CN213375881U - Flue gas purification and waste heat recovery system based on calcium chloride solution - Google Patents
Flue gas purification and waste heat recovery system based on calcium chloride solution Download PDFInfo
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- CN213375881U CN213375881U CN202021876938.7U CN202021876938U CN213375881U CN 213375881 U CN213375881 U CN 213375881U CN 202021876938 U CN202021876938 U CN 202021876938U CN 213375881 U CN213375881 U CN 213375881U
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Abstract
The utility model relates to a technical field of energy-concerving and environment-protective equipment especially relates to a flue gas purification and waste heat recovery system based on calcium chloride solution, include: the device comprises a flue gas washing tower A, a circulating pump B, a concentrator C, a heat exchanger D, a mixer E and a heat exchanger F, wherein the purposes of absorbing moisture in saturated flue gas by a calcium chloride solution, recovering flue gas waste heat, purifying flue gas and eliminating white smoke are achieved by utilizing a steam heat energy cascade utilization principle and an evaporation concentration technology and utilizing the moisture absorption characteristic of the calcium chloride solution.
Description
Technical Field
The utility model relates to a technical field of energy-concerving and environment-protective equipment especially relates to a flue gas purification and waste heat recovery system based on calcium chloride solution.
Background
The temperature of flue gas of a boiler of a coal-fired power plant subjected to wet desulphurization is reduced to 45-60 ℃ in China, the flue gas at a desulphurization outlet is saturated humidity, the flue gas contains a large amount of water vapor, and the water vapor contains more soluble salts, SO3, gel dust, micro dust and the like (which are main components of haze). The part has a high contribution rate to haze, so that the requirements of eliminating white smoke in many areas in China are provided for reducing environmental pollution. At present, the smoke whitening technology in China mainly comprises several technical routes of direct smoke heating and emission, smoke cooling and emission and smoke cooling and reheating and emission, wherein the defects of high system operation energy consumption, system blockage and the like exist in the direct smoke heating and emission and the smoke cooling and reheating emission, and after the direct smoke cooling and emission, the emitted smoke is still the smoke with saturated humidity, so that the requirement of smoke whitening cannot be met at present.
The low-temperature flue gas has large enthalpy value, the heat energy can not be effectively recovered at present, the flue gas temperature is very low after passing through a desulfurization system, the heat exchange can not be effectively carried out, a large amount of heat energy of a power plant is consumed by adopting a low-temperature flue gas reheating technology, and the operation cost is high.
High concentration calcium chloride solution possesses very strong moisture absorption characteristic, can effectively absorb the moisture in the flue gas, calcium chloride solution after the absorption is through evaporative concentration back, multiplicable concentration, possess the moisture absorption characteristic again, extensively be used for the moisture absorption drying field, but behind the calcium chloride absorbed moisture, because the solution boiling point risees, evaporative concentration's energy consumption is higher, for reducing evaporation cost, domestic MVR evaporative concentration that has adopted, evaporative concentration is carried out to the calcium chloride solution, but because the heat transfer difference that MVR evaporative concentration device provided is low, only carry out the evaporation decrement in limited calcium chloride concentration range, lead to MVR equipment investment big, the operation energy consumption is high, do not possess economic nature.
And a multi-effect evaporation method is adopted, so that a large amount of steam is wasted, and the operation cost is more expensive. The method aims to realize clean emission of flue gas, purification of the flue gas, low-temperature flue gas waste heat recovery, effective combination of the moisture absorption characteristics of calcium chloride, realization of low-cost flue gas purification and waste heat recovery, energy conservation and consumption reduction, and the problem of power plant exploration.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
To prior art not enough, the utility model provides a flue gas purification and waste heat recovery system based on calcium chloride solution based on steam step utilization and waste heat recovery, automatically cleaning evaporative concentration technique.
