Non-stop frostless dual-power self-adjusting steam generator

Abstract

The invention discloses a non-stop frostless dual-power self-adjusting steam generator, which belongs to the technical field of steam generators and comprises a controller for controlling a whole machine, a power grid system for acquiring electricity price cost in real time and a fuel gas system for acquiring fuel gas price change in real time, the controller is in communication connection with a power grid system and a gas system through a wireless network; the system further comprises a primary heat pump circulating system and a secondary gas system. The first-stage heat pump circulating system and the second-stage fuel gas system are respectively connected into the power grid system and the fuel gas system; according to the non-stop frost-free dual-power self-adjusting steam generator, automatic switching of an electricity-fuel gas mixed use mode or a full fuel gas mode is achieved, the production cost is reduced, flue gas heat can be recycled and used for defrosting of an air side heat exchanger, non-stop defrosting is achieved, and the energy-saving effect can be achieved to the maximum extent.

Description

Technical Field

[0001] The invention relates to a non-stop and frost-free dual-power self-regulating steam generator, belonging to the technical field of steam generators. Background Art

[0002] Air source heat pumps can extract heat from the air, but it is difficult to obtain hot water at a higher temperature by traditional methods. Generally, water can only be heated to no more than 60°C. At the same time, in winter, the bottom of the evaporator has less airflow and the evaporation temperature is low, which is prone to frost. Current defrosting methods such as electric defrosting and hydraulic defrosting require more energy to defrost. Natural defrosting and reverse cycle defrosting will cause the unit to shut down or run in reverse, affecting indoor heating and preventing normal hot water production.

[0003] Gas boilers heat water through gas, thus heating cold water into hot water or steam. However, due to factors such as the coal-to-gas conversion in the north in recent years, there is a shortage of gas in winter, gas outages and other phenomena occur frequently, and the price of gas rises sharply in winter, which greatly increases the unit energy consumption cost. In addition, the current electricity price has a large gap between peak and valley prices. When the peak electricity price is higher than the gas price, if it cannot be adjusted in the first place, it may lead to additional expenses.

[0004] Therefore, in order to solve the above problems, it is urgent to propose a non-stop and frost-free dual-power self-regulating steam generator. Summary of the invention

[0005] To solve the above problems, the present invention proposes a non-stop and frost-free dual-power self-regulating steam generator, which can realize automatic switching between electricity-gas mixed mode or full gas mode, reduce production costs, and can recover flue gas heat for defrosting of the wind-side heat exchanger, thereby realizing non-stop defrosting and maximizing energy saving.

[0006] The non-stop and frost-free dual-power self-regulating steam generator of the present invention has two heating stages. The first stage uses a heat pump to heat to a certain temperature, and the second stage uses gas to heat to the steam stage. First, the real-time electricity price, outdoor temperature changes, and gas price changes are read through the Internet to determine whether the electricity cost during this period is greater than the gas cost. If it is greater, full two-stage heating is adopted, and if it is less, first-stage / second-stage segmented heating is adopted, so as to realize electronic automatic control to switch between the electric-gas mixed mode or the full gas mode. It includes a controller for whole machine control, a power grid system for obtaining electricity prices in real time, and a gas system for obtaining gas price changes in real time. The controller is connected to the power grid system and the gas system through a wireless network. It also includes a first-stage heat pump circulation system and a second-stage gas system. The first-stage heat pump circulation system and the second-stage gas system are connected to the power grid system and the gas system respectively.

