Boiler system

Abstract

The utility model relates to a boiler system which comprises a boiler, an ash hopper, a waste water inlet header pipe and a boiler bottom spraying device. A hearth serving as a combustion space is arranged in the middle of the boiler, the portion, located below the hearth, of the boiler is a boiler bottom, and an opening is formed in the bottom of the boiler bottom. The ash hopper is located below the boiler bottom of the boiler, and an opening of the ash hopper is connected with an opening of the boiler bottom. Desulfurization waste water is led to the boiler bottom spraying device through the waste water inlet main pipe, then atomized by the boiler bottom spraying device and sprayed to the boiler bottom of the boiler and / or the upper portion of an ash hopper. The furnace bottom spraying device atomizes and sprays the wastewater into the furnace bottom and the upper part of the ash hopper, so that the wastewater is in contact with ash falling from a hearth, waste heat of the furnace bottom evaporates spray moisture, crystals of harmful substances in the wastewater are separated out, the crystals are adsorbed by the slag and the ash and fall into the ash hopper together, and the treatment of the desulfurization wastewater is completed. Compared with the prior art, a heat exchange device does not need to be additionally installed, and space and energy consumption are saved.

Description

Technical Field

[0001] This utility model relates to the technical field of desulfurization wastewater treatment in thermal power plants, and in particular to a boiler system. Background Technology

[0002] Boilers are one of the core pieces of equipment in thermal power generation. During coal combustion, boilers produce large amounts of sulfur-containing harmful gases. To reduce the environmental pollution caused by these gases, flue gas desulfurization (FGD) processes are typically used to degrade sulfur dioxide in the flue gas. However, this process generates desulfurization wastewater. This wastewater contains various pollutants, such as suspended solids, supersaturated sulfites, sulfates, and heavy metals, many of which are Class I pollutants that are subject to strict control under national environmental standards. Direct discharge of this wastewater would cause serious environmental pollution. Therefore, it is necessary to treat the desulfurization wastewater to remove pollutants before it can be discharged.

[0003] Currently, the common method for treating desulfurization wastewater is to spray it back into the furnace. Specifically, for example... Figure 1As shown, the boiler system in the prior art for treating desulfurization wastewater includes a boiler, a concentration pretreatment device 152, a heat exchange device 16, an atomization device 17, a superheater 18, and a soot blower 19. The middle part of the boiler is a hearth 11 as a main combustion space, the part below the hearth 11 is a furnace bottom 12 for discharging ash, and the part above the hearth 11 is a flue 13 for discharging smoke. The bottom of the furnace bottom 12 is provided with an opening, an ash bucket 14 is arranged below the furnace bottom 12 of the boiler, the opening of the ash bucket 14 is connected with the opening of the furnace bottom 12, and the ash bucket 14 is used for receiving the ash and coking falling from the hearth 11 and the furnace bottom 12. The ash bucket 14, the furnace bottom 12, the hearth 11 and the flue 13 are sequentially communicated. Meanwhile, the boiler also includes a coal conveying passage for conveying the coal used for combustion to the hearth 11 of the boiler. The concentration pretreatment device 152, the heat exchange device 16 and the atomization device 17 are sequentially communicated through pipelines, and the atomizer is communicated with the hearth 11. The desulfurization wastewater is sequentially subjected to concentration through the concentration pretreatment device 152, heating through the heat exchange device 16, and atomization and injection into the hearth 11 of the boiler through the atomization device 17. The heat in the hearth 11 makes the water mist of the desulfurization wastewater evaporate rapidly, the sulfur-containing pollutants in the wastewater are crystallized and out, and are adsorbed by the coking and slag on the inner wall of the hearth 11. The superheater 18 is installed in the flue 13 and is used for heating the steam generated in the combustion process of the boiler again, and the steam after being heated again is guided to the soot blower 19 for utilization. The soot blower 19 is installed outside the hearth 11 and is communicated with the hearth 11, the soot blower 19 sprays the steam from the superheater 18 into the hearth 11 to drive the air in the hearth 11 to form a high-speed airflow. The shear force and impact force generated by the high-speed airflow make the ash and coking fall off from the inner wall of the hearth 11, and finally the slag and coking adsorbing the sulfur-containing crystals from the desulfurization wastewater are blown off by the soot blower 19 and fall into the ash bucket 14 below the furnace bottom 12.

[0004] However, the boiler system in the prior art for treating desulfurization wastewater has a large overall occupied space and a high operation and maintenance cost. Practical new type content

[0005] Therefore, the purpose of the present application is to overcome the defects or deficiencies of the prior art and provide a boiler system.

[0006] A boiler system, characterized in that it comprises a boiler, an ash bucket, a wastewater inlet main pipe and a furnace bottom spraying device; the middle part of the boiler is a hearth as a combustion space, the part below the hearth of the boiler is a furnace bottom, and the bottom of the furnace bottom is provided with an opening; the ash bucket is located below the furnace bottom of the boiler, and the opening of the ash bucket is connected with the opening of the furnace bottom; the desulfurization wastewater is guided to the furnace bottom spraying device through the wastewater inlet main pipe, and then is atomized and sprayed onto the furnace bottom and / or the upper part of the ash bucket of the boiler by the furnace bottom spraying device.

[0007] The furnace bottom spraying device atomizes and sprays the waste water into the upper part of the furnace bottom and the ash bucket, so that the waste water contacts with the ash and coking falling from the furnace, the residual heat of the furnace bottom evaporates the sprayed water, the crystals of harmful substances in the waste water are separated out, the crystals are adsorbed by the ash and coking and fall into the ash bucket together with the ash and coking, and the treatment of the desulfurization waste water is completed. Compared with the prior art, the new type does not need to additionally install a heat exchange device, space and energy consumption are saved, and the influence on the fly ash with high recycling value in the flue is avoided.

