CN207893738U - A kind of effluent from boiler residual neat recovering system - Google Patents

Abstract

A kind of effluent from boiler residual neat recovering system of the utility model offer is disposed with boiler, sewage storage tank, sewage water heat pump, sewage gasifying pot, high pressure roots wind turbine, heat exchanger and steam-water separator on high temperature sewage and atomization gas flow direction：It is provided with gas outlet at the top of gasifying pot, gasifying pot internal upper part is rotatably connected to the centrifugal atomizing sieve bucket being vertically arranged, it is fixed with the centrifugal turbine being positioned above in centrifugal atomizing sieve bucket shaft, in gasifying pot one or more sewage ejectors are circumferentially with around centrifugal atomizing sieve bucket, sewage ejector has sewage inlet and jet port, after the sewage pumped out from sewage water heat pump flows into sewage inlet, centrifugal atomizing sieve bucket is sprayed to from sewage jet port and is atomized, push centrifugal atomizing sieve bucket and centrifugal turbine rotation, atomization gas flows to high pressure roots wind turbine from gas outlet, heat exchanger heats softened water.The utility model has fully recycled sewage heat energy and can make equipment longtime running.

Description

A Boiler Sewage Waste Heat Recovery System

technical field

The utility model belongs to the technical field of boiler sewage treatment, in particular to a waste heat recovery system for boiler sewage.

Background technique

Since my country's per capita exploitable energy resources are less than the world's average level, the resources are relatively tight, and coal is still the mainstay. When generating heat, coal is used in large quantities, causing serious air pollution and frequent smog, which poses serious health risks to the general public. Negative impact. On the one hand, our country spends a huge amount of foreign exchange every year to purchase a large amount of oil and natural gas energy, and on the other hand, in the process of using energy, it has not realized full gradient utilization.

Since heat exchangers are placed in hot sewage, they are easily corroded and scaled, and are difficult to maintain. Therefore, many enterprises do not have recovery systems for waste heat sewage in their boiler sewage systems, and do not utilize the heat energy of sewage, which not only causes a lot of energy waste , also polluted the environment.

To sum up, a stable and efficient sewage heat energy recovery system is needed to solve the waste problem of waste water containing waste heat from existing boilers.

Utility model content

The purpose of this utility model is to provide a waste heat recovery system for boiler sewage, which uses air as a working medium to exchange energy through the aeration of hot sewage and the centrifugal atomization area, and then conduct energy exchange with industrial raw water or soft water through a heat exchanger. Energy exchange and recirculation to the aeration circuit fully recycles and utilizes the heat energy of the sewage, which is beneficial to the long-term operation of the equipment.

The utility model adopts the following technical scheme: a waste heat recovery system for boiler sewage, which is characterized in that it includes a boiler and a softened water tank, and in the flow direction of high-temperature sewage and atomized gas, a boiler, a sewage storage tank, a sewage heat pump, Sewage vaporization tank, high pressure Roots blower, heat exchanger and steam separator:

The top of the sewage vaporization tank is provided with an air outlet connected to the high-pressure Roots blower, and the inner upper part of the sewage vaporization tank is rotatably connected with a centrifugal atomization screen barrel arranged in the vertical direction, and the rotating shaft of the centrifugal atomization screen barrel A centrifugal turbine located above the centrifugal atomizing sieve barrel is fixed on the top, and one or more sewage injectors are arranged around the circumference of the centrifugal atomizing sieve barrel in the sewage vaporization tank, and the sewage injector has a sewage water inlet and a sewage injection port. After the sewage pumped by the heat pump flows into the sewage water inlet, it is sprayed from the sewage injection port to the centrifugal atomization screen barrel and atomized, driving the centrifugal atomization screen barrel and the centrifugal turbine to rotate, and the atomized gas flows from the air outlet to the high-pressure Roots blower And flow into the heat exchanger to heat the demineralized water. The upper part of the centrifugal atomization sieve bucket is also provided with a negative pressure sensor for detecting the negative pressure on the upper part of the sewage vaporization tank, and the lower part of the sewage vaporization tank is also provided with a liquid level temperature sensor;

The heat exchanger is located in the softened water tank, the lower part of the steam-water separator communicates with the softened water tank, and the lower water outlet of the softened water tank communicates with the water inlet of the boiler.