[0007] The primary heat pump circulation system includes a compressor, an air-side heat exchanger, an economizer and a condenser; the compressor is connected to the air-side heat exchanger and the condenser respectively through a four-way valve; the liquid inlet of the condenser is connected to a cold water inlet line; the compressor is connected to the economizer through a reflux pipeline; the condenser is connected to the air-side heat exchanger through a one-way valve; the economizer is connected to the one-way valve through a throttle valve, and an expansion valve is also connected between the economizer and the one-way valve; wherein, the primary heat pump circulation system is similar to the air-source heat pump in the prior art in its working principle;

[0008] The secondary gas system includes a spray gas evaporator, a spray water circulation pump, a flue gas waste heat recovery water tank and a defrost water pump; the spray gas evaporator is connected to the condenser through a hot water pipeline; the bottom of the spray gas evaporator is connected to the spray water circulation pump through a circulation pipeline, and the other end of the spray water circulation pump is connected to the hot water pipeline; the spray gas evaporator is connected to the flue gas waste heat recovery water tank through a smoke exhaust pipeline; the flue gas waste heat recovery water tank is connected to the wind side heat exchanger through a defrost water pump.

[0009] Furthermore, the spray-type gas evaporator includes a gas furnace chamber; a steam outlet is provided at the top of the gas furnace chamber; a spray circulation outlet is provided at the bottom of the gas furnace chamber; the spray circulation outlet is connected to the circulation pipeline; a gas inlet is provided at the bottom of the side of the gas furnace chamber; a water inlet is provided on the side of the gas furnace chamber, above the gas inlet; the water inlet is connected to the hot water pipeline; a nozzle is installed at the water inlet; a flue gas duct is provided inside the gas furnace chamber, and the flue gas duct extends from the side of the gas furnace chamber away from the water inlet to the outside, and the flue gas duct is connected to the smoke exhaust pipeline.

[0010] Furthermore, tap water is connected to the water inlet through a valve. When the electricity fee is higher than the gas fee, the full gas mode is adopted, and the tap water is directly connected to the spray gas evaporator.

[0011] As a preferred embodiment, the air-side heat exchanger is provided with a defrost pipe and a refrigerant liquid pipe arranged in a spiral shape from top to bottom, and the defrost pipe and the refrigerant liquid pipe are arranged alternately.

[0012] Furthermore, the four-way valve is provided with first to fourth connecting pipes, and the first to fourth connecting pipes are respectively connected to the exhaust port of the compressor, the heat exchange outlet of the air side heat exchanger, the return air pipe of the compressor and the medium inlet of the condenser.

[0013] Furthermore, a first temperature sensor is installed on the surface of the wind-side heat exchanger; the first temperature sensor is communicated with the defrost water pump through the controller, and the surface temperature of the wind-side heat exchanger is detected by the first temperature sensor, and the temperature signal is transmitted to the controller for analysis and processing to determine whether the temperature is too low and whether the wind-side heat exchanger needs to be defrosted.

[0014] Furthermore, it also includes a second temperature sensor for obtaining real-time changes in outdoor temperature; the second temperature sensor is communicatively connected to the controller, the outdoor temperature is detected by the second temperature sensor, and the temperature signal is transmitted to the controller for analysis and processing to determine whether the heat pump of the first-stage heat pump circulation system can be in the best operating state.

[0015] Compared with the prior art, the non-stop and frost-free dual-power self-regulating steam generator of the present invention has two heating stages. The first stage uses a heat pump to heat to a certain temperature, and the second stage uses gas to heat to the steam stage. By reading the real-time electricity price, outdoor temperature changes and gas price changes through the Internet, it is determined whether the electricity cost during this period is greater than the gas cost. If it is greater, full two-stage heating is adopted. If it is less, first-stage / second-stage segmented heating is adopted to achieve automatic switching of electricity-gas mixed or full gas mode to reduce production costs. In addition, it is possible to determine whether frost has formed based on the surface temperature of the wind-side heat exchanger. When the frost temperature is reached, the defrost water pump is turned on to send the antifreeze in the flue gas waste heat recovery water tank into the wind-side heat exchanger for non-stop defrosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the heating mode switching process of the present invention.

[0018] Figure 3 It is a schematic diagram of the defrosting process of the present invention.

[0019] Figure 4 It is a schematic diagram of the internal structure of the wind-side heat exchanger of the present invention.