[0008] Further, the furnace bottom spraying device comprises a furnace bottom waste water branch pipe and a spraying pipeline surrounding the inner wall of the furnace bottom and / or the inner wall of the upper part of the ash bucket; the furnace bottom waste water branch pipe is in communication with the waste water inlet main pipe and the spraying pipeline respectively; the surface of the spraying pipeline is provided with a plurality of spray heads which are spaced apart and face the central axis direction of the furnace bottom or the ash bucket; after the desulfurization waste water enters the spraying pipeline, the waste water is atomized by the spray heads and sprayed to the furnace bottom and / or the upper part of the ash bucket of the boiler.

[0009] Further, a compressed air main pipe is further arranged, and compressed air is introduced into the furnace bottom spraying device through the compressed air main pipe; the furnace bottom spraying device further comprises a compressed air branch pipe which is in communication with the compressed air main pipe and the furnace bottom waste water branch pipe respectively. Through the above structural improvement, the compressed air pipeline is added, and the compressed air is sprayed to the waste water pipeline to clean the blocked substances in the pipeline.

[0010] Further, the furnace bottom spraying device comprises at least two spraying pipelines; the furnace bottom waste water branch pipe comprises at least two water outlets; each spraying pipeline is connected with the water outlet of at least one furnace bottom waste water branch pipe. By increasing the number of spraying pipelines, the ash can be more fully contacted with the atomized waste water, and the treatment efficiency is improved.

[0011] Further, the furnace bottom spraying device comprises at least one furnace bottom waste water branch pipe and at least one compressed air branch pipe; each furnace bottom waste water branch pipe is connected with at least one compressed air branch pipe. By using a plurality of waste water pipelines to transport waste water to the spraying pipeline, the waste water flows into different parts of each spraying pipeline, so that the spraying pressure of each position of each spraying pipeline is more uniform.

[0012] Further, a waste water control main valve is further arranged on the waste water inlet main pipe; an adjusting valve is arranged on the furnace bottom waste water branch pipe; when the water outlet of the furnace bottom waste water branch pipe is provided with at least two water outlets, the adjusting valve is arranged upstream of the bifurcation position of the at least two water outlets; a compressed air control valve is arranged on the compressed air main pipe; and a main control unit is further arranged and electrically connected with the waste water control main valve, the adjusting valve and the compressed air control valve. Through the above improvement, the treatment of the desulfurization waste water can be adjusted according to the situation.

[0013] Further, the boiler further comprises a coal conveying passage and a coal feeder, the coal feeder is located outside the furnace, the coal conveying passage is connected with the coal feeder and the furnace of the boiler respectively, and the coal is transported from the coal feeder to the furnace through the coal conveying passage; the detection device electrically connected with the total control unit; the detection device comprises one or more of a humidity meter, an ash detection device and a coal type analysis device; wherein the humidity meter and the ash detection device are arranged in the ash bucket, and the coal type analysis device is arranged in the coal conveying passage and / or the coal feeder of the boiler.

[0014] Further, it further comprises a superheater, a steam main pipe communicated with the superheater, a steam branch pipe communicated with the steam main pipe, a soot blowing nozzle arranged at the steam outlet end of the steam branch pipe and extending into the furnace, and a furnace waste water branch pipe; the furnace waste water branch pipe is communicated with a waste water inlet main pipe downstream of a waste water control main valve and a steam branch pipe upstream of the soot blowing nozzle respectively; the desulfurization waste water is introduced into the steam branch pipe through the furnace waste water branch pipe, the desulfurization waste water is combined with steam introduced from the superheater by the steam main pipe in the steam branch pipe, and after the desulfurization waste water is heated by the steam in the steam branch pipe, the desulfurization waste water is atomized and sprayed into the boiler furnace by the soot blowing nozzle together with the steam. The heat in the furnace evaporates the water in the desulfurization waste water, the precipitated crystals are contacted with and adsorbed by the slag or ash knocked down by the steam, and fall into the ash bucket together.

[0015] Further, the steam control main valve is arranged on the steam main pipe; the steam control branch valve is arranged on the steam branch pipe upstream of the steam and the desulfurization waste water; the furnace waste water control branch valve and the pressure reducing valve are arranged on the furnace waste water branch pipe in sequence along the water flow direction; and the total control unit is electrically connected with the steam control main valve, the steam control branch valve, the furnace waste water control branch valve and the pressure reducing valve respectively.

[0016] Further, the angle between the steam branch pipe and the furnace waste water branch pipe is an acute angle; a connecting pipe is further arranged to connect the steam branch pipe and the furnace waste water branch pipe, the connection position of the connecting pipe and the furnace waste water branch pipe is located between the combination position of the desulfurization waste water and the steam and the pressure reducing valve; the connection position of the connecting pipe and the steam branch pipe is located between the steam control branch valve and the combination position of the desulfurization waste water and the steam; and a check valve is arranged on the connecting pipe, so that the steam in the steam branch pipe can be introduced into the furnace waste water branch pipe through the connecting pipe, and the desulfurization waste water in the furnace waste water branch pipe cannot be introduced into the steam branch pipe through the connecting pipe. The above improvement ensures that the desulfurization waste water can smoothly enter the steam branch pipe and combine with the steam, and prevents blockage; when the furnace waste water branch pipe is not connected with the desulfurization waste water, the check valve can make the steam in the steam branch pipe blow into the furnace waste water branch pipe through the connecting pipe, and clean the blockage in the furnace waste water branch pipe.

