Integrated intelligent pollution discharge waste heat recovery device

Abstract

The utility model discloses an integrated intelligent blowdown waste heat recovery device, which relates to the technical field of waste heat recovery and utilization, and comprises a buffer tank, a blowdown heat exchanger and a control box, a sewage inlet of the device is provided with a three-way pipe and two manual valves, during operation, an operation valve is opened, and a service valve is closed; during maintenance, the maintenance valve is opened, and the operation valve is closed; sewage discharged by the steam boiler firstly enters the buffer tank, and the buffer tank is mainly used for stabilizing pressure, reducing impact and protecting the heat exchanger; then the sewage enters the sewage discharge heat exchanger for heat exchange, and the sewage is discharged after heat exchange is completed. Due to the fact that the resistance of the device is small, the sewage side does not need any power device, and normal sewage discharge can be achieved. The plate-type asymmetric efficient heat exchanger is selected as the sewage discharge heat exchanger, 316L stainless steel is adopted as a main body material, and the heat exchanger is high in efficiency, resistant to corrosion, large in sewage side channel, small in sewage resistance, not prone to blockage, free of influence on sewage discharge, free of a water pump on the sewage side, free of influence on boiler operation and free of safety risks.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery and utilization, and in particular to an integrated intelligent sewage waste heat recovery device. Background Art

[0002] During the operation of steam boilers, sewage discharge is required. The sewage discharge methods include fixed discharge and continuous discharge, etc., and a large amount of heat is taken away during the sewage discharge process. In large steam boiler systems, this heat may be slightly recovered; in small and medium-sized steam boiler systems, this heat is almost not recovered. The above situations cause a lot of heat waste and indirectly waste natural gas and other energy. Using the sewage waste heat recovery system to deeply recover the waste heat of steam boiler sewage or other sewage can not only turn waste into treasure, reduce the consumption of natural gas, steam and other energy, but also reduce carbon dioxide emissions.

[0003] During the operation of the steam boiler, the feed water entering the drum always contains a certain amount of salt, and the boiler water contains various soluble and insoluble impurities. Only a small part of these impurities are carried away by the steam, and most of them remain in the boiler water. As the boiler water continues to evaporate, the concentration of these impurities gradually increases. Excessive concentration of impurities in the boiler water not only affects the steam quality, but also causes scaling and corrosion of the heating surface, affecting the safe operation of the boiler. In order to control the quality of boiler water, it is necessary to discharge the boiler to discharge part of the boiler water contaminated by salt and water slag, and replenish it with clean water.

[0004] Steam boilers need to discharge wastewater during operation. The discharge rate of different steam boilers varies, ranging from about 3% to more than 20%. The temperature of the wastewater exceeds 100°C. During the discharge process, it becomes a steam-water mixture and takes away a lot of heat. Most of this heat is only shallowly recovered or even not recovered, resulting in energy waste. Utility Model Content

[0005] The purpose of the utility model is to provide an integrated intelligent sewage waste heat recovery device to solve the problems existing in the above-mentioned prior art. Through the integration of sewage heat exchangers and supporting components, deep recovery of steam boiler sewage waste heat can be achieved, the integration of the entire device can be realized, real-time monitoring and automatic control functions can be realized, and at the same time, simple and convenient on-site installation can be achieved.

[0006] To achieve the above purpose, the utility model provides the following solution: The utility model provides an integrated intelligent waste heat recovery device, including:

[0007] A buffer tank, wherein a sewage inlet is provided on the buffer tank, a tee pipe is provided at the sewage inlet, and the other two passages of the tee pipe are respectively connected to the maintenance pipeline and the sewage outlet of the steam boiler;

[0008] A sewage heat exchanger, wherein the outlet end of the buffer tank is connected to the sewage heat exchanger, and a sewage outlet is arranged at the end of the sewage heat exchanger; a heat exchange pipeline is arranged on the heat exchange side of the sewage heat exchanger, and the two ends of the heat exchange pipeline are respectively connected to a cold water pipe and a hot water pipe, and a water pump is arranged on the heat exchange pipeline;

[0009] A control box is provided with a touch screen and a controller, and the buffer tank and the sewage heat exchanger are both connected to the control box via electrical signals.