[0020] Figure 5 This is a schematic diagram of the electricity price required to generate 10kw of heat at different temperatures according to the present invention.

[0021] Figure 6 It is a schematic diagram of the efficiency change curve of the heat pump at different outdoor temperatures of the present invention.

[0022] Figure 7 This is a schematic diagram of the temperature and electricity price changing with time when the same amount of heat is generated according to the present invention.

[0023] The components in the attached drawings are marked as follows: 1-compressor, 2-four-way valve, 3-air side heat exchanger, 4-throttle valve, 5-check valve, 6-expansion valve, 7-economizer, 8-condenser, 9-spray water circulation pump, 10-spray gas evaporator, 10a-gas inlet, 10b-nozzle, 10c-flue gas pipeline, 10d-steam outlet, 10e-spray circulation outlet, 11-flue gas waste heat recovery water tank, 12-defrost water pump, 13-first Temperature sensor, 14-refrigerating liquid pipeline, 15-defrosting pipeline, 16-cold water inlet line, 17-return pipeline, 18-hot water pipeline, 19-circulation pipeline, 20-exhaust pipeline, Y1-total gas cost, Y2-peak cost, Y3-average cost, Y4-valley cost, A-cost required for gas heating at 40℃, B-cost required for heat pump heating at 40℃, C-cost required for heat pump heating at 35℃, D-cost required for gas heating at 35℃. DETAILED DESCRIPTION

[0024] Embodiment 1:

[0025] like Figures 1 to 4 The non-stop and frost-free dual-power self-regulating steam generator shown includes a controller for whole machine control, a power grid system for obtaining electricity price charges in real time, and a gas system for obtaining gas price changes in real time; the controller is connected to the power grid system and the gas system through a wireless network; it also includes a primary heat pump circulation system and a secondary gas system; the primary heat pump circulation system and the secondary gas system are connected to the power grid system and the gas system respectively;

[0026] Among them, the heating is divided into two stages. The first stage uses a heat pump to heat to a certain temperature, and the second stage uses gas to heat to the steam stage. Through the network, the real-time electricity price, outdoor temperature changes and gas price changes are read to determine whether the electricity cost during this period is greater than the gas cost. If it is greater, full two-stage heating is adopted. If it is less, first-stage / second-stage segmented heating is adopted to realize electronic automatic control to switch between electricity-gas mixed use or full gas mode.

[0027] The primary heat pump circulation system includes a compressor 1, an air-side heat exchanger 3, an economizer 7 and a condenser 8; the compressor 1 is connected to the air-side heat exchanger 3 and the condenser 8 respectively through a four-way valve 2; the liquid inlet of the condenser 8 is connected to a cold water inlet line 16; the compressor 1 is connected to the economizer 7 through a return line 17; the condenser 8 is connected to the air-side heat exchanger 3 through a one-way valve 5; the economizer 7 is connected to the one-way valve 5 through a throttle valve 4, and an expansion valve 6 is also connected between the economizer 7 and the one-way valve 5; wherein the working principle of the primary heat pump circulation system is similar to that of the air source heat pump in the prior art. When working, the refrigeration The refrigerant is compressed into gas by the compressor 1 and enters the condenser 8 to release heat and condense. The condensed refrigerant liquid passes through the one-way valve 5, the expansion valve 6 and the economizer 7 in sequence and then enters the throttle valve 4 for throttling and pressure reduction. The outflowing refrigerant liquid enters the wind-side heat exchanger 3 through the one-way valve 5 to absorb the temperature of the environment for evaporation; at the same time, the wind-side heat exchanger 3 operates through the axial flow fan to send outdoor air into the wind-side heat exchanger 3 for heat exchange, and the air with reduced temperature is discharged from the system by the axial flow fan; the refrigerant inside the wind-side heat exchanger 3 absorbs heat and vaporizes and is sucked into the compressor 1; wherein, the wind-side heat exchanger 3 corresponds to the evaporator in the air source heat pump;

