CN116658886A - Boiler heat energy recovery device - Google Patents

Abstract

The invention discloses a boiler heat energy recovery device which comprises a boiler, a flash evaporator, a heat accumulator, a generator and a falling film absorption reactor, wherein the flash evaporator is communicated with the boiler so as to flash water flowing out of the boiler into steam, one end of the heat accumulator is respectively communicated with the boiler and the flash evaporator so that the steam flowing out of the flash evaporator and the steam flowing out of the boiler flow into the heat accumulator to enable the steam flowing out of the boiler to heat the steam flowing out of the flash evaporator through the heat accumulator, a reaction liquid is arranged in the generator, the generator is communicated with the other end of the heat accumulator so that the steam flowing out of the heat accumulator flows into the generator to heat the reaction liquid to concentrate the reaction liquid, a first inlet is suitable for being led into boiler feed water, a second inlet is communicated with one end of the generator, a third inlet is communicated with the boiler, a first outlet is connected with the other end of the generator, and a second outlet is communicated with the boiler. The invention has the advantages of simple structure, low cost and the like.

Description

Boiler heat recovery device

technical field

The invention relates to the field of boilers, in particular to a boiler heat recovery device.

Background technique

The industrial steam boiler is a heating device that releases heat. It is absorbed by the water wall through radiation heat transfer. The water in the water wall is boiled and vaporized, and a large amount of steam is generated and enters the steam drum for steam-water separation. The separated steam is heated to the required working temperature and Pressure, widely used in heating and heating, chemical industry, food processing, medical industry, pharmaceutical industry and canning industry and other industries with disinfection effect.

In related technologies, industrial steam boilers have large energy losses and low boiler thermal efficiency.

Contents of the invention

The present invention is based on the inventor's discovery and recognition of the following facts and problems:

In the related art, a large amount of energy loss exists in the production and energy supply process of the industrial steam boiler, which causes the thermal efficiency of the boiler to decrease. These energy losses include boiler heat dissipation loss, fuel incomplete combustion loss, exhaust smoke heat loss, sewage heat loss, return water heat loss, and exhaust steam heat loss. Among them, boiler heat dissipation loss and fuel incomplete combustion loss can be improved by improving the combustion method, modifying the combustion structure, optimizing the supporting system, and improving operation management. Among other heat losses, the exhaust heat loss accounts for about 70% of the total loss, which is the direct exhaust flue gas generated by the boiler after environmental protection treatment, which contains water vapor; Bonded with sediment, the steam drum needs to be continuously and regularly discharged, and the temperature of the discharged hot water is as high as 100°C; the heat loss of the exhaust steam is due to the change of the user load. In order to avoid frequent adjustment of the load of the boiler, it will make it operate under a higher load , The excess steam generated is often evacuated, resulting in heat loss. The temperature of the evacuated steam is as high as 140°C; the return water heat loss is the heat loss generated when the return water of the pipe network with a higher temperature is not utilized.

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

For this reason, the embodiment of the present invention proposes a boiler heat recovery device capable of waste heat recovery, water recovery and energy storage, and through cascaded utilization of energy to achieve energy saving, cost reduction and efficiency increase, and integration of source, network, load and storage.

The boiler heat energy recovery device according to the embodiment of the present invention includes: a boiler; a flash evaporator, the flash evaporator communicates with the boiler, so as to flash the high-temperature waste water flowing out of the boiler into steam; a heat accumulator, the heat accumulator One end of both is communicated with the boiler and the flash evaporator, so that the steam flowing out of the flash evaporator and the steam flowing out of the boiler flow into the heat accumulator so that the steam flowing out of the boiler is heated by the heat accumulator The steam flowing out of the flash evaporator; a generator, the generator is provided with a reaction liquid, and the generator is communicated with the other end of the heat accumulator so that the steam flowing out of the heat accumulator flows into the generator To heat the reaction solution so that the reaction solution is concentrated; falling film absorption reactor, the falling film absorption reactor has a first inlet, a second inlet, a third inlet, a first outlet and a second outlet, the The first inlet is suitable for feeding boiler feed water, so that the boiler feed water flows into the falling film absorption reactor, and the second inlet communicates with one end of the generator, so that the reaction liquid flowing out of the generator passes through the first inlet. Two inlets flow into the falling film absorption reactor, and the third inlet communicates with the boiler, so that the flue gas flowing out of the boiler flows into the falling film absorption reactor so that the reaction liquid absorbs the heat in the flue gas and transfer the heat to the boiler feed water, the first outlet is connected to the other end of the generator so that the reaction liquid in the falling film absorption reactor flows into the generator, The second outlet communicates with the boiler so that the water heated by the falling film absorption reactor flows into the boiler.

The boiler heat energy recovery device of the embodiment of the present invention is equipped with a boiler, a flash evaporator, a heat accumulator, a generator and a falling film absorption reactor, so that the water flowing into the boiler 1 can pass through the falling film absorption reactor and the flue gas flowing out of the boiler. Heat exchange is used to initially heat the water flowing into the boiler, thereby effectively utilizing the heat energy of the flue gas, improving the thermal efficiency of the boiler, and reducing the heating cost of the boiler.

