Sewage source biogas slurry waste heat recovery system

Abstract

The utility model discloses a sewage source biogas slurry waste heat recovery system which comprises a biogas slurry pool used for providing biogas slurry, anaerobic biogas slurry enters the biogas slurry pool through a centrifugal machine, and the biogas slurry at the temperature of 35 DEG C is provided; the shell-and-tube heat exchanger is arranged between the biogas slurry tank and the heat pump and is used for transferring waste heat in the biogas slurry tank to circulating water of the heat pump, so that the temperature of the circulating water on the evaporation side of the heat pump is increased to 33 DEG C, and the temperature of the biogas slurry is reduced to 25 DEG C; the inlet water temperature of circulating water at the evaporation side of the heat pump is 33 DEG C, 65 DEG C hot water at the condensation side is used for heating water in the raw material pool through the plate heat exchanger, the temperature of the circulating water at the evaporation side is reduced to 23 DEG C after evaporation, and the circulating water flows back to the shell-and-tube heat exchanger and the plate heat exchanger and is arranged between the heat pump and the raw material pool; 65 DEG C hot water received from the condensation side of the heat pump is used for transferring heat of the heat pump to water in the raw material pool, and the hot water subjected to heat transfer flows back to the condensation side of the heat pump. The system realizes efficient recovery and reutilization of waste heat in the biogas slurry through a specific heat exchanger structure and a heat pump technology.

Description

TECHNICAL FIELD

[0001] The utility model discloses a kind of sewage source biogas liquid waste heat recovery systems, belong to environmental protection energy utilization technical field. BACKGROUND

[0002] In the biogas slurry generated in agriculture, breeding and other industries, a large amount of heat energy is not effectively utilized, direct discharge not only causes energy waste, but also may cause burden to the environment. Therefore, developing a system capable of effectively recovering and utilizing the waste heat in biogas slurry is of great significance for improving energy utilization efficiency and promoting sustainable development. INVENTION CONTENTS

[0003] To solve the above problems, the utility model provides a kind of sewage source biogas liquid waste heat recovery system, the system is through specific heat exchanger structure and heat pump technology, realizes the efficient recovery and reuse of waste heat in biogas slurry.

[0004] The specific technical scheme is as follows:

[0005] A kind of sewage source biogas liquid waste heat recovery system, comprising:

[0006] Biogas slurry pool is used to provide biogas slurry, anaerobic biogas slurry enters biogas slurry pool through centrifuge, and biogas slurry with temperature of 35 ℃ is provided;

[0007] Tubular heat exchanger is arranged between biogas slurry pool and heat pump, and is used to transfer the waste heat in biogas slurry pool to the circulating water of heat pump, so that the temperature of circulating water of heat pump evaporation is increased to 33 ℃, and the temperature of biogas slurry is reduced to 25 ℃;

[0008] Heat pump, the water temperature of circulating water of heat pump evaporation side is 33 ℃, and 65 ℃ hot water produced by condensing side is used to heat raw material pool water through plate heat exchanger, and the temperature of circulating water of evaporation side is reduced to 23 ℃ after evaporation, and is returned to tubular heat exchanger.

[0009] Plate heat exchanger is arranged between heat pump and raw material pool, and 65 ℃ hot water of condensing side of heat pump is used to transfer the heat of heat pump to raw material pool water, and hot water after heat transfer is returned to condensing side of heat pump.

[0010] Preferably, the model of the above-mentioned heat pump is 30XW0802H.

[0011] Preferably, the circulating water system of the evaporation side of the above-mentioned heat pump is a closed loop system, which avoids external pollution and ensures heat transfer efficiency.

[0012] Preferably, the model of the above-mentioned tubular heat exchanger is SSGLC-1.0-121-L.

[0013] Preferably, the model of the above-mentioned plate heat exchanger is UH15FW-1.6 / 135-90.

[0014] Heat transfer process: first, the biogas slurry exchanges heat with the circulating water of the heat pump evaporation side through the tube shell heat exchanger, and the biogas slurry temperature drops to 25℃, and the circulating water temperature rises to 33℃. Subsequently, after heat pump treatment, the water temperature of the heat pump condensing side rises to 65℃, and the 65℃ hot water produced is used to heat the raw material pool water through the plate heat exchanger, and the temperature of the heated hot water drops to 55℃, and is recycled to the heat pump condensing side, and the evaporation side circulating water temperature of the heat pump is kept at 33℃ to ensure the stable operation of the heat pump system. Advantages

[0015] The sewage source biogas slurry waste heat recovery system has the following advantages:

[0016] 1. Efficiently recover the waste heat in the biogas slurry, improve the energy utilization efficiency;

[0017] 2. Reduce the heating cost of the raw material pool, promote the sustainable development of the agricultural, breeding and other industries;

[0018] 3. The closed-loop designed intermediate circulating water system avoids external pollution and ensures the heat transfer efficiency; BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The system structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with the drawings. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.

[0021] A sewage source biogas slurry waste heat recovery system, comprising:

[0022] The biogas slurry pool is used to provide biogas slurry, and the anaerobic biogas slurry enters the biogas slurry pool through the centrifuge, and the biogas slurry with a temperature of 35℃ is provided;

[0023] The tube shell heat exchanger is arranged between the biogas slurry pool and the heat pump, and is used to transfer the waste heat in the biogas slurry pool to the circulating water of the heat pump, so that the temperature of the circulating water of the heat pump evaporation side rises to 33℃, and the biogas slurry temperature is reduced to 25℃;

[0024] The heat pump, the circulating water temperature of the heat pump evaporation side is 33℃, and the 65℃ hot water produced by the condensing side is used for heating the raw material pool water through the plate heat exchanger, and the circulating water of the evaporation side is reduced to 23℃ after evaporation, and is returned to the tube shell heat exchanger;

[0025] The plate heat exchanger is arranged between the heat pump and the raw material pool, receives the 65℃ hot water of the condensing side of the heat pump to transfer the heat of the heat pump to the raw material pool water, and the hot water after heat transfer is returned to the condensing side of the heat pump.

