CN115264477A - Steam boiler economizer system - Google Patents

Abstract

The application relates to the field of boiler systems, especially relates to a steam boiler economizer system, includes: a boiler; the flash evaporator is connected with the boiler and is used for carrying out flash evaporation on high-temperature water discharged by the boiler and discharging high-temperature steam; the generator is used for receiving the high-temperature steam discharged by the boiler and the flash evaporator; the reactor is connected with the smoke outlet of the boiler, and reaction solution for absorbing water vapor and pollutants in the high-temperature flue gas is sprayed in the reactor from top to bottom; the generator is also used for receiving the reaction solution discharged by the reactor, concentrating the received reaction solution through high-temperature steam and then introducing the concentrated reaction solution into the reactor again; and a cooling pipe for cooling is arranged in the reactor. The application has the effects of reducing energy loss and reducing the environmental pollution caused by the energy loss.

Description

Steam boiler economizer system

Technical Field

The present application relates to the field of boiler systems, and more particularly, to a steam boiler energy saving system.

Background

Industrial boiler products are typically used for power generation, or for gas supply, such as chemical fertilizer plants, which may be steam vaporized, coal-based feedstock, the synthetic fertilizer is a typical industrial boiler, and the industrial boiler is an important thermal power device.

Taking an industrial steam boiler (fuel can be coal, natural gas, biomass and the like) as an example, the energy loss problem exists in the working process, and the main energy loss comprises boiler heat dissipation loss, fuel incomplete combustion loss, smoke exhaust heat loss, pollution discharge heat loss, backwater heat loss and steam exhaust heat loss. The heat dissipation loss of the boiler and the incomplete combustion loss of the fuel can be improved by measures such as improving a combustion mode, modifying a combustion structure, optimizing a matching system, perfecting operation management and the like; but for other types of heat loss it is difficult to address in the above manner; so that the existing industrial boiler still has more energy loss in the using process and is easy to cause environmental pollution.

Disclosure of Invention

In order to reduce energy loss and environmental pollution, the application provides an energy-saving system of a steam boiler.

The application provides a steam boiler economizer system adopts following technical scheme:

a steam boiler economizer system comprising:

a boiler;

the flash evaporator is connected with the boiler and is used for carrying out flash evaporation on high-temperature water discharged by the boiler and discharging high-temperature steam;

the generator is used for receiving the high-temperature steam discharged by the boiler and the flash evaporator;

the reactor is connected with the smoke outlet of the boiler, and reaction solution for absorbing water vapor and pollutants in the high-temperature flue gas is sprayed in the reactor from top to bottom;

the generator is also used for receiving the reaction solution discharged by the reactor, concentrating the received reaction solution through high-temperature steam and then introducing the concentrated reaction solution into the reactor again;

and a cooling pipe for cooling is arranged in the reactor.

Through adopting above-mentioned technical scheme, set up the high temperature flue gas that the reactor produced to the boiler, arrange in order, even arrange and heat supply system's return water and the steam drum in the heat energy in the steam that produces retrieve, heat the boiler feedwater through this part heat energy, energy loss when can reducing the boiler and heat the heating water, reduce energy loss, carry out recycle to this part energy, play better energy-conserving effect.

Optionally, the steam heat accumulator is configured to receive and store high-temperature steam discharged by the boiler and the flash evaporator, and the steam heat accumulator is connected to the generator to introduce the high-temperature steam into the generator;

the steam heat accumulator is used for compensating heat energy when the heat generated by the boiler is insufficient for supplying heat.

By adopting the technical scheme, under the condition that the load of the heating system is small, the high-temperature steam is temporarily stored in the steam heat accumulator and is used for supplying the steam to the generator, and on the other hand, under the condition that the load of the heating system is increased in other periods to cause that the boiler is difficult to meet, the high-temperature steam in the steam heat accumulator is adopted for auxiliary energy supply, so that the problem of insufficient energy supply of the heating system can be reduced, and the operation stability of the system is ensured; and an additional boiler or other equipment is not required to be arranged for supplying energy, so that the waste of energy is reduced.

Optionally, the flash evaporator is further used for receiving high-temperature return water returned by the boiler heat supply cycle;

the flash evaporator is connected with a water treatment device used for purifying high-temperature water and high-temperature return water discharged by the boiler.