[0017] In order to better understand and implement, the utility model is described in detail below in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of a boiler system in the prior art

[0019] Figure 2 is a structural schematic diagram of a boiler system according to the present application;

[0020] Figure 3 is a structural schematic diagram of a furnace bottom spraying device in one embodiment;

[0021] Figure 4 is a connection schematic diagram of a general control unit of the system according to the present application;

[0022] Figure 5 is an enlarged schematic diagram of a furnace waste water branch pipe and a soot blower connection structure.

[0023] Reference signs: 11 furnace, 12 furnace bottom, 13 flue, 14 ash hopper, 151 water storage tank, 152 concentration pretreatment device, 16 heat exchange device, 17 atomizing device, 18 superheater, 19 soot blower, 20 waste water inlet main pipe, 21 inlet pump, 23 slurry pump, 24 waste water control main valve, 30 compressed air main pipe, 31 air compression device, 32 compressed air control valve, 41 spraying pipe, 411 spraying head, 42 furnace bottom waste water branch pipe, 421 adjusting valve, 43 compressed air branch pipe, 52 steam main pipe, 521 steam control main valve, 531 furnace waste water branch pipe, 5311 furnace waste water control sub-valve, 5312 pressure reducing valve, 532 steam branch pipe, 5321 steam control sub-valve, 533 soot blowing nozzle, 54 connecting pipe, 541 check valve. DETAILED DESCRIPTION

[0024] As Figure 1The utility model discloses an analysis of the reason why the boiler system that can handle desulfurization wastewater in prior art occupies larger space and needs higher operation and maintenance cost, thinks that too many equipment are installed outside the boiler, which leads to large space occupation and high energy consumption of the whole system, and further leads to high operation and maintenance cost. For example, why need to install heat exchange device 16, because the temperature in furnace 11 is high, in order to avoid the desulfurization wastewater sprayed to reduce the temperature of furnace 11 and affect the operation of the boiler, and avoid thermal expansion and contraction to cause damage to the boiler equipment, need to use heat exchange device 16 to heat and treat desulfurization wastewater. Why need to install atomizing device 17, because it is necessary to form fine wastewater droplets as much as possible, which is beneficial to the rapid evaporation of water, avoids too much liquid desulfurization wastewater to reduce the temperature of furnace 11, affects the combustion in the boiler, and also ensures the treatment effect and efficiency of desulfurization wastewater. Why need to install soot blower 19, to knock off the coking and slag attached to the inner wall of the furnace, which adsorbs sulfur-containing crystals in desulfurization wastewater, so that the sulfur-containing crystals are removed together with the coking and slag. The superheater 18 is set in cooperation with the operation of the soot blower 19, and is used for blowing the water vapor in the heating flue by the soot blower. The installation of numerous devices leads to the problem of large space occupation of the whole boiler system, and the operation and maintenance of these devices also brings the problems of large energy consumption and high operation and maintenance cost.

[0025] Through further analysis, the heat exchange device 16 for heating desulfurization wastewater occupies more space and consumes more energy. If the desulfurization wastewater is sprayed at a position with lower temperature and sufficient to evaporate the desulfurization wastewater mist quickly, the installation of heat exchange device 16 can be reduced first. In the boiler, the positions with lower temperature but sufficient residual temperature to meet the above requirements include flue 13 and furnace bottom 12. And the fly ash in the flue and the ash and coking falling from the furnace in the furnace bottom all have the ability to adsorb wastewater sulfur-containing crystal. However, the fly ash in the flue has high recycling value after recovery. Fly ash can be co-fired with lime, gypsum and other raw materials to produce cement clinker, which is used in cement production, road construction, brick production and other fields, and can also be used for soil improvement and filling materials. The adsorption of desulfurization wastewater crystals will affect the recycling of fly ash. The ash and coking in the furnace bottom 12 and the ash bucket 14 have the adsorption ability, but the recycling value is low.

[0026] Therefore, the utility model discloses at least one circle high temperature resistant pipe with spraying function is arranged on the inner wall of furnace bottom 12 and the upper inner wall of ash hopper 14, is used for atomizing and spraying waste water into furnace bottom 12 and the upper portion of ash hopper 14, makes waste water contact with ash and coking that drop from furnace, and lets the waste water evaporation spray moisture of furnace bottom 12, and the crystallization of harmful sulfur-containing of waste water is separated out, and the crystallization is adsorbed by ash and drops into ash hopper with ash, and the treatment of desulfurization waste water is completed.Compared with prior art, the utility model discloses need not additional installation heat exchange device 16, and because furnace bottom 12 is not the main combustion space, even if the water droplet of spraying is not enough fine, causes the cooling of furnace bottom 12 to a certain extent, also will not bring the big influence to the normal operation of boiler, can not apply to the special atomizing device of large ground space, and only needs to use different spray head atomization can. According to the boiler system of the above-mentioned conception improvement compared with the boiler system in prior art, the space and energy consumption demand of equipment occupied are saved, and the influence to the high recovery value fly ash in flue 13 is avoided. Further, the utility model discloses that desulfurization waste water is easy to cause the blockage of waste water pipeline in pipeline, therefore the utility model further improves, increases compressed air pipeline, and the material that is blocked in the pipeline is cleaned through the compressed air that is sprayed to waste water pipeline.

[0027] The scheme of the utility model will be described in detail in connection with the drawings.

