of the element reference numerals
1-a first mixing tank; 2, an air inlet pipe; 3-a first hot bypass pipe; 4-LEL monitor; 5-an exhaust gas bypass pipe; 6-fresh air conveying pipe; 7-a filter; 8-a first conduit; 9-three-groove heat accumulating type incinerator, 901-first heat accumulating groove, 902-second heat accumulating groove, 903-third heat accumulating groove, 904-combustion groove; 10-total heat bypass pipe; 11-a second conduit; 12-a second mixing tank; 13-a third conduit; 14-a second hot bypass pipe; 15-a quench column; 16-a fourth conduit; 17-a washing column; 18-a fifth conduit; 19-a discharge column; 20-a sixth conduit; 21-a demister; 22-an exhaust fan; 23-an intake manifold; 24-an outlet manifold; 25-a ventilation branch pipe; 26-a ventilation tube; 27-a purge fan; 28-relay fan; 29-inlet valve; 30-an outlet valve; 31-a purge valve; 32-an isolation valve; 33-a burner; 34-combustion-supporting fan.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Referring to fig. 1, the utility model provides a pharmacy technology exhaust-gas treatment system based on regenerative thermal type burns burning furnace, pharmacy technology exhaust-gas treatment system includes:
the system comprises a first mixing box 1, a second mixing box 1 and a third mixing box, wherein the first mixing box 1 is connected with an air inlet pipe 2 and a first heat bypass pipe 3, and an LEL monitor 4 is installed on the air inlet pipe 2; the air inlet pipe 2 is communicated with an exhaust gas bypass pipe 5 and a fresh air delivery pipe 6, and the exhaust gas bypass pipe 5 and the fresh air delivery pipe 6 are arranged between the LEL monitor 4 and the first mixing box 1; the waste gas bypass pipe 5 is connected with a washing tower 17;
a filter 7, said filter 7 being connected to said first mixing tank 1 by a first conduit 8;
a three-channel regenerative thermal oxidizer 9, the three-channel regenerative thermal oxidizer 9 being connected to the filter 7 through a second pipe 11; the three-groove regenerative thermal oxidizer 9 comprises a first heat storage groove 901, a second heat storage groove 902, a third heat storage groove 903 and a combustion groove 904; heat storage ceramics are arranged in the first heat storage tank 901, the second heat storage tank 902 and the third heat storage tank 903, and saddle ceramics are arranged at the top and the bottom of the heat storage ceramics; one end of the total heat bypass pipe 10 is directly led out from a combustion groove 904 of the three-groove regenerative thermal oxidizer 9 and is divided into a first heat bypass pipe 3 and a second heat bypass pipe 14; the PLC controls the air quantity of the first heat bypass pipe 3 through a valve on the first heat bypass pipe 3, and controls the air quantity of the second heat bypass pipe 14 through a valve on the second heat bypass pipe 14;
a second mixing box 12, the second mixing box 12 being connected to the three-tank regenerative thermal oxidizer 9 through a third pipe 13; the second mixing tank 12 is connected with a second hot bypass pipe 14;
a quench tower 15, said quench tower 15 being connected to said second mixing tank 12 by a fourth pipe 16;
a scrubber 17, said scrubber 17 being connected to said quench tower 15 by a fifth pipe 18;
a discharge tower 19, said discharge tower 19 being connected to said scrubber tower 17 by a sixth conduit 20; a demister 21 and an exhaust fan 22 are arranged on the sixth pipeline 20;
the second pipeline 11 is connected with an air inlet branch pipe 23, and the air inlet branch pipe 23 is connected with the first heat storage tank 901, the second heat storage tank 902 and the third heat storage tank 903; the third pipeline 13 is connected with an air outlet branch pipe 24, and the air outlet branch pipe 24 is connected with the first heat storage tank 901, the second heat storage tank 902 and the third heat storage tank 903; the first heat storage tank 901, the second heat storage tank 902 and the third heat storage tank 903 are all connected with a ventilation branch pipe 25, and the ventilation branch pipe 25 is connected with a ventilation pipe 26; a purging fan 27 is installed on the air exchange pipe 26, and a relay fan 28 is installed on the second pipeline 11; an inlet valve 29 is installed on the air inlet branch pipe 23, an outlet valve 30 is installed on the air outlet branch pipe 24, and a purging valve 31 is installed on the air exchange branch pipe 25.