By adopting the technical scheme, the water introduced into the flash evaporator is treated, and the problem that impurities contained in the water cause interference to the normal work of subsequent equipment can be reduced.

Optionally, the method further includes:

the secondary heat exchanger is connected with the water outlet end of the cooling pipe and is used for receiving secondary steam discharged by the generator;

and the secondary heat exchanger is used for secondarily heating the water discharged by the cooling pipe and condensing secondary steam discharged by the generator to obtain condensed water.

By adopting the technical scheme, the cooling water discharged from the cooling pipe is heated again by adopting the secondary steam, so that the temperature of part of water is raised to be higher, and the problem of energy loss caused by direct discharge of the secondary steam is also reduced.

Optionally, the system further comprises a recoverer, wherein the recoverer is used for receiving the condensed water generated by the flash evaporator, the generator and the secondary heat exchanger.

Optionally, the reactor includes a reaction box, the cooling pipe is disposed in the reaction box, and both ends of the cooling pipe penetrate through the outside of the reaction box;

a transfer box is arranged at the upper end in the reaction box and connected with the generator to receive the reaction solution concentrated by the generator;

a plurality of liquid discharge ports for discharging reaction solution into the reaction box are formed in the lower side of the transfer box, and a channel for discharging flue gas is formed in the upper side of the transfer box;

the downside of the transfer box is also provided with a plurality of air inlet valves for the flue gas in the reaction box to enter the bottom in the transfer box.

Through adopting above-mentioned technical scheme, the transfer case has been put not with the reaction solution of flue gas contact, and the flue gas contacts the reaction solution contact reaction back of drippage in with the reaction box, lets in to the transfer incasement and contacts with the partial reaction solution that concentration is the highest, has better purifying effect to this partial flue gas, further promotes the cleanliness factor of the flue gas of finally discharging, and is better to the treatment effect of flue gas.

Optionally, injection valves are respectively arranged at positions of the bottom of the transfer box corresponding to the liquid discharge port, and the injection valves are used for dispersedly spraying out the reaction solution in the transfer box.

Through adopting above-mentioned technical scheme, carry out the dispersion of certain degree to reaction solution, reduce the problem that reaction solution is thigh form drippage from the transfer case and appear, increase reaction solution and high temperature flue gas's area of contact, it is better to the effect that high temperature flue gas was handled.

Optionally, an air outlet valve is arranged on the upper side of the transfer box, and the air outlet valve is used for discharging air in the transfer box after the air pressure in the transfer box reaches a set value;

the depth of the reaction solution in the transfer box is maintained within a set threshold.

Through adopting above-mentioned technical scheme for transit case inside remains throughout under certain pressure state, exerts certain pressure to reaction solution wherein through this pressure, guarantees reaction solution from the smooth and easy nature of injection valve discharge process, reduces to appear leading to being difficult to follow the smooth and easy exhaust problem of injection valve because of reaction solution's concentration is great, and simultaneously, it is better to carry out the effect that disperses to reaction solution through the injection valve.

Optionally, a purification box for receiving the dropped reaction solution is arranged at the bottom in the reaction box;

the bottom of the purifying box is provided with a smoke inlet valve for introducing smoke into the bottom of the reaction box and a liquid pumping piece for pumping out reaction solution in the purifying box.

Through adopting above-mentioned technical scheme, the flue gas that initially lets in contacts with the lower reaction solution of the concentration of purifying box stockpile, carries out more abundant utilization to reaction solution, carries out preliminary treatment to the flue gas through this part reaction solution, and follow-up pressure of carrying out purification treatment to the flue gas is also littleer, promotes whole effect of handling the flue gas.

Optionally, a partition plate is vertically fixed in the purification box, the upper side of the partition plate is lower than the opening at the upper side of the purification box, and the internal space of the purification box is partitioned by the partition plate to form a liquid receiving tank and a liquid discharging tank;

the air inlet valve is communicated to the liquid containing groove, and the liquid pumping part is communicated with the bottom of the liquid discharging groove.

