Energy-saving and emission-reducing type acid waste gas treatment system

Abstract

The utility model provides an energy-saving and emission-reducing type acid waste gas treatment system which realizes energy-saving and emission-reducing type acid waste gas treatment by arranging a collecting pipeline, an alkaline washing tower, a low-temperature evaporation system, a fan, an exhaust funnel, a circulating pump, a drainage pump, a make-up pump and a dosing system. According to the system, loss of an absorbent, emission of aerosol-state pollutants and emission of wastewater are reduced through low-temperature distillation, the water reutilization rate of the system is increased, and water saving and emission reduction, heat energy recovery and efficient operation of acid waste gas are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to an energy-saving and emission-reducing acid waste gas treatment system. Background Art

[0002] Chemical neutralization technology is commonly used in the treatment of acidic waste gas. In the chemical scrubber, the acidic waste gas is fully contacted with the absorbent (such as alkaline solution) to undergo a neutralization reaction, converting the acidic substances into salts. The treated waste gas is discharged into the atmosphere through the exhaust pipe.

[0003] However, in the prior art, chemical neutralization technology will produce a large amount of acid-base wastewater, resulting in a waste of water resources and certain wastewater treatment costs. When the exhaust gas temperature is high, the exhaust gas and the absorbent are in contact and heat transfer, and the absorbent evaporates into the gas, further resulting in water loss. When the absorbent evaporates into the gas, it will carry the pollutants in the absorbent and the salts produced. These substances exist in the gas in the form of aerosols, which will cause the emission concentration and total amount at the exhaust pipe to exceed the standard, thereby polluting the surrounding environment. At the same time, the heat energy in the exhaust gas is not effectively utilized, resulting in energy waste. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide an energy-saving and emission-reduction type acid waste gas treatment system to solve the technical problems of how to save water and reduce emissions of acid waste gas, recover heat energy, and operate efficiently.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides an energy-saving and emission-reduction type acidic waste gas treatment system, which includes: a collecting pipe, an alkali washing tower, a low-temperature evaporation system, a fan, an exhaust pipe, a circulating pump, a drainage pump, a water replenishment pump and a dosing system; wherein a sensor device is installed at the bottom end of the alkali washing tower, and an alkali washing tower filler is provided in the middle of the alkali washing tower; the alkali washing tower, the fan and the exhaust pipe are connected in series; the alkali washing tower is connected to the circulating pump and the dosing system; the alkali washing tower is connected to the low-temperature evaporation system by respectively connecting the drainage pump and the water replenishment pump to generate condensed water for replenishing the alkali washing tower; the system will collect the acidic waste gas from the collecting pipe through the alkali washing tower and the fan in sequence, and discharge the purified waste gas through the exhaust pipe.

[0006] In one embodiment of the utility model, the sensing device includes: a liquid level sensor, a PH sensor and a conductivity sensor; wherein the PH sensor is connected to the dosing system; the conductivity sensor is connected to the drainage pump; and the liquid level sensor is connected to the water replenishment pump.

[0007] In one embodiment of the utility model, the low-temperature evaporation system includes: a low-temperature evaporator, a first storage tank, a second storage tank and a third storage tank; wherein the low-temperature evaporator is connected to the first storage tank, the second storage tank and the third storage tank respectively; the first storage tank is connected to the drainage pump, and the second storage tank is connected to the water replenishment pump; the absorbent of the alkali washing tower is transported to the first storage tank through the conductivity sensor and the drainage pump, and the absorbent of the alkali washing tower in the first storage tank is subjected to negative pressure low-temperature evaporation and condensation to generate condensed water through the low-temperature evaporator, and the condensed water is transported to the second storage tank, so that the condensed water in the second storage tank is transported to the alkali washing tower for water replenishment through the liquid level sensor and the water replenishment pump; the concentrated liquid is transported to the third storage tank by the low-temperature evaporator for regular outsourcing.

[0008] In one embodiment of the present invention, the low-temperature evaporation system further includes: a drain valve connected to the third storage tank and used to discharge the concentrated liquid in the third storage tank to the outside.

[0009] In one embodiment of the present invention, the system further comprises: a heat exchange system, which is arranged between the collecting pipe and the alkali washing tower and is used to recover the heat energy of the acid waste gas by heat exchange.

[0010] In one embodiment of the present invention, the heat exchange system includes: a heat exchanger and a cold chain pipe connecting the heat exchanger; wherein the types of heat exchangers include: a heat exchanger for water heat exchange and a heat exchanger for air heat exchange.