In some embodiments, the falling film absorption reactor includes: a housing having a chamber, the first outlet and the third inlet are formed on the housing and communicate with the chamber The first outlet is arranged adjacent to the bottom of the housing so that the reaction liquid in the chamber flows out of the chamber, and the third inlet is arranged adjacent to the bottom of the housing so as to flow out through the boiler The flue gas flows into the chamber through the third inlet; the first spray pipe, at least part of the first spray pipe is arranged in the chamber and extends along the width direction of the housing, the first spray pipe A spray pipe is provided with a first spray port opening downward, and the second inlet is formed at one end of the first spray pipe so that the reaction liquid in the generator passes through the first spray pipe Spray in the chamber; falling film tube, the falling film tube is arranged in the chamber and below the first spray port, so that the reaction solution is sprayed on the falling film tube, the The first inlet is formed at one end of the falling film tube, so that the boiler feed water flows into the falling film tube and exchanges heat with the flue gas in the chamber through the falling film tube, and the second outlet is formed at the falling film tube. The other end of the falling film tube, so that the water heated by the falling film tube flows into the boiler.

In some embodiments, the chamber includes a first chamber and a second chamber that are independent from each other along the up-down direction, and the chamber includes a first sub-chamber and a second sub-chamber that communicate with each other in the up-down direction. The spray pipe and the falling film pipe are arranged in the first sub-cavity, and the second sub-chamber is located below the falling film pipe and is a liquid storage chamber, so as to store the sprayed water from the first spray pipe. The reaction solution, the first outlet is arranged adjacent to the bottom of the second sub-chamber and communicated with the second sub-chamber, the falling film absorption reactor also includes a second spray pipe and a one-way valve, the The second spray pipe is arranged in the second chamber and extends along the width direction of the housing, the second spray pipe is spaced apart from the bottom of the second chamber along the vertical direction, and the second spray pipe The shower pipe is provided with a second spray port, the second spray port is set towards the bottom of the second chamber, and the second spray pipe is suitable for communicating with the boiler feed water so that the boiler feed water can pass through The second spray pipe sprays the second chamber, and the third inlet communicates with the second chamber and is arranged adjacent to the bottom of the second chamber so that the flue gas flowing out of the boiler can pass through The third inlet flows into the second chamber so that the water flowing out of the second spray pipe absorbs the flue gas, and the one-way valve is arranged at the bottom of the first chamber and connected to the second chamber. The cavities are communicated so that the flue gas in the second cavity flows into the first cavity through the one-way valve so that the flue gas heats the water in the falling film tube.

In some embodiments, the housing also has a fourth outlet and a fifth outlet, the fourth outlet is formed on the top of the housing and communicates with the chamber so that the smoke is discharged through the fourth outlet , the fifth outlet communicates with the second chamber and is disposed adjacent to the bottom of the second chamber, so that the liquid in the second chamber is discharged through the fifth outlet.

In some embodiments, the boiler heat recovery device further includes a gas-liquid separator, and the gas-liquid separator is arranged in the fourth outlet, so as to separate the liquid in the flue gas flowing out through the fourth outlet.

In some embodiments, the generator is in communication with the falling film tube such that water flowing out of the generator flows into the falling film tube.

In some embodiments, the boiler heat recovery device further includes a heat exchanger, the heat exchanger has a first channel and a second channel that are independent of each other and capable of heat exchange, and the two ends of the first channel are respectively connected to the The boiler communicates with the falling film tube so that the water in the falling film tube flows into the boiler through the first channel, and the second channel communicates with the generator so that the water flowing out of the generator The secondary steam passes through the second channel to heat the water in the first channel.

In some embodiments, the boiler heat energy recovery device further includes a transfer box, the transfer box has a third channel and a fourth channel that are independent of each other and capable of heat exchange, and the two ends of the third channel are respectively connected to the The first outlet communicates with the generator, so that the reaction solution flowing out of the first outlet flows into the generator through the third channel, and the fourth channel communicates with the generator, so that the reaction liquid flows through the generator. The reaction flowing out of the reactor heats the reaction solution in the third channel through the fourth channel, and the fourth channel is communicated with the second inlet, so that the reaction solution flowing out of the fourth channel flows into the second inlet. import.

In some embodiments, the boiler heat energy recovery device further includes a water processor, and the water processor is respectively communicated with the boiler and the flash evaporator, so that the liquid flowing out of the boiler flows into the water processor through the water processor. inside the flash evaporator.

In some embodiments, the boiler heat energy recovery device further includes heating return water, and the heating return water communicates with the water processor, so that the water flowing out through the heating return water flows into the water processor.

Description of drawings

Fig. 1 is a schematic structural view of a boiler heat recovery device according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of the falling film absorption reactor of the boiler heat energy recovery device according to the embodiment of the present invention.

Boiler heat recovery device 100;

Boiler 1; flash evaporator 2; heat accumulator 3; generator 4; falling film absorption reactor 5; first inlet 51; second inlet 52; third inlet 53; first outlet 54; second outlet 55; shell 56; chamber 561; first cavity 5611; first sub-cavity 56111; second sub-cavity 56112; second cavity 5612; first spray pipe 57; falling film pipe 58; second spray pipe 59; one-way valve 501; fourth outlet 502; fifth outlet 503; heat exchanger 7; transfer box 8; water processor 9; heating return water 10;

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

A boiler heat recovery device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1-2 , a boiler heat recovery device 100 according to an embodiment of the present invention includes a boiler 1 , a flash evaporator 2 , a heat accumulator 3 , a generator 4 and a falling film absorption reactor 5 .