Through adopting above-mentioned technical scheme, discharge the partial reaction solution that the concentration is the lowest in the liquid holding tank all the time, can carry out more abundant utilization to reaction solution, also can reduce the phenomenon that the higher reaction solution of concentration is discharged earlier and the lower reaction solution of concentration is remained in the appearance, better to the treatment effect of flue gas.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the reactor is arranged to recover high-temperature flue gas generated by the boiler, return water of a fixed-row and continuous-row heat supply system and heat energy in steam generated in the steam drum, and boiler feed water is heated through the part of heat energy, so that energy loss when the boiler heats the heat supply water can be reduced, energy loss is reduced, the part of energy is recycled, and a better energy-saving effect is achieved;

2. through the arranged transfer box, after the flue gas contacts and reacts with the reaction solution dripped in the reaction box, the flue gas is introduced into the transfer box to contact with the part of the reaction solution with the highest concentration, so that the flue gas purification device has a better purification effect on the part of the flue gas, further improves the cleanliness of the finally discharged flue gas, and has a better treatment effect on the flue gas;

3. through the air outlet valve who sets up for transit case inside remains throughout under certain pressure state, exerts certain pressure to reaction solution wherein through this pressure, guarantees reaction solution from the smooth and easy nature of injection valve discharge process, reduces to appear leading to being difficult to follow the smooth and easy exhaust problem of injection valve because of reaction solution's concentration is great, and simultaneously, it is better to carry out the effect of dispersion to reaction solution through the injection valve.

Drawings

FIG. 1 is an overall schematic view of the boiler economizer system of the present application;

FIG. 2 is a schematic view of the whole reactor.

Description of reference numerals: 1. a boiler; 2. a water treatment device; 3. a flash evaporator; 4. a steam heat accumulator; 5. a generator; 6. a reactor; 61. a reaction box; 62. a cooling tube; 63. a transfer box; 631. an injection valve; 632. an intake valve; 633. an air outlet valve; 64. a purification box; 641. a smoke inlet valve; 642. a liquid bearing tank; 643. a liquid discharge tank; 65. a liquid extracting part; 651. a liquid pump; 652. a liquid pumping pipe; 66. a partition plate; 7. a secondary heat exchanger; 8. a recoverer.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses a steam boiler energy-saving system, referring to fig. 1, the system is used for efficiently recovering heat of each stage in a steam boiler in the existing steam boiler and reducing the problem of energy waste, and the energy-saving system comprises a boiler 1, a water treatment device 2, a flash evaporator 3, a steam heat accumulator 4, a generator 5 and a reactor 6; wherein, the water processor 2 is provided with two liquid inlet communicating ports, one of which is communicated with the boiler 1 through a pipeline, and the boiler 1 discharges high-temperature hot water generated by fixed discharge and continuous discharge into the water processor 2 from the boiler 1; the other liquid inlet communication port is connected with a pipeline system for supplying heat and returning water, so that the heat and returning water is discharged into the water treatment device 2, and the part of the heat and returning water comes from a factory production system or a heating system and the like; the water treatment device 2 is used for treating the discharged water and the heat supply backwater of the boiler 1, so that impurities in the discharged water and the heat supply backwater are removed, and the influence on subsequent treatment processes and equipment is reduced.

The flash evaporator 3 is connected with the discharge port of the water processor 2, after the treated high-temperature water is discharged into the flash evaporator 3 for flash evaporation, part of the high-temperature water is condensed to form condensed water and then discharged, and the rest of the high-temperature water is converted into high-temperature steam and discharged; after being discharged, the condensed water can be stored as drinking water, domestic water, industrial production water and the like, and a discharge port of high-temperature steam on the flash evaporator 3 is connected with the steam heat accumulator 4 so as to discharge the high-temperature steam generated in the flash evaporator 3 into the steam heat accumulator 4; in addition, the steam heat accumulator 4 is also provided with an inlet which is connected with the boiler 1 so as to pump the high-temperature steam part in the steam drum in the boiler 1 into the steam heat accumulator 4.

Set up steam heat accumulator 4 and keep in high-temperature steam, under the less condition of heating system holistic load, power through boiler 1 is enough to satisfy the energy supply requirement promptly when, can follow and extract partial high-temperature steam and carry out energy storage to steam heat accumulator 4 in boiler 1, the load increase of energy supply system in other time quantums and lead to only being difficult to satisfy the energy supply requirement by boiler 1 itself, the high-temperature steam of storage carries out the energy supply in through steam heat accumulator 4, can reduce the problem that appears boiler 1's energy supply not enough in the course of the work, convenient to use person adjusts according to the real-time load of heating system reality, guarantee the stability of steam heating system and equipment operation, and can reduce extravagantly, promote economic nature.

