A super heat pump unit for flue gas whitening and combined cooling and heating and its operation method

Abstract

The present invention proposes a flue gas deoxidation and cooling and heating combined super heat pump unit and its operation method, which belongs to the field of efficient energy utilization. The unit has three operation modes: deoxidation waste heat recovery when there is flue gas, hot water production when there is no flue gas, and cold water production when there is no flue gas. The flue gas heat exchanger uses two fluids to divide the flue gas heat exchange process into a flue gas precooling process and a water vapor condensation process. Compared with the existing heat exchanger technology, it significantly reduces the irreversible loss of the heat exchange process and significantly improves the heat transfer efficiency. It uses a single-stage or multi-stage heat pump in series to significantly increase the heating temperature or reduce the cooling temperature to achieve the recovery of deoxidation waste heat when there is flue gas, and meet the user's cooling or heating needs when there is no smoke. Multiple beneficial effects.

Description

Technical Field

[0001] The invention belongs to the technical field of energy utilization, and in particular relates to a flue gas deoxidation cooling and heating combined supply super heat pump unit. Background Art

[0002] Natural gas is increasingly used as a cleaner energy source. The main component of natural gas is methane, and the components produced by the combustion of methane are carbon dioxide and water vapor. The exhaust temperature of conventional boilers is 80℃ to 200℃. Since it contains a large amount of water vapor, there is a lot of heat that can be recovered in the flue gas. However, the water vapor in the flue gas needs to be reduced to below its dew point temperature to release a large amount of condensation heat, so the flue gas needs to be reduced to a lower temperature level.

[0003] The existing flue gas waste heat recovery technology mainly adopts the combination of heat pump and heat exchanger. Its defect is that it can only realize the single flue gas cooling and de-whitening function, and cannot meet the heating and cooling needs of users under flue gas-free conditions.

[0004] In this context, the present invention proposes a flue gas deoxidation and cooling and heating combined super heat pump unit, which has three operating modes: deoxidation waste heat recovery when there is flue gas, hot water production when there is no flue gas, and cold water production when there is no flue gas. The flue gas heat exchanger adopts a new design method of "energy level matching and step-by-step utilization", and divides the flue gas heat exchange process into a flue gas precooling process and a water vapor condensation process. Compared with the existing heat exchanger technology, it significantly reduces the irreversible loss of the heat exchange process and significantly improves the heat transfer efficiency. Summary of the invention

[0005] The present invention proposes a flue gas heat exchanger for cooling and heating. The flue gas heat exchanger adopts a new type of step-heat exchange, which divides the flue gas heat exchanger into a high-pressure chamber and a low-pressure chamber. Two fluids are used to pre-cool the flue gas and condense water vapor, respectively. Compared with conventional flue gas heat exchangers, the irreversible loss of the heat transfer process is significantly reduced, and the heat exchange efficiency is greatly improved. The unit adopts a high-efficiency electric heat pump, and uses a single-stage or multi-stage series connection to significantly increase the heating temperature or reduce the cooling temperature. The unit adopts a new process and operation method to achieve the multiple beneficial effects of heat recovery from whitening when there is flue gas, and meeting the cooling or heating needs of users when there is no flue gas.

