Lithium bromide heat pump heating device

Abstract

The utility model discloses a lithium bromide heat pump heating device, which belongs to the technical field of energy conservation and waste heat recovery and comprises a waste gas heat exchange module, a lithium bromide heat pump module, a heating water circulation module and a gas conveying pipe for conveying waste gas. The first-stage heat exchanger acts on waste gas with the temperature being 300 DEG C or above, the second-stage heat exchanger acts on waste gas with the temperature being 100-300 DEG C, the lithium bromide heat pump module comprises a generator and an evaporator, the heating water circulation module comprises a heating water path, and a temperature sensor is arranged on the side wall of the side, close to the waste gas heat exchange module, of a gas conveying pipe. The end, close to the waste gas heat exchange module, of the gas conveying pipe is connected with the first-stage heat exchanger and the second-stage heat exchanger through valves. Compared with a traditional heat exchange device, when the lithium bromide heat pump heating device is used, the heat recovery efficiency is improved, and the waste gas waste heat recycling effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of energy saving and waste heat recovery, specifically relates to a lithium bromide heat pump heating device. BACKGROUND

[0002] At present, industrial waste heat recovery has important significance in reducing energy waste, reducing carbon emissions and improving energy utilization. A large amount of high-temperature waste gas generated in many industrial processes (such as metallurgy, glass manufacturing, chemical industry and power) contains considerable heat resources, and if these waste heat can be effectively recovered for heating or other purposes, the energy consumption of industrial enterprises will be greatly reduced. However, waste heat recovery still faces many technical problems.

[0003] The existing waste heat recovery system usually uses a simple heat exchange device to transfer the heat of the waste gas to the working medium such as water or heat conducting oil, and realizes waste heat utilization through working medium circulation. However, the heat recovery efficiency of the traditional heat exchange device is low, especially when the waste gas temperature is low, the heat exchange effect is obviously reduced. The traditional absorption heat pump system mainly relies on high-temperature combustor to provide heat source, and does not fully utilize the heat at different temperature sections in the waste gas, resulting in that the heat pump system has low efficiency under low-temperature waste gas condition and it is difficult to fully utilize the waste heat in the waste gas. SUMMARY

[0004] The utility model discloses a lithium bromide heat pump heating device to solve the problem of low heat recovery efficiency of the traditional heat exchange device and difficulty in fully utilizing the waste heat in the waste gas in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical scheme: a lithium bromide heat pump heating device, comprising a waste heat exchange module, a lithium bromide heat pump module and a heating water circulation module, and a gas conveying pipe conveying waste gas;

[0006] The above-mentioned waste heat exchange module comprises a primary heat exchanger and a secondary heat exchanger, the primary heat exchanger acts on the waste gas with a temperature above 300 DEG C, and the secondary heat exchanger acts on the waste gas with a temperature of 100-300 DEG C;

[0007] The above-mentioned lithium bromide heat pump module comprises a generator and an evaporator;

[0008] The above-mentioned heating water circulation module comprises a heating water circuit.

[0009] In one embodiment, the temperature sensor is arranged on the side wall of the waste heat exchange module, and the end of the gas conveying pipe close to the waste heat exchange module is connected to the primary heat exchanger and the secondary heat exchanger through the valve.

[0010] In one of the embodiments, one side of the generator is connected to the first heat exchanger through a communication pipe, and the other side of the generator is connected to the condenser through a communication pipe.

[0011] In one of the embodiments, one side of the evaporator is connected to the second heat exchanger through a communication pipe, and the other side of the evaporator is connected to the absorber through a communication pipe.

[0012] In one of the embodiments, a gas conveying branch pipe is fixed between the first heat exchanger and the second heat exchanger.

[0013] In one of the embodiments, the condenser and the absorber are both connected to the heating water circuit through communication pipes.

[0014] Advantages

[0015] Technical effects and advantages of the lithium bromide heat pump heating device:

[0016] During the use of the lithium bromide heat pump heating device, one or two heat exchangers can be selected according to the temperature range of the waste gas, which improves the waste heat recovery effect to a certain extent, and the waste heat in the waste gas can be recovered in a suitable way according to the temperature of the waste gas. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 The structure block diagram of the lithium bromide heat pump heating device is shown in the figure.

[0019] Figure 2 The structure block diagram of the waste gas heat exchange module is shown in the figure.

[0020] Figure 3 The structure block diagram of the lithium bromide heat pump module is shown in the figure.

[0021] Figure 4 The flow chart of the lithium bromide heat pump heating device is shown in the figure.

[0022] Figure 5 The structure schematic diagram of the lithium bromide heat pump heating device is shown in the figure.

[0023] Figure 6 The information transmission diagram of the temperature sensor, the central controller and the valve is shown in the figure.

