CN217855467U - Overlapping formula heat-carrying flue gas energy-saving purifies energy-conserving system that disappears - Google Patents

Abstract

The utility model relates to a boiler flue gas treatment field, especially a cascade type heat-carrying flue gas energy-saving purification energy-saving system that disappears. Including the condensation spray column of reheating, the energy-saving appliance, be equipped with the heat exchange tube from top to bottom in the condensation spray column of reheating in proper order, spray layer II, the water receiving tray, spray layer I and hot water cistern, the hot water cistern is located the bottom of condensation spray column of reheating, the top of condensation spray column of reheating is equipped with the exhanst gas outlet, the top lower part of condensation spray column of reheating is equipped with the flue gas inlet, the exhanst gas outlet is located the lateral wall of the condensation spray column of reheating above the heat exchange tube, the flue gas inlet is located the lateral wall of the condensation spray column of reheating between layer I and the hot water cistern of spraying. The double-condensation flue gas and the single-heating flue gas are utilized to realize the overlapping effect of purifying and eliminating the white smoke, the low-quality waste heat of the boiler smoke is fully utilized, the cold source and the heat source are automatically and mutually supplied in the system, meanwhile, part of the waste heat of the flue gas is recycled, the cold source and the heat source do not need to be additionally provided, and the investment cost is greatly reduced.

Description

Overlapping formula heat-carrying flue gas energy-saving purifies energy-conserving system that disappears

Technical Field

The utility model relates to a boiler flue gas treatment field, especially a cascade type heat-carrying flue gas energy-saving purification energy-saving system that disappears.

Background

Coal in the boiler can generate a large amount of water vapor during combustion, latent heat of the water vapor is often directly discharged into the atmosphere along with flue gas, waste of flue gas waste heat is caused, and the flue gas waste heat accounts for about 10% of the calorific value of the coal. In addition, the flue gas generated by boiler combustion is treated by wet desulphurization to form saturated wet flue gas, the flue gas carries a large amount of pollutants such as particulate matters, sulfur oxides, nitrogen oxides, heavy metals and the like, and if the flue gas is directly discharged into the atmosphere, serious pollution is caused to the atmosphere; meanwhile, in the wet flue gas emission process, when the atmospheric temperature is lower than the flue gas temperature, water vapor is condensed into liquid drops, the condensation accelerates the accumulation of pollutants, and dust haze is formed under the photochemical action. The liquid drops with different sizes are refracted and radiated in the atmosphere, and a white or grey-white smoke phenomenon appears. At present, the white smoke is eliminated by adopting a cooling method and a reheating method.

The method for eliminating the white smoke by using the cooling method is to reduce the temperature of the smoke through a cold source and condense and suck water vapor in the smoke to eliminate the white smoke. Two sources of heat sinks are commonly used. One is to use artificial cold source such as heat pump, etc., and its advantages are stable operation, adjustable system, high reliability, high energy consumption and high investment and operation cost. The other is to use natural cold source such as cold air, etc., its advantages are low energy consumption, low investment and running cost, and its disadvantages are strong system running season, unstable running caused by unstable cold source, and low reliability.

The existing reheating method for eliminating white smoke means that cold smoke is heated to a state far away from saturation through a heat source, so that white smoke is difficult to generate during precooling of the smoke, as shown in fig. 1. The method has the advantage that the temperature of the heating source is adjustable. However, the following disadvantages also exist: (1) The cost for heating the flue gas is high, and an additional heat source is needed to heat the flue gas, so that the heat efficiency of the boiler is reduced; (2) The smoke temperature is high, the temperature of a required heat source is higher, and the requirement of eliminating white smoke can be met only by high-quality heat.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the above-mentioned defect that prior art exists, a cascade type heat-carrying flue gas energy-saving purification energy-saving system that disappears is proposed, it utilizes dual condensation flue gas and a reheat flue gas to realize disappearing the overlapping effect that the white is disappeared to flue gas purification, the low-quality used heat of make full use of boiler exhaust fume, when having realized the automation of cold source and heat source and supplying each other in the system, partial flue gas waste heat has been retrieved, need not additionally to provide cold source and heat source, investment cost reduces greatly, moreover, the steam generator is simple in structure, and convenient operation.