[0028] The secondary gas system includes a spray gas evaporator 10, a spray water circulation pump 9, a flue gas waste heat recovery water tank 11 and a defrost water pump 12; the spray gas evaporator 10 is connected to the condenser 8 through a hot water pipeline 18; the bottom of the spray gas evaporator 10 is connected to the spray water circulation pump 9 through a circulation pipeline 19, and the other end of the spray water circulation pump 9 is connected to the hot water pipeline 18; the spray gas evaporator 10 is connected to the flue gas waste heat recovery water tank 11 through a smoke exhaust pipeline 20; the flue gas waste heat recovery water tank 11 is connected to the wind side heat exchanger 3 through the defrost water pump 12.

[0029] In another embodiment, the spray-type gas evaporator 10 includes a gas furnace chamber; a steam outlet 10d is provided at the top of the gas furnace chamber; a spray circulation outlet 10e is provided at the bottom of the gas furnace chamber; the spray circulation outlet 10e is connected to the circulation pipeline 19; a gas inlet 10a is provided at the bottom of the side of the gas furnace chamber; a water inlet is provided on the side of the gas furnace chamber above the gas inlet 10a; the water inlet is connected to the hot water pipeline 18; a nozzle 10b is installed at the water inlet; a flue gas duct 10c is provided inside the gas furnace chamber, and the flue gas duct 10c extends from the side of the gas furnace chamber away from the water inlet to the outside, and the flue gas duct 10c is connected to the exhaust pipe 20. Tap water is also connected to the water inlet through a valve.

[0030] In yet another embodiment, the air-side heat exchanger 3 is provided with a defrost pipe 15 and a refrigerant liquid pipe 14 which are arranged in a spiral shape from top to bottom, and the defrost pipe 15 and the refrigerant liquid pipe 14 are arranged alternately.

[0031] In another embodiment, the four-way valve 2 is provided with first to fourth connecting pipes, and the first to fourth connecting pipes are respectively connected to the exhaust port of the compressor 1, the heat exchange outlet of the air side heat exchanger 3, the return air pipe of the compressor 1 and the medium inlet of the condenser 8.

[0032] In yet another embodiment, a first temperature sensor 13 is installed on the surface of the wind-side heat exchanger 3 ; the first temperature sensor 13 is communicatively connected with the defrost water pump 12 via a controller.

[0033] In yet another embodiment, a second temperature sensor (not shown) for acquiring outdoor temperature changes in real time is further included; the second temperature sensor is communicatively connected to the controller.

[0034] The working process of the non-stop and frost-free dual-power self-regulating steam generator of the present invention is as follows:

[0035] Heating is divided into two stages. The first stage uses a heat pump to heat to a certain temperature, and the second stage uses gas to heat to the steam stage. First, read the real-time electricity price, outdoor temperature changes, and gas price changes through the Internet to determine whether the electricity cost during this period is greater than the gas cost. If it is greater, full two-stage heating is adopted. If it is less, one-stage / two-stage segmented heating is adopted to realize electronic automatic control to switch between electricity-gas mixed mode or full gas mode. The heating process is as follows:

[0036] When the power consumption of the air source is lower than that of the gas generator under the same calorific value, the electric-gas mixed mode is adopted, and the controller equipped with the intelligent control system issues a command to start the primary heat pump circulation system for preliminary heating, so that the tap water first enters the primary heat pump circulation system and is heated to the specified temperature, and then enters the furnace cavity of the spray type gas evaporator 10 of the secondary gas system to be heated to the steam state, thereby saving energy consumption costs to the maximum extent; wherein, the high-temperature water below the furnace cavity of the spray type gas evaporator 10 is circulated again into the furnace cavity by the spray water circulation pump 9 for evaporation;

[0037] The specific steps are as follows:

[0038] After the power is turned on, the refrigerant is compressed into gas by the compressor 1 and then enters the condenser 8 to release heat and condense, and exchanges heat with the cold water sent to the condenser 8 to heat the cold water; then, the heated water is transported to the spray gas evaporator 10 through the hot water pipeline for secondary heating; and the condensed refrigerant liquid passes through the one-way valve 5, the expansion valve 6 and the economizer 7 in sequence and enters the throttle valve 4 for throttling and pressure reduction, and the outflowing refrigerant liquid enters the wind side heat exchanger 3 through the one-way valve 5 to absorb the temperature of the environment for evaporation, wherein the wind side heat exchanger 3 is operated by the axial flow fan to send outdoor air into the wind side heat exchanger 3 for heat exchange, and the air with reduced temperature is discharged from the system by the axial flow fan; at the same time, the refrigerant inside the wind side heat exchanger 3 absorbs heat and vaporizes and is sucked into the compressor 1;

[0039] Gas enters from the gas inlet 10a for combustion, water is sprayed from the nozzle 10b, and a water film is formed on the inner wall of the furnace cavity to increase the evaporation area, which can evaporate quickly, and steam is sprayed from the steam outlet 10d; the flue gas is discharged from the flue gas pipe 10c, enters the flue gas waste heat recovery water tank 11 for heat exchange, and is finally discharged;

[0040] The first temperature sensor 13 detects the surface temperature of the wind side heat exchanger 3. When the surface temperature reaches the frosting temperature, the defrosting water pump 12 is turned on to send the antifreeze liquid in the flue gas waste heat recovery water tank 11 into the defrosting pipe 15 of the wind side heat exchanger 3 for non-stop defrosting.

[0041] When the power consumption of the air source is greater than that of the gas generator when generating the same amount of heat, the full gas mode is adopted, and a controller equipped with an intelligent control system issues a command to shut down the power supply of the primary heat pump circulation system to stop the unit from running. Tap water is directly introduced into the furnace cavity of the spray gas evaporator 10 of the secondary gas system and heated to a steam state.

[0042] Application Example 1:

[0043] The electricity price is divided into three stages: peak electricity price, flat electricity price, and valley electricity price. The peak price in a certain place is 1.1 yuan, the flat price is 0.72 yuan, the valley price is 0.43 yuan, and the gas price is 3.6 yuan / Nm 3 ; Under the same heating conditions, the peak and valley electricity and gas costs at different temperatures are as follows: Figure 5 As shown;

[0044] like Figure 6 As shown, the efficiency of the heat pump will change with the outside temperature;

[0045] Energy saving calculation:

[0046] Under rated heating conditions, the heat pump efficiency is 300%;

[0047] 1 ton of water, heated from 15℃ to 55℃, consumes 40,000 kcal of heat. Then the air source heat pump heats 1 ton of water from 15 to 55℃, and consumes 4.186*1000*40=167440KJ=40,000 kcal of heat.

[0048] The average efficiency of heat pumps is 300%, and the efficiency of gas combustion is 99%;

[0049] The heat pump in the first stage consumes 15.5 kWh of electricity. If the commercial peak electricity price in the local cloud is 1.1 yuan, the cost is 17.05 yuan;

[0050] The first stage of gas combustion consumes 4.7Nm 3 , the average gas price is 3.6 yuan, so the cost is 16.92 yuan;

[0051] At this time, under the same calorific value, the cost of electricity consumed by the primary heat pump circulation system, i.e., the air source heat pump, is greater than the cost of gas consumed by the spray gas evaporator;

[0052] The heat pump in the first stage consumes 15.5 kWh of electricity. If the commercial valley electricity price in the local cloud is 0.43 yuan, the cost is 7.75 yuan;

[0053] The first stage of gas combustion consumes 4.7Nm 3 , the average gas price is 3.6 yuan, so the cost is 16.92 yuan;

[0054] At this time, under the same calorific value, the cost of electricity consumed by the primary heat pump circulation system, i.e., the air source heat pump, is less than the cost of gas consumed by the spray gas evaporator;

[0055] During the day, the temperature and electricity price will change with time. When the same amount of heat is generated, the total cost is different. The curve formed is as follows: Figure 7 As shown;

[0056] Under this condition, the air source heat pump heating in the first stage can save an average of 38% energy, and the comprehensive energy saving in the second stage can reach more than 18% (the specific energy saving needs to be calculated based on the actual local conditions).