[0026] Preferably, the heat pump is of a model 30XW0802H.

[0027] Preferably, the circulating water system of the evaporation side of the heat pump is a closed loop system, avoiding external pollution and ensuring heat transfer efficiency.

[0028] Preferably, the shell-and-tube heat exchanger is of a model SSGLC-1.0-121-L.

[0029] Preferably, the plate heat exchanger is of a model UH15FW-1.6 / 135-90.

[0030] The heat transfer process is as follows: first, the biogas slurry exchanges heat with the circulating water of the evaporation side of the heat pump through the shell-and-tube heat exchanger, the temperature of the biogas slurry is reduced to 25℃, and the circulating water is heated to 33℃. Subsequently, the water temperature of the condensing side of the heat pump is raised to 65℃ after heat pump treatment, and the 65℃ hot water produced is used to transfer heat to the raw material pool water through the plate heat exchanger, the temperature of the heated hot water is reduced to 55℃, and is recovered to the condensing side of the heat pump for recycling, and the circulating water temperature of the evaporation side of the heat pump is maintained at 33℃ to ensure stable operation of the heat pump system. Embodiment

[0031] The waste heat of a certain project sewage source (biogas slurry) is recovered, the biogas slurry temperature is 35℃, and the output is 900t per day. The heat pump finally exchanges 65℃ hot water to heat the raw material pool, and the total heating capacity is 780kW, working about 18 hours a day.

[0032] Since the biogas slurry cannot be directly fed into the heat pump, a shell-and-tube heat exchanger is arranged in the middle to exchange heat from the 35℃ biogas slurry to the circulating water of the heat pump, the temperature of the exchanged biogas slurry is 25℃, and the circulating water temperature of the evaporation side of the heat pump is 33℃, and the 65℃ hot water produced by the condensing side is used to heat the raw material pool water through the plate heat exchanger.

[0033] The heat pump has a heating capacity of 50544MJ per day, and the heat is converted to 19.9 tons of steam (2MP saturated steam) per day, and the annual steam consumption is 7263.2 tons. The COP of the heat pump system is 4.2, the heat pump system consumes 1.22 million KWh per year, the steam price is 240 yuan / t, and the electricity price is 0.8 yuan / kwh. After calculation, the annual electricity fee after transformation is 793,000 yuan, the converted steam fee is 1,743,000 yuan, and the total energy saving fee is 950,000 yuan.

[0034] The static investment recovery period of the project is = the tax-included engineering cost / the annual income after transformation = 90.4 / 95 ≈ 1 year.

[0035] The following effects can be achieved by the biogas slurry waste heat recovery:

[0036] (1) The steam usage is saved by about 7263.2 t / year, the steam cost is saved by 1.743 million yuan, the electricity cost is 79.3 million yuan at the electricity price of 0.65 yuan / kwh, and the annual energy saving cost is 9.5 million yuan.

[0037] (2) The investment estimation of the project is about 0.904 million yuan, and the recovery period is about 1 year.

[0038] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the art, without departing from the technical principles of the present application, a number of improvements and deformations can be made, and these improvements and deformations should also be considered as the protection scope of the present application.

Claims

1. A sewage source biogas liquid waste heat recovery system, characterized in that, The application relates to a biogas slurry pool for providing biogas slurry, an anaerobic biogas slurry entering the biogas slurry pool through a centrifugal machine, and providing the biogas slurry with a temperature of 35 DEG C; a tubular heat exchanger arranged between the biogas slurry pool and a heat pump, and used for transferring the waste heat in the biogas slurry pool to circulating water of the heat pump, so that the temperature of the circulating water on the evaporation side of the heat pump is increased to 33 DEG C, and the temperature of the biogas slurry is reduced to 25 DEG C; the heat pump, the circulating water on the evaporation side of the heat pump being 33 DEG C, and 65 DEG C hot water produced on the condensation side of the heat pump being used for heating raw material pool water through a plate heat exchanger, and the circulating water on the evaporation side of the heat pump being reduced to 23 DEG C after evaporation and flowing back to the tubular heat exchanger; the plate heat exchanger arranged between the heat pump and the raw material pool, and receiving the 65 DEG C hot water on the condensation side of the heat pump for transferring the heat of the heat pump to the raw material pool water, and the hot water after heat transfer flowing back to the condensation side of the heat pump. The heat pump adopts a model of 30XW0802H. The circulating water system on the evaporation side of the heat pump is a closed loop system, external pollution is avoided, and heat transfer efficiency is ensured. The tubular heat exchanger adopts a model of SSGLC-1.0-121-L. The plate heat exchanger adopts a model of UH15FW-1.6 / 135-90.

2. The sewage source biogas liquid waste heat recovery system according to claim 1, characterized in that, ​ 3. The sewage source biogas liquid waste heat recovery system according to claim 1, characterized in that, ​ 4. The sewage source biogas liquid waste heat recovery system according to claim 1, characterized in that, ​ 5. The sewage source biogas liquid waste heat recovery system according to claim 1, characterized in that, ​

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