The flash evaporator 2 communicates with the boiler 1 so as to flash the water flowing out of the boiler 1 into steam. Specifically, as shown in Figure 1, the outlet of the boiler 1 communicates with the inlet of the flash evaporator 2, and the sewage generated in the boiler 1 can be discharged into the flash evaporator 2 after being decontaminated by the water processor 9, thereby passing through the flash evaporator 2 The sewage is flash evaporated into low-pressure steam.

One end of the heat accumulator 3 communicates with the boiler 1 and the flash evaporator 2 respectively, so that the steam flowing out of the flash evaporator 2 and the steam flowing out of the boiler 1 flow into the heat accumulator 3, and the steam flowing out of the boiler 1 and the steam flowing out of the flash evaporator 2 can be stored in the storage Heater 3 is mixed to reach the specified temperature and pressure. Specifically, as shown in Figure 1, the accumulator 3 is a steam accumulator, and the inlet of the accumulator 3 communicates with the outlet of the boiler 1 and the inlet of the flash evaporator 2, so that the extra high-temperature steam generated by the boiler 1 to adjust the load and The low-pressure steam generated by the flash evaporator 2 flows into the heat accumulator 3 together, so that the steam is mixed and exchanged in the steam-filled heat accumulator 3 to form a high-quality heat source, and the condensed water in the flash evaporator 2 is directly discharged out of the flash evaporator 2 Or it can be used as supplement of process water directly after treatment.

A reaction liquid is provided in the generator 4, and the generator 4 communicates with the other end of the heat accumulator 3, so that the steam flowing out of the heat accumulator 3 flows into the generator 4 to heat the reaction liquid to concentrate the reaction liquid. Specifically, as shown in Figure 1, the inlet of the generator 4 communicates with the outlet of the heat accumulator 3, so that the steam in the heat accumulator 3 flows into the generator 4, and the heat of the steam can be used to heat the reaction liquid, so that The concentration of the reaction solution is increased to concentrate the reaction solution.

The falling film absorption reactor 5 has a first inlet 51, a second inlet 52, a third inlet 53, a first outlet 54 and a second outlet 55, and the first inlet 51 is suitable for passing into the boiler feed water 101 so that the boiler feed water 101 flows into the falling film absorption reactor. Membrane absorption reactor 5, the second inlet 52 communicates with one end of generator 4, so that the reaction solution flowing out through generator 4 flows in the falling film absorption reactor 5 through the second inlet 52, the third inlet 53 communicates with boiler 1, So that the flue gas flowing out from the boiler 1 flows into the falling film absorption reactor 5 so that the reaction liquid absorbs heat and moisture in the flue gas and transfers the heat to the boiler feed water 101, the first outlet 54 is connected with the other end of the generator 4, In order to allow the reaction solution in the falling film absorption reactor 5 to flow into the generator 4 , the second outlet 55 communicates with the boiler 1 so that the water heated by the falling film absorption reactor 5 can flow into the boiler 1 .

Specifically, as shown in Figure 1, the boiler feed water 101 can flow into the falling film absorption reactor 5 through the first inlet 51, and the second inlet 52 communicates with the outlet of the generator 4, so that the concentrated reaction in the generator 4 can be The liquid flows into the falling film absorption reactor 5, and the third inlet 53 communicates with the flue gas outlet of the boiler 1, so that the flue gas generated in the boiler 1 flows into the falling film absorption reactor 5, so that the reaction liquid absorbs heat and heat in the flue gas. Moisture, thereby increasing the temperature and concentration of the reaction liquid to make full use of the heat in the flue gas, and the boiler feed water 101 is heated by the reaction liquid, and the first outlet 54 communicates with the inlet of the generator 4, so that the falling film The diluted reaction solution in the absorption reactor 5 flows into the generator 4 to be heated and concentrated by the steam in the generator 4, and the second outlet 55 communicates with the water inlet of the boiler 1, thereby delivering the heated boiler feed water 101 to boiler 1.

The boiler heat energy recovery device 100 of the embodiment of the present invention is provided with a boiler 1, a flash evaporator 2, a heat accumulator 3, a generator 4 and a falling film absorption reactor 5, so that the flash evaporator 2, the heat accumulator 3 and the generator 4 absorb the boiler 1, the heat energy of the waste water that flows out, and utilizes its heat energy to heat the reaction liquid of the dilute concentration that falls film absorption reactor 5 flows out so that the low concentration reaction liquid is concentrated into the high concentration reaction liquid, thereby can reuse the reaction liquid, in addition, reduce The membrane absorption reactor 5 is connected to the boiler 1, so that the water flowing into the boiler 1 can exchange heat with the flue gas flowing out of the boiler 1 through the falling film absorption reactor 5, so as to initially heat the water flowing into the boiler 1, and effectively utilize The thermal energy of the flue gas, sewage and steam produced by the boiler 1 is reduced, thereby reducing the boiler exhaust heat loss, sewage heat loss and exhaust steam heat loss, improving the thermal efficiency of the boiler 1, and reducing the heating cost of the boiler 1.