[0011] In one embodiment of the utility model, a high-efficiency demisting device is provided on the upper part of the alkali washing tower to intercept tiny droplets in the acidic waste gas.

[0012] In one embodiment of the utility model, the dosing system includes: a dosing pump and a dosing tank connected to the dosing pump; the alkaline agent in the dosing tank is transported to the absorbent of the alkali washing tower through the pH sensor and the dosing pump, and the absorbent is sprayed on the surface of the alkali washing tower filler through the circulating pump to form a liquid film for mass transfer process and neutralization reaction with the acidic components in the acidic waste gas to generate salt.

[0013] In one embodiment of the utility model, there are one or more alkali washing towers; and each alkali washing tower is provided with a corresponding sensor device, a circulation pump, a drainage pump, a water supply pump and a dosing pump.

[0014] In one embodiment of the present invention, when the condensed water in the second storage tank is insufficient, tap water is switched to replenish the alkali washing tower.

[0015] As described above, the utility model is an energy-saving and emission-reduction type acidic waste gas treatment system, which has the following beneficial effects: energy-saving and emission-reduction type acidic waste gas treatment is achieved by setting up a collection pipe, an alkali washing tower, a low-temperature evaporation system, a fan, an exhaust pipe, a circulation pump, a drainage pump, a water supply pump and a dosing system. The system uses low-temperature distillation to reduce the loss of absorbent, the emission of aerosol pollutants and wastewater discharge, improves the system water reuse rate, and achieves water-saving and emission reduction of acidic waste gas, heat recovery, and efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a structural schematic diagram of an energy-saving and emission-reducing acidic waste gas treatment system in one embodiment of the utility model.

[0017] Figure 2 Shown is a structural schematic diagram of an energy-saving and emission-reducing acidic waste gas treatment system in one embodiment of the utility model. DETAILED DESCRIPTION

[0018] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0019] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the utility model. It should be understood that other embodiments may also be used, and mechanical composition, structure, electrical and operational changes may be made without departing from the spirit and scope of the utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of the utility model is limited only by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit the utility model. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0020] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a part is said to "include" a certain constituent element, unless otherwise stated, it does not exclude other constituent elements, but means that other constituent elements may be included.

[0021] The terms first, second and third mentioned herein are used to describe various parts, components, regions, layers and / or segments, but are not limited thereto. These terms are only used to distinguish a certain part, component, region, layer or segment from other parts, components, regions, layers or segments. Therefore, the first part, component, region, layer or segment described below may refer to the second part, component, region, layer or segment within the scope of the present invention.

[0022] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0023] The utility model provides an energy-saving and emission-reduction type acid waste gas treatment system, which realizes energy-saving and emission-reduction type acid waste gas treatment by arranging a collection pipeline, an alkali washing tower, a low-temperature evaporation system, a fan, an exhaust pipe, a circulation pump, a drainage pump, a water replenishment pump and a dosing system. The system uses low-temperature distillation to reduce the loss of absorbent, the emission of aerosol pollutants and the discharge of wastewater, improves the water reuse rate of the system, and realizes water-saving and emission reduction of acid waste gas, heat energy recovery, and efficient operation.

[0024] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in a variety of different forms and is not limited to the embodiments described herein.

[0025] like Figure 1 A structural schematic diagram showing an energy-saving and emission-reducing acidic waste gas treatment system in an embodiment of the utility model is shown.

[0026] The energy-saving and emission-reducing acidic waste gas treatment system comprises:

[0027] Collection pipeline 1, alkali washing tower 2, low temperature evaporation system 3, fan 4, exhaust pipe 5, circulation pump 6, drainage pump 7, water supply pump 8 and dosing system 9;

[0028] Wherein, a sensor device is installed at the bottom of the alkali washing tower 2, and an alkali washing tower filler 10 is provided in the middle of the alkali washing tower 2;

[0029] The alkali washing tower 2 , the fan 4 and the exhaust pipe 5 are connected in series; the system passes the acid waste gas collected by the collection pipe 1 through the alkali washing tower 2 and the fan 4 in sequence, and discharges the purified waste gas through the exhaust pipe 5 .

[0030] The alkali washing tower 2 is connected to the circulation pump 6, and the alkali washing tower 2 is connected to the dosing system 9; the system transports the alkaline agent to the absorbent of the alkali washing tower through the dosing system 9, and sprays the absorbent on the surface of the alkali washing tower filler 10 through the circulation pump 6 to form a liquid film for mass transfer and neutralization reaction with the acidic components in the acidic waste gas to generate salt.