In addition, referring to fig. 1, the bottom of the reactor 6 is connected with a flue at the top of the boiler 1 through a pipeline, high-temperature flue gas generated in the combustion process in the boiler 1 is introduced into the reactor 6 through the bottom of the reactor 6 after being subjected to environmental protection treatment, and an outlet for discharging the flue gas is arranged at the upper side of the reactor 6, so that the high-temperature flue gas forms a passage from bottom to top in the reactor 6; reactor 6 includes reaction box 61 and a plurality of heat exchangers of setting in reaction box 61, the heat exchanger is the cooling tube 62 that snakelike arranging in vertical plane, the cooling tube 62 both ends all pierce through outside to reactor 6, it has the cooling water to circulate in the cooling tube 62, the cooling water is the boiler and gives water, the high temperature flue gas is to the cooling water heating in the cooling tube 62, finally, the high temperature flue gas temperature reduces and discharges from 6 sides of reactor, the cooling water heaies up under the effect of high temperature flue gas and discharges, the realization is to the recovery of the heat energy in the high temperature flue gas, the hot water of production can let in to the heat supply pipeline and be used for the heat supply, water resource etc. as retrieving.

Through the reactor 6 that sets up, retrieve the heat in the high temperature flue gas in the boiler 1, when reducing direct high temperature fume emission and cause the influence to the surrounding environment, realize the recovery to heat energy in the high temperature flue gas, it is extravagant to reduce the energy, realizes better energy-conserving effect.

In addition, a reaction solution is introduced into the reactor 6, the reaction solution drops from top to bottom in the reaction tank 61, and the reaction solution is a viscous liquid and flows down along the outer wall of the cooling pipe 62 in a falling film manner in the dropping process; in the using process, the high-temperature flue gas flows from bottom to top in the reaction box 61 and reversely contacts with the reaction solution dropping from top to bottom, the reaction solution absorbs water vapor and atmospheric pollutants in the high-temperature flue gas to realize further purification treatment of the flue gas, and meanwhile, the reaction solution is gradually diluted from a sticky state and finally discharged from the lower side of the reaction box 61; more heat can be released in the process of absorbing water vapor and atmospheric pollutants by the reaction solution, and the part of heat is absorbed by the cooling water in the cooling pipe 62, so that the effect of recovering the heat energy in the high-temperature flue gas is better.

Referring to fig. 1, a generator 5 is connected to a reaction tank 61 and is used for processing diluted reaction solution discharged from the reaction tank 61, specifically, the diluted reaction solution is discharged into the generator 5, and meanwhile, the generator 5 is also connected to a steam heat accumulator 4, so that high-temperature steam in the steam heat accumulator 4 is discharged into the generator 5; inside the generator 5, the discharged high-temperature steam and the diluted reaction solution generate heat exchange, so that the substances in various states generate corresponding changes, specifically as follows:

1. heating the diluted reaction solution under the heating action of high-temperature steam, heating and evaporating the water in the reaction solution to form secondary steam, and discharging the secondary steam from the generator;

2. after the moisture in the reaction solution is evaporated, the reaction solution is converted into a viscous reaction solution again, and the viscous reaction solution is conveyed to the upper side in the reaction box 61 through a pump or other feeding equipment, so that the falling film process can be carried out again, the treatment and heat exchange of high-temperature flue gas in the reaction box 61 are realized, the reuse of the reaction solution is realized, and the waste problem is reduced;

3. the introduced high-temperature steam is condensed after heat exchange to form condensed water to be discharged, the condensed water and the condensed water formed by the flash evaporator 3 are combined together to be stored as drinking water, domestic water, industrial production water and the like, and the condensed water can also be introduced into the cooling pipe 62 to be used as cooling water and then conveyed into a heating system to be used as heating water, so that the waste of water resources can be reduced, and a better energy-saving effect is achieved; of course, in actual production, the obtained condensed water can be treated according to actual needs.