In some embodiments, falling film absorption reactor 5 includes a shell 56 , a falling film tube 58 and a first shower tube 57 .

The housing 56 has a chamber 561, the first outlet 54 and the third inlet 53 are formed on the housing 56 and communicate with the chamber 561, the first outlet 54 is arranged adjacent to the bottom of the housing 56, so that the reaction liquid in the chamber 561 Out of the chamber 561 , the third inlet 53 is disposed adjacent to the bottom of the housing 56 , so that the flue gas flowing out of the boiler 1 flows into the chamber 561 through the third inlet 53 . Specifically, as shown in FIG. 2 , the inner peripheral contour of the chamber 561 is generally a cuboid or a cylinder, and the third inlet 53 is arranged adjacent to the bottom of the casing 56 so that the flue gas in the boiler 1 can pass through the bottom of the casing 56 Flowing into the chamber 561 , the first outlet 54 is disposed adjacent to the bottom of the housing 56 , so that the diluted reaction liquid in the housing 56 can flow out through the first outlet 54 .

At least part of the first shower pipe 57 is located in the chamber 561 and extends along the width direction of the housing 56 (the left-right direction as shown in FIG. 2 ). The shower port, the second inlet 52 is formed at one end of the first shower pipe 57 , so that the reaction liquid in the generator 4 is sprayed into the chamber 561 through the first shower pipe 57 . Specifically, as shown in FIG. 1 , the first shower pipe 57 extends in the left-right direction and is arranged in the chamber 561 , the left end of the first shower pipe 57 extends out of the housing 56 and the second inlet 52 is formed in the first The left end of the shower pipe 57 is located on the outer peripheral surface of the shower pipe in the chamber 561 to be provided with a plurality of first spray ports, and the plurality of first spray ports are arranged at intervals along the left and right direction, and the plurality of first spray ports The opening of is set downward so that the reaction solution can be sprayed in the chamber 561 .

The falling film tube 58 is arranged in the chamber 561 and is located below the first spray port, so that the reaction solution is sprayed on the falling film tube 58, and the first inlet 51 is formed at one end of the falling film tube 58, so that the boiler feed water 101 flows into In the falling film tube 58 and through the falling film tube 58 and the flue gas in the chamber 561, the second outlet 55 is formed at the other end of the falling film tube 58, so that the water heated by the falling film tube 58 flows into the boiler 1 . Specifically, as shown in Figures 1-2, the falling film tube 58 is arranged in the chamber 561 in an S shape and the inlet of the falling film tube 58 communicates with the boiler feed water 101, and the second outlet 55 is located at the lower end of the falling film tube 58, The first inlet 51 is formed on the upper end of the falling film tube 58, so that the boiler feed water 101 flows through the falling film tube 58 in the housing 56 from top to bottom, and the reaction solution is sprayed on the falling film tube 58 to form a thin film. Absorb the heat and moisture in the flue gas and heat the moisture in the falling film tube 58 through the falling film tube 58 .

In some embodiments, the chamber 561 includes a first chamber 5611 and a second chamber 5612 that are independent from each other along the up-down direction, the first chamber 5611 includes a first sub-chamber 56111 and a second sub-chamber 56112 that communicate with each other in the up-down direction, and the second chamber 56112 communicates with each other in the up-down direction. A spray pipe 57 and falling film pipe 58 are arranged in the first sub-cavity 56111, and the second sub-cavity 56112 is located below the falling film pipe 58 and is a liquid storage chamber, so as to accept and store the liquid sprayed by the first spray pipe 57. For the reaction liquid, the first outlet 54 is disposed adjacent to the bottom of the second sub-chamber 56112 and communicates with the second sub-chamber 56112 . Specifically, as shown in FIG. 2 , the chamber 561 is arranged above the second chamber 5612 and the chamber 561 and the second chamber 5612 are not connected, the first subchamber 56111 is arranged above the second subchamber 56112 and the first subcavity The cavity 56111 and the second sub-cavity 56112 communicate with each other, the flue gas communicates in the first cavity and the second cavity through the one-way valve 501, the second sub-cavity 56112 can be used to store the reaction liquid sprayed by the first spray pipe 57, and The first outlet 54 communicates with the second sub-chamber 56112 , so that the reaction solution in the second sub-chamber 56112 can be discharged out of the second sub-chamber 56112 .

The second spray pipe 59 is arranged in the second chamber 5612 and extends along the width direction of the casing 56. The second spray pipe 59 and the bottom of the second chamber 5612 are arranged at intervals along the vertical direction. The second spray pipe 59 is provided with The second spray port, the opening of the second spray port is set towards the bottom of the second cavity 5612, the second spray pipe 59 is suitable for passing into the boiler feed water 101, so that the boiler feed water 101 passes through the second spray pipe 59 to the first The second chamber 5612 is used for spraying, and the third inlet 53 communicates with the second chamber 5612 and is arranged adjacent to the bottom of the second chamber 5612, so that the flue gas flowing out of the boiler 1 flows into the second chamber 5612 through the third inlet 53 to make the second chamber 5612 The water flowing out of the spray pipe 59 absorbs the flue gas. Specifically, as shown in FIG. 2 , the second shower pipe 59 is arranged in the second chamber 5612 and extends along the left and right directions. The second shower pipe 59 is arranged adjacent to the top of the second chamber 5612 . A plurality of second spray ports are provided, and the plurality of second spray ports are arranged at intervals along the left and right directions. The third inlet 53 communicates with the second chamber 5612 and is arranged adjacent to the bottom of the second chamber 5612, so that the smoke flowing out of the boiler 1 Air flows into the second cavity 5612 through the third inlet 53 and is sprayed through the second spray pipe 59 .