[0006] A flue gas deoxidation combined cooling and heating super heat pump unit comprises a heat exchanger (1), a condenser (2), an evaporator (3), a compressor (4), a throttling device (5), a circulation pump A (6), a circulation pump B (7), a valve A (8), a valve B (9), a valve C (10), a valve D (11), a valve E (12), a valve F (13), a valve G (14), a hot water outlet (15), a hot water inlet (16), a cold water outlet (17), a cold water inlet (18), a gas inlet (19) and a gas outlet (20). The condenser (2) is connected to the valve A (8), the valve B (9), the compressor (4), the throttling device (5) and the heat exchanger (1); the compressor (4) is connected to the condenser (2) and the evaporator (3); the evaporator (3) is connected to the compressor (4), the throttling device (5), the valve C (10), the valve D (11), the circulating pump B (7) and the heat exchanger (1); the heat exchanger (1) is connected to the condenser (2), the valve E (12), the valve F (13), the gas inlet (19), the evaporator (3), the circulating pump B (7), the valve G (14) and the gas outlet (20); the throttling device (5) is connected to the condenser (2) and the evaporator (3); the circulating pump B (7) is connected to the evaporator (3), the valve G (14) and the heat exchanger (1); the valve A (8) is connected to the hot water outlet (21); The heat exchanger (1) is connected to a heat exchanger (1) and a hot water inlet (16). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (13). The heat exchanger (1) is connected to a heat exchanger (3) and a hot water inlet (16). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (15). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (11). The heat exchanger (1) is connected to a heat exchanger (3) and a cold water outlet (17). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (14). The heat exchanger (1) is connected to a heat exchanger (3) and a cold water outlet (17). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (15). The heat exchanger (1) is connected to a heat exchanger (3) and a cold water outlet (17). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (14).

[0007] A flue gas deoxidation and cooling and heating combined super heat pump unit adopts three operation modes:

[0008] ① Flue gas whitening condition: valve B (9), circulating pump A (6), valve E (12), valve D (11), and valve G (14) are closed, valve A (8), valve F (13), valve C (10), and circulating pump B (7) are opened, flue gas enters the heat exchanger (1) from the gas inlet (19), passes through the high-pressure chamber (1a) and the low-pressure chamber (1b) in sequence, and then leaves through the gas outlet (20), hot water passes through the hot water inlet (16), passes through the valve F (13), the heat exchanger (1), the condenser (2), and valve A (8) in sequence, and then leaves through the hot water outlet (15), the closed circulating water passes through the valve C (10), the evaporator (3), the heat exchanger (1), and the circulating pump B (7) to circulate back and forth, and the circulating working medium passes through the compressor (4), the condenser (2), the throttling device (5), and the evaporator (3) to circulate back and forth.

[0009] ② In the non-smoke heating condition, valve B (9), circulating pump A (6), valve E (12), valve D (11) and valve G (14) are closed, valve A (8), valve F (13), valve C (10) and circulating pump B (7) are opened, hot water passes through the hot water inlet (16), valve F (13), heat exchanger (1), condenser (2) and valve A (8) in sequence, and then leaves through the hot water outlet (15), air passes through the high pressure chamber (1a) and the low pressure chamber (1b) in sequence, and then leaves through the gas outlet (20), hot water passes through the hot water inlet (16), valve F (13), heat exchanger (1), condenser (2) and valve A (8) in sequence, and then leaves through the hot water outlet (15), closed circulating water passes through valve C (10), evaporator (3), heat exchanger (1) and circulating pump B (7) to circulate back and forth, and circulating working fluid passes through the compressor (4), condenser (2), throttling device (5) and evaporator (3) to circulate back and forth.

[0010] ③ In the smokeless refrigeration condition, valve A (8), valve F (13) and valve C (10) are closed, valve B (9), circulating pump A (6), valve E (12), circulating pump B (7), valve D (11) and valve G (14) are opened, air passes through the high-pressure chamber (1a) and the low-pressure chamber (1b) in sequence and leaves through the gas outlet (20), cold water passes through the cold water inlet (18) and then passes through valve G (14), circulating pump B (7), evaporator (3) and valve D (11) in sequence and leaves through the cold water outlet (17), the closed circulating water passes through valve B (9), circulating pump A (6), valve E (12), heat exchanger (1) and condenser (2) to circulate back and forth, and the circulating medium passes through the compressor (4), condenser (2), throttling device (5) and evaporator (3) to circulate back and forth.