Referring to fig. 1, the system further comprises a secondary heat exchanger 7, wherein the secondary heat exchanger 7 is connected with the water outlet end of the cooling pipe 62, and the secondary heat exchanger 7 is also connected with the generator 5 for receiving the secondary steam generated in the generator 5; the secondary steam and the cooling drainage are introduced into the secondary heat exchanger 7 for heat exchange, the secondary steam is used for carrying out secondary heating on the cooling water, so that the temperature of the cooling water heated by the high-temperature flue gas is raised again, the cooling water subjected to secondary heating is directly discharged into a heat supply system for heat supply, and energy consumed by heating the water by burning of the boiler 1 is greatly reduced; if the temperature of the cooling water after the secondary heating still does not meet the temperature required by the heating system, the cooling water after the secondary heating can be conveyed into the boiler 1 to be heated again and then is introduced into the heating system to realize heat supply, and compared with the boiler 1, the cooling water with lower temperature is directly heated, so that the heating time is greatly shortened, and the consumption of fuel is also reduced.

The secondary steam is condensed into condensed water after being subjected to heat exchange by the secondary heat exchanger 7, the system is further provided with a recovery device 8 for recovering distilled water generated by the flash evaporator 3, the generator 5 and the secondary heat exchanger 7, and the distilled water generated by the secondary heat exchanger 7 is combined with the condensed water generated by the flash evaporator 3 and the generator 5 for utilization, and can be used according to actual needs.

Through the arrangement, the recovery of high-temperature flue gas generated by the boiler 1, fixed exhaust, continuous exhaust, return water of a heat supply network and heat energy in steam in a steam drum is realized, the boiler 1 is heated by the recovered heat energy, the energy consumed by heating the boiler 1 can be reduced, the energy loss is reduced, the adverse effect of emission on the surrounding environment can be reduced, and a better energy-saving effect is realized; and meanwhile, distilled water can be recycled, so that the problem of water resource waste is reduced.

Referring to fig. 2, a transfer box 63 for storing the reaction solution is fixed at the upper side in the reaction box 61, and the transfer box 63 is connected with the generator 5, so that the newly added reaction solution and the reaction solution concentrated by the generator 5 are discharged into the transfer box 63; transfer case 63 downside has been seted up a plurality of confession reaction solution exhaust leakage fluid dram, and all install an injection valve 631 with the position department that every leakage fluid dram corresponds on the transfer case 63 downside, this injection valve 631 is the check valve, be used for discharging the reaction solution in the transfer case 63 to reaction box 61, and carry out certain dispersion to reaction solution, the phenomenon that reaction solution directly is thigh form drippage appears in the reduction, can increase the area of contact of reaction solution and high temperature flue gas, promote the heat transfer effect, the effect of handling high temperature flue gas is better.

A plurality of air inlet valves 632 are fixed on the lower side surface of the transit box 63, the air inlet valves 632 are also one-way valves, and are used for discharging the flue gas in the reaction box 61 into the transit box 63, and the outlet ends of the air inlet valves 632 are positioned at the bottom in the transit box 63; the upper side of the transit box 63 is provided with a channel for discharging flue gas, and the flue gas introduced into the transit box 63 is discharged out of the reaction box 61.

Referring to fig. 2, a purification box 64 is fixed at the bottom in the reaction box 61, the purification box 64 is of a structure with an open upper side, the bottom is connected with a smoke inlet valve 641 which is connected with the boiler 1 to convey high-temperature smoke in the boiler 1, the smoke inlet valve 641 is a one-way valve, and an outlet at the upper end of the smoke inlet valve is located at the bottom in the reaction box 61; the plurality of smoke inlet valves 641 are uniformly distributed on the bottom surface of the purification box 64, so that the smoke is more uniformly distributed as much as possible when the smoke is introduced into the purification box 64 and the reaction box 61, and the smoke treatment effect of the reaction solution is better; in addition, a liquid-extracting member 65 for extracting and delivering the reaction solution in the reaction tank 61 to the generator 5 is connected to the bottom of the reaction tank.