The one-way valve 501 is arranged at the bottom of the first cavity 5611 and communicates with the second cavity 5612, so that the flue gas in the second cavity 5612 flows into the first cavity 5611 through the one-way valve 501 so that the flue gas heats the falling film tube 58 of water. Specifically, as shown in FIG. 2, the one-way valve 501 is a gas one-way valve, and there may be multiple one-way valves 501, and the multiple one-way valves 501 are arranged at intervals at the bottom of the chamber 561 and communicate with the second chamber 5612 , so that the flue gas in the second chamber 5612 can flow into the chamber 561 through the gas check valve 501 , and the reaction liquid in the chamber 561 cannot flow into the second chamber 5612 .

In some embodiments, the falling film pipe 58, the first shower pipe 57, the second shower pipe 59 and the one-way valve 501 are multiple, and the multiple second shower pipes 59, the multiple falling film pipes 25 and the A plurality of first pipes 26 are arranged at intervals along the front-rear direction, and a plurality of first spray pipes 57 and a plurality of falling-film pipes 58 are arranged one-to-one correspondingly at intervals in the up-down direction, and a plurality of one-way valves 201 are arranged at intervals along the front-rear direction. It is arranged in multiple rows, and each row of one-way valves 201 includes several one-way valves 201 arranged at intervals along the left and right directions. Thus, the arrangement of the falling film absorption reactor 5 is more reasonable.

The working process of the falling film absorption reactor 5 of the boiler heat energy recovery device 100 of the embodiment of the present invention will be described in detail below.

The first level of absorption: because the flue gas produced after fuel combustion contains water vapor, sulfur dioxide and particulate matter, the flue gas enters the second chamber 5612 through the first inlet 51, and the liquid is in the form of mist from the second spray pipe 59 Or spray in the second chamber 5612 in a drop shape, the liquid is sprayed from top to bottom, and the smoke flows from bottom to top, so that the smoke and liquid are in direct reverse contact, and the first stage of absorption is completed. This process is mainly that the liquid absorbs sulfur dioxide, particulate matter and part of the sensible heat in the flue gas. After that, there is almost no sulfur dioxide and particulate matter in the flue gas, mainly containing a large amount of water vapor, and enters the second stage of absorption. Note that the liquid can be simple water such as boiler feed water 101 or other process water, or lye, depending on the process conditions.

Second-stage absorption: the smoke enters the second sub-chamber 56112 through the one-way valve 501 to start the second-stage absorption. This process is mainly the primary absorption of water vapor in the smoke. The liquid in the second sub-chamber 56112 is The excess reaction liquid in the falling film pipe 58 is sprayed through the first spray pipe 57, and the reaction liquid is a dilute solution formed after deeply absorbing the water vapor in the flue gas. The second sub-cavity 56112 can also provide a buffer space for the circulation of the liquid in the falling film absorption reactor 5 .

Since the reaction liquid in the second subchamber 56112 becomes low concentration after absorbing the water vapor in the flue gas, the absorption effect of the dilute concentration reaction liquid in the second subchamber 56112 is weaker than that of the falling film tube 58. Concentration of the reaction liquid, therefore, the second level of absorption is the primary absorption of flue gas. Finally, the dilute reaction solution in the second sub-cavity 56112 flows into the generator 4 from the first outlet 54 .

Third-stage absorption: the reaction liquid flows into the first sub-cavity 56111 from the first spray port of the first spray pipe 57 and flows to the falling film tube 58, and the reaction liquid flows down in the form of a film outside the falling film tube 58 along the circumferential direction of the tube , gather at the bottom of the horizontal tube and then descend again to hit the next row of tube bundles. During this period, the reaction liquid is in reverse direct contact with the flue gas, absorbs the water vapor in the flue gas, and a third-level deep absorption process occurs. The absorption process releases heat, and the heat generated is transferred to the horizontal tube wall of the falling film tube 58 through the solution to heat the falling film. The boiler feed water 101 flowing in the pipe 58, so as to achieve the purpose of utilizing waste heat. The boiler feed water 101 enters the falling film tube 58 from the inlet of the falling film tube 58 and is heated by the multiple rows of tube bundles of the falling film tube 58 .