[0024] Fig.:

[0025] 1, gas pipe; 11, temperature sensor; 12, valve; 13, communication pipe;

[0026] 21, primary heat exchanger; 22, generator; 23, condenser; 24, gas branch pipe;

[0027] 31, secondary heat exchanger; 32, evaporator; 33, absorber;

[0028] 4, heating water circuit; 5, low-temperature utilization equipment. DETAILED DESCRIPTION

[0029] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application, however, it is obvious to those skilled in the art that the present application can be implemented without one or more of these details, in order to avoid confusion with the present application, some technical features known in the art are not described.

[0030] Unless the direction is defined separately, the directions such as up, down, left, right, front, back, inside and outside mentioned in this paper are based on the directions such as up, down, left, right, front, back, inside and outside in the drawings of the present application, which are explained here.

[0031] The connection mode can adopt existing modes such as bonding, welding, bolt connection, etc., and the actual needs are accurate.

[0032] Please refer to a kind of lithium bromide heat pump heating device as Figures 1-5 As shown in the figure, the lithium bromide heat pump heating device includes waste heat exchange module, lithium bromide heat pump module and heating water circulation module, and gas pipe 1 for conveying waste gas.

[0033] When the waste heat in the waste gas needs to be recycled, the waste gas is introduced into the gas pipe 1.

[0034] In this embodiment, the waste heat exchange module includes a primary heat exchanger 21 and a secondary heat exchanger 31, the primary heat exchanger 21 acts on the waste gas with a temperature above 300℃, the secondary heat exchanger 31 acts on the waste gas with a temperature of 100-300℃, the temperature sensor 11 is arranged on the side wall of the waste heat exchange module close to the gas pipe 1, and the end of the gas pipe 1 close to the waste heat exchange module is connected with the primary heat exchanger 21 and the secondary heat exchanger 31 through the valve 12.

[0035] The gas pipe 1 is provided with a waste gas pretreatment module in front of the temperature sensor 11, wherein the waste gas pretreatment module comprises a waste gas filter, a waste gas dehumidifier and a waste gas stabilizing device. The waste gas filter is used to remove dust and particulate matter in the waste gas, protecting the operation of the heat exchanger and subsequent equipment; the waste gas dehumidifier is used to reduce the moisture in the waste gas to prevent the inner surface of the condenser 23 and the heat exchanger from being scaled; the waste gas stabilizing device is used to control the waste gas flow to avoid the influence of waste gas fluctuation on the heat exchange efficiency. Through these structures for pretreating the waste gas, impurities in the waste gas are treated, and the probability of impurities damaging the waste gas heat exchange module is reduced.

[0036] As shown in Figure 1 , Figures 4-6 The gas pipe 1 is provided with a valve 12 between the gas pipe 1 and the waste gas heat exchange module, and a temperature sensor 11 is provided in front of the valve 12. The purpose of this structure is:

[0037] When the waste gas passes through the gas pipe 1, the temperature sensor 11 detects the temperature of the waste gas, and the temperature sensor 11 transmits the measured temperature to the central controller to determine whether it should be introduced into the primary heat exchanger 21 or the secondary heat exchanger 31. After the determination, the central controller transmits a signal to the valve 12 to control the connection of the gas pipe 1 with the primary heat exchanger 21 or the secondary heat exchanger 31, so as to introduce the waste gas into different waste gas heat exchange modules according to the temperature of the waste gas.

[0038] A gas branch pipe 24 is fixed between the primary heat exchanger 21 and the secondary heat exchanger 31. When the temperature of the waste gas after passing through the primary heat exchanger 21 is in the range of 100-300℃, the gas at this time can be introduced into the secondary heat exchanger 31 through the gas branch pipe 24. Because when the temperature of the waste gas is above 300℃, the primary heat exchanger 21 has high treatment efficiency; when the temperature of the waste gas is in the range of 100-300℃, the secondary heat exchanger 31 has high treatment efficiency.

[0039] When the temperature of the waste gas is lower than 100℃, the pretreated waste gas is directly introduced into the low-temperature utilization equipment 5 for use, wherein the low-temperature utilization equipment 5 can be a tail gas waste heat power generation device or a low-temperature refrigeration device, which can improve the recycling effect of the waste heat in the waste gas with a temperature lower than 100℃.

[0040] The primary heat exchanger 21 is provided with structures such as high-efficiency heat-conducting materials, high-temperature gas flow distributors and heat energy splitters. The high-efficiency heat-conducting materials are used to mark the materials (such as high-temperature-resistant alloy or ceramic heat exchange pipe) used in the primary heat exchanger 21 to improve the heat conduction performance; the high-temperature gas flow distributor is used to optimize the gas flow direction in the primary heat exchanger 21 to ensure the uniformity of heat exchange; and the heat energy splitter is used to transfer part of the waste gas heat to the condenser 23 for producing condensed water.

[0041] The secondary heat exchanger 31 is provided with a waste heat recovery pump, a high-efficiency insulation layer and an intelligent flow regulating valve. The waste heat recovery pump is used to drive the low-temperature water circulation system or other regional heating with the heat extracted from the secondary heat exchanger 31; the high-efficiency insulation layer is used to reduce heat loss of the secondary heat exchanger 31 and improve energy utilization efficiency; and the intelligent flow regulating valve is used to automatically regulate the flow rate according to the waste gas temperature, so as to ensure the optimal operating condition of the heat exchanger.

[0042] The above materials and structures can improve the heat exchange effect of the hot gas in the primary heat exchanger 21 and the secondary heat exchanger 31.

[0043] After the hot waste gas flows through the primary heat exchanger 21 and the secondary heat exchanger 31, the hot waste gas enters the tail gas treatment module, which includes a desulfurization and denitrification device, a tail gas waste heat power generation module and an environmental protection emission detector. The desulfurization and denitrification device is used to remove sulfur dioxide and nitrogen oxides in the waste gas to ensure that the waste gas meets the emission standard; the tail gas waste heat power generation module is used to generate power with the residual heat in the waste gas to support the energy self-sufficiency of the system; and the environmental protection emission detector is used to monitor the concentration of harmful substances in the tail gas in real time and feed back to the central control system.

[0044] In this embodiment, the lithium bromide heat pump module includes a generator 22, one side of the generator 22 is connected to the primary heat exchanger 21 through the communication pipe 13, and the other side of the generator 22 is connected with a condenser 23 through the communication pipe 13.

[0045] The lithium bromide heat pump module includes an evaporator 32, one side of the evaporator 32 is connected to the secondary heat exchanger 31 through the communication pipe 13, and the other side of the evaporator 32 is connected with an absorber 33 through the communication pipe 13.

[0046] The heating water circulation module includes a heating water circuit 4, and the condenser 23 and the absorber 33 are both connected to the heating water circuit 4 through the communication pipe 13.

[0047] As shown in Figures 1-5 The generator 22 is used to regenerate the dilute lithium bromide solution into a concentrated solution and release water vapor with the high-temperature medium flowing into the primary heat exchanger 21, and the water vapor generated in the generator 22 is condensed by the condenser 23 to transfer heat to the heating water circuit 4.

[0048] The evaporator 32 is used to flow into the low-temperature water preheated in the secondary heat exchanger 31, absorb heat during the evaporation process, and dilute the lithium bromide solution, and the dilute lithium bromide solution absorbs the heat of the water vapor in the absorber 33 to release heat directly to the heating water circuit 4.

[0049] The waste heat in the waste gas can be recycled through the primary heat exchanger 21 and the secondary heat exchanger 31.

[0050] Working principle: the technical scheme utilizes the principle that the first heat exchanger 21 and the second heat exchanger 31 have different treatment efficiencies for different temperature waste gas, when the waste gas is input, the waste gas is input into the first heat exchanger 21 and the second heat exchanger 31 according to different temperatures, then under the action of the respective lithium bromide heat pump module and the heating water circulation module, the waste heat in the waste gas is moved to the heating water circulation module through the waste gas heat exchange module and the lithium bromide heat pump module, realizing the waste heat recycling of the waste gas, if the temperature of the waste gas is lower than 100 DEG C, then the low-temperature waste gas is directly input into the low-temperature utilization equipment 5.

[0051] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lithium bromide heat pump heating device, characterized in that: It includes an exhaust gas heat exchange module, a lithium bromide heat pump module, a heating water circulation module, and a gas transmission pipe (1) for transmitting the exhaust gas; The exhaust gas heat exchange module includes a primary heat exchanger (21) and a secondary heat exchanger (31), wherein the primary heat exchanger (21) acts on exhaust gas with a temperature above 300° C., and the secondary heat exchanger (31) acts on exhaust gas with a temperature between 100° C. and 300° C.; The lithium bromide heat pump module includes a generator (22) and an evaporator (32); The heating water circulation module comprises a heating water circuit (4).

2. A lithium bromide heat pump heating device according to claim 1, characterized in that: A temperature sensor (11) is provided on a side wall of the gas delivery pipe (1) close to the exhaust gas heat exchange module, and one end of the gas delivery pipe (1) close to the exhaust gas heat exchange module is connected to the primary heat exchanger (21) and the secondary heat exchanger (31) via a valve (12).

3. A lithium bromide heat pump heating device according to claim 1, characterized in that: One side of the generator (22) is connected to the primary heat exchanger (21) via a connecting pipe (13), and the other side of the generator (22) is connected to the condenser (23) via a connecting pipe (13).

4. A lithium bromide heat pump heating device according to claim 3, characterized in that: One side of the evaporator (32) is connected to the secondary heat exchanger (31) via a connecting pipe (13), and the other side of the evaporator (32) is connected to the absorber (33) via a connecting pipe (13).

5. A lithium bromide heat pump heating device according to claim 4, characterized in that: A gas transmission branch pipe (24) is fixed between the first-stage heat exchanger (21) and the second-stage heat exchanger (31).

6. A lithium bromide heat pump heating device according to claim 5, characterized in that: The condenser (23) and the absorber (33) are both connected to the heating water circuit (4) via a connecting pipe (13).

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