[0028] The utility model provides a kind of boiler system, including boiler, water reservoir 151, waste water inlet main pipe 20, compressed air main pipe 30, superheater 18, steam main pipe 52, soot blower 19 and furnace bottom spraying device;The middle part of boiler is hearth 11 as main combustion space, the part below hearth 11 is furnace bottom 12 for discharging ash, the part above hearth 11 is flue 13 for discharging smoke.The bottom of furnace bottom 12 has opening, ash bucket 14 is arranged below furnace bottom 12, the opening of ash bucket 14 is connected with the opening of furnace bottom 12, and ash bucket 14 is used to receive ash and coking falling from hearth 11 and furnace bottom 12.Ash bucket 14, furnace bottom 12, hearth 11 and flue 13 are sequentially communicated.Boiler further includes coal conveying channel and coal feeder (not shown in the figure), and the coal feeder is located outside hearth 11, the output end of the coal conveying channel is communicated with hearth 11, and the input end extends to the outside of hearth 11 and is connected with the coal feeder, the coal feeder inputs coal into the coal conveying channel, and the coal conveying channel transports coal for combustion to hearth 11 for combustion.The boiler is a conventional boiler, which is not described here.Water inlet end of waste water inlet main pipe 20 is communicated with water reservoir 151 storing desulfurization waste water, and water outlet end is communicated with furnace bottom spraying device, and waste water inlet main pipe 20 leads desulfurization waste water to furnace bottom spraying device.Furnace bottom spraying device is arranged on the upper part of furnace bottom 12 and / or ash bucket 14 of boiler, for atomizing desulfurization waste water, and spraying to furnace bottom and upper part of ash bucket 14.Superheater 18 reheats steam in flue 13, steam main pipe 52 leads steam of superheater 18 into soot blower 19, soot blower 19 sprays steam into hearth, and blows ash and coking in hearth.Furnace bottom waste heat evaporates water of waste water spraying, and precipitates harmful sulfur-containing substance crystal in waste water, and the crystal combines with ash and / or coking falling from hearth 11, and ash and coking in hearth are blown off by soot blower, finally, ash and / or coking with sulfur-containing substance crystal of desulfurization waste water are absorbed and fall into ash bucket 14, and the treatment of desulfurization waste water is completed.Compressed air main pipe 30 can spray compressed air into furnace bottom spraying device when not spraying desulfurization waste water, to clean the blockage in furnace bottom spraying device.

[0029] Specifically, the superheater 18 is installed in the flue 13 of the boiler to reheat the steam in the flue 13, and the superheater 18 is a conventional superheater installed in the flue 13 of the boiler. The steam header 52 is connected to the superheater 18 at an inlet end and connected to the sootblower 19 at an outlet end, and the steam header 52 is provided with a steam control master valve 521 for controlling the on-off and flow rate of the steam in the steam header 52. The steam from the superheater 18 is led out to the sootblower 19 through the steam header 52 in the same way as the conventional way of leading the steam from the superheater 18 to the sootblower 19, and thus the details are not described herein. The sootblower 19 comprises a steam branch pipe 532 and a sootblower nozzle 533. The steam branch pipe 532 is connected to the steam header 52 at an inlet end, and the steam branch pipe 532 is provided with a steam control sub-valve 5321 for controlling the on-off and flow rate of the steam in the steam branch pipe 532. The sootblower nozzle 533 is arranged at an outlet end of the steam branch pipe 532, and the sootblower nozzle 533 extends into the furnace 11 of the boiler. The steam passes through the steam header 52 and the steam branch pipe 532 in sequence, and is finally sprayed into the furnace 11 of the boiler through the sootblower nozzle 533 to blow off the ash and coking on the inner wall of the furnace 11 and finally drop into the ash hopper 14 below the furnace bottom 12.

[0030] The inlet end of the wastewater inlet header 20 is connected to the wastewater storage tank 151 storing the desulfurization wastewater, and the outlet end is connected to the furnace bottom spraying device. As shown in Figure 2 The wastewater inlet header 20 is provided with an inlet pump 21, a conventional concentration pretreatment device 152, a slurry pump 23, and a wastewater control master valve 24 in sequence along the water flow direction. The inlet pump 21 is used to pump the desulfurization wastewater from the wastewater storage tank 151 into the wastewater inlet header 20; the concentration pretreatment device 152 is used to concentrate the desulfurization wastewater to obtain thick desulfurization wastewater, and in this embodiment, the water content of the desulfurization wastewater is reduced to below 45%; the slurry pump 23 is used to pump the thick desulfurization wastewater after concentration to the downstream pipeline; and the wastewater control master valve 24 is used to control the on-off and flow rate of the desulfurization wastewater in the downstream pipeline. The inlet of the compressed air header 30 is connected to a conventional air compression device 31, and the outlet is connected to the furnace bottom spraying device; the compressed air header 30 is provided with a compressed air control valve 32 for controlling the on-off and flow rate of the compressed air.

[0031] Each of the furnace bottom spraying devices comprises at least one spraying pipeline 41 arranged around the inner wall of the furnace bottom 12 and / or the inner wall of the upper part of the ash hopper 14, at least one furnace bottom wastewater branch pipe 42, and at least one compressed air branch pipe 43. The spraying pipeline 41 is a high-temperature-resistant pipeline through which the desulfurization wastewater can pass, and the surface of the spraying pipeline 41 is provided with a plurality of spray heads 411 uniformly and spacedly arranged towards the central axis direction of the furnace bottom or the ash hopper 14, for atomizing the desulfurization wastewater in the spraying pipeline 41 and spraying it towards the central axis direction of the furnace bottom and the ash hopper 14.

[0032] AsFigure 2 and Figure 3 As shown, the inlet of each of the furnace bottom wastewater branch pipes 42 is connected to the outlet of the wastewater inlet main pipe 20, with the connection point downstream of the wastewater control main valve 24. Each furnace bottom wastewater branch pipe 42 is equipped with an adjusting valve 421 to adjust the flow and on / off status of the wastewater within it. Each furnace bottom wastewater branch pipe 42 has at least one outlet. When the number of outlets is set to at least two, the branching point of these two outlets is downstream of the adjusting valve 421. The adjusting valve 421 can then adjust the flow rate of the desulfurization wastewater at all outlets of the furnace bottom wastewater branch pipe 42. Each ring of spray pipes 41 is connected to at least one outlet of the furnace bottom wastewater branch pipe 42. The furnace bottom wastewater branch pipes 42 are used to lead desulfurization wastewater from the wastewater inlet main pipe 20 to each ring of spray pipes 41. By adjusting the adjusting valve 421, the flow rate of the desulfurization wastewater flowing to the spray pipes 41 can be adjusted. Each wastewater branch pipe 42 at the bottom of the furnace is connected to at least one compressed air branch pipe 43.