In some embodiments, the housing 56 also has a fourth outlet 502 and a fifth outlet 503. The fourth outlet 502 is formed on the top of the housing 56 and communicates with the chamber 561 so that the smoke is discharged through the fourth outlet 502. The outlet 503 communicates with the second chamber 5612 and is disposed adjacent to the bottom of the second chamber 5612 so that the liquid in the second chamber 5612 is discharged through the fifth outlet 503 . Specifically, as shown in Figure 1-2, the fourth outlet 502 is a flue gas outlet, and the flue gas absorbed by the falling film absorption reactor 5 can be discharged out of the housing 56 through the fourth outlet 502, and the fifth outlet 503 is adjacent to The bottom of the second cavity 5612 is set so that the water sprayed by the second spray pipe 59 is discharged out of the casing 56 through the fifth outlet 503 .

In some embodiments, the boiler heat energy recovery device 100 also includes a gas-liquid separator (not shown in the figure), and the gas-liquid separator is arranged in the fourth outlet 502 to separate the liquid. Thus, the moisture in the flue gas flowing out of the falling film absorption reactor 5 can be separated by the gas-liquid separator to ensure that the flue gas flowing out of the falling film absorption reactor 5 is clean unsaturated flue gas, which greatly reduces the risk of subsequent chimney corrosion , improve the service life of the chimney, and the gas-liquid separator can also be used as a part of the chimney.

In some embodiments, the boiler heat energy recovery device 100 further includes a transfer box 8, and the transfer box 8 has a third channel (not shown in the figure) and a fourth channel (not shown in the figure) that are independent of each other and capable of heat exchange. , the two ends of the third passage communicate with the first outlet 54 and the generator 4 respectively, so that the reaction solution flowing out through the first outlet 54 flows into the generator 4 through the third passage, and the fourth passage communicates with the generator 4 so that the The reaction flowing out of the device 4 heats the reaction solution in the third channel through the fourth channel, and the fourth channel communicates with the second inlet 52 so that the reaction solution flowing out through the fourth channel flows into the second inlet 52 . Specifically, as shown in Figure 1, the inlet of the third passage communicates with the first outlet 54, and the outlet of the third passage communicates with the inlet of the generator 4, so that the reaction solution of dilute concentration in the falling film absorption reactor 5 passes through The third channel flows into the generator 4, and the inlet of the fourth channel communicates with the outlet of the generator 4, so that the heated and concentrated reaction solution in the generator 4 flows into the fourth channel, and the reaction solution in the third channel and the fourth channel The reaction solution in the channel is heat-exchanged, so that the temperature of the reaction solution in the third channel increases, the temperature in the fourth channel decreases, and the outlet of the fourth channel communicates with the first spray pipe of the falling film absorption reactor. Thus, the reaction solution after heat exchange and cooling flows into the first spray pipe of the falling film absorption reactor through the fourth channel. Thus, the reaction solution flowing into the generator 4 can be preliminarily heated, so that the dilute solution in the third channel is preheated before entering the generator 4 and enters the generator 4, while the concentrated solution is precooled and enters the falling film absorption In the reactor 5, the concentrated solution at low temperature is beneficial to increase the absorption rate, thereby improving the heat absorption efficiency of the falling film absorption reactor 5.

In some embodiments, the generator 4 communicates with the falling film tube 58 so that the water flowing out of the generator 4 flows into the falling film tube 58 . Specifically, as shown in Figure 1, due to the heat exchange between the steam generated by the heat accumulator 3 and the reaction solution of dilute concentration in the falling film absorption reactor 5 in the generator 4, the temperature of the steam in the generator 4 is reduced And produce condensed water at the same time, the temperature of the reaction liquid of dilute concentration rises and becomes the reaction liquid of concentrated concentration, thus, the outlet of generator 4 is communicated with the inlet of falling film tube 58, and the condensed water in generator 4 can flow into In the falling film pipe 58, to provide water resources to the falling film pipe 58.

In some embodiments, the boiler heat energy recovery device 100 further includes a heat exchanger 7, and the heat exchanger 7 has a first channel (not shown in the figure) and a second channel (not shown in the figure) that are independent of each other and capable of heat exchange. Out), the two ends of the first channel are communicated with the boiler 1 and the falling film tube 58 respectively, so that the water in the falling film tube 58 flows into the boiler 1 through the first channel, and the second channel communicates with the generator 4 so that the water in the falling film tube 58 flows into the boiler 1 through the generator 4 The outgoing secondary steam heats the water in the first channel through the second channel. Specifically, as shown in Figure 1, the inlet of the first channel is communicated with the outlet of the falling film tube 58, and the outlet of the first channel is communicated with the boiler 1 inlet, so that the water heated by the falling film tube 58 flows into the boiler through the first channel In 1, the inlet of the second channel communicates with the outlet of the generator 4. Due to the heat exchange between the steam in the generator 4 and the reaction solution of dilute concentration, the temperature of the reaction solution of dilute concentration rises and concentrates, and the dilute reaction solution produced by concentration The secondary steam flows into the second channel so that the secondary steam in the second channel exchanges heat with the water in the first channel, so that the temperature of the condensed water in the second channel decreases and the temperature of the water in the first channel increases. The steam after heat exchange and cooling in the second channel becomes condensed water, which can be discharged directly or used as a supplement for process water.