The working process is as follows:
1. the waste gas from the process workshop firstly passes through an alkali liquor washing tower beside the workshop, most of acidic substances and part of organic waste gas components which are easily dissolved in water are removed through primary pretreatment, and then the waste gas is sent to a waste gas purification system through an air inlet pipe 2.
2. The pre-treated exhaust gas is split into two paths before the isolating valve 32 of the inlet pipe 2. During normal operation, the isolating valve 32 of the air inlet pipe 2 is opened, the waste gas enters the first mixing box 1 through the isolating valve 32, is uniformly mixed with hot gas brought by the first hot bypass pipe 3 in the first mixing box 1, is filtered by the filter 7, and pumps the waste gas in the filter 7 to the three-groove heat accumulating type incinerator 9 under the action of the relay fan 28, and the relay fan 28 provides a main power source for the whole system to overcome the resistance of the system. In emergency stop, the isolating valve 32 of the inlet pipe 2 is closed, the valve of the exhaust gas bypass pipe 5 is opened, and the exhaust gas directly reaches the washing tower 17 through the exhaust gas bypass pipe 5 under the action of the exhaust fan 22.
3. The exhaust gas enters the three-channel regenerative incinerator 9 through the second pipe 11 and the inlet branch pipe 23 to be combusted, and the combusted exhaust gas enters the second mixing box 12 through the outlet branch pipe 24 and the third pipe 13 and is mixed with the high-temperature purified gas in the second heat bypass pipe 14 in the second mixing box 12.
4. The temperature of the mixed gas in the second mixing box 12 is still as high as 200-300 ℃, and then the mixed gas is introduced into a quenching tower 15 for cooling. The top of the quench tower 15 is provided with a cooling water spray head, and the ultra-fine particle water mist sprayed by the spray head is rapidly vaporized after contacting with the mixed gas (namely the high-temperature purified gas). Because the latent heat of vaporization of water is very large, the water vaporization needs to absorb a large amount of heat, so that the temperature of the high-temperature purified gas can be quickly reduced by using a small amount of water, and the temperature of the high-temperature purified gas is reduced by the quenching tower 15 so as to facilitate the subsequent washing treatment.
5. The purified gas cooled by the quenching tower 15 is absorbed by a washing tower 17, and the absorbent is sodium hydroxide solution to absorb and neutralize the hydrogen chloride in the purified gas.
6. After exiting the scrubber 17, the purified air is pumped by the exhaust fan 22, through the sixth pipe 20, to the exhaust tower 19 (i.e., chimney) and then exhausted aloft.
The waste gas concentration control process comprises the following steps:
1. at low exhaust gas concentrations, the heat released by the oxidation of the exhaust gas is insufficient to maintain the furnace heat balance of the three-tank regenerative incinerator 9, which requires additional fuel heating by the burner 33. The fuel used by the three-groove regenerative incinerator 9 is diesel oil, the diesel oil is atomized by atomized air, liquefied petroleum gas is used as ignition fuel, and air required by oxidation is provided by a combustion fan 34.
2. When the exhaust gas concentration is further increased (% LEL is between 3% and 4%), the released heat can just maintain the required oxidation temperature in the furnace, and at this time, the fuel is not needed to be supplemented for heating through the burner 33, and the second hot bypass pipe 14 is not needed to be opened.
3. When the concentration of the exhaust gas rises upwards again, the second hot by-pass pipe 14 is opened, and the PLC controls the opening degree of a valve on the second hot by-pass pipe 14 through the temperature of the oxidation chamber and the average temperature of the heat storage tank so as to adjust the air quantity of the second hot by-pass pipe 14 to maintain the heat balance in the furnace.
4. When the concentration of the exhaust gas detected by the LEL exceeds the alarm upper limit value, the second heat bypass pipe 14 cannot maintain the heat balance in the furnace after being opened, the exhaust gas is continuously introduced into the RTO (three-groove heat accumulating type incinerator 9) to have great safety risk, the PLC immediately starts the trip protection, and the exhaust gas is emergently discharged from the exhaust gas bypass pipe 5.