[0033] The air inlet of each compressed air branch pipe 43 is connected to the compressed air main pipe 30 downstream of the compressed air control valve 32. The air outlet of each compressed air branch pipe 43 is connected to a furnace bottom wastewater branch pipe 42, and the connection position is downstream of the adjusting valve 421 of the furnace bottom wastewater branch pipe 42. When the number of outlets of the furnace bottom wastewater branch pipe 42 is set to at least two, the connection position is located between the bifurcation position of the more than one outlet and the adjusting valve 421.

[0034] In one embodiment, such as Figure 3 As shown, the furnace bottom spraying device has two rings of spray pipes 41, one ring located on the inner wall of the furnace bottom and the other ring located on the inner wall of the opening of the ash hopper 14. The spray pipe 41 located on the furnace bottom has 20 evenly spaced nozzles 411; the spray pipe 41 located at the opening of the ash hopper 14 has 12 evenly spaced nozzles 411. The furnace bottom spraying device has only one furnace bottom wastewater branch pipe 42 and one compressed air branch pipe 43. The furnace bottom wastewater branch pipe 42 has two outlets, which are connected to the two rings of spray pipes 41 respectively. The air outlet of the compressed air branch pipe 43 is connected to the furnace bottom wastewater branch pipe 42, with the connection point between the bifurcation of the two outlets of the furnace bottom wastewater branch pipe 42 and the adjusting valve 421.

[0035] In another embodiment, the furnace bottom spraying device is also provided with two circles of spraying pipes 41, and at least two bottom waste water branch pipes 42 are connected to each circle of spraying pipes 41 at uniform intervals, each bottom waste water branch pipe 42 has two water outlets, and the two water outlets of each bottom waste water branch pipe 42 are connected to the two circles of spraying pipes 41 respectively, that is, the desulfurization waste water flows into both sides of each circle of spraying pipes 41, so that the spraying pressure at each position of each circle of spraying pipes 41 is more uniform. The furnace bottom spraying device is also provided with at least two compressed air branch pipes 43, and the air outlets of the at least two compressed air branch pipes 43 are communicated with the at least two bottom waste water branch pipes 42 respectively, and the communication positions are located between the bifurcation positions of the two water outlets of the bottom waste water branch pipe 42 and the adjusting valve 421. That is, the compressed air can be introduced into the at least two bottom waste water branch pipes 42 through the compressed air branch pipes 43 respectively to blow and unblock.

[0036] When the water inlet pump 21, the slurry pump 23, the waste water control master valve 24 and the adjusting valve 421 are opened, the desulfurization waste water is introduced from the water storage pool 151 into the waste water inlet main pipe 20, is concentrated to a water content of less than 45% through the concentration pretreatment device 152, is pumped into the bottom waste water branch pipe 42, enters the spraying pipe 41, is atomized into small water droplets by the spray head 411, is sprayed to the furnace bottom and the upper part of the ash bucket 14, contacts the ash and coking falling from the hearth 11, the water of the waste water is evaporated by the residual heat of the furnace bottom, the crystallization of the harmful sulfur-containing substances in the waste water is separated out, the crystallization is adsorbed and combined with the ash and coking falling from the hearth 11, and finally falls into the ash bucket 14 together to complete the treatment of the desulfurization waste water. When it is necessary to unblock the spraying pipe or the waste water pipe, the water inlet pump 21, the slurry pump 23, the waste water control master valve 24 and the adjusting valve 421 are closed to interrupt the water flow in the waste water pipe. The compressed air control valve 32 and the air compression device 31 are opened to make the compressed air enter the compressed air branch pipe 43 through the compressed air main pipe 30 to blow and unblock the desulfurization waste water branch pipe. The blowing time is preferably more than 5 minutes each time. Compared with the prior art, the boiler system of the utility model reduces the installation of the heat exchange device 16 and the atomization device 17, saves the equipment space, reduces the equipment energy consumption, and further reduces the operation and maintenance cost.

[0037] Further, the utility model finds that if the sprayed waste water is more, the temperature of the furnace bottom 12 is reduced too low to affect the evaporation of the water of the desulfurization waste water by the residual heat of the furnace bottom 12. In addition, when the ash in the boiler is more, if the amount of the sprayed waste water of the desulfurization waste water is small, the ash is not fully utilized for the treatment of the desulfurization waste water. Therefore, the utility model adds a detection device and a master control unit to the boiler system to facilitate the adjustment of the treatment of the desulfurization waste water according to the situation.