In some embodiments, the boiler heat recovery device 100 further includes a water processor 9 , which is respectively communicated with the boiler 1 and the flash evaporator 2 , so that the liquid flowing out of the boiler 1 flows into the flash evaporator 2 through the water processor 9 . Specifically, as shown in Figure 1, the inlet of the water processor 9 is communicated with the outlet of the boiler 1, and the outlet of the water processor 9 is communicated with the inlet of the flasher 2, thus, the waste water produced in the boiler 1 can be treated by water The impurity after the waste water is removed by the device 9 flows into the flash evaporator 2 to prevent the impurity in the waste water in the boiler 1 from blocking the follow-up pipeline.

In some embodiments, the boiler heat energy recovery device 100 further includes heating return water 10 , and the heating return water 10 communicates with the water processor 9 , so that the water flowing out through the heating return water 10 flows into the water processor 9 . Specifically, as shown in Figure 1, since the heating return water 10 has a certain amount of heat, the heating return water 10 can be used as the water source and the waste water generated by the boiler 1 can flow into the flash evaporator 2 through the water processor 9 at the same time, and can also be fully utilized. The heating and return water 10 can be used as heat energy of the waste water produced by the boiler 1, and the heat loss of the heating and return water 10 can be reduced.

The working process of the boiler heat energy recovery device 100 in the embodiment of the present invention will be described in detail below.

The high-temperature sewage generated by the boiler 1 through fixed discharge and continuous discharge flows into the water processor 9 from the boiler 1. In addition, the high-temperature heating return water 10 also flows into the water processor 9. After the water processor 9 is treated by the water processor 9 Into the flash evaporator 23, part of it becomes steam in the flash evaporator 2 and flows into the steam heat accumulator 3, and the other part becomes condensed water in the flash evaporator 2 and is directly discharged from the flash evaporator 2. In addition, the extra high-temperature steam generated by the load adjustment of the industrial boiler 1 flows into the steam accumulator 3 , and at the same time, part of the high-temperature steam extracted from the steam drum of the boiler 1 flows into the steam accumulator 3 . The steam flowing out from the high-temperature steam and flash evaporator 2 flows into the generator 4 from the steam heat accumulator 3 after filling the steam heat accumulator 3 .

The flue gas from boiler 1 is discharged from boiler 1 into the falling film absorption reactor 5 through the third inlet 53 after environmental protection treatment, and the reaction liquid enters the falling film absorption reactor 5 from the second inlet 52. There are three Level absorption, making it more efficient and compact, and greatly reducing the corrosion and wear of the horizontal falling film tube 58 caused by the acid gas and particles contained in the flue gas. The flue gas after treatment is low-temperature, clean and dry unsaturated flue gas It flows out from the fourth outlet 502 to avoid corrosion of the rear chimney.

In order to recycle the working fluid, it is necessary to heat and regenerate the dilute solution flowing out of the first outlet 54 in the generator 45. Preheating the dilute solution before entering the generator 4 can effectively reduce the consumption of high-temperature steam in the generator 4, so setting In the transfer box 8, the low-temperature dilute solution enters the transfer box 8 through the third channel, and the high-temperature concentrated solution regenerated by the generator 4 enters the transfer box 8 through the fourth channel, and heat transfer occurs between the two, so that the dilute solution enters the generator Before 4, preheat the fourth channel and enter the generator 4. At the same time, the concentrated solution is precooled and enters the absorption reactor from the third channel. The low temperature concentrated solution is beneficial to increase the absorption rate. At the same time, the transfer box 8 can be used as a buffer space for solution flow.

In the generator 4, the reaction solution of the dilute solution in the generator 4 exchanges heat with the high-temperature steam flowing out of the heat accumulator 3. After the dilute reaction solution absorbs heat, the water is evaporated and becomes a concentrated reaction solution. After flowing out, it enters the falling film absorption reactor 5 again through the transfer box 8 for circulation. The temperature of the high-temperature steam decreases after heat exchange, and becomes condensed water, which flows out from the generator 4. The condensed water can enter the heating pipeline for heating, as a recovered water resource, and can also be used as the second spray of the falling film absorption reactor 5. The liquid of shower pipe 59. The secondary steam generated by heating the solution is discharged from the generator 4 and then enters the heat exchanger 7, where it exchanges heat with the boiler feed water 101 that has completed primary heating in the falling film tube 58 of the absorption reactor, and the boiler feed water 101 is heated by the secondary steam The secondary heating flows out from the heat exchanger 7 after being heated, and the secondary steam flows out from the heat exchanger 7 after being cooled as recycled water resources.

It is worth noting that the boiler heat energy recovery device 100 in the embodiment of the present invention is all prior art regarding the flow and control of flue gas, steam, and water, and the present invention is not limited. Power is provided, and the solenoid valve is used to control the on-off of the pipeline in the boiler heat energy recovery device 100 .