The lower part of the sewage vaporization tank is provided with an air supply aeration pipe and a return air aeration pipe. The air pipe is connected to the gas return pipeline, and the other end of the gas return pipeline is connected to the steam-water separator. According to the flow direction of the gas, a pressure sensor, a pressure control valve and a pressure regulating valve are sequentially arranged on the gas return pipeline.

The sewage injector is installed on the tank wall of the sewage vaporization tank.

The top of the sewage vaporization tank is fixed with a rotating shaft extending downward, and the centrifugal turbine and the centrifugal atomizing screen bucket are respectively installed at different heights of the rotating shaft, so that the centrifugal turbine and the centrifugal atomizing screen bucket are fixed in the sewage vaporization tank.

The opening of the pressure control valve is controlled by the control system through PID adjustment according to the feedback value of the pressure sensor and the system set pressure value.

The opening of the return air pipe pressure regulating valve is controlled by the control system through PID adjustment according to the pressure feedback value of the negative pressure sensor in the hot sewage vaporization tank and the system set pressure value.

The bottom of the sewage vaporization tank is provided with a sewage drain pipe and a sewage electric valve.

The operation of the sewage heat pump and the opening and closing of the sewage electric valve are controlled by the liquid level temperature sensor.

The water quality softening fixed bed is connected with the softening water tank, and the water softened by the water quality softening fixed bed enters into the softening water tank through the softening water supply pipe, and the softening water supply pipe is provided with a softening water electric valve.

The heated demineralized water in the demineralized water tank enters the boiler through the boiler demineralized water supply pipe, and the boiler demineralized water supply pipe is provided with a boiler demineralized water pump.

The beneficial effects of the utility model:

1) The heat recovery system for energy-saving and emission-reducing sewage with waste heat uses air as a working medium to exchange energy through the aeration and centrifugal atomization zone of hot sewage first, and then exchange energy with industrial raw water or soft water through a heat exchanger , recirculated to the aeration circuit, the working medium air is in direct contact with the hot sewage for heat energy exchange, compared with the traditional way of heat exchange through pipelines, there is no heat exchange pipeline in the hot sewage, so there is no traditional Scaling and corrosion of heat exchange pipelines reduces equipment maintenance costs and improves equipment efficiency and effective operation rate of equipment;

2) The waste heat recovery system of air working medium sewage meets the environmental protection requirements of energy saving, consumption reduction, practicality and high efficiency. While making full use of the heat energy of sewage and condensed water, it also reduces the thermal pollution of the heated sewage to the environment.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the structural representation of the utility model.

Detailed ways

In order to make the technical purpose, technical solution and beneficial effect of the utility model clearer, the technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the waste heat recovery system for boiler sewage of the utility model includes a boiler 1 and a softened water tank 7. In the flow direction of high-temperature sewage and atomized gas, a boiler 1, a sewage storage tank 2, a sewage heat pump 3, Sewage vaporization tank 4, high-pressure Roots blower 5, heat exchanger 6 and steam-water separator 8:

The inner upper part of the sewage vaporization tank 4 is rotatably connected with a centrifugal atomization screen bucket 9 arranged in the vertical direction. A centrifugal turbine 10 is fixed on the rotating shaft of the bucket 9, and the centrifugal turbine 10 is located above the centrifugal atomizing screen bucket 9. In the sewage vaporization tank 4, a sewage injector 11 is arranged on the periphery of the centrifugal atomizing screen bucket 9, and the sewage There is a certain distance between the injector 11 and the centrifugal atomizing screen bucket 9. According to the needs of the sewage water output or water outlet pressure, one sewage injector can be installed around the circumference of the centrifugal atomizing screen bucket 9, and multiple sewage injectors can also be provided. Sewage ejector.