[0038] As Figure 4The total control unit is electrically connected with the total wastewater control valve 24, the adjusting valve 421, the compressed air control valve 32 and the detecting device. The total control unit is preferably a PID controller, which can receive and judge the detecting data from the detecting device, and control the opening and closing of the valves (i.e. the total wastewater control valve 24, the adjusting valve 421 and the compressed air control valve 32). The detecting device includes a conventional humidity meter, an ash detecting device and a coal type analyzing device. The humidity meter and the ash detecting device are arranged in the ash bucket 14, and the coal type analyzing device is arranged in the coal conveying passage and / or the coal feeder of the boiler. The humidity meter detects the humidity in the ash bucket, the ash detecting device detects the amount of ash collected by the ash bucket 14 in a unit time, and the coal type analyzing device detects the ash content of the coal in the coal conveying passage and / or the coal feeder. The humidity meter, the ash detecting device and the coal type analyzing device are electrically connected with the PID controller, and transmit the detecting data to the PID controller. When the ash detecting device detects that a large amount of ash is continuously collected by the ash bucket 14, or the coal type analyzing device detects that the ash content of the coal is greater than 25%, the PID controller judges that the boiler system is burning a high-ash coal, and a large amount of ash will be produced during the combustion of the boiler. Therefore, the opening degree of the adjusting valve 421 is increased by 10%-20% to increase the spraying amount of the desulfurization wastewater, and the large amount of falling ash is used to absorb the desulfurization wastewater crystals. When the humidity meter detects that the humidity in the ash bucket 14 is greater than 45%, the PID controller reduces the opening degree of the adjusting valve 421 and closes the total wastewater control valve 24 to stop the spraying, so as to avoid the incomplete treatment of the desulfurization wastewater. The skilled person can set the PID controller to judge the detecting data from the detecting device and automatically control the opening and closing of the valves to adjust the on-off and flow of the wastewater and the compressed air in the pipelines. Alternatively, the skilled person can manually judge the measuring data of the detecting device, manually control the PID controller to control the opening and closing of the valves, and then adjust the on-off and flow of the compressed air or the desulfurization wastewater in the pipelines. In addition, the conventional boiler system generally includes an energy management system, which can detect the load of the boiler and adjust the operation of the boiler to ensure the efficiency, safety and energy saving. The energy management system is a conventional device of the conventional boiler system. The skilled person can manually control the PID controller to control and adjust the valves according to the load of the boiler in the energy management system.

[0039] In addition, in addition to the fact that the desulfurization wastewater can be treated by using the residual heat and the ash residue at the furnace bottom, the present application also finds that the soot blower 19 used for removing the ash residue and the coking at the furnace 11 itself has the function of spraying high-temperature steam, and is an indispensable device in the normal use of the boiler. Therefore, the present application thinks that the desulfurization wastewater can also be introduced into the steam pipeline of the steam soot blower 19, and the desulfurization wastewater is heated by the high-temperature and high-pressure steam in the steam soot blower 19, and then is atomized together with the steam by the nozzle of the soot blower 19 and sprayed into the furnace 11. The heat of the furnace 11 evaporates the water in the desulfurization wastewater, and the precipitated crystals are contacted with the ash residue and coking knocked down by the soot blower 19 and are adsorbed, so that the treatment of the desulfurization wastewater is also completed. Since the desulfurization wastewater is heated by the steam and atomized by the soot blower 19, the heat exchange device 16 and the atomization device 17 do not need to be additionally installed, and the land occupation and the equipment operation and maintenance cost of the boiler system can also be reduced.

[0040] Therefore, the boiler system also comprises a furnace wastewater branch pipe 531. The water inlet of the furnace wastewater branch pipe 531 is connected with the wastewater inlet main pipe 20, and the connection position is located between the wastewater control main valve 24 and the water inlet of the furnace bottom wastewater branch pipe 42. The water outlet of the furnace wastewater branch pipe 531 is connected with the steam branch pipe 532, and the connection position is located between the soot blowing nozzle 533 and the steam control sub-valve 5321. The furnace wastewater branch pipe 531 is provided with a furnace wastewater control sub-valve 5311. The desulfurization wastewater after being concentrated and pretreated is introduced from the wastewater inlet main pipe 20 to the steam branch pipe 532 of the soot blower 19, and the desulfurization wastewater is combined with the steam in the steam branch pipe 532, and the desulfurization wastewater is heated by the steam in the combination process, and finally is atomized and sprayed into the furnace 11 of the boiler together with the steam by the soot blowing nozzle 533. At this time, the soot blower 19 can still blow off the ash residue and the coking on the inner wall of the furnace 11, and the desulfurization wastewater atomized and sprayed into the furnace 11 can be evaporated by the heat of the furnace 11, and the precipitated crystals are adsorbed by the ash residue and the coking on the inner wall and the coking blown off, and finally fall into the ash residue hopper 14 below.

[0041] Since the temperature of the steam is high, the temperature of the wastewater can be increased when the wastewater is combined with the steam, and a heating or heat exchange device 16 does not need to be additionally installed. Under the action of the soot blowing nozzle 533 and the high-pressure steam, the desulfurization wastewater can be directly atomized and sprayed into the furnace 11, and a atomization device 17 does not need to be additionally installed. The ash residue and the coking blown off by the soot blower 19 can be used again for the treatment of the desulfurization wastewater by the furnace bottom spraying device at the furnace bottom.

[0042] Further, an angle between the steam branch pipe 532 and the flue gas desulfurization wastewater branch pipe 531 is an acute angle at the communication position of the steam branch pipe 532 and the flue gas desulfurization wastewater branch pipe 531, that is, the angle between the flow direction of the flue gas desulfurization wastewater and the flow direction of the steam is an acute angle, so as to ensure the smooth combination of the flue gas desulfurization wastewater and the steam. The flue gas desulfurization wastewater branch pipe 531 is provided with a pressure reducing valve 5312 at a downstream position of the flue gas desulfurization wastewater control valve 5311. The pressure reducing valve 5312 reduces the pressure of the flue gas desulfurization wastewater in the flue gas desulfurization wastewater branch pipe 531 to a safe pressure, and controls the pressure of the flue gas desulfurization wastewater to be higher than the pressure of the steam, so as to further ensure that the flue gas desulfurization wastewater can smoothly enter the steam branch pipe 532 from the flue gas desulfurization wastewater branch pipe 531 to combine with the steam, and prevent the pipe from being blocked. Specifically, the pressure reducing valve 5312 can be a hydraulic valve or a pneumatic valve.