[0010] Preferably, an operating valve is provided at the sewage inlet of the buffer tank between the three-way pipe and the sewage inlet; an inspection valve is provided on the inspection pipeline; the integrated intelligent sewage waste heat recovery device has an operating valve that is opened and an inspection valve that is closed during operation; and an inspection valve that is opened and an operating valve that is closed during maintenance.

[0011] Preferably, temperature sensors are provided at the sewage inlet of the buffer tank and the sewage outlet of the sewage heat exchanger; and the temperature sensors are connected to the control box via hard-wired analog signals.

[0012] Preferably, a heat meter is arranged on the heat exchange pipeline, and the heat meter has two temperature sensors, which are respectively installed on the cold water pipe and the hot water pipe; the heat meter is connected to the control box through hard-wired communication.

[0013] Preferably, the cold water pipe is equipped with a water pump, the number of the water pumps is two, and the two water pumps are arranged in parallel, one for backup and the other for use; the temperature sensor on the cold water pipe is installed at the inlet of the water pump.

[0014] Preferably, the buffer tank, the blowdown heat exchanger and the control box are all integrated on an integrated bracket.

[0015] Compared with the prior art, the utility model has achieved the following beneficial technical effects:

[0016] The integrated intelligent waste heat recovery device for sewage treatment of the utility model includes a buffer tank, a sewage heat exchanger and a control box. A three-way pipe and two manual valves are arranged at the sewage inlet of the device. During operation, the operating valve is opened and the inspection valve is closed; during inspection, the inspection valve is opened and the operating valve is closed; during maintenance, the inspection valve is opened and the operating valve is closed; the sewage discharged from the steam boiler first enters the buffer tank, and the main function of the buffer tank is to stabilize the pressure, reduce the impact and protect the heat exchanger; then it enters the sewage heat exchanger for heat exchange, and the sewage is discharged after the heat exchange is completed. Since the resistance of this device is small, no power device is required on the sewage side to achieve normal sewage discharge. The sewage heat exchanger of the utility model selects a plate-type asymmetric high-efficiency heat exchanger, and the main material is 316L stainless steel. This type of heat exchanger has high efficiency and corrosion resistance, a large sewage side channel, low sewage resistance, and is not easy to block, which does not affect sewage discharge. No water pump is required on the sewage side, which does not affect the operation of the boiler and has no safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a simplified structural diagram of the integrated intelligent waste heat recovery device;

[0019] Figure 2 This is the control schematic diagram of the integrated intelligent waste heat recovery device;

[0020] Figure 3 It is an integrated diagram of the integrated intelligent waste heat recovery device;

[0021] Figure 4 This is the application diagram of the integrated intelligent waste heat recovery device;

[0022] Among them, 1. Maintenance valve; 2. Operation valve; 3. Buffer tank; 4. Sewage heat exchanger; 5. Hot water pipe; 6. Cold water pipe; 7. Water pump; 8. Temperature sensor; 9. Heat meter; 10. Control box; 11. Frequency converter; 12. Water tank; 13. Steam boiler. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The purpose of the utility model is to provide an integrated intelligent sewage waste heat recovery device to solve the problems existing in the above-mentioned prior art. Through the integration of sewage heat exchangers and supporting components, deep recovery of steam boiler sewage waste heat can be achieved, the integration of the entire device can be realized, real-time monitoring and automatic control functions can be realized, and at the same time, simple and convenient on-site installation can be achieved.