The sewage injector 11 has a sewage water inlet and a sewage injection port, and the sewage injection port is arranged on one side of the centrifugal atomizing sieve barrel 9, and the sewage pumped from the sewage heat pump 3 flows into the sewage water inlet of the sewage injector 11, thereby Spray obliquely from the sewage injector 11 to the centrifugal atomizing sieve barrel 9 . In this embodiment, the sewage injector 11 has two sewage water inlets, the upper and the lower, respectively, but the utility model is not limited thereto, and the number of sewage water inlets is not limited according to the needs of the sewage water output or water outlet pressure.

The hot sewage is transported to the sewage injector 11 by the sewage heat pump 3, and the sprayed sewage column forms a certain angle with the cylindrical centrifugal atomization screen bucket 9, thereby driving the centrifugal atomization screen bucket 9 to rotate at a high speed, and the centrifugal atomization screen bucket 9 The high-speed rotation drives the rotating shaft 18 to rotate, thereby driving the centrifugal turbine 10 to rotate, and the hot sewage column is cut, crushed and thrown out by the centrifugal atomizing sieve bucket 9, generating a large amount of hot steam. When the centrifugal turbine 10 rotates at a high speed, the steam generated in the hot sewage vaporization tank 4 is pushed up.

The top of the sewage vaporization tank 4 is provided with an air outlet 12 communicating with the high-pressure Roots blower 5, and the upper part of the centrifugal atomization sieve bucket 9 is also provided with a negative pressure sensor 13 for detecting the negative pressure on the top of the sewage vaporization tank 4, The bottom of the sewage vaporization tank 4 is also provided with a liquid level temperature sensor 14 .

The air outlet 12 on the upper part of the hot sewage vaporization tank 4 is connected to the high-pressure Roots blower 5 through a pipeline. When the high-pressure Roots blower 5 is in operation, a certain negative pressure is formed in the upper part of the hot sewage vaporization tank 4 under control, which strengthens the flow of hot sewage. The vaporization and output of hot steam. In this embodiment, there are two gas outlets 12, which are arranged symmetrically on both sides of the top of the hot sewage vaporization tank 4, and the two gas outlets are respectively connected with low-pressure steam pipelines and connected with high-pressure Roots blowers 5 respectively.

The heat exchanger 6 is located in the softened water tank 7 , the lower part of the steam-water separator 8 communicates with the softened water tank 7 , and the lower water outlet of the softened water tank 7 communicates with the water inlet of the boiler 1 .

The lower part of the sewage vaporization tank 4 is provided with aeration aeration pipe 15 and return aeration aeration pipe 16. The gas electric valve 60, the return air aeration pipe 16 is connected with the return air pipeline 51, and the other end of the return air pipeline 51 is connected with the steam-water separator 8. According to the gas flow direction, the return air pipeline 51 is sequentially provided with pressure sensors 17. Pressure control valve 61 and pressure regulating valve 62.

In the flow direction of the atomized gas, under the joint action of the high-pressure Roots blower 5 and the steam pipeline pressure control valve 61, a certain positive pressure is formed at the downstream end of the high-pressure Roots blower 5, and the high-pressure Roots blower 5 The steam and air mixture extracted from the upstream end is compressed and then sent to the heat exchanger 6 for energy exchange. The condensed water generated after the energy exchange is recycled to the softened water tank 7, and the remaining hot gas is sent to the return air aeration pipe 16 under control. Recycle.

The sewage particles after centrifugal atomization fall into the lower part of the hot sewage vaporization tank 4 for storage, and are aerated by the return air aeration pipe 16 and the aeration aeration pipe 15 in the sewage, and the air bubbles generated by the aeration pass through the hot sewage In the process of breaking its surface, a large amount of hot steam is generated.

