Two-stage flue gas decontamination, water collection and waste heat recovery device

Abstract

The utility model discloses a two-stage flue gas decontamination, water collection and waste heat recovery device which is characterized by comprising a flue gas inlet, a decontamination section, a waste heat recovery water condensation section, a liquid blocking section and a flue gas outlet, the decontamination section comprises a decontamination spraying pipe system, a decontamination pump and an overflow pipe, and further comprises a sewage heat exchanger if necessary; the waste heat recovery condensate water section comprises a cooling spraying pipe system, a spraying pump, a heat pump unit, a rain blocking flue set, a condensate water valve and a water supplementing valve. The flue gas is washed by spraying water in the decontamination section, most pollutants are washed off, and pollution is discharged along with overflow; cleaner flue gas enters the waste heat recovery condensate water section, waste heat is recovered by the heat pump unit, one part of generated clean condensate water is reused, and the other part of the generated clean condensate water is supplemented to the decontamination section. According to the utility model, the flue gas waste heat is recovered, clean condensate water is generated and can be reused, and sewage is discharged, so that the functions of dirt removal and water collection are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat utilization, and in particular relates to a two-stage flue gas decontamination and water collection and waste heat recovery device. Background Art

[0002] Flue gas waste heat recovery projects usually use a single-stage spray heat exchanger. While recovering waste heat, this type of heat exchanger condenses the water vapor in the flue gas, mixes it with spray water, and then discharges the excess water. Since the spray water is in direct contact with the flue gas, the discharged condensate contains pollutants in the flue gas. If there are many pollutants in the flue gas, especially when the barrier liquid effect of the front-stage desulfurization tower is poor and the flue gas slurry content is high, the pollutant content in the condensate discharged from the single-stage spray heat exchanger is very high, making it very difficult to discharge or reuse it. In view of this situation, there is an urgent need for a spray heat exchanger that can perform graded treatment on flue gas with a high level of pollutants, first reducing the pollutant content, then recovering waste heat and producing cleaner condensate for reuse, thus achieving the triple effects of pollution removal, waste heat recovery, and water collection. Utility Model Content

[0003] (1) Purpose of the utility model

[0004] The purpose of the utility model is to provide a flue gas decontamination and water collection and waste heat recovery device, which can achieve the triple effects of flue gas decontamination, waste heat recovery and production of relatively clean condensate.

[0005] (2) Technical solution

[0006] To address the above-mentioned issues, the present invention provides a two-stage flue gas decontamination, water collection, and waste heat recovery device, comprising a flue gas inlet, a decontamination section, a waste heat recovery condensation section, a liquid retaining section, and a flue gas outlet. The flue gas inlet is connected to the decontamination section, which is in turn connected to the waste heat recovery condensation section via a rain-retaining flue assembly. The waste heat recovery condensation section is connected to the liquid retaining section, which in turn is connected to the flue gas outlet.

[0007] The decontamination section includes a decontamination spray piping system, a decontamination pump, and an overflow pipe. The decontamination pump inlet is connected to the decontamination section water tank, and the outlet is connected to the decontamination spray piping system. The overflow pipe is located on the side wall of the decontamination section. When the inlet flue gas temperature is high, a sewage heat exchanger is installed between the decontamination pump and the decontamination spray piping system.

[0008] The waste heat recovery condensate section includes a cooling spray piping system, a spray pump, a heat pump unit, a rain-shielding flue system, a condensate valve, and a make-up valve. The spray pump inlet is connected to the waste heat recovery condensate section water tank, and the outlet is connected to the heat pump unit, which in turn is connected to the cooling spray piping system. One side of the condensate valve is connected to the cooling spray piping main pipe, and the other side is for external discharge. One side of the make-up valve is connected to the cooling spray piping main pipe, and the other side is connected to the decontamination section. The heat pump unit can be either an absorption or compression heat pump.

[0009] (3) Beneficial effects

[0010] The above technical solution of the utility model has the following beneficial technical effects:

[0011] The utility model is used in situations where the flue gas contains a high level of pollutants or the exhaust gas temperature is high. The first-stage decontamination section has the effects of flue gas decontamination and spray humidification, reducing the pollutant content of the flue gas entering the waste heat recovery condensation section, reducing the flue gas volume and flow rate, facilitating better heat exchange in the waste heat recovery condensation section, and the water with a high pollutant content is discharged through overflow; the waste heat recovery condensation section recovers waste heat while generating relatively clean condensed water, which only requires simple treatment for external discharge or reuse; a portion of the relatively clean condensed water returns to the decontamination section to ensure that the decontamination section continuously overflows and dilutes the water quality in the decontamination section. The utility model can decontaminate the flue gas in advance while recovering waste heat, achieve separation of sewage and clean water, and facilitate condensed water reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0013] Figure 2 It is a structural diagram of embodiment 2 of the present utility model.

[0014] Reference numerals:

[0015] 1: Flue gas inlet; 2: Sewage removal section; 3: Waste heat recovery condensate section; 4: Liquid barrier section; 5: Flue gas outlet; 21: Sewage removal spray piping system; 22: Sewage removal pump; 23: Overflow pipe; 24: Sewage heat exchanger; 31: Cooling spray piping system; 32: Rainproof flue group; 33: Heat pump unit; 34: Spray pump; 35: Condensate valve; 36: Water supply valve. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0017] Figure 1 It is a structural diagram of embodiment 1 of the present utility model.

[0018] like Figure 1 As shown, the two-stage flue gas decontamination, water collection and waste heat recovery device includes a flue gas inlet 1, a decontamination section 2, a waste heat recovery and condensation section 3, a liquid blocking section 4 and a flue gas outlet 5.

[0019] The flue gas inlet 1 is connected to the decontamination section 2, the decontamination section 2 is connected to the waste heat recovery condensation section 3 through the rainproof flue group 32, the waste heat recovery condensation section 3 is connected to the liquid blocking section 4, and the liquid blocking section 4 is connected to the flue gas outlet 5.

[0020] The decontamination section 2 includes a decontamination spray pipe system 21, a decontamination pump 22, and an overflow pipe 23. The inlet of the decontamination pump 22 is connected to the water tank of the decontamination section 2, and the outlet is connected to the decontamination spray pipe system 21. The overflow pipe 23 is located on the side wall of the decontamination section 2.

[0021] The waste heat recovery condensate section 3 includes a cooling spray piping system 31, a spray pump 34, a heat pump unit 33, a rain-shielding flue assembly 32, a condensate valve 35, and a water supply valve 36. The inlet of the spray pump 34 is connected to the water tank of the waste heat recovery condensate section 3, and the outlet is connected to the heat pump unit 33, which in turn is connected to the cooling spray piping system 31. One side of the condensate valve 35 is connected to the main pipe of the cooling spray piping system 31, and the other side discharges the water. One side of the water supply valve 36 is connected to the main pipe of the cooling spray piping system 31, and the other side is connected to the decontamination section 2. The heat pump unit 33 can be an absorption heat pump or a compression heat pump.

[0022] When the equipment is working, the flue gas first enters the decontamination section 2 through the flue gas inlet 1. After being sprayed by the decontamination spray pipe system 21, the flue gas temperature is reduced, the pollutants are removed and enter the water, and the clean saturated flue gas enters the rain shielding flue group 32 of the waste heat recovery condensation section 3, and is then sprayed and cooled by the cooling spray pipe system 31 to produce relatively clean condensed water. It then enters the decontamination section 4 to remove the small droplets it carries, and is finally discharged through the flue gas outlet 5.

[0023] The spray water from the cooling spray piping system 31 of the waste heat recovery condensate section 3 is mixed with the flue gas condensate and then pressurized by the spray pump 34 before entering the heat pump unit 33 for cooling and heat release. It then re-enters the cooling spray piping system 31. Due to the generation of condensed water, a portion of the spray water is drawn out of the heat pump outlet. This water can be discharged through the condensate valve 35 for simple treatment before being discharged or reused. Alternatively, it can be fed through the water replenishment valve 36 into the decontamination section 2, ensuring continuous overflow and diluting pollutants.

[0024] After the spray water from the decontamination section 2 is sprayed out through the decontamination spray pipe system 21, it cleans the flue gas. The spray water containing pollutants falls into the bottom water tank and mixes with the make-up water from the waste heat recovery condensate section 3. Part of the mixed water is pressurized by the decontamination pump 22 and enters the decontamination spray pipe system 21 for recycling, and the other part continuously overflows through the overflow pipe 23 to reduce the pollutant concentration in the spray water.

[0025] Figure 2 It is a structural diagram of embodiment 2 of the present utility model.

[0026] This embodiment and Figure 1The difference is that a sewage heat exchanger 24 is installed between the sewage pump 22 and the sewage spray piping system 21. When the inlet flue gas temperature is high, to avoid excessive evaporation of the sewage spray water and improve the economic efficiency of the project, the sewage heat exchanger 24 is used to recover the heat from the high-temperature flue gas, thereby reducing the cost of waste heat recovery.

Claims

1. A two-stage flue gas decontamination, water collection and waste heat recovery device, characterized in that: It includes a flue gas inlet (1), a decontamination section (2), a waste heat recovery condensation section (3), a liquid blocking section (4), and a flue gas outlet (5); The decontamination section (2) includes a decontamination spray pipe system (21) and a decontamination pump (22); The waste heat recovery condensate section (3) includes a cooling spray pipe system (31), a spray pump (34), a heat pump unit (33), and a rainproof flue group (32); The flue gas inlet (1) is connected to the decontamination section (2); The decontamination section (2) is connected to the waste heat recovery condensation section (3) via the rain shielding flue group (32); The waste heat recovery condensation section (3) is connected to the liquid blocking section (4); The liquid blocking section (4) is connected to the smoke outlet (5); The inlet of the decontamination pump (22) is connected to the decontamination section (2), and the outlet of the decontamination pump (22) is connected to the decontamination spray pipe system (21); The inlet of the spray pump (34) is connected to the waste heat recovery condensate section (3), the outlet of the spray pump (34) is connected to the heat pump unit (33), and the heat pump unit (33) is connected to the cooling spray pipe system (31).

2. The two-stage flue gas decontamination, water collection and waste heat recovery device according to claim 1 is characterized in that: Also includes: Overflow pipe (23), condensate valve (35), water supply valve (36); The overflow pipe (23) is located on the side wall of the decontamination section (2); The condensate valve (35) is connected to the cooling spray pipe system (31); The water supply valve (36) is connected to the cooling spray pipe system (31), and the water supply valve (36) is connected to the decontamination section (2).

3. The two-stage flue gas decontamination, water collection and waste heat recovery device according to claim 1 is characterized in that: Also includes: Sewage heat exchanger (24); The sewage heat exchanger (24) is connected to the sewage removal pump (22), and the sewage heat exchanger (24) is connected to the sewage removal spray pipe system (21).

4. The two-stage flue gas decontamination, water collection and waste heat recovery device according to claim 1 is characterized in that: The heat pump unit (33) is an absorption heat pump.

5. The two-stage flue gas decontamination, water collection and waste heat recovery device according to claim 1 is characterized in that: The heat pump unit (33) is a compression heat pump.

Images