[0031] The alkali washing tower 2 is connected to the low-temperature evaporation system 3 by respectively connecting to the drainage pump 7 and the water replenishment pump 8; the system transports the absorbent of the alkali washing tower to the low-temperature evaporation system 3 through the drainage pump 7 for negative pressure low-temperature evaporation and condensation to produce condensed water, and transports the condensed water to the alkali washing tower 2 for water replenishment through the water replenishment pump 8.

[0032] In one embodiment, the sensing device includes: a liquid level sensor 11, a pH sensor 12 and a conductivity sensor 13; wherein the pH sensor 12 is connected to the dosing system 9; the conductivity sensor 13 is connected to the drainage pump 7; and the liquid level sensor 11 is connected to the water replenishment pump 8.

[0033] In one embodiment, the low-temperature evaporation system 3 includes: a low-temperature evaporator 31, a first storage tank 32, a second storage tank 33 and a third storage tank 34; wherein the low-temperature evaporator 31 is connected to the first storage tank 32, the second storage tank 33 and the third storage tank 34 respectively; the first storage tank 32 is connected to the drainage pump 7, and the second storage tank 33 is connected to the water replenishment pump 8;

[0034] The absorbent of the alkali washing tower is transported to the first storage tank 32 through the conductivity sensor 13 and the drainage pump 7, and the absorbent of the alkali washing tower in the first storage tank 32 is subjected to negative pressure low-temperature evaporation and condensation through the low-temperature evaporator 31 to produce condensed water, and the condensed water is transported to the second storage tank 33, and the condensed water in the second storage tank 33 is transported to the alkali washing tower 2 for water replenishment through the liquid level sensor 11 and the water replenishment pump 8; the concentrated liquid is transported to the third storage tank 34 by the low-temperature evaporator 31 and regularly outsourced for processing.

[0035] In a specific embodiment, the low-temperature evaporation system 3 further includes: a drain valve 35 connected to the third storage tank 34 and used to discharge the concentrated liquid in the third storage tank 34 to the outside, thereby achieving water saving and emission reduction.

[0036] In one embodiment, according to the control of the liquid level sensor 11 of the alkali washing tower 2, the water replenishment pump 8 automatically transports condensed water to the alkali washing tower 2 for replenishment. When the condensed water in the storage tank 33 is insufficient, it automatically switches to tap water replenishment.

[0037] In one embodiment, the system further includes: a heat exchange system, which is disposed between the collecting pipe 1 and the alkali washing tower 2 and is used to recover heat energy of the acidic waste gas by heat exchange.

[0038] In a specific embodiment, the heat exchange system includes: a heat exchanger 14 and a cooling pipe 15 connected to the heat exchanger 14; wherein the types of the heat exchanger 14 include: a heat exchanger 14 for water heat exchange and a heat exchanger 14 for air heat exchange.

[0039] The heat exchanger 14 can select water or air for heat exchange. The water after heat exchange can be used for air conditioning system or domestic water, and the hot air after heat exchange can be used for drying or as combustion air. Since the temperature of the acid waste gas after heat exchange is relatively low, the evaporation loss of the absorbent in the alkali washing tower and the emission of aerosol-state pollutants caused by waste gas heat transfer can be reduced, and the purpose of waste heat recovery can be achieved at the same time.

[0040] In one embodiment, a high-efficiency demisting device 16 is provided on the upper part of the alkali washing tower 2 to intercept tiny droplets in the acidic waste gas.

[0041] In one embodiment, the dosing system 9 includes: a dosing pump 91 and a dosing tank 92 connected to the dosing pump 91;

[0042] The alkaline agent in the dosing tank 92 is transported to the absorbent in the alkali washing tower 2 through the pH sensor 12 and the dosing pump 91, and the absorbent is sprayed on the surface of the alkali washing tower filler 10 through the circulation pump 6 to form a liquid film for mass transfer and neutralization reaction with the acidic components in the acidic waste gas to generate salt.

[0043] In one embodiment, there are one or more alkali washing towers 2; and each alkali washing tower 2 is provided with a corresponding sensor device, a circulation pump 6, a drainage pump 7, a water supply pump 8 and a dosing pump 91. In the case of multiple alkali washing towers 2, each alkali washing tower is connected in series in sequence. The drainage pump 7 and the water supply pump 8 of each alkali washing tower 2 are connected to the low-temperature evaporation system 3; and if the system is connected to a heat exchanger, the heat exchanger is connected between the collection pipe and the first alkali washing tower.