The sewage injector 11 is installed on the tank wall of the sewage vaporization tank 4, and the sewage injector 11 is arranged symmetrically on both sides of the centrifugal atomization sieve bucket 9. Both sides of the sieve bucket 9 are arranged symmetrically, so that the sewage sprayed out by the sewage injector 11 generates a uniform thrust on the centrifugal atomization sieve bucket 9, thereby promoting the centrifugal atomization sieve bucket 9 to rotate smoothly.

The top of the sewage vaporization tank 4 is fixed with a rotating shaft 18 extending downward, and the centrifugal turbine 10 and the centrifugal atomizing screen bucket 9 are installed at different height positions of the rotating shaft 18, so that the centrifugal turbine 10 and the centrifugal The atomizing screen barrel 9 is fixed in the sewage vaporization tank 4, the centrifugal atomizing device 9 and the centrifugal turbine 10 steam lifting device are arranged concentrically and coaxially, and the sewage sprayed by the sewage injector 11 pushes the centrifugal atomizing screen barrel 9 to rotate smoothly. At the same time, the centrifugal turbine 10 is driven to rotate accordingly.

The bottom of the sewage vaporization tank 4 is provided with a sewage drain pipe 52 and a sewage electric valve 63 .

Connected with the softening water tank 7, there is a water quality softening fixed bed 19, and the water softened by the water quality softening fixed bed 19 enters into the softening water tank 7 through the softening water supply pipe 53, and the softening water supply pipe 53 is provided with a softening water electric valve 64. When the water level in the softened water tank 7 was low, the softened water electric valve 64 was opened, and the water softened by the water softening fixed bed 19 flowed into the softened water tank 7 .

The heated demineralized water in the demineralized water tank 7 enters the boiler 1 through the boiler demineralized water supply pipe 54 , and the boiler demineralized water supply pipe 54 is provided with a boiler demineralized water pump 20 . When the boiler needs to replenish demineralized water, the boiler demineralized water pump 20 starts to transport the water heated by the heat exchanger 6 in the demineralized water tank 7 to the boiler 1 .

The sewage particles after centrifugal atomization fall into the lower part of the hot sewage vaporization tank 4 for storage. The feedback value and system setting value are realized through the control of the high-pressure sewage heat pump 3 and the sewage electric valve 63 .

Specifically, the liquid level temperature sensor 14 can detect the liquid level and temperature of the sewage in the lower part of the hot sewage vaporization tank 4. When the system detects that the water level in the hot sewage vaporization tank 4 is higher than the system set water level through the liquid level temperature sensor 14, The system will control the high-pressure sewage heat pump 3 to slow down and stop; if the water level is lower than the system set water level and continues to reach the time period set by the system, the system will control the high-pressure sewage heat pump 3 to start and speed up; when the liquid level temperature sensor 14 detects When the temperature of the sewage is lower than the set value of the system, the sewage electric valve 63 is opened, and the low-temperature sewage is discharged through the sewage discharge pipe 52 .

The upstream part of the return gas pipeline 51, that is, the pipeline part from the steam-water separator 8 to the pressure control valve 61, controls the switch of the pressure control valve 61 to compress the steam in the pipeline. The opening of the pressure control valve 61 is controlled by the control system through PID regulation according to the feedback value of the pressure sensor 17 and the system set pressure value.

The opening degree of the air return pipe pressure regulating valve 62 is adjusted and controlled by the control system according to the pressure feedback value of the negative pressure sensor 13 in the hot sewage vaporization tank 4 and the system set pressure value. That is, the aeration rate through the return air aeration pipe 51 is controlled, the aeration amount of the return air aeration pipe 51 is controlled, and the negative pressure value of the upper half space of the hot sewage vaporization tank 4 is also controlled. In this way, the negative pressure value of the upper space in the hot sewage vaporization tank 4 is also well controlled while the recycled hot residual air is fully utilized.