[0011] A flue gas deoxidation and cooling and heating combined super heat pump unit can use a single-stage heat pump or a multi-stage heat pump in series to achieve different exhaust temperatures, heating temperatures or cooling temperatures to meet the user's wide range of cooling and heating load requirements. The circulating working fluid working in the compressor (4), condenser (2), throttling device (5) and evaporator (3) is a natural working fluid or Freon. The unit adopts a new type of step-by-step heat exchange flue gas heat exchanger, which is divided into a high-pressure chamber and a low-pressure chamber. Two fluids are used to pre-cool the flue gas and condense water vapor. Compared with conventional flue gas heat exchangers, the irreversible loss of the heat transfer process is significantly reduced, and the heat exchange efficiency is greatly improved. The heat exchanger adopts a non-direct contact or spray heat exchange method. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a system diagram of a flue gas whitening combined cooling and heating super heat pump unit.

[0013] Reference numerals:

[0014] 1-heat exchanger, 2-condenser, 3-evaporator, 4-compressor, 5-throttling device, 6-circulating pump A, 7-circulating pump B, 8-valve A, 9-valve B, 10-valve C, 11-valve D, 12-valve E, 13-valve F, 14-valve G, 15-hot water outlet, 16-hot water inlet, 17-cold water outlet, 18-cold water inlet, 19-gas inlet, 20-gas outlet DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] The flue gas deoxidation combined cooling and heating super heat pump unit comprises a heat exchanger (1), a condenser (2), an evaporator (3), a compressor (4), a throttling device (5), a circulation pump A (6), a circulation pump B (7), a valve A (8), a valve B (9), a valve C (10), a valve D (11), a valve E (12), a valve F (13), a valve G (14), a hot water outlet (15), a hot water inlet (16), a cold water outlet (17), a cold water inlet (18), a gas inlet (19) and a gas outlet (20). The condenser (2) is connected to the valve A (8), the valve B (9), the compressor (4), the throttling device (5) and the heat exchanger (1); the compressor (4) is connected to the condenser (2) and the evaporator (3); the evaporator (3) is connected to the compressor (4), the throttling device (5), the valve C (10), the valve D (11), the circulating pump B (7) and the heat exchanger (1); the heat exchanger (1) is connected to the condenser (2), the valve E (12), the valve F (13), the gas inlet (19), the evaporator (3), the circulating pump B (7), the valve G (14) and the gas outlet (20); the throttling device (5) is connected to the condenser (2) and the evaporator (3); the circulating pump B (7) is connected to the evaporator (3), the valve G (14) and the heat exchanger (1); the valve A (8) is connected to the hot water outlet (21); The heat exchanger (1) is connected to a heat exchanger (1) and a hot water inlet (16). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (13). The heat exchanger (1) is connected to a heat exchanger (3) and a hot water inlet (16). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (15). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (11). The heat exchanger (1) is connected to a heat exchanger (3) and a cold water outlet (17). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (14). The heat exchanger (1) is connected to a heat exchanger (3) and a cold water outlet (17). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (15). The heat exchanger (1) is connected to a heat exchanger (3) and a cold water outlet (17). The heat exchanger (1) is connected to a heat exchanger (3) and a valve (14).

[0017] The circulating working fluid working in the condenser (2), the throttling device (5), the evaporator (3) and the compressor (4) is R410a, and the circulating working fluid working in the valve C (10), the evaporator (3), the heat exchanger (1) and the circulating pump B (7) is an ethylene glycol aqueous solution. The unit adopts a single-stage compressor mode, and the heat exchanger adopts a partition heat exchanger mode.

[0018] The unit adopts three operating modes:

[0019] ① Flue gas deoxidation condition: the flue gas inlet and outlet temperatures of the heat exchanger (1) are 100°C / 5°C, the hot water temperature at the hot water inlet (16) is 35°C, and the hot water temperature at the hot water outlet (15) is 65°C. Valve B (9), circulation pump A (6), valve E (12), valve D (11), and valve G (14) are closed, valve A (8), valve F (13), valve C (10), and circulation pump B (7) are opened, and the flue gas enters the heat exchanger (1) from the gas inlet (19). The flue gas passes through the heat exchanger (1) in sequence. After passing through the high-pressure chamber (1a) and the low-pressure chamber (1b), the hot water leaves through the gas outlet (20). The hot water passes through the hot water inlet (16), the valve F (13), the heat exchanger (1), the condenser (2) and the valve A (8) in sequence, and leaves through the hot water outlet (15). The closed circulating water passes through the valve C (10), the evaporator (3), the heat exchanger (1) and the circulating pump B (7) to circulate back and forth. The circulating working medium passes through the compressor (4), the condenser (2), the throttling device (5) and the evaporator (3) to circulate back and forth.