In a stable working state, a certain amount of reaction solution is kept in the transit box 63 and the purification box 64, and the concentration of the reaction solution from top to bottom is smaller and smaller, namely the treatment capacity of the reaction solution on the flue gas is weaker and weaker; for the flue gas, the purity of the flue gas is higher and higher from bottom to top, namely, the higher part of the flue gas with high temperature contains less moisture and other pollutants;

the reaction solution that drips in the purifying box 64 is the weakest to the throughput of flue gas, but still can absorb a certain amount of moisture and other pollutants, the content of moisture and other pollutants is all the highest in the high temperature flue gas that initially lets in, solution after the dilution through in the purifying box 64 carries out preliminary treatment, can be to the reaction solution make full use of after this part dilutes, more be close to the state of absorbing saturation, carry out the preliminary treatment to the flue gas simultaneously, reduce the pressure that follow-up reaction solution handled the flue gas, follow-up effect to the flue gas is better promptly, guarantee the cleaner of the flue gas of emission.

The flue gas that discharges to upside in the reaction box 61 has reached higher cleanliness factor, and this part flue gas lets in to transit case 63 through the admission valve 632 that sets up in, and the flue gas fully contacts with the highest reaction solution of initial stage concentration, and this part reaction solution is strongest to the throughput of flue gas, carries out purification treatment to the partial flue gas that contains moisture and other pollutant the most at last, can further promote the cleanliness factor of handling the flue gas after accomplishing, and is better to the treatment effect of flue gas.

In addition, referring to fig. 2, an air outlet valve 633 is fixed at a position of a channel for discharging flue gas in the transit box 63, the air outlet valve 633 is a pressure relief valve, and the pressure in the transit box 63 is communicated after reaching a set value to discharge the flue gas in the transit box 63; through the arranged pressure relief valve, in the initial stage after the flue gas is discharged into the transit box 63, the gas outlet valve 633 is in a closed state, after the pressure in the transit box 63 is gradually increased to a set pressure, the gas outlet valve 633 is opened to discharge the flue gas, and under the action of the set pressure, downward pressure is applied to the reaction solution in the transit box, so that the discharge process of the reaction solution is kept smooth, the problem that the reaction solution is difficult to discharge smoothly due to high concentration of the reaction solution is not easy to occur, and under the action of the pressure, the dispersion effect of the reaction solution in the discharge process from the injection valve 631 is better; in practical application, by setting the pressure of the gas outlet valve 633, the flow rate of the injection valve 631 and the flow rate of the reaction solution introduced into the transit box 63, the reaction solution amount in the transit box 63 can be always kept within a constant range, that is, the depth value of the reaction solution therein is maintained within a set threshold value, so as to reduce the problem that the gas outlet valve 633 is blocked or the reaction solution is discharged from the gas outlet valve 633 due to excessive reaction solution, and avoid the phenomenon that the flue gas in the transit box 63 cannot be purified due to too little reaction solution.

Referring to fig. 2, a partition plate 66 is fixed in the purification tank 64 to partition the space in the purification tank 64 into a liquid receiving tank 642 and a liquid discharge tank 643, and the upper edge of the partition plate 66 is lower than the upper opening of the purification tank 64 so that the liquid receiving tank 642 and the liquid discharge tank 643 communicate with each other on the upper side of the partition plate 66; the liquid receiving groove 642 is positioned at the lower side of the cold area pipe and is used for receiving the dropped reaction solution, and the smoke inlet valves 641 are all positioned at the bottom of the liquid receiving groove 642; the liquid drawing unit 65 includes a liquid drawing pump 651 and a liquid drawing pipe 652 fixed between the liquid drawing pump 651 and the purge tank 64, and the liquid drawing pipe 652 communicates with the bottom of the liquid discharge groove 643.

Along with the reaction solution continues to drip, the reaction solution in the liquid holding tank 642 gradually increases, the high temperature flue gas is discharged from the liquid holding tank 642, so that the concentration of the reaction solution in the liquid holding tank 642 also has a difference, wherein the reaction solution with lower concentration is located at the upper layer, along with the gradual rise of the liquid level, the part of the reaction solution is discharged into the liquid discharge tank 643 and is pumped out by the liquid pumping piece 65 to the generator 5 for concentration treatment, so that the reaction solution discharged from the liquid holding tank 642 is the part with the lowest concentration, and the sufficiency of the utilization of the reaction solution is ensured.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. A steam boiler economizer system, comprising:

a boiler (1);