[0044] In order to better describe the energy-saving and emission-reduction type acid waste gas treatment system, it is now described in conjunction with the following specific embodiments.

[0045] Example 1: An energy-saving and emission-reducing acid waste gas treatment system. Figure 2 It is a schematic structural diagram of the energy-saving and emission-reduction type acid waste gas treatment system in this embodiment.

[0046] The energy-saving and emission-reduction type acid waste gas treatment system includes: a collection pipeline 1, a heat exchanger 14, a 1# alkali washing tower 21, a 2# alkali washing tower 22, a fan 4, an exhaust pipe 5, a circulation pump 61 / 62, a dosing pump 91, a drainage pump 7, a water supply pump 8, a dosing tank 92, a storage tank 32 / 33 / 34, a low-temperature evaporator 31, an alkali washing tower filler 10, a demister 16, a liquid level sensor 11, a PH sensor 12, a conductivity sensor 13, and a sewage valve 35; it should be noted that the 1# alkali washing tower 21 and the 2# alkali washing tower 22 are respectively provided with an alkali washing tower filler 10, a demister 16, a liquid level sensor 11, a PH sensor 12, and a conductivity sensor 13, and the 1# alkali washing tower 21 and the 2# alkali washing tower 22 are respectively provided with a circulation pump 61 / 62, a dosing pump 91, a drainage pump 7, and a water supply pump 8.

[0047] The acid waste gas passes through the heat exchanger 14 , the first alkali washing tower 21 , the second alkali washing tower 22 , and the fan 4 in sequence through the collection pipeline, and the purified waste gas is discharged through the exhaust pipe 5 .

[0048] A heat exchanger 14 is provided on the acid waste gas collecting main pipe 1 to recover the heat energy of the acid waste gas by heat exchange. Water or air can be selected for heat exchange. The water after heat exchange can be used for air conditioning system or domestic water, and the hot air after heat exchange can be used for drying or as combustion air. Since the temperature of the acid waste gas after heat exchange is relatively low, the evaporation loss of the absorbent in the alkali washing tower and the emission of aerosol-state pollutants caused by waste gas heat transfer can be reduced, and the purpose of waste heat recovery can be achieved at the same time.

[0049] According to the control of the PH sensor 12 of the 1# alkali washing tower 21 and the 2# alkali washing tower 22, the dosing pump 91 automatically transports the alkaline agent in the dosing tank 92 to the alkali washing tower absorbent, and the absorbent is sprayed on the surface of the alkali washing tower filler 10 through the circulation pump 61 / 62 to form a liquid film, and the alkaline absorbent liquid film undergoes a mass transfer process and a neutralization reaction with the acidic components in the exhaust gas to generate salt. Among them, the control method using the PH sensor 12 is a commonly used control method of sending a control signal based on sensor data, which can be implemented with the existing PH sensor 12, and no improvement is made here.

[0050] According to the control of the conductivity sensor 13 of the 1# alkali washing tower 21 and the 2# alkali washing tower 22, the drainage pump 7 automatically transports the absorbent to the storage tank 32, and the low-temperature evaporator 31 performs negative pressure low-temperature evaporation and condensation on the absorbent in the storage tank 32, and the condensed water is transported to the storage tank 33 for temporary storage as water replenishment for the alkali washing tower; the concentrated liquid of the low-temperature evaporator 31 is transported to the storage tank 34 for temporary storage, and is regularly outsourced through the sewage valve 35. According to the control of the liquid level sensor 11 of the 1# alkali washing tower 21 and the 2# alkali washing tower 22, the water replenishment pump 8 automatically transports the condensed water to the 1# alkali washing tower 21 and the 2# alkali washing tower 22 for water replenishment. When the condensed water in the storage tank 33 is insufficient, it automatically switches to tap water replenishment. Among them, the control method using the conductivity sensor 13 and the liquid level sensor 11 is a commonly used control method for sending control signals based on sensor data, which can be achieved with the existing conductivity sensor 13 and the liquid level sensor 11, and no improvement is made here.

[0051] The high-efficiency demisting device 16 at the top of the 1# alkali washing tower 21 and the 2# alkali washing tower 22 intercepts the tiny droplets in the exhaust gas.

[0052] This system uses low-temperature distillation and high-efficiency demisting technology to reduce absorbent loss, aerosol pollutant emissions and wastewater discharge, and improve the system's water reuse rate.