When working, the hot sewage discharged from the boiler 1 is transported to the hot sewage storage insulation tank 2, and then the hot sewage is transported to the centrifugal atomizing spray in the upper half of the hot sewage vaporization tank 4 through the high-pressure sewage heat pump 3 and the high-temperature sewage delivery pipe. The spraying device carries out steam atomization, the lighter hot steam rises and is suspended in the space above the hot sewage vaporization tank 4, and the larger sewage particles fall into the lower half of the hot sewage vaporization tank 4 for storage.

The lower part of the heated sewage stored in the lower part of the hot sewage vaporization tank 4 has a return air aeration pipe 16 and an air supplement aeration pipe 15, and the return air aeration pipe 16 performs continuous aeration; when the space at the top of the hot sewage vaporization tank 4 When the negative pressure is greater than the set value and continues to exceed the time period set by the system, the aeration aeration pipe 15 performs supplementary aeration, and the air sucked by the negative pressure enters through the aeration pipeline 50 and the aeration aeration pipe 15 In the hot sewage vaporization tank 4, the negative pressure in the upper half of the hot sewage vaporization tank 4 is reduced; the air bubbles produced by the aeration float up to the surface of the hot sewage and burst to generate a large amount of steam.

When the centrifugal turbine 10 rotates at a high speed, the steam generated in the hot sewage vaporization tank 4 is pushed up.

There is a low-pressure steam pipeline between the top of the hot sewage vaporization tank 4 and the high-pressure Roots blower 5, and a high-pressure steam pipeline between the high-pressure Roots blower 5 and the heat exchanger 6. When the high-pressure Roots blower 5 is running, the hot sewage is extracted At the same time as the mixed gas of steam and air in the vaporization tank 4, a certain negative pressure zone is formed in the upper half of the hot sewage vaporization tank 4, which strengthens the vaporization and output of the hot sewage.

When the high-pressure Roots blower 5 is running, the mixed gas of steam and air enters the heat exchanger 6, and the heat exchanger 6 is in the cold water of the demineralized water cooling water tank 7, and the water vapor whose pressure is increased is exchanged with the demineralized cold water at the heat exchanger 6. sufficient energy exchange.

After the high-temperature and high-pressure water vapor and air complete the heat energy exchange in the heat exchanger 6, the condensed water and hot residual air generated are pressed into the steam-water separator 8, and the separated condensed water flows into the softened water cooling water tank 7 for recycling, and the hot residual air passes through The return air compression pipeline downstream of the steam-water separator 8 is controlled by the pressure control valve 61 and enters the return air pipe 51. After the pressure is adjusted by the return air pipe pressure regulating valve 62, it is transported to the return air aeration pipe 16 for aeration, realizing Heat energy recycling.

The energy recovery system of the utility model for energy-saving and emission-reducing sewage with waste heat uses air as a working medium, so that it can first exchange energy through the aeration of hot sewage and the centrifugal atomization area, and then exchange energy with industrial raw water or soft water through a heat exchanger. , recirculated to the aeration circuit, the working medium air is in direct contact with the hot sewage for heat energy exchange, compared with the traditional way of heat exchange through pipelines, there is no heat exchange pipeline in the hot sewage, so there is no traditional The fouling and corrosion phenomenon of the heat exchange pipeline reduces the equipment maintenance cost, improves the equipment efficiency and the effective operation rate of the equipment.

The utility model air working medium waste heat recovery system meets the requirements of energy saving, consumption reduction, practicality and high efficiency and environmental protection. While making full use of the heat energy of sewage and condensed water, it also reduces the heat pollution caused by hot sewage to the environment.

Finally, it should be noted that: the above-mentioned embodiments are only used to illustrate and not limit the technical solutions of the present utility model, any equivalent replacement of the present utility model and any modification or partial replacement that does not depart from the spirit and scope of the present utility model shall be Covered within the protection scope of the claims of the present utility model.