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

As used herein, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. A feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A boiler heat energy recovery device, comprising:

a boiler;

a flash vessel in communication with the boiler for flashing water exiting the boiler into steam;

the heat accumulator is communicated with the boiler and the flash evaporator at one end respectively, so that steam flowing out of the flash evaporator and steam flowing out of the boiler flow into the heat accumulator to enable the steam flowing out of the boiler to heat the steam flowing out of the flash evaporator through the heat accumulator;

the generator is internally provided with a reaction liquid, and the generator is communicated with the other end of the heat accumulator so that the steam flowing out of the heat accumulator flows into the generator to heat the reaction liquid to concentrate the reaction liquid;

a falling film absorption reactor having a first inlet adapted to be introduced into boiler feed water so that the boiler feed water flows into the falling film absorption reactor, a second inlet communicating with one end of the generator so that reaction liquid flowing out through the generator flows into the falling film absorption reactor through the second inlet, a third inlet communicating with the boiler so that flue gas flowing out through the boiler flows into the falling film absorption reactor so that the reaction liquid absorbs heat in the flue gas and transfers the heat to the boiler feed water, and a first outlet connected with the other end of the generator so that the reaction liquid flowing into the generator through the falling film absorption reactor flows into the boiler, and a second outlet communicating with the boiler so that water heated through the falling film absorption reactor flows into the boiler.

2. The boiler heat energy recovery device according to claim 1, wherein the falling film absorption reactor comprises:

a housing having a chamber, the first outlet and the third inlet being formed on the housing and communicating with the chamber, the first outlet being disposed adjacent a bottom of the housing so that a reaction liquid in the chamber flows out of the chamber, the third inlet being disposed adjacent the bottom of the housing so that flue gas flowing out through the boiler flows into the chamber through the third inlet;

the first spraying pipe is at least partially arranged in the cavity and extends along the width direction of the shell, the first spraying pipe is provided with a first spraying opening with a downward opening, and the second inlet is formed at one end of the first spraying pipe, so that the reaction liquid in the generator is sprayed in the cavity through the first spraying pipe;

the falling film pipe is arranged in the cavity and is positioned below the first spraying port so that the reaction liquid is sprayed on the falling film pipe, the first inlet is formed at one end of the falling film pipe so that boiler feed water flows into the falling film pipe and exchanges heat with flue gas in the cavity through the falling film pipe, and the second outlet is formed at the other end of the falling film pipe so that water heated by the falling film pipe flows into the boiler.

3. The heat recovery device of claim 2, wherein the chamber comprises a first chamber and a second chamber which are independent from each other in the up-down direction, the first chamber comprises a first sub-chamber and a second sub-chamber which are communicated with each other in the up-down direction, the first spray pipe and the falling film pipe are arranged in the first sub-chamber, the second sub-chamber is arranged below the falling film pipe and is a liquid storage chamber so as to store the reaction liquid sprayed by the first spray pipe, the first outlet is arranged adjacent to the bottom of the second sub-chamber and is communicated with the second sub-chamber,

the falling film absorption reactor further comprises a second spray pipe and a one-way valve, wherein the second spray pipe is arranged in the second cavity and extends along the width direction of the shell, the second spray pipe and the bottom of the second cavity are arranged at intervals along the up-down direction, the second spray pipe is provided with a second spray opening, the second spray opening faces the bottom of the second cavity, the second spray pipe is suitable for being communicated with boiler water supply, so that boiler water supply sprays the second cavity through the second spray pipe, the third inlet is communicated with the second cavity and is arranged adjacent to the bottom of the second cavity, so that flue gas flowing out of the boiler flows into the second cavity through the third inlet to enable the second spray pipe to flow out to absorb the flue gas, and the one-way valve is arranged at the bottom of the first cavity and is communicated with the second cavity, so that flue gas in the second cavity flows into the first cavity through the one-way valve to enable the water in the falling film to heat the flue gas.

4. A boiler heat energy recovery device according to claim 3, wherein the housing further has a fourth outlet formed at the top of the housing and communicating with the chamber so that the flue gas is discharged through the fourth outlet, and a fifth outlet communicating with the second chamber and disposed adjacent the bottom of the second chamber so that the liquid in the second chamber is discharged through the fifth outlet.

5. The boiler heat energy recovery device according to claim 4, further comprising a gas-liquid separator provided in the fourth outlet for separating liquid in the flue gas flowing out through the fourth outlet.

6. The boiler heat energy recovery device of claim 2 wherein the generator is in communication with the falling film tube such that water flowing out of the generator flows into the falling film tube.

7. A boiler heat energy recovery apparatus according to claim 3, further comprising a heat exchanger having a first passage and a second passage which are independent of each other and heat-exchange-enabled, both ends of the first passage being respectively communicated with the boiler and the falling film pipe so that water in the falling film pipe flows into the boiler through the first passage, and the second passage being communicated with the generator so that secondary steam flowing out through the generator heats water in the first passage through the second passage.

8. The heat recovery device of claim 1, further comprising a transfer box having a third channel and a fourth channel which are independent of each other and can perform heat exchange, both ends of the third channel being respectively communicated with the first outlet and the generator so that the reaction liquid flowing out through the first outlet flows into the generator through the third channel, the fourth channel being communicated with the generator so that the reaction liquid flowing out through the generator heats the reaction liquid in the third channel through the fourth channel, and the fourth channel being communicated with the second inlet so that the reaction liquid flowing out through the fourth channel flows into the second inlet.

9. The boiler heat energy recovery device of claim 1 further comprising a water treater in communication with the boiler and the flash vessel, respectively, such that liquid exiting through the boiler flows into the flash vessel through the water treater.

10. The boiler heat energy recovery device of claim 9 further comprising heating return water in communication with the water processor such that water flowing out of the heating return water flows into the water processor.