the flash evaporator (3) is connected with the boiler (1) and is used for carrying out flash evaporation on high-temperature water discharged from the boiler (1) and discharging high-temperature steam;

a generator (5) for receiving the high-temperature steam discharged from the boiler (1) and the flash evaporator (3);

the reactor (6) is connected with the smoke outlet of the boiler (1), and reaction solution for absorbing water vapor and pollutants in the high-temperature flue gas is sprayed in the reactor (6) from top to bottom;

the generator (5) is also used for receiving the reaction solution discharged from the reactor (6), concentrating the received reaction solution through high-temperature steam, and then introducing the concentrated reaction solution into the reactor (6) again;

and a cooling pipe (62) for cooling is arranged in the reactor (6).

2. A steam boiler economizer system according to claim 1, wherein: the steam heat accumulator (4) is used for receiving and storing high-temperature steam discharged by the boiler (1) and the flash evaporator (3), and the steam heat accumulator (4) is connected with the generator (5) to introduce the high-temperature steam into the generator (5);

the steam heat accumulator (4) is used for heat energy compensation when the heat generated by the boiler (1) is insufficient for supplying heat.

3. A steam boiler economizer system according to claim 1, wherein: the flash evaporator (3) is also used for receiving high-temperature return water returned by the heat supply circulation of the boiler (1);

the flash evaporator (3) is connected with a water processor (2) used for purifying high-temperature water and high-temperature return water discharged by the boiler (1).

4. A steam boiler economizer system according to claim 1, wherein: further comprising:

the secondary heat exchanger (7) is connected with the water outlet end of the cooling pipe (62) and is used for receiving secondary steam discharged by the generator (5);

the secondary heat exchanger (7) is used for secondarily heating the drain water of the cooling pipe (62) and condensing secondary steam discharged by the generator (5) to obtain condensed water.

5. A steam boiler economizer system according to claim 4, wherein: the system also comprises a recoverer (8), wherein the recoverer (8) is used for receiving condensed water generated by the flash evaporator (3), the generator (5) and the secondary heat exchanger (7).

6. A steam boiler economizer system according to claim 1, wherein: the reactor (6) comprises a reaction box (61), the cooling pipe (62) is arranged in the reaction box (61), and both ends of the cooling pipe penetrate out of the reaction box (61);

the upper end in the reaction box (61) is provided with a transfer box (63), and the transfer box (63) is connected with the generator (5) to receive the reaction solution concentrated by the generator (5);

a plurality of liquid discharge ports for discharging reaction solution into the reaction box (61) are formed in the lower side of the transfer box (63), and a channel for discharging flue gas is formed in the upper side of the transfer box (63);

the lower side surface of the transfer box (63) is also provided with a plurality of air inlet valves (632) for introducing the flue gas in the reaction box (61) to the bottom in the transfer box (63).

7. A steam boiler economizer system according to claim 6, wherein: and injection valves (631) are respectively arranged at positions, corresponding to the liquid discharge ports, of the bottom of the transfer box (63), and the injection valves (631) are used for dispersedly spraying out the reaction solution in the transfer box (63).

8. A steam boiler economizer system according to claim 7, wherein: an air outlet valve (633) is arranged on the upper side of the transit box (63), and the air outlet valve (633) is used for discharging air in the transit box (63) after the air pressure in the transit box (63) reaches a set value;

the depth of the reaction solution in the transfer tank (63) is maintained within a set threshold.

9. A steam boiler economizer system according to claim 1, wherein: a purification box (64) for receiving the dropped reaction solution is arranged at the bottom in the reaction box (61);

the bottom of the purification box (64) is provided with a smoke inlet valve (641) for introducing smoke into the bottom in the reaction box (61) and a liquid extracting part (65) for extracting reaction solution in the purification box (64).

10. A steam boiler economizer system according to claim 9, wherein: a partition plate (66) is vertically fixed in the purification box (64), the upper side of the partition plate (66) is lower than the upper side opening of the purification box (64), and the internal space of the purification box (64) is divided by the partition plate (66) to form a liquid holding tank (642) and a liquid discharging tank (643);

the air inlet valve (632) is communicated to the liquid containing groove (642), and the liquid pumping piece (65) is communicated with the bottom of the liquid discharging groove (643).

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