[0057] The above embodiments are only preferred implementations of the present invention, so all equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A non-stop and frost-free dual-power self-regulating steam generator, comprising a controller for whole machine control, a power grid system for obtaining electricity prices in real time, and a gas system for obtaining gas price changes in real time; characterized in that: The controller is connected to the power grid system and the gas system through a wireless network; it also includes a primary heat pump circulation system and a secondary gas system; the primary heat pump circulation system and the secondary gas system are connected to the power grid system and the gas system respectively; The primary heat pump circulation system comprises a compressor, a wind-side heat exchanger, an economizer and a condenser; the compressor is respectively connected to the wind-side heat exchanger and the condenser through a four-way valve; the liquid inlet of the condenser is connected to a cold water inlet line; the compressor is connected to the economizer through a reflux pipeline; the condenser is connected to the wind-side heat exchanger through a one-way valve; the economizer is connected to the one-way valve through a throttle valve, and an expansion valve is also connected between the economizer and the one-way valve; The secondary gas system includes a spray gas evaporator, a spray water circulation pump, a flue gas waste heat recovery water tank and a defrost water pump; the spray gas evaporator is connected to the condenser through a hot water pipeline; the bottom of the spray gas evaporator is connected to the spray water circulation pump through a circulation pipeline, and the other end of the spray water circulation pump is connected to the hot water pipeline; the spray gas evaporator is connected to the flue gas waste heat recovery water tank through a smoke exhaust pipeline; the flue gas waste heat recovery water tank is connected to the wind side heat exchanger through a defrost water pump.

2. The non-stop and frost-free dual-power self-regulating steam generator according to claim 1 is characterized in that: The spray-type gas evaporator includes a gas furnace chamber; a steam outlet is provided at the top of the gas furnace chamber; a spray circulation outlet is provided at the bottom of the gas furnace chamber; the spray circulation outlet is connected to a circulation pipeline; a gas inlet is provided at the bottom of the side of the gas furnace chamber; a water inlet is provided on the side of the gas furnace chamber, above the gas inlet; the water inlet is connected to a hot water pipeline; a nozzle is installed at the water inlet; a flue gas duct is provided inside the gas furnace chamber, and the flue gas duct extends from the side of the gas furnace chamber away from the water inlet to the outside, and the flue gas duct is connected to a smoke exhaust pipeline.

3. The non-stop and frost-free dual-power self-regulating steam generator according to claim 2 is characterized in that: The water inlet is also connected to tap water through a valve.

4. The non-stop and frost-free dual-power self-regulating steam generator according to claim 1 is characterized in that: The air-side heat exchanger is provided with a defrost pipe and a refrigerant liquid pipe which are arranged in a spiral shape from top to bottom, and the defrost pipe and the refrigerant liquid pipe are arranged alternately.

5. The non-stop and frost-free dual-power self-regulating steam generator according to claim 1 is characterized in that: The four-way valve is provided with first to fourth connecting pipes, and the first to fourth connecting pipes are respectively connected to the exhaust port of the compressor, the heat exchange outlet of the air side heat exchanger, the return air pipe of the compressor and the medium inlet of the condenser.

6. The non-stop and frost-free dual-power self-regulating steam generator according to claim 1 is characterized in that: A first temperature sensor is installed on the surface of the wind-side heat exchanger; the first temperature sensor is communicatively connected with the defrost water pump through a controller.

7. The non-stop and frost-free dual-power self-regulating steam generator according to claim 1 is characterized in that: It also includes a second temperature sensor for obtaining outdoor temperature changes in real time; the second temperature sensor is communicatively connected to the controller.

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