[0043] Further, as shown in Figure 5 the boiler system further comprises a communication pipe 54 which communicates the flue gas desulfurization wastewater branch pipe 531 and the steam branch pipe 532. The communication position of the communication pipe 54 and the flue gas desulfurization wastewater branch pipe 531 is between the outlet of the flue gas desulfurization wastewater branch pipe 531 and the pressure reducing valve 5312. The communication position of the communication pipe 54 and the steam branch pipe 532 is between the steam control valve 5321 on the steam branch pipe 532 and the outlet of the flue gas desulfurization wastewater branch pipe 531. The communication pipe 54 is provided with a check valve 541 at a position close to the flue gas desulfurization wastewater branch pipe 531, which is preferably a heavy hammer type check valve. The steam in the steam branch pipe can pass through the communication pipe 54 to enter the flue gas desulfurization wastewater branch pipe, and the flue gas desulfurization wastewater in the flue gas desulfurization wastewater branch pipe cannot pass through the communication pipe 54 to enter the steam branch pipe. The angle between the communication pipe 54 and the steam branch pipe 532 is an acute angle, that is, the angle between the steam flow direction in the communication pipe 54 and the steam flow direction in the steam branch pipe 532 is an acute angle, which is beneficial to the steam entering the communication pipe 54 from the steam branch pipe 532, and then being sprayed into the flue gas desulfurization wastewater branch pipe 531 from the upstream position of the outlet of the flue gas desulfurization wastewater branch pipe 531. When the flue gas desulfurization wastewater control valve 5311 and the steam control valve 521 and the steam control valve 5321 are all opened, that is, the flue gas desulfurization wastewater branch pipe 531 and the steam branch pipe 532 are communicated with the flue gas desulfurization wastewater and the steam respectively, the check valve 541 is in a closed state, and the steam cannot pass through the communication pipe 54 to enter the flue gas desulfurization wastewater branch pipe 531. When the flue gas desulfurization wastewater control valve 5311 and / or the flue gas desulfurization wastewater control valve 24 are closed, and the steam control valve 521 and the steam control valve 5321 are opened, the steam branch pipe 43 is communicated with the steam, and the flue gas desulfurization wastewater branch pipe 531 is not communicated with the flue gas desulfurization wastewater, so the check valve 541 is opened by the steam, the steam passes through the communication pipe 54 to be sprayed into the flue gas desulfurization wastewater branch pipe 531, and the sprayed steam plays a role of unblocking the flue gas desulfurization wastewater branch pipe 531. When the steam control valve 521 and / or the steam control valve 5321 are closed, and the steam branch pipe 43 is not communicated with the steam, that is, the soot blowing work is stopped, the check valve 541 is reset and returns to the closed state.

[0044] Further, as shown in Figure 4As shown, the steam control total valve 521, the steam control sub-valve 5321, the furnace waste water control sub-valve 5311, and the pressure reducing valve 5312 are electrically connected with the total control unit, the total control unit can control the opening and closing of the valves, and further control and adjust the on-off and flow of the steam and waste water.

[0045] Further, considering the high pressure in the pipes, in order to ensure the safety of the pipes, a gas safety valve is arranged between the steam control total valve 521 and the steam control sub-valve 5321, and between the air compression device 31 and the compressed air control valve 32 of the compressed air main pipe 30. The set pressure of the gas safety valve is set to be 0.5 MPa or more higher than the working pressure in the pipe, and preferably 0.5 MPa. When the pressure in the pipe is higher than the set pressure of the gas safety valve, the gas in the pipe is sprayed into the environment from the gas safety valve to release the pressure. Similarly, an overflow control valve is arranged between the waste water control total valve 24 and the adjusting valve 421, and between the waste water control total valve 24 and the furnace waste water control sub-valve 5311. The set pressure of the overflow control valve is set to be 0.5 MPa or more higher than the working pressure of the waste water in the pipe, and preferably 0.5 MPa. The water outlet of the overflow control valve is communicated with the desulfurization waste water storage tank 151 through an overflow circulation pipe. When the waste water pressure in the pipe is higher than the set pressure of the overflow control valve, the waste water in the pipe overflows from the overflow control valve and flows back to the storage tank 151 through the overflow circulation pipe.

[0046] Compared with the prior art, the boiler system provided by the utility model has the following advantages:

[0047] 1. The desulfurization waste water is atomized and dried for adsorption, so as to treat the desulfurization waste water. The device does not need to additionally install a heating and heat exchange device 16 and an atomization device 17, can effectively save the land occupation and energy consumption of the boiler system, and effectively reduces the cost.

[0048] 2. The relatively low-value ash and coking adsorb harmful sulfur-containing crystals in the waste water, so as to avoid spraying the waste water into the flue 13, and further avoid polluting the high-value fly ash in the flue 13.

[0049] 3. The multiple circle spray pipe 41 is arranged, so that the falling ash can fully contact with the desulfurization waste water for adsorption treatment.

[0050] 4. The detection device and the total control unit are arranged, so that the spray amount of the desulfurization waste water can be flexibly manually or automatically adjusted according to the operation of the boiler, and the treatment quality is ensured.

[0051] 5. The improved boiler itself must be necessary to the soot blower 19, will be introduced into the desulfurization wastewater to the soot blower 19, through the steam heating desulfurization wastewater and through the blowing nozzle 533 atomization spray into the furnace 11, using the furnace 11 of the waste heat and ash and coking for the treatment of desulfurization wastewater, also can reduce the installation and use of additional heat exchange device 16 and atomization device 17, save space, reduce energy consumption.