(II) technical scheme
In order to achieve the above object, the utility model provides a following technical scheme: a flue gas purification and waste heat recovery system based on a calcium chloride solution is characterized by comprising a flue gas washing tower A, a circulating pump B, a concentrator C, a heat exchanger D, a mixer E and a heat exchanger F;
one port 1 of the flue gas scrubber A is provided with an inlet for flue gas behind a power plant desulfurizing tower, a second port 2 of the flue gas scrubber A is a low-temperature flue gas discharge port, a third port 3 of the flue gas scrubber A is a feed port for introducing a calcium chloride solution, and a fourth port 4 of the flue gas scrubber A is a discharge port for outputting the calcium chloride solution and is connected with an inlet 8 of a circulating pump B;
an outlet 10 of the circulating pump B is connected with an inlet 20 of the concentrator C, and an outlet 11 of the concentrator C is an outlet of the high-concentration calcium chloride solution after evaporation and concentration and is connected with an inlet 9 of the heat exchanger F;
a second inlet 6 of the heat exchanger F is used for entering low-temperature condensed water of the power plant or combustion-supporting air of the power plant, a first outlet 7 of the heat exchanger F is used for outputting the low-temperature condensed water after heat exchange or the combustion-supporting air of the power plant, the low-temperature condensed water after heat exchange or the combustion-supporting air of the power plant is preheated and returns to a boiler system of the power plant, and a second outlet 5 of the heat exchanger F is used for outputting a calcium chloride solution after heat exchange and;
a second inlet 12 of the concentrator C is a high-temperature steam inlet of the power plant, a second outlet 21 of the concentrator C is an evaporation secondary steam outlet and is connected with an inlet 15 of the heat exchanger D, and a third outlet 13 of the concentrator C is a steam condensate outlet and is connected with an inlet 14 of the mixer E;
and the low-temperature condensed water of the power plant is introduced into the second inlet 18 of the mixer E, is mixed with the steam condensed water in the mixer E, is guided out from the outlet 17 of the mixer E, is connected with the second inlet 16 of the heat exchanger D, and is discharged from the outlet 19 of the heat exchanger D after heat exchange and returns to the boiler system.
Preferably, the circulating pump overflowing piece is made of stainless steel 316L, 2205 dual-phase steel and titanium corrosion-resistant materials.
Preferably, the flue gas washing tower is a non-filler spray tower and comprises a tower body, a sprayer and a tower top demister.
Preferably, the concentrator is a single-effect self-cleaning forced circulation evaporation positive pressure concentrator.
Preferably, the heat exchangers all adopt tube type self-cleaning heat exchangers.
Preferably, the cooling medium entering the heat exchanger F is one or two of low-temperature condensed water of a power plant and combustion-supporting air of the power plant.
(III) advantageous effects
Compared with the prior art, the utility model provides a flue gas purification and waste heat recovery system based on calcium chloride solution possesses following beneficial effect:
1. the flue gas purification effect is ideal, the flue gas water vapor recovery efficiency is high, most of water mist is absorbed by calcium chloride solution, and water vapor discharged into the atmosphere is completely absorbed, so that the white feather phenomenon of the flue gas is eliminated, and harmful substances such as dust in the flue gas are further absorbed and purified, and the clean discharge of the flue gas is realized;
2. the solution after the calcium chloride absorbs moisture is directly heated and evaporated by high-temperature steam, and heat energy is recycled to the boiler after secondary steam generated by evaporation exchanges heat, so that the cascade utilization of steam heat energy is realized, the heat energy loss is reduced, and the operation cost of evaporation and concentration of the calcium chloride solution is greatly reduced;
3. after moisture in the flue gas is absorbed into a calcium chloride solution, partial heat energy of the flue gas is recovered to a boiler system through heat exchange, so that multiple benefits of waste heat recovery, flue gas whitening and flue gas purification are achieved;
4. the calcium chloride solution evaporation concentration and heat exchange equipment both adopt self-cleaning heat exchangers, and the heat exchange equipment is ensured not to be scaled and blocked, so that the current situations that the traditional heat exchange equipment is scaled, blocked and low in heat exchange efficiency and cannot stably run for a long time are solved, and the lower running cost is realized.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural diagram of the heater part of the heat exchanger F and the concentrator C of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, to achieve the above novel object, the following process is implemented:
after a calcium chloride solution with a certain concentration enters the flue gas washing tower A, a multilayer sprayer is designed in the tower, the sprayer sprays out solution liquid in a fine liquid drop shape, the solution liquid uniformly falls down in the tower and contacts with flue gas in a counter-current manner to absorb moisture and dust in the flue gas and exchange heat, the flue gas is dried and purified, a demister is arranged at the top of the flue gas washing tower, and liquid carried in the flue gas is further removed.
The concentration of the calcium chloride solution for absorbing water in the flue gas becomes dilute, the flow rate of the solution is controlled, the concentration of the calcium chloride solution is kept to be not lower than 40%, the solution is discharged to enter a concentrator for concentration, the concentrator keeps large-temperature-difference heat exchange, evaporation concentration of the calcium chloride solution is realized, secondary steam generated by evaporation concentration and heat exchanger wall-type heat exchange are carried out, the purpose of heat energy recovery is achieved through condensate water of a boiler of a preheating power plant, and steam condensate water generated by the concentrator is also recovered into the boiler.
The concentrated calcium chloride solution is further subjected to heat exchange through a heat exchanger, the condensed water or combustion-supporting air of a power plant is preheated, after heat energy is recovered, the temperature is reduced, and the heat energy is further recovered and then enters a flue gas washing tower for recycling.
In the embodiment, the heater parts of the heat exchanger F and the concentrator C adopt shell and tube self-cleaning heat exchangers, and the basic principle is that inert particles in shell and tube circulate in a closed circuit in the tube pass of the preheater, and through contact, impact, friction and the like with the tube wall, the scale is prevented from being generated on the tube wall, a three-phase flow fluidization operation body is formed, heat transfer is enhanced, the heat exchange efficiency is improved, and the scale formation is avoided.
The basic principle is as follows, with reference to fig. 2: the calcium chloride solution enters from an inlet, the particles and the salt solution in the tube pass of the heat exchanger flow upwards after being mixed at the bottom, so that the solid-state, gas-state and liquid-state three-phase flow states of the solution in the heating tube are realized, the disturbance, friction and impact effects of the particles are realized, the critical state of wall surface scaling is destroyed, and the purpose of preventing scaling is achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A flue gas purification and waste heat recovery system based on a calcium chloride solution is characterized by comprising a flue gas washing tower A, a circulating pump B, a concentrator C, a heat exchanger D, a mixer E and a heat exchanger F;
one port (1) of the flue gas scrubber A is provided with an inlet for flue gas behind a power plant desulfurizing tower, the second port (2) of the flue gas scrubber A is a low-temperature flue gas discharge port, the third port (3) of the flue gas scrubber A is a feed port for introducing a calcium chloride solution, and the fourth port (4) of the flue gas scrubber A is a discharge port for outputting the calcium chloride solution and is connected with an inlet (8) of a circulating pump B;
an outlet 10 of the circulating pump B is connected with an inlet (20) of the concentrator C, and an outlet (11) of the concentrator C is an outlet of the high-concentration calcium chloride solution after evaporation and concentration and is connected with an inlet (9) of the heat exchanger F;
a second inlet (6) of the heat exchanger F is used for entering low-temperature condensed water of the power plant or combustion-supporting air of the power plant, a first outlet (7) of the heat exchanger F is used for outputting the low-temperature condensed water after heat exchange or the combustion-supporting air of the power plant, the low-temperature condensed water or the combustion-supporting air is preheated and returned to a boiler system of the power plant, and a second outlet (5) of the heat exchanger F is used for outputting a calcium chloride solution after heat exchange and is connected with a third port (3) of;
a second inlet (12) of the concentrator C is a high-temperature steam inlet of the power plant, a second outlet (21) of the concentrator C is an evaporation secondary steam outlet and is connected with an inlet (15) of the heat exchanger D, and a third outlet (13) of the concentrator C is a steam condensate outlet and is connected with an inlet (14) of the mixer E;
and the low-temperature condensed water of the power plant is introduced into the two inlets (18) of the mixer E, is mixed with the steam condensed water in the mixer E, is guided out from the outlet (17) of the mixer E and is connected with the two inlets (16) of the heat exchanger D, and is discharged from the outlet (19) of the heat exchanger D after heat exchange and returns to the boiler system.
2. The system of claim 1, wherein the circulating pump flow-through member is made of stainless steel 316L, 2205 dual-phase steel and titanium corrosion-resistant materials.
3. The calcium chloride solution-based flue gas purification and waste heat recovery system according to claim 1, wherein the flue gas washing tower is a non-filler spray tower comprising a tower body, a sprayer and a tower top demister.
4. The system for purifying flue gas and recovering waste heat based on calcium chloride solution as claimed in claim 1, wherein the concentrator is a single-effect self-cleaning forced circulation evaporation positive pressure evaporator concentrator.
5. The system for purifying flue gas and recovering waste heat based on calcium chloride solution as claimed in claim 1, wherein the heat exchangers are all tube type self-cleaning heat exchangers.
6. The system for purifying flue gas and recovering waste heat based on calcium chloride solution as claimed in claim 1, wherein the cooling medium entering the heat exchanger F is one or two of low-temperature condensed water of power plant and combustion-supporting air of power plant.
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| CN202021876938.7U CN213375881U (en) | 2020-09-01 | 2020-09-01 | Flue gas purification and waste heat recovery system based on calcium chloride solution |
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| CN202021876938.7U CN213375881U (en) | 2020-09-01 | 2020-09-01 | Flue gas purification and waste heat recovery system based on calcium chloride solution |
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| CN213375881U true CN213375881U (en) | 2021-06-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113230851A (en) * | 2021-06-22 | 2021-08-10 | 中国矿业大学 | Boiler flue gas purification waste heat utilization system with concentration function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113230851A (en) * | 2021-06-22 | 2021-08-10 | 中国矿业大学 | Boiler flue gas purification waste heat utilization system with concentration function |
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Effective date of registration: 20230412 Address after: No. A2176, 2nd Floor, College Park, Zhongguancun Dongsheng Science and Technology Park, No.18 Xueqing Road, Haidian District, Beijing, 100088 Patentee after: Beijing shangruoshui Environmental Protection Technology Co.,Ltd. Address before: 4010, 4011, 2 Huatian Road, Huayuan Industrial Zone, Binhai New Area, Tianjin 300450 Patentee before: Qingdazhongneng (Tianjin) Environmental Protection Technology Co.,Ltd. |
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