The technical scheme of the utility model is that: a cascade heat-carrying flue gas energy-saving, purifying, whitening and energy-saving system comprises a condensation reheating spray tower and an energy saver, wherein a heat exchange tube, a spray layer II, a water receiving tray, a spray layer I and a hot water reservoir are sequentially arranged in the condensation reheating spray tower from top to bottom;

the hot water reservoir is connected with an inlet of the heat exchange tube, and an outlet of the heat exchange tube is connected with the spraying layer I;

be equipped with the boiler on the economizer and heated cold water import, the boiler is heated hot water export, cold water export and hot water import, the solution export of economizer with spray layer II and be connected, be sealing connection between the inside wall of water receiving tray and the reheat spray column of condensation, and the lateral wall of water receiving tray is equipped with the stock solution ring with the junction of the reheat spray column of condensation, the solution import and the stock solution ring of economizer are connected, and the interval sets up several flue gas passageway on the water receiving tray.

The utility model discloses in, the lateral wall of hot water cistern is equipped with hydrothermal solution export, and hydrothermal solution export is equipped with the hot-water pump on the connecting pipeline of hydrothermal solution export and heat exchange tube through the import intercommunication of connecting tube and heat exchange tube.

And a cold water pump is arranged on a connecting pipeline between a cold liquid outlet of the energy saver and the spraying layer II.

In I inflow heat exchanger pipes of high temperature alkaline solution in the hot water cistern, at the in-process that flows in the heat exchanger pipe, for saturated cold cigarette II provides the heat source, carry out the reheat to saturated cold cigarette II and consume white, high temperature alkaline solution I is cooled off and is low temperature alkaline solution I back, provide the cold source for saturated hot cigarette, through spraying layer I, the low temperature alkaline solution I that will atomize cools down to saturated hot cigarette and disappears white, be heated for high temperature alkaline solution I after low temperature alkaline solution I absorbs the heat of saturated hot cigarette, flow into in the hot water cistern, realize the circulation of high temperature alkaline solution I in this system.

After II flows into the energy-saving appliance of high temperature alkaline solution, waste heat utilization through the energy-saving appliance, II cooling of high temperature alkaline solution are low temperature alkaline solution II, provide the cold source for saturated cold cigarette I, through spraying layer II, the low temperature alkaline solution II after will atomizing cools down to saturated cold cigarette I and disappears white, low temperature alkaline solution II is heated after absorbing the heat of saturated cold cigarette I and is high temperature alkaline solution II, and flow into the energy-saving appliance once more through the water receiving tray, the circulation of high temperature alkaline solution II in this system has been realized.

The beneficial effects of the utility model are that:

(1) The system adopts the combination of a double-cooling method for eliminating white smoke and a double-reheating method for eliminating white smoke to realize the white smoke elimination of the boiler flue gas, and meanwhile, the flue gas is washed by double spraying and condensing the flue gas through alkaline solution fog drops with alkaline PH, so that the flue gas dedusting and acidic gas emission reduction purification effects are realized;

(2) The cold source and the heat source are supplied by self and mutually, so that the cold source and the heat source are sequentially circulated in the system, the cold source and the heat source do not need to be additionally provided, the investment cost and the operation energy consumption cost for producing the cold source and the heat source in the prior art are saved, and the investment and the operation cost are low;

(3) The smoke condensation reheating method is fully utilized to eliminate white smoke, and the circulation of the high-temperature alkaline solution I in the system is realized; meanwhile, the energy saver recycles part of the waste heat of the flue gas, and white smoke is eliminated by a flue gas condensation method, so that the circulation of a high-temperature alkaline solution II in the system is realized;

(4) The utilization of low-quality waste heat of boiler exhaust smoke is realized: the white smoke is eliminated by a double-temperature reduction method and the white smoke is eliminated by a double-reheating method, and meanwhile, the low-quality waste heat of the boiler exhaust smoke is recycled, so that extra income is generated;

to sum up, the system implements double condensation flue gas and reheating flue gas, realizes the overlapping effect of the white smoke elimination, combines various components which reach the same effect in the prior art into one system, and has the advantages of greatly reduced investment, simple structure and convenient operation.

Drawings

FIG. 1 is a schematic diagram of the operation of eliminating white smoke by reheating;

fig. 2 is a schematic structural diagram of the present invention.