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 1-Figure 4 As shown, the utility model provides an integrated intelligent waste heat recovery device, comprising:

[0027] The buffer tank 3 is provided with a sewage inlet, a tee is provided at the sewage inlet, and the other two passages of the tee are respectively connected to the maintenance pipeline and the sewage outlet of the steam boiler 13;

[0028] The outlet end of the blowdown heat exchanger 4 and the buffer tank 3 are connected to the blowdown heat exchanger 4, and a blowdown outlet is arranged at the end of the blowdown heat exchanger 4; a heat exchange pipeline is arranged on the heat exchange side of the blowdown heat exchanger 4, and the two ends of the heat exchange pipeline are respectively connected to a cold water pipe 6 and a hot water pipe 5, and a water pump 7 is arranged on the heat exchange pipeline;

[0029] The control box 10 is provided with a touch screen and a controller, and the buffer tank 3 and the sewage heat exchanger 4 are both connected to the control box 10 via electrical signals.

[0030] Because the waste water discharged from the steam boiler 13 is a mixture of steam and water, the waste water heat exchanger 4 of the utility model selects a plate-type asymmetric high-efficiency heat exchanger, and the main material is 316L stainless steel. This type of heat exchanger has high efficiency and corrosion resistance, a large sewage side channel, low sewage resistance, and is not easy to block, does not affect sewage discharge, does not require a water pump on the sewage side, does not affect boiler operation, and has no safety risks.

[0031] The utility model provides an integrated intelligent sewage discharge waste heat recovery device, wherein a three-way pipe and two manual valves are arranged at the sewage inlet; during operation, the operating valve 2 is opened and the maintenance valve 1 is closed; during maintenance, the maintenance valve 1 is opened and the operating valve 2 is closed.

[0032] When the device is running, the sewage from the steam boiler 13 first enters the buffer tank 3, the main function of which is to stabilize the pressure, reduce the impact, and protect the heat exchanger; then it enters the sewage heat exchanger 4 for heat exchange, and the sewage is discharged after the heat exchange is completed. Since the resistance of this device is small, no power device is required on the sewage side to achieve normal sewage discharge.

[0033] The heating side of the sewage heat exchanger 4 is equipped with a variable frequency water pump to heat the liquid such as water that needs to be heated. Two water pumps 7 can be configured as needed, one for use and one for backup.

[0034] Temperature sensors 8 are arranged at the inlet of the buffer tank 3 and the sewage outlet of the sewage heat exchanger 4, and a water pump 7 and a heat meter 9 are arranged on the heating side of the sewage heat exchanger 4. The heat meter 9 has two temperature sensors 8 installed on the cold water pipe 6 and the hot water pipe 5 respectively, wherein the cold water pipe temperature sensor is installed on the inlet of the water pump 7.

[0035] Configure an intelligent control box, which is equipped with an IoT touch screen, a PLC (controller), an intelligent electric meter, and a frequency converter 11. The temperature sensor 8 at the sewage inlet and outlet is connected to the control box through a hard-wired analog signal; the heat meter 9 is connected to the control box through a hard-wired communication method; the main signals that can be monitored and controlled are shown in Table 1:

[0036] Table 1

[0037]

[0038]

[0039] The calculable data are shown in Table 2:

[0040] Table 2

[0041] Serial number Data name 1 Sewage temperature difference 2 Hot water temperature difference 3 Terminal difference (sewage outlet temperature - cold water temperature) 4 Operation heat to power ratio 5 The value (cost) of waste heat recovery 6 Electricity 7 Standard coal saving 8 <![CDATA[CO2 emission reduction]]>

[0042] The control mode of the integrated intelligent waste heat recovery device is as follows:

[0043] 1) Start-stop control

[0044] This device has automatic start and stop function. The specific logic is to set the "start temperature setting value" and "dead zone setting value" according to the project situation, then the "stop temperature setting value" = start temperature setting value - dead zone setting value; monitor the sewage outlet temperature, when the sewage outlet temperature exceeds the start temperature setting value, the device starts and the water pump runs; when the sewage outlet temperature is lower than the stop temperature setting value, the device stops and the water pump stops running.

[0045] 2) Dual pump switching

[0046] In the device equipped with two water pumps 7, the water pumps 7 are rotated regularly, and the standby pump is automatically switched when the water pump 7 fails.