[0020] ② No-smoke heating condition, the air inlet and outlet temperatures of the heat exchanger (1) are 33°C / 5°C, the hot water temperature at the hot water inlet (16) is 25°C, and the hot water temperature at the hot water outlet (15) is 55°C. Valve B (9), circulation pump A (6), valve E (12), valve D (11) and valve G (14) are closed, valve A (8), valve F (13), valve C (10) and circulation pump B (7) are opened, and hot water passes through the hot water inlet (16) and passes through valve F (13), heat exchanger (1), condenser (2) and valve A (8) in sequence. The air then leaves the hot water outlet (15), the air passes through the high pressure chamber (1a) and the low pressure chamber (1b) in sequence and leaves the hot water through the gas outlet (20), the hot water passes through the hot water inlet (16) in sequence and passes through the valve F (13), the heat exchanger (1), the condenser (2) and the valve A (8) and leaves the hot water outlet (15), the closed circulating water passes through the valve C (10), the evaporator (3), the heat exchanger (1) and the circulating pump B (7) to circulate back and forth, and the circulating working medium passes through the compressor (4), the condenser (2), the throttling device (5) and the evaporator (3) to circulate back and forth.

[0021] ③ Smokeless refrigeration condition, the inlet and outlet temperatures of the air at the heat exchanger (1) are 28°C / 36°C, the temperature of the cold water at the cold water inlet (18) is 12°C, the temperature of the cold water at the cold water outlet (17) is 5°C, valve A (8), valve F (13) and valve C (10) are closed, valve B (9), circulation pump A (6), valve E (12), circulation pump B (7), valve D (11) and valve G (14) are opened, and the air passes through the high pressure chamber (1a) and the low pressure chamber (1b) in sequence. ) and then leaves through the gas outlet (20); the cold water passes through the cold water inlet (18) and then passes through the valve G (14), the circulating pump B (7), the evaporator (3) and the valve D (11) in sequence and then leaves through the cold water outlet (17); the closed circulating water passes through the valve B (9), the circulating pump A (6), the valve E (12), the heat exchanger (1) and the condenser (2) to circulate back and forth; the circulating working fluid passes through the compressor (4), the condenser (2), the throttling device (5) and the evaporator (3) to circulate back and forth.