In the figure: 1, condensing and reheating a spray tower; 2, a smoke outlet; 3, a hot water pump; 4 a hot liquid outlet; 5, a hot water reservoir; 6, a flue gas inlet; 7, spraying a layer I; 8, receiving a water tray; 9 liquid storage ring; 10 a flue gas channel; 11 spraying layer II; 12 a cold water pump; 13 an energy saver; 14 heat exchanging pipes.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of other ways than those herein described and those skilled in the art will be able to make similar generalizations without departing from the scope of the invention. The invention is therefore not to be limited by the specific embodiments disclosed below.

As shown in fig. 1, the overlapping heat-carrying flue gas energy-saving, purifying, whitening and energy-saving system of the present invention comprises a condensation reheating spray tower 1 and an economizer 13. The condensation reheating spray tower 1 is internally provided with a heat exchange tube 14, a spray layer II 11, a water receiving tray 8, a spray layer I7 and a hot water reservoir 5 from top to bottom in sequence, and the hot water reservoir 5 is positioned at the bottom of the condensation reheating spray tower 1. The top of condensation reheat spray tower 1 is equipped with exhanst gas outlet 2, and the lower part of condensation reheat spray tower 1 is equipped with flue gas inlet 6, and wherein flue gas outlet 2 is located the lateral wall of the condensation reheat spray tower of heat exchange tube 14 top, and flue gas inlet 6 is located the lateral wall of the condensation reheat spray tower between spray layer I7 and hot water cistern 5. The flue gas flows from bottom to top in the condensation reheating spray tower 1.

The side wall of the hot water reservoir 5 is provided with a hydrothermal outlet 4, the hydrothermal outlet 4 is communicated with the inlet of the heat exchange tube 14 through a connecting pipeline, the connecting pipeline between the hydrothermal outlet 4 and the heat exchange tube 14 is provided with a hot water pump 3, and the hot water reservoir 5 is pumped with a high-temperature alkaline solution I into the heat exchange tube 14 through the hot water pump 3. In the process that the high-temperature alkaline solution I flows in the heat exchange tube 14 from top to bottom, the flue gas flowing from bottom to top absorbs the heat of the high-temperature alkaline solution in the heat exchange tube 14, and the high-temperature alkaline solution I is cooled to be the low-temperature alkaline solution I and flows out through the outlet of the heat exchange tube 14.

The export of heat exchange tube 14 is connected with spraying layer I7 through connecting line, directly gets into from the low temperature alkaline solution I that flows out in heat exchange tube 14 and sprays layer I7, sprays layer I7 and atomizes low temperature alkaline solution, and low temperature alkaline solution I after the atomizing moves from last to bottom under the effect of gravity. Saturated hot cigarette that boiler wet flue gas desulfurization produced gets into in condensation reheat spray column 1 through flue gas inlet 6 and from supreme flow down, and the vaporific low temperature alkaline solution I that flows down from the follow absorbs the heat of supreme flowing saturated hot cigarette down this moment, and low temperature alkaline solution I intensifies and becomes high temperature alkaline solution I, finally falls into hot water reservoir 5 in, has realized the hot water circulation in the hot water reservoir 5. At the same time, the saturated hot smoke temperature decreases to become saturated cold smoke i. The atomized low-temperature alkaline solution I reduces the temperature of saturated hot smoke, washes the smoke, absorbs acidic substances in the smoke and purifies the smoke.

The economizer 13 is provided with a boiler heated cold water inlet, a boiler heated hot water outlet, a solution outlet and a solution inlet, wherein the boiler heated cold water flows into the economizer 13 from the boiler heated cold water inlet, and flows out through the filtered heated hot water outlet after the heat exchange and temperature rise in the economizer 13. The solution outlet of the energy saver 13 is connected with the spraying layer II 11 through a connecting pipeline, and a cold water pump 12 is arranged on the connecting pipeline between the solution outlet of the energy saver and the spraying layer II 11. Be sealing connection between the inside wall of water receiving tray 8 and condensation reheat spray tower 1, and the lateral wall of water receiving tray 8 is equipped with liquid storage ring 9 with the junction of condensation reheat spray tower 1 to make the hot water on the water receiving tray 8 all flow into in the liquid storage ring 9. The solution inlet of the energy saver 13 is connected with the liquid storage ring 9 through a connecting pipeline. A plurality of smoke channels 10 are arranged on the water receiving tray 8 at intervals, and saturated cold smoke I absorbed by cold water mist sprayed from the spraying layer I7 flows to the upper portion of the water receiving tray 8 from bottom to top through the smoke channels 10.