To sum up, the utility model discloses the automatic interlocking control of LEL monitor 4, first hot bypass pipe 3, the hot bypass pipe 14 of second and PLC of above-mentioned pharmaceutical technology exhaust-gas treatment system setting has improved the stability and the security of system operation. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. The utility model provides a pharmacy technology exhaust-gas treatment system based on heat accumulation formula burns burning furnace which characterized in that, pharmacy technology exhaust-gas treatment system includes:
the system comprises a first mixing box (1), wherein the first mixing box (1) is connected with an air inlet pipe (2) and a first heat bypass pipe (3), and an LEL (LeL) monitor (4) is installed on the air inlet pipe (2);
a filter (7), the filter (7) being connected to the first mixing tank (1) by a first conduit (8);
a three-channel regenerative thermal oxidizer (9), the three-channel regenerative thermal oxidizer (9) being connected to the filter (7) through a second pipe (11);
a second mixing box (12), wherein the second mixing box (12) is connected with the three-groove regenerative incinerator (9) through a third pipeline (13), and the second mixing box (12) is connected with a second hot by-pass pipe (14);
a quench tower (15), said quench tower (15) being connected to said second mixing tank (12) by a fourth pipe (16);
a scrubber (17), said scrubber (17) being connected to said quench column (15) by a fifth pipe (18);
a discharge column (19), said discharge column (19) being connected to said scrubber column (17) by a sixth conduit (20);
the first heat bypass pipe (3) and the second heat bypass pipe (14) are connected with the three-groove type regenerative incinerator (9) through a total heat bypass pipe (10).
2. The system of claim 1, wherein the system comprises: intake pipe (2) all communicate with exhaust-gas bypass pipe (5) and new trend conveyer pipe (6), install exhaust-gas bypass pipe (5) and new trend conveyer pipe (6) LEL monitor (4) with between first mixing box (1).
3. The system of claim 2, wherein the system comprises: the waste gas bypass pipe (5) is connected with the washing tower (17).
4. The system of claim 1, wherein the system comprises: the three-groove type regenerative thermal incinerator (9) comprises a first heat storage groove (901), a second heat storage groove (902), a third heat storage groove (903) and a combustion groove (904);
the second pipeline (11) is connected with an air inlet branch pipe (23), and the air inlet branch pipe (23) is connected with the first heat storage tank (901), the second heat storage tank (902) and the third heat storage tank (903);
the third pipeline (13) is connected with an air outlet branch pipe (24), and the air outlet branch pipe (24) is connected with the first heat storage tank (901), the second heat storage tank (902) and the third heat storage tank (903);
the first heat storage tank (901), the second heat storage tank (902) and the third heat storage tank (903) are all connected with a ventilation branch pipe (25), and the ventilation branch pipe (25) is connected with a ventilation pipe (26).
5. The system of claim 4, wherein the system comprises: and a purging fan (27) is arranged on the air exchange pipe (26), and a relay fan (28) is arranged on the second pipeline (11).
6. The system for treating the waste gas of the pharmaceutical process based on the regenerative thermal oxidizer as set forth in claim 4 or 5, wherein: an inlet valve (29) is installed on the air inlet branch pipe (23), an outlet valve (30) is installed on the air outlet branch pipe (24), and a purging valve (31) is installed on the air exchange branch pipe (25).
7. The system for treating the waste gas of the pharmaceutical process based on the regenerative thermal oxidizer as set forth in claim 4 or 5, wherein: heat storage ceramics are arranged in the first heat storage tank (901), the second heat storage tank (902) and the third heat storage tank (903), and saddle ceramics are arranged at the top and the bottom of the heat storage ceramics.
8. The system of claim 4, wherein the system comprises: the first heat bypass pipe (3) and the second heat bypass pipe (14) are both connected with the combustion groove (904) through a total heat bypass pipe (10).
9. The system of claim 1, wherein the system comprises: and a demister (21) and an exhaust fan (22) are arranged on the sixth pipeline (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022765301.7U CN214198692U (en) | 2020-11-25 | 2020-11-25 | Pharmaceutical process waste gas treatment system based on heat accumulating type incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022765301.7U CN214198692U (en) | 2020-11-25 | 2020-11-25 | Pharmaceutical process waste gas treatment system based on heat accumulating type incinerator |
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| Publication Number | Publication Date |
|---|---|
| CN214198692U true CN214198692U (en) | 2021-09-14 |
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|---|---|---|---|
| CN202022765301.7U Active CN214198692U (en) | 2020-11-25 | 2020-11-25 | Pharmaceutical process waste gas treatment system based on heat accumulating type incinerator |
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| Country | Link |
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| CN (1) | CN214198692U (en) |
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