[0022] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A super heat pump unit for flue gas deoxidation and combined cooling and heating, characterized in that: The unit comprises a heat exchanger (1), a condenser (2), an evaporator (3), a compressor (4), a throttling device (5), a circulating pump A (6), a circulating pump B (7), a valve A (8), a valve B (9), a valve C (10), a valve D (11), a valve E (12), a valve F (13), a valve G (14), a hot water outlet (15), a hot water inlet (16), a cold water outlet (17), a cold water inlet (18), a gas inlet (19) and a gas outlet (20), wherein the condenser (2) and the valve Door A (8), valve B (9), compressor (4), throttling device (5) and heat exchanger (1) are connected; compressor (4) is connected to condenser (2) and evaporator (3); evaporator (3) is connected to compressor (4), throttling device (5), valve C (10), valve D (11), circulation pump B (7) and heat exchanger (1); heat exchanger (1) is connected to condenser (2), valve E (12), valve F (13), gas inlet (19), evaporator (3), circulation pump B (7), valve G (14) and The gas outlet (20) is connected, the throttling device (5) is connected to the condenser (2) and the evaporator (3), the circulating pump B (7) is connected to the evaporator (3), the valve G (14) and the heat exchanger (1), the valve A (8) is connected to the hot water outlet (15), the valve B (9) and the condenser (2), the valve B (9) is connected to the valve A (8), the condenser (2) and the circulating pump A (6), the circulating pump A (6) is connected to the valve B (9) and the valve E (12), the valve E (12) is connected to the circulating pump A (6), the heat exchanger (1) The valve (13) is connected to the valve F (13), the valve F (13) is connected to the valve E (12), the heat exchanger (1) and the hot water inlet (16), the valve C (10) is connected to the evaporator (3) and the valve D (11), the valve D (11) is connected to the valve C (10), the evaporator (3) and the cold water outlet (17), the valve G (14) is connected to the circulation pump B (7), the heat exchanger (1) and the cold water inlet (18), wherein the heat exchanger (1) is composed of a high-pressure chamber (1a) and a low-pressure chamber (1b), and the unit adopts three operating modes: ① Flue gas whitening condition: valve B (9), circulating pump A (6), valve E (12), valve D (11), and valve G (14) are closed, valve A (8), valve F (13), valve C (10), and circulating pump B (7) are opened, flue gas enters the heat exchanger (1) from the gas inlet (19), passes through the high-pressure chamber (1a) and the low-pressure chamber (1b) in sequence, and then leaves through the gas outlet (20); hot water passes through the hot water inlet (16), valve F (13), heat exchanger (1), condenser (2), and valve A (8) in sequence, and then leaves through the hot water outlet (15); the closed circulating water passes through valve C (10), evaporator (3), heat exchanger (1), and circulating pump B (7) to circulate back and forth; the circulating medium passes through the compressor (4), condenser (2), throttling device (5), and evaporator (3) to circulate back and forth; ② In the non-smoke heating condition, valve B (9), circulating pump A (6), valve E (12), valve D (11) and valve G (14) are closed, valve A (8), valve F (13), valve C (10) and circulating pump B (7) are opened, hot water passes through the hot water inlet (16), valve F (13), heat exchanger (1), condenser (2) and valve A (8) in sequence, and then leaves through the hot water outlet (15), air passes through the high-pressure chamber (1a) and the low-pressure chamber (1b) in sequence, and then leaves through the gas outlet (20), hot water passes through the hot water inlet (16), valve F (13), heat exchanger (1), condenser (2) and valve A (8) in sequence, and then leaves through the hot water outlet (15), the closed circulating water passes through valve C (10), evaporator (3), heat exchanger (1) and circulating pump B (7) to circulate back and forth, and the circulating working medium passes through the compressor (4), condenser (2), throttling device (5) and evaporator (3) to circulate back and forth; ③ In the smokeless refrigeration condition, valve A (8), valve F (13) and valve C (10) are closed, valve B (9), circulating pump A (6), valve E (12), circulating pump B (7), valve D (11) and valve G (14) are opened, air passes through the high-pressure chamber (1a) and the low-pressure chamber (1b) in sequence and leaves through the gas outlet (20), cold water passes through the cold water inlet (18) and then passes through valve G (14), circulating pump B (7), evaporator (3) and valve D (11) in sequence and leaves through the cold water outlet (17), the closed circulating water passes through valve B (9), circulating pump A (6), valve E (12), heat exchanger (1) and condenser (2) to circulate back and forth, and the circulating medium passes through the compressor (4), condenser (2), throttling device (5) and evaporator (3) to circulate back and forth.

2. A flue gas deoxidation and cooling and heating combined super heat pump unit according to claim 1, characterized in that: The heat exchanger (1) is composed of a high-pressure chamber (1a) and a low-pressure chamber (1b). The heat exchanger (1) uses different fluids and gases to perform heat exchange.

3. The super heat pump unit for flue gas deoxidation and cooling and heating according to claim 1 is characterized in that: The heat exchanger (1) adopts a partition type heat exchanger or a spray type heat exchanger.

4. The super heat pump unit for flue gas whitening and combined cooling and heating according to claim 1 is characterized in that: The evaporator (3) and the condenser (2) adopt a single-stage or multi-stage series structure.

5. The super heat pump unit for flue gas deoxidation and combined cooling and heating according to claim 1 is characterized in that: The circulating working fluid working in the compressor (4), the condenser (2), the throttling device (5) and the evaporator (3) is a natural working fluid or Freon.

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