In the economizer 13, the hot alkaline solution ii flowing into the economizer 13 heats the boiler heated cold water, and the boiler heated cold water absorbs the heat of the hot alkaline solution ii and then the temperature of the boiler heated cold water rises to be boiler heated hot water, and the boiler heated hot water flows out through a boiler heated hot water outlet. The high-temperature alkaline solution II absorbs heat, the temperature of the high-temperature alkaline solution II is reduced to be low-temperature alkaline solution II, and the low-temperature alkaline solution II is sucked into the spraying layer II 11 under the suction action of the cold water pump 12. Spray layer I7 and atomize low temperature alkaline solution II, low temperature alkaline solution II after the atomizing moves from top to bottom under the effect of gravity, saturation cold cigarette I flows to spraying layer II 11 direction from lower to upper simultaneously, the flow in-process of saturation cold cigarette I, the water smoke of low temperature alkaline solution II absorbs the heat of saturation cold cigarette I, the water smoke temperature of low temperature alkaline solution II rises and falls to and form high temperature alkaline solution II on water receiving tray 8, and flow into in the liquid storage ring 9, thereby realized the circulation flow of high temperature alkaline solution II in energy-saving appliance 13. After the saturated cold smoke I absorbs heat, the temperature is reduced to saturated cold smoke II again. The water mist of the low-temperature alkaline solution II cools the saturated cold smoke I, and simultaneously washes the smoke, so that the effects of smoke dust removal and emission reduction of acidic gas purification are achieved. And in the process that the saturated cold smoke II continuously flows upwards, the saturated cold smoke II flows through the heat exchange tube 14, absorbs the heat of the high-temperature alkaline solution I in the heat exchange tube 14, finally forms unsaturated hot smoke, and flows out from the smoke outlet 2 at the top of the condensation reheating spray tower 1.

The alkaline solution in the application can be prepared by adding factory process water into 32% sodium hydroxide solution, and only needs to realize that the pH of the solution is more than 7.

The working process of purifying and whitening the smoke by using the system is as follows. Saturated hot cigarette flows into condensation reheat spray column 1 back through gas inlet 6, and at its in-process that flows from bottom to top, at first with spray layer I7 and spray the water smoke of the low temperature alkaline solution I that produces and meet, the water smoke of low temperature alkaline solution I absorbs the heat of saturated hot cigarette, washes saturated hot cigarette. The water mist of the low-temperature alkaline solution I absorbs heat and is heated up and then directly falls into the hot water reservoir 5, and the saturated hot smoke is cooled to become saturated cold smoke I, so that the first heavy cooling method is realized to eliminate white smoke. Saturated cold cigarette I passes through the flue gas passageway 10 of water receiving tray 8 and continues upward flowing in-process, meets with the water smoke that sprays II 11 on layer II and spray the low temperature alkaline solution II that produces again, and the water smoke of low temperature alkaline solution II absorbs I thermal while of saturated cold cigarette, washes saturated cold cigarette I. The water mist of the low-temperature alkaline solution II absorbs heat and is heated up and then falls on the water receiving tray 8 to become the high-temperature alkaline solution II, and the saturated cold smoke I is cooled again to become the saturated cold smoke II, so that the second cooling method is realized to eliminate the white smoke. In the process that the saturated cold smoke II continuously flows upwards, the saturated cold smoke II absorbs the heat of hot water in the heat exchange tube 14 while flowing through the heat exchange tube 14, and the saturated cold smoke II absorbs the heat to become unsaturated hot smoke, so that the effect of eliminating white smoke by a double reheating method is achieved.

In the purification and white elimination process of flue gas, high-temperature alkaline solution I in the hot water reservoir 5 flows into the heat exchange tube 14, in the flowing process in the heat exchange tube 14, a heat source is provided for saturated cold smoke II in a cooled area, the hot water heating cold smoke, namely white smoke, is eliminated by implementing a reheating method, a cold source is provided after the high-temperature alkaline solution I is cooled to be low-temperature alkaline solution I, the white smoke, namely cold water cooling hot smoke, is eliminated by implementing a first heavy cooling method, the low-temperature alkaline solution I absorbs the heat of the saturated hot smoke, is heated to be high-temperature alkaline solution I and flows into the hot water reservoir 5 again, and the circulation of the high-temperature alkaline solution I in the system is realized.

Meanwhile, after the high-temperature alkaline solution II flows into the energy saver 13, the high-temperature alkaline solution II is cooled to be the low-temperature alkaline solution II through waste heat utilization of the energy saver 13, a cold source is provided for the saturated cold smoke I, white smoke, namely cold water cooling hot smoke, is eliminated by implementing a second cooling method, the low-temperature alkaline solution II absorbs heat of the saturated cold smoke I, is heated to be the high-temperature alkaline solution II, and flows into the energy saver 13 again, and circulation of the high-temperature alkaline solution II in the system is achieved.

The cascade heat-carrying flue gas energy-saving, purifying, white-eliminating and energy-saving system provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. The utility model provides a cascade type heat-carrying flue gas energy-saving purification energy-saving and energy-saving system that disappears, including condensation reheat spray tower (1), its characterized in that, still include economizer (13), be equipped with heat exchange tube (14) from top to bottom in condensation reheat spray tower (1) in proper order, spray level II (11), water receiving tray (8), spray level I (7) and hot water cistern (5), hot water cistern (5) are located the bottom of condensation reheat spray tower (1), the top of condensation reheat spray tower (1) is equipped with exhanst gas outlet (2), the top lower part of condensation reheat spray tower (1) is equipped with flue gas inlet (6), exhanst gas outlet (2) are located the lateral wall of condensation reheat spray tower above heat exchange tube (14), exhanst gas inlet (6) are located the lateral wall of condensation reheat spray tower between spray level I (7) and hot water spray tower (5);

the hot water reservoir (5) is connected with an inlet of the heat exchange tube (14), and an outlet of the heat exchange tube (14) is connected with the spraying layer I (7);

be equipped with the boiler on economizer (13) and heated the cold water import, the boiler is heated the hot water export, cold water export and hot water import, the solution export of economizer (13) is connected with spraying layer II (11), be sealing connection between the inside wall of water receiving tray (8) and condensation reheat spray tower (1), and the lateral wall of water receiving tray (8) is equipped with stock solution ring (9) with the junction of condensation reheat spray tower (1), the solution import and the stock solution ring (9) of economizer (13) are connected, the interval sets up several flue gas passageway (10) on water receiving tray (8).

2. The cascade heat-carrying flue gas energy-saving, purifying, whitening and energy-saving system as claimed in claim 1, wherein a hydrothermal outlet (4) is provided in a side wall of the hot water reservoir (5), the hydrothermal outlet (4) is communicated with an inlet of the heat exchange tube (14) through a connecting pipeline, and a hot water pump (3) is provided in the connecting pipeline between the hydrothermal outlet (4) and the heat exchange tube (14).

3. The cascade heat-carrying flue gas energy-saving, purifying and energy-saving system as claimed in claim 1, wherein a cold water pump (12) is arranged on a connecting pipeline between a solution outlet of the economizer (13) and the spray level II (11).

4. The cascade heat-carrying flue gas energy-saving purification and whitening energy-saving system as claimed in claim 1, wherein a high-temperature alkaline solution I in the hot water reservoir (5) flows into the heat exchange tube (14), a heat source is provided for the saturated cold flue gas II in the process of flowing in the heat exchange tube (14), the saturated cold flue gas II is reheated and whitened, after the high-temperature alkaline solution I is cooled to be a low-temperature alkaline solution I, a cold source is provided for the saturated hot flue gas, the atomized low-temperature alkaline solution I is cooled and whitened through the spraying layer I (7), and after absorbing heat of the saturated hot flue gas, the low-temperature alkaline solution I is heated to be a high-temperature alkaline solution I which flows into the hot water reservoir (5), so that circulation of the high-temperature alkaline solution I in the system is realized.

5. The cascade heat-carrying flue gas energy-saving, purifying, whitening and energy-saving system as claimed in claim 1, wherein after flowing into the economizer (13), the high-temperature alkaline solution II is cooled to the low-temperature alkaline solution II through waste heat utilization of the economizer (13) to provide a cold source for the saturated cold flue gas I, the atomized low-temperature alkaline solution II is cooled to whiten the saturated cold flue gas I through the spray layer II (11), the low-temperature alkaline solution II absorbs heat of the saturated cold flue gas I and is heated to the high-temperature alkaline solution II, and the high-temperature alkaline solution II flows into the economizer (13) again through the water receiving tray (8), so that circulation of the high-temperature alkaline solution II in the system is realized.

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