[0047] 3) Terminal difference control mode

[0048] Terminal difference = sewage outlet temperature - cold water temperature. According to the terminal difference set value and actual value, the water pump operating frequency is controlled through the PID adjustment mode.

[0049] 4) Water outlet temperature control mode

[0050] In application scenarios where the hot water temperature needs to be controlled, the water pump operating frequency can be controlled through the PID adjustment mode according to the hot water outlet temperature set value and the actual hot water temperature value.

[0051] 5) Internet of Things and APP functions

[0052] The control box 10 is equipped with an IoT touch screen and a pass card to realize remote APP monitoring.

[0053] like Figure 3As shown, the integrated intelligent waste heat recovery device of the utility model is integrated. The whole device is integrated in the factory. It is an integrated intelligent waste heat recovery device for waste heat, a standard product, when it leaves the factory. Inspection valve 1, operation valve 2, buffer tank 3, waste heat exchanger 4, hot water pipe 5, cold water pipe 6, water pump 7, temperature sensor 8, heat meter 9 and control box 10 are all integrated on an integrated bracket, which is convenient for on-site installation. You only need to connect the power supply and 5 water pipes. The water pipe interface is generally a standard flange interface; the 5 water inlets are sewage inlet, sewage outlet, inspection sewage outlet, cold water inlet and hot water inlet.

[0054] like Figure 4 As shown, this is a relatively common application method of the utility model, which takes water from the softened water tank 12 of the steam boiler 13, recovers the waste heat of sewage through the integrated intelligent waste heat recovery device, and heats the softened water, thereby increasing the boiler feed water temperature, reducing the natural gas consumption of the steam boiler 13, and achieving energy saving.

[0055] In addition, the utility model can be applied not only to waste heat recovery from gas-fired steam boilers, but also to waste heat recovery from steam boilers using other fuels. It can also be used to recover waste heat from sewage in other scenarios.

[0056] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0057] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. Integrated intelligent waste heat recovery device, characterized by: include: A buffer tank, wherein a sewage inlet is provided on the buffer tank, a tee is provided at the sewage inlet, and the other two passages of the tee are respectively connected to the maintenance pipeline and the sewage outlet of the steam boiler; A sewage heat exchanger, wherein the outlet end of the buffer tank is connected to the sewage heat exchanger, and a sewage outlet is arranged at the end of the sewage heat exchanger; a heat exchange pipeline is arranged on the heat exchange side of the sewage heat exchanger, and the two ends of the heat exchange pipeline are respectively connected to a cold water pipe and a hot water pipe, and a water pump is arranged on the heat exchange pipeline; A control box is provided with a touch screen and a controller, and the buffer tank and the sewage heat exchanger are both connected to the control box via electrical signals.

2. The integrated intelligent waste heat recovery device according to claim 1 is characterized in that: An operating valve is provided at the sewage inlet of the buffer tank between the three-way pipe and the sewage inlet; an inspection valve is provided on the inspection pipeline; the integrated intelligent sewage waste heat recovery device has an operating valve that opens and an inspection valve that closes during operation; the inspection valve opens and the operating valve closes during maintenance.

3. The integrated intelligent waste heat recovery device according to claim 1 is characterized in that: Temperature sensors are provided at the sewage inlet of the buffer tank and the sewage outlet of the sewage heat exchanger; the temperature sensors are connected to the control box through hard-wired analog signals.

4. The integrated intelligent waste heat recovery device according to claim 1 is characterized in that: The heat exchange pipeline is provided with a heat meter, which is provided with two temperature sensors, and the two temperature sensors are respectively installed on the cold water pipe and the hot water pipe; the heat meter is connected to the control box through hard wiring communication.

5. The integrated intelligent waste heat recovery device according to claim 4 is characterized in that: The cold water pipe is equipped with a water pump, the number of which is two, which are arranged in parallel, one for backup and the other for use; the temperature sensor on the cold water pipe is installed at the inlet of the water pump.

6. The integrated intelligent waste heat recovery device according to claim 1 is characterized in that: The buffer tank, the blowdown heat exchanger and the control box are all integrated on an integrated bracket.

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