[0052] The terminology used in the present application embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application embodiments. As used in the description of the present application embodiments and the appended claims, the singular forms "a", "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or", as used in the description herein, signify all possible combinations of one or more of the associated listed items. The above description is related to the drawings, in which the same or similar elements are referred to with the same or similar reference numerals throughout the several figures. In the description of the present application, the specific meanings of the above terms can be understood according to the specific circumstances by those of ordinary skill in the art.

[0053] The above-described embodiments are merely representative of several embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as limiting the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of protection of the present application.

Claims

1. A boiler system, characterized in that, The system includes a boiler, an ash hopper, a wastewater inlet main, and a furnace bottom spray device. The middle part of the boiler is the furnace chamber, which serves as the combustion space. The part of the boiler located below the furnace chamber is the furnace bottom, and the bottom of the furnace bottom has an opening. The ash hopper is located below the furnace bottom of the boiler, and the opening of the ash hopper is connected to the opening of the furnace bottom. The desulfurization wastewater is led to the furnace bottom spray device through the wastewater inlet main, and then atomized by the furnace bottom spray device and sprayed onto the furnace bottom of the boiler and / or the upper part of the ash hopper.

2. The boiler system according to claim 1, characterized in that: The furnace bottom spray device includes a furnace bottom wastewater branch pipe and a spray pipe surrounding the inner wall of the furnace bottom and / or the inner wall of the upper part of the ash hopper; the furnace bottom wastewater branch pipe is connected to the wastewater inlet main pipe and the spray pipe respectively; the surface of the spray pipe is provided with a number of nozzles spaced apart and facing the furnace bottom or the central axis of the ash hopper; after the desulfurization wastewater enters the spray pipe, it is atomized by the nozzles and sprayed onto the furnace bottom and / or the upper part of the ash hopper of the boiler.

3. The boiler system according to claim 2, characterized in that: It also includes a compressed air main pipe through which compressed air is led to the furnace bottom spray device; the furnace bottom spray device also includes compressed air branch pipes, which are connected to the compressed air main pipe and the furnace bottom wastewater branch pipe respectively.

4. The boiler system according to claim 3, characterized in that: The furnace bottom spray device includes at least two rings of spray pipes; the furnace bottom wastewater branch pipe includes at least two outlets; each ring of spray pipe is connected to at least one outlet of the furnace bottom wastewater branch pipe.

5. The boiler system according to claim 4, characterized in that: The furnace bottom spray device includes at least one furnace bottom wastewater branch pipe and at least one compressed air branch pipe; each furnace bottom wastewater branch pipe is connected to at least one compressed air branch pipe.

6. The boiler system according to claim 3, characterized in that: The wastewater inlet main pipe is also equipped with a wastewater control main valve; the furnace bottom wastewater branch pipe is equipped with an adjustment valve, and when the furnace bottom wastewater branch pipe has at least two outlets, the adjustment valve is located upstream of the bifurcation position of the at least two outlets; the compressed air main pipe is equipped with a compressed air control valve; and a main control unit is also included, which is electrically connected to the wastewater control main valve, the adjustment valve, and the compressed air control valve respectively.

7. The boiler system according to claim 6, characterized in that: The boiler also includes a coal conveying channel and a coal feeder. The coal feeder is located outside the furnace. The coal conveying channel is connected to both the coal feeder and the furnace of the boiler. Coal is transported from the coal feeder to the furnace through the coal conveying channel. It also includes a detection device electrically connected to the main control unit; the detection device includes one or more of a hygrometer, an ash and slag detection device, and a coal type analysis device; wherein the hygrometer and the ash and slag detection device are installed in the ash and slag hopper, and the coal type analysis device is installed in the coal conveying channel and / or the coal feeder of the boiler.

8. The boiler system according to claim 7, characterized in that: It also includes a superheater, a steam main pipe connected to the superheater, a steam branch pipe connected to the steam main pipe, a soot blowing nozzle located at the steam outlet end of the steam branch pipe and extending into the furnace, and a furnace wastewater branch pipe; the furnace wastewater branch pipe is connected to the wastewater inlet main pipe downstream of the wastewater control main valve and the steam branch pipe upstream of the soot blowing nozzle; the desulfurization wastewater is led to the steam branch pipe through the furnace wastewater branch pipe, and the desulfurization wastewater merges with the steam introduced from the superheater by the steam main pipe in the steam branch pipe. After being heated by the steam in the steam branch pipe, the desulfurization wastewater is atomized by the soot blowing nozzle along with the steam and sprayed into the boiler furnace.

9. The boiler system according to claim 8, characterized in that: The main steam pipe is equipped with a main steam control valve; a branch steam control valve is installed on the steam branch pipe upstream of the confluence of steam and desulfurization wastewater; a branch furnace wastewater control valve and a pressure reducing valve are sequentially installed on the branch furnace wastewater pipe along the water flow direction; the main control unit is electrically connected to the main steam control valve, the branch steam control valve, the branch furnace wastewater control valve and the pressure reducing valve respectively.

10. The boiler system according to claim 9, characterized in that: At the connection point between the steam branch pipe and the furnace wastewater branch pipe, the angle formed by the steam branch pipe and the furnace wastewater branch pipe is an acute angle; it also includes a connecting pipe connecting the steam branch pipe and the furnace wastewater branch pipe, the connection point of the connecting pipe and the furnace wastewater branch pipe being located between the junction of desulfurization wastewater and steam and the pressure reducing valve; the connection point of the connecting pipe and the steam branch pipe being located between the steam control valve and the junction of desulfurization wastewater and steam; a check valve is provided on the connecting pipe so that the steam in the steam branch pipe can enter the furnace wastewater branch pipe through the connecting pipe, while the desulfurization wastewater in the furnace wastewater branch pipe cannot enter the steam branch pipe through the connecting pipe.

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