[0053] In summary, the energy-saving and emission-reduction type acid waste gas treatment system of the utility model realizes energy-saving and emission-reduction type acid waste gas treatment by setting a collection pipeline, an alkali washing tower, a low-temperature evaporation system, a fan, an exhaust pipe, a circulation pump, a drainage pump, a water supply pump and a dosing system. The system uses low-temperature distillation to reduce the loss of absorbent, the emission of aerosol pollutants and wastewater discharge, improves the system water reuse rate, and realizes water saving and emission reduction of acid waste gas, heat recovery, and efficient operation. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An energy-saving and emission-reducing acid waste gas treatment system, characterized in that: The system comprises: Collection pipeline, alkali washing tower, low-temperature evaporation system, fan, exhaust pipe, circulation pump, drainage pump, water supply pump and dosing system; Wherein, a sensor device is installed at the bottom of the alkali washing tower, and an alkali washing tower filler is arranged in the middle of the alkali washing tower; the alkali washing tower, the fan and the exhaust pipe are connected in series; the alkali washing tower is connected to the circulation pump and the dosing system; the alkali washing tower is connected to the low-temperature evaporation system by connecting the drainage pump and the water replenishment pump respectively, so as to generate condensed water for replenishing the alkali washing tower; The system will collect the acidic waste gas from the collection pipe through the alkali washing tower and the fan in sequence, and discharge the purified waste gas through the exhaust pipe.

2. The energy-saving and emission-reducing acid waste gas treatment system according to claim 1 is characterized in that: The sensing device includes: a liquid level sensor, a pH sensor and a conductivity sensor; Wherein, the pH sensor is connected to the dosing system; the conductivity sensor is connected to the drainage pump; The liquid level sensor is connected to the water replenishment pump.

3. The energy-saving and emission-reducing acid waste gas treatment system according to claim 2 is characterized in that: The low-temperature evaporation system comprises: a low-temperature evaporator, a first storage tank, a second storage tank and a third storage tank; Wherein, the low-temperature evaporator is connected to the first storage tank, the second storage tank and the third storage tank respectively; the first storage tank is connected to the drainage pump, and the second storage tank is connected to the water replenishment pump; The absorbent of the alkali washing tower is transported to the first storage tank through the conductivity sensor and the drainage pump, and the absorbent of the alkali washing tower in the first storage tank is subjected to negative pressure low-temperature evaporation and condensation through the low-temperature evaporator to produce condensed water, and the condensed water is transported to the second storage tank, and the condensed water in the second storage tank is transported to the alkali washing tower for water replenishment through the liquid level sensor and the water replenishment pump; the concentrated liquid is transported to the third storage tank by the low-temperature evaporator and outsourced regularly for treatment.

4. The energy-saving and emission-reducing acid waste gas treatment system according to claim 3 is characterized in that: The low-temperature evaporation system further comprises: a drain valve connected to the third storage tank and used for discharging the concentrated liquid in the third storage tank to the outside.

5. The energy-saving and emission-reducing acid waste gas treatment system according to claim 1 is characterized in that: The system further comprises: a heat exchange system, which is arranged between the collecting pipe and the alkali washing tower and is used for recovering the heat energy of the acid waste gas by heat exchange.

6. The energy-saving and emission-reducing acid waste gas treatment system according to claim 5 is characterized in that: The heat exchange system includes: a heat exchanger and a cold chain pipeline connecting the heat exchanger; wherein the types of heat exchangers include: a heat exchanger for water heat exchange and a heat exchanger for air heat exchange.

7. The energy-saving and emission-reducing acid waste gas treatment system according to claim 1 is characterized in that: A high-efficiency demisting device is provided on the upper part of the alkali washing tower to intercept tiny droplets in the acidic waste gas.

8. The energy-saving and emission-reducing acid waste gas treatment system according to claim 2 is characterized in that: The dosing system comprises: a dosing pump and a dosing tank connected to the dosing pump; The alkaline agent in the dosing tank is transported to the absorbent in the alkali washing tower through the pH sensor and the dosing pump, and the absorbent is sprayed on the surface of the alkali washing tower filler through the circulation pump to form a liquid film for mass transfer and neutralization reaction with the acidic components in the acidic waste gas to generate salt.

9. The energy-saving and emission-reducing acid waste gas treatment system according to claim 8, characterized in that: There are one or more alkali washing towers, and each alkali washing tower is provided with a corresponding sensor device, a circulation pump, a drainage pump, a water supply pump and a dosing pump.

10. The energy-saving and emission-reducing acid waste gas treatment system according to claim 3, characterized in that: When the condensed water in the second storage tank is insufficient, tap water is switched to replenish the alkali washing tower.

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