Claims (10)

1. A waste heat recovery system for boiler sewage, characterized in that it comprises a boiler and a softened water tank, and in the flow direction of high-temperature sewage and atomized gas, a boiler, a sewage storage tank, a sewage heat pump, a sewage vaporization tank, and a high-pressure cylinder are arranged in sequence. Ci fan, heat exchanger and steam separator: The top of the sewage vaporization tank is provided with an air outlet connected to the high-pressure Roots blower, and the inner upper part of the sewage vaporization tank is rotatably connected with a centrifugal atomization screen barrel arranged in the vertical direction, and the rotating shaft of the centrifugal atomization screen barrel A centrifugal turbine located above the centrifugal atomizing sieve barrel is fixed on the top, and one or more sewage injectors are arranged around the circumference of the centrifugal atomizing sieve barrel in the sewage vaporization tank, and the sewage injector has a sewage water inlet and a sewage injection port. After the sewage pumped by the heat pump flows into the sewage water inlet, it is sprayed from the sewage injection port to the centrifugal atomization screen barrel and atomized, driving the centrifugal atomization screen barrel and the centrifugal turbine to rotate, and the atomized gas flows from the air outlet to the high-pressure Roots blower And flow into the heat exchanger to heat the demineralized water. The upper part of the centrifugal atomization sieve bucket is also provided with a negative pressure sensor for detecting the negative pressure on the upper part of the sewage vaporization tank, and the lower part of the sewage vaporization tank is also provided with a liquid level temperature sensor; The heat exchanger is located in the softened water tank, the lower part of the steam-water separator communicates with the softened water tank, and the lower water outlet of the softened water tank communicates with the water inlet of the boiler. 2. A boiler sewage waste heat recovery system according to claim 1, characterized in that, the bottom of the sewage vaporization tank is provided with an air supply aeration pipe and a return air aeration pipe, and the air supply aeration pipe is connected with the atmosphere It is connected with the connected gas supply pipeline, and the gas supply electric valve is set on the gas supply pipeline. A pressure sensor, a pressure control valve and a pressure regulating valve are sequentially arranged on the gas pipeline. 3. A waste heat recovery system for boiler sewage according to claim 2, wherein the sewage injector is installed on the tank wall of the sewage vaporization tank. 4. A waste heat recovery system for boiler sewage according to claim 3, characterized in that, the top of the sewage vaporization tank is fixed with a rotating shaft extending downward, and the centrifugal turbine and the centrifugal atomizing screen barrel are respectively installed in the Different height positions of the rotating shaft, so that the centrifugal turbine and the centrifugal atomizing sieve barrel are fixed in the sewage vaporization tank. 5. A waste heat recovery system for boiler sewage according to claim 4, characterized in that the opening of the pressure control valve is controlled by the control system through PID adjustment according to the feedback value of the pressure sensor and the system set pressure value. 6. A boiler sewage waste heat recovery system according to claim 5, characterized in that the opening of the return air pipe pressure regulating valve is set by the control system according to the pressure feedback value of the negative pressure sensor in the hot sewage vaporization tank and the system The pressure value is controlled by PID regulation. 7. A waste heat recovery system for boiler sewage according to claim 6, characterized in that, the bottom of the sewage vaporization tank is provided with a sewage drain pipe and a sewage electric valve. 8. A waste heat recovery system for boiler sewage according to claim 7, characterized in that the operation of the sewage heat pump and the opening and closing of the sewage electric valve are controlled by a liquid level temperature sensor. 9. A waste heat recovery system for boiler sewage according to claim 8, characterized in that there is a water softening fixed bed connected to the softened water tank, and the water softened by the water softening fixed bed flows into the softened water tank through the softened water supply pipe , The softened water supply pipe is provided with a softened water electric valve. 10. A waste heat recovery system for boiler sewage according to claim 9, wherein the heated softened water in the softened water tank enters the boiler through the boiler softened water pipe, and the boiler softened water pipe is